:root {
  --bg: #080b12;
  --bg-2: #0d121d;
  --panel: #111827;
  --panel-2: #151d2e;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --text: #f2f5ff;
  --muted: #99a3b8;
  --dim: #6f7a90;
  --blue: #5b8cff;
  --blue-deep: #3763d8;
  --cyan: #74d2f3;
  --green: #5bd1b0;
  --amber: #ffb300;
  --max: 1180px;
  --radius: 22px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.no-scroll { overflow: hidden; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

::selection { background: rgba(91, 140, 255, 0.35); color: #fff; }

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

.container {
  width: min(var(--max), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  transition: top 0.2s;
}
.skip-link:focus { top: 16px; }

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(8, 11, 18, 0.62);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: background 0.25s, border-color 0.25s;
}
.site-header.scrolled {
  background: rgba(8, 11, 18, 0.92);
  border-bottom-color: var(--line);
}

.nav-inner {
  height: 72px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
}
.brand img {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  box-shadow: 0 6px 20px rgba(116, 210, 243, 0.22);
}
.brand-name { font-weight: 700; letter-spacing: -0.01em; }
.brand-tag {
  margin-left: 2px;
  padding: 2px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  color: var(--muted);
  font-size: 14px;
}
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s, border-color 0.2s,
    box-shadow 0.2s, color 0.2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #4d7ef0);
  box-shadow: 0 12px 30px rgba(91, 140, 255, 0.3);
}
.btn-primary:hover { box-shadow: 0 16px 40px rgba(91, 140, 255, 0.4); }

.btn-ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line-strong);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.075); }

.btn-small { min-height: 36px; padding: 0 14px; font-size: 13px; border-radius: 10px; }
.btn-lg { min-height: 52px; padding: 0 24px; font-size: 15px; border-radius: 14px; }
.btn-icon { font-size: 17px; line-height: 1; }
.btn.is-disabled {
  cursor: not-allowed;
  opacity: 0.82;
  box-shadow: none;
}
.btn.is-disabled:hover { transform: none; }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: 96px 0 60px;
  overflow: hidden;
}
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(10px);
  pointer-events: none;
}
.hero::before {
  width: 700px;
  height: 700px;
  right: -220px;
  top: -260px;
  background: radial-gradient(circle, rgba(91, 140, 255, 0.2), transparent 66%);
}
.hero::after {
  width: 620px;
  height: 620px;
  left: -300px;
  bottom: -300px;
  background: radial-gradient(circle, rgba(116, 210, 243, 0.11), transparent 68%);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.03fr 0.97fr;
  align-items: center;
  gap: 58px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
  color: #c4cee4;
  font-size: 12px;
  letter-spacing: 0.02em;
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(91, 209, 176, 0.12);
}

.hero h1 {
  margin: 0;
  font-size: clamp(46px, 6.4vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.045em;
  font-weight: 750;
}
.grad {
  background: linear-gradient(100deg, #eaf1ff 10%, var(--cyan) 48%, var(--blue) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  max-width: 570px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  color: var(--dim);
  font-size: 12.5px;
}
.sep { color: rgba(255, 255, 255, 0.18); }

.hero-note {
  margin-top: 14px;
  color: #7f8aa2;
  font-size: 12.5px;
}

.hero-visual {
  position: relative;
  min-width: 0;
}
.hero-visual .glow {
  position: absolute;
  inset: 10% -8% -6% 6%;
  border-radius: 40px;
  background: radial-gradient(ellipse at 50% 50%, rgba(91, 140, 255, 0.3), transparent 68%);
  filter: blur(30px);
}

.device {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 18px;
  background: #0b101a;
  box-shadow: var(--shadow);
  transform: rotate(-1.4deg);
}
.device-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  background: #101725;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.device-bar span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}
.device-bar em {
  margin-left: 10px;
  color: #7d8aa4;
  font-size: 11px;
  font-style: normal;
  letter-spacing: 0.02em;
}
.device img { width: 100%; height: auto; }

.app-icon-float {
  position: absolute;
  right: -18px;
  bottom: -26px;
  width: 112px;
  height: 112px;
  border: 4px solid #0a0e16;
  border-radius: 26px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
  transform: rotate(4deg);
}

.float-chip {
  position: absolute;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  background: rgba(13, 18, 29, 0.82);
  color: #cbd4e6;
  font-size: 11.5px;
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.28);
}
.chip-1 { left: -22px; top: 16%; animation: floaty 6s ease-in-out infinite; }
.chip-2 {
  right: 8%;
  top: -18px;
  color: #ffe0a6;
  border-color: rgba(255, 179, 0, 0.3);
  animation: floaty 7s ease-in-out infinite reverse;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ============ 指标条 ============ */
.stat-strip {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 72px;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--line);
}
.stat-strip > div {
  padding: 22px 24px;
  background: rgba(13, 18, 29, 0.82);
}
.stat-strip strong {
  display: block;
  font-size: 27px;
  letter-spacing: -0.02em;
}
.stat-strip span { color: var(--dim); font-size: 12.5px; }

/* ============ 通用 section ============ */
.section { position: relative; padding: 104px 0; }
.section-tight { padding: 76px 0; }

.section-head {
  max-width: 720px;
  margin-bottom: 44px;
}
.section-kicker {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.035em;
}
.section-head p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
}

/* ============ 功能 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature-card {
  position: relative;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(21, 29, 46, 0.88), rgba(13, 18, 29, 0.86));
  transition: transform 0.3s var(--ease), border-color 0.3s, background 0.3s;
  overflow: hidden;
}
.feature-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(91, 140, 255, 0.1), transparent 55%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(116, 210, 243, 0.3);
  background: linear-gradient(180deg, rgba(25, 34, 54, 0.95), rgba(14, 20, 33, 0.92));
}
.feature-card:hover::after { opacity: 1; }

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(116, 210, 243, 0.2);
  border-radius: 13px;
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.2), rgba(116, 210, 243, 0.08));
  color: var(--cyan);
}
.feature-icon svg { width: 23px; height: 23px; }

.feature-card h3 {
  margin: 18px 0 8px;
  font-size: 18px;
  letter-spacing: -0.015em;
}
.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}
.feature-list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  color: #aeb9cf;
  font-size: 12.5px;
}
.feature-list li {
  display: flex;
  gap: 8px;
  padding: 5px 0;
}
.feature-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--blue);
}

.tag {
  display: inline-flex;
  margin-top: 16px;
  padding: 3px 9px;
  border: 1px solid rgba(255, 179, 0, 0.3);
  border-radius: 999px;
  color: #ffd17a;
  background: rgba(255, 179, 0, 0.08);
  font-size: 10.5px;
  letter-spacing: 0.04em;
}

/* ============ 截图 ============ */
.shots {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.shot-card {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  overflow: hidden;
  cursor: zoom-in;
  text-align: left;
  transition: transform 0.35s var(--ease), border-color 0.35s, box-shadow 0.35s;
}
.shot-card:hover {
  transform: translateY(-6px);
  border-color: rgba(116, 210, 243, 0.35);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.4);
}
.shot-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s var(--ease);
}
.shot-card:hover img { transform: scale(1.025); }
.shot-caption {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px 15px;
  border-top: 1px solid var(--line);
  background: rgba(13, 18, 29, 0.92);
}
.shot-caption strong { font-size: 13px; }
.shot-caption em {
  color: #aab5ca;
  font-style: normal;
  font-size: 11.5px;
}

/* ============ 流程 ============ */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  counter-reset: step;
}
.flow-step {
  position: relative;
  padding: 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 18, 29, 0.68);
  overflow: hidden;
}
.flow-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(91, 140, 255, 0.3);
  border-radius: 10px;
  background: rgba(91, 140, 255, 0.1);
  color: #a9c0ff;
  font-size: 12px;
  font-weight: 700;
}
.flow-step h3 { margin: 16px 0 6px; font-size: 17px; }
.flow-step p { margin: 0; color: var(--muted); font-size: 13.5px; }
.flow-step::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(91, 140, 255, 0.12), transparent 70%);
}

/* ============ 下载 ============ */
.download-section {
  padding: 40px 0 104px;
}
.download-card {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
  align-items: center;
  padding: 38px;
  border: 1px solid transparent;
  border-radius: 26px;
  background:
    linear-gradient(135deg, rgba(19, 27, 44, 0.98), rgba(11, 16, 26, 0.98)) padding-box,
    linear-gradient(120deg, rgba(91, 140, 255, 0.6), rgba(116, 210, 243, 0.28), rgba(255, 255, 255, 0.06)) border-box;
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.35);
}
.download-card h2 {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 40px);
  letter-spacing: -0.035em;
}
.download-card > div > p:not(.eyebrow) {
  max-width: 560px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14.5px;
}
.download-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.download-meta span {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #aeb9cf;
  background: rgba(255, 255, 255, 0.03);
  font-size: 11.5px;
}
.download-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
}
.download-actions .small {
  margin: 0;
  color: var(--dim);
  font-size: 11.5px;
  text-align: center;
  line-height: 1.6;
}
.dl-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  align-self: flex-start;
  margin-bottom: 4px;
  padding: 4px 10px;
  border: 1px solid rgba(91, 209, 176, 0.3);
  border-radius: 999px;
  color: #9be8d2;
  background: rgba(91, 209, 176, 0.08);
  font-size: 10.5px;
  letter-spacing: 0.06em;
}

.install-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.install-step {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(13, 18, 29, 0.55);
}
.install-step strong { display: block; font-size: 13px; margin-bottom: 5px; }
.install-step p { margin: 0; color: var(--dim); font-size: 12px; line-height: 1.7; }
.sha {
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  color: #8590a7;
  font-size: 11px;
  word-break: break-all;
  background: rgba(255, 255, 255, 0.02);
}
.sha code { color: #c3cde1; font-size: 11px; }

/* ============ 隐私 ============ */
.privacy-card {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 30px 32px;
  border: 1px solid rgba(91, 209, 176, 0.18);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(19, 38, 38, 0.45), rgba(13, 18, 29, 0.68));
}
.privacy-icon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border: 1px solid rgba(91, 209, 176, 0.25);
  border-radius: 16px;
  background: rgba(91, 209, 176, 0.08);
  color: var(--green);
}
.privacy-icon svg { width: 26px; height: 26px; }
.privacy-copy { flex: 1; }
.privacy-copy h2 { margin: 0 0 6px; font-size: 20px; }
.privacy-copy p { margin: 0; color: var(--muted); font-size: 13.5px; }
.privacy-card .btn { flex: 0 0 auto; }

/* ============ FAQ ============ */
.faq-list {
  border-top: 1px solid var(--line);
}
.faq-item {
  border-bottom: 1px solid var(--line);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 21px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  color: var(--cyan);
  font-size: 21px;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.2s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
  margin: 0;
  padding: 0 2px 22px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  max-width: 800px;
}

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 52px 0 40px;
  background: #070a10;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.footer-brand strong { font-size: 15px; }
.footer-col p { margin: 0; color: var(--dim); font-size: 12.5px; line-height: 1.8; }
.footer-col h4 {
  margin: 0 0 12px;
  color: #cdd6e8;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.footer-col a { display: block; padding: 4px 0; color: var(--muted); font-size: 13px; }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 11.5px;
}
.footer-bottom a { color: #aab5ca; }

/* ============ 隐私政策页 ============ */
.legal-page { padding: 72px 0 96px; }
.legal {
  max-width: 860px;
  margin-inline: auto;
  padding: 46px 50px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(19, 26, 42, 0.96), rgba(11, 16, 26, 0.96));
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.25);
}
.legal h1 { margin: 0 0 8px; font-size: clamp(30px, 4vw, 42px); letter-spacing: -0.035em; }
.legal-meta { margin: 0 0 28px; color: var(--dim); font-size: 12.5px; }
.legal h2 { margin: 34px 0 8px; font-size: 18px; letter-spacing: -0.01em; }
.legal p, .legal li { color: #bcc6d9; font-size: 14px; line-height: 1.9; }
.legal ul { padding-left: 20px; }
.legal li { margin: 4px 0; }
.legal a { color: #9bb8ff; text-decoration: underline; text-underline-offset: 3px; }
.legal .box {
  padding: 16px 18px;
  border: 1px solid rgba(91, 140, 255, 0.2);
  border-radius: 12px;
  background: rgba(91, 140, 255, 0.06);
}
.legal code {
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.07);
  color: #e5ebf8;
  font-size: 12px;
}
.legal-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 12.5px;
}
.legal-back:hover { color: var(--text); }
.contact-line { color: #9aa5ba; font-size: 13px; }

/* ============ 灯箱 ============ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  padding: 28px;
  background: rgba(3, 5, 9, 0.88);
  backdrop-filter: blur(12px);
}
.lightbox img {
  max-width: min(92vw, 900px);
  max-height: 82vh;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.6);
}
.lightbox p { margin: 0; color: #c9d2e4; font-size: 13px; }
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

/* ============ 动画 ============ */
.js .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s var(--ease);
}
.js .reveal.in { opacity: 1; transform: none; }

.feature-grid .reveal:nth-child(2),
.flow-grid .reveal:nth-child(2),
.shots .reveal:nth-child(2) { transition-delay: 0.06s; }
.feature-grid .reveal:nth-child(3),
.flow-grid .reveal:nth-child(3),
.shots .reveal:nth-child(3) { transition-delay: 0.12s; }
.feature-grid .reveal:nth-child(4),
.shots .reveal:nth-child(4) { transition-delay: 0.18s; }
.feature-grid .reveal:nth-child(5) { transition-delay: 0.24s; }
.feature-grid .reveal:nth-child(6) { transition-delay: 0.3s; }

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 54px; }
  .hero-visual { max-width: 720px; }
  .hero { padding-top: 72px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .shots { grid-template-columns: repeat(2, 1fr); }
  .download-card { grid-template-columns: 1fr; }
  .install-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}

@media (max-width: 760px) {
  .container { width: calc(100% - 32px); }
  .nav-inner { height: 64px; gap: 14px; }
  .brand-tag { display: none; }
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(10, 14, 22, 0.98);
    box-shadow: 0 24px 50px rgba(0, 0, 0, 0.5);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; border-radius: 9px; }
  .nav-links a:hover { background: rgba(255, 255, 255, 0.05); }
  .nav-actions .btn { display: none; }
  .hero { padding: 56px 0 42px; }
  .hero h1 { font-size: clamp(42px, 12vw, 64px); }
  .lead { max-width: 100%; font-size: 15px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .float-chip { display: none; }
  .app-icon-float { width: 86px; height: 86px; border-radius: 20px; right: -6px; bottom: -18px; }
  .stat-strip { grid-template-columns: repeat(2, 1fr); margin-top: 50px; }
  .stat-strip > div { padding: 18px; }
  .section { padding: 72px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .shots { grid-template-columns: 1fr; gap: 14px; }
  .shot-caption { padding: 34px 16px 14px; }
  .flow-grid { grid-template-columns: 1fr; }
  .download-section { padding: 20px 0 76px; }
  .download-card { padding: 26px 22px; border-radius: 20px; }
  .privacy-card { flex-direction: column; align-items: flex-start; padding: 24px; }
  .privacy-card .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
  .legal { padding: 28px 22px; border-radius: 18px; }
  .legal-page { padding: 40px 0 64px; }
  .lightbox { padding: 16px; }
}

@media (max-width: 430px) {
  .meta-row { font-size: 11.5px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
  .stat-strip strong { font-size: 23px; }
  .shots { grid-template-columns: 1fr; }
  .shot-caption em { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}