:root {
  --bg: #ffffff;
  --surface: #f6f7fb;
  --text: #111314;
  --subtext: #5f6b76;
  --accent: #007aff;
  --accent-2: #6e7aff;
  --border: #e7e8ee;
  --shadow: 0 10px 30px rgba(17, 19, 20, 0.08);
  --radius: 16px;
  --space: 16px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: #f5f5f7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container { max-width: 900px; margin: 0 auto; padding: 0 20px; }
.app-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.center { width: 100%; max-width: 1298px; }
.cards { 
    display: grid; 
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
    align-items: stretch;
}
.card { background: #fff; border-radius: 24px; box-shadow: var(--shadow); border: 1px solid var(--border); padding: 24px; }
.card-info { display: grid; gap: 12px; text-align: center; }
.card-info .actions { justify-content: center; }
.card-gallery { padding: 0; overflow: hidden; }
.card-desc { display: grid; gap: 10px; }
.desc-title { margin: 0 0 20px 0; font-size: clamp(20px, 2.4vw, 24px); }
.desc-content { color: var(--subtext); line-height: 1.7; white-space: normal; }

.title { font-size: clamp(28px, 4vw, 44px); margin: 0 0 12px; letter-spacing: -0.5px; }
.subtitle { font-size: clamp(16px, 2.2vw, 20px); color: var(--subtext); margin: 0 0 18px; }
.meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; justify-content: center; }
.pill { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; color: var(--subtext); }
.actions { display: flex; gap: 12px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 12px; padding: 12px 18px; border: 1px solid var(--border); background: #fff; color: var(--text); cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s; box-shadow: var(--shadow); }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(180deg, #0a84ff, #007aff); color: #fff; border: none; }
.btn-primary:hover { box-shadow: 0 12px 32px rgba(10,132,255,.35); }
.btn-ghost { background: transparent; }


.carousel { position: relative; border-radius: var(--radius); overflow: hidden; background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); }
.carousel-track { display: flex; transition: transform .6s cubic-bezier(.2,.8,.2,1); }
.slide { min-width: 100%; position: relative; aspect-ratio: 16/9; background: #eaeef7; }
.slide img { width: 100%; height: 100%; object-fit: fill; display: block; }
.carousel-controls { position: absolute; inset: auto 12px 12px auto; display: flex; gap: 8px; }
.ctrl { border: 1px solid var(--border); background: rgba(255,255,255,.85); backdrop-filter: blur(10px); width: 36px; height: 36px; border-radius: 50%; cursor: pointer; display: grid; place-items: center; }
.ctrl:hover { background: #fff; }
.dots { position: absolute; inset: auto 0 10px 0; display: flex; justify-content: center; gap: 6px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #c9ced9; }
.dot.active { background: var(--accent); }

.site-footer { border-top: 1px solid var(--border); padding: 28px 0; color: var(--subtext); text-align: center; margin-top: 40px; }
.footer-text { margin: 6px 0; font-size: 14px; }

@media (max-width: 900px) {
  .cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header .container { height: 56px; }
  .hero .container { padding: 40px 20px; }
  .actions { flex-wrap: wrap; }
  .carousel-controls { inset: auto 8px 8px auto; }
}

/* 深色模式支持 - 系统偏好 */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #1c1c1e;
    --surface: #2c2c2e;
    --text: #f5f5f7;
    --subtext: #98989d;
    --border: #3a3a3c;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }
  html:not([data-theme="light"]) body { background: #000; color: var(--text); }
  html:not([data-theme="light"]) .card { 
    background: rgba(44, 44, 46, 0.8) !important;
    border-color: rgba(255,255,255,0.1) !important;
  }
  html:not([data-theme="light"]) .pill { background: var(--surface); border-color: var(--border); color: var(--subtext); }
  html:not([data-theme="light"]) .btn { background: var(--surface); color: var(--text); border-color: var(--border); }
  html:not([data-theme="light"]) .btn-primary { background: linear-gradient(180deg, #0a84ff, #007aff); color: #fff; }
  html:not([data-theme="light"]) .carousel { background: var(--surface); border-color: var(--border); }
  html:not([data-theme="light"]) .ctrl { background: rgba(44, 44, 46, 0.85); border-color: var(--border); color: var(--text); }
  html:not([data-theme="light"]) .ctrl:hover { background: var(--surface); }
  html:not([data-theme="light"]) .dot { background: #48484a; }
  html:not([data-theme="light"]) .site-footer { border-color: var(--border); }
}

/* 深色模式支持 - 手动切换 */
[data-theme="dark"] {
  --bg: #1c1c1e;
  --surface: #2c2c2e;
  --text: #f5f5f7;
  --subtext: #98989d;
  --border: #3a3a3c;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}
[data-theme="dark"] body { background: #000; color: var(--text); }
[data-theme="dark"] .card { 
  background: rgba(44, 44, 46, 0.8) !important;
  border-color: rgba(255,255,255,0.1) !important;
}
[data-theme="dark"] .pill { background: var(--surface); border-color: var(--border); color: var(--subtext); }
[data-theme="dark"] .btn { background: var(--surface); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .btn-primary { background: linear-gradient(180deg, #0a84ff, #007aff); color: #fff; }
[data-theme="dark"] .carousel { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .ctrl { background: rgba(44, 44, 46, 0.85); border-color: var(--border); color: var(--text); }
[data-theme="dark"] .ctrl:hover { background: var(--surface); }
[data-theme="dark"] .dot { background: #48484a; }
[data-theme="dark"] .site-footer { border-color: var(--border); }