/* ============================================================
   ClashPage — zh-CN shared styles
   (homepage + download page + other pages)
   Color identity: deep indigo + cyan accent
   ============================================================ */

:root {
  --brand:       #6366f1;
  --brand-dim:   #4f52d4;
  --brand-glow:  rgba(99, 102, 241, 0.35);
  --cyan:        #06b6d4;
  --cyan-dim:    #0891b2;
  --green:       #10b981;
  --green-dim:   #059669;
  --amber:       #f59e0b;
  --red:         #ef4444;
  --text:        #f0f4ff;
  --text-2:      #94a3b8;
  --text-3:      #475569;
  --bg:          #06090f;
  --bg-1:        #0c1120;
  --bg-card:     #101828;
  --bg-card-2:   #131f33;
  --border:      rgba(255,255,255,0.07);
  --border-2:    rgba(255,255,255,0.13);
  --shadow-lg:   0 24px 64px rgba(0,0,0,0.6);
  --r:           12px;
  --r-sm:        8px;
  --hh:          68px;
  --container:   1140px;
  --ease:        0.2s ease;
  --font-head:   'Outfit', system-ui, sans-serif;
  --font-body:   'Source Sans 3', system-ui, sans-serif;
}

*,*::before,*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--cyan); text-decoration: none; transition: color var(--ease); }
a:hover { color: #67e8f9; }
strong { color: var(--text); }
code {
  font-family: ui-monospace, 'Cascadia Code', 'Fira Code', monospace;
  font-size: 0.9em;
  background: rgba(99,102,241,0.12);
  color: #a5b4fc;
  padding: 0.1em 0.4em;
  border-radius: 4px;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}


/* ──────────────────────────────────
   HEADER
   ────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--hh);
  background: rgba(6, 9, 15, 0.88);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

/* push all page content below the fixed header */
body { padding-top: var(--hh); }
.header-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  height: var(--hh);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  flex-shrink: 0;
}
.brand:hover { color: var(--text); }
.brand-accent { color: var(--brand); }
.brand-logo { border-radius: 8px; }

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 40px; height: 40px;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  background: var(--bg-card);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: border-color var(--ease);
}
.nav-toggle:hover { border-color: var(--border-2); }
.nav-toggle i { pointer-events: none; } /* let clicks pass through icon to button */

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: 2rem;
}
.nav-link {
  padding: 0.45rem 0.85rem;
  color: var(--text-2);
  font-weight: 500;
  font-size: 0.9rem;
  border-radius: var(--r-sm);
  transition: color var(--ease), background var(--ease);
}
.nav-link:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.nav-link.is-active { color: var(--brand); background: rgba(99,102,241,0.1); }
/* Mobile lang row — hidden on desktop, shown inside mobile drawer */
.nav-lang-row  { display: none; }
.nav-lang-item { display: none; }
.nav-lang-label { display: none; }

/* lang switcher */
.lang-switcher { position: relative; margin-left: auto; }
.lang-trigger {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}
.lang-trigger:hover { border-color: var(--border-2); color: var(--text); }
.lang-trigger .fa-chevron-down { font-size: 0.65rem; opacity: 0.6; }
.lang-menu {
  position: absolute;
  top: calc(100% + 8px); right: 0;
  min-width: 140px;
  padding: 0.3rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
}
.lang-switcher.is-open .lang-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.lang-item {
  display: block;
  padding: 0.45rem 0.7rem;
  color: var(--text-2);
  font-size: 0.85rem;
  border-radius: 6px;
  cursor: default;
  text-decoration: none;
}
a.lang-item {
  cursor: pointer;
  transition: color var(--ease), background var(--ease);
}
a.lang-item:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.lang-item.is-active { color: var(--brand); background: rgba(99,102,241,0.1); cursor: default; }


/* ──────────────────────────────────
   PAGE BG
   ────────────────────────────────── */
.page-bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 60% 50% at 0% 0%, rgba(99,102,241,0.14), transparent 55%),
    radial-gradient(ellipse 50% 40% at 100% 10%, rgba(6,182,212,0.10), transparent 55%),
    radial-gradient(ellipse 40% 40% at 50% 100%, rgba(16,185,129,0.06), transparent 55%),
    var(--bg);
}
.page-grid {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 90%);
}


/* ──────────────────────────────────
   HERO
   ────────────────────────────────── */
.hero {
  padding: 4rem 0 5rem;
  overflow: hidden;
}
.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

/* OS detect chip */
.os-detect {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem 0.35rem 0.55rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 999px;
  background: rgba(99,102,241,0.08);
  color: var(--text-2);
  font-size: 0.82rem;
  transition: border-color var(--ease);
}
.os-detect.detected { color: var(--brand); border-color: rgba(99,102,241,0.45); }
.os-detect i { color: var(--brand); font-size: 0.75rem; }

/* H1 */
.hero-h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 4.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}
.hero-h1 .hl-brand {
  background: linear-gradient(130deg, var(--brand), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin: 0 0 2rem;
  max-width: 31rem;
  color: var(--text-2);
  font-size: 1.05rem;
  line-height: 1.75;
}

/* Big download button */
.btn-dl {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 1.25rem 0.9rem 1rem;
  margin-bottom: 1.25rem;
  border-radius: var(--r);
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: #fff;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 8px 32px var(--brand-glow), inset 0 1px 0 rgba(255,255,255,0.15);
  transition: transform var(--ease), box-shadow var(--ease);
  max-width: 340px;
}
.btn-dl:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 14px 40px var(--brand-glow), inset 0 1px 0 rgba(255,255,255,0.15);
}
.btn-dl-icon {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.15);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.btn-dl-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.1rem;
  flex: 1;
  min-width: 0;
}
.btn-dl-main { font-size: 0.95rem; white-space: nowrap; }
.btn-dl-hint { font-size: 0.75rem; opacity: 0.75; font-weight: 400; font-family: var(--font-body); }
.btn-dl-arrow { margin-left: auto; opacity: 0.6; font-size: 0.85rem; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.1rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r);
  background: transparent;
  color: var(--text-2);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.btn-secondary:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.04);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-3);
  font-size: 0.8rem;
}
.pill i { color: var(--brand); font-size: 0.7rem; }

/* Topology SVG */
.topo-wrap {
  position: relative;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
}
.topo-wrap::before {
  content: '';
  position: absolute;
  inset: -40% -20%;
  background: radial-gradient(circle, rgba(99,102,241,0.12), transparent 65%);
  pointer-events: none;
  z-index: -1;
}
.topo-svg { width: 100%; height: auto; overflow: visible; }

/* ── Mobile SVG topology: vertical layout ── */
.topo-svg-mobile { display: none; }

/* Mobile packet animations (vertical paths) */
.topo-svg.animated .packet-direct-m {
  fill: var(--green);
  filter: drop-shadow(0 0 4px var(--green));
  offset-path: path('M 130 46 L 130 136 Q 100 192 62 258');
  animation: pkt-move 3.2s 0.2s linear infinite;
}
.topo-svg.animated .packet-proxy-m {
  fill: var(--cyan);
  filter: drop-shadow(0 0 4px var(--cyan));
  offset-path: path('M 130 46 L 130 136 Q 160 192 198 258');
  animation: pkt-move 3.2s 1.8s linear infinite;
}

/* SVG topology elements */
.topo-edge {
  fill: none;
  stroke: var(--border-2);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}
.topo-ppath { fill: none; stroke: none; }

.topo-node-ring {
  fill: none;
  stroke: var(--border-2);
  stroke-width: 1;
}
.topo-node-fill { fill: var(--bg-1); }
.clash-ring { stroke: rgba(99,102,241,0.5); }
.clash-fill { fill: rgba(99,102,241,0.15); }
.direct-ring { stroke: rgba(16,185,129,0.5); }
.direct-fill { fill: rgba(16,185,129,0.1); }
.proxy-ring { stroke: rgba(6,182,212,0.5); }
.proxy-fill { fill: rgba(6,182,212,0.1); }

.topo-node-icon {
  text-anchor: middle;
  font-size: 16px;
  dominant-baseline: middle;
}
.topo-node-label {
  text-anchor: middle;
  fill: var(--text-2);
  font-size: 10px;
  font-family: var(--font-body);
}
.topo-node-sublabel {
  text-anchor: middle;
  fill: var(--text-3);
  font-size: 9px;
  font-family: var(--font-body);
}

.edge-badge { fill: rgba(16,185,129,0.12); }
.proxy-badge { fill: rgba(6,182,212,0.12); }
.edge-badge-text {
  text-anchor: middle;
  fill: var(--green);
  font-size: 9px;
  font-family: ui-monospace, monospace;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.proxy-badge + .edge-badge-text,
.proxy-badge-text { fill: var(--cyan); }

/* Packet animation via offset-path */
.packet { opacity: 0; }
.topo-svg.animated .packet-direct {
  fill: var(--green);
  filter: drop-shadow(0 0 4px var(--green));
  offset-path: path('M 60 150 L 200 150 Q 290 150 380 80');
  animation: pkt-move 3.2s 0.2s linear infinite;
}
.topo-svg.animated .packet-proxy {
  fill: var(--cyan);
  filter: drop-shadow(0 0 4px var(--cyan));
  offset-path: path('M 60 150 L 200 150 Q 290 150 380 220');
  animation: pkt-move 3.2s 1.8s linear infinite;
}
@keyframes pkt-move {
  0%   { offset-distance: 0%;   opacity: 0; }
  6%   { opacity: 0.9; }
  94%  { opacity: 0.9; }
  100% { offset-distance: 100%; opacity: 0; }
}

/* Clash node pulse */
.topo-svg.animated .clash-ring {
  animation: ring-pulse 2.5s ease-in-out infinite;
}
@keyframes ring-pulse {
  0%, 100% { stroke-opacity: 0.5; r: 32; }
  50%       { stroke-opacity: 1;   r: 36; }
}


/* ──────────────────────────────────
   PROTOCOL TICKER
   ────────────────────────────────── */
.proto-ticker {
  padding: 0.9rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-1);
  overflow: hidden;
}
.ticker-inner {
  position: relative;
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, black 12%, black 88%, transparent);
}
.ticker-track {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: max-content;
  animation: ticker-scroll 28s linear infinite;
}
.ticker-track span {
  white-space: nowrap;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: ui-monospace, monospace;
  color: var(--text-3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.ticker-track .sep { color: var(--border-2); }
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}


/* ──────────────────────────────────
   SECTION HEADER COMMON
   ────────────────────────────────── */
.section { padding: 5.5rem 0; }
.sec-head { text-align: center; margin-bottom: 3rem; }
.sec-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  color: var(--brand);
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.sec-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-head);
  font-size: clamp(1.65rem, 2.8vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}
.sec-desc {
  margin: 0 auto;
  max-width: 36rem;
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.75;
}


/* ──────────────────────────────────
   RULE SIMULATOR
   ────────────────────────────────── */
.rule-demo {
  background: linear-gradient(180deg, transparent, rgba(12,17,32,0.7) 20%, rgba(12,17,32,0.7) 80%, transparent);
}

.sim-wrap {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 1.5rem;
  align-items: start;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
}

/* Examples column */
.sim-hint {
  margin: 0 0 0.85rem;
  color: var(--text-3);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}
.sim-examples {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-right: 1.5rem;
  border-right: 1px solid var(--border);
}
.sim-domain {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  cursor: pointer;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
  text-align: left;
}
.sim-domain:hover {
  border-color: var(--border-2);
  background: var(--bg-card-2);
  transform: translateX(3px);
}
.sim-domain.is-active {
  border-color: var(--brand);
  background: rgba(99,102,241,0.08);
}
.domain-name {
  font-family: ui-monospace, monospace;
  font-size: 0.88rem;
  color: var(--text);
}
.domain-tag {
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  flex-shrink: 0;
}
.proxy-tag { background: rgba(99,102,241,0.15); color: #a5b4fc; }
.direct-tag { background: rgba(16,185,129,0.12); color: #6ee7b7; }

/* Pipeline column */
.sim-pipeline { padding: 0.25rem 0 0 0.25rem; }

.sim-request {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  margin-bottom: 0.75rem;
}
.sim-request-label {
  font-size: 0.75rem;
  color: var(--text-3);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.sim-domain-display {
  font-size: 0.95rem;
  color: var(--cyan);
  background: transparent;
  padding: 0;
}

.sim-arrow-down {
  text-align: center;
  margin: 0.4rem 0;
  color: var(--text-3);
  font-size: 0.85rem;
}

/* Individual rules */
.sim-rules { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 0.75rem; }
.sim-rule {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}
.rule-index {
  font-size: 0.7rem;
  color: var(--text-3);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  flex-shrink: 0;
  min-width: 2.5rem;
}
.rule-body {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex: 1;
  min-width: 0;
  flex-wrap: wrap;
}
.rule-type {
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--amber);
  font-weight: 600;
}
.rule-val {
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--text);
}
.rule-action {
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--text-3);
}
.rule-status {
  font-size: 0.78rem;
  font-weight: 600;
  min-width: 4rem;
  text-align: right;
}

/* Rule states */
.sim-rule.rule-active {
  border-color: rgba(99,102,241,0.4);
  background: rgba(99,102,241,0.06);
  transform: translateX(4px);
}
.sim-rule.rule-match {
  border-color: rgba(16,185,129,0.5);
  background: rgba(16,185,129,0.07);
}
.sim-rule.rule-match .rule-status { color: var(--green); }
.sim-rule.rule-skip { opacity: 0.4; }
.sim-rule.rule-skip .rule-status { color: var(--red); }

/* Result box */
.sim-result-wrap {
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  min-height: 52px;
  transition: border-color var(--ease), background var(--ease);
}
.sim-result-inner {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text-3);
  font-size: 0.9rem;
}
.sim-result-icon {
  display: flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: var(--r-sm);
  background: var(--bg-card);
  font-size: 0.9rem;
  flex-shrink: 0;
}
.sim-result-wrap.show-proxy {
  border-color: rgba(99,102,241,0.45);
  background: rgba(99,102,241,0.07);
}
.sim-result-wrap.show-proxy .sim-result-inner { color: var(--text); }
.sim-result-wrap.show-proxy .sim-result-icon {
  background: rgba(99,102,241,0.2);
  color: var(--brand);
}
.sim-result-wrap.show-direct {
  border-color: rgba(16,185,129,0.45);
  background: rgba(16,185,129,0.07);
}
.sim-result-wrap.show-direct .sim-result-inner { color: var(--text); }
.sim-result-wrap.show-direct .sim-result-icon {
  background: rgba(16,185,129,0.2);
  color: var(--green);
}


/* ──────────────────────────────────
   CLIENT TABS + CARDS
   ────────────────────────────────── */
.client-section { background: var(--bg-1); }

.os-tabs {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
  padding: 0.35rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  width: fit-content;
  margin-inline: auto;
}
.os-tab {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1.1rem;
  border: none;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--ease), background var(--ease);
}
.os-tab:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.os-tab.active,
.os-tab.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  box-shadow: 0 2px 12px var(--brand-glow);
}
.os-tab.active i,
.os-tab.is-active i { color: #fff; }

.client-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.client-card {
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  transition: border-color var(--ease), transform var(--ease);
}
.client-card:hover {
  border-color: var(--border-2);
  transform: translateY(-3px);
}
.client-card.featured { border-color: rgba(99,102,241,0.3); }

.client-card-head { margin-bottom: 0.85rem; }
.client-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
}
.badge-rec  { background: rgba(99,102,241,0.15); color: #a5b4fc; border: 1px solid rgba(99,102,241,0.25); }
.badge-adv  { background: rgba(245,158,11,0.12); color: #fcd34d; border: 1px solid rgba(245,158,11,0.2); }
.badge-lite { background: rgba(16,185,129,0.12); color: #6ee7b7; border: 1px solid rgba(16,185,129,0.2); }
.badge-alt    { background: rgba(255,255,255,0.05); color: var(--text-3);  border: 1px solid var(--border); }
.badge-legacy { background: rgba(239,68,68,0.1);  color: #fca5a5;         border: 1px solid rgba(239,68,68,0.2); }

/* Scroll-reveal */
.reveal-up {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.client-name {
  margin: 0 0 0.25rem;
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
}
.client-for {
  margin: 0;
  color: var(--text-3);
  font-size: 0.83rem;
}

.client-desc {
  margin: 0 0 1rem;
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.65;
}

.client-features {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.client-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-2);
  font-size: 0.875rem;
}
.client-features i { color: var(--green); font-size: 0.75rem; flex-shrink: 0; }

.client-actions { display: flex; gap: 0.65rem; flex-wrap: wrap; }
.btn-dl-sm {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.05rem;
  border-radius: var(--r-sm);
  background: var(--brand);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-head);
  transition: background var(--ease), transform var(--ease);
}
.btn-dl-sm:hover { color: #fff; background: var(--brand-dim); transform: translateY(-1px); }
.btn-dl-sm-ghost {
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--text-2);
}
.btn-dl-sm-ghost:hover { color: var(--text); background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.2); transform: translateY(-1px); }
.btn-ghost-sm {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.05rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--text-2);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--ease), border-color var(--ease);
}
.btn-ghost-sm:hover { color: var(--text); border-color: rgba(255,255,255,0.2); }


/* ──────────────────────────────────
   FAQ
   ────────────────────────────────── */
.faq-list {
  max-width: 760px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color var(--ease);
  margin-bottom: 0.6rem;
}
.faq-item.open { border-color: var(--border-2); }

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.975rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: color var(--ease);
}
.faq-q:hover { color: var(--brand); }
.faq-chevron {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--text-3);
  transition: transform var(--ease);
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }

.faq-a {
  padding: 0 1.25rem 1.1rem;
}
.faq-a p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.93rem;
  line-height: 1.75;
}
.faq-a a { color: var(--cyan); }
.faq-a a:hover { color: #67e8f9; }


/* ──────────────────────────────────
   FOOTER
   ────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-1);
  padding: 3.5rem 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
}
.footer-desc {
  margin: 0.85rem 0 0;
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 20rem;
}
.footer-heading {
  margin: 0 0 0.9rem;
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a { color: var(--text-2); font-size: 0.875rem; }
.footer-links a:hover { color: var(--brand); }
.site-footer .lang-switcher { margin-left: 0; }
/* Disclaimer bar */
.footer-disclaimer {
  padding: 1.25rem 0;
  border-top: 1px solid var(--border);
}
.disclaimer-text {
  margin: 0;
  color: var(--text-3);
  font-size: 0.78rem;
  line-height: 1.7;
}
.disclaimer-text strong {
  color: var(--text-2);
  font-weight: 600;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0 1.5rem;
  flex-wrap: wrap;
}
.copyright { margin: 0; color: var(--text-3); font-size: 0.82rem; }
.footer-legal {
  margin: 0;
  color: var(--text-3);
  font-size: 0.78rem;
}
.footer-legal a { color: var(--text-3); transition: color var(--ease); }
.footer-legal a:hover { color: var(--text-2); }
.footer-github {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-2);
  font-size: 0.875rem;
  font-weight: 500;
}
.footer-github:hover { color: var(--brand); }


/* ──────────────────────────────────
   SCROLL REVEAL
   ────────────────────────────────── */
.reveal-target {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.reveal-target.revealed { opacity: 1; transform: none; }


/* ──────────────────────────────────
   RESPONSIVE
   ────────────────────────────────── */
@media (max-width: 1024px) {
  .hero-layout { grid-template-columns: 1fr; }
  .hero-visual { max-width: 480px; margin-inline: auto; order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  .site-nav {
    position: fixed;
    top: var(--hh); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    margin: 0; padding: 0.75rem;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    opacity: 0; visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
  }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-link { padding: 0.75rem 1rem; }
  .header-inner .lang-switcher { display: none; }
  .lang-switcher { margin-left: 0; }

  /* Language row inside mobile drawer — override the desktop hide */
  .nav-lang-row, .nav-lang-item, .nav-lang-label { display: revert; }
  .nav-lang-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 0.5rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-1);
    margin-top: 0.25rem;
  }
  .nav-lang-label {
    font-size: 0.75rem;
    color: var(--text-3);
    width: 100%;
    margin-bottom: 0.25rem;
  }
  .nav-lang-item {
    font-size: 0.8rem;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    border: 1px solid var(--border-1);
    color: var(--text-2);
    text-decoration: none;
    transition: color var(--ease), border-color var(--ease), background var(--ease);
  }
  .nav-lang-item:hover  { color: var(--text); border-color: var(--border-2); }
  .nav-lang-item.is-active {
    color: var(--brand);
    border-color: var(--brand);
    background: rgba(99,102,241,0.08);
  }

  .sim-wrap {
    grid-template-columns: 1fr;
    padding: 1.25rem;
  }
  .sim-examples {
    padding-right: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  .client-cards { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }

  .os-tabs { width: 100%; justify-content: center; }
  .os-tab { flex: 1; justify-content: center; min-width: 0; }
  .os-tab span { display: none; }
}

@media (max-width: 480px) {
  .hero-h1 { font-size: 2.2rem; }
  .btn-dl { max-width: 100%; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn-secondary { justify-content: center; }
  .sim-examples { grid-template-columns: 1fr; }
}


/* ============================================================
   DOWNLOAD PAGE  (complete redesign)
   ============================================================ */

/* Page hero (compact) */
.page-hero {
  padding: 3.5rem 0 3rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.page-hero .os-detect { justify-content: center; margin-bottom: 1rem; }
.page-hero-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-head);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.page-hero-title .hl-brand {
  background: linear-gradient(130deg, var(--brand), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-hero-desc {
  margin: 0 auto;
  max-width: 28rem;
  color: var(--text-2);
  font-size: 1rem;
}

/* Sticky platform tabs bar */
.dl-tabs-bar {
  position: sticky;
  top: var(--hh);
  z-index: 90;
  background: rgba(6, 9, 15, 0.94);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 0;
}
.dl-tabs-bar .os-tabs {
  width: fit-content;
  margin-inline: auto;
  background: var(--bg-1);
}

/* Download content */
.dl-content { padding: 3rem 0 5rem; }
.dl-panel { display: none; }
.dl-panel.is-active { display: block; }

/* ── Featured card (big hero card) ── */
.dl-feat {
  position: relative;
  overflow: hidden;
  padding: 2.25rem 2rem;
  border: 1px solid rgba(99,102,241,0.4);
  border-radius: calc(var(--r) + 2px);
  background:
    linear-gradient(135deg, rgba(99,102,241,0.13) 0%, rgba(6,9,15,0) 55%),
    var(--bg-card);
  margin-bottom: 1rem;
}

/* Large decorative icon, top-right */
.dl-feat-deco {
  position: absolute;
  top: -0.5rem;
  right: 1.5rem;
  font-size: 9rem;
  color: var(--brand);
  opacity: 0.055;
  pointer-events: none;
  line-height: 1;
}

/* Inner layout: info left · download right */
.dl-feat-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem;
  align-items: start;
  position: relative;
}

.dl-feat-badge { margin-bottom: 0.6rem; }

.dl-feat-name {
  margin: 0 0 0.3rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.dl-feat-tagline {
  margin: 0 0 1rem;
  color: var(--text-3);
  font-size: 0.88rem;
}

.dl-feat-desc {
  margin: 0 0 1.25rem;
  max-width: 40rem;
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Requirements inline chips */
.dl-reqs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0;
}
.dl-req-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.03);
  color: var(--text-3);
  font-size: 0.77rem;
}
.dl-req-chip i { font-size: 0.68rem; color: var(--cyan); }

/* Download actions column */
.dl-feat-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-width: 220px;
  padding-top: 0.25rem;
}

/* Primary download button (large) */
.btn-dl-primary {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.4rem;
  border-radius: var(--r);
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
  box-shadow: 0 8px 32px var(--brand-glow);
  transition: transform var(--ease), box-shadow var(--ease);
}
.btn-dl-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 14px 40px var(--brand-glow);
}
.btn-dl-primary-ico {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.18);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.btn-dl-primary-text {
  display: flex;
  flex-direction: column;
  gap: 0.08rem;
}
.btn-dl-primary-main { font-size: 0.95rem; }
.btn-dl-primary-sub  { font-size: 0.72rem; opacity: 0.72; font-weight: 400; font-family: var(--font-body); }

/* Secondary / outline button */
.btn-dl-sec {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r);
  background: rgba(255,255,255,0.03);
  color: var(--text-2);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.btn-dl-sec:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.06);
}

/* Tutorial link in actions */
.btn-dl-tutorial {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem;
  color: var(--text-3);
  font-size: 0.82rem;
  border-radius: var(--r-sm);
  transition: color var(--ease);
}
.btn-dl-tutorial:hover { color: var(--cyan); }

/* ── Secondary (alternative) card ── */
.dl-alt {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.1rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  margin-bottom: 0.65rem;
  transition: border-color var(--ease);
}
.dl-alt:hover { border-color: var(--border-2); }

.dl-alt-info { flex: 1; min-width: 0; }
.dl-alt-name {
  margin: 0 0 0.2rem;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.dl-alt-desc {
  margin: 0;
  color: var(--text-3);
  font-size: 0.85rem;
  line-height: 1.5;
}

.dl-alt-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--text-2);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.dl-alt-btn:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.04);
}
.dl-alt-btns {
  display: flex;
  gap: 0.4rem;
  flex-shrink: 0;
  flex-wrap: wrap;
}

/* App Store button */
.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.3rem;
  border-radius: var(--r);
  background: var(--bg-1);
  border: 1px solid var(--border-2);
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.9rem;
  transition: border-color var(--ease), transform var(--ease);
}
.btn-appstore:hover { color: var(--text); border-color: var(--brand); transform: translateY(-2px); }
.btn-appstore-icon { font-size: 1.8rem; color: var(--brand); }
.btn-appstore-text { display: flex; flex-direction: column; gap: 0.06rem; }
.btn-appstore-sub  { font-size: 0.68rem; color: var(--text-3); font-weight: 400; font-family: var(--font-body); }
.btn-appstore-name { font-size: 0.9rem; }

/* Advanced / details accordion */
.dl-advanced {
  margin-top: 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  overflow: hidden;
}
.dl-advanced-toggle {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.25rem;
  color: var(--text-3);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  transition: color var(--ease);
}
.dl-advanced-toggle:hover { color: var(--text-2); }
.dl-advanced-toggle .chev {
  margin-left: auto;
  font-size: 0.65rem;
  opacity: 0.5;
  transition: transform var(--ease);
}
.dl-advanced[open] .chev { transform: rotate(180deg); }
.dl-advanced-body {
  padding: 0.5rem 1.25rem 1.1rem;
  border-top: 1px solid var(--border);
}
.dl-advanced-body p {
  margin: 0.6rem 0 0.85rem;
  color: var(--text-2);
  font-size: 0.875rem;
}
.dl-advanced-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.btn-dl-mono {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-1);
  color: var(--text-3);
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  transition: color var(--ease), border-color var(--ease);
}
.btn-dl-mono:hover { color: var(--text); border-color: var(--border-2); }

/* Safety notice */
.dl-notice {
  margin-top: 2.5rem;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--r);
  background: rgba(245,158,11,0.04);
}
.dl-notice-icon { flex-shrink: 0; color: var(--amber); font-size: 0.95rem; margin-top: 0.15rem; }
.dl-notice p { margin: 0; color: var(--text-2); font-size: 0.875rem; line-height: 1.7; }
.dl-notice strong { color: var(--text); }
.dl-notice a { color: var(--cyan); }

/* ── Official website showcase card ── */
.dl-site-card {
  display: block;
  margin-bottom: 1rem;
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: var(--r);
  overflow: hidden;
  background: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(6,9,15,0) 60%), var(--bg-card);
  text-decoration: none;
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.dl-site-card:hover {
  border-color: rgba(99,102,241,0.6);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(99,102,241,0.15);
}

/* Fake browser bar */
.dl-site-card-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: rgba(0,0,0,0.25);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.dl-site-bar-dots {
  display: flex;
  gap: 5px;
  flex-shrink: 0;
}
.dl-site-bar-dots i {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
}
.dl-site-bar-dots i:nth-child(1) { background: #ff5f57; }
.dl-site-bar-dots i:nth-child(2) { background: #febc2e; }
.dl-site-bar-dots i:nth-child(3) { background: #28c840; }

.dl-site-bar-url {
  flex: 1;
  text-align: center;
  padding: 0.28rem 1rem;
  border-radius: 6px;
  background: rgba(255,255,255,0.06);
  color: var(--text-2);
  font-size: 0.88rem;
  font-family: ui-monospace, monospace;
  letter-spacing: 0.01em;
}
.dl-site-bar-url i {
  color: var(--green);
  font-size: 0.7rem;
  margin-right: 0.3rem;
}
.dl-site-bar-visit {
  flex-shrink: 0;
  color: var(--brand);
  font-size: 0.8rem;
  font-weight: 600;
}

/* Card body */
.dl-site-card-body {
  padding: 1.25rem 1.5rem 1.4rem;
}
.dl-site-card-tagline {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.dl-site-card-pills {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 2rem;
}
.dl-site-card-pills li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-2);
  font-size: 0.875rem;
}
.dl-site-card-pills li i {
  color: var(--green);
  font-size: 0.72rem;
  flex-shrink: 0;
}

@media (max-width: 540px) {
  .dl-site-card-pills { grid-template-columns: 1fr; }
}

/* iOS note */
.dl-ios-note {
  margin-top: 1rem;
  padding: 0.85rem 1.1rem;
  border: 1px solid rgba(6,182,212,0.2);
  border-radius: var(--r);
  background: rgba(6,182,212,0.04);
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.65;
}
.dl-ios-note strong { color: var(--cyan); }

/* Responsive */
@media (max-width: 960px) {
  .dl-feat-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .dl-feat-actions {
    flex-direction: row;
    flex-wrap: wrap;
    min-width: 0;
    padding-top: 0;
  }
  .btn-dl-primary { flex: 1; min-width: 200px; }
}
@media (max-width: 768px) {
  .dl-tabs-bar .os-tabs { width: 100%; border-radius: 0; border: none; background: transparent; padding: 0; }
  .dl-tabs-bar .os-tab  { flex: 1; justify-content: center; min-width: 0; border-radius: var(--r-sm); }
  .dl-tabs-bar .os-tab span { display: none; }
  .dl-alt { flex-wrap: wrap; }
  .dl-feat { padding: 1.25rem; }
  .dl-feat-deco { display: none; }
  .dl-feat-name { font-size: 1.35rem; }
  .dl-feat-desc { font-size: 0.875rem; line-height: 1.6; margin-bottom: 0.9rem; }
  .dl-feat-tagline { margin-bottom: 0.65rem; }
  .dl-feat-badge { margin-bottom: 0.4rem; }
  .btn-dl-primary { padding: 0.8rem 1.1rem; }
  .btn-dl-primary-ico { width: 32px; height: 32px; font-size: 0.95rem; }
  .btn-dl-sec { padding: 0.6rem 0.85rem; }
}
@media (max-width: 480px) {
  .dl-feat { padding: 1rem; }
  .dl-feat-name { font-size: 1.2rem; }
  .dl-feat-desc { display: none; }           /* hide long description, keep chips */
  .dl-feat-actions { flex-direction: column; }
  .btn-dl-primary  { width: 100%; }
}


/* ============================================================
   TUTORIAL PAGE – Article Layout
   ============================================================ */

/* Two-column layout */
.art-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  gap: 4rem;
  align-items: start;
}

/* ── Sidebar TOC ── */
.art-toc {
  position: sticky;
  top: calc(var(--hh) + 1.5rem);
}
.art-toc-title {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.art-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  counter-reset: toc-counter;
}
.art-toc-list > li { counter-increment: toc-counter; }
.art-toc-sub {
  list-style: none;
  margin: 0.1rem 0 0.25rem 0.9rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  border-left: 1px solid var(--border);
}
.art-toc-sub .art-toc-link { padding-left: 0.75rem; font-size: 0.8rem; }
.art-toc-link {
  display: block;
  padding: 0.32rem 0.5rem;
  border-radius: 4px;
  color: var(--text-3);
  font-size: 0.84rem;
  line-height: 1.4;
  transition: color var(--ease), background var(--ease);
  text-decoration: none;
}
.art-toc-link:hover { color: var(--text-2); background: rgba(255,255,255,0.04); }
.art-toc-link.is-active { color: var(--brand); background: rgba(99,102,241,0.08); font-weight: 600; }
.art-toc-meta {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  color: var(--text-3);
  font-size: 0.78rem;
}
.art-toc-meta i { margin-right: 0.3rem; }

/* ── Article body ── */
.art-body {
  min-width: 0;
  overflow-x: hidden; /* prevent wide tables from blowing out the page */
  color: var(--text-2);
  font-size: 0.975rem;
  line-height: 1.8;
}

/* Article header */
.art-header { margin-bottom: 2.5rem; }
.art-header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}
.art-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: rgba(99,102,241,0.12);
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid rgba(99,102,241,0.2);
}
.art-reading-time {
  color: var(--text-3);
  font-size: 0.82rem;
}
.art-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 2.5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.2;
}
.art-subtitle {
  margin: 0 0 1.5rem;
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.7;
}
.art-dl-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.art-dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  font-family: var(--font-head);
  box-shadow: 0 4px 16px var(--brand-glow);
  transition: transform var(--ease), box-shadow var(--ease);
}
.art-dl-btn:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 6px 24px var(--brand-glow); }
.art-dl-hint { color: var(--text-3); font-size: 0.8rem; }

.art-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 0 2.5rem;
}

/* ── Sections ── */
.art-section {
  margin-bottom: 3rem;
  scroll-margin-top: calc(var(--hh) + 1.5rem);
}
.art-section h2 {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.art-section h2 .fa-brands { font-size: 1.1rem; margin-right: 0.2rem; opacity: 0.85; }
.art-section h3 {
  margin: 1.5rem 0 0.6rem;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.art-section p { margin: 0 0 0.85rem; }
.art-section p:last-child { margin-bottom: 0; }
.art-section a { color: var(--cyan); }
.art-section a:hover { color: #67e8f9; }
.art-section ul, .art-section ol { padding-left: 1.5rem; margin: 0 0 0.85rem; }
.art-section li { margin-bottom: 0.4rem; }
.art-section code {
  font-size: 0.84rem;
  color: var(--cyan);
  background: rgba(6,182,212,0.1);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-family: ui-monospace, monospace;
}

/* Numbered steps with custom styling */
.art-steps { list-style: none; padding: 0; margin: 0 0 0.85rem; counter-reset: art-step; }
.art-steps > li {
  counter-increment: art-step;
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.art-steps > li:last-child { border-bottom: none; }
.art-steps > li::before {
  content: counter(art-step);
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: #fff;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.78rem;
  margin-top: 0.15rem;
  box-shadow: 0 2px 8px var(--brand-glow);
}
.art-steps > li > strong { display: block; margin-bottom: 0.35rem; color: var(--text); font-size: 0.975rem; }
.art-steps > li > p { margin: 0; }

/* Callout boxes */
.art-callout {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  line-height: 1.65;
  margin: 0.9rem 0;
}
.art-callout > i { flex-shrink: 0; margin-top: 0.2rem; font-size: 0.85rem; }
.art-callout-info    { background: rgba(6,182,212,0.07);   border: 1px solid rgba(6,182,212,0.2);   color: var(--text-2); }
.art-callout-info > i  { color: var(--cyan); }
.art-callout-warn    { background: rgba(245,158,11,0.07);  border: 1px solid rgba(245,158,11,0.2);  color: var(--text-2); }
.art-callout-warn > i  { color: var(--amber); }
.art-callout-success { background: rgba(16,185,129,0.07);  border: 1px solid rgba(16,185,129,0.2);  color: var(--text-2); }
.art-callout-success > i { color: var(--green); }
.art-callout a { color: var(--cyan); }

/* Code blocks */
.art-code-block {
  margin: 0.9rem 0;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: rgba(0,0,0,0.4);
}
.art-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.85rem;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--border);
}
.art-code-header span {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.art-code-copy {
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-3);
  font-size: 0.72rem;
  cursor: pointer;
  transition: color var(--ease), background var(--ease);
}
.art-code-copy:hover { color: var(--text); background: rgba(255,255,255,0.08); }
.art-code-copy.copied { color: var(--green); border-color: rgba(16,185,129,0.3); }
.art-code-block pre {
  margin: 0;
  padding: 1rem 0 1rem 1.1rem;
  overflow-x: auto;
}
.art-code-block code {
  display: inline-block;   /* expands to fit content width, not just parent width */
  min-width: 100%;         /* at least fill the pre when content is short */
  padding-right: 1.1rem;   /* now this padding follows the last character */
  color: #86efac;
  font-family: ui-monospace, 'Cascadia Code', monospace;
  font-size: 0.82rem;
  line-height: 1.7;
  background: none;
  border-radius: 0;
}

/* App Store button */
.art-appstore-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.85rem 0;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r);
  background: var(--bg-card);
  color: var(--text);
  transition: border-color var(--ease), transform var(--ease);
}
.art-appstore-btn:hover { color: var(--text); border-color: var(--brand); transform: translateY(-2px); }
.art-appstore-btn i { font-size: 1.8rem; color: var(--brand); }
.art-appstore-btn span { display: flex; flex-direction: column; }
.art-appstore-btn small { font-size: 0.68rem; color: var(--text-3); }
.art-appstore-btn strong { font-size: 0.95rem; font-family: var(--font-head); }

/* Mode cards */
.art-mode-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin: 1rem 0;
}
.art-mode-card {
  padding: 1rem 1.1rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
}
.art-mode-card p { margin: 0.4rem 0 0; font-size: 0.84rem; line-height: 1.6; }
.art-mode-label {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 800;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}
.art-mode-label span { font-size: 0.75rem; font-weight: 600; color: var(--text-3); }
.art-mode-rule   { border-color: rgba(16,185,129,0.25); background: rgba(16,185,129,0.05); }
.art-mode-rule .art-mode-label { color: var(--green); }
.art-mode-global { border-color: rgba(245,158,11,0.25); background: rgba(245,158,11,0.05); }
.art-mode-global .art-mode-label { color: var(--amber); }
.art-mode-direct { border-color: var(--border); background: rgba(255,255,255,0.02); }
.art-mode-direct .art-mode-label { color: var(--text-3); }

/* Tables — both usage patterns:
   1. <div class="art-rule-table-wrap"><table class="art-table">  (tutorial)
   2. <div class="art-table"><table>                              (blog articles) */
.art-rule-table-wrap,
div.art-table {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0.85rem 0;
}
/* When art-table is the wrapper div, style the inner table */
div.art-table > table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.875rem;
}
div.art-table > table th,
div.art-table > table td {
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}
div.art-table > table th:last-child,
div.art-table > table td:last-child { white-space: normal; min-width: 130px; }
div.art-table > table th { background: rgba(255,255,255,0.04); color: var(--text-2); font-weight: 600; font-size: 0.8rem; }
div.art-table > table td { color: var(--text-2); }
div.art-table > table td code { font-size: 0.78rem; color: var(--cyan); background: rgba(6,182,212,0.1); padding: 0.1rem 0.3rem; border-radius: 3px; }

/* When art-table is the table element itself (tutorial) */
table.art-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: 0.875rem;
}
table.art-table th, table.art-table td {
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}
table.art-table th:last-child,
table.art-table td:last-child { white-space: normal; min-width: 130px; }
table.art-table th { background: rgba(255,255,255,0.04); color: var(--text-2); font-weight: 600; font-size: 0.8rem; }
table.art-table td { color: var(--text-2); }
table.art-table td code { font-size: 0.78rem; color: var(--cyan); background: rgba(6,182,212,0.1); padding: 0.1rem 0.3rem; border-radius: 3px; }

/* Article footer nav */
.art-footer-nav {
  display: flex;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.art-fnav-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  color: var(--text);
  transition: border-color var(--ease), background var(--ease);
}
.art-fnav-btn:hover { color: var(--text); border-color: var(--brand); background: rgba(99,102,241,0.06); }
.art-fnav-btn i { font-size: 1.2rem; color: var(--brand); flex-shrink: 0; }
.art-fnav-btn span { display: flex; flex-direction: column; gap: 0.1rem; }
.art-fnav-btn small { font-size: 0.72rem; color: var(--text-3); }
.art-fnav-sec i { color: var(--cyan); }

/* ── Breadcrumb ── */
.art-breadcrumb {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.75rem 2rem 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-3);
  flex-wrap: wrap;
}
.art-breadcrumb a {
  color: var(--text-3);
  transition: color var(--ease);
}
.art-breadcrumb a:hover { color: var(--brand); }
.art-breadcrumb-sep { opacity: 0.45; }
.art-breadcrumb-current { color: var(--text-2); }

/* ── End-of-article download CTA ── */
.art-end-cta {
  margin-top: 3rem;
  border-radius: var(--r);
  background: linear-gradient(135deg, rgba(99,102,241,0.12) 0%, rgba(6,182,212,0.08) 100%);
  border: 1px solid rgba(99,102,241,0.25);
  padding: 2rem 2.25rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.art-end-cta-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--r-sm);
  object-fit: contain;
  flex-shrink: 0;
}
.art-end-cta-body { flex: 1; min-width: 180px; }
.art-end-cta-title {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.3rem;
}
.art-end-cta-desc {
  font-size: 0.88rem;
  color: var(--text-2);
  margin: 0 0 1rem;
  line-height: 1.55;
}
.art-end-cta-btns {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.art-end-cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  font-family: var(--font-head);
  box-shadow: 0 4px 16px var(--brand-glow);
  transition: transform var(--ease), box-shadow var(--ease);
}
.art-end-cta-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 6px 24px var(--brand-glow); }
.art-end-cta-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--r-sm);
  border: 1px solid rgba(99,102,241,0.35);
  color: var(--brand);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-head);
  transition: background var(--ease), border-color var(--ease);
}
.art-end-cta-ghost:hover { color: var(--brand); background: rgba(99,102,241,0.08); border-color: var(--brand); }

/* ── Floating download card ── */
.art-float-card {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 200;
  width: 238px;
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--r);
  box-shadow: 0 6px 32px rgba(0,0,0,0.4);
  overflow: hidden;
  transform: translateX(calc(100% + 2.5rem));
  transition: transform 0.35s cubic-bezier(0.34,1.2,0.64,1);
}
.art-float-card.is-visible {
  transform: translateX(0);
}
.art-float-card-head {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.7rem 0.85rem;
  background: linear-gradient(135deg, rgba(99,102,241,0.13), rgba(6,182,212,0.07));
  border-bottom: 1px solid var(--border);
}
.art-float-card-icon {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  object-fit: contain;
  flex-shrink: 0;
}
.art-float-card-label {
  flex: 1;
  font-family: var(--font-head);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text);
}
.art-float-card-x {
  background: none;
  border: none;
  color: var(--text-3);
  font-size: 0.82rem;
  line-height: 1;
  padding: 0.2rem 0.25rem;
  border-radius: 4px;
  cursor: pointer;
  transition: color var(--ease), background var(--ease);
}
.art-float-card-x:hover { color: var(--text); background: rgba(255,255,255,0.07); }
.art-float-card-body { padding: 0.85rem; }
.art-float-card-sub {
  font-size: 0.76rem;
  color: var(--text-3);
  line-height: 1.45;
  margin: 0 0 0.8rem;
}
.art-float-card-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  width: 100%;
  padding: 0.55rem;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: var(--font-head);
  transition: opacity var(--ease);
  margin-bottom: 0.45rem;
}
.art-float-card-btn:hover { color: #fff; opacity: 0.88; }
.art-float-card-link {
  display: block;
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-3);
  transition: color var(--ease);
}
.art-float-card-link:hover { color: var(--brand); }

/* Responsive */
@media (max-width: 900px) {
  .art-layout { grid-template-columns: 1fr; gap: 0; padding: 1.5rem 1.25rem 4rem; }
  .art-toc { position: static; display: none; } /* hide on mobile */
  .art-mode-cards { grid-template-columns: 1fr; }
  .art-breadcrumb { padding: 0.75rem 1.25rem 0; }
}
@media (max-width: 540px) {
  .art-footer-nav { flex-direction: column; }
  .art-steps > li { flex-direction: column; gap: 0.5rem; }
  .art-float-card { bottom: 1.25rem; right: 1.25rem; width: 210px; }
  .art-end-cta { padding: 1.5rem 1.25rem; gap: 1.25rem; }
}


/* ============================================================
   FAQ PAGE
   ============================================================ */

/* Search bar */
.faq-search-wrap {
  margin-top: 2rem;
  max-width: 600px;
  margin-inline: auto;
}
.faq-search-inner {
  position: relative;
  display: flex;
  align-items: center;
}
.faq-search-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-3);
  font-size: 0.9rem;
  pointer-events: none;
}
.faq-search-input {
  width: 100%;
  padding: 0.85rem 3.5rem 0.85rem 2.75rem;
  border: 1px solid var(--border-2);
  border-radius: var(--r);
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.925rem;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.faq-search-input::placeholder { color: var(--text-3); }
.faq-search-input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.faq-search-kbd {
  position: absolute;
  right: 0.85rem;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(255,255,255,0.04);
  color: var(--text-3);
  font-size: 0.7rem;
  font-family: ui-monospace, monospace;
  cursor: pointer;
}
.faq-search-hint {
  margin-top: 0.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-3);
}

/* Page layout: sidebar + content */
.faq-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  align-items: start;
  padding-top: 3rem;
  padding-bottom: 4rem;
}

/* Sidebar */
.faq-sidebar {
  position: sticky;
  top: calc(var(--hh) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.faq-cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.faq-cat-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.55rem 0.85rem;
  border-radius: var(--r-sm);
  color: var(--text-2);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--ease), background var(--ease);
  text-decoration: none;
}
.faq-cat-link i { width: 16px; text-align: center; font-size: 0.85rem; flex-shrink: 0; color: var(--text-3); transition: color var(--ease); }
.faq-cat-link span { flex: 1; }
.faq-cat-link:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.faq-cat-link:hover i { color: var(--brand); }
.faq-cat-link.is-active { color: var(--brand); background: rgba(99,102,241,0.1); }
.faq-cat-link.is-active i { color: var(--brand); }
.faq-cat-count {
  font-style: normal;
  font-size: 0.72rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.07);
  color: var(--text-3);
  line-height: 1.4;
  flex-shrink: 0;
}
.faq-cat-link.is-active .faq-cat-count { background: rgba(99,102,241,0.2); color: var(--brand); }

.faq-sidebar-cta {
  padding: 1rem;
  border: 1px dashed var(--border);
  border-radius: var(--r);
  background: rgba(255,255,255,0.02);
  text-align: center;
}
.faq-sidebar-cta p { margin: 0 0 0.65rem; color: var(--text-3); font-size: 0.8rem; }
.faq-sidebar-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--brand);
  border-radius: var(--r-sm);
  color: var(--brand);
  font-size: 0.8rem;
  font-weight: 600;
  transition: background var(--ease);
}
.faq-sidebar-btn:hover { background: rgba(99,102,241,0.1); color: var(--brand); }

/* Content area */
.faq-content { min-width: 0; }

/* Category section */
.faq-cat-section { margin-bottom: 3rem; scroll-margin-top: calc(var(--hh) + 1.5rem); }
.faq-cat-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1.25rem;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.faq-cat-title i { color: var(--brand); font-size: 0.95rem; }

/* Code blocks inside FAQ answers */
.faq-code {
  position: relative;
  margin-top: 0.75rem;
  padding: 0.9rem 3rem 0.9rem 1rem;
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow-x: auto;
}
.faq-code code {
  display: block;
  color: #86efac;
  font-family: ui-monospace, monospace;
  font-size: 0.82rem;
  white-space: pre;
  line-height: 1.7;
}
.faq-code-copy {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  padding: 0.3rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(255,255,255,0.05);
  color: var(--text-3);
  font-size: 0.75rem;
  cursor: pointer;
  transition: color var(--ease), background var(--ease);
}
.faq-code-copy:hover { color: var(--text); background: rgba(255,255,255,0.1); }
.faq-code-copy.copied { color: var(--green); border-color: rgba(16,185,129,0.3); }

/* FAQ table inside answers */
.faq-table {
  width: 100%;
  margin-top: 0.75rem;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.faq-table th, .faq-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.faq-table th { background: rgba(255,255,255,0.04); color: var(--text-2); font-weight: 600; font-size: 0.8rem; }
.faq-table td { color: var(--text-2); }
.faq-table td code { font-size: 0.78rem; color: var(--cyan); background: rgba(6,182,212,0.1); padding: 0.1rem 0.3rem; border-radius: 3px; }

/* faq-a */
.faq-a ol, .faq-a ul { padding-left: 1.4rem; margin: 0.5rem 0; }
.faq-a li { margin-bottom: 0.35rem; color: var(--text-2); line-height: 1.7; }
.faq-a code { font-size: 0.82rem; color: var(--cyan); background: rgba(6,182,212,0.1); padding: 0.1rem 0.35rem; border-radius: 3px; }
.faq-a a { color: var(--cyan); }

/* Empty state */
.faq-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 4rem 0;
  color: var(--text-3);
  text-align: center;
}
.faq-empty i { font-size: 2.5rem; opacity: 0.4; }
.faq-empty p { margin: 0; font-size: 0.95rem; }

/* CTA dual buttons */
.faq-cta-btns { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.faq-cta-btns .tut-cta-btn { display: inline-flex; }

/* tut-faq inside article */
.tut-faq { max-width: 100%; }

/* Tutorial CTA section */
.tut-cta {
  padding: 5rem 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-1) 0%, var(--bg) 100%);
  border-top: 1px solid var(--border);
}
.tut-cta h2 { margin: 0 0 0.5rem; font-family: var(--font-head); font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; letter-spacing: -0.03em; }
.tut-cta p { margin: 0 0 2rem; color: var(--text-2); }
.tut-cta-btn { display: inline-flex; }

@media (max-width: 900px) {
  .faq-layout { grid-template-columns: 1fr; }
  .faq-sidebar {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
  }
  .faq-cat-list { flex-direction: row; flex-wrap: wrap; gap: 0.35rem; }
  .faq-cat-link { padding: 0.4rem 0.7rem; font-size: 0.8rem; }
  .faq-sidebar-cta { display: none; }
}

/* ============================================================
   LEGAL PAGES (privacy.html / terms.html)
   ============================================================ */

.legal-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  gap: 4rem;
  align-items: start;
}

.legal-toc {
  position: sticky;
  top: calc(var(--hh) + 1.5rem);
}

/* legal body inherits art-body styles */
.legal-body { min-width: 0; }

@media (max-width: 900px) {
  .legal-layout { grid-template-columns: 1fr; gap: 0; padding: 1.5rem 1.25rem 4rem; }
  .legal-toc { position: static; display: none; }
}

/* ============================================================
   BLOG LIST PAGE
   ============================================================ */

.blog-hero { padding-bottom: 2.5rem; }

.blog-layout {
  padding-top: 2.5rem;
  padding-bottom: 5rem;
}

/* ── Category filter ── */
.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}
.blog-cat-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-2);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.blog-cat-btn i { font-size: 0.75rem; }
.blog-cat-btn:hover { color: var(--text); border-color: rgba(99,102,241,0.4); }
.blog-cat-btn.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  border-color: transparent;
  box-shadow: 0 2px 10px var(--brand-glow);
}

/* ── Featured card ── */
.blog-featured-card {
  display: grid;
  grid-template-columns: 360px 1fr;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  overflow: hidden;
  margin-bottom: 2.5rem;
  color: var(--text);
  transition: border-color var(--ease), transform var(--ease);
}
.blog-featured-card:hover { color: var(--text); border-color: rgba(99,102,241,0.4); transform: translateY(-2px); }
.blog-feat-cover {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  font-size: 4rem;
  color: rgba(255,255,255,0.2);
}
.blog-feat-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid rgba(255,255,255,0.15);
}
.blog-feat-body {
  padding: 2rem 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
}
.blog-feat-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.blog-feat-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text);
}
.blog-feat-excerpt {
  margin: 0;
  color: var(--text-2);
  font-size: 0.925rem;
  line-height: 1.7;
}
.blog-feat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.blog-feat-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--brand);
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 0.25rem;
  transition: gap var(--ease);
}
.blog-featured-card:hover .blog-feat-cta { gap: 0.65rem; }

/* ── Article grid ── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.blog-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-card);
  overflow: hidden;
  color: var(--text);
  transition: border-color var(--ease), transform var(--ease);
}
.blog-card:hover { color: var(--text); border-color: rgba(99,102,241,0.35); transform: translateY(-3px); }
.blog-card-cover {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: rgba(255,255,255,0.2);
  flex-shrink: 0;
}
.blog-card-body {
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}
.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.blog-card-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 0.975rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}
.blog-card-excerpt {
  margin: 0;
  color: var(--text-2);
  font-size: 0.84rem;
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}
.blog-card-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; }

/* ── Shared meta elements ── */
.blog-cat-tag {
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: rgba(99,102,241,0.12);
  color: var(--brand);
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
}
.blog-date {
  color: var(--text-3);
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.blog-reading-time {
  color: var(--text-3);
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}
.blog-tag {
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  background: rgba(255,255,255,0.05);
  color: var(--text-3);
  font-size: 0.72rem;
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* ── Empty state ── */
.blog-empty[hidden] { display: none; }   /* ensure hidden attr wins over display:flex below */
.blog-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 4rem 0;
  color: var(--text-3);
  text-align: center;
}
.blog-empty i { font-size: 2.5rem; opacity: 0.35; }
.blog-empty p { margin: 0; font-size: 0.95rem; }

/* ── Pagination ── */
.blog-pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2.5rem;
}
.blog-page-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-card);
  color: var(--text-2);
  font-size: 0.875rem;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.blog-page-btn:hover { color: var(--text); border-color: var(--brand); }
.blog-page-btn.is-active {
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  border-color: transparent;
  color: #fff;
}

/* ── Article byline ── */
.art-byline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-3);
  font-size: 0.84rem;
}
.art-byline i { margin-right: 0.3rem; }
.art-byline-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .blog-featured-card { grid-template-columns: 1fr; }
  .blog-feat-cover { min-height: 160px; }
  .blog-grid { grid-template-columns: 1fr; }
}


/* ============================================================
   MOBILE RESPONSIVE — GLOBAL OVERRIDES
   All breakpoints are mobile-first overrides added on top of
   existing desktop rules. Applied last so they win specificity.
   ============================================================ */

/* ── Orphan utility classes (used in HTML, missing from CSS) ── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.tut-hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
  color: var(--brand);
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.tut-step-link {
  color: var(--brand);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ── FAQ table: prevent horizontal page overflow ── */
.faq-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0.75rem 0;
}
.faq-table {
  min-width: 520px;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.faq-table thead th,
.faq-table tbody td:not(:last-child) { white-space: nowrap; }
.faq-table thead th:last-child,
.faq-table tbody td:last-child {
  white-space: normal;
  min-width: 130px;
}

/* ============================================================
   @media (max-width: 768px) — TABLET / LARGE PHONE
   ============================================================ */
@media (max-width: 768px) {

  /* ── Global section rhythm ── */
  .section         { padding: 3.5rem 0; }
  .page-hero       { padding: 2.5rem 0 2rem; }
  .sec-head        { margin-bottom: 1.75rem; }
  .sec-title       { font-size: 1.55rem; }

  /* ── Homepage hero ── */
  .hero            { padding: 2.5rem 0 3rem; }

  /* ── Download page ── */
  .dl-feat-actions {
    flex-direction: column;
    min-width: 0;
    width: 100%;
  }
  .btn-dl-primary,
  .btn-dl-sec,
  .btn-appstore    { width: 100%; justify-content: center; }
  .dl-alt          { align-items: flex-start; gap: 0.75rem; }
  .dl-alt-info     { width: 100%; }
  .dl-alt-btn      { width: 100%; justify-content: center; white-space: normal; text-align: center; }
  .dl-alt-btns     { width: 100%; }
  .dl-site-card-bar {
    flex-wrap: wrap;
    gap: 0.4rem;
  }
  .dl-site-bar-url  { flex: 1 1 100%; text-align: center; overflow: hidden; text-overflow: ellipsis; }
  .dl-site-bar-visit { width: 100%; justify-content: center; }

  /* ── Download: advanced mono buttons ── */
  .dl-advanced-btns { flex-direction: column; }
  .btn-dl-mono      { width: 100%; justify-content: flex-start; overflow-wrap: break-word; word-break: break-all; }

  /* ── FAQ ── */
  .faq-search-kbd  { display: none; }
  .faq-search-input { padding-right: 1rem; }
  .faq-cat-link    { font-size: 0.78rem; padding: 0.3rem 0.65rem; }

  /* ── Blog listing ── */
  .blog-feat-body  { padding: 1.5rem; }
  .blog-feat-title { font-size: 1.15rem; }
  .blog-feat-meta  { font-size: 0.78rem; }
  .blog-card       { display: flex; flex-direction: column; }

  /* ── Article pages ── */
  .art-header-meta { gap: 0.4rem; flex-wrap: wrap; }
  .art-byline      { flex-direction: column; gap: 0.4rem; align-items: flex-start; }
  .art-title       { font-size: clamp(1.4rem, 5vw, 1.9rem); }

  /* ── Footer bottom row ── */
  .footer-bottom   { flex-direction: column; gap: 0.5rem; text-align: center; }
  .footer-legal    { justify-content: center; }
}

/* ── Topo diagram switch: landscape SVG → portrait SVG at ≤600px ── */
@media (max-width: 600px) {
  .topo-svg:not(.topo-svg-mobile) { display: none; }
  .topo-svg-mobile                { display: block; max-width: 260px; margin: 0 auto; }
  /* Move diagram below text on mobile */
  .hero-visual                    { order: 1; margin-top: 1.5rem; max-width: 100%; }
}

/* ============================================================
   @media (max-width: 480px) — PHONE
   ============================================================ */
@media (max-width: 480px) {

  /* ── Global ── */
  .section         { padding: 2.5rem 0; }
  .page-hero       { padding: 1.75rem 0 1.5rem; }
  .page-hero-title { font-size: 1.5rem; }
  .page-hero-desc  { font-size: 0.88rem; }
  .container       { padding-inline: 1rem; }

  /* ── Homepage ── */
  .hero            { padding: 2rem 0 2.5rem; }
  .hero-h1         { font-size: 1.9rem; letter-spacing: -0.03em; }
  .hero-sub        { font-size: 0.95rem; }
  .hero-pills      { gap: 0.35rem; }
  .pill            { font-size: 0.72rem; padding: 0.25rem 0.6rem; }

  /* Rule simulator rows */
  .sim-rule        { gap: 0.35rem; }
  .rule-body       { font-size: 0.72rem; gap: 0.25rem; overflow-x: auto; }
  .rule-type,
  .rule-val,
  .rule-action     { font-size: 0.65rem; padding: 0.12rem 0.35rem; }
  .rule-status     { min-width: 3rem; font-size: 0.68rem; }
  .sim-result-wrap { font-size: 0.78rem; }

  /* Client cards */
  .client-card     { padding: 1.25rem; }
  .client-actions  { flex-direction: column; gap: 0.5rem; }
  .client-actions .btn-dl-sm { width: 100%; justify-content: center; }

  /* ── Download ── */
  .dl-feat         { padding: 1.25rem; }
  .dl-feat-title   { font-size: 1.15rem; }
  .dl-feat-desc    { font-size: 0.88rem; }
  .dl-site-card    { margin-top: 1.5rem; }

  /* Alt rows */
  .dl-alt          { flex-direction: column; gap: 0.75rem; }
  .dl-alt-name     { font-size: 0.9rem; }

  /* ── FAQ ── */
  .faq-cat-list    { gap: 0.35rem; }
  .faq-cat-link    { font-size: 0.74rem; padding: 0.25rem 0.55rem; }

  /* ── Blog listing ── */
  .blog-feat-body  { padding: 1.25rem; }
  .blog-feat-tags  { flex-wrap: wrap; gap: 0.3rem; }
  .blog-card-footer { flex-wrap: wrap; row-gap: 0.4rem; }
  .blog-card-tags  { flex-wrap: wrap; gap: 0.3rem; }
  .blog-tag        { font-size: 0.7rem; }
  .blog-filter     { gap: 0.35rem; }
  .blog-cat-btn    { font-size: 0.78rem; padding: 0.3rem 0.75rem; }

  /* ── Article pages ── */
  .art-layout      { padding: 1.25rem 1rem 3rem; }
  .art-section     { margin-bottom: 2rem; }
  .art-section h2  { font-size: 1.2rem; }
  .art-section h3  { font-size: 1rem; }

  /* End CTA — stack vertically */
  .art-end-cta     { flex-direction: column; gap: 1rem; align-items: flex-start; }
  .art-end-cta-icon { width: 44px; height: 44px; }
  .art-end-cta-btns { flex-direction: column; width: 100%; }
  .art-end-cta-primary,
  .art-end-cta-ghost { width: 100%; justify-content: center; }

  /* Float card — smaller on very narrow screens */
  .art-float-card  { width: 188px; bottom: 1rem; right: 1rem; }
  .art-float-card-body { padding: 0.7rem; }
}

/* ============================================================
   @media (max-width: 360px) — VERY SMALL PHONE
   ============================================================ */
@media (max-width: 360px) {
  .hero-h1         { font-size: 1.7rem; }
  .art-float-card  { display: none; }   /* too intrusive at this width */
  .os-tab          { padding: 0.5rem 0.3rem; }
  .dl-tabs-bar .os-tab { padding: 0.5rem 0.25rem; }
}