:root {
  --primary: #0099ff;
  --primary-light: #3db4ff;
  --primary-dark: #0077cc;
  --primary-bg: rgba(0,153,255,0.06);
  --accent: #0099ff;
  --bg: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #fafbfc;
  --bg-surface: #f5f6f8;
  --text: rgba(0,0,0,0.9);
  --text-secondary: rgba(60,60,67,0.76);
  --text-muted: rgba(0,0,0,0.4);
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.15);
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.14);
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-en: var(--font);
  --max-w: 1200px;
  --transition: all .3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font); color: var(--text); background: var(--bg);
  line-height: 1.5; -webkit-font-smoothing: antialiased; overflow-x: hidden;
  text-rendering: optimizeSpeed;
}

/* ══ NAV ══ */
.nav {
  position: sticky; top: 0; left: 0; right: 0; z-index: 2001; width: 100%;
  height: 60px;
  background: linear-gradient(135deg, rgba(26,31,78,0.96), rgba(37,58,128,0.94));
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all .35s ease;
}
.nav.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
  background: linear-gradient(135deg, rgba(26,31,78,0.98), rgba(37,58,128,0.97));
}
.nav-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #fff; transition: opacity .2s; }
.nav-logo:hover { opacity: 0.85; }
.logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.2);
  color: #fff; font-weight: 800; font-size: 13px; border-radius: 8px;
}
.logo-text { font-weight: 600; font-size: 16px; color: #fff; letter-spacing: 0.01em; }
.nav-links { display: flex; align-items: center; gap: 2px; height: 100%; }
.nav-links a {
  text-decoration: none; color: rgba(255,255,255,0.6); font-size: 14px; font-weight: 400;
  padding: 6px 14px; border-radius: 6px; height: auto; display: flex; align-items: center;
  transition: all .2s ease;
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.nav-links a[style*="color"] { color: #fff !important; background: rgba(255,255,255,0.1); font-weight: 500; }
.nav-cta {
  background: rgba(255,255,255,0.12) !important;
  border: 1px solid rgba(255,255,255,0.2) !important;
  color: #fff !important;
  padding: 7px 20px !important; border-radius: 7px; font-weight: 500 !important;
  font-size: 13px !important; height: auto !important;
  transition: all .25s ease !important;
  backdrop-filter: blur(8px);
}
.nav-cta:hover { background: rgba(255,255,255,0.2) !important; border-color: rgba(255,255,255,0.35) !important; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; color: rgba(255,255,255,0.7); padding: 8px; border-radius: 6px; transition: background .2s; }
.nav-toggle:hover { background: rgba(255,255,255,0.1); }

/* ══ BUTTONS ══ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 32px; border-radius: 8px; font-size: 16px; font-weight: 500;
  text-decoration: none; transition: var(--transition); cursor: pointer; border: none; font-family: var(--font);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { color: var(--text-secondary); background: transparent; }
.btn-ghost:hover { color: var(--text); }
.btn-white { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-white:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost-white { color: var(--text-secondary); background: rgba(0,0,0,0.04); border: 1px solid var(--border); }
.btn-ghost-white:hover { border-color: var(--primary); color: var(--primary); }
.btn-outline { color: var(--text-secondary); border: 1px solid var(--border); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 14px 40px; font-size: 16px; }

/* ══ SECTION ══ */
.section-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 32px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 12px; }
.section-header p { font-size: 16px; color: var(--text-secondary); max-width: 560px; margin: 0 auto; line-height: 1.6; }
.section-tag {
  display: inline-block; font-size: 13px; font-weight: 500;
  color: var(--primary); background: var(--primary-bg);
  padding: 4px 14px; border-radius: 4px; margin-bottom: 12px;
}

/* ══ HERO — QQ 1:1 ══ */
.hero {
  position: relative; width: 100%; height: 100vh; display: flex;
  flex-direction: column; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(
      90deg,
      rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px,
      transparent 1px, transparent 8px
    ),
    linear-gradient(
      180deg,
      #1a1f4e 0%,
      #1e2d6a 10%,
      #253a80 18%,
      #2e4a8e 24%,
      #3c5a9a 30%,
      #5568a8 36%,
      #6e6eb0 42%,
      #8868b0 48%,
      #a060a8 54%,
      #b860a0 58%,
      #c86898 62%,
      #d87898 66%,
      #e08898 70%,
      #e0a0a0 76%,
      #d8b0b0 82%,
      #d0b8c0 88%,
      #c8c0d0 94%,
      #c0c8d8 100%
    );
  background-size: 100% 200%;
  animation: heroGradient 16s ease-in-out infinite alternate;
}
@keyframes heroGradient {
  0% { background-position: 50% 0%; }
  100% { background-position: 50% 100%; }
}
.hero-center { position: relative; z-index: 1; margin-top: -40px; }
.hero-title {
  font-size: 52px; font-weight: 500; line-height: 1.3;
  color: #fff; margin-bottom: 36px;
  text-shadow: 0 0 40px rgba(255,255,255,0.3), 0 0 80px rgba(100,140,255,0.15);
}
.hero-download-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 44px; border-radius: 99px; font-size: 18px; font-weight: 500;
  background: rgba(255,255,255,0.15); color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  text-decoration: none; transition: var(--transition);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.hero-download-btn:hover {
  background: rgba(255,255,255,0.25); border-color: rgba(255,255,255,0.5);
  box-shadow: 0 0 30px rgba(255,255,255,0.1);
}
.hero-version {
  margin-top: 14px; font-size: 13px; color: rgba(255,255,255,0.6);
}
.hero-more-link {
  display: inline-block; margin-top: 10px;
  font-size: 14px; color: rgba(255,255,255,0.85); text-decoration: none;
  transition: color .2s ease;
}
.hero-more-link:hover { color: #fff; }
.hero-platforms-bar {
  position: absolute; bottom: 80px; left: 0; right: 0; z-index: 1;
  display: flex; justify-content: center; gap: 16px;
}
.hp-item {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px; font-size: 13px; font-weight: 400;
  color: rgba(255,255,255,0.4); text-decoration: none; transition: var(--transition);
  opacity: 0.7;
}
.hp-item svg { flex-shrink: 0; }
.hp-item:hover { color: rgba(255,255,255,0.7); opacity: 1; }
.hero-footer {
  position: absolute; bottom: 44px; left: 0; right: 0; z-index: 1;
  display: flex; justify-content: center; gap: 16px;
}
.hero-footer a { font-size: 13px; color: rgba(255,255,255,0.5); text-decoration: none; transition: color .2s; }
.hero-footer a:hover { color: rgba(255,255,255,0.8); }
.hero-copyright {
  position: absolute; bottom: 20px; left: 0; right: 0; z-index: 1;
  text-align: center; font-size: 11px; color: rgba(255,255,255,0.35);
}
.hero-metrics { display: flex; justify-content: center; gap: 48px; margin-top: 64px; position: relative; z-index: 1; }
.metric { text-align: center; }
.metric-value { font-size: 40px; font-weight: 600; color: var(--text); }
.metric-plus, .metric-unit { font-size: 20px; color: var(--primary); font-weight: 500; }
.metric-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.metric-divider { width: 1px; background: var(--border); align-self: stretch; }

/* ══ FEATURES ══ */
.features {
  padding: 100px 0; position: relative;
  background: linear-gradient(180deg, #c0c8d8 0%, #e8ecf4 15%, #f0f2f8 40%, #f8f9fc 100%);
}
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: rgba(255,255,255,0.8); border-radius: 16px;
  padding: 32px; transition: var(--transition);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.6);
}
.feature-card:hover { background: rgba(255,255,255,0.95); box-shadow: 0 8px 30px rgba(0,0,0,0.06); transform: translateY(-4px); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(30,45,106,0.08), rgba(85,104,168,0.06));
}
.feature-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* ══ WHY CHOOSE ══ */
.why-section { padding: 100px 0; background: #f8f9fc; }
.section-header h2 { color: var(--text); }
.why-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.why-card {
  background: #fff; border-radius: 16px;
  padding: 32px; transition: var(--transition);
  display: flex; gap: 18px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.why-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); transform: translateY(-3px); }
.why-icon {
  flex-shrink: 0; width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  background: linear-gradient(135deg, rgba(30,45,106,0.08), rgba(85,104,168,0.06));
}
.why-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.why-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* ══ CTA ══ */
.cta { padding: 0; }
.cta-card {
  text-align: center; padding: 80px 40px;
  border-radius: 0; position: relative; overflow: hidden; color: #fff;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 8px),
    linear-gradient(180deg, #1e2d6a 0%, #5568a8 30%, #8868b0 60%, #c86898 100%);
}
.cta-card::before { display: none; }
.cta-card h2 { font-size: 32px; font-weight: 500; margin-bottom: 14px; text-shadow: 0 0 30px rgba(255,255,255,0.2); }
.cta-card > p { font-size: 16px; color: rgba(255,255,255,0.7); margin-bottom: 28px; }
.cta-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.cta-buttons .btn-primary {
  background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(8px); box-shadow: none;
}
.cta-buttons .btn-primary:hover { background: rgba(255,255,255,0.25); box-shadow: 0 0 20px rgba(255,255,255,0.1); }
.cta-buttons .btn-ghost-white { color: rgba(255,255,255,0.7); border-color: rgba(255,255,255,0.2); background: transparent; }
.cta-buttons .btn-ghost-white:hover { color: #fff; border-color: rgba(255,255,255,0.4); }
.cta-note { font-size: 13px; color: rgba(255,255,255,0.4); margin-top: 14px; }

/* ══ QUICK LINKS ══ */
.quick-links { padding: 60px 0 80px; background: #f0f2f8; }
.ql-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.ql-card {
  display: block; text-decoration: none; color: var(--text);
  background: #fff; border-radius: 16px;
  padding: 28px; transition: var(--transition);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.ql-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); transform: translateY(-3px); }
.ql-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.ql-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 10px; }
.ql-arrow { color: var(--primary); font-size: 14px; font-weight: 500; }

/* ══ ARCH CARDS ══ */
.arch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.arch-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px; transition: var(--transition);
  position: relative;
}
.arch-card:hover { box-shadow: var(--shadow-md); border-color: transparent; }
.arch-card.featured { border-color: var(--primary); }
.arch-popular {
  position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
  background: var(--primary); color: #fff;
  font-size: 12px; font-weight: 500; padding: 3px 14px; border-radius: 99px;
}

/* ══ FOOTER ══ */
.footer { border-top: 1px solid var(--border); padding: 48px 0 28px; background: #fafbfc; }
.footer-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.footer-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; margin-bottom: 36px; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand-name { font-weight: 600; font-size: 16px; }
.footer-brand-desc { font-size: 13px; color: var(--text-muted); }
.footer-cols { display: flex; gap: 56px; }
.footer-col h4 { font-size: 12px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 12px; }
.footer-col a { display: block; text-decoration: none; color: var(--text-secondary); font-size: 14px; margin-bottom: 8px; transition: color .2s ease; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-muted); }

/* ══ DOWNLOAD CODE ══ */
.download-code {
  background: #1a1a1a; border-radius: var(--radius); padding: 16px 20px;
  text-align: left; position: relative;
}
.download-code::before {
  content: ''; position: absolute; top: 10px; left: 14px;
  width: 8px; height: 8px; border-radius: 50%; background: #ff5f57;
  box-shadow: 14px 0 0 #febc2e, 28px 0 0 #28c840;
}
.download-code code {
  display: block; font-family: SF Mono,Menlo,monospace; font-size: 13px;
  color: rgba(255,255,255,0.6); line-height: 1.8; padding-top: 14px;
}

@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* ══ FEATURE ROWS (features.html) ══ */
.feature-row { display: flex; gap: 48px; align-items: center; margin-bottom: 72px; }
.feature-row.reverse { flex-direction: row-reverse; }
.feature-text { flex: 1; }
.feature-visual { flex: 1; }
.feature-badge {
  display: inline-block; font-size: 13px; font-weight: 500; color: var(--primary);
  background: var(--primary-bg); padding: 4px 12px; border-radius: 4px; margin-bottom: 12px;
}
.feature-text h3 { font-size: 24px; font-weight: 600; margin-bottom: 12px; }
.feature-text p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.feature-tags span {
  padding: 4px 12px; background: var(--bg-surface);
  border-radius: 4px; font-size: 13px; font-weight: 400; color: var(--text-muted);
}
.visual-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); overflow: hidden; }
.visual-card.dark { background: #1a1a1a; border-color: rgba(255,255,255,0.06); }
.visual-card.dark .visual-header { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.06); color: rgba(255,255,255,0.5); }
.visual-card.dark .visual-body { color: rgba(255,255,255,0.9); }
.visual-header { display: flex; align-items: center; gap: 8px; padding: 10px 16px; background: var(--bg-surface); border-bottom: 1px solid var(--border); font-size: 13px; color: var(--text-muted); }
.visual-dot { width: 10px; height: 10px; border-radius: 50%; }
.visual-dot.red { background: #ff5f57; }
.visual-dot.yellow { background: #febc2e; }
.visual-dot.green { background: #28c840; }
.visual-body { padding: 16px 20px; }
.visual-item { display: flex; align-items: center; gap: 8px; padding: 8px 0; font-size: 14px; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.visual-item:last-child { border-bottom: none; }
.vi-icon { font-size: 16px; }
.vi-status { margin-left: auto; font-size: 12px; font-weight: 500; padding: 2px 8px; border-radius: 4px; }
.vi-status.done { color: #28c840; background: rgba(40,200,64,0.1); }
.vi-status.processing { color: #ff9500; background: rgba(255,149,0,0.1); }
.visual-search { padding: 10px 14px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08); border-radius: 8px; font-size: 14px; margin-bottom: 12px; color: rgba(255,255,255,0.9); }
.visual-result { padding: 8px 0; font-size: 13px; color: rgba(255,255,255,0.5); border-bottom: 1px solid rgba(255,255,255,0.05); }
.visual-result:last-child { border-bottom: none; }
.vr-score { display: inline-block; font-weight: 600; color: #28c840; margin-right: 8px; font-size: 12px; }
.chat-visual { display: flex; flex-direction: column; gap: 12px; }
.chat-msg { padding: 12px 16px; border-radius: 12px; font-size: 14px; line-height: 1.7; }
.chat-msg.user { background: var(--primary); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; max-width: 80%; }
.chat-msg.bot { background: var(--bg-surface); align-self: flex-start; max-width: 90%; }
.chat-memory { font-size: 11px; color: var(--primary); font-weight: 500; margin-bottom: 8px; }
.chat-ref { display: block; font-size: 11px; color: var(--text-muted); margin-top: 8px; }
.more-features { padding: 72px 0; background: var(--bg-surface); }
.mf-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.mf-card { background: var(--bg-card); border-radius: var(--radius); padding: 24px; transition: var(--transition); box-shadow: var(--shadow-sm); }
.mf-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.mf-icon { font-size: 24px; margin-bottom: 12px; }
.mf-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.mf-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ══ ARCHITECTURE ══ */
.arch-icon { font-size: 36px; margin-bottom: 12px; }
.arch-badge { display: inline-block; font-size: 12px; font-weight: 500; color: var(--primary); background: var(--primary-bg); padding: 3px 10px; border-radius: 4px; margin-bottom: 10px; }
.arch-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.arch-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 12px; }
.arch-card ul { margin: 0 0 16px 18px; font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
.arch-price { font-size: 20px; font-weight: 600; color: var(--primary); }
.tech-stack { padding: 72px 0; background: var(--bg-surface); }
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tech-item { background: var(--bg-card); border-radius: var(--radius); padding: 20px 24px; display: flex; flex-direction: column; gap: 4px; box-shadow: var(--shadow-sm); }
.tech-item strong { font-size: 14px; font-weight: 600; }
.tech-item span { font-size: 14px; color: var(--text-secondary); }

/* ══ FAQ ══ */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; transition: var(--transition); background: var(--bg-card); }
.faq-item[open] { box-shadow: var(--shadow-md); border-color: transparent; }
.faq-item summary { padding: 16px 20px; font-size: 16px; font-weight: 500; cursor: pointer; color: var(--text); list-style: none; display: flex; align-items: center; justify-content: space-between; transition: color .2s ease; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 20px; font-weight: 300; color: var(--text-muted); transition: var(--transition); }
.faq-item[open] summary::after { content: '−'; color: var(--primary); }
.faq-item[open] summary { color: var(--primary); }
.faq-item p { padding: 0 20px 16px; font-size: 15px; color: var(--text-secondary); line-height: 1.7; }

/* ══ SCROLL ANIMATIONS ══ */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity .5s ease, transform .5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ══ PRODUCT SCREENSHOT ══ */
.product-section { padding: 100px 0; background: #f0f2f8; }
.product-mockup {
  max-width: 900px; margin: 0 auto; border-radius: 12px; overflow: hidden;
  box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.mockup-browser { display: flex; align-items: center; gap: 12px; padding: 10px 16px; background: #f5f6f8; border-bottom: 1px solid var(--border); }
.mockup-dots { display: flex; gap: 6px; }
.mockup-dots span { width: 10px; height: 10px; border-radius: 50%; }
.mockup-dots span:nth-child(1) { background: #ff5f57; }
.mockup-dots span:nth-child(2) { background: #febc2e; }
.mockup-dots span:nth-child(3) { background: #28c840; }
.mockup-url { font-size: 12px; color: var(--text-muted); background: #fff; padding: 4px 14px; border-radius: 6px; border: 1px solid var(--border); flex: 1; max-width: 240px; }
.mockup-screen { display: flex; min-height: 360px; background: #fff; }
.mockup-sidebar { width: 200px; background: var(--bg-surface); border-right: 1px solid var(--border); padding: 16px 12px; flex-shrink: 0; }
.mockup-nav-item { padding: 8px 12px; border-radius: 6px; font-size: 14px; margin-bottom: 4px; cursor: default; color: var(--text-secondary); transition: var(--transition); }
.mockup-nav-item.active { background: var(--primary-bg); color: var(--primary); font-weight: 500; }
.mockup-main { flex: 1; padding: 20px 24px; display: flex; flex-direction: column; }
.mockup-chat { display: flex; flex-direction: column; gap: 14px; }
.mockup-msg { padding: 12px 16px; border-radius: 12px; font-size: 14px; line-height: 1.7; max-width: 85%; }
.mockup-msg.user { background: var(--primary); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.mockup-msg.bot { background: var(--bg-surface); color: var(--text); align-self: flex-start; border-bottom-left-radius: 4px; }
.mockup-msg-label { font-size: 11px; color: var(--primary); font-weight: 500; margin-bottom: 6px; }
.mockup-refs { font-size: 11px; color: var(--text-muted); margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); }

/* ══ USE CASES ══ */
.usecases-section { padding: 100px 0; background: #f8f9fc; }
.usecase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.usecase-card { background: #fff; border-radius: 16px; padding: 32px; transition: var(--transition); box-shadow: 0 2px 12px rgba(0,0,0,0.04); }
.usecase-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); transform: translateY(-4px); }
.usecase-icon { width: 48px; height: 48px; border-radius: 12px; background: linear-gradient(135deg, rgba(30,45,106,0.08), rgba(85,104,168,0.06)); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 18px; }
.usecase-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.usecase-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* ══ TRUST STRIP ══ */
.trust-section { padding: 60px 0; }
.trust-strip {
  display: flex; justify-content: center; align-items: center; gap: 44px;
  padding: 44px 56px; border-radius: 16px; flex-wrap: wrap;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 8px),
    linear-gradient(135deg, #253a80, #5568a8, #8868b0);
  color: #fff;
}
.trust-item { text-align: center; min-width: 100px; }
.trust-value { font-size: 36px; font-weight: 500; color: #fff; text-shadow: 0 0 20px rgba(255,255,255,0.2); }
.trust-label { font-size: 13px; color: rgba(255,255,255,0.5); margin-top: 4px; line-height: 1.5; }
.trust-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.15); }

/* ══ HIDDEN ELEMENTS ══ */
#star-canvas { display: none; }
.aurora { display: none; }

/* ══ RESPONSIVE ══ */
@media (max-width: 768px) {
  .hero-title { font-size: 30px; }
  .hero-download-btn { font-size: 16px; padding: 12px 32px; }
  .hero-platforms-bar { position: static; margin-top: 40px; flex-wrap: wrap; justify-content: center; }
  .hero-footer { position: static; margin-top: 20px; }
  .hero-copyright { position: static; margin-top: 8px; }
  .hero-metrics { gap: 24px; flex-wrap: wrap; }
  .metric-value { font-size: 28px; }
  .section-header h2 { font-size: 24px; }
  .feature-grid, .usecase-grid, .mf-grid, .tech-grid, .arch-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
  .footer-cols { flex-wrap: wrap; gap: 28px; }
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  .nav-links {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: linear-gradient(180deg, rgba(26,31,78,0.97), rgba(37,58,128,0.95));
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    padding: 8px 16px 12px; flex-direction: column; gap: 2px;
    border-bottom: 1px solid rgba(255,255,255,0.06); box-shadow: 0 12px 32px rgba(0,0,0,0.2);
  }
  .nav-links.show { display: flex; }
  .nav-links a { height: auto; padding: 10px 14px !important; border-radius: 8px !important; width: 100%; color: rgba(255,255,255,0.7) !important; }
  .nav-links a:hover { background: rgba(255,255,255,0.08) !important; color: #fff !important; }
  .nav-links .nav-cta { margin-top: 6px; justify-content: center; }
  .cta-card { padding: 40px 24px; }
  .cta-card h2 { font-size: 24px; }
  .why-card { flex-direction: column; }
  .mockup-sidebar { display: none; }
  .trust-strip { gap: 20px; padding: 24px; }
  .trust-divider { display: none; }
  .trust-value { font-size: 28px; }
  .feature-row, .feature-row.reverse { flex-direction: column; gap: 24px; }
  .feature-text h3 { font-size: 20px; }
}