/* saitis 官网占位页主题
 * 设计语言：黑白中性 + 单个强调色（与 iOS 一致 #3B5BDB / 暗色 #8AA4FF）
 * 主 CTA 深色实底白字（见 designs/2026-08-08-website-design.md §6.0）
 */

:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --border: #e6e6e6;
  --accent: #3b5bdb;
  --accent-fg: #ffffff;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0f;
    --fg: #f2f2f2;
    --muted: #9a9a9a;
    --border: #26262e;
    --accent: #8aa4ff;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- 顶栏 ---- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--fg);
}

.brand-icon {
  width: 28px;
  height: 28px;
  display: block;
}

.brand-name {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.lang-toggle {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 14px;
  cursor: pointer;
}

.lang-toggle:hover {
  border-color: var(--accent);
}

/* ---- Hero ---- */
.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px 96px;
}

.hero-icon {
  width: 96px;
  height: 96px;
  margin-bottom: 28px;
  border: 1px solid var(--border);
  border-radius: 20px;
}

.hero-title {
  font-family: var(--mono);
  font-size: 56px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 16px;
}

.hero-status {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 36px;
}

.hero-note {
  font-size: 13px;
  color: var(--muted);
  margin: 20px 0 0;
}

/* ---- CTA ---- */
.cta {
  display: inline-block;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  border-radius: 12px;
  padding: 14px 28px;
}

.cta-primary {
  background: var(--fg);
  color: var(--bg);
}

.cta-primary:hover {
  opacity: 0.88;
}

/* ---- 页脚 ---- */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 32px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .hero-title { font-size: 40px; }
  .site-header { padding: 16px 20px; }
  .hero { padding: 56px 20px 72px; }
}