/* 颜色、字体、圆角沿用仓库根目录 design-tokens.md。 */
:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #111317;
  --ink2: #62666e;
  --ink3: #a7aab0;
  --sep: #e7e8eb;
  --accent: #1b2742;
  --accent-soft: rgba(27, 39, 66, 0.08);
  --on-accent: #ffffff;
  --card-shadow: 0 1px 2px rgba(17, 19, 23, 0.04), 0 8px 24px rgba(17, 19, 23, 0.05);
  --card-edge: none;
  --phone-shadow: 0 24px 48px rgba(17, 19, 23, 0.16);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c0e;
    --card: #16171a;
    --ink: #f3f3f5;
    --ink2: #9a9da4;
    --ink3: #5e6168;
    --sep: #2a2b2f;
    --accent: #d8b878;
    --accent-soft: rgba(216, 184, 120, 0.14);
    --on-accent: #111317;
    --card-shadow: none;
    --card-edge: 0 0 0 0.5px rgba(255, 255, 255, 0.05);
    --phone-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
    "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶栏 */
.site-header {
  border-bottom: 0.5px solid var(--sep);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  font-size: 17px;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 15px;
}

.site-nav a {
  color: var(--ink2);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav .lang {
  padding: 4px 10px;
  border: 0.5px solid var(--sep);
  border-radius: 8px;
}

/* 首页 */
.hero {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 64px;
  align-items: center;
  padding: 80px 0 96px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: 48px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero .lede {
  margin: 0 0 32px;
  max-width: 30em;
  font-size: 19px;
  color: var(--ink2);
}

.download {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 50px;
  padding: 0 24px;
  border-radius: 12px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 17px;
  font-weight: 600;
}

.button:hover {
  text-decoration: none;
  opacity: 0.9;
}

.button[aria-disabled="true"] {
  background: var(--accent-soft);
  color: var(--ink2);
  cursor: default;
}

.button[aria-disabled="true"]:hover {
  opacity: 1;
}

.download .note {
  font-size: 15px;
  color: var(--ink2);
}

.phone {
  width: 100%;
  max-width: 320px;
  border-radius: 40px;
  box-shadow: var(--phone-shadow);
  outline: 0.5px solid var(--sep);
}

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 64px 0;
  border-top: 0.5px solid var(--sep);
}

.hero > *,
.feature > * {
  min-width: 0;
}

.feature.text-only {
  align-items: start;
}

.feature .phone {
  justify-self: center;
  max-width: 280px;
}

.feature h2,
.section h2 {
  margin: 0 0 12px;
  font-size: 28px;
  line-height: 1.25;
  font-weight: 700;
}

.feature p {
  margin: 0 0 16px;
  color: var(--ink2);
}

.points {
  margin: 0;
  padding: 0;
  list-style: none;
}

.points li {
  padding: 12px 0;
  border-top: 0.5px solid var(--sep);
}

.points li:first-child {
  border-top: none;
}

.points strong {
  display: block;
  font-weight: 600;
}

.points span {
  color: var(--ink2);
  font-size: 15px;
}

.section {
  padding: 64px 0;
  border-top: 0.5px solid var(--sep);
}

.section > p {
  margin: 0 0 24px;
  color: var(--ink2);
  max-width: 36em;
}

.group {
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--card-shadow), var(--card-edge);
  overflow: hidden;
}

.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.compare th,
.compare td {
  padding: 14px 20px;
  text-align: left;
  border-top: 0.5px solid var(--sep);
}

.compare thead th {
  border-top: none;
  color: var(--ink2);
  font-weight: 600;
}

.compare td + td,
.compare th + th {
  width: 28%;
}

/* 文档页（隐私政策、用户协议、支持） */
.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

.doc h1 {
  margin: 0 0 8px;
  font-size: 34px;
  line-height: 1.2;
  font-weight: 700;
}

.doc .meta {
  margin: 0 0 40px;
  font-size: 15px;
  color: var(--ink2);
}

.doc h2 {
  margin: 40px 0 12px;
  font-size: 22px;
  line-height: 1.3;
  font-weight: 600;
}

.doc h3 {
  margin: 24px 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.doc p,
.doc li {
  color: var(--ink);
}

.doc ul {
  padding-left: 1.25em;
}

.doc li + li {
  margin-top: 6px;
}

.doc .summary {
  padding: 20px 24px;
  margin: 0 0 8px;
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--card-shadow), var(--card-edge);
}

.doc .summary p {
  margin: 0;
}

.faq details {
  border-top: 0.5px solid var(--sep);
}

.faq details:first-child {
  border-top: none;
}

.faq summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  float: right;
  color: var(--ink3);
  font-weight: 400;
}

.faq details[open] summary::after {
  content: "−";
}

.faq details > div {
  padding: 0 20px 16px;
  color: var(--ink2);
}

.faq details > div p {
  margin: 0 0 8px;
  color: var(--ink2);
}

.contact {
  margin-top: 40px;
  padding: 24px;
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--card-shadow), var(--card-edge);
}

.contact h2 {
  margin-top: 0;
}

.contact p {
  margin: 0 0 8px;
}

/* 页脚 */
.site-footer {
  border-top: 0.5px solid var(--sep);
  font-size: 13px;
  color: var(--ink2);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  padding-bottom: 32px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.site-footer a {
  color: var(--ink2);
}

@media (max-width: 800px) {
  .site-nav {
    gap: 16px;
  }

  .site-nav .optional {
    display: none;
  }

  .hero,
  .feature {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero {
    padding: 48px 0 64px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero .phone {
    justify-self: center;
    max-width: 280px;
  }

  .feature .phone {
    order: 2;
  }

  .compare th,
  .compare td {
    padding: 12px;
  }

  .compare td + td,
  .compare th + th {
    width: auto;
  }

  .site-header .wrap,
  .wrap {
    padding: 0 16px;
  }

  .brand {
    flex-shrink: 0;
  }
}