:root {
  --bg: #0b0e14;
  --panel: #141924;
  --panel-2: #1a2130;
  --border: #262d3a;
  --text: #e8eaed;
  --muted: #9aa3b2;
  --accent: #e5b650;
  --accent-soft: #f0c66a;
  --danger: #ef6b6b;
  --radius: 10px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--bg); color: var(--text); font-family: 'Microsoft YaHei', system-ui, -apple-system, sans-serif; line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-soft); }

.topbar { display: flex; align-items: center; justify-content: space-between; padding: 14px 28px; border-bottom: 1px solid var(--border); background: rgba(11,14,20,.9); position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 700; font-size: 17px; letter-spacing: .2px; }
.brand span { color: var(--accent); }
.topbar nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.topbar nav a { color: var(--muted); }
.topbar nav a:hover { color: var(--text); }

.btn { display: inline-block; padding: 9px 18px; border-radius: 8px; font-size: 14px; font-weight: 600; cursor: pointer; border: 1px solid transparent; text-align: center; }
.btn-primary { background: var(--accent); color: #161206; }
.btn-primary:hover { background: var(--accent-soft); color: #161206; }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

.muted { color: var(--muted); }
.center { text-align: center; }

.hero { padding: 72px 28px 56px; text-align: center; }
.hero h1 { font-size: 42px; font-weight: 800; letter-spacing: .5px; margin-bottom: 16px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { font-size: 17px; color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.hero .cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.demo-wrap { max-width: 1080px; margin: 0 auto 70px; padding: 0 28px; }
.demo-frame { width: 100%; height: 460px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }

.features { max-width: 1080px; margin: 0 auto; padding: 0 28px 70px; }
.features h2, .pricing h2 { font-size: 28px; text-align: center; margin-bottom: 32px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.feature-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.feature-card h3 { font-size: 16px; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--muted); }

.pricing { max-width: 1080px; margin: 0 auto; padding: 0 28px 70px; }
.price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.price-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.price-card.hot { border-color: var(--accent); }
.price-card .plan { font-size: 15px; font-weight: 700; }
.price-card .price { font-size: 30px; font-weight: 800; }
.price-card .price small { font-size: 14px; font-weight: 400; color: var(--muted); }
.price-card ul { list-style: none; font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 6px; }
.price-card ul li::before { content: '✓ '; color: var(--accent); }
.price-card .btn { margin-top: auto; }

.footer { border-top: 1px solid var(--border); padding: 24px 28px; text-align: center; font-size: 13px; color: var(--muted); }

.auth-wrap { max-width: 400px; margin: 70px auto; padding: 0 20px; }
.auth-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; }
.auth-card h1 { font-size: 22px; margin-bottom: 20px; text-align: center; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field input { width: 100%; padding: 10px 12px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; }
.field input:focus { outline: none; border-color: var(--accent); }
.form-msg { font-size: 13px; min-height: 20px; margin-bottom: 10px; }
.form-msg.error { color: var(--danger); }
.auth-alt { text-align: center; font-size: 13px; color: var(--muted); margin-top: 16px; }

.app-wrap { max-width: 1080px; margin: 0 auto; padding: 30px 28px 60px; }
.app-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.app-head h1 { font-size: 24px; }
.usage-note { font-size: 13px; color: var(--muted); background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 8px 14px; }
.usage-note b { color: var(--accent); }
.artifact-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.artifact-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 8px; }
.artifact-card h3 { font-size: 15px; }
.artifact-card .meta { font-size: 12px; color: var(--muted); }
.artifact-card .actions { display: flex; gap: 10px; margin-top: auto; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty-state h3 { color: var(--text); margin-bottom: 8px; }

.new-wrap { max-width: 760px; margin: 0 auto; padding: 30px 28px 60px; }
.new-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.new-card h1 { font-size: 22px; margin-bottom: 6px; }
.new-card .sub { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.field textarea { width: 100%; padding: 12px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; min-height: 110px; resize: vertical; font-family: inherit; }
.field textarea:focus { outline: none; border-color: var(--accent); }
.field select { width: 100%; padding: 10px 12px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; }
.gen-status { margin-top: 16px; font-size: 14px; min-height: 24px; }
.gen-status .spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -2px; margin-right: 8px; }
@keyframes spin { to { transform: rotate(360deg); } }
.suggest { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.suggest button { background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); border-radius: 16px; padding: 5px 12px; font-size: 12px; cursor: pointer; }
.suggest button:hover { color: var(--accent); border-color: var(--accent); }

.viewer { background: var(--bg); }
.viewer-main { padding: 24px 28px 40px; }
.viewer-meta { margin-bottom: 16px; }
.viewer-meta h1 { font-size: 20px; margin-bottom: 4px; }
.artifact-frame { width: 100%; height: calc(100vh - 150px); min-height: 520px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }

/* ============================================================
   移动端适配（桌面端样式不变，仅按断点覆盖）
   ≤768px：平板 / 大屏手机；≤480px：小屏手机
   ============================================================ */
@media (max-width: 768px) {
  .topbar { padding: 12px 16px; }
  .topbar nav { gap: 12px; font-size: 13px; }
  .btn-sm { padding: 5px 10px; font-size: 12px; }
  .hero { padding: 44px 16px 40px; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 15px; }
  .demo-wrap { padding: 0 16px; margin-bottom: 44px; }
  .demo-frame { height: 330px; }
  .features { padding: 0 16px 44px; }
  .pricing { padding: 0 16px 44px; }
  .app-wrap { padding: 24px 16px 44px; }
  .new-wrap { padding: 24px 16px 44px; }
  .new-card { padding: 18px; }
  .auth-wrap { margin: 44px auto; }
  .lookup-wrap { padding: 32px 12px 32px; }
  .viewer-main { padding: 16px; }
  .viewer-meta h1 { font-size: 18px; }
  .footer { padding: 20px 16px; }
  /* iOS 聚焦自动放大：输入控件字号不小于 16px */
  .field input, .field textarea, .field select { font-size: 16px; }
  .artifact-frame { height: calc(100vh - 130px); min-height: 460px; }
}

@media (max-width: 480px) {
  .topbar { flex-wrap: wrap; gap: 6px; }
  .brand { font-size: 15px; }
  .topbar nav { width: 100%; justify-content: space-between; gap: 8px; }
  .hero { padding: 36px 16px 32px; }
  .hero h1 { font-size: 25px; }
  .hero .cta-row .btn { flex: 1 1 100%; }
  .demo-frame { height: 280px; }
  .feature-grid, .price-grid, .artifact-grid { grid-template-columns: 1fr; }
  .new-card h1 { font-size: 20px; }
  .suggest button { padding: 8px 14px; font-size: 13px; }
  .btn:not(.btn-sm) { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .code-line { font-size: 12px; }
  .code-value { font-size: 16px; letter-spacing: 2px; }
  .log-list { font-size: 11px; }
}