/* 天乙官网样式。
 *
 * 令牌体系与 data-theme 切换沿用 aicofi-web 的约定，便于同一套工具链维护；
 * 配色改用天乙 App 的紫金暗色识别（见 app/lib/theme.dart），暗色为默认——
 * 玄学产品的气质在浅色下会失掉大半。
 */

:root {
  color-scheme: dark;

  --ink: #e5e7eb;
  --ink-strong: #ffffff;
  --muted: #8891a6;
  --bg: #1a1c24;
  --surface: #252836;
  --surface-2: #2f3242;
  --line: rgba(226, 232, 240, 0.1);

  --primary: #8b5cf6;
  --primary-deep: #6b4dff;
  --gold: #f5c88a;
  --gold-deep: #cc8a4b;

  --page-bg:
    radial-gradient(circle at 78% -4%, rgba(139, 92, 246, 0.26), transparent 42%),
    radial-gradient(circle at 12% 12%, rgba(245, 200, 138, 0.09), transparent 38%),
    linear-gradient(180deg, #1a1c24 0%, #20222e 55%, #1a1c24 100%);

  --shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
  --radius: 18px;

  --text-hero: clamp(2.3rem, 1.1rem + 4.6vw, 4.4rem);
  --text-section: clamp(1.5rem, 1.1rem + 1.4vw, 2.2rem);
  --text-body: clamp(1rem, 0.96rem + 0.2vw, 1.08rem);
  --space-section: clamp(3.5rem, 2.4rem + 4vw, 7rem);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="light"] {
  color-scheme: light;
  --ink: #1f2430;
  --ink-strong: #0b0d14;
  --muted: #5d6477;
  --bg: #fbfaff;
  --surface: #ffffff;
  --surface-2: #f4f2fb;
  --line: rgba(15, 23, 42, 0.1);
  --page-bg:
    radial-gradient(circle at 78% -4%, rgba(139, 92, 246, 0.14), transparent 40%),
    linear-gradient(180deg, #ffffff 0%, #faf8ff 60%, #ffffff 100%);
  --shadow: 0 22px 60px rgba(46, 33, 92, 0.12);
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  background-image: var(--page-bg);
  background-attachment: fixed;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: var(--text-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink-strong);
}

.wrap {
  width: min(1080px, calc(100% - 2.5rem));
  margin-inline: auto;
}

/* ---------- 头部 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 62px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 650;
  font-size: 1.05rem;
  color: var(--ink-strong);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.brand__mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--gold));
}

.site-nav {
  display: flex;
  gap: 1.4rem;
  font-size: 0.92rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--ink-strong);
}

/* ---------- 首屏 ---------- */

.hero {
  padding: clamp(3.5rem, 2rem + 7vw, 8rem) 0 var(--space-section);
}

.hero__eyebrow {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--gold);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  margin-bottom: 1.4rem;
}

.hero h1 {
  margin: 0 0 1.2rem;
  font-size: var(--text-hero);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink-strong);
  font-weight: 700;
  max-width: 20ch;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--gold), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  max-width: 46ch;
  color: var(--muted);
  font-size: clamp(1.02rem, 0.98rem + 0.4vw, 1.2rem);
}

.hero__note {
  margin-top: 2rem;
  font-size: 0.86rem;
  color: var(--muted);
}

/* ---------- 特性 ---------- */

section {
  padding-block: var(--space-section);
}

h2 {
  font-size: var(--text-section);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
  margin: 0 0 0.6rem;
}

.section__lede {
  color: var(--muted);
  max-width: 52ch;
  margin: 0 0 2.6rem;
}

.cards {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}

.card {
  padding: 1.6rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 220ms var(--ease-out), border-color 220ms var(--ease-out);
}

.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--primary) 45%, transparent);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--ink-strong);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.card__index {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold-deep);
  margin-bottom: 0.9rem;
}

/* ---------- 法律条款页 ---------- */

.legal {
  padding-block: clamp(2.5rem, 1.5rem + 4vw, 4.5rem) var(--space-section);
}

.legal__meta {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 2.4rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--line);
}

.legal h2 {
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.45rem);
  margin-top: 2.6rem;
}

.legal h3 {
  font-size: 1.02rem;
  color: var(--ink-strong);
  margin-top: 1.8rem;
  margin-bottom: 0.4rem;
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.9rem;
}

.legal thead th {
  text-align: left;
  color: var(--gold);
  font-weight: 600;
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.7rem 0.55rem 0;
}

.legal tbody td {
  vertical-align: top;
  padding: 0.6rem 0.7rem 0.6rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.legal tbody td:first-child {
  color: var(--ink);
  white-space: nowrap;
}

/* 宽表在窄屏自行横向滚动，页面本身绝不横向滚动 */
.scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.callout {
  margin: 1.6rem 0;
  padding: 1.1rem 1.3rem;
  border-left: 3px solid var(--gold);
  background: var(--surface-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted);
  font-size: 0.92rem;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2.4rem 3rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.6rem;
  justify-content: space-between;
}

.site-footer nav {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--ink-strong);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}