/* =========================================================
   ExpressAssistant Web — main.css
   深色科技风 · Glassmorphism · 响应式
   ========================================================= */

/* ---------- Design Tokens ---------- */
:root {
  --bg-0: #080D18;
  --bg-1: #101827;
  --card: rgba(255, 255, 255, 0.05);
  --card-strong: rgba(255, 255, 255, 0.08);
  --accent: #648BFF;
  --accent-2: #9275FF;
  --text-h: #F5F7FF;
  --text-b: #A5B0C2;
  --line: rgba(255, 255, 255, 0.10);

  --grad: linear-gradient(120deg, var(--accent), var(--accent-2));

  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 24px;

  /* 动效（统一缓动 + 时长阶梯） */
  --ease-std: cubic-bezier(.4, 0, .2, 1);
  --ease-in: cubic-bezier(.22, 1, .36, 1);
  --t-micro: 120ms;
  --t-hover: 180ms;
  --t-state: 260ms;
  --t-enter: 420ms;

  --container: 1180px;
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; overflow-x: clip; }
body {
  background: var(--bg-0);
  color: var(--text-b);
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
h1, h2, h3, h4 { color: var(--text-h); line-height: 1.25; font-weight: 700; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.container { width: min(var(--container), 100% - 48px); margin-inline: auto; }
.section { padding: 96px 0; position: relative; }
.text-gradient {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 背景装饰 ---------- */
.bg-decor { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.bg-glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; will-change: transform; }
.bg-glow--1 { width: 560px; height: 560px; top: -160px; left: -120px;
  background: radial-gradient(circle, rgba(100,139,255,.35), transparent 70%);
  animation: drift 26s var(--ease-std) infinite alternate; }
.bg-glow--2 { width: 520px; height: 520px; top: 30%; right: -180px;
  background: radial-gradient(circle, rgba(146,117,255,.28), transparent 70%);
  animation: drift 32s var(--ease-std) infinite alternate-reverse; }
.bg-glow--3 { width: 480px; height: 480px; bottom: -160px; left: 25%;
  background: radial-gradient(circle, rgba(100,139,255,.18), transparent 70%);
  animation: drift 38s var(--ease-std) infinite alternate; }
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(60px, -40px, 0) scale(1.12); }
}
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 0%, transparent 70%);
  opacity: .35;
}

/* 品牌文字水印（斜排平铺，低透明度） */
.bg-watermark {
  position: absolute; inset: -30%;
  background-repeat: repeat;
  background-position: center;
  opacity: .055;
  transform: rotate(-14deg);
  pointer-events: none;
}

/* ---------- 占位组件（统一规范） ---------- */
.ph {
  display: flex; align-items: center; justify-content: center;
  border: 1.5px dashed rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-m);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(255, 255, 255, 0.38);
  font-size: 13px; letter-spacing: .06em;
  text-align: center; padding: 12px;
  min-height: 44px;
  transition: border-color var(--t-hover) var(--ease-std),
              background-color var(--t-hover) var(--ease-std);
}
.ph:hover { border-color: rgba(255,255,255,.4); background: rgba(255,255,255,.05); }
.ph::before { content: "▢ "; opacity: .7; }
.ph--logo { border-radius: var(--radius-s); font-weight: 700; flex: none; }
.ph--shot { aspect-ratio: var(--ph-ratio, 9 / 19.5); width: 100%; flex-direction: column; }
.ph--wide { width: 100%; aspect-ratio: var(--ph-ratio, 16 / 9); }
.ph--chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 999px; font-size: 13px;
}

/* ---------- Logo 徽章（原图为白底，用白色圆角容器承托） ---------- */
.logo-badge {
  display: inline-flex; align-items: center; justify-content: center;
  background: #fff; border-radius: 12px; overflow: hidden; flex: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .35);
}
.logo-badge img { width: 100%; height: 100%; object-fit: cover; }
.brand__logo { width: 36px; height: 36px; }
.brand__logo img { transform: scale(1.18); }
.download-card__logo { width: 88px; height: 88px; border-radius: 20px; }
.footer__brand .logo-badge { width: 40px; height: 40px; }
.footer__brand .logo-badge img { transform: scale(1.18); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border-radius: 999px;
  font-size: 15px; font-weight: 600; color: var(--text-h);
  border: 1px solid transparent; cursor: pointer;
  transition: transform var(--t-hover) var(--ease-std),
              box-shadow var(--t-hover) var(--ease-std),
              background-color var(--t-hover) var(--ease-std),
              border-color var(--t-hover) var(--ease-std),
              opacity var(--t-micro) var(--ease-std);
  will-change: transform;
}
.btn:active { transform: scale(.97); }
.btn--primary { background: var(--grad); box-shadow: 0 8px 24px rgba(100, 139, 255, .30); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(100, 139, 255, .42); }
.btn--ghost { background: rgba(255,255,255,.04); border-color: var(--line); }
.btn--ghost:hover { transform: translateY(-2px); background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.24); }
.btn--sm { padding: 8px 20px; font-size: 14px; }
.btn--lg { padding: 15px 36px; font-size: 16px; }
.btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }
.btn[aria-disabled="true"]:hover { transform: none; box-shadow: 0 8px 24px rgba(100,139,255,.30); }

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background-color var(--t-state) var(--ease-std),
              border-color var(--t-state) var(--ease-std),
              backdrop-filter var(--t-state) var(--ease-std);
  border-bottom: 1px solid transparent;
}
.navbar.is-scrolled {
  background: rgba(8, 13, 24, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}
.navbar__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 24px; }

.brand { display: flex; align-items: center; gap: 12px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__text strong { color: var(--text-h); font-size: 16px; }
.brand__text small { color: var(--text-b); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
  display: block; padding: 8px 14px; border-radius: 999px;
  font-size: 14.5px; color: var(--text-b);
  transition: color var(--t-hover) var(--ease-std),
              background-color var(--t-hover) var(--ease-std);
}
.nav-link:hover { color: var(--text-h); background: rgba(255,255,255,.06); }
.nav-link.is-active { color: var(--text-h); background: rgba(100,139,255,.16); }
.nav-menu__cta { margin-left: 12px; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: 0; padding: 10px; cursor: pointer;
}
.nav-toggle span {
  width: 22px; height: 2px; background: var(--text-h); border-radius: 2px;
  transition: transform var(--t-state) var(--ease-std), opacity var(--t-state) var(--ease-std);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { padding: 170px 0 110px; min-height: 92vh; display: flex; align-items: center; }
.hero__grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero__badge {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  background: rgba(100,139,255,.12); border: 1px solid rgba(100,139,255,.25);
  color: #AEC2FF; font-size: 13px; margin-bottom: 22px;
}
.hero__title { font-size: clamp(38px, 5.2vw, 60px); letter-spacing: -.01em; margin-bottom: 18px; }
.hero__subtitle { font-size: 19px; color: var(--text-h); font-weight: 500; margin-bottom: 10px; }
.hero__desc { max-width: 46ch; margin-bottom: 30px; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 10px 26px; font-size: 13.5px; }
.hero__meta li { display: flex; align-items: center; gap: 7px; }
.meta-ico { font-size: 15px; }

/* 手机堆叠 */
.hero__phones { position: relative; min-height: 560px; }
.phone-stack { position: relative; height: 560px; }
.phone {
  position: absolute; width: 218px; aspect-ratio: 9 / 19.5;
  border-radius: 34px; background: #0B1120;
  border: 2px solid rgba(255,255,255,.14);
  box-shadow: 0 30px 70px rgba(0,0,0,.55), inset 0 0 0 6px #050912;
  overflow: hidden;
  transition: transform var(--t-state) var(--ease-in);
}
.phone__screen { position: absolute; inset: 8px; border-radius: 26px; overflow: hidden; background: #fff; }
.phone__screen img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.phone__notch {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%);
  width: 70px; height: 18px; border-radius: 999px; background: #050912; z-index: 2;
}
.phone--main { left: 50%; top: 20px; transform: translateX(-50%); z-index: 3; }
.phone--main:hover { transform: translateX(-50%) translateY(-6px); }
.phone--back { top: 60px; z-index: 1; opacity: .8; width: 196px; }
.phone--back.phone--left { left: 6%; transform: rotate(-8deg); }
.phone--back.phone--right { right: 6%; transform: rotate(8deg); }
.phone--back:hover { transform: rotate(-8deg) translateY(-4px); }
.phone--back.phone--right:hover { transform: rotate(8deg) translateY(-4px); }

.float-tag {
  position: absolute; z-index: 4;
  padding: 8px 16px; border-radius: 999px; font-size: 13px; color: var(--text-h);
  background: rgba(16, 24, 39, 0.8);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 10px 26px rgba(0,0,0,.4);
  animation: floaty 5s var(--ease-std) infinite alternate;
  will-change: transform;
}
.float-tag--1 { top: 12%; left: -2%; }
.float-tag--2 { top: 46%; right: -3%; animation-delay: -1.8s; }
.float-tag--3 { bottom: 8%; left: 8%; animation-delay: -3.4s; }
@keyframes floaty {
  from { transform: translateY(-5px); }
  to   { transform: translateY(6px); }
}

/* ---------- 区块标题 ---------- */
.section__head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section__kicker {
  font-size: 13px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 12px;
}
.section__title { font-size: clamp(28px, 3.6vw, 42px); margin-bottom: 14px; }
.section__desc { max-width: 60ch; margin-inline: auto; }

/* ---------- 卡片通用 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  padding: 28px;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: transform var(--t-hover) var(--ease-std),
              border-color var(--t-hover) var(--ease-std),
              box-shadow var(--t-hover) var(--ease-std);
  will-change: transform;
}
.card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,.22); box-shadow: 0 18px 44px rgba(0,0,0,.35); }

/* ---------- 产品介绍 ---------- */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: stretch; }
.about-grid__media { display: flex; align-items: flex-start; justify-content: center; overflow: hidden; border-radius: var(--radius-l); }
.about-shot {
  width: min(100%, 300px); aspect-ratio: 9 / 16;
  object-fit: cover; object-position: top center;
  border: 1px solid var(--line); border-radius: var(--radius-l);
  transition: transform var(--t-state) var(--ease-in);
}
.about-grid__media:hover .about-shot { transform: scale(1.02); }
.about-grid__cards { display: grid; gap: 20px; align-content: center; }
.card--intro .card__ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 14px; font-size: 22px;
  background: rgba(100,139,255,.14); border: 1px solid rgba(100,139,255,.28);
  margin-bottom: 14px;
}
.card--intro h3 { font-size: 18px; margin-bottom: 8px; }
.card--intro p { font-size: 14.5px; }

/* ---------- 功能网格 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card { display: flex; flex-direction: column; gap: 12px; }
.feature-card__ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 14px; font-size: 24px;
  background: var(--grad); color: #fff;
  box-shadow: 0 6px 18px rgba(100,139,255,.3);
}
.feature-card h3 { font-size: 16.5px; }
.feature-card p { font-size: 13.5px; flex: 1; }
.feature-shot {
  width: 100%; aspect-ratio: 9 / 16; object-fit: cover; object-position: top;
  border: 1px solid var(--line); border-radius: var(--radius-s); background: #fff;
  transition: transform var(--t-hover) var(--ease-std), border-color var(--t-hover) var(--ease-std);
}
.feature-card:hover .feature-shot { transform: translateY(-3px); border-color: rgba(255,255,255,.35); }

/* ---------- 截图自动滚动轮播（无缝循环） ---------- */
.shots-scroller {
  overflow: hidden;
  padding: 8px 4px 22px;
  /* 左右渐隐遮罩 */
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.shots-track {
  display: flex; gap: 22px; width: max-content;
  animation: shots-marquee 42s linear infinite;
  will-change: transform;
}
.shots-track:hover { animation-play-state: paused; }
.shots-track.is-paused { animation-play-state: paused; }
@keyframes shots-marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.shot { flex: 0 0 218px; text-align: center; }
.shot img {
  width: 100%; aspect-ratio: 9 / 19.5; object-fit: cover; object-position: top;
  border: 1.5px solid var(--line); border-radius: var(--radius-m);
  background: #fff;
  transition: transform var(--t-hover) var(--ease-std), border-color var(--t-hover) var(--ease-std);
}
.shot:hover img { transform: translateY(-5px); border-color: rgba(255,255,255,.4); }
.shot p { margin-top: 10px; font-size: 14px; color: var(--text-b); }

/* ---------- 下载中心 ---------- */
.download-card {
  display: flex; flex-direction: column; gap: 28px;
  background: linear-gradient(150deg, rgba(100,139,255,.14), rgba(146,117,255,.08) 55%, rgba(255,255,255,.04));
  border: 1px solid rgba(100,139,255,.3);
  border-radius: var(--radius-l);
  padding: 40px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.download-card__info { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.download-card__info h3 { font-size: 24px; }
.download-card__info h3 small { font-size: 14px; color: var(--text-b); font-weight: 500; margin-left: 8px; letter-spacing: .04em; }
.dl-meta { display: flex; flex-wrap: wrap; gap: 8px 28px; margin-top: 10px; font-size: 14px; }
.dl-meta div { display: flex; gap: 6px; }
.dl-meta dt { color: rgba(255,255,255,.45); }
.dl-meta dd { color: var(--text-h); font-weight: 600; }
.download-card__actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.download-card__note { width: 100%; font-size: 13px; color: rgba(255,255,255,.45); }

.versions { margin-top: 22px; display: grid; gap: 12px; }
.version-row {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 16px 22px; border-radius: var(--radius-m);
  background: var(--card); border: 1px solid var(--line);
  font-size: 14px;
}
.version-row strong { color: var(--text-h); }
.version-row .tag { font-size: 12px; padding: 2px 10px; border-radius: 999px; background: rgba(100,139,255,.16); color: #AEC2FF; }
.version-row .spacer { flex: 1; }

/* ---------- 更新日志时间线 ---------- */
.timeline { position: relative; max-width: 760px; margin-inline: auto; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--accent), rgba(146,117,255,.15));
  border-radius: 2px;
}
.log-item { position: relative; padding-bottom: 34px; }
.log-item:last-child { padding-bottom: 0; }
.log-item::before {
  content: ""; position: absolute; left: -33px; top: 7px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg-0); border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(100,139,255,.15);
}
.log-item--planned::before { border-color: rgba(255,255,255,.3); box-shadow: none; }
.log-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 6px; }
.log-head h3 { font-size: 19px; }
.log-date { font-size: 13px; color: rgba(255,255,255,.45); }
.tag { font-size: 12px; padding: 2px 10px; border-radius: 999px; background: rgba(100,139,255,.16); color: #AEC2FF; }
.tag--major { background: rgba(146,117,255,.2); color: #CBB8FF; }
.tag--planned { background: rgba(255,255,255,.08); color: var(--text-b); }
.log-body { font-size: 14.5px; }
.log-body ul { padding-left: 18px; list-style: disc; display: grid; gap: 4px; }

/* ---------- 公告 ---------- */
.ann-list { max-width: 760px; margin-inline: auto; display: grid; gap: 14px; }
.ann-empty {
  text-align: center; padding: 56px 24px;
  border: 1.5px dashed rgba(255,255,255,.18); border-radius: var(--radius-l);
  color: rgba(255,255,255,.45); font-size: 15px;
  background: rgba(255,255,255,.02);
}
.ann-item { display: flex; flex-direction: column; gap: 6px; }
.ann-item__head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ann-item h3 { font-size: 16.5px; flex: 1; }
.ann-item p { font-size: 14px; }
.ann-item a, .ann-item .ann-more { font-size: 13.5px; color: var(--accent); }
.ann-item a:hover { text-decoration: underline; }

/* ---------- 关于项目 ---------- */
.about-project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: start; }
.card--project h3 { font-size: 17px; margin-bottom: 16px; }
.kv { display: grid; gap: 10px; font-size: 14.5px; }
.kv div { display: flex; justify-content: space-between; gap: 12px; border-bottom: 1px dashed var(--line); padding-bottom: 9px; }
.kv dt { color: rgba(255,255,255,.45); flex: none; }
.kv dd { color: var(--text-h); text-align: right; }
.link-list { display: grid; gap: 10px; }
.link-item {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px; border-radius: var(--radius-s);
  background: rgba(255,255,255,.04); border: 1px solid var(--line);
  font-size: 14.5px; color: var(--text-b); word-break: break-all;
  transition: transform var(--t-hover) var(--ease-std),
              background-color var(--t-hover) var(--ease-std),
              border-color var(--t-hover) var(--ease-std), color var(--t-hover) var(--ease-std);
}
.link-item:hover { transform: translateX(3px); background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.22); color: var(--text-h); }
.link-arrow { margin-left: auto; color: var(--accent); flex: none; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 52px 0 30px; background: rgba(255,255,255,.015); }
.footer__grid { display: flex; justify-content: space-between; align-items: center; gap: 28px; flex-wrap: wrap; }
.footer__brand { display: flex; align-items: center; gap: 16px; }
.footer__brand strong { color: var(--text-h); }
.footer__brand span { font-size: 13.5px; }
.footer__nav { display: flex; align-items: center; gap: 8px 18px; flex-wrap: wrap; font-size: 14px; }
.footer__nav a:hover { color: var(--text-h); }
.footer__bottom {
  margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 13px; color: rgba(255,255,255,.4);
}

/* ---------- 滚动渐入动画 ---------- */
.reveal { opacity: 0; transform: translateY(16px); }
.reveal.is-in {
  opacity: 1; transform: none;
  transition: opacity var(--t-enter) var(--ease-in), transform var(--t-enter) var(--ease-in);
  transition-delay: var(--reveal-delay, 0ms);
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .about-project-grid { grid-template-columns: 1fr 1fr; }
  .hero__grid { grid-template-columns: 1fr; gap: 20px; }
  .hero { padding-top: 130px; min-height: auto; }
  .hero__phones { min-height: 520px; max-width: 520px; margin-inline: auto; width: 100%; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
  .section { padding: 68px 0; }
  html { scroll-padding-top: 72px; }

  /* 移动端菜单 */
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; top: 68px; left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 18px 22px 24px;
    background: rgba(8,13,24,.92);
    backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    opacity: 0; transform: translateY(-8px); pointer-events: none;
    transition: opacity var(--t-state) var(--ease-std), transform var(--t-state) var(--ease-std);
  }
  .nav-menu.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .nav-link { padding: 12px 14px; font-size: 15.5px; }
  .nav-menu__cta { margin: 10px 0 0; }
  .nav-menu__cta .btn { width: 100%; }

  .hero { padding-top: 118px; }
  .hero__title { font-size: clamp(32px, 9vw, 40px); }
  .hero__phones { min-height: 460px; }
  .phone-stack { height: 460px; }
  .phone { width: 178px; }
  .phone--back { width: 158px; }
  .float-tag--1 { left: 0; } .float-tag--2 { right: 0; }

  .feature-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .feature-card { padding: 20px; }
  .about-project-grid { grid-template-columns: 1fr; }
  .download-card { padding: 26px; }
  .download-card__actions .btn { width: 100%; }
  .timeline { padding-left: 28px; }
  .log-item::before { left: -27px; }
  .footer__grid { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 430px) {
  .feature-grid { grid-template-columns: 1fr; }
  .phone--back { display: none; }
  .phone--main { width: 200px; }
}

/* ---------- 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .bg-glow { animation: none; }
  .float-tag { animation: none; }
  /* 轮播改回手动横向滚动 */
  .shots-track { animation: none !important; width: auto; }
  .shots-scroller { overflow-x: auto; mask-image: none; -webkit-mask-image: none; }
}

/* ---------- 内联 SVG 图标（去 emoji） ---------- */
.ico { width: 20px; height: 20px; display: block; flex: none; }

.feature-card__ico { display: flex; align-items: center; justify-content: center; }
.feature-card__ico .ico { width: 22px; height: 22px; color: #fff; }

.card--intro .card__ico { display: flex; align-items: center; justify-content: center; }
.card--intro .card__ico .ico { width: 22px; height: 22px; color: var(--accent); }

.hero__meta .meta-ico { display: inline-flex; align-items: center; }
.hero__meta .meta-ico .ico { width: 15px; height: 15px; color: var(--accent); }

.float-tag { display: flex; align-items: center; gap: 7px; }
.tag-ico { display: inline-flex; }
.tag-ico .ico { width: 14px; height: 14px; color: var(--accent); }

.btn-ico { display: inline-flex; }
.btn-ico .ico { width: 18px; height: 18px; }

.link-item__ico { display: inline-flex; color: var(--accent); }
.link-item__ico .ico { width: 16px; height: 16px; }

.ann-empty { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.ann-empty .ico { width: 30px; height: 30px; color: rgba(255, 255, 255, .4); }