/* ============================================================
   Audio Talk AI — 官方网站样式
   设计语言：深色、开发者向、绿色/琥珀点缀，与产品本体一致
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景 / 表面 */
  --bg: #0d1117;
  --bg-soft: #0a0e14;
  --surface: #161b22;
  --surface-2: #1c2230;
  --border: #30363d;
  --border-soft: #21262d;

  /* 文本 */
  --text: #e6edf3;
  --text-muted: #8b949e;
  --text-dim: #6e7681;

  /* 强调色 */
  --green: #3fb950;
  --green-soft: rgba(63, 185, 80, 0.12);
  --amber: #f0b429;
  --amber-soft: rgba(240, 180, 41, 0.12);
  --cyan: #58a6ff;
  --cyan-soft: rgba(88, 166, 255, 0.12);
  --red: #f85149;

  /* 渐变 */
  --grad-hero: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(63, 185, 80, 0.18), transparent 70%),
               radial-gradient(ellipse 60% 50% at 80% 10%, rgba(240, 180, 41, 0.10), transparent 60%);

  /* 排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, "Cascadia Code",
               "Fira Code", Consolas, "Courier New", monospace;

  /* 尺寸 */
  --container: 1140px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.45);
  --glow-green: 0 0 0 1px rgba(63, 185, 80, 0.3), 0 8px 30px rgba(63, 185, 80, 0.15);

  --nav-h: 64px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 20px); }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; padding: 0; }
::selection { background: rgba(63, 185, 80, 0.3); color: #fff; }

/* ---------- 布局工具 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; position: relative; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--green); padding: 6px 14px;
  background: var(--green-soft); border: 1px solid rgba(63, 185, 80, 0.25);
  border-radius: 999px; margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }
.section-title { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; }
.section-sub { color: var(--text-muted); font-size: 1.05rem; margin-top: 16px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(13, 17, 23, 0.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--border); background: rgba(13, 17, 23, 0.88); }
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em; }
.brand img { width: 30px; height: 30px; }
.brand span { background: linear-gradient(90deg, #fff, var(--text-muted)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px; border-radius: var(--radius-sm); color: var(--text-muted);
  font-size: 0.92rem; font-weight: 500; transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.lang-toggle {
  font-family: var(--font-mono); font-size: 0.82rem; font-weight: 600;
  color: var(--text-muted); padding: 6px 10px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); transition: all 0.2s;
}
.lang-toggle:hover { color: var(--green); border-color: var(--green); }
.icon-link {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  color: var(--text-muted); border: 1px solid var(--border); transition: all 0.2s;
}
.icon-link:hover { color: var(--text); border-color: var(--text-dim); background: var(--surface); transform: translateY(-1px); }
.icon-link svg { width: 18px; height: 18px; }
.menu-btn { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; color: var(--text); border-radius: var(--radius-sm); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem;
  transition: transform 0.15s var(--ease), box-shadow 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap; border: 1px solid transparent;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, #46c75c, #2ea043);
  color: #fff; box-shadow: 0 1px 0 rgba(255,255,255,0.1) inset, 0 6px 20px rgba(46, 160, 67, 0.35);
}
.btn-primary:hover { box-shadow: 0 1px 0 rgba(255,255,255,0.1) inset, 0 8px 28px rgba(46, 160, 67, 0.5); transform: translateY(-1px); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--text-dim); background: var(--surface-2); transform: translateY(-1px); }
.btn svg { width: 18px; height: 18px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: calc(var(--nav-h) + 80px) 0 80px; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background: var(--grad-hero); pointer-events: none; z-index: 0; }
.hero-grid {
  position: absolute; inset: 0; z-index: 0; opacity: 0.4;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 75%);
}
.hero-inner { position: relative; z-index: 1; text-align: center; }
.hero-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 28px; }
.pill {
  display: inline-flex; align-items: center; gap: 7px; font-size: 0.82rem; font-weight: 500;
  color: var(--text-muted); padding: 6px 14px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 999px;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.pill.amber .dot { background: var(--amber); }
.hero h1 {
  font-size: clamp(2.4rem, 6.5vw, 4.6rem); font-weight: 900; line-height: 1.05;
  letter-spacing: -0.035em; margin-bottom: 22px;
}
.hero h1 .accent {
  background: linear-gradient(120deg, var(--green) 10%, var(--amber) 90%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero .lead { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--text-muted); max-width: 620px; margin: 0 auto 36px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-bottom: 56px; }

/* 终端 mock */
.terminal {
  max-width: 820px; margin: 0 auto; background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; text-align: left;
}
.terminal-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border); }
.terminal-bar .dots { display: flex; gap: 7px; }
.terminal-bar .dots span { width: 12px; height: 12px; border-radius: 50%; }
.terminal-bar .dots span:nth-child(1) { background: #ff5f56; }
.terminal-bar .dots span:nth-child(2) { background: #ffbd2e; }
.terminal-bar .dots span:nth-child(3) { background: #27c93f; }
.terminal-bar .title { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); margin-left: 8px; }
.terminal-body { padding: 22px 24px; font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.85; }
.terminal-body .prompt { color: var(--green); }
.terminal-body .cmd { color: var(--text); }
.terminal-body .out { color: var(--text-muted); }
.terminal-body .key { color: var(--amber); }
.terminal-body .cursor { display: inline-block; width: 8px; height: 1.05em; background: var(--green); vertical-align: text-bottom; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* hero 波形装饰 */
.waveform { display: flex; align-items: center; justify-content: center; gap: 5px; height: 64px; margin-bottom: 8px; }
.waveform span {
  width: 5px; border-radius: 3px; background: linear-gradient(180deg, var(--green), var(--amber));
  animation: wave 1.4s ease-in-out infinite;
}
.waveform span:nth-child(1) { height: 24px; animation-delay: -1.0s; }
.waveform span:nth-child(2) { height: 40px; animation-delay: -0.8s; }
.waveform span:nth-child(3) { height: 56px; animation-delay: -0.6s; }
.waveform span:nth-child(4) { height: 64px; animation-delay: -0.4s; }
.waveform span:nth-child(5) { height: 48px; animation-delay: -0.2s; }
.waveform span:nth-child(6) { height: 64px; animation-delay: 0s; }
.waveform span:nth-child(7) { height: 40px; animation-delay: -0.3s; }
.waveform span:nth-child(8) { height: 24px; animation-delay: -0.5s; }
@keyframes wave { 0%, 100% { transform: scaleY(0.4); opacity: 0.6; } 50% { transform: scaleY(1); opacity: 1; } }

/* ---------- 功能卡片 ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  position: relative; padding: 28px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  transition: transform 0.25s var(--ease), border-color 0.25s, box-shadow 0.25s;
  overflow: hidden;
}
.feature-card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity 0.3s;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%), rgba(63,185,80,0.08), transparent 60%);
  pointer-events: none;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--text-dim); box-shadow: var(--shadow); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 46px; height: 46px; border-radius: 11px; display: flex; align-items: center; justify-content: center;
  background: var(--green-soft); color: var(--green); margin-bottom: 18px; border: 1px solid rgba(63,185,80,0.2);
}
.feature-icon.amber { background: var(--amber-soft); color: var(--amber); border-color: rgba(240,180,41,0.2); }
.feature-icon.cyan { background: var(--cyan-soft); color: var(--cyan); border-color: rgba(88,166,255,0.2); }
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.feature-card p { color: var(--text-muted); font-size: 0.95rem; }

/* ---------- 服务商 ---------- */
.provider-group { margin-bottom: 36px; }
.provider-group-head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.provider-group-head h3 { font-size: 1.1rem; font-weight: 700; }
.provider-group-head .tag { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim); padding: 3px 10px; border: 1px solid var(--border); border-radius: 999px; }
.providers-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.provider-card {
  display: flex; align-items: flex-start; gap: 14px; padding: 16px 18px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  transition: border-color 0.2s, transform 0.2s var(--ease);
}
.provider-card:hover { border-color: var(--text-dim); transform: translateY(-2px); }
.provider-logo {
  flex-shrink: 0; width: 38px; height: 38px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.95rem; color: #fff;
}
.provider-info h4 { font-size: 0.95rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.provider-info p { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; line-height: 1.4; }
.badge-rec {
  font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700; letter-spacing: 0.05em;
  color: var(--amber); padding: 2px 7px; background: var(--amber-soft);
  border: 1px solid rgba(240,180,41,0.3); border-radius: 4px;
}

/* ---------- 平台 ---------- */
.platforms-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.platform-card {
  padding: 26px 22px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); transition: border-color 0.2s, transform 0.2s var(--ease);
}
.platform-card:hover { border-color: var(--text-dim); transform: translateY(-3px); }
.platform-card .ph { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.platform-card .picon { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; color: var(--text); }
.platform-card .picon svg { width: 32px; height: 32px; }
.platform-status {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600; color: var(--green);
  padding: 4px 10px; background: var(--green-soft); border: 1px solid rgba(63,185,80,0.25); border-radius: 999px;
  display: inline-flex; align-items: center; gap: 6px;
}
.platform-status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.platform-card h4 { font-size: 1.02rem; font-weight: 700; margin-bottom: 6px; }
.platform-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.55; }

/* ---------- 截图 ---------- */
.shots-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.shot {
  position: relative; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border);
  background: var(--surface); cursor: zoom-in; transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.shot:hover { transform: translateY(-4px); border-color: var(--text-dim); box-shadow: var(--shadow-lg); }
.shot img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s var(--ease); }
.shot:hover img { transform: scale(1.04); }
.shot .caption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 14px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  font-size: 0.88rem; font-weight: 600;
}
.shot .caption span { display: block; font-size: 0.76rem; font-weight: 400; color: var(--text-muted); margin-top: 2px; font-family: var(--font-mono); }

/* 灯箱 */
.lightbox {
  position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,0.92);
  display: none; align-items: center; justify-content: center; padding: 5vh 5vw;
  backdrop-filter: blur(6px);
}
.lightbox.open { display: flex; animation: fade 0.25s ease; }
@keyframes fade { from { opacity: 0; } }
.lightbox img { max-width: 100%; max-height: 90vh; border-radius: var(--radius); box-shadow: var(--shadow-lg); border: 1px solid var(--border); }
.lightbox-close { position: absolute; top: 20px; right: 24px; color: #fff; font-size: 1.6rem; width: 44px; height: 44px; border-radius: 50%; border: 1px solid rgba(255,255,255,0.2); display: flex; align-items: center; justify-content: center; }
.lightbox-close:hover { background: rgba(255,255,255,0.1); }

/* ---------- 快速开始 ---------- */
.quickstart { background: var(--bg-soft); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.os-tabs { display: flex; gap: 6px; justify-content: center; margin-bottom: 24px; flex-wrap: wrap; }
.os-tab {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px;
  border-radius: var(--radius-sm); color: var(--text-muted); font-weight: 600; font-size: 0.92rem;
  border: 1px solid var(--border); background: var(--surface); transition: all 0.2s;
}
.os-tab svg { width: 17px; height: 17px; }
.os-tab:hover { color: var(--text); }
.os-tab.active { color: #fff; border-color: var(--green); background: var(--green-soft); box-shadow: var(--glow-green); }
.os-panel { display: none; max-width: 820px; margin: 0 auto; }
.os-panel.active { display: block; animation: fade 0.3s ease; }

.code-block {
  position: relative; background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 18px; overflow: hidden;
}
.code-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--border); }
.code-head .label { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-dim); font-weight: 600; }
.copy-btn {
  display: inline-flex; align-items: center; gap: 6px; font-size: 0.78rem; font-weight: 600;
  color: var(--text-muted); padding: 5px 10px; border-radius: 6px; border: 1px solid var(--border); transition: all 0.2s;
}
.copy-btn:hover { color: var(--text); border-color: var(--text-dim); }
.copy-btn.copied { color: var(--green); border-color: var(--green); }
.copy-btn svg { width: 14px; height: 14px; }
.code-block pre { padding: 18px 20px; overflow-x: auto; font-family: var(--font-mono); font-size: 0.86rem; line-height: 1.7; }
.code-block pre .c { color: var(--text-dim); }      /* comment */
.code-block pre .k { color: var(--amber); }         /* keyword/cmd */
.code-block pre .s { color: var(--green); }         /* string/success */
.code-block pre .p { color: var(--cyan); }          /* path/param */
.code-block pre .v { color: var(--text); }          /* plain */

/* 配置说明卡片 */
.notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; max-width: 820px; margin: 28px auto 0; }
.note {
  padding: 18px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.note .nk { font-family: var(--font-mono); font-size: 0.72rem; color: var(--cyan); font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 6px; }
.note .nv { font-size: 0.9rem; color: var(--text); font-weight: 600; }
.note .nd { font-size: 0.82rem; color: var(--text-muted); margin-top: 4px; }

/* ---------- 统计带 ---------- */
.stats-band {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  padding: 40px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
}
.stat { text-align: center; }
.stat .num { font-family: var(--font-mono); font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; color: var(--amber); line-height: 1; }
.stat .lbl { font-size: 0.85rem; color: var(--text-muted); margin-top: 8px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 56px 0 36px; background: var(--bg-soft); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 320px; }
.footer-col h5 { font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-dim); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; transition: color 0.2s; }
.footer-col a:hover { color: var(--green); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding-top: 28px; border-top: 1px solid var(--border); }
.footer-bottom p { color: var(--text-dim); font-size: 0.82rem; }
.footer-bottom .license { display: inline-flex; align-items: center; gap: 6px; color: var(--amber); font-family: var(--font-mono); font-size: 0.78rem; }

/* 图标不收缩、按基线对齐，避免 flex 容器里被挤压或错位（跨浏览器稳健） */
.btn svg, .icon-link svg, .feature-icon svg, .dl-btn svg, .os-tab svg, .platform-card .picon svg { flex-shrink: 0; }

/* ---------- 下载按钮行 ---------- */
.dl-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; max-width: 820px; margin: 0 auto 22px; }
.dl-btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px;
  border-radius: var(--radius-sm); font-weight: 600; font-size: 0.88rem;
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  transition: transform 0.15s var(--ease), border-color 0.2s, color 0.2s, background 0.2s;
}
.dl-btn:hover { transform: translateY(-1px); border-color: var(--green); color: var(--green); background: var(--surface-2); }
.dl-btn svg { width: 16px; height: 16px; }
.dl-btn .arch { font-family: var(--font-mono); font-size: 0.74rem; color: var(--text-muted); }
.dl-btn.more { color: var(--text-muted); font-size: 0.84rem; }
.dl-btn.more:hover { color: var(--green); }

/* ---------- 滚动入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .platforms-grid { grid-template-columns: repeat(2, 1fr); }
  .shots-grid { grid-template-columns: 1fr; }
  .notes { grid-template-columns: 1fr; }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .nav-links { display: none; }
  .menu-btn { display: flex; }
  .nav-actions .lang-toggle { display: none; }
  /* 移动菜单展开 */
  .nav-links.open {
    display: flex; flex-direction: column; position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 16px 24px; gap: 4px; align-items: stretch;
  }
  .nav-links.open a { padding: 12px 14px; }
  .features-grid { grid-template-columns: 1fr; }
  .platforms-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .stats-band { padding: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}