:root {
  --primary: #007aff;
  --primary-soft: #e8f3ff;
  --success: #34c759;
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1c1c1e;
  --text-secondary: #6c6c70;
  --text-tertiary: #aeaeb2;
  --divider: #e5e5ea;
  --radius: 16px;
  --shadow: 0 2px 12px rgba(28, 28, 30, 0.06);
  --max: 720px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 480px at 10% -10%, #d9ecff 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #e6f9ec 0%, transparent 50%),
    var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(245, 245, 247, 0.85);
  border-bottom: 1px solid rgba(229, 229, 234, 0.8);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  object-fit: cover;
  display: block;
  box-shadow: 0 4px 12px rgba(0, 122, 255, 0.28);
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 999px;
  text-decoration: none;
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
  background: var(--primary-soft);
  text-decoration: none;
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--divider);
  border-radius: 999px;
  overflow: hidden;
  background: var(--card);
}

.lang-toggle button {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 10px;
  cursor: pointer;
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--primary);
  color: #fff;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px 64px;
}

.hero {
  margin-bottom: 28px;
}

.hero-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.hero p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 38em;
}

.meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  color: var(--text-tertiary);
  font-size: 13px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(229, 229, 234, 0.7);
  padding: 20px 22px;
  margin-bottom: 14px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--primary);
}

.card p,
.card li {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

.card ul {
  margin: 0;
  padding-left: 1.15em;
}

.card li + li {
  margin-top: 0.35em;
}

.callout {
  border-left: 3px solid var(--success);
  background: #e6f9ec;
  padding: 14px 16px;
  border-radius: 0 12px 12px 0;
  margin-bottom: 14px;
}

.callout strong {
  display: block;
  color: var(--text);
  margin-bottom: 4px;
}

.callout p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.home-grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 640px) {
  .home-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.home-card {
  display: block;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(229, 229, 234, 0.7);
  padding: 22px;
  color: inherit;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.home-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(28, 28, 30, 0.1);
  text-decoration: none;
}

.home-card h2 {
  margin: 0 0 8px;
  font-size: 1.15rem;
  color: var(--text);
}

.home-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.home-card .arrow {
  display: inline-block;
  margin-top: 14px;
  color: var(--primary);
  font-weight: 600;
  font-size: 14px;
}

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

.contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--divider);
}

.contact-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.contact-list span {
  color: var(--text-secondary);
  min-width: 10em;
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px 40px;
  color: var(--text-tertiary);
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

[data-lang-panel] {
  display: none;
}

[data-lang-panel].is-active {
  display: block;
}