/* ============================================================
   voxNest / 声巢 — official site (redesign)
   Apple Design principles:
   - system typography with optical-size tracking & leading
   - layered translucent materials, context-aware depth
   - motion that responds on pointer-down and is interruptible
   - reduced-motion / reduced-transparency / contrast accessibility
   Positioning: built for macOS on Apple Silicon, accelerated by MLX.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Speech brand accent: indigo → violet, tuned for light/dark */
  --accent: #4559f0;
  --accent-strong: #3a4ad6;
  --accent-soft: rgba(69, 89, 240, 0.12);
  --accent-softer: rgba(69, 89, 240, 0.07);
  --grad: linear-gradient(120deg, #5f8bff 0%, #4559f0 46%, #9a5bff 100%);

  /* Apple neutrals */
  --bg: #fbfbfd;
  --bg-alt: #f4f4f6;
  --surface: #ffffff;
  --surface-2: #f5f5f7;
  --text: #16161a;
  --text-2: #6b6b72;
  --text-3: #9a9aa2;
  --hairline: rgba(22, 22, 26, 0.08);
  --hairline-strong: rgba(22, 22, 26, 0.16);
  --nav-bg: rgba(251, 251, 253, 0.72);

  --shadow-card: 0 2px 8px rgba(22, 22, 26, 0.04);
  --shadow-card-hover: 0 18px 44px -16px rgba(22, 22, 26, 0.18);
  --shadow-win:
    0 70px 140px -50px rgba(69, 89, 240, 0.35),
    0 40px 80px -36px rgba(22, 22, 26, 0.3);
  --shadow-chip: 0 10px 26px -12px rgba(69, 89, 240, 0.6);

  --ease: cubic-bezier(0.32, 0.72, 0, 1); /* critically damped feel */

  --font:
    -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #050507;
    --bg-alt: #0d0d11;
    --surface: #15151b;
    --surface-2: #1c1c23;
    --text: #f5f5f7;
    --text-2: #a1a1a9;
    --text-3: #6f6f77;
    --hairline: rgba(255, 255, 255, 0.1);
    --hairline-strong: rgba(255, 255, 255, 0.2);
    --nav-bg: rgba(9, 9, 12, 0.7);
    --accent-soft: rgba(112, 126, 255, 0.16);
    --accent-softer: rgba(112, 126, 255, 0.09);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.34);
    --shadow-card-hover: 0 18px 44px -16px rgba(0, 0, 0, 0.66);
    --shadow-win:
      0 70px 140px -50px rgba(80, 96, 255, 0.24),
      0 40px 80px -36px rgba(0, 0, 0, 0.72);
    --shadow-chip: 0 10px 26px -12px rgba(80, 96, 255, 0.5);
  }
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
  overflow-x: clip;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

::selection {
  background: var(--accent-soft);
  color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 300;
  padding: 10px 18px;
  border-radius: 980px;
  background: var(--surface);
  border: 1px solid var(--hairline-strong);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-card);
  transition: top 0.28s var(--ease);
}
.skip-link:focus {
  top: 16px;
}
.skip-link:hover {
  text-decoration: none;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 40px);
}

/* ---------- Typography: tracking & leading scale with size ---------- */
h1, h2, h3 {
  font-weight: 700;
  text-wrap: balance;
}

.display {
  font-size: clamp(2.6rem, 6.2vw, 4.8rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.h2 {
  font-size: clamp(1.85rem, 3.4vw, 2.85rem);
  line-height: 1.08;
  letter-spacing: -0.028em;
}

.h3 {
  font-size: 1.18rem;
  letter-spacing: -0.014em;
}

/* CJK: neutral tracking, a touch taller leading */
:lang(zh) h1,
:lang(zh) h2,
:lang(zh) h3 {
  letter-spacing: 0;
  line-height: 1.16;
  font-weight: 650;
}
:lang(zh) .display {
  line-height: 1.14;
}
:lang(zh) .h2 {
  line-height: 1.18;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.sub {
  font-size: clamp(1.05rem, 1.6vw, 1.24rem);
  line-height: 1.6;
  color: var(--text-2);
  letter-spacing: 0.002em;
  max-width: 640px;
}
:lang(zh) .sub {
  line-height: 1.72;
}

/* ---------- Buttons: feedback on pointer-down, damped ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 0;
  border-radius: 980px;
  padding: 15px 28px;
  font: 600 1.02rem/1 var(--font);
  letter-spacing: -0.006em;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    transform 0.32s var(--ease),
    background-color 0.2s ease,
    box-shadow 0.32s var(--ease);
}
.btn:hover {
  text-decoration: none;
}
.btn:active {
  transform: scale(0.965);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-chip);
}
.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-ghost {
  background: var(--accent-soft);
  color: var(--accent);
}
.btn-ghost:hover {
  background: var(--accent-softer);
}

.btn .icon {
  width: 18px;
  height: 18px;
  flex: none;
}
.btn-sm {
  padding: 11px 20px;
  font-size: 0.94rem;
}

/* ---------- Nav: translucent layered material ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  backdrop-filter: blur(22px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.nav.scrolled {
  border-bottom-color: var(--hairline);
}

.nav-inner {
  height: 56px;
  display: flex;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}
.brand:hover {
  text-decoration: none;
}
.brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  box-shadow: var(--shadow-card);
}
:lang(zh) .brand {
  font-weight: 650;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-inline: auto;
}
.nav-links a {
  color: var(--text-2);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 7px 13px;
  border-radius: 980px;
  transition:
    color 0.2s ease,
    background-color 0.2s ease;
}
.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
  background: var(--accent-softer);
}
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.nav-github {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--text-2);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-github:hover {
  color: var(--text);
  text-decoration: none;
}
.nav-github .icon {
  width: 19px;
  height: 19px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 13px;
  border-radius: 980px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 600;
  transition: transform 0.32s var(--ease), background-color 0.2s ease;
}
.lang-switch:hover {
  text-decoration: none;
  background: var(--accent-softer);
}
.lang-switch:active {
  transform: scale(0.95);
}

/* ---------- Hero ---------- */
.hero {
  padding: 158px 0 70px;
  text-align: center;
  position: relative;
  overflow: clip;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -260px -20% auto;
  height: 720px;
  background:
    radial-gradient(closest-side at 42% 40%, rgba(95, 139, 255, 0.22), transparent 70%),
    radial-gradient(closest-side at 60% 46%, rgba(154, 91, 255, 0.16), transparent 68%);
  filter: blur(6px);
  pointer-events: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  border-radius: 980px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  margin: 28px auto 20px;
  max-width: 880px;
}
.hero .sub {
  margin: 0 auto;
  max-width: 680px;
}

.hero-ctas {
  margin-top: 38px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-meta {
  margin-top: 24px;
  font-size: 0.87rem;
  color: var(--text-3);
  letter-spacing: 0.005em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-meta .mlx-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border-radius: 980px;
  border: 1px solid var(--hairline-strong);
  color: var(--text-2);
  font-weight: 600;
  background: var(--surface-2);
}
.hero-meta .mlx-chip b {
  color: var(--accent);
}

/* ---------- App window mock ---------- */
.hero-visual {
  position: relative;
  max-width: 940px;
  margin: 78px auto 0;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 6% -8% -14%;
  background:
    radial-gradient(closest-side at 45% 50%, rgba(95, 139, 255, 0.26), transparent 70%),
    radial-gradient(closest-side at 58% 52%, rgba(154, 91, 255, 0.2), transparent 66%);
  filter: blur(54px);
  pointer-events: none;
}

/* ---------- Trust strip ---------- */
.trust {
  padding: 34px 0 8px;
}
.trust ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 0;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-2);
}
.trust li {
  display: flex;
  align-items: center;
}
.trust li + li::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-3);
  margin: 0 22px;
  opacity: 0.6;
}

/* ---------- Sections ---------- */
.sec {
  padding: 116px 0;
}
.sec-alt {
  background: var(--bg-alt);
}
.sec-head {
  max-width: 720px;
  margin-bottom: 60px;
}
.sec-head.center {
  margin-inline: auto;
  text-align: center;
}
.sec-head .sub {
  margin-top: 18px;
}
.sec-head.center .sub {
  margin-inline: auto;
}

/* ---------- Feature cards ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 22px;
  padding: 30px 28px;
  box-shadow: var(--shadow-card);
  transition:
    transform 0.4s var(--ease),
    box-shadow 0.4s var(--ease),
    background-color 0.3s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  background: var(--surface);
}
.card .icon {
  width: 30px;
  height: 30px;
  color: var(--accent);
  margin-bottom: 18px;
}
.card h3 {
  font-size: 1.13rem;
  font-weight: 650;
  letter-spacing: -0.012em;
  margin-bottom: 9px;
}
.card p {
  font-size: 0.94rem;
  line-height: 1.62;
  color: var(--text-2);
}

/* ---------- Apple Silicon highlight band ---------- */
.silicon {
  position: relative;
  overflow: clip;
}
.silicon .container {
  position: relative;
}
.silicon-band {
  border-radius: 30px;
  padding: 62px clamp(28px, 5vw, 56px);
  background:
    radial-gradient(closest-side at 12% 0%, rgba(95, 139, 255, 0.28), transparent 70%),
    radial-gradient(closest-side at 88% 100%, rgba(154, 91, 255, 0.26), transparent 66%),
    linear-gradient(150deg, #1c1c26 0%, #0e0e16 100%);
  color: #f5f5f7;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 40px 90px -40px rgba(22, 22, 26, 0.5);
}
.silicon-band .badge {
  background: rgba(112, 126, 255, 0.22);
  color: #c6d0ff;
}
.silicon-band h2 {
  color: #f5f5f7;
  letter-spacing: -0.028em;
  margin: 18px 0 16px;
  max-width: 640px;
}
:lang(zh) .silicon-band h2 {
  letter-spacing: 0;
  line-height: 1.16;
}
.silicon-band .sub {
  color: #b8b8c2;
  max-width: 620px;
}
.silicon-list {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.silicon-item {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  padding: 22px 22px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.silicon-item .icon {
  width: 26px;
  height: 26px;
  color: #9faeff;
  margin-bottom: 12px;
}
.silicon-item h3 {
  color: #f5f5f7;
  font-size: 1.06rem;
  font-weight: 650;
  margin-bottom: 7px;
  letter-spacing: -0.012em;
}
:lang(zh) .silicon-item h3 {
  letter-spacing: 0;
}
.silicon-item p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #b8b8c2;
}

/* ---------- Models ---------- */
.models-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}
.model-col {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 24px;
  padding: 30px 28px;
  box-shadow: var(--shadow-card);
}
.model-col > h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 650;
  letter-spacing: -0.012em;
  margin-bottom: 6px;
}
.model-col > h3 .icon {
  width: 22px;
  height: 22px;
  color: var(--accent);
}
.model-col > .col-note {
  font-size: 0.84rem;
  color: var(--text-2);
  margin-bottom: 20px;
}
.model-item {
  padding: 18px 0;
  border-top: 1px solid var(--hairline);
}
.model-item h4 {
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}
.model-item h4 span {
  margin-left: 8px;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 980px;
  padding: 3px 10px;
  vertical-align: 2px;
  white-space: nowrap;
}
.model-item p {
  margin-top: 7px;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-2);
}
.spec-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}
.spec-chips span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-2);
  border: 1px solid var(--hairline-strong);
  border-radius: 980px;
  padding: 3px 11px;
  background: var(--bg);
}

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 30px 28px;
  border-radius: 22px;
  border: 1px solid var(--hairline);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}
.step .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--grad);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 18px;
  box-shadow: var(--shadow-chip);
}
.step h3 {
  font-size: 1.13rem;
  font-weight: 650;
  margin-bottom: 8px;
}
.step p {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--text-2);
}

/* ---------- Download ---------- */
.dl-wrap {
  max-width: 640px;
  margin-inline: auto;
}
.dl-card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 28px;
  padding: 50px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-card-hover);
}
.dl-card .plat {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}
.dl-card .plat .chip {
  font-size: 0.76rem;
}
.dl-card .chips {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
  justify-content: center;
}
.dl-card .note {
  margin-top: 14px;
  font-size: 0.88rem;
  color: var(--text-2);
  max-width: 420px;
}
.dl-actions {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 320px;
}
.dl-actions .btn {
  width: 100%;
}
.dl-foot {
  margin-top: 34px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-2);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}
.dl-foot .sep {
  opacity: 0.55;
}

/* ---------- FAQ ---------- */
.faq {
  max-width: 760px;
  margin-inline: auto;
}
.faq details {
  border-top: 1px solid var(--hairline);
}
.faq details:last-child {
  border-bottom: 1px solid var(--hairline);
}
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 4px;
  font-size: 1.06rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary:hover {
  color: var(--accent);
}
.faq .chev {
  flex: none;
  width: 18px;
  height: 18px;
  color: var(--text-3);
  transition: transform 0.32s var(--ease);
}
.faq details[open] .chev {
  transform: rotate(180deg);
}
.faq details p {
  padding: 0 4px 22px;
  max-width: 640px;
  color: var(--text-2);
  font-size: 0.97rem;
  line-height: 1.65;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 42px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
}
.footer .brand {
  font-size: 1.05rem;
}
.footer-tag {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-2);
  max-width: 280px;
  line-height: 1.6;
}
.footer h5 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 14px;
}
:lang(zh) .footer h5 {
  text-transform: none;
  letter-spacing: 0.05em;
}
.footer-col a {
  display: block;
  color: var(--text-2);
  font-size: 0.92rem;
  padding: 5px 0;
}
.footer-col a:hover {
  color: var(--text);
  text-decoration: none;
}
.footer-bottom {
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-3);
}
.footer-bottom .lang-switch {
  font-size: 0.8rem;
}

/* ---------- Reveal on scroll (interruptible, opacity-led) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s ease,
    transform 0.6s var(--ease);
  transition-delay: var(--d, 0s);
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- Icons ---------- */
.icon {
  display: block;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  .silicon-list {
    grid-template-columns: 1fr 1fr;
  }
  .models-grid {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .app-window {
    grid-template-columns: 200px 1fr;
  }
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
  }
  .nav-github span {
    display: none;
  }
  .hero {
    padding-top: 130px;
  }
  .sec {
    padding: 88px 0;
  }
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .silicon-list {
    grid-template-columns: 1fr;
  }
  .silicon-band {
    padding: 44px 24px;
    border-radius: 24px;
  }
  .dl-card {
    padding: 40px 24px;
  }
  .app-window {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .win-side {
    display: none;
  }
  .trust li + li::before {
    margin: 0 14px;
  }
}

/* ---------- Reduced motion: cross-fades only ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    transform: none;
    transition: opacity 0.4s ease;
  }
  .card:hover,
  .btn:active,
  .lang-switch:active {
    transform: none;
  }
  .wave i.breathe {
    animation: none;
  }
}

/* ---------- Reduced transparency: frost the material ---------- */
@media (prefers-reduced-transparency: reduce) {
  .nav {
    background: var(--bg);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .silicon-item {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(255, 255, 255, 0.08);
  }
}

/* ---------- Increased contrast: defined edges ---------- */
@media (prefers-contrast: more) {
  .card,
  .step,
  .model-col,
  .dl-card,
  .app-window,
  .silicon-item {
    border-color: var(--hairline-strong);
  }
  .nav.scrolled {
    border-bottom-color: var(--hairline-strong);
  }
}

/* ============================================================
   新版特有组件（legacy CSS 基线 + 增量）
   ============================================================ */

/* ---------- Gradient text aliasing ---------- */
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- Eyebrow small label ---------- */
.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 14px;
}
:lang(zh) .eyebrow {
  text-transform: none;
  letter-spacing: 0.06em;
}

/* ---------- Lead paragraph ---------- */
.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.24rem);
  line-height: 1.65;
  color: var(--text-2);
  letter-spacing: 0.002em;
  max-width: 640px;
  margin: 0 auto;
}
:lang(zh) .lead {
  line-height: 1.75;
}

/* ---------- btn-lg large button ---------- */
.btn-lg {
  padding: 16px 32px;
  font-size: 1.06rem;
}

/* ---------- Product Story section ---------- */
.story-section {
  padding: 116px 0;
}
.story-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 80px;
}
.story-block:last-child { margin-bottom: 0; }
.story-block.reverse .story-text { order: 2; }
.story-block.reverse .story-visual { order: 1; }

.story-text h3 {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.12;
  margin-bottom: 16px;
}
.story-text p {
  color: var(--text-2);
  font-size: 1.02rem;
  line-height: 1.72;
}

.story-visual {
  aspect-ratio: 4 / 3;
  border-radius: 24px;
  overflow: hidden;
}

/* ---------- Visual cards inside story blocks ---------- */
.visual-card {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 32px;
  border-radius: 24px;
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-win);
  position: relative;
  overflow: hidden;
}
.visual-privacy {
  background:
    radial-gradient(closest-side at 20% 10%, rgba(69, 89, 240, 0.28), transparent 65%),
    radial-gradient(closest-side at 85% 85%, rgba(154, 91, 255, 0.22), transparent 60%),
    var(--surface);
}
.visual-silicon {
  background: linear-gradient(145deg, #1a1a24 0%, #0d0d14 100%);
  color: #f5f5f7;
  border-color: rgba(255, 255, 255, 0.08);
}
.visual-models {
  background: var(--surface);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 24px;
}

/* Shield icon box */
.shield {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
}
.shield svg { width: 30px; height: 30px; }

/* Chip icon */
.chip-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #5f8bff, #9a5bff);
  color: #fff;
  display: grid;
  place-items: center;
}
.chip-icon svg { width: 26px; height: 26px; }

/* Visual row (privacy card rows) */
.visual-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-2);
}
.visual-silicon .visual-row { color: #b8b8c2; }

/* Colored dots */
.dot.green { background: #30d158; }
.dot.red { background: #ff453a; }

/* Visual metric */
.visual-metric {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.visual-metric .num {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  background: linear-gradient(120deg, #5f8bff, #9a5bff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.visual-metric .label {
  font-size: 0.82rem;
  color: #b8b8c2;
  font-weight: 500;
}

/* Model tile */
.model-tile {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.model-tile .tag {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}
.model-tile strong {
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--text);
  letter-spacing: -0.01em;
}
.model-tile small {
  font-size: 0.78rem;
  color: var(--text-3);
}

/* ---------- Responsive: Product Story ---------- */
@media (max-width: 960px) {
  .story-block {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .story-block.reverse .story-text,
  .story-block.reverse .story-visual {
    order: initial;
  }
  .story-visual {
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 720px) {
  .story-section {
    padding: 88px 0;
  }
  .story-block {
    gap: 28px;
    margin-bottom: 56px;
  }
  .story-text h3 {
    font-size: 1.3rem;
  }
}

/* ---------- Legacy CSS missing child selectors (fill gaps) ---------- */
.brand-name {
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
:lang(zh) .brand-name {
  font-weight: 650;
  letter-spacing: 0;
}

.dl-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 480px;
  margin: 28px auto 0;
  gap: 0;
}
@media (max-width: 720px) {
  .dl-grid {
    max-width: 100%;
  }
}

/* ==========================================================
   1:1 APP PREVIEW (mock-* prefix, isolated from legacy styles)
   Aligned to voxNest desktop app — brand #3662ec
   ========================================================== */

.mock-window {
  position: relative;
  display: grid;
  grid-template-columns: 212px 1fr;
  grid-template-rows: 46px 1fr 66px;
  min-height: 520px;
  border-radius: 20px;
  overflow: hidden;
  background: #f5f5f7;
  color: #1d1d1f;
  box-shadow:
    0 1px 0 rgba(255,255,255,.8) inset,
    0 20px 60px rgba(0,0,0,.12),
    0 4px 20px rgba(0,0,0,.06);
  text-align: left;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", sans-serif;
  font-size: 13px;
}

/* Title bar */
.mock-titlebar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  height: 46px;
  padding: 0 16px;
  background: #ffffff;
  border-bottom: 1px solid rgba(0,0,0,.06);
}
.mock-traffic { display: flex; gap: 8px; }
.mock-traffic i {
  width: 12px; height: 12px; border-radius: 50%;
}
.mock-traffic i:nth-child(1) { background: #ff5f57; }
.mock-traffic i:nth-child(2) { background: #febc2e; }
.mock-traffic i:nth-child(3) { background: #28c840; }
.mock-win-title {
  margin-inline: auto;
  font-size: 12px;
  font-weight: 600;
  color: #86868b;
}

/* Sidebar (212px, matches real app --side-w) */
.mock-side {
  grid-row: 2 / 3;
  background: #ffffff;
  border-right: 1px solid rgba(0,0,0,.06);
  display: flex;
  flex-direction: column;
  padding: 16px 10px;
  gap: 18px;
  overflow: hidden;
}

.mock-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 0;
}
.mock-logo-box {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: #3662ec;
  display: grid; place-items: center;
  box-shadow: 0 2px 8px rgba(54,98,236,.35);
}
.mock-logo-box svg { width: 20px; height: 20px; }
.mock-logo-box svg path {
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  fill: none;
}
.mock-logo-box svg .ml-fill { fill: #fff; stroke: none; }
.mock-logo-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #1d1d1f;
}

/* Nav */
.mock-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.mock-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 500;
  color: #515154;
  cursor: pointer;
  transition: background-color .15s ease;
}
.mock-nav-item:hover { background: rgba(0,0,0,.04); }
.mock-nav-item svg { width: 18px; height: 18px; flex: none; opacity: .75; }
.mock-nav-item svg path {
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}
.mock-nav-item.active {
  background: rgba(54,98,236,.1);
  color: #3662ec;
  font-weight: 600;
}
.mock-nav-item.active svg { opacity: 1; }

/* Side footer (status) */
.mock-side-foot {
  margin-top: auto;
  padding: 0 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mock-sf-sep { height: 1px; background: rgba(0,0,0,.06); }
.mock-sf-status {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11.5px;
  color: #86868b;
}
.mock-sf-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #34c759;
  box-shadow: 0 0 0 3px rgba(52,199,89,.15);
}
.mock-sf-ver {
  font-size: 10.5px;
  color: #86868b;
  letter-spacing: .02em;
}

/* Main area */
.mock-main {
  grid-row: 2 / 3;
  padding: 18px 22px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  overflow: hidden;
}

.mock-p-head { }
.mock-p-head h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: #1d1d1f;
  margin: 0 0 2px;
}
.mock-p-head p {
  font-size: 12.5px;
  color: #86868b;
  margin: 0;
}

/* Toolbar */
.mock-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: #ffffff;
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 12px;
}
.mock-tb-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #86868b;
  padding: 0 4px;
}
.mock-tb-model {
  font-size: 12px;
  font-weight: 600;
  color: #515154;
  padding: 4px 10px;
  background: rgba(0,0,0,.04);
  border-radius: 8px;
  margin-right: 4px;
}
.mock-toolbar-right { margin-left: auto; }

/* Segmented control (macOS native style) */
.mock-seg {
  display: inline-flex;
  background: #f2f2f4;
  border-radius: 9px;
  padding: 2px;
  gap: 1px;
}
.mock-seg-item {
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  color: #515154;
  border-radius: 7px;
  cursor: pointer;
  transition: all .15s ease;
}
.mock-seg-item.active {
  background: #ffffff;
  color: #1d1d1f;
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,.08), 0 0 0 1px rgba(0,0,0,.05);
}
.mock-seg.brand-seg .mock-seg-item.active {
  background: #3662ec;
  color: #fff;
  box-shadow: none;
}

/* Result card */
.mock-result {
  flex: 1;
  background: #ffffff;
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
.mock-res-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(0,0,0,.05);
}
.mock-res-head h3 {
  font-size: 13px;
  font-weight: 650;
  color: #1d1d1f;
  margin: 0;
}
.mock-res-badge {
  font-size: 10.5px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 980px;
  background: rgba(54,98,236,.1);
  color: #3662ec;
}
.mock-res-count {
  margin-left: auto;
  font-size: 11.5px;
  color: #86868b;
}

/* Audio player row */
.mock-res-player {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: #fafafa;
  border-bottom: 1px solid rgba(0,0,0,.04);
}
.mock-play-btn {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: #3662ec;
  display: grid; place-items: center;
  flex: none;
  box-shadow: 0 1px 4px rgba(54,98,236,.3);
}
.mock-play-btn svg { width: 12px; height: 12px; }
.mock-play-btn svg path { fill: #fff; margin-left: 1px; }
.mock-time-label {
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 11.5px;
  color: #515154;
  font-variant-numeric: tabular-nums;
}
.mock-progress {
  flex: 1;
  height: 3px;
  background: rgba(0,0,0,.08);
  border-radius: 2px;
  overflow: hidden;
}
.mock-progress-fill {
  width: 34%;
  height: 100%;
  background: #3662ec;
  border-radius: 2px;
}
.mock-fname {
  font-size: 11.5px;
  color: #86868b;
  max-width: 160px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Result body tabs */
.mock-res-tabs {
  display: flex;
  gap: 0;
  padding: 0 12px;
  border-bottom: 1px solid rgba(0,0,0,.05);
}
.mock-res-tab {
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 500;
  color: #86868b;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color .15s ease;
}
.mock-res-tab.active {
  color: #3662ec;
  font-weight: 600;
  border-bottom-color: #3662ec;
}

.mock-res-body {
  flex: 1;
  padding: 14px 18px 10px;
  overflow-y: auto;
  font-size: 13.5px;
  line-height: 1.7;
  color: #1d1d1f;
  min-height: 0;
}

/* Doc (plain text) */
.mock-res-doc p {
  margin: 0 0 10px;
}
.mock-res-doc p mark {
  background: rgba(54,98,236,.12);
  color: #2451db;
  border-radius: 4px;
  padding: 1px 4px;
  font-weight: 600;
}

/* Timeline */
.mock-res-tl { }
.mock-res-tl-row {
  display: flex;
  gap: 14px;
  padding: 6px 0;
  font-size: 13px;
  border-bottom: 1px dashed rgba(0,0,0,.04);
}
.mock-res-tl-row:last-child { border-bottom: none; }
.mock-res-tl-row.active { background: rgba(54,98,236,.06); border-radius: 6px; padding: 6px 8px; margin: 0 -8px; }
.mock-res-tl-time {
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 11px;
  color: #86868b;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-top: 2px;
}
.mock-res-tl-row.active .mock-res-tl-time { color: #3662ec; }
.mock-res-tl-text { color: #1d1d1f; flex: 1; }

/* SRT */
.mock-res-srt { }
.mock-res-srt-block {
  margin-bottom: 12px;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 12px;
}
.mock-res-srt-time {
  color: #86868b;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}
.mock-res-srt-text {
  font-family: -apple-system, sans-serif;
  margin-top: 4px;
  color: #1d1d1f;
  font-size: 13px;
  font-family: inherit;
}

/* Dock (66px, matches real app --dock-h) */
.mock-dock {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  height: 66px;
  background: #ffffff;
  border-top: 1px solid rgba(0,0,0,.06);
}
.mock-dock-left,
.mock-dock-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
.mock-dock-right { justify-content: flex-end; }
.mock-dock-center {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  color: #86868b;
}
.mock-dock-fname {
  font-size: 12px;
  color: #515154;
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mock-dock-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  color: #515154;
  background: rgba(0,0,0,.04);
  border: none;
  cursor: pointer;
  transition: all .15s;
}
.mock-dock-btn:hover { background: rgba(0,0,0,.08); }
.mock-dock-btn.primary {
  background: #3662ec;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(54,98,236,.25);
}
.mock-dock-btn.primary:hover { background: #2451db; }
.mock-dock-btn.danger {
  background: rgba(255,59,48,.1);
  color: #ff3b30;
}
.mock-dock-btn.sm { padding: 5px 10px; font-size: 11.5px; }
.mock-dock-btn svg { width: 14px; height: 14px; }
.mock-dock-btn svg path {
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* Waveform (inside dock center) */
.mock-dock-wave {
  display: flex;
  align-items: center;
  gap: 2px;
  height: 24px;
}
.mock-mini-wave {
  display: flex;
  align-items: center;
  gap: 2px;
  height: 18px;
  padding: 0 4px;
}
.mock-wave-bar {
  width: 2px;
  border-radius: 1px;
  background: #3662ec;
  opacity: .7;
  transform-origin: center;
}
.mock-wave-bar.breathe {
  animation: mockWaveBreathe 2.8s ease-in-out infinite;
}
@keyframes mockWaveBreathe {
  0% { transform: scaleY(0.55); }
  50% { transform: scaleY(1); }
  100% { transform: scaleY(0.55); }
}

/* Dark mode for mock window */
@media (prefers-color-scheme: dark) {
  .mock-window {
    background: #161617;
    color: #f5f5f7;
    box-shadow:
      0 1px 0 rgba(255,255,255,.04) inset,
      0 20px 60px rgba(0,0,0,.5),
      0 4px 20px rgba(0,0,0,.3);
  }
  .mock-titlebar,
  .mock-side,
  .mock-dock {
    background: #1c1c1e;
    border-color: rgba(255,255,255,.08);
  }
  .mock-side { border-right-color: rgba(255,255,255,.08); }
  .mock-dock { border-top-color: rgba(255,255,255,.08); }
  .mock-logo-name,
  .mock-p-head h1 { color: #f5f5f7; }
  .mock-logo-box { background: #4c7bff; box-shadow: 0 2px 8px rgba(76,123,255,.4); }
  .mock-nav-item { color: #c7c7cc; }
  .mock-nav-item:hover { background: rgba(255,255,255,.06); }
  .mock-nav-item.active { background: rgba(76,123,255,.18); color: #4c7bff; }
  .mock-toolbar,
  .mock-result {
    background: #1c1c1e;
    border-color: rgba(255,255,255,.08);
  }
  .mock-res-head { border-bottom-color: rgba(255,255,255,.06); }
  .mock-res-head h3 { color: #f5f5f7; }
  .mock-res-badge { background: rgba(76,123,255,.18); color: #4c7bff; }
  .mock-res-player { background: #202022; border-bottom-color: rgba(255,255,255,.06); }
  .mock-progress { background: rgba(255,255,255,.1); }
  .mock-progress-fill,
  .mock-wave-bar { background: #4c7bff; }
  .mock-play-btn { background: #4c7bff; box-shadow: 0 1px 4px rgba(76,123,255,.35); }
  .mock-seg { background: #232326; }
  .mock-seg-item { color: #c7c7cc; }
  .mock-seg-item.active {
    background: #303032;
    color: #f5f5f7;
    box-shadow: 0 1px 2px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.06);
  }
  .mock-seg.brand-seg .mock-seg-item.active { background: #4c7bff; color: #fff; box-shadow: none; }
  .mock-tb-model { background: rgba(255,255,255,.06); color: #c7c7cc; }
  .mock-res-tabs { border-bottom-color: rgba(255,255,255,.06); }
  .mock-res-tab.active { color: #4c7bff; border-bottom-color: #4c7bff; }
  .mock-res-body { color: #f5f5f7; }
  .mock-res-doc p mark { background: rgba(76,123,255,.2); color: #8fb1ff; }
  .mock-res-tl-row { border-bottom-color: rgba(255,255,255,.04); }
  .mock-res-tl-row.active { background: rgba(76,123,255,.12); }
  .mock-res-tl-row.active .mock-res-tl-time { color: #4c7bff; }
  .mock-sf-sep { background: rgba(255,255,255,.08); }
  .mock-dock-btn { background: rgba(255,255,255,.08); color: #c7c7cc; }
  .mock-dock-btn:hover { background: rgba(255,255,255,.14); }
  .mock-dock-btn.primary { background: #4c7bff; }
  .mock-dock-btn.primary:hover { background: #3a6bef; }
  .mock-dock-btn.danger { background: rgba(255,59,48,.16); color: #ff6960; }
  .mock-res-srt-block { border-bottom-color: rgba(255,255,255,.06); }
  .mock-res-srt-text { color: #f5f5f7; }
}

/* Responsive */
@media (max-width: 960px) {
  .mock-window {
    grid-template-columns: 64px 1fr;
    min-height: 460px;
  }
  .mock-logo-name,
  .mock-nav-item span:not(.mock-nav-icon-only),
  .mock-side-foot,
  .mock-sf-status,
  .mock-sf-ver,
  .mock-side-foot-sep {
    display: none;
  }
  .mock-logo { justify-content: center; padding: 4px 0; }
  .mock-nav { align-items: center; }
  .mock-nav-item { padding: 8px; justify-content: center; }
  .mock-nav-item svg { margin: 0; }
}

@media (max-width: 720px) {
  .mock-window {
    grid-template-columns: 1fr;
    grid-template-rows: 40px auto 1fr auto;
    min-height: 380px;
  }
  .mock-side {
    grid-row: auto;
    flex-direction: row;
    padding: 8px 12px;
    gap: 10px;
    border-right: none;
    border-bottom: 1px solid rgba(0,0,0,.06);
    overflow-x: auto;
  }
  .mock-logo { padding: 0; }
  .mock-logo-name { display: block; }
  .mock-nav {
    flex-direction: row;
    gap: 4px;
    overflow-x: auto;
  }
  .mock-nav-item { padding: 6px 10px; }
  .mock-side-foot { display: none; }
  .mock-main { padding: 12px; }
  .mock-toolbar { flex-wrap: wrap; gap: 6px; }
  .mock-res-head { flex-wrap: wrap; }
  .mock-dock {
    flex-wrap: wrap;
    height: auto;
    padding: 10px 14px;
    gap: 8px;
  }
  .mock-dock-left,
  .mock-dock-right,
  .mock-dock-center {
    flex: 1 1 auto;
    justify-content: center;
  }
}