/* ============================================================================
 *  DRheEheAM SSO · 基础样式
 * ========================================================================== */

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
}

/* ---------- 背景光晕 ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(60vw 60vw at 12% 8%, var(--primary-soft), transparent 62%),
    radial-gradient(52vw 52vw at 88% 82%, var(--accent-soft), transparent 62%),
    linear-gradient(var(--bg-veil), var(--bg-veil));
}

a { color: var(--primary); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: var(--primary-hover); }

h1, h2, h3, h4 {
  margin: 0;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  font-weight: 600;
}

p { margin: 0 0 1em; }

/* ============================================================================
 *  顶栏
 * ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  background: var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  font-size: var(--fs-md);
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  box-shadow: 0 4px 14px var(--primary-ring);
  flex: none;
}

.brand-sub {
  font-size: var(--fs-xs);
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.header-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: var(--fs-sm);
}

.header-nav a { color: var(--text-secondary); }
.header-nav a:hover { color: var(--primary); }

/* ---------- 主题切换 ---------- */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-strong);
  color: var(--text-secondary);
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 0;
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.theme-toggle:hover { color: var(--primary); border-color: var(--primary-ring); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-moon { display: none; }
[data-theme='dark'] .theme-toggle .icon-sun { display: none; }
[data-theme='dark'] .theme-toggle .icon-moon { display: block; }

/* ============================================================================
 *  容器
 * ========================================================================== */
.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main { flex: 1 0 auto; }

/* ============================================================================
 *  首屏
 * ========================================================================== */
.hero {
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.hero-badge .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.hero h1 {
  font-size: var(--fs-2xl);
  line-height: 1.08;
  margin-bottom: 1rem;
  letter-spacing: -0.035em;
}

.hero h1 .grad {
  background: linear-gradient(120deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 34em;
  margin: 0 auto 2.25rem;
  font-size: var(--fs-md);
  line-height: var(--lh-base);
  color: var(--text-secondary);
}

.hero-actions {
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================================
 *  按钮
 * ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: inherit;
  font-size: var(--fs-base);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
  will-change: transform;
}
.btn:active { transform: scale(0.975); }
.btn svg { width: 18px; height: 18px; flex: none; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 20px var(--primary-ring);
}
.btn-primary:hover {
  background: var(--primary-hover);
  color: #fff;
  box-shadow: 0 10px 28px var(--primary-ring);
}

.btn-ghost {
  background: var(--glass-bg);
  border-color: var(--glass-border);
  color: var(--text);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
}
.btn-ghost:hover {
  border-color: var(--primary-ring);
  color: var(--primary);
}

/* ============================================================================
 *  卡片
 * ========================================================================== */
.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow), var(--glass-inner);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  padding: 1.5rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.1rem;
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.feature {
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.feature:hover {
  transform: translateY(-3px);
  box-shadow: var(--glass-shadow-hover), var(--glass-inner);
  border-color: var(--primary-ring);
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  background: var(--primary-soft);
  color: var(--primary);
  margin-bottom: 1rem;
}
.feature-icon svg { width: 20px; height: 20px; }

.feature h3 {
  font-size: var(--fs-base);
  font-weight: 600;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}
.feature p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: var(--lh-snug);
  color: var(--text-secondary);
}

/* ============================================================================
 *  文档页（隐私政策 / 服务条款）
 * ========================================================================== */
.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) 0 5rem;
}

.doc-head { margin-bottom: 2.5rem; }
.doc-head h1 {
  font-size: var(--fs-xl);
  margin-bottom: 0.6rem;
  letter-spacing: -0.03em;
}
.doc-meta {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.doc h2 {
  font-size: var(--fs-lg);
  margin: 2.25rem 0 0.85rem;
  letter-spacing: -0.02em;
  scroll-margin-top: 5rem;
}
.doc h2:first-of-type { margin-top: 0; }
.doc h3 {
  font-size: var(--fs-md);
  margin: 1.5rem 0 0.55rem;
  color: var(--text);
}
.doc p, .doc li {
  color: var(--text-secondary);
  line-height: var(--lh-base);
}
.doc p { margin: 0 0 1rem; }
.doc ul, .doc ol { margin: 0 0 1.15rem; padding-left: 1.35rem; }
.doc li { margin-bottom: 0.45rem; }
.doc strong { color: var(--text); font-weight: 600; }

.doc a { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.35rem;
  font-size: var(--fs-sm);
}
.doc-table th, .doc-table td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--glass-border);
  color: var(--text-secondary);
  vertical-align: top;
}
.doc-table th {
  color: var(--text);
  font-weight: 600;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.note {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.9rem 1.1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 0 0 1.35rem;
}
.note p:last-child { margin-bottom: 0; }

/* ============================================================================
 *  页脚
 * ========================================================================== */
.site-footer {
  flex: none;
  border-top: 1px solid var(--glass-border);
  padding: 2rem 0 2.5rem;
  font-size: var(--fs-sm);
  color: var(--text-muted);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.footer-links { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.footer-links a { color: var(--text-secondary); }

/* ============================================================================
 *  占位页
 * ========================================================================== */
.placeholder {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 1.5rem;
}
.placeholder h1 { font-size: var(--fs-xl); margin-bottom: 0.75rem; }
.placeholder p { color: var(--text-secondary); margin-bottom: 1.75rem; }

@media (max-width: 640px) {
  .header-inner { padding: 0.7rem 1.1rem; }
  .header-nav { gap: 0.9rem; }
  .brand-sub { display: none; }
  .container { padding: 0 1.1rem; }
  .hero-actions .btn { flex: 1 1 100%; }
}