/* ==========================================================================
   HAN BRO SHARED LINENS · Fengren Tech Official Site
   Design system — dark tech (Linear / Stripe style) + full animation suite
   ========================================================================== */

:root {
  /* palette */
  --bg-0: #06090f;
  --bg-1: #0a0f1c;
  --bg-2: #0e1626;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --line: rgba(148, 163, 184, 0.14);
  --line-strong: rgba(148, 163, 184, 0.24);
  --text: #e6edf7;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --accent-3: #22d3ee;
  --grad: linear-gradient(120deg, #38bdf8 0%, #22d3ee 45%, #818cf8 100%);
  --grad-soft: linear-gradient(120deg, rgba(56, 189, 248, 0.16), rgba(129, 140, 248, 0.16));
  --green: #34d399;
  --amber: #fbbf24;
  --rose: #fb7185;
  --gold: #d9b26a;

  /* metrics */
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 28px;
  --max-w: 1200px;
  --nav-h: 72px;
  --shadow-1: 0 10px 40px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 0 1px rgba(56, 189, 248, 0.18), 0 18px 60px -20px rgba(56, 189, 248, 0.35);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }
body {
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-0);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.en { letter-spacing: -0.01em; }
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .25s var(--ease); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
::selection { background: rgba(56, 189, 248, 0.3); color: #fff; }

/* scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: #22304a; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #2e4060; }

/* ---------- layout helpers ---------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }
.section { padding: 108px 0; position: relative; }
.section-tight { padding: 72px 0; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 64px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: .78rem; font-weight: 600; letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent); padding: 7px 16px; border-radius: 100px;
  background: var(--grad-soft); border: 1px solid rgba(56, 189, 248, 0.28);
  margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.section-title {
  font-size: clamp(1.9rem, 4vw, 3rem); font-weight: 800; line-height: 1.18;
  letter-spacing: -0.02em; margin-bottom: 18px;
}
.section-title .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.section-desc { font-size: 1.06rem; color: var(--text-dim); max-width: 640px; margin: 0 auto; }

/* ---------- buttons ---------- */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 13px 26px; border-radius: 100px; font-weight: 600; font-size: .95rem;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
  white-space: nowrap; overflow: hidden;
}
.btn-primary {
  color: #04101f; background: var(--grad);
  box-shadow: 0 8px 30px -10px rgba(56, 189, 248, 0.65);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -10px rgba(56, 189, 248, 0.8); }
.btn-ghost {
  color: var(--text); border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 10px 30px -14px rgba(56, 189, 248, 0.5); }
.btn-lg { padding: 16px 34px; font-size: 1.02rem; }
.btn .arrow { transition: transform .3s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }
.btn .ico-dl { transition: transform .3s var(--ease); }
.btn:hover .ico-dl { transform: translateY(3px); }

/* ---------- header / nav ---------- */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--nav-h);
  transition: background .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
  border-bottom: 1px solid transparent;
}
.header.scrolled {
  background: rgba(6, 9, 15, 0.72);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom-color: var(--line);
  box-shadow: 0 12px 40px -18px rgba(0, 0, 0, 0.7);
}
.header-inner { max-width: var(--max-w); margin: 0 auto; height: var(--nav-h); padding: 0 28px; display: flex; align-items: center; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 12px; object-fit: contain; display: block;
  box-shadow: 0 6px 20px -8px rgba(56, 189, 248, 0.55);
}
.brand-text { line-height: 1.15; }
.brand-name { font-size: 1.02rem; font-weight: 700; letter-spacing: .02em; }
.brand-sub { font-size: .62rem; color: var(--text-dim); letter-spacing: .16em; text-transform: uppercase; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-link {
  position: relative; display: inline-block; padding: 9px 15px; font-size: .92rem; font-weight: 500;
  color: var(--text-dim); border-radius: 10px;
}
.nav-link:hover { color: var(--text); }
.nav-link::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 4px; height: 2px;
  background: var(--grad); border-radius: 2px; transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }
.nav-link.active { color: var(--text); }
.lang-switch {
  display: flex; align-items: center; gap: 6px; margin-left: 6px;
  padding: 5px 6px; border: 1px solid var(--line); border-radius: 100px; background: rgba(255,255,255,0.02);
}
.lang-switch a { padding: 3px 10px; font-size: .8rem; font-weight: 600; color: var(--text-dim); border-radius: 100px; }
.lang-switch a.active { color: #04101f; background: var(--grad); }
.header-cta { margin-left: 6px; }
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.mobile-menu-btn span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s var(--ease); }
.mobile-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; padding: calc(var(--nav-h) + 40px) 0 80px; }
.hero-bg-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 75%);
}
.hero-blob { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; pointer-events: none; animation: blobFloat 16s ease-in-out infinite; }
.hero-blob-1 { width: 520px; height: 520px; top: -140px; right: -80px; background: radial-gradient(circle, rgba(56,189,248,.5), transparent 65%); }
.hero-blob-2 { width: 460px; height: 460px; bottom: -120px; left: -120px; background: radial-gradient(circle, rgba(129,140,248,.45), transparent 65%); animation-delay: -6s; }
.hero-blob-3 { width: 300px; height: 300px; top: 30%; left: 42%; background: radial-gradient(circle, rgba(34,211,238,.32), transparent 65%); animation-delay: -10s; }
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; width: 100%; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; border-radius: 100px;
  font-size: .82rem; font-weight: 500; color: var(--text-dim);
  border: 1px solid var(--line); background: rgba(255,255,255,0.03); margin-bottom: 26px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 12px var(--green); animation: pulse 2.2s infinite; }
.hero-title { font-size: clamp(2.4rem, 5.4vw, 4.2rem); font-weight: 800; line-height: 1.08; letter-spacing: -0.03em; margin-bottom: 26px; }
.hero-title .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: 1.12rem; color: var(--text-dim); max-width: 560px; margin-bottom: 34px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 46px; }
.hero-stats { display: flex; gap: 44px; flex-wrap: wrap; }
.hero-stat .num { font-size: 2.1rem; font-weight: 800; letter-spacing: -0.02em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-stat .lbl { font-size: .82rem; color: var(--text-dim); margin-top: 2px; }
.hero-visual { position: relative; display: grid; place-items: center; perspective: 1200px; }

/* ---------- device mockups ---------- */
.device { position: relative; border-radius: 22px; overflow: hidden; border: 1px solid var(--line-strong); background: linear-gradient(160deg, #101a2e, #0a1120); box-shadow: var(--shadow-1); }
.device::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(120% 80% at 50% 0%, rgba(56,189,248,.14), transparent 55%);
}
.device-screen { position: relative; z-index: 1; }
.device-cam { position: absolute; top: 8px; left: 50%; transform: translateX(-50%); width: 10px; height: 10px; border-radius: 50%; background: #0a1120; border: 1px solid #24344f; z-index: 2; }
.device-tilt { transform-style: preserve-3d; animation: deviceFloat 7s ease-in-out infinite; }
.device-pad { width: min(420px, 100%); aspect-ratio: 4 / 3; }
.device-gun {
  position: absolute; width: min(200px, 46%); aspect-ratio: 2.05 / 3.8;
  right: -4%; bottom: -8%; border-radius: 30px;
  animation: deviceFloat 8s ease-in-out infinite; animation-delay: -3s; z-index: 2;
}
.mock-ui { position: absolute; inset: 0; padding: 9% 8% 8%; display: flex; flex-direction: column; gap: 6%; z-index: 1; }
.mock-topbar { display: flex; justify-content: space-between; align-items: center; }
.mock-title { font-size: .72rem; font-weight: 700; color: #dbe7f6; }
.mock-pill { font-size: .56rem; color: var(--accent); border: 1px solid rgba(56,189,248,.4); padding: 2px 8px; border-radius: 100px; }
.mock-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6%; flex: 1; }
.mock-card { background: rgba(255,255,255,0.06); border: 1px solid var(--line); border-radius: 10px; padding: 8%; display: flex; flex-direction: column; gap: 6px; }
.mock-bar { height: 7px; border-radius: 6px; background: linear-gradient(90deg, rgba(56,189,248,.7), rgba(129,140,248,.5)); }
.mock-bar.short { width: 60%; }
.mock-bar.mid { width: 85%; opacity: .5; background: rgba(148,163,184,.35); }
.mock-bar.long { width: 70%; opacity: .35; background: rgba(148,163,184,.3); }
.mock-ring {
  width: 52%; aspect-ratio: 1; border-radius: 50%; margin: 4% auto;
  background: conic-gradient(from 0deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent));
  -webkit-mask: radial-gradient(circle, transparent 58%, #000 59%);
  mask: radial-gradient(circle, transparent 58%, #000 59%);
  animation: spinSlow 10s linear infinite;
}
.mock-lines { display: flex; flex-direction: column; gap: 7px; }
.ring-num { text-align: center; font-size: 1rem; font-weight: 800; color: #dbe7f6; margin-top: 2px; }
.ring-lbl { text-align: center; font-size: .52rem; color: var(--text-dim); }
.mock-scanline {
  position: absolute; left: 10%; right: 10%; height: 2px; z-index: 3;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow: 0 0 14px var(--accent); animation: scan 3.4s ease-in-out infinite; opacity: .85;
}
.gun-ui { position: absolute; inset: 0; padding: 14% 10% 10%; display: flex; flex-direction: column; gap: 7%; z-index: 1; }
.gun-top { font-size: .6rem; font-weight: 700; color: #dbe7f6; }
.gun-qr { width: 46%; aspect-ratio: 1; margin: 2% auto 0; border-radius: 10px; background: #fff; display: grid; place-items: center; }
.gun-qr svg { width: 82%; height: 82%; }
.gun-num { font-size: .86rem; font-weight: 800; text-align: center; color: #dbe7f6; letter-spacing: .06em; }
.gun-lbl { font-size: .5rem; text-align: center; color: var(--text-dim); }
.gun-btns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6%; margin-top: auto; }
.gun-btn { height: 20px; border-radius: 8px; background: var(--grad-soft); border: 1px solid rgba(56,189,248,.3); }
.float-chip {
  position: absolute; z-index: 3; display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-radius: 14px; font-size: .82rem; font-weight: 600;
  background: rgba(14, 22, 38, 0.85); border: 1px solid var(--line-strong);
  backdrop-filter: blur(12px); box-shadow: var(--shadow-1); animation: chipFloat 6s ease-in-out infinite;
}
.float-chip .ch-ico { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: var(--grad-soft); color: var(--accent); }
.float-chip small { display: block; font-weight: 500; font-size: .68rem; color: var(--text-dim); }
.chip-1 { top: 12%; left: -6%; }
.chip-2 { bottom: 18%; right: -4%; animation-delay: -2.5s; }
.chip-3 { top: 46%; right: -10%; animation-delay: -4.5s; }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .8s var(--ease), transform .8s var(--ease); will-change: opacity, transform; }
.reveal.in { opacity: 1; transform: none; }
.reveal-left { transform: translateX(-44px); }
.reveal-right { transform: translateX(44px); }
.reveal-scale { transform: scale(.9); }
.reveal-left.in, .reveal-right.in, .reveal-scale.in { transform: none; }
.d1 { transition-delay: .08s; } .d2 { transition-delay: .16s; } .d3 { transition-delay: .24s; }
.d4 { transition-delay: .32s; } .d5 { transition-delay: .4s; } .d6 { transition-delay: .48s; }

/* ---------- feature / info cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.card {
  position: relative; border-radius: var(--radius); padding: 30px 28px;
  background: var(--surface); border: 1px solid var(--line); overflow: hidden;
  transition: transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease), background .45s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56,189,248,.6), transparent);
  opacity: 0; transition: opacity .45s var(--ease);
}
.card:hover { transform: translateY(-8px); border-color: rgba(56,189,248,.4); box-shadow: var(--shadow-glow); background: var(--surface-2); }
.card:hover::before { opacity: 1; }
.card-ico {
  width: 54px; height: 54px; border-radius: 15px; display: grid; place-items: center;
  background: var(--grad-soft); color: var(--accent); margin-bottom: 20px;
  border: 1px solid rgba(56,189,248,0.25); transition: transform .45s var(--ease), color .45s var(--ease);
}
.card:hover .card-ico { transform: scale(1.08) rotate(-4deg); color: var(--accent-3); }
.card h3 { font-size: 1.12rem; font-weight: 700; margin-bottom: 10px; }
.card p { font-size: .92rem; color: var(--text-dim); }

/* stat strip */
.stats-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-cell { text-align: center; padding: 34px 20px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); position: relative; overflow: hidden; }
.stat-cell::after { content: ""; position: absolute; inset: auto 0 0 0; height: 2px; background: var(--grad); opacity: .6; transform: scaleX(0); transition: transform .6s var(--ease); }
.stat-cell:hover::after { transform: scaleX(1); }
.stat-cell .num { font-size: 2.5rem; font-weight: 800; letter-spacing: -0.02em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-cell .num::after { content: attr(data-suffix); font-size: 1.6rem; }
.stat-cell .lbl { font-size: .85rem; color: var(--text-dim); margin-top: 6px; }

/* ---------- marquee ---------- */
.marquee { position: relative; overflow: hidden; padding: 34px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255,255,255,0.015); }
.marquee-track { display: flex; gap: 60px; width: max-content; animation: marquee 26s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-item { display: flex; align-items: center; gap: 12px; font-size: 1.02rem; font-weight: 600; color: var(--text-faint); white-space: nowrap; }
.marquee-item .m-ico { color: var(--accent); opacity: .7; }
.marquee-fade { position: absolute; inset: 0; pointer-events: none; background: linear-gradient(90deg, var(--bg-0) 0%, transparent 12%, transparent 88%, var(--bg-0) 100%); }

/* ---------- timeline ---------- */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(180deg, var(--accent), var(--accent-2), transparent); }
.tl-item { position: relative; padding: 0 0 42px 26px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot { position: absolute; left: -34px; top: 6px; width: 18px; height: 18px; border-radius: 50%; background: var(--bg-0); border: 2px solid var(--accent); box-shadow: 0 0 0 4px rgba(56,189,248,.15), 0 0 16px rgba(56,189,248,.6); }
.tl-year { font-size: .8rem; font-weight: 700; color: var(--accent); letter-spacing: .08em; margin-bottom: 6px; }
.tl-item h3 { font-size: 1.12rem; font-weight: 700; margin-bottom: 6px; }
.tl-item p { font-size: .92rem; color: var(--text-dim); }

/* ---------- feature list (software) ---------- */
.feature-tag { display: inline-flex; align-items: center; gap: 7px; font-size: .8rem; color: var(--text-dim); border: 1px solid var(--line); border-radius: 100px; padding: 5px 13px; background: rgba(255,255,255,0.02); }
.feature-tag .ft { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.pill-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }

/* ---------- arch diagram ---------- */
.arch { position: relative; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 40px; background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent); overflow: hidden; }
.arch::before { content: ""; position: absolute; inset: 0; background: radial-gradient(60% 40% at 50% 0%, rgba(56,189,248,.12), transparent); pointer-events: none; }
.arch-center { display: grid; place-items: center; padding: 26px; margin-bottom: 34px; position: relative; }
.arch-core { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 24px 44px; border-radius: var(--radius); background: var(--grad-soft); border: 1px solid rgba(56,189,248,.35); box-shadow: var(--shadow-glow); }
.arch-core .ac-name { font-size: 1.2rem; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.arch-core .ac-sub { font-size: .78rem; color: var(--text-dim); letter-spacing: .14em; text-transform: uppercase; }
.arch-nodes { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; position: relative; }
.arch-node { text-align: center; padding: 20px 12px; border-radius: var(--radius-sm); background: var(--surface); border: 1px solid var(--line); transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease); }
.arch-node:hover { transform: translateY(-6px); border-color: rgba(56,189,248,.45); box-shadow: 0 14px 34px -16px rgba(56,189,248,.5); }
.arch-node .an-ico { width: 44px; height: 44px; margin: 0 auto 12px; border-radius: 12px; display: grid; place-items: center; background: var(--grad-soft); color: var(--accent); }
.arch-node .an-name { font-size: .9rem; font-weight: 700; }
.arch-node .an-sub { font-size: .7rem; color: var(--text-dim); margin-top: 2px; }
.arch-link {
  position: absolute; height: 1px; background: linear-gradient(90deg, transparent, rgba(56,189,248,.5), transparent);
  animation: pulseLine 3s ease-in-out infinite;
}

/* ---------- download page ---------- */
.dl-hero { position: relative; padding: calc(var(--nav-h) + 70px) 0 40px; overflow: hidden; text-align: center; }
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; max-width: 900px; margin: 0 auto; }
.dl-card {
  position: relative; border-radius: var(--radius-lg); padding: 40px 36px; overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
  border: 1px solid var(--line); transition: transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease);
}
.dl-card:hover { transform: translateY(-8px); border-color: rgba(56,189,248,.45); box-shadow: var(--shadow-glow); }
.dl-card .blob { position: absolute; width: 220px; height: 220px; border-radius: 50%; filter: blur(70px); opacity: .28; pointer-events: none; }
.dl-card.pad-card .blob { background: radial-gradient(circle, var(--accent), transparent 70%); top: -60px; right: -40px; }
.dl-card.gun-card .blob { background: radial-gradient(circle, var(--accent-2), transparent 70%); bottom: -60px; left: -40px; }
.dl-top { display: flex; align-items: center; gap: 18px; margin-bottom: 22px; position: relative; }
.dl-ico { width: 62px; height: 62px; border-radius: 18px; display: grid; place-items: center; background: var(--grad-soft); border: 1px solid rgba(56,189,248,.3); color: var(--accent); flex-shrink: 0; }
.dl-title { font-size: 1.35rem; font-weight: 800; letter-spacing: -0.01em; }
.dl-en { font-size: .72rem; color: var(--text-dim); letter-spacing: .14em; text-transform: uppercase; }
.dl-badge { display: inline-flex; align-items: center; gap: 7px; font-size: .78rem; font-weight: 600; color: var(--green); background: rgba(52, 211, 153, 0.12); border: 1px solid rgba(52,211,153,.3); padding: 4px 12px; border-radius: 100px; }
.dl-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); animation: pulse 2s infinite; }
.dl-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; margin: 22px 0 26px; position: relative; }
.dl-meta div { background: rgba(255,255,255,0.03); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.dl-meta .k { font-size: .72rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: .08em; }
.dl-meta .v { font-size: 1rem; font-weight: 700; margin-top: 2px; }
.dl-meta .v.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.dl-desc { position: relative; font-size: .9rem; color: var(--text-dim); background: rgba(255,255,255,0.02); border-left: 3px solid var(--accent); border-radius: 8px; padding: 14px 16px; margin-bottom: 26px; }
.dl-desc .changelog { margin-top: 10px; font-size: .84rem; color: var(--text-faint); line-height: 1.9; }
.dl-actions { display: flex; gap: 14px; flex-wrap: wrap; position: relative; }
.dl-loading { text-align: center; color: var(--text-dim); padding: 60px 0; }
.dl-loading .spin { width: 34px; height: 34px; margin: 0 auto 16px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--accent); animation: spinSlow 1s linear infinite; }
.dl-note { max-width: 640px; margin: 46px auto 0; text-align: center; font-size: .85rem; color: var(--text-faint); }
.dl-note a { color: var(--accent); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; max-width: 900px; margin: 44px auto 0; }
.step { text-align: center; padding: 24px 18px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); }
.step .s-num { width: 40px; height: 40px; margin: 0 auto 14px; border-radius: 12px; display: grid; place-items: center; font-weight: 800; color: #04101f; background: var(--grad); box-shadow: 0 8px 22px -8px rgba(56,189,248,.7); }
.step h4 { font-size: .98rem; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: .82rem; color: var(--text-dim); }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-card { display: flex; gap: 18px; padding: 22px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); transition: transform .35s var(--ease), border-color .35s var(--ease); }
.contact-card:hover { transform: translateY(-4px); border-color: rgba(56,189,248,.4); }
.contact-card .cc-ico { width: 50px; height: 50px; flex-shrink: 0; border-radius: 14px; display: grid; place-items: center; background: var(--grad-soft); color: var(--accent); }
.contact-card h4 { font-size: 1.02rem; font-weight: 700; }
.contact-card .cc-en { font-size: .7rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 6px; }
.contact-card p { font-size: .9rem; color: var(--text-dim); }
.contact-card a.phone { display: block; margin-top: 8px; font-size: 1.35rem; font-weight: 800; color: var(--text); letter-spacing: .02em; }
.contact-card a.phone:hover { color: var(--accent); }
.form { border-radius: var(--radius-lg); padding: 36px; border: 1px solid var(--line); background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent); }
.form h3 { font-size: 1.3rem; font-weight: 800; margin-bottom: 6px; }
.form p { font-size: .9rem; color: var(--text-dim); margin-bottom: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .82rem; font-weight: 600; color: var(--text-dim); margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 16px; border-radius: 12px; color: var(--text);
  background: rgba(255,255,255,0.04); border: 1px solid var(--line);
  font: inherit; font-size: .95rem; transition: border-color .3s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(56,189,248,.18); background: rgba(255,255,255,0.06); }
.field textarea { resize: vertical; min-height: 110px; }
.form-msg { margin-top: 14px; font-size: .9rem; }
.form-msg.ok { color: var(--green); }
.form-msg.err { color: var(--rose); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); background: linear-gradient(180deg, transparent, rgba(10,15,28,.6)); padding: 70px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 44px; padding-bottom: 50px; }
.footer .brand { margin-bottom: 16px; }
.footer-desc { font-size: .9rem; color: var(--text-dim); max-width: 320px; }
.footer-title { font-size: .9rem; font-weight: 700; letter-spacing: .06em; margin-bottom: 18px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: .88rem; color: var(--text-dim); }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: .88rem; color: var(--text-dim); margin-bottom: 12px; }
.footer-contact .fc-ico { color: var(--accent); flex-shrink: 0; margin-top: 3px; }
.footer-bottom { border-top: 1px solid var(--line); padding: 22px 0; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: .82rem; color: var(--text-faint); }
.footer-bottom a { color: var(--text-dim); }

/* ---------- page hero (inner pages) ---------- */
.page-hero { position: relative; padding: calc(var(--nav-h) + 70px) 0 54px; overflow: hidden; text-align: center; }
.page-hero .hero-bg-grid { opacity: .8; }
.page-hero .title { font-size: clamp(2rem, 4.6vw, 3.2rem); font-weight: 800; letter-spacing: -0.02em; position: relative; }
.page-hero .title .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-hero .desc { max-width: 640px; margin: 18px auto 0; color: var(--text-dim); font-size: 1.05rem; position: relative; }

/* ---------- keyframes ---------- */
@keyframes blobFloat { 0%, 100% { transform: translate(0, 0) scale(1); } 33% { transform: translate(40px, -30px) scale(1.08); } 66% { transform: translate(-30px, 24px) scale(.95); } }
@keyframes deviceFloat { 0%, 100% { transform: translateY(0) rotateX(8deg) rotateY(-6deg); } 50% { transform: translateY(-18px) rotateX(5deg) rotateY(-3deg); } }
@keyframes chipFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes spinSlow { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .45; transform: scale(.8); } }
@keyframes scan { 0% { top: 12%; } 50% { top: 86%; } 100% { top: 12%; } }
@keyframes pulseLine { 0%, 100% { opacity: .3; } 50% { opacity: 1; } }
@keyframes shimmer { to { background-position: 200% center; } }
@keyframes gradientShift { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }

.grad-text-anim { background: linear-gradient(90deg, #38bdf8, #22d3ee, #818cf8, #38bdf8); background-size: 200% auto; -webkit-background-clip: text; background-clip: text; color: transparent; animation: shimmer 6s linear infinite; }

/* ---------- back-to-top ---------- */
.to-top { position: fixed; right: 26px; bottom: 26px; z-index: 90; width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; background: rgba(14,22,38,.85); border: 1px solid var(--line-strong); color: var(--accent); backdrop-filter: blur(10px); opacity: 0; pointer-events: none; transform: translateY(14px); transition: opacity .3s var(--ease), transform .3s var(--ease); box-shadow: var(--shadow-1); }
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { color: #fff; border-color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .arch-nodes { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .hero-inner { grid-template-columns: 1fr; gap: 60px; }
  .hero-visual { order: -1; }
  .device-pad { width: min(360px, 90%); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .nav-list { display: none; }
  .mobile-menu-btn { display: flex; }
  .nav-list.mobile-open { display: flex; position: fixed; inset: var(--nav-h) 0 auto 0; flex-direction: column; align-items: stretch; gap: 2px; padding: 18px 22px 26px; background: rgba(6,9,15,.96); backdrop-filter: blur(20px); border-bottom: 1px solid var(--line); }
  .nav-list.mobile-open .nav-link { padding: 14px 16px; font-size: 1.02rem; border-radius: 12px; }
  .nav-list.mobile-open .nav-link:hover { background: rgba(255,255,255,0.04); }
  .header-cta { display: none; }
  .dl-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .hero-stats { gap: 26px; }
  .stats-band { grid-template-columns: 1fr 1fr; gap: 14px; }
  .dl-meta { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .arch-nodes { grid-template-columns: 1fr 1fr; }
  .float-chip { display: none; }
  .chip-1, .chip-2, .chip-3 { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001s !important; animation-iteration-count: 1 !important; transition-duration: .2s !important; }
  .reveal { opacity: 1; transform: none; }
}
/* ---------- mobile adaptation v2 ---------- */
html, body { overflow-x: hidden; }
.hero { min-height: 100svh; }
.form input, .form select, .form textarea { font-size: 16px; }

@media (max-width: 860px) {
  :root { --nav-h: 60px; }
  .container { padding: 0 20px; }
  .header-inner { padding: 0 16px; gap: 10px; }
  .section { padding: 72px 0; }
  .section-tight { padding: 52px 0; }
  .hero { padding: calc(var(--nav-h) + 48px) 0 56px; }
  .hero-inner { gap: 40px; }
  .device-pad { width: min(300px, 76%); }
  .arch { padding: 24px 16px; }
  .arch-center { padding: 14px; margin-bottom: 22px; }
  .arch-core { padding: 18px 26px; }
  .dl-hero { padding: calc(var(--nav-h) + 44px) 0 30px; }
  .page-hero { padding-top: calc(var(--nav-h) + 44px); }
  .nav-list.mobile-open { max-height: calc(100vh - var(--nav-h)); overflow-y: auto; }
}

@media (max-width: 560px) {
  :root { --nav-h: 56px; }
  .container { padding: 0 16px; }
  .section { padding: 56px 0; }
  .section-tight { padding: 44px 0; }
  .header-inner { padding: 0 12px; gap: 8px; }
  .brand { gap: 8px; }
  .brand-mark { width: 32px; height: 32px; border-radius: 9px; }
  .brand-name { font-size: .84rem; letter-spacing: 0; white-space: nowrap; }
  .brand-sub { display: none; }
  .lang-switch { margin-left: auto; }
  .lang-switch a { padding: 3px 7px; font-size: .72rem; }
  .mobile-menu-btn { padding: 8px; }
  .hero { padding: calc(var(--nav-h) + 36px) 0 44px; }
  .hero-title { font-size: clamp(1.9rem, 8.4vw, 2.4rem); margin-bottom: 18px; }
  .hero-stats { gap: 18px 26px; }
  .device-pad { width: min(220px, 60%); }
  .section-title { font-size: clamp(1.45rem, 6vw, 1.9rem); }
  .section-desc, .desc { font-size: .93rem; }
  .btn-lg { padding: 14px 24px; font-size: .96rem; }
  .dl-actions .btn, .form .btn { width: 100%; justify-content: center; text-align: center; }
  .card { padding: 20px 16px; }
  .stat-cell { padding: 22px 12px; }
  .stat-cell .num { font-size: 1.9rem; }
  .arch-node { padding: 14px 8px; }
  .arch-node .an-name { font-size: .8rem; }
  .timeline { padding-left: 26px; }
  .contact-card { padding: 16px; gap: 14px; }
  .contact-card .cc-ico { width: 42px; height: 42px; border-radius: 11px; }
  .step { padding: 18px 14px; }
  .to-top { right: 14px; bottom: 14px; width: 44px; height: 44px; border-radius: 12px; }
  .marquee-track { gap: 34px; }
  .pill-row { gap: 8px; }
  .feature-tag { font-size: .74rem; padding: 4px 10px; }
  .dl-card { padding: 22px 16px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}