/* ==========================================================================
   WEEX V8 — AEO Answer Hub & Knowledge Graph Conversion Page
   Independent Theme System (theme-v8 tokens)
   Visual thesis: calm knowledge portal — ink-midnight base, emerald CTA,
   indigo knowledge accent, answer-first clarity. Distinct from V1–V7.
   ========================================================================== */

/* ---- theme-v8 tokens ---- */
:root {
  /* base surfaces */
  --v8-base: #0A0F1C;
  --v8-base-2: #0D1320;
  --v8-surface: #121A2B;
  --v8-surface-2: #1A2438;
  --v8-surface-3: #212C44;

  /* brand / CTA */
  --v8-cta: #10B981;          /* emerald — register / primary action */
  --v8-cta-hover: #059669;
  --v8-cta-soft: rgba(16,185,129,0.12);
  --v8-cta-border: rgba(16,185,129,0.35);

  /* knowledge accent */
  --v8-knowledge: #818CF8;    /* indigo — knowledge / answer */
  --v8-knowledge-soft: rgba(129,140,248,0.12);
  --v8-knowledge-border: rgba(129,140,248,0.25);

  /* answer highlight */
  --v8-answer: #34D399;
  --v8-answer-soft: rgba(52,211,153,0.10);

  /* download secondary */
  --v8-download: #60A5FA;
  --v8-download-soft: rgba(96,165,250,0.12);
  --v8-download-border: rgba(96,165,250,0.30);

  /* bonus */
  --v8-bonus: #F59E0B;

  /* risk / muted */
  --v8-risk: #64748B;
  --v8-risk-soft: rgba(100,116,139,0.12);

  /* text */
  --v8-text: #E8ECF4;
  --v8-text-muted: #8892A6;
  --v8-text-dim: #5C6478;

  /* borders */
  --v8-border: rgba(129,140,248,0.14);
  --v8-border-soft: rgba(255,255,255,0.06);

  /* radius */
  --v8-radius-sm: 8px;
  --v8-radius: 14px;
  --v8-radius-lg: 20px;
  --v8-radius-xl: 28px;

  /* shadow */
  --v8-shadow: 0 8px 32px rgba(0,0,0,0.4);
  --v8-shadow-glow: 0 0 0 1px var(--v8-border), 0 12px 40px rgba(10,15,28,0.6);

  /* spacing scale */
  --v8-space-xs: 4px;
  --v8-space-s: 8px;
  --v8-space-m: 16px;
  --v8-space-l: 24px;
  --v8-space-xl: 40px;
  --v8-space-2xl: 64px;
  --v8-space-3xl: 96px;

  /* fonts */
  --v8-font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --v8-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --v8-font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* layout */
  --v8-maxw: 1180px;
  --v8-header-h: 64px;
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--v8-font-body);
  background: var(--v8-base);
  color: var(--v8-text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* skip link */
.skip-link {
  position: absolute; top: -40px; left: 8px; z-index: 999;
  background: var(--v8-cta); color: #04130D; padding: 8px 16px;
  border-radius: 6px; font-weight: 600; font-size: 14px;
}
.skip-link:focus { top: 8px; }

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--v8-font-body); font-weight: 600; font-size: 15px;
  padding: 12px 24px; border-radius: var(--v8-radius-sm);
  transition: all 0.2s ease; white-space: nowrap; cursor: pointer;
  text-align: center; line-height: 1.2;
}
.btn-register, .btn-register-lg, .btn-register-sticky {
  background: var(--v8-cta); color: #04130D;
  box-shadow: 0 4px 20px rgba(16,185,129,0.25);
}
.btn-register:hover, .btn-register-lg:hover {
  background: var(--v8-cta-hover); transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(16,185,129,0.4);
}
.btn-download, .btn-download-lg, .btn-download-sticky {
  background: transparent; color: var(--v8-download);
  border: 1.5px solid var(--v8-download-border);
}
.btn-download:hover, .btn-download-lg:hover {
  background: var(--v8-download-soft); border-color: var(--v8-download);
  transform: translateY(-1px);
}
.btn-register-sm {
  background: var(--v8-cta); color: #04130D;
  font-size: 14px; padding: 10px 20px; border-radius: var(--v8-radius-sm);
  font-weight: 600; transition: all 0.2s;
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 38px; line-height: 1;
}
.btn-register-sm:hover { background: var(--v8-cta-hover); transform: translateY(-1px); }
.btn-download-sm {
  background: transparent; color: var(--v8-download);
  border: 1.5px solid var(--v8-download-border);
  font-size: 14px; padding: 10px 20px; border-radius: var(--v8-radius-sm);
  font-weight: 600; transition: all 0.2s;
}
.btn-download-sm:hover { background: var(--v8-download-soft); border-color: var(--v8-download); }
.btn-register-lg, .btn-download-lg { font-size: 16px; padding: 16px 32px; border-radius: 10px; }

/* ---- header ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,15,28,0.72);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--v8-border-soft);
  transition: background 0.3s, border-color 0.3s;
}
.site-header.scrolled {
  background: rgba(10,15,28,0.92);
  border-bottom-color: var(--v8-border);
}
.header-inner {
  max-width: var(--v8-maxw); margin: 0 auto;
  height: var(--v8-header-h); padding: 0 24px;
  display: flex; align-items: center; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo { height: 26px; width: auto; }
.brand-tag {
  font-family: var(--v8-font-mono); font-size: 11px; font-weight: 500;
  color: var(--v8-knowledge); background: var(--v8-knowledge-soft);
  padding: 3px 8px; border-radius: 4px; letter-spacing: 0.02em;
}
.cluster-nav { display: flex; gap: 4px; flex: 1; justify-content: center; }
.cluster-link {
  font-size: 14px; font-weight: 500; color: var(--v8-text-muted);
  padding: 8px 14px; border-radius: var(--v8-radius-sm);
  transition: all 0.2s;
}
.cluster-link:hover { color: var(--v8-text); background: var(--v8-surface); }
.header-cta { display: flex; gap: 10px; flex-shrink: 0; }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px; padding: 8px;
}
.nav-toggle span {
  width: 22px; height: 2px; background: var(--v8-text); border-radius: 2px;
  transition: all 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- hero ---- */
.hero {
  position: relative; padding: 80px 24px 56px;
  max-width: var(--v8-maxw); margin: 0 auto;
}
.hero::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 900px; height: 500px; z-index: -1; pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(129,140,248,0.10) 0%, transparent 60%);
}
.hero-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: 56px; align-items: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--v8-font-mono); font-size: 12px; font-weight: 500;
  color: var(--v8-knowledge); margin-bottom: 20px;
  letter-spacing: 0.03em;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--v8-knowledge);
  box-shadow: 0 0 8px var(--v8-knowledge);
}
.hero-title {
  font-family: var(--v8-font-display); font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 700; line-height: 1.15; letter-spacing: -0.02em;
  margin-bottom: 20px; color: var(--v8-text);
}
.hl-knowledge { color: var(--v8-knowledge); }
.hl-answer { color: var(--v8-answer); }
.hero-sub {
  font-size: 17px; color: var(--v8-text-muted); line-height: 1.65;
  max-width: 540px; margin-bottom: 32px;
}
.hero-cta-row { display: flex; gap: 14px; margin-bottom: 18px; flex-wrap: wrap; }
.hero-trust {
  font-size: 13px; color: var(--v8-text-dim); font-family: var(--v8-font-mono);
}

/* hero preview card */
.hero-preview { position: relative; }
.preview-card {
  background: var(--v8-surface); border: 1px solid var(--v8-border);
  border-radius: var(--v8-radius-lg); overflow: hidden;
  box-shadow: var(--v8-shadow-glow);
}
.preview-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 12px 16px; background: var(--v8-surface-2);
  border-bottom: 1px solid var(--v8-border-soft);
}
.preview-dot { width: 10px; height: 10px; border-radius: 50%; }
.preview-dot.r { background: #EF4444; } .preview-dot.y { background: #F59E0B; } .preview-dot.g { background: #10B981; }
.preview-url {
  margin-left: 8px; font-family: var(--v8-font-mono); font-size: 11px;
  color: var(--v8-text-dim);
}
.preview-body { padding: 24px; }
.preview-q {
  font-family: var(--v8-font-display); font-size: 19px; font-weight: 600;
  color: var(--v8-text); margin-bottom: 16px;
}
.preview-a {
  background: var(--v8-answer-soft); border-left: 3px solid var(--v8-answer);
  border-radius: 0 var(--v8-radius-sm) var(--v8-radius-sm) 0;
  padding: 14px 16px; margin-bottom: 16px; position: relative;
}
.ai-badge {
  display: inline-block; font-family: var(--v8-font-mono); font-size: 10px;
  font-weight: 600; color: var(--v8-answer); background: rgba(52,211,153,0.15);
  padding: 2px 8px; border-radius: 4px; margin-bottom: 8px; letter-spacing: 0.04em;
}
.preview-a p { font-size: 14px; color: var(--v8-text); line-height: 1.6; }
.preview-meta { display: flex; gap: 8px; margin-bottom: 16px; }
.meta-tag {
  font-size: 11px; font-family: var(--v8-font-mono); color: var(--v8-text-muted);
  background: var(--v8-surface-2); padding: 3px 10px; border-radius: 4px;
}
.preview-cta {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 14px; font-weight: 600; color: var(--v8-cta);
  transition: gap 0.2s;
  padding: 8px 0; min-height: 38px; line-height: 1.2;
}
.preview-cta:hover { gap: 8px; }

/* hero chips */
.hero-chips {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 48px;
  padding-top: 32px; border-top: 1px solid var(--v8-border-soft);
}
.chip {
  font-size: 13px; font-weight: 500; color: var(--v8-text-muted);
  background: var(--v8-surface); border: 1px solid var(--v8-border-soft);
  padding: 8px 16px; border-radius: 100px; transition: all 0.2s;
}
.chip:hover {
  color: var(--v8-knowledge); border-color: var(--v8-knowledge-border);
  background: var(--v8-knowledge-soft);
}

/* ---- section base ---- */
.section {
  max-width: var(--v8-maxw); margin: 0 auto;
  padding: var(--v8-space-3xl) 24px;
}
.section-head { margin-bottom: var(--v8-space-xl); }
.section-index {
  display: inline-block; font-family: var(--v8-font-mono); font-size: 13px;
  font-weight: 500; color: var(--v8-knowledge); margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.section-title {
  font-family: var(--v8-font-display); font-size: clamp(24px, 3vw, 32px);
  font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px;
}
.section-desc {
  font-size: 16px; color: var(--v8-text-muted); max-width: 620px;
}

/* ---- top questions grid ---- */
.tq-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.tq-card {
  background: var(--v8-surface); border: 1px solid var(--v8-border-soft);
  border-radius: var(--v8-radius); padding: 24px;
  display: flex; flex-direction: column; gap: 10px;
  transition: all 0.25s ease; position: relative; overflow: hidden;
}
.tq-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--v8-knowledge); transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s;
}
.tq-card[data-cluster="register"]::before { background: var(--v8-cta); }
.tq-card[data-cluster="download"]::before { background: var(--v8-download); }
.tq-card[data-cluster="beginner"]::before { background: var(--v8-bonus); }
.tq-card[data-cluster="trust"]::before { background: var(--v8-knowledge); }
.tq-card:hover {
  border-color: var(--v8-border); background: var(--v8-surface-2);
  transform: translateY(-3px);
}
.tq-card:hover::before { transform: scaleX(1); }
.tq-num {
  font-family: var(--v8-font-mono); font-size: 12px; font-weight: 500;
  color: var(--v8-text-dim);
}
.tq-q {
  font-family: var(--v8-font-display); font-size: 16px; font-weight: 600;
  line-height: 1.35; color: var(--v8-text);
}
.tq-a { font-size: 13px; color: var(--v8-text-muted); line-height: 1.55; flex: 1; }
.tq-arrow {
  font-size: 13px; font-weight: 600; color: var(--v8-knowledge);
  margin-top: 4px;
}
.tq-card[data-cluster="register"] .tq-arrow { color: var(--v8-cta); }
.tq-card[data-cluster="download"] .tq-arrow { color: var(--v8-download); }
.tq-card[data-cluster="beginner"] .tq-arrow { color: var(--v8-bonus); }

/* ---- answer cluster ---- */
.cluster-download { background: linear-gradient(180deg, transparent, rgba(96,165,250,0.025), transparent); }
.cluster-trust { background: linear-gradient(180deg, transparent, rgba(129,140,248,0.025), transparent); }

.answer-stack { display: flex; flex-direction: column; gap: 20px; max-width: 860px; }
.answer-block {
  background: var(--v8-surface); border: 1px solid var(--v8-border-soft);
  border-radius: var(--v8-radius-lg); padding: 28px 32px;
  transition: border-color 0.2s;
}
.answer-block:hover { border-color: var(--v8-border); }
.answer-head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.cluster-tag {
  font-family: var(--v8-font-mono); font-size: 11px; font-weight: 600;
  padding: 4px 10px; border-radius: 4px; letter-spacing: 0.03em;
}
.tag-register { color: var(--v8-cta); background: var(--v8-cta-soft); }
.tag-download { color: var(--v8-download); background: var(--v8-download-soft); }
.tag-beginner { color: var(--v8-bonus); background: rgba(245,158,11,0.12); }
.tag-trust { color: var(--v8-knowledge); background: var(--v8-knowledge-soft); }
.answer-q {
  font-family: var(--v8-font-display); font-size: 20px; font-weight: 600;
  line-height: 1.35; color: var(--v8-text);
}
.answer-summary {
  background: var(--v8-answer-soft); border-left: 3px solid var(--v8-answer);
  border-radius: 0 var(--v8-radius-sm) var(--v8-radius-sm) 0;
  padding: 16px 20px; margin-bottom: 16px;
}
.summary-label {
  display: block; font-family: var(--v8-font-mono); font-size: 10px;
  font-weight: 600; color: var(--v8-answer); letter-spacing: 0.05em;
  margin-bottom: 8px; text-transform: uppercase;
}
.answer-summary p { font-size: 15px; color: var(--v8-text); line-height: 1.7; }
.answer-detail { margin-bottom: 16px; }
.answer-detail summary {
  font-size: 14px; font-weight: 600; color: var(--v8-knowledge);
  cursor: pointer; padding: 8px 0; user-select: none;
  list-style: none;
}
.answer-detail summary::-webkit-details-marker { display: none; }
.answer-detail summary::before { content: '+ '; }
.answer-detail[open] summary::before { content: '− '; }
.detail-body { padding: 12px 0 4px; }
.step-list { display: flex; flex-direction: column; gap: 10px; counter-reset: step; }
.step-list li {
  font-size: 14px; color: var(--v8-text-muted); line-height: 1.6;
  padding-left: 24px; position: relative;
}
.step-list li::before {
  content: counter(step); counter-increment: step;
  position: absolute; left: 0; top: 0;
  font-family: var(--v8-font-mono); font-size: 11px; font-weight: 600;
  color: var(--v8-knowledge); background: var(--v8-knowledge-soft);
  width: 18px; height: 18px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.detail-note {
  font-size: 13px; color: var(--v8-text-dim); margin-top: 12px;
  font-style: italic;
}
.answer-note {
  font-size: 13px; color: var(--v8-text-dim); margin-bottom: 16px;
  padding: 10px 14px; background: var(--v8-risk-soft); border-radius: var(--v8-radius-sm);
  border-left: 2px solid var(--v8-risk);
}
.answer-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.cta-combo { gap: 12px; }

/* platform buttons */
.platform-row { display: flex; gap: 14px; margin-top: 8px; flex-wrap: wrap; }
.platform-btn {
  display: flex; align-items: center; gap: 12px;
  background: var(--v8-surface-2); border: 1px solid var(--v8-border-soft);
  border-radius: var(--v8-radius-sm); padding: 14px 20px;
  transition: all 0.2s;
}
.platform-btn:hover {
  border-color: var(--v8-download-border); background: var(--v8-download-soft);
  transform: translateY(-2px);
}
.platform-icon { color: var(--v8-download); display: flex; }
.platform-text { display: flex; flex-direction: column; line-height: 1.2; }
.platform-text small { font-size: 11px; color: var(--v8-text-dim); }
.platform-text strong { font-size: 15px; color: var(--v8-text); font-weight: 600; }

/* ---- quick start flow ---- */
.quick-start { background: var(--v8-base-2); }
.flow-path {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  position: relative; counter-reset: flow;
}
.flow-path::before {
  content: ''; position: absolute; top: 28px; left: 12%; right: 12%; height: 2px;
  background: linear-gradient(90deg, var(--v8-knowledge), var(--v8-cta));
  opacity: 0.3; z-index: 0;
}
.flow-step {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  text-align: center; padding: 0 16px; position: relative; z-index: 1;
}
.flow-num {
  width: 56px; height: 56px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--v8-font-display); font-size: 18px; font-weight: 700;
  background: var(--v8-surface); border: 2px solid var(--v8-knowledge-border);
  color: var(--v8-knowledge); transition: all 0.3s;
}
.flow-step:nth-child(2) .flow-num { border-color: var(--v8-cta-border); color: var(--v8-cta); }
.flow-step:nth-child(3) .flow-num { border-color: var(--v8-download-border); color: var(--v8-download); }
.flow-step:nth-child(4) .flow-num { border-color: rgba(245,158,11,0.35); color: var(--v8-bonus); }
.flow-body { max-width: 200px; }
.flow-title {
  font-family: var(--v8-font-display); font-size: 16px; font-weight: 600;
  margin-bottom: 6px;
}
.flow-desc { font-size: 13px; color: var(--v8-text-muted); line-height: 1.55; }
.flow-tag {
  font-family: var(--v8-font-mono); font-size: 11px; color: var(--v8-text-dim);
  background: var(--v8-surface); padding: 4px 10px; border-radius: 4px;
}
.flow-tag.tag-go { color: var(--v8-bonus); background: rgba(245,158,11,0.12); }

/* ---- knowledge graph ---- */
.knowledge-graph { background: var(--v8-base-2); }
.kg-canvas {
  background: var(--v8-surface); border: 1px solid var(--v8-border-soft);
  border-radius: var(--v8-radius-lg); padding: 32px; overflow: hidden;
}
.kg-svg { width: 100%; height: auto; max-height: 380px; }
.kg-legend {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px;
  margin-top: 28px; padding-top: 28px; border-top: 1px solid var(--v8-border-soft);
}
.kg-rel {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-size: 14px; color: var(--v8-text-muted);
}
.kg-rel strong { color: var(--v8-text); }
.kg-dot {
  width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0;
}
.kg-dot.kg-register { background: var(--v8-cta); }
.kg-dot.kg-download { background: var(--v8-download); }
.kg-dot.kg-trading { background: var(--v8-knowledge); }
.kg-dot.kg-bonus { background: var(--v8-bonus); }
.kg-dot.kg-risk { background: var(--v8-risk); }
.kg-link {
  font-size: 12px; font-weight: 600; color: var(--v8-knowledge);
  margin-left: auto; padding: 3px 10px; border: 1px solid var(--v8-knowledge-border);
  border-radius: 4px; transition: all 0.2s;
}
.kg-link:hover { background: var(--v8-knowledge-soft); }

/* ---- final CTA ---- */
.final-cta {
  background: radial-gradient(ellipse at center, rgba(16,185,129,0.08) 0%, transparent 70%), var(--v8-base-2);
  text-align: center; padding: var(--v8-space-3xl) 24px;
}
.final-inner { max-width: 680px; margin: 0 auto; }
.final-eyebrow {
  font-family: var(--v8-font-mono); font-size: 13px; color: var(--v8-cta);
  margin-bottom: 16px; letter-spacing: 0.03em;
}
.final-title {
  font-family: var(--v8-font-display); font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px;
}
.final-sub { font-size: 17px; color: var(--v8-text-muted); margin-bottom: 36px; line-height: 1.6; }
.final-cta-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 24px; }
.final-trust { font-size: 13px; color: var(--v8-text-dim); font-family: var(--v8-font-mono); }

/* ---- footer ---- */
.site-footer {
  background: var(--v8-base-2); border-top: 1px solid var(--v8-border-soft);
  padding: 56px 24px 100px;
}
.footer-inner {
  max-width: var(--v8-maxw); margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr 2fr; gap: 48px;
}
.footer-brand img { margin-bottom: 16px; }
.footer-tagline { font-size: 14px; color: var(--v8-text-muted); line-height: 1.6; max-width: 340px; }
.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer-col-title {
  font-family: var(--v8-font-display); font-size: 14px; font-weight: 600;
  color: var(--v8-text); margin-bottom: 14px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 14px; color: var(--v8-text-muted); transition: color 0.2s; }
.footer-col a:hover { color: var(--v8-cta); }
.footer-disclaimer {
  max-width: var(--v8-maxw); margin: 40px auto 0;
  padding-top: 28px; border-top: 1px solid var(--v8-border-soft);
}
.footer-disclaimer p { font-size: 12px; color: var(--v8-text-dim); line-height: 1.7; margin-bottom: 8px; }
.footer-copy { font-family: var(--v8-font-mono); }

/* ---- mobile sticky CTA ---- */
.sticky-cta {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 90;
  display: none; gap: 10px; padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(10,15,28,0.96); backdrop-filter: blur(20px);
  border-top: 1px solid var(--v8-border);
  transform: translateY(100%); transition: transform 0.3s ease;
}
.sticky-cta.show { transform: translateY(0); }
.sticky-cta .btn { flex: 1; padding: 14px; font-size: 15px; }
.btn-register-sticky { box-shadow: none; }
.btn-download-sticky { background: var(--v8-surface-2); }

/* ---- hide helper ---- */
.hide-mobile { display: inline; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .tq-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-preview { max-width: 480px; }
  .flow-path { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
  .flow-path::before { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .kg-legend { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --v8-space-3xl: 64px; --v8-space-2xl: 48px; }
  .cluster-nav {
    position: fixed; top: var(--v8-header-h); left: 0; right: 0;
    flex-direction: column; background: var(--v8-base-2);
    padding: 16px 24px; gap: 4px; border-bottom: 1px solid var(--v8-border);
    transform: translateY(-120%); transition: transform 0.3s; z-index: 99;
  }
  .cluster-nav.open { transform: translateY(0); }
  .cluster-link { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .header-cta .btn-download-sm { display: none; }
  .header-cta .btn-register-sm { padding: 8px 16px; font-size: 13px; }
  .header-inner { gap: 12px; padding: 0 16px; }
  .brand-tag { display: none; }

  .hero { padding: 48px 16px 40px; }
  .hero-title { font-size: 28px; }
  .hero-sub { font-size: 15px; }
  .hide-mobile { display: none; }
  .hero-cta-row .btn { flex: 1; min-width: 0; }

  .section { padding: 64px 16px; }
  .section-title { font-size: 22px; }
  .tq-grid { grid-template-columns: 1fr; }
  .tq-card { padding: 20px; }

  .answer-block { padding: 22px 20px; }
  .answer-q { font-size: 18px; }
  .answer-summary { padding: 14px 16px; }
  .answer-summary p { font-size: 14px; }
  .platform-row { flex-direction: column; }
  .platform-btn { width: 100%; }

  .flow-path { grid-template-columns: 1fr; gap: 24px; }
  .flow-body { max-width: 100%; }

  .kg-canvas { padding: 16px; }
  .kg-svg { max-height: 280px; }

  .final-cta-row { flex-direction: column; }
  .final-cta-row .btn { width: 100%; }

  .footer-nav { grid-template-columns: 1fr; gap: 24px; }

  .sticky-cta { display: flex; }
}

@media (max-width: 420px) {
  .hero-title { font-size: 24px; }
  .hero-cta-row { flex-direction: column; }
  .hero-cta-row .btn { width: 100%; }
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---- focus states (a11y) ---- */
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--v8-knowledge); outline-offset: 2px; border-radius: 4px;
}