/* ============================================================
   NeuraCompute — AI Compute Platform (iOS-first H5)
   Bright glassmorphism style · mobile-first · iOS Safari tuned
   ============================================================ */
:root {
  --bg: #f5f7ff;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-solid: #ffffff;
  --ink: #101431;
  --ink-soft: #4d5578;
  --ink-faint: #8a90b0;
  --line: rgba(16, 20, 49, 0.08);
  --primary: #6366f1;
  --primary-deep: #4f46e5;
  --violet: #8b5cf6;
  --cyan: #22d3ee;
  --mint: #10b981;
  --amber: #f59e0b;
  --rose: #f43f5e;
  --grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 55%, #22d3ee 130%);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --shadow-soft: 0 18px 40px rgba(99, 102, 241, 0.12);
  --shadow-card: 0 10px 26px rgba(31, 38, 92, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(46rem 30rem at 88% -10%, rgba(139, 92, 246, 0.16), transparent 62%),
    radial-gradient(40rem 26rem at -8% 2%, rgba(34, 211, 238, 0.14), transparent 60%),
    var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
img, svg, video { display: block; max-width: 100%; }
::selection { background: rgba(99, 102, 241, 0.22); }

.wrap { max-width: 46rem; margin: 0 auto; padding: 0 1.1rem; }

/* ---------- Glass topbar ---------- */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  padding: env(safe-area-inset-top) 0 0;
  background: rgba(255, 255, 255, 0.68);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 46rem; margin: 0 auto;
  padding: 0.6rem 1.1rem;
  display: flex; align-items: center; justify-content: space-between; gap: 0.6rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 800; font-size: 1.05rem; letter-spacing: -0.01em; }
.brand .logo-mark { width: 1.7rem; height: 1.7rem; border-radius: 10px; background: var(--grad); display: flex; align-items: center; justify-content: center; color: #fff; flex: 0 0 auto; }
.brand .logo-mark svg { width: 1rem; height: 1rem; }
.brand small { display: block; color: var(--ink-faint); font-size: 0.64rem; font-weight: 600; line-height: 1.1; letter-spacing: 0.02em; }
nav.links { display: flex; gap: 0.15rem; overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
nav.links::-webkit-scrollbar { display: none; }
nav.links a { padding: 0.45rem 0.62rem; border-radius: 999px; font-size: 0.86rem; font-weight: 600; color: var(--ink-soft); white-space: nowrap; transition: background .15s ease, color .15s ease; }
nav.links a:hover, nav.links a:active { background: rgba(99, 102, 241, 0.12); color: var(--primary-deep); }

/* ---------- Hero ---------- */
.hero { padding: calc(4.9rem + env(safe-area-inset-top)) 0 2.2rem; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.42rem;
  padding: 0.34rem 0.85rem; border-radius: 999px;
  background: rgba(99, 102, 241, 0.1); color: var(--primary-deep);
  font-size: 0.76rem; font-weight: 700; letter-spacing: 0.06em;
}
.hero-badge .live-dot { position: relative; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); flex: 0 0 auto; }
.hero-badge .live-dot::after { content: ""; position: absolute; inset: 0; border-radius: 50%; background: var(--mint); animation: pulse-ring 2s infinite; }
@keyframes pulse-ring { 0% { transform: scale(1); opacity: 0.65; } 100% { transform: scale(2.8); opacity: 0; } }
.hero h1 { font-size: clamp(2.05rem, 6.4vw, 3.1rem); line-height: 1.16; letter-spacing: -0.03em; margin: 0.9rem 0 0.7rem; font-weight: 800; }
.hero h1 .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent; }
.hero-sub { color: var(--ink-soft); font-size: 1.02rem; max-width: 34rem; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.1rem; }
.chip { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.44rem 0.85rem; border-radius: 999px; background: var(--surface-solid); border: 1px solid var(--line); box-shadow: 0 4px 14px rgba(31,38,92,.06); font-size: 0.82rem; font-weight: 600; color: var(--ink-soft); }
.chip b { color: var(--primary-deep); }

/* Video showcase */
.video-card {
  position: relative; margin-top: 1.6rem; border-radius: var(--radius-lg);
  overflow: hidden; background: #0b1030;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 255, 255, 0.18);
}
.video-card video { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #0b1030; }
.video-glow { position: absolute; inset: 0; pointer-events: none; background: linear-gradient(180deg, rgba(139,92,246,0.14), transparent 42%); }
.video-badges { position: absolute; left: 0.9rem; bottom: 0.9rem; display: flex; flex-wrap: wrap; gap: 0.45rem; z-index: 2; }
.vbadge { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.3rem 0.72rem; border-radius: 999px; background: rgba(11, 16, 48, 0.55); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); color: #e7e9ff; font-size: 0.74rem; font-weight: 600; }
.vbadge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); }

/* ---------- Sections ---------- */
section.block { padding: 2.4rem 0 0.4rem; }
.sec-head { text-align: left; padding-bottom: 1.15rem; }
.sec-head .kicker { font-size: 0.74rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; color: var(--primary); }
.sec-head h2 { font-size: 1.62rem; letter-spacing: -0.02em; margin: 0.35rem 0 0.3rem; font-weight: 800; line-height: 1.25; }
.sec-head p { color: var(--ink-soft); font-size: 0.95rem; max-width: 38rem; }
.sec-head.center { text-align: center; }
.sec-head.center p { margin: 0 auto; }

.card {
  background: var(--surface);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

/* ---------- KPI data band (dynamic) ---------- */
.kpi-band { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-top: 1.6rem; }
.kpi { padding: 1rem 1.05rem; }
.kpi .k-label { font-size: 0.78rem; font-weight: 600; color: var(--ink-faint); display: flex; align-items: center; gap: 0.3rem; }
.kpi .k-value { font-size: 1.55rem; font-weight: 800; letter-spacing: -0.02em; margin-top: 0.15rem; }
.kpi .k-value em { font-style: normal; font-size: 1rem; color: var(--ink-soft); }
.kpi .k-trend { font-size: 0.76rem; font-weight: 600; color: var(--mint); margin-top: 0.05rem; }
.kpi .k-trend.down { color: var(--rose); }

/* ---------- Dynamic chart ---------- */
.chart-card { padding: 1.25rem 1.15rem 1.15rem; margin-top: 0.75rem; }
.chart-head { display: flex; align-items: baseline; justify-content: space-between; gap: 0.6rem; margin-bottom: 0.7rem; }
.chart-head h3 { font-size: 1.02rem; }
.chart-head span { font-size: 0.76rem; color: var(--ink-faint); }
.chart-svg { width: 100%; height: auto; }
.chart-bars { display: flex; align-items: flex-end; gap: 0.5rem; height: 150px; padding: 0.4rem 0.1rem 0; }
.cbar { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 0.3rem; height: 100%; justify-content: flex-end; }
.cbar .bar { width: 100%; max-width: 2.6rem; border-radius: 8px 8px 4px 4px; background: linear-gradient(180deg, #22d3ee, #6366f1); transform-origin: bottom; transform: scaleY(0); transition: transform .8s cubic-bezier(.2,.7,.3,1); }
.cbar .bar.b2 { background: linear-gradient(180deg, #a78bfa, #8b5cf6); }
.cbar .bar.b3 { background: linear-gradient(180deg, #6ee7b7, #10b981); }
.cbar .bar-label { font-size: 0.68rem; color: var(--ink-faint); font-weight: 600; }
.chart-note { margin-top: 0.8rem; padding-top: 0.7rem; border-top: 1px dashed var(--line); font-size: 0.78rem; color: var(--ink-faint); }

/* ---------- Scenario grid ---------- */
.scene-grid { display: grid; grid-template-columns: 1fr; gap: 0.8rem; }
.scene { padding: 1.05rem 1.1rem; display: flex; gap: 0.9rem; align-items: flex-start; }
.scene .s-ico { flex: 0 0 auto; width: 2.9rem; height: 2.9rem; border-radius: 15px; display: flex; align-items: center; justify-content: center; color: #fff; background: var(--grad); box-shadow: 0 8px 18px rgba(99,102,241,.28); }
.scene .s-ico svg { width: 1.45rem; height: 1.45rem; }
.scene:nth-child(3n+2) .s-ico { background: linear-gradient(135deg, #22d3ee, #0ea5e9); box-shadow: 0 8px 18px rgba(34,211,238,.28); }
.scene:nth-child(3n+3) .s-ico { background: linear-gradient(135deg, #10b981, #0d9488); box-shadow: 0 8px 18px rgba(16,185,129,.26); }
.scene h3 { font-size: 1.03rem; margin-bottom: 0.12rem; }
.scene p { font-size: 0.88rem; color: var(--ink-soft); }
.scene .s-meta { display: inline-flex; align-items: center; gap: 0.3rem; margin-top: 0.45rem; font-size: 0.76rem; font-weight: 700; color: var(--primary-deep); background: rgba(99,102,241,.09); padding: 0.2rem 0.55rem; border-radius: 999px; }

/* ---------- Crypto market ---------- */
.crypto-card { overflow: hidden; }
.crypto-head { padding: 1.2rem 1.15rem 0.9rem; display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }
.crypto-head h3 { font-size: 1.06rem; display: flex; align-items: center; gap: 0.45rem; }
.crypto-head .price { text-align: right; }
.crypto-head .price b { font-size: 1.35rem; letter-spacing: -0.02em; display: block; line-height: 1.1; }
.crypto-head .price span { font-size: 0.78rem; font-weight: 700; color: var(--mint); }
.crypto-tabs { display: flex; gap: 0.4rem; padding: 0 1.15rem 0.9rem; overflow-x: auto; scrollbar-width: none; }
.crypto-tabs::-webkit-scrollbar { display: none; }
.ctab { padding: 0.42rem 0.85rem; border-radius: 999px; font-size: 0.8rem; font-weight: 700; color: var(--ink-soft); background: rgba(99,102,241,.08); white-space: nowrap; transition: all .18s ease; }
.ctab.active { background: var(--grad); color: #fff; box-shadow: 0 6px 16px rgba(99,102,241,.3); }
.crypto-body { padding: 0 1.15rem 1.2rem; }
.crypto-chart-wrap { border-radius: var(--radius-sm); background: linear-gradient(180deg, rgba(99,102,241,.06), rgba(34,211,238,.04)); padding: 0.4rem; }
.crypto-chart-wrap svg { width: 100%; height: auto; }
.crypto-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; margin-top: 0.8rem; }
.cstat { background: rgba(99,102,241,.07); border-radius: var(--radius-sm); padding: 0.7rem 0.55rem; text-align: center; }
.cstat b { display: block; font-size: 1.02rem; letter-spacing: -0.01em; }
.cstat span { font-size: 0.7rem; color: var(--ink-faint); font-weight: 600; }
.crypto-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; margin-top: 0.9rem; }
.flow-step { text-align: center; padding: 0.6rem 0.3rem; border-radius: var(--radius-sm); background: var(--surface-solid); border: 1px solid var(--line); }
.flow-step .f-ico { width: 1.7rem; height: 1.7rem; margin: 0 auto 0.3rem; border-radius: 9px; background: rgba(245,158,11,.14); color: #b45309; display: flex; align-items: center; justify-content: center; }
.flow-step .f-ico svg { width: 0.95rem; height: 0.95rem; }
.flow-step b { display: block; font-size: 0.78rem; }
.flow-step span { font-size: 0.64rem; color: var(--ink-faint); }
.crypto-apps { display: grid; gap: 0.6rem; margin-top: 0.9rem; }
.capp { display: flex; gap: 0.7rem; align-items: center; padding: 0.8rem 0.85rem; background: var(--surface-solid); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.capp .a-ico { flex: 0 0 auto; width: 2.2rem; height: 2.2rem; border-radius: 11px; background: var(--amber-soft, #fdf3e0); color: #b45309; display: flex; align-items: center; justify-content: center; }
.capp .a-ico svg { width: 1.15rem; height: 1.15rem; }
.capp:nth-child(2) .a-ico { background: rgba(99,102,241,.12); color: var(--primary-deep); }
.capp:nth-child(3) .a-ico { background: rgba(16,185,129,.14); color: #047857; }
.capp:nth-child(4) .a-ico { background: rgba(34,211,238,.14); color: #0369a1; }
.capp b { display: block; font-size: 0.92rem; }
.capp span { font-size: 0.78rem; color: var(--ink-soft); }

/* ---------- Infrastructure ---------- */
.infra-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.infra { padding: 1rem 1rem 1.05rem; }
.infra .i-art { border-radius: var(--radius-sm); overflow: hidden; background: linear-gradient(160deg, #0d1230, #080b22); margin-bottom: 0.8rem; }
.infra .i-art svg { width: 100%; height: auto; }
.infra h3 { font-size: 0.98rem; }
.infra p { font-size: 0.8rem; color: var(--ink-soft); margin-top: 0.1rem; }

/* ---------- Service ladder ---------- */
.ladder { display: grid; gap: 0.6rem; }
.lstep { display: flex; align-items: center; gap: 0.9rem; padding: 0.9rem 1rem; }
.lstep .lv { flex: 0 0 auto; width: 2.1rem; height: 2.1rem; border-radius: 11px; background: var(--grad); color: #fff; font-weight: 800; font-size: 0.9rem; display: flex; align-items: center; justify-content: center; }
.lstep .lv.l2 { background: linear-gradient(135deg, #22d3ee, #6366f1); }
.lstep .lv.l3 { background: linear-gradient(135deg, #a78bfa, #8b5cf6); }
.lstep .lv.l4 { background: linear-gradient(135deg, #6ee7b7, #10b981); }
.lstep .body { flex: 1; }
.lstep .body h3 { font-size: 0.98rem; }
.lstep .body p { font-size: 0.8rem; color: var(--ink-soft); }
.lstep .traits { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.lstep .trait { font-size: 0.7rem; font-weight: 700; color: var(--ink-soft); background: rgba(16,20,49,.05); padding: 0.18rem 0.5rem; border-radius: 999px; }

/* ---------- Planner (closed loop) ---------- */
.planner-card { padding: 1.25rem 1.15rem 1.3rem; }
.planner-steps { display: grid; gap: 0.8rem; }
.pstep { border: 1.5px solid var(--line); border-radius: var(--radius-md); padding: 0.95rem 1rem; transition: border-color .18s ease; }
.pstep.active { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(99,102,241,.1); }
.pstep .p-q { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.55rem; display: flex; align-items: center; gap: 0.5rem; }
.pstep .p-num { width: 1.35rem; height: 1.35rem; border-radius: 50%; background: rgba(99,102,241,.12); color: var(--primary-deep); font-size: 0.74rem; font-weight: 800; display: flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.p-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 0.45rem; }
.popt { padding: 0.58rem 0.4rem; border-radius: 12px; border: 1px solid var(--line); background: var(--surface-solid); font-size: 0.82rem; font-weight: 600; color: var(--ink-soft); transition: all .15s ease; text-align: center; }
.popt.sel { border-color: var(--primary); background: rgba(99,102,241,.1); color: var(--primary-deep); }
.popt:active { transform: scale(0.97); }
.rec-box { margin-top: 1rem; border-radius: var(--radius-md); background: linear-gradient(135deg, rgba(99,102,241,.1), rgba(34,211,238,.08)); border: 1px solid rgba(99,102,241,.25); padding: 1rem 1.05rem; }
.rec-box .rec-label { font-size: 0.72rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; color: var(--primary); }
.rec-box h3 { font-size: 1.25rem; margin: 0.3rem 0 0.2rem; }
.rec-box .rec-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; margin: 0.55rem 0; }
.rec-meta div span { display: block; font-size: 0.7rem; color: var(--ink-faint); font-weight: 600; }
.rec-meta div b { font-size: 0.9rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem;
  border-radius: 999px; padding: 0.8rem 1.5rem; font-size: 0.94rem; font-weight: 700;
  transition: transform .15s ease, box-shadow .15s ease; min-height: 44px;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 12px 26px rgba(99,102,241,.34); }
.btn-primary:hover { box-shadow: 0 16px 32px rgba(99,102,241,.42); }
.btn-block { width: 100%; }

/* ---------- Form modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(16, 20, 49, 0.42);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  display: none; align-items: flex-end; justify-content: center;
}
.modal-backdrop.open { display: flex; }
.modal-sheet {
  width: 100%; max-width: 46rem;
  background: var(--surface-solid); border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 1.3rem 1.2rem calc(1.3rem + env(safe-area-inset-bottom));
  box-shadow: 0 -18px 50px rgba(16,20,49,.18);
  transform: translateY(100%); transition: transform .3s cubic-bezier(.2,.8,.2,1);
}
.modal-backdrop.open .modal-sheet { transform: translateY(0); }
.modal-sheet h3 { font-size: 1.12rem; margin-bottom: 0.2rem; }
.modal-sheet .m-sub { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 1rem; }
.field { margin-bottom: 0.8rem; }
.field label { display: block; font-size: 0.8rem; font-weight: 700; margin-bottom: 0.3rem; }
.field input, .field textarea {
  width: 100%; padding: 0.72rem 0.9rem; border-radius: 14px; border: 1.5px solid var(--line);
  background: #fbfcff; font-family: inherit; font-size: 0.92rem; color: var(--ink);
  -webkit-appearance: none; appearance: none;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(99,102,241,.12); }
.field textarea { min-height: 5rem; resize: vertical; }
.toast {
  position: fixed; left: 50%; bottom: calc(1.4rem + env(safe-area-inset-bottom)); z-index: 99;
  transform: translate(-50%, 130%); opacity: 0;
  background: #0f172a; color: #fff; font-size: 0.88rem; font-weight: 600;
  padding: 0.85rem 1.25rem; border-radius: 999px; box-shadow: 0 14px 34px rgba(15,23,42,.35);
  display: flex; align-items: center; gap: 0.5rem;
  transition: transform .3s ease, opacity .3s ease;
  max-width: calc(100vw - 2.4rem); text-align: center;
}
.toast.show { transform: translate(-50%, 0); opacity: 1; }
.toast .t-ico { width: 1.15rem; height: 1.15rem; border-radius: 50%; background: var(--mint); color: #fff; display: flex; align-items: center; justify-content: center; flex: 0 0 auto; font-size: 0.7rem; }

/* ---------- CTA & footer ---------- */
.cta-card { border-radius: var(--radius-lg); background: var(--grad); color: #fff; padding: 1.9rem 1.4rem; text-align: center; box-shadow: var(--shadow-soft); }
.cta-card h2 { font-size: 1.55rem; letter-spacing: -0.02em; }
.cta-card p { font-size: 0.92rem; opacity: 0.9; margin: 0.4rem auto 1.1rem; max-width: 30rem; }
.btn-ghost-light { display: inline-flex; align-items: center; gap: 0.4rem; border-radius: 999px; padding: 0.8rem 1.5rem; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.4); color: #fff; font-weight: 700; font-size: 0.94rem; min-height: 44px; }
.btn-ghost-light:active { transform: scale(0.98); }
footer.site { padding: 1.8rem 1.1rem calc(1.6rem + env(safe-area-inset-bottom)); text-align: center; color: var(--ink-faint); font-size: 0.78rem; }
footer.site p { margin: 0.2rem 0; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (min-width: 640px) {
  .kpi-band { grid-template-columns: repeat(4, 1fr); }
  .scene-grid { grid-template-columns: 1fr 1fr; }
  .infra-grid { grid-template-columns: repeat(4, 1fr); }
  .p-opts { grid-template-columns: repeat(4, 1fr); }
  .crypto-apps { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .cbar .bar { transform: scaleY(1); }
}

@media print {
  body { background: #fff; }
  .topbar, .video-card, .modal-backdrop, .toast, .cta-card, footer.site { display: none; }
  .card { box-shadow: none; }
  .cbar .bar { transform: scaleY(1); }
}

/* ---------- Language switcher ---------- */
nav.links { flex: 1 1 auto; min-width: 0; }
.lang-wrap { position: relative; flex: 0 0 auto; }
.lang-btn { min-width: 3rem; height: 2.35rem; padding: 0 0.7rem; border-radius: 999px; background: rgba(99, 102, 241, 0.1); border: 1px solid rgba(99, 102, 241, 0.25); color: var(--primary-deep); font-size: 0.82rem; font-weight: 800; letter-spacing: 0.04em; transition: background .15s ease, transform .15s ease; }
.lang-btn:active { transform: scale(0.96); background: rgba(99, 102, 241, 0.18); }
.lang-menu { position: absolute; top: calc(100% + 0.55rem); right: 0; z-index: 60; min-width: 10.5rem; padding: 0.4rem; border-radius: var(--radius-md); background: var(--surface-solid); border: 1px solid var(--line); box-shadow: var(--shadow-card); display: none; }
.lang-menu.open { display: block; }
.lang-opt { display: flex; align-items: center; justify-content: space-between; width: 100%; padding: 0.55rem 0.8rem; border-radius: 12px; font-size: 0.88rem; font-weight: 600; color: var(--ink-soft); transition: background .15s ease, color .15s ease; }
.lang-opt:hover, .lang-opt:active { background: rgba(99, 102, 241, 0.1); color: var(--primary-deep); }
.lang-opt.sel { background: rgba(99, 102, 241, 0.14); color: var(--primary-deep); font-weight: 800; }
.lang-opt .code { font-size: 0.68rem; font-weight: 800; letter-spacing: 0.06em; color: var(--ink-faint); }

@media (max-width: 400px) {
  nav.links a { padding: 0.45rem 0.45rem; font-size: 0.8rem; }
  .brand small { display: none; }
}