/* ZingTalk Site — 设计 Token 与 zing-ui / zing-talk Brand.swift 对齐 */
:root {
  --zing-blue: #2b6bff;
  --zing-purple: #7b5cff;
  --zing-assist-blue: #7cc5ff;
  --zing-assist-purple: #d490ff;
  --zing-success: #36b989;
  --zing-warning: #d9a637;
  --zing-danger: #d96374;

  --zing-gradient: linear-gradient(135deg, var(--zing-blue) 0%, var(--zing-purple) 100%);

  --bg: #f6f8fc;
  --bg-elevated: #ffffff;
  --ink: #0d1326;
  --ink-secondary: #5b6270;
  --border: rgba(43, 107, 255, 0.12);
  --shadow: 0 18px 40px -24px rgba(13, 19, 38, 0.28);

  --radius-card: 17px;
  --radius-button: 22px;
  --maxw: 1120px;
}

:root[data-theme='dark'] {
  --bg: #0d1326;
  --bg-elevated: #141a2e;
  --ink: #eef0f4;
  --ink-secondary: #a3aab8;
  --border: rgba(124, 197, 255, 0.14);
  --shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0d1326;
    --bg-elevated: #141a2e;
    --ink: #eef0f4;
    --ink-secondary: #a3aab8;
    --border: rgba(124, 197, 255, 0.14);
    --shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.6);
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei',
    'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

:root[data-theme='dark'] a:hover {
  color: var(--zing-assist-blue);
}

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.narrow {
  max-width: 760px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--zing-gradient);
  color: #fff;
  font-size: 15px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav a {
  font-size: 15px;
  color: var(--ink-secondary);
}

.nav a:hover {
  color: var(--ink);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-elevated);
  color: var(--ink);
  font-size: 18px;
  cursor: pointer;
}

.theme-toggle {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-elevated);
  color: var(--ink);
  width: 40px;
  height: 40px;
  cursor: pointer;
  font-size: 15px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 0;
  border-radius: var(--radius-button);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--zing-gradient);
  color: #fff;
  box-shadow: 0 10px 24px -14px var(--zing-purple);
}

.btn-ghost {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--ink);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 80px;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  inset: -30% 0 auto 0;
  height: 520px;
  background: radial-gradient(60% 60% at 50% 40%, rgba(123, 92, 255, 0.22), transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
}

.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--ink-secondary);
  font-size: 13px;
}

.hero h1 {
  margin: 24px 0 0;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.hero h1 .grad {
  background: var(--zing-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lead {
  margin: 20px auto 0;
  max-width: 640px;
  font-size: 17px;
  color: var(--ink-secondary);
}

.hero .btn-row {
  justify-content: center;
  margin-top: 32px;
}

.hero-meta {
  margin-top: 26px;
  font-size: 14px;
  color: var(--ink-secondary);
}

/* ---------- Sections ---------- */
.section {
  padding: 72px 0;
}

.section-alt {
  background: color-mix(in srgb, var(--bg-elevated) 55%, var(--bg));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 680px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 12px 0 0;
  color: var(--ink-secondary);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 14px 0 8px;
  font-size: 17px;
}

.card p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 15px;
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--zing-gradient);
  color: #fff;
  font-size: 18px;
}

/* ---------- Steps ---------- */
.steps {
  counter-reset: step;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.step {
  position: relative;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-elevated);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--zing-gradient);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.step h3 {
  margin: 12px 0 6px;
  font-size: 16px;
}

.step p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-secondary);
}

/* ---------- Tags / list ---------- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  font-size: 14px;
  color: var(--ink-secondary);
}

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

.check-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
  color: var(--ink-secondary);
  font-size: 15px;
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--zing-success);
  font-weight: 700;
}

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-elevated);
  padding: 16px 20px;
  margin-bottom: 12px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
}

.faq details p {
  margin: 12px 0 0;
  color: var(--ink-secondary);
  font-size: 15px;
}

/* ---------- CTA ---------- */
.cta {
  padding: 64px 0;
  text-align: center;
}

.cta-box {
  padding: 44px 28px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--zing-gradient);
  color: #fff;
}

.cta-box h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -0.02em;
}

.cta-box p {
  margin: 12px auto 0;
  max-width: 560px;
  opacity: 0.92;
}

.cta-box .btn {
  margin-top: 26px;
  background: #fff;
  color: var(--zing-blue);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--ink-secondary);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

/* ---------- Legal / support page ---------- */
.doc {
  padding: 56px 0 72px;
}

.doc h1 {
  margin: 0;
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: -0.02em;
}

.doc .updated {
  margin: 10px 0 0;
  color: var(--ink-secondary);
  font-size: 14px;
}

.doc section {
  margin-top: 34px;
  scroll-margin-top: 84px;
}

.doc h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.doc h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.doc p {
  margin: 0;
  color: var(--ink-secondary);
}

.doc .card {
  margin-top: 44px;
}

.doc .card > section:first-of-type {
  margin-top: 18px;
}

.breadcrumb {
  padding-top: 24px;
  font-size: 14px;
  color: var(--ink-secondary);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3,
  .grid-2,
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 16px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .grid-3,
  .grid-2,
  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding: 64px 0 56px;
  }

  .section {
    padding: 56px 0;
  }

  .header-inner {
    height: 60px;
  }
}