/* AI News — 独立站样式 */
:root {
  --bg: #f6f6f7;
  --surface: #ffffff;
  --surface-soft: #f2f2f5;
  --ink: #1d1d1f;
  --ink-soft: rgba(29,29,31,.74);
  --ink-muted: rgba(29,29,31,.52);
  --border: rgba(0,0,0,.08);
  --border-strong: rgba(0,0,0,.14);
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 6px 24px rgba(0,0,0,.06);
  --shadow-lg: 0 24px 80px rgba(0,0,0,.22);
  --accent: #ff6100;
  --accent-soft: rgba(255,97,0,.10);
  --github: #2ea043;
  --paper: #c99412;
  --company: #0096b8;
  --news: #ff6100;
  --oss: #7b2ff7;
  --hot: #e63946;
  --t1: #0a7d4f;
  --t1-soft: rgba(10,125,79,.10);
  --t2: #5b5bd6;
  --t2-soft: rgba(91,91,214,.10);
  --radius: 12px;
  --radius-lg: 18px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-soft: #1f252d;
  --ink: #e6edf3;
  --ink-soft: rgba(230,237,243,.76);
  --ink-muted: rgba(230,237,243,.52);
  --border: rgba(255,255,255,.09);
  --border-strong: rgba(255,255,255,.18);
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 24px rgba(0,0,0,.25);
  --shadow-lg: 0 24px 80px rgba(0,0,0,.6);
  --accent-soft: rgba(255,97,0,.16);
  --t1: #3fb984;
  --t1-soft: rgba(63,185,132,.14);
  --t2: #8b8bf0;
  --t2-soft: rgba(139,139,240,.15);
  color-scheme: dark;
}

* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:var(--font); background:var(--bg); color:var(--ink); line-height:1.5; transition:background .3s, color .3s; }
body.modal-open { overflow:hidden; }
a { color:inherit; }
[hidden] { display:none !important; }
:focus-visible { outline:2px solid var(--accent); outline-offset:2px; }

/* ── Header ── */
.site-header {
  position:sticky; top:0; z-index:50;
  background:color-mix(in srgb, var(--surface) 86%, transparent);
  border-bottom:1px solid var(--border);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
}
.site-header-inner { max-width:var(--maxw); margin:0 auto; padding:0 24px; height:52px; display:flex; align-items:center; gap:20px; }
.logo { font-size:18px; font-weight:800; letter-spacing:1px; color:var(--ink); text-decoration:none; white-space:nowrap; }
.logo .accent { color:var(--accent); }
.nav-links { display:flex; gap:4px; }
.nav-links a { font-size:14px; font-weight:500; color:var(--ink-muted); text-decoration:none; padding:6px 14px; border-radius:8px; transition:all .2s; }
.nav-links a:hover, .nav-links a.active { color:var(--ink); background:var(--accent-soft); }
.header-spacer { flex:1; }
.theme-toggle { width:34px; height:34px; border:none; border-radius:50%; background:var(--surface-soft); cursor:pointer; font-size:16px; display:flex; align-items:center; justify-content:center; transition:transform .2s; }
.theme-toggle:hover { transform:scale(1.1); }
.header-date { font-size:13px; color:var(--ink-muted); white-space:nowrap; }

/* ── Hero ── */
.hero { max-width:var(--maxw); margin:0 auto; padding:40px 24px 24px; }
.hero-kicker { font-size:12px; font-weight:700; letter-spacing:1.5px; color:var(--accent); text-transform:uppercase; }
.hero h1 { font-size:30px; font-weight:700; letter-spacing:-.02em; margin-top:8px; }
.hero-date { font-size:15px; color:var(--ink-muted); margin-top:6px; }
.hero-desc { font-size:15px; color:var(--ink-soft); margin-top:10px; max-width:640px; line-height:1.65; }
.back-link { color:inherit; text-decoration:none; }

.content { max-width:var(--maxw); margin:0 auto; padding:0 24px 90px; }
.block { margin-bottom:40px; }
.block-title { font-size:18px; font-weight:700; margin-bottom:14px; display:flex; align-items:baseline; gap:10px; flex-wrap:wrap; }
.block-hint { font-size:12.5px; font-weight:400; color:var(--ink-muted); }

/* ── Badges ── */
.score-badge {
  font-family:var(--mono); font-size:11.5px; font-weight:700; line-height:1;
  padding:4px 7px; border-radius:7px; flex-shrink:0; white-space:nowrap;
}
.band-a { background:rgba(230,57,70,.12); color:var(--hot); }
.band-b { background:var(--accent-soft); color:var(--accent); }
.band-c { background:rgba(0,150,184,.12); color:var(--company); }
.band-d { background:var(--surface-soft); color:var(--ink-muted); }
.tier-badge { font-family:var(--mono); font-size:10.5px; font-weight:700; padding:2px 6px; border-radius:5px; letter-spacing:.3px; }
.tier-t1 { background:var(--t1-soft); color:var(--t1); }
.tier-t15, .tier-t2 { background:var(--t2-soft); color:var(--t2); }
.pick-badge { font-size:11px; font-weight:600; padding:2px 7px; border-radius:6px; background:var(--accent-soft); color:var(--accent); }

/* ── News card（热门 / 排行 / 弹窗列表共用）── */
.news-card {
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:14px 16px 15px; position:relative; cursor:zoom-in; min-width:0;
  display:flex; flex-direction:column; gap:7px;
  transition:box-shadow .22s, transform .22s, border-color .22s;
}
.news-card:hover { box-shadow:var(--shadow); transform:translateY(-2px); border-color:var(--border-strong); }
.news-card.hot::before {
  content:''; position:absolute; top:0; left:16px; right:16px; height:3px; border-radius:0 0 3px 3px; background:var(--hot);
}
.nc-meta { display:flex; align-items:center; gap:7px; font-size:12px; color:var(--ink-muted); min-height:20px; flex-wrap:wrap; }
.nc-source { font-weight:600; color:var(--ink-soft); }
.nc-section::before, .nc-time::before { content:'·'; margin-right:7px; color:var(--ink-muted); }
.nc-spacer { flex:1; }
.nc-title { font-size:15.5px; font-weight:650; line-height:1.5; }
.nc-title-link { text-decoration:none; color:var(--ink); cursor:pointer; }
.nc-title-link:hover { color:var(--accent); text-decoration:underline; text-underline-offset:3px; text-decoration-thickness:1px; }
.ext { font-size:.78em; margin-left:4px; color:var(--ink-muted); opacity:0; transition:opacity .15s; }
.nc-title-link:hover .ext, .news-card:focus-visible .ext { opacity:1; color:var(--accent); }
.nc-detail { font-size:13.5px; color:var(--ink-soft); line-height:1.65; display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden; }
.nc-related { font-size:11.5px; color:var(--oss); font-weight:600; }
.news-card.compact { cursor:pointer; }
.news-card.compact .nc-detail { -webkit-line-clamp:2; }

.hot-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:14px; }
.hot-grid .news-card { padding-top:17px; }

/* ── Section cards ── */
.sections-grid-wrap { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; align-items:start; }
.section-card {
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:16px 18px 10px; position:relative; overflow:hidden; cursor:zoom-in;
  transition:box-shadow .22s, border-color .22s;
}
.section-card:hover { box-shadow:var(--shadow); border-color:var(--border-strong); }
.section-card-accent { position:absolute; top:0; left:18px; right:18px; height:3px; border-radius:0 0 3px 3px; background:var(--sec-color, var(--accent)); }
.accent-github { --sec-color:var(--github); }
.accent-paper { --sec-color:var(--paper); }
.accent-company { --sec-color:var(--company); }
.accent-news { --sec-color:var(--news); }
.accent-oss { --sec-color:var(--oss); }
.accent-hot { --sec-color:var(--hot); }
.section-card-header { display:flex; align-items:center; gap:10px; margin:6px 0 8px; }
.section-card-icon { font-size:14px; width:20px; text-align:center; color:var(--sec-color); }
.section-card-title { font-size:15px; font-weight:650; flex:1; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.section-card-count { font-family:var(--mono); font-size:11px; padding:2px 8px; border-radius:10px; background:var(--surface-soft); color:var(--ink-muted); }
.section-card-expand { font-size:14px; color:var(--ink-muted); transition:color .2s, transform .2s; }
.section-card:hover .section-card-expand { color:var(--sec-color); transform:scale(1.15); }
.section-card-body { list-style:none; }
.section-item {
  display:flex; align-items:center; gap:10px; padding:8px 8px; margin:0 -8px;
  border-radius:8px; cursor:pointer; transition:background .15s;
}
.section-item + .section-item { border-top:1px solid var(--border); }
.section-item:hover { background:var(--surface-soft); }
.section-item-dot { width:5px; height:5px; border-radius:50%; flex-shrink:0; background:var(--sec-color); align-self:flex-start; margin-top:8px; }
.section-item-main { flex:1; min-width:0; display:flex; flex-direction:column; }
.section-item-text { font-size:13.5px; line-height:1.5; color:var(--ink); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.section-item-sub { font-size:11.5px; color:var(--ink-muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.section-item-link {
  flex-shrink:0; width:26px; height:26px; border-radius:7px; display:flex; align-items:center; justify-content:center;
  font-size:13px; text-decoration:none; color:var(--ink-muted); transition:all .15s;
}
.section-item-link:hover { background:var(--accent-soft); color:var(--accent); }
.section-item-more { text-align:center; font-size:12.5px; color:var(--ink-muted); padding:9px 0 4px; border-top:1px dashed var(--border); margin-top:4px; }
.section-card:hover .section-item-more { color:var(--sec-color); }

/* ── Events ── */
.event-list { display:flex; flex-direction:column; gap:8px; }
.event-item {
  display:flex; align-items:center; gap:12px; background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:12px 16px; transition:box-shadow .2s, border-color .2s;
}
.event-item[data-open-item] { cursor:zoom-in; }
.event-item[data-open-item]:hover { box-shadow:var(--shadow); border-color:var(--border-strong); }
.event-badge { font-size:11px; font-weight:700; padding:3px 10px; border-radius:12px; background:rgba(123,47,247,.12); color:var(--oss); flex-shrink:0; white-space:nowrap; }
.event-content { flex:1; min-width:0; }
.event-title { font-size:14.5px; font-weight:600; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.event-sources { display:flex; gap:6px; margin-top:6px; flex-wrap:wrap; }
.event-source-tag { font-size:11px; padding:2px 8px; border-radius:8px; background:var(--surface-soft); color:var(--ink-muted); text-decoration:none; }
a.event-source-tag:hover { background:var(--accent-soft); color:var(--accent); }

/* ── Hot page ── */
.rank-group-title { font-size:16px; font-weight:700; margin:28px 0 12px; padding-bottom:8px; border-bottom:1px solid var(--border); display:flex; align-items:baseline; gap:10px; }
.rank-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px; }

/* ── Modal（从卡片放大而来）── */
.modal-backdrop {
  position:fixed; inset:0; z-index:100; background:rgba(10,12,16,.42);
  backdrop-filter:blur(5px); -webkit-backdrop-filter:blur(5px);
  display:flex; align-items:center; justify-content:center; padding:24px;
}
.modal {
  background:var(--surface); border-radius:var(--radius-lg); width:100%; max-width:720px; max-height:min(86vh, 900px);
  display:flex; flex-direction:column; overflow:hidden; box-shadow:var(--shadow-lg);
  transform-origin:center center; will-change:transform;
}
.modal-header { display:flex; align-items:center; gap:10px; padding:14px 18px 14px 24px; border-bottom:1px solid var(--border); position:relative; }
.modal-header::after { content:''; position:absolute; bottom:-1px; left:24px; right:24px; height:2px; background:var(--sec-color, var(--accent)); }
.modal-titles { display:flex; align-items:center; gap:10px; flex:1; min-width:0; }
.modal-icon { font-size:15px; color:var(--sec-color, var(--accent)); }
.modal-kicker { font-size:13px; font-weight:600; color:var(--ink-soft); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.modal-close, .modal-back {
  width:32px; height:32px; border:none; border-radius:50%; flex-shrink:0;
  background:var(--surface-soft); font-size:14px; color:var(--ink-muted); cursor:pointer; transition:background .2s, color .2s;
}
.modal-back { margin-left:-8px; font-size:16px; }
.modal-close:hover, .modal-back:hover { background:var(--accent-soft); color:var(--ink); }
.modal-body { flex:1; overflow-y:auto; padding:20px 24px 24px; overscroll-behavior:contain; }
.modal-list { display:flex; flex-direction:column; gap:10px; }

/* 详情 */
.detail-title { font-size:21px; font-weight:700; line-height:1.45; letter-spacing:-.01em; margin-top:10px; }
.detail-title-link { text-decoration:none; color:var(--ink); }
.detail-title-link:hover { color:var(--accent); }
.detail-title-link .ext { opacity:1; }
.detail-original-title { font-size:13.5px; color:var(--ink-muted); margin-top:6px; line-height:1.55; }
.detail-summary { font-size:15.5px; line-height:1.8; color:var(--ink-soft); margin-top:14px; }
.detail-block { margin-top:18px; padding:14px 16px; border-radius:var(--radius); background:var(--surface-soft); }
.detail-label { font-size:12px; font-weight:700; color:var(--ink-muted); letter-spacing:.4px; margin-bottom:6px; }
.detail-excerpt { font-size:14px; line-height:1.75; color:var(--ink-soft); }
.detail-facts { display:grid; grid-template-columns:auto 1fr; gap:6px 16px; margin-top:16px; font-size:13.5px; }
.detail-facts dt { color:var(--ink-muted); }
.detail-facts dd { color:var(--ink-soft); word-break:break-word; }
.detail-tags { display:flex; gap:6px; flex-wrap:wrap; margin-top:14px; }
.tag { font-size:11.5px; padding:2px 9px; border-radius:10px; background:var(--surface-soft); color:var(--ink-muted); }
.detail-related { list-style:none; display:flex; flex-direction:column; gap:8px; }
.detail-related li { display:flex; gap:10px; align-items:baseline; font-size:13.5px; }
.related-link { color:var(--ink); text-decoration:none; flex:1; min-width:0; }
.related-link:hover { color:var(--accent); text-decoration:underline; }
.related-src { font-size:12px; color:var(--ink-muted); flex-shrink:0; }
.detail-actions { display:flex; gap:10px; flex-wrap:wrap; margin-top:22px; }
.btn {
  display:inline-flex; align-items:center; gap:4px; padding:9px 16px; border-radius:10px; font-size:14px; font-weight:600;
  font-family:var(--font); text-decoration:none; cursor:pointer; border:1px solid var(--border-strong);
  background:var(--surface); color:var(--ink); transition:all .15s;
}
.btn:hover { border-color:var(--accent); color:var(--accent); }
.btn-primary { background:var(--accent); border-color:var(--accent); color:#fff; }
.btn-primary:hover { color:#fff; filter:brightness(1.08); }
.detail-note { font-size:12.5px; color:var(--ink-muted); margin-top:18px; }

/* ── About / sources ── */
.about-content { max-width:760px; }
.about-section { margin-bottom:40px; }
.about-section h2 { font-size:20px; font-weight:700; margin-bottom:14px; }
.about-section p { font-size:15px; color:var(--ink-soft); line-height:1.7; margin-bottom:12px; }
.about-section ul { list-style:none; padding:0; }
.about-section li { font-size:14px; color:var(--ink-soft); padding:6px 0; border-bottom:1px solid var(--border); }
.about-section code { background:var(--surface-soft); padding:2px 6px; border-radius:4px; font-size:13px; font-family:var(--mono); }
.flow-diagram { display:flex; flex-direction:column; gap:8px; margin:20px 0; }
.flow-step { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:12px 18px; display:flex; align-items:center; gap:12px; font-size:14px; }
.flow-arrow { text-align:center; color:var(--ink-muted); font-size:18px; }
.source-table { width:100%; border-collapse:collapse; font-size:13.5px; }
.source-table th { text-align:left; font-size:12px; font-weight:600; color:var(--ink-muted); padding:6px 8px; border-bottom:1px solid var(--border-strong); }
.source-table td { padding:7px 8px; border-bottom:1px solid var(--border); color:var(--ink-soft); }
.source-table a { text-decoration:none; }
.source-table a:hover { color:var(--accent); }
.status-dot { display:inline-block; width:8px; height:8px; border-radius:50%; margin-right:6px; }
.status-ok { background:var(--github); }
.status-bad { background:var(--hot); }

/* ── History ── */
.history-list { display:flex; flex-direction:column; gap:8px; }
.history-item { display:flex; align-items:center; gap:16px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:14px 18px; text-decoration:none; color:inherit; transition:box-shadow .2s, transform .2s; }
.history-item:hover { box-shadow:var(--shadow); transform:translateY(-1px); }
.history-date { font-size:16px; font-weight:600; flex-shrink:0; min-width:100px; }
.history-meta { font-size:13px; color:var(--ink-muted); }
.history-arrow { margin-left:auto; font-size:18px; color:var(--ink-muted); }

/* ── Footer / empty ── */
.site-footer { border-top:1px solid var(--border); padding:24px; text-align:center; }
.site-footer-inner { max-width:var(--maxw); margin:0 auto; display:flex; align-items:center; justify-content:center; gap:20px; flex-wrap:wrap; }
.site-footer a { font-size:13px; color:var(--ink-muted); text-decoration:none; transition:color .2s; }
.site-footer a:hover { color:var(--ink); }
.site-footer .sep { color:var(--border-strong); }
.empty-state { text-align:center; padding:80px 20px; color:var(--ink-muted); }
.empty-state h2 { font-size:20px; margin-bottom:8px; color:var(--ink-soft); }

/* ── Responsive ── */
@media (max-width: 960px) {
  .hot-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .header-date { display:none; }
}
@media (max-width: 760px) {
  .hot-grid, .sections-grid-wrap, .rank-list { grid-template-columns:1fr; }
  .hero h1 { font-size:24px; }
  .nav-links a { padding:6px 10px; }
}
@media (max-width: 600px) {
  .site-header-inner { padding:0 16px; gap:10px; }
  .hero { padding:24px 16px 16px; }
  .content { padding:0 16px 60px; }
  .logo { font-size:16px; }
  .nav-links a { padding:6px 8px; font-size:13.5px; }
  /* 手机上弹窗贴底，像 sheet */
  .modal-backdrop { padding:0; align-items:flex-end; }
  .modal { max-height:92vh; border-radius:var(--radius-lg) var(--radius-lg) 0 0; }
  .modal-body { padding:16px 18px 28px; }
  .detail-title { font-size:19px; }
  .ext { opacity:1; }
}
@media (prefers-reduced-motion: reduce) {
  .news-card, .section-card, .history-item { transition:none; }
  .news-card:hover { transform:none; }
}