/* AstraTrans · 官网样式
 *
 * 视觉沿用桌面版的材质：蓝→紫的小球、玻璃卡片、轮廓上的高光、面上的光泽。
 * 浅色深色跟随系统。不加载任何外部资源。
 */

:root {
  color-scheme: light;
  --font: "Segoe UI Variable Display", "Segoe UI Variable Text", "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei",
          "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
  --mono: "Cascadia Code", "Cascadia Mono", Consolas, "SF Mono", Menlo, "DejaVu Sans Mono", monospace;

  --bg: #f3f5f9;
  --ink: #1b1e24;
  --ink-2: #4f5866;
  --ink-3: #8a93a2;
  --accent: #1f7fe0;
  --accent-2: #7c5cff;
  --warn: #b4761c;

  --tint: rgba(255, 255, 255, .52);
  --tint-2: rgba(255, 255, 255, .70);
  --tint-3: rgba(255, 255, 255, .88);
  --rim: rgba(255, 255, 255, .90);
  --rim-2: rgba(255, 255, 255, .60);
  --shade: rgba(20, 30, 50, .08);
  --line: rgba(20, 30, 50, .10);
  --sheen: linear-gradient(115deg, rgba(255, 255, 255, .34), rgba(255, 255, 255, 0) 34%, rgba(255, 255, 255, 0) 66%, rgba(255, 255, 255, .16));
  --shadow: 0 10px 30px rgba(20, 30, 50, .08), 0 1px 2px rgba(20, 30, 50, .05);
  --nav-bg: rgba(243, 245, 249, .72);

  --wall: radial-gradient(60% 80% at 18% 18%, #b3cdff 0%, rgba(179, 205, 255, 0) 70%),
          radial-gradient(50% 70% at 82% 26%, #e6bfff 0%, rgba(230, 191, 255, 0) 70%),
          radial-gradient(60% 60% at 60% 95%, #a9ecff 0%, rgba(169, 236, 255, 0) 70%),
          linear-gradient(135deg, #dfe9ff, #f2e6ff);
  --aurora-a: rgba(31, 127, 224, .16);
  --aurora-b: rgba(124, 92, 255, .14);
  --aurora-c: rgba(64, 200, 224, .12);

  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0f1218;
    --ink: #e9edf3;
    --ink-2: #aeb7c4;
    --ink-3: #727c8b;
    --accent: #5cb1ff;
    --accent-2: #a58bff;
    --warn: #e0a34a;
    --tint: rgba(30, 34, 43, .52);
    --tint-2: rgba(30, 34, 43, .66);
    --tint-3: rgba(38, 43, 53, .82);
    --rim: rgba(255, 255, 255, .16);
    --rim-2: rgba(255, 255, 255, .10);
    --shade: rgba(0, 0, 0, .35);
    --line: rgba(255, 255, 255, .09);
    --sheen: linear-gradient(115deg, rgba(255, 255, 255, .10), rgba(255, 255, 255, 0) 34%, rgba(255, 255, 255, 0) 66%, rgba(255, 255, 255, .05));
    --shadow: 0 10px 30px rgba(0, 0, 0, .35), 0 1px 2px rgba(0, 0, 0, .3);
    --nav-bg: rgba(15, 18, 24, .72);
    --wall: radial-gradient(60% 80% at 18% 18%, #23459a 0%, rgba(35, 69, 154, 0) 70%),
            radial-gradient(50% 70% at 82% 26%, #5a2f9e 0%, rgba(90, 47, 158, 0) 70%),
            radial-gradient(60% 60% at 60% 95%, #0f5a78 0%, rgba(15, 90, 120, 0) 70%),
            linear-gradient(135deg, #0b1020, #1a1230);
    --aurora-a: rgba(31, 127, 224, .18);
    --aurora-b: rgba(124, 92, 255, .16);
    --aurora-c: rgba(64, 200, 224, .10);
  }
}

/* ---- 基础 ------------------------------------------------------------ */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.65 var(--font);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}
/* 柔和的光晕固定在页面后面，玻璃卡片透过它显得有深度。 */
body::before {
  content: "";
  position: fixed; inset: -20% -10%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(38% 34% at 12% 8%, var(--aurora-a), transparent 70%),
    radial-gradient(34% 30% at 88% 14%, var(--aurora-b), transparent 70%),
    radial-gradient(40% 32% at 70% 88%, var(--aurora-c), transparent 70%),
    radial-gradient(30% 28% at 20% 78%, var(--aurora-b), transparent 70%);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; padding: 0; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
::selection { background: rgba(31, 127, 224, .22); }
[hidden] { display: none !important; }
kbd { font: 12px var(--mono); }

.wrap { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }
@media (max-width: 480px) { .wrap { width: calc(100% - 32px); } }

.i {
  width: 1.25em; height: 1.25em; flex: none;
  stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; fill: none;
  vertical-align: -.28em;
}

/* 玻璃：底色 + 光泽 + 左上亮右下暗的 1px 内描边。 */
.glass {
  background: var(--sheen), var(--tint);
  border: 1px solid var(--rim-2);
  border-radius: var(--radius);
  box-shadow: inset 1px 1px 0 var(--rim), inset -1px -1px 0 var(--shade), var(--shadow);
}
.frost { backdrop-filter: blur(18px) saturate(1.35); -webkit-backdrop-filter: blur(18px) saturate(1.35); }

/* 小球：产品的标记。 */
.orb {
  width: 28px; height: 28px; border-radius: 50%; flex: none; display: inline-block;
  background:
    radial-gradient(circle at 32% 28%, rgba(255, 255, 255, .95), rgba(255, 255, 255, 0) 45%),
    linear-gradient(140deg, var(--accent), var(--accent-2));
  box-shadow: inset 0 -2px 4px rgba(0, 0, 0, .18), 0 2px 8px rgba(31, 127, 224, .28);
}

/* ---- 导航 ------------------------------------------------------------ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 16px; height: 60px; position: relative; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); letter-spacing: .2px; font-size: 17px; }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 2px; margin-left: auto; }
.nav-links a { padding: 8px 12px; border-radius: 8px; color: var(--ink-2); font-size: 14px; font-weight: 500; }
.nav-links a:hover { background: var(--tint-2); color: var(--ink); text-decoration: none; }
.nav-right { display: flex; align-items: center; gap: 8px; }
.only-mobile { display: none; }
.nav-toggle { display: none; }

/* ---- 按钮 ------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px;
  font-weight: 600; font-size: 15px; line-height: 1.3;
  color: var(--ink);
  background: var(--tint-2);
  border: 1px solid var(--rim-2);
  box-shadow: inset 1px 1px 0 var(--rim), inset -1px -1px 0 var(--shade);
  transition: transform .15s ease, background .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; background: var(--tint-3); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 8px 20px rgba(31, 127, 224, .28), inset 0 1px 0 rgba(255, 255, 255, .35);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.btn-sm { padding: 7px 12px; font-size: 14px; border-radius: 8px; }
.ib {
  width: 36px; height: 36px; border-radius: 8px; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink-2);
}
.ib:hover { background: var(--tint-2); color: var(--ink); }

/* ---- 版式 ------------------------------------------------------------ */
.section { padding-block: clamp(48px, 7vw, 88px); }
.section + .section { padding-top: 0; }
.section-head { max-width: 720px; margin-bottom: clamp(24px, 4vw, 40px); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before { content: ""; width: 18px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
h1 { font-size: clamp(38px, 7vw, 72px); line-height: 1.12; letter-spacing: -.01em; margin: .3em 0 .35em; font-weight: 800; }
h2 { font-size: clamp(26px, 3.6vw, 40px); line-height: 1.2; letter-spacing: -.01em; margin: .35em 0 .4em; font-weight: 750; }
h3 { font-size: 18px; margin: 0 0 8px; font-weight: 700; line-height: 1.35; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.lede { font-size: clamp(16px, 1.6vw, 19px); color: var(--ink-2); max-width: 60ch; margin: 0; }
.muted { color: var(--ink-3); }
.grad { background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px; border-radius: 999px;
  font-size: 12.5px; font-weight: 600; line-height: 1.4;
  background: var(--tint-3); border: 1px solid var(--line); color: var(--ink-2);
}
.badge.dev { color: var(--warn); }
.badge i { width: 7px; height: 7px; border-radius: 50%; background: currentColor; display: inline-block; }

/* ---- 首屏 ------------------------------------------------------------ */
.hero { padding-top: 16px; text-align: center; }
.hero h1 { margin-top: 0; }
.hero .lede { margin-inline: auto; max-width: 40em; }   /* 一句导语在桌面上放得下一行 */
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }
.hero-note { margin: 16px 0 0; font-size: 13.5px; color: var(--ink-3); }

.stage { margin: clamp(32px, 5vw, 52px) auto 0; max-width: 920px; }
.player {
  position: relative; aspect-ratio: 16 / 9; max-width: 100%;
  border-radius: 16px; overflow: hidden;
  background: #0e1320;
  box-shadow: var(--shadow), 0 24px 60px rgba(20, 30, 50, .22);
  border: 1px solid rgba(255, 255, 255, .08);
  color: #fff;
}
/* 发布会现场：一张内联 SVG，幻灯片、追光、观众、光点都在里面，只用 CSS 动。 */
.player .scene {
  position: absolute; inset: 0; width: 100%; height: 100%; display: block;
  transform-origin: 50% 60%;
  animation: kenburns 26s ease-in-out infinite alternate;
}
.scene text { font-family: var(--font); fill: #e9edf3; }
.scene .st-big { font-size: 34px; font-weight: 700; }
.scene .st-title { font-size: 40px; font-weight: 700; }
.scene .st-sub { font-size: 22px; fill: rgba(233, 237, 243, .7); }
.scene .st-li { font-size: 26px; }
.scene .st-badge { font-size: 26px; font-weight: 700; fill: #a58bff; }
.scene .st-tick { font-size: 18px; fill: rgba(233, 237, 243, .55); }
.scene .st-qa { font-size: 110px; font-weight: 800; fill: url(#g-bar); }
/* 幻灯片切换 */
.scene .slide { opacity: 0; transform-box: fill-box; transform-origin: center; transform: translateY(6px); transition: opacity .6s ease, transform .6s ease; }
.scene .slide.on { opacity: 1; transform: none; }
.scene .bar { transform-box: fill-box; transform-origin: 50% 100%; transform: scaleY(.08); transition: transform .9s cubic-bezier(.2, .7, .2, 1); }
.scene .slide.on .bar { transform: scaleY(1); }
.scene .slide.on .bar:nth-of-type(2) { transition-delay: .12s; }
.scene .slide.on .bar:nth-of-type(3) { transition-delay: .24s; }
.scene .slide.on .bar:nth-of-type(4) { transition-delay: .36s; }
.scene .st-badge { opacity: 0; transition: opacity .4s ease; }
.scene .slide.on .st-badge { opacity: 1; transition-delay: 1s; }
.scene .bullet { opacity: 0; transform-box: fill-box; transform: translateX(-10px); transition: opacity .5s ease, transform .5s ease; }
.scene .slide.on .bullet { opacity: 1; transform: none; }
.scene .slide.on .bullet:nth-of-type(1) { transition-delay: .25s; }
.scene .slide.on .bullet:nth-of-type(2) { transition-delay: .65s; }
.scene .slide.on .bullet:nth-of-type(3) { transition-delay: 1.05s; }
/* 追光 */
.scene .beam { transform-box: fill-box; transform-origin: 50% 0%; mix-blend-mode: screen; }
.scene .beam-a { animation: sway 9s ease-in-out infinite alternate; }
.scene .beam-b { animation: sway 11s ease-in-out infinite alternate-reverse; }
/* 空气里的光点 */
.scene .mote { opacity: 0; transform-box: fill-box; animation: float 12s linear infinite; }
.scene .mote:nth-child(2) { animation-duration: 15s; animation-delay: -4s; }
.scene .mote:nth-child(3) { animation-duration: 11s; animation-delay: -7s; }
.scene .mote:nth-child(4) { animation-duration: 17s; animation-delay: -2s; }
.scene .mote:nth-child(5) { animation-duration: 13s; animation-delay: -9s; }
.scene .mote:nth-child(6) { animation-duration: 16s; animation-delay: -5s; }
.scene .mote:nth-child(7) { animation-duration: 12s; animation-delay: -11s; }
.scene .mote:nth-child(8) { animation-duration: 14s; animation-delay: -1s; }
.scene .mote:nth-child(9) { animation-duration: 18s; animation-delay: -8s; }
.scene .mote:nth-child(10) { animation-duration: 13s; animation-delay: -6s; }
@keyframes kenburns { from { transform: scale(1); } to { transform: scale(1.06) translateX(-1%); } }
@keyframes sway { from { transform: rotate(-5deg); } to { transform: rotate(5deg); } }
@keyframes float {
  0% { transform: translateY(0); opacity: 0; }
  15% { opacity: .55; }
  85% { opacity: .3; }
  100% { transform: translateY(-260px); opacity: 0; }
}
.player .titlebar {
  position: absolute; top: 0; left: 0; right: 0; height: 30px;
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px; font-size: 12px; color: rgba(255, 255, 255, .75);
  background: rgba(0, 0, 0, .35);
}
.player .titlebar i { width: 8px; height: 8px; border-radius: 50%; background: rgba(255, 255, 255, .35); display: inline-block; }
.live-chip {
  position: absolute; left: 4%; top: 44px;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 11px; border-radius: 999px;
  font-size: 12px; font-weight: 700; letter-spacing: .04em;
  background: rgba(10, 14, 24, .6); border: 1px solid rgba(255, 255, 255, .18);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.live-chip i { width: 7px; height: 7px; border-radius: 50%; background: #ff5a5a; display: inline-block; animation: pulse 1.2s ease-in-out infinite; }
.captions {
  position: absolute; left: 6%; right: 6%; bottom: 15%;
  text-align: center;
  text-shadow: 0 1px 2px rgba(0, 0, 0, .85), 0 0 12px rgba(0, 0, 0, .6);
}
.captions .o { font-size: clamp(12px, 1.8vw, 18px); opacity: .9; line-height: 1.35; transition: opacity .3s ease; min-height: 1.35em; }
.captions .t { font-size: clamp(17px, 2.8vw, 28px); font-weight: 600; line-height: 1.35; margin-top: 4px; transition: opacity .3s ease; min-height: 1.35em; }
.captions .o.hide, .captions .t.hide { opacity: 0; }
.player .progress { position: absolute; left: 4%; right: 4%; bottom: 7%; height: 4px; border-radius: 2px; background: rgba(255, 255, 255, .22); }
.player .progress .done { position: absolute; left: 0; top: 0; bottom: 0; width: 38%; border-radius: 2px; background: var(--accent); }
.player .progress .ahead { position: absolute; left: 38%; top: 0; bottom: 0; width: 24%; border-radius: 2px; background: rgba(165, 139, 255, .85); }
.player .progress .head { position: absolute; left: 38%; top: 50%; width: 11px; height: 11px; border-radius: 50%; background: #fff; transform: translate(-50%, -50%); box-shadow: 0 0 0 3px rgba(255, 255, 255, .25); }
.demo-caption { text-align: center; margin: 16px 0 0; font-size: 14px; color: var(--ink-3); }

/* ---- 卡片 ------------------------------------------------------------ */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid, .grid.two { grid-template-columns: 1fr; } }
.card { padding: 24px 24px 22px; }
.card .ic {
  width: 42px; height: 42px; border-radius: 11px;
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 14px rgba(31, 127, 224, .25);
  margin-bottom: 16px;
}
.card .ic .i { width: 22px; height: 22px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.card p + p { margin-top: 10px; }
.card .note { font-size: 13.5px; color: var(--ink-3); }
.card .btn { margin-top: 4px; }
.chips { display: flex; gap: 6px; margin-top: 14px; flex-wrap: wrap; }
.chip { font-size: 12px; padding: 2px 9px; border-radius: 999px; background: var(--tint-3); border: 1px solid var(--line); color: var(--ink-2); font-weight: 600; line-height: 1.6; }
.chip.off { opacity: .45; text-decoration: line-through; }
.chip.warn { color: var(--warn); }

/* ---- 左右分栏（会议一节、iOS 首屏） ---------------------------------- */
.split { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(28px, 5vw, 56px); align-items: center; }
@media (max-width: 800px) { .split { grid-template-columns: 1fr; gap: 28px; } }
.points { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.points li { display: flex; gap: 12px; align-items: flex-start; }
.points li > .i { color: var(--accent); margin-top: 4px; width: 20px; height: 20px; }
.points b { display: block; font-size: 15.5px; }
.points span { color: var(--ink-2); font-size: 14.5px; display: block; }

/* 会议记录示意 */
.transcript { padding: 14px 16px 16px; display: grid; gap: 10px; }
.transcript-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; font-size: 13px; color: var(--ink-2); padding-bottom: 10px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.transcript .row { display: grid; grid-template-columns: 52px 1fr; gap: 10px; font-size: 14px; }
.transcript .who { font-size: 12px; font-weight: 700; padding: 2px 0; border-radius: 999px; height: fit-content; text-align: center; }
.who.them { background: rgba(31, 127, 224, .14); color: var(--accent); }
.who.me { background: rgba(124, 92, 255, .14); color: var(--accent-2); }
.transcript .time { font-size: 11.5px; color: var(--ink-3); font-family: var(--mono); }
.transcript .o { color: var(--ink-2); }
.transcript .t { font-weight: 600; }
.transcript .row.draft .o { font-style: italic; color: var(--ink-3); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #e04b4b; display: inline-block; animation: pulse 1.2s ease-in-out infinite; margin-right: 6px; vertical-align: 1px; }
.transcript-foot { display: flex; gap: 8px; flex-wrap: wrap; padding-top: 8px; border-top: 1px solid var(--line); }

/* ---- 平台详情页 ------------------------------------------------------ */
.page-hero { padding: clamp(40px, 6vw, 72px) 0 8px; }
.page-hero h1 { font-size: clamp(32px, 5vw, 56px); }
.page-hero .hero-cta { justify-content: flex-start; }

.phone-mock { display: flex; justify-content: center; }
.phone {
  width: 250px; max-width: 100%; aspect-ratio: 9 / 18.5;
  border-radius: 34px;
  padding: 18px 16px 16px;
  position: relative;
  background: var(--wall);
  border: 6px solid #1b1e24;
  box-shadow: 0 24px 50px rgba(20, 30, 50, .28), inset 0 0 0 1px rgba(255, 255, 255, .25);
  display: flex; flex-direction: column; gap: 8px;
  font-size: 13px; overflow: hidden;
}
@media (prefers-color-scheme: dark) { .phone { border-color: #2a2f3a; } }
.phone .notch { width: 84px; height: 22px; border-radius: 12px; background: #1b1e24; margin: 0 auto 6px; flex: none; }
.phone .ph-bar { display: flex; justify-content: space-between; font-weight: 700; font-size: 12.5px; padding: 0 2px; }
.phone .ph-src, .phone .ph-dst {
  border-radius: 12px; padding: 10px 12px;
  background: var(--sheen), var(--tint-2);
  border: 1px solid var(--rim-2);
  box-shadow: inset 1px 1px 0 var(--rim), inset -1px -1px 0 var(--shade);
}
.phone .ph-src { color: var(--ink-2); font-size: 12.5px; }
.phone .ph-dst { font-weight: 600; font-size: 15px; line-height: 1.4; }
.phone .ph-mic {
  margin-top: auto; text-align: center; font-weight: 600;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 20px rgba(31, 127, 224, .3);
  border-radius: 999px; padding: 12px;
}

/* ---- 页脚 ------------------------------------------------------------ */
footer { padding: 36px 0 48px; border-top: 1px solid var(--line); margin-top: 24px; color: var(--ink-3); font-size: 13.5px; }
.foot { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: center; }
.foot-links { display: flex; gap: 16px; flex-wrap: wrap; }
.foot-links a { color: var(--ink-2); }

/* ---- 动效 ------------------------------------------------------------ */
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .5; transform: scale(.8); } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .live-chip i, .dot, .player .scene, .scene .beam, .scene .mote { animation: none; }
  .btn:hover { transform: none; }
  .captions .o, .captions .t, .scene .slide, .scene .bar, .scene .bullet, .scene .st-badge { transition: none; }
  .scene .mote { opacity: .35; }
}

/* ---- 手机 ------------------------------------------------------------ */
@media (max-width: 900px) {
  .nav-links {
    display: none;
    position: absolute; top: 60px; left: -20px; right: -20px;
    flex-direction: column; gap: 2px;
    padding: 10px 20px 16px;
    background: var(--bg);   /* 不透明：嵌在 .nav 的 backdrop-filter 里，自己的模糊取不到页面内容 */
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a { padding: 10px 12px; font-size: 15px; }
  .only-mobile { display: block; }
  .only-desktop { display: none !important; }
  .nav-toggle { display: inline-flex; }
}
@media (max-width: 480px) {
  .nav-links { left: -16px; right: -16px; padding-inline: 16px; }
  .card { padding: 20px 18px 18px; }
  .hero-cta .btn { flex: 1 1 auto; justify-content: center; }
  .player { border-radius: 12px; }
  .live-chip { top: 38px; }
  .transcript .row { grid-template-columns: 44px 1fr; font-size: 13.5px; }
}