/* XTV桌面 官网
   深色 + 单一强调蓝。配色取自 app/lib/theme.dart：
   bg #05060A / 卡片 #0F1218 / 强调色 #3D9BFF（极速档焦点框同色） */

:root {
  color-scheme: dark;
  --bg: #05060a;
  --bg-2: #080a10;
  --card: #0f1218;
  --card-hi: #161b24;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.16);
  --text: #f2f4f8;
  --muted: #98a0ac;
  --dim: #6b7280;
  --accent: #3d9bff;
  --accent-ink: #061018;
  --ok: #30d158;
  --warn: #ff9f0a;
  --radius: 14px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", Roboto,
    Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  word-break: break-all;
}
h1, h2, h3 { letter-spacing: -0.3px; margin: 0; font-weight: 600; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.wrap { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 99;
}
.skip:focus { left: 0; }

/* ---------------------------------------------------------------- 顶部安全提示 */
.site-alert {
  background: rgba(255, 159, 10, 0.08);
  border-bottom: 1px solid rgba(255, 159, 10, 0.26);
}
.alert-inner {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 11px 0; font-size: 13px; line-height: 1.65;
}
.alert-tag {
  flex: none; font-size: 12px; font-weight: 600; color: #ffc061;
  background: rgba(255, 159, 10, 0.16); border: 1px solid rgba(255, 159, 10, 0.34);
  border-radius: 999px; padding: 1px 10px; margin-top: 1px; white-space: nowrap;
}
.alert-inner p { color: #d8c9ae; }

/* ---------------------------------------------------------------- 顶栏 */
.site-header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(5, 6, 10, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(12px);
}
.nav { height: 76px; display: flex; align-items: center; gap: 28px; }

.brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.brand img { border-radius: 8px; }
.brand-name { font-size: 19px; font-weight: 600; letter-spacing: -0.4px; }
.brand-ver {
  font-size: 11px; color: var(--dim); letter-spacing: 0.4px;
  border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px;
}

.nav-links { display: flex; align-items: center; gap: 22px; margin-right: auto; }
.nav-links a {
  font-size: 13.5px; color: var(--muted); padding: 6px 0;
  border-bottom: 1px solid transparent; transition: color 0.15s, border-color 0.15s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.on { color: var(--text); border-bottom-color: var(--accent); }
.nav-links a.ext::after {
  content: "↗"; font-size: 11px; margin-left: 4px; vertical-align: 1px; opacity: 0.65;
}

.nav-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.nav-toggle {
  display: none; width: 38px; height: 38px; border: 1px solid var(--line-2);
  border-radius: 10px; background: transparent; cursor: pointer; padding: 0;
  position: relative;
}
.nav-toggle span {
  position: absolute; left: 10px; right: 10px; height: 1.5px;
  background: var(--text); transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle span:first-child { top: 15px; }
.nav-toggle span:last-child { bottom: 15px; }
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3px) rotate(-45deg); }

/* ---------------------------------------------------------------- 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; font-size: 14.5px; font-weight: 500;
  border: 1px solid var(--line-2); color: var(--text); background: transparent;
  cursor: pointer; transition: background 0.15s, border-color 0.15s, transform 0.12s;
}
.btn:hover { background: rgba(255, 255, 255, 0.06); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent); color: var(--accent-ink); border-color: var(--accent);
  font-weight: 600;
}
.btn-primary:hover { background: #5aabff; border-color: #5aabff; }
.btn-sm { padding: 9px 16px; font-size: 13.5px; }
/* 会离开本站的按钮，尾巴上挂一个 ↗，别让人点了才发现 */
.btn.ext-link::after {
  content: "\2197"; font-size: 12px; margin-left: 7px; opacity: 0.72; line-height: 1;
}
.btn-block { width: 100%; }

/* ---------------------------------------------------------------- 首屏 */
.hero { padding: 64px 0 24px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; z-index: -1;
  width: 900px; height: 700px; right: -220px; top: -260px;
  background: radial-gradient(circle, rgba(61, 155, 255, 0.18), transparent 62%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; z-index: -1;
  width: 700px; height: 600px; left: -260px; top: 180px;
  background: radial-gradient(circle, rgba(123, 44, 240, 0.14), transparent 64%);
  pointer-events: none;
}
.hero-grid {
  display: grid; grid-template-columns: 0.92fr 1.08fr;
  gap: 48px; align-items: center;
}
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 5px 12px; margin-bottom: 22px;
  background: rgba(255, 255, 255, 0.03);
}
.pill .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 3px rgba(48, 209, 88, 0.16);
}
.hero h1 { font-size: 52px; line-height: 1.16; letter-spacing: -1.6px; }
.lead { color: var(--muted); margin-top: 18px; max-width: 46em; }
.hero .lead { font-size: 15.5px; }
.hero-cta { display: flex; gap: 12px; margin: 30px 0 24px; flex-wrap: wrap; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-row li {
  font-size: 12.5px; color: var(--dim);
  border: 1px solid var(--line); border-radius: 999px; padding: 3px 11px;
}
.hero-shot { position: relative; }
.hero-shot img {
  border-radius: 14px; border: 1px solid var(--line-2);
  box-shadow: 0 28px 60px -24px rgba(0, 0, 0, 0.9);
}
.shot-cap { font-size: 12px; color: var(--dim); margin-top: 12px; text-align: right; }

/* 首屏轮播：两张截图（一行 6 个 / 一行 5 个） */
.carousel {
  position: relative; border-radius: 14px; overflow: hidden;
  border: 1px solid var(--line-2); background: #07080c;
  box-shadow: 0 28px 60px -24px rgba(0, 0, 0, 0.9);
}
.car-track {
  display: flex; will-change: transform;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.car-slide { flex: 0 0 100%; margin: 0; }
.car-slide img { width: 100%; display: block; }
.car-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 36px; height: 36px; border-radius: 50%; padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.26); background: rgba(6, 8, 12, 0.55);
  color: #fff; font-size: 22px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0.5; transition: opacity 0.2s, background 0.2s;
  backdrop-filter: blur(6px);
}
.carousel:hover .car-nav, .carousel:focus-within .car-nav { opacity: 1; }
.car-nav:hover { background: rgba(6, 8, 12, 0.82); }
.car-prev { left: 12px; }
.car-next { right: 12px; }
.car-dots {
  position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%);
  display: flex; gap: 7px;
}
.car-dots button {
  width: 7px; height: 7px; padding: 0; border: 0; border-radius: 4px;
  background: rgba(255, 255, 255, 0.42); cursor: pointer;
  transition: width 0.25s, background 0.25s;
}
.car-dots button.on { width: 20px; background: #fff; }

/* ---------------------------------------------------------------- 段落 */
.section { padding: 74px 0; border-top: 1px solid var(--line); }
.section:first-of-type { border-top: 0; }
.eyebrow {
  font-size: 11.5px; letter-spacing: 2px; color: var(--accent);
  text-transform: uppercase; margin-bottom: 14px;
}
.section h2 { font-size: 30px; line-height: 1.3; letter-spacing: -0.8px; }
.section .lead { margin-top: 14px; }

.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 38px;
}
.stat {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; background: var(--card);
}
.stat-n { display: block; font-size: 26px; font-weight: 600; letter-spacing: -0.8px; }
.stat-l { display: block; font-size: 12.5px; color: var(--dim); margin-top: 4px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 34px; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 22px 24px; background: var(--card);
  transition: border-color 0.18s, background 0.18s;
}
.card:hover { border-color: var(--line-2); background: var(--card-hi); }
.card h3 { font-size: 16.5px; margin-bottom: 8px; }
.card p { font-size: 13.8px; color: var(--muted); line-height: 1.75; }

.note {
  margin-top: 22px; font-size: 13px; color: var(--dim);
  border-left: 2px solid var(--line-2); padding-left: 14px;
}
.note-tight { margin-top: 0; }

/* ---------------------------------------------------------------- 截图 */
.shot-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 34px; }
.shot-pair figure, .shot-wrap, .split-item { margin: 0; }
.shot-pair img, .shot-wrap img, .split-item img {
  border-radius: 12px; border: 1px solid var(--line);
}
.shot-pair figcaption { font-size: 12.5px; color: var(--dim); margin-top: 10px; }
.shot-wrap { margin-top: 30px; }

/* ---------------------------------------------------------------- 版本 */
.ver-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 34px; }
.ver-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; background: var(--card);
}
.ver-card-hi { border-color: rgba(61, 155, 255, 0.45); background: #0d1420; }
.ver-card header { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ver-card h3 { font-size: 19px; }
.ver-tag {
  font-size: 11.5px; color: var(--muted);
  border: 1px solid var(--line-2); border-radius: 999px; padding: 1px 9px;
}
.ver-tag-hi { color: var(--accent); border-color: rgba(61, 155, 255, 0.5); }
.ver-sub { font-size: 13px; color: var(--dim); margin-top: 6px; }
.ver-card dl { margin: 18px 0 0; }
.ver-card dl > div {
  display: flex; gap: 14px; justify-content: space-between;
  padding: 9px 0; border-top: 1px solid var(--line); font-size: 13.5px;
}
.ver-card dt { color: var(--dim); flex: none; }
.ver-card dd { margin: 0; text-align: right; }

/* ---------------------------------------------------------------- 步骤 */
.steps { display: grid; gap: 16px; margin-top: 34px; }
.steps li {
  display: flex; gap: 18px; align-items: flex-start;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; background: var(--card);
}
.step-n {
  flex: none; font-size: 13px; font-weight: 600; color: var(--accent);
  border: 1px solid rgba(61, 155, 255, 0.36); border-radius: 8px;
  padding: 3px 8px; letter-spacing: 0.5px;
}
.steps li h3 { font-size: 15.5px; margin-bottom: 5px; }
.steps li p { font-size: 13.6px; color: var(--muted); }
.steps-4 { grid-template-columns: 1fr 1fr; }
.steps-4 li { flex-direction: column; gap: 12px; }

.callout {
  margin-top: 24px; border: 1px solid rgba(48, 209, 88, 0.32);
  background: rgba(48, 209, 88, 0.06); border-radius: var(--radius);
  padding: 22px 24px;
}
.callout h3 { font-size: 16px; margin-bottom: 8px; color: #a6f0bd; }
.callout p { font-size: 13.6px; color: var(--muted); }

/* ---------------------------------------------------------------- 细节 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 34px; }
.split-item img { background: #000; }
.split-item figcaption { margin-top: 14px; }
.split-item h3 { font-size: 16px; margin-bottom: 6px; }
.split-item p { font-size: 13.6px; color: var(--muted); }

/* ---------------------------------------------------------------- 下载 */
.dl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 34px; }
.dl-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; background: var(--card);
}
.dl-card-hi { border-color: rgba(61, 155, 255, 0.45); background: #0d1420; }
.dl-card header { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.dl-card h3 { font-size: 18px; }
.badge {
  font-size: 11.5px; color: var(--muted); border: 1px solid var(--line-2);
  border-radius: 999px; padding: 1px 9px;
}
.badge-hi { color: var(--accent); border-color: rgba(61, 155, 255, 0.5); }
.dl-meta { font-size: 12.5px; color: var(--dim); margin-bottom: 18px; }
.dl-file { font-size: 12px; color: var(--dim); margin-top: 12px; }
.dl-file code { background: transparent; border: 0; padding: 0; }

.dl-foot {
  margin-top: 26px; display: grid; gap: 16px;
}
.dl-foot .note { margin-top: 0; }
.qr { display: flex; gap: 16px; align-items: center; }
.qr img { width: 92px; border-radius: 10px; border: 1px solid var(--line); }
.qr-t { font-size: 14px; font-weight: 500; }
.qr-s { font-size: 12.5px; color: var(--dim); max-width: 30em; margin-top: 2px; }

/* ---------------------------------------------------------------- 要求 */
.spec { margin-top: 30px; border-top: 1px solid var(--line); }
.spec-row {
  display: flex; gap: 20px; justify-content: space-between;
  padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 14px;
}
.spec-row span { color: var(--dim); flex: none; }
.spec-row strong { font-weight: 500; text-align: right; }

/* ---------------------------------------------------------------- FAQ */
.faq { margin-top: 30px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer; padding: 18px 34px 18px 0;
  font-size: 15.5px; position: relative; transition: color 0.15s;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent); }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 400; color: var(--dim); line-height: 1;
  transition: color 0.15s;
}
.faq details[open] summary::after { content: "−"; color: var(--accent); }
.faq details p {
  font-size: 13.8px; color: var(--muted); padding: 0 40px 18px 0; margin-top: -4px;
}
.faq details p + p { margin-top: -8px; }

/* ---------------------------------------------------------------- 日志 */
.timeline { margin-top: 34px; border-left: 1px solid var(--line); padding-left: 26px; }
.timeline li { position: relative; padding-bottom: 34px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: ""; position: absolute; left: -32px; top: 8px;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--card-hi); border: 1px solid var(--line-2);
}
.timeline li:first-child::before { background: var(--accent); border-color: var(--accent); }
.tl-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.tl-head h3 { font-size: 16.5px; }
.tl-head time { font-size: 12.5px; color: var(--dim); }
.tl-sub { font-size: 13px; color: var(--muted); margin: 4px 0 8px; }
.timeline ul { display: grid; gap: 5px; }
.timeline ul li {
  font-size: 13.4px; color: var(--muted); padding: 0 0 0 14px; position: relative;
}
.timeline ul li::before {
  content: ""; position: absolute; left: 2px; top: 10px;
  width: 4px; height: 4px; border-radius: 50%; background: var(--dim);
  border: 0;
}

/* ---------------------------------------------------------------- 页脚 */
.site-footer { border-top: 1px solid var(--line); padding: 46px 0 34px; background: var(--bg-2); }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.foot-line { font-size: 13px; color: var(--dim); margin-top: 10px; }
.foot-links { display: flex; gap: 22px; flex-wrap: wrap; }
.foot-links a { font-size: 13.5px; color: var(--muted); }
.foot-links a:hover { color: var(--text); }
.foot-bottom {
  display: flex; gap: 20px; flex-wrap: wrap;
  margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line);
  font-size: 12px; color: var(--dim);
}

/* ---------------------------------------------------------------- 适配 */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero h1 { font-size: 42px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .nav-links {
    position: absolute; left: 0; right: 0; top: 76px;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(5, 6, 10, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 6px 24px 16px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
  .nav-toggle { display: block; }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 78px; }
  .wrap { width: calc(100% - 36px); }
  .nav { height: 64px; gap: 12px; }
  .nav-links { top: 64px; }
  .brand-name { font-size: 17px; }
  .brand-ver { display: none; }
  .hero { padding: 40px 0 12px; }
  .hero h1 { font-size: 34px; letter-spacing: -1px; }
  .hero .lead { font-size: 14.5px; }
  .hero-cta .btn { flex: 1; }
  .section { padding: 52px 0; }
  .section h2 { font-size: 23px; }
  .eyebrow { margin-bottom: 10px; }
  .cards, .shot-pair, .ver-grid, .dl-grid, .split, .steps-4 { grid-template-columns: 1fr; }
  .spec-row { flex-direction: column; gap: 4px; }
  .spec-row strong { text-align: left; }
  .shot-cap { text-align: left; }
  .stats { gap: 10px; }
  .stat { padding: 14px 16px; }
  .stat-n { font-size: 21px; }
  .timeline { padding-left: 20px; }
  .timeline li::before { left: -26px; }
  .foot-bottom { gap: 8px; flex-direction: column; }
  .alert-inner { flex-direction: column; gap: 6px; }
  .car-nav { opacity: 1; width: 32px; height: 32px; font-size: 19px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}