/* 龙虾AI · site.css v2 — 清爽白 + 冷灰 slate（仿 yitb 风格）
   纯白底 / slate 文字 / 珊瑚红主色 / 靛蓝点缀 / 1200 宽 / 主内容+右侧 300 边栏 */

:root{
  --primary:#f04d5a; --primary-dark:#d93d4a; --primary-tint:#fef2f3;
  --accent:#6366f1; --accent-tint:#eef2ff;
  --bg:#ffffff; --bg-alt:#f8fafc; --surface:#ffffff;
  --text:#0f172a; --text-2:#475569; --text-muted:#94a3b8;
  --border:#e2e8f0; --border-light:#f1f5f9;
  --ok:#16a34a; --ok-tint:#dcfce7; --warn:#d97706; --warn-tint:#fef3c7;
  --radius:12px; --radius-sm:8px;
  --shadow-sm:0 1px 3px rgba(15,23,42,.06);
  --shadow-md:0 4px 14px rgba(15,23,42,.07);
  --maxw:1200px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SF Mono","Roboto Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{ margin:0; background:var(--bg); color:var(--text); font-family:var(--sans);
  font-size:16px; line-height:1.68; -webkit-font-smoothing:antialiased; font-feature-settings:"tnum"; }
img{ max-width:100%; height:auto; display:block; }
a{ color:var(--accent); text-decoration:none; }
a:hover{ color:var(--primary); }
h1,h2,h3,h4{ line-height:1.3; letter-spacing:-.01em; color:var(--text); }
.wrap{ width:100%; max-width:var(--maxw); margin:0 auto; padding:0 22px; }
.skip{ position:absolute; left:-999px; }
.skip:focus{ left:12px; top:12px; background:var(--text); color:#fff; padding:8px 14px; border-radius:8px; z-index:60; }
.eyebrow{ font-family:var(--mono); font-size:.7rem; letter-spacing:.16em; text-transform:uppercase; color:var(--primary); margin:0 0 .5rem; }
.muted{ color:var(--text-muted); }

/* ---------- topbar（极简浅色一行） ---------- */
.topbar{ background:var(--bg-alt); border-bottom:1px solid var(--border-light); font-size:.76rem; color:var(--text-muted); }
.topbar .wrap{ display:flex; gap:14px; align-items:center; justify-content:space-between; padding:6px 22px; }

/* ---------- header ---------- */
.site-header{ position:sticky; top:0; z-index:50; background:rgba(255,255,255,.9); backdrop-filter:saturate(160%) blur(10px); border-bottom:1px solid var(--border); }
.header-main{ display:flex; align-items:center; justify-content:space-between; gap:16px; padding:11px 22px; max-width:var(--maxw); margin:0 auto; }
.brand{ display:flex; align-items:center; gap:10px; color:var(--text); }
.brand:hover{ color:var(--text); }
.brand__mark{ font-size:1.55rem; line-height:1; }
.brand__name{ font-weight:800; font-size:1.22rem; letter-spacing:-.02em; }
.brand__name small{ display:block; font-family:var(--mono); font-weight:400; font-size:.52rem; letter-spacing:.16em; color:var(--text-muted); text-transform:uppercase; margin-top:2px; }
.nav{ display:flex; align-items:center; gap:1px; flex-wrap:wrap; }
.nav a{ color:var(--text-2); font-size:.9rem; padding:7px 11px; border-radius:8px; }
.nav a:hover{ background:var(--bg-alt); color:var(--text); }
.nav a[aria-current="page"]{ color:var(--primary); font-weight:700; }
.nav-toggle{ display:none; background:none; border:1px solid var(--border); border-radius:8px; width:42px; height:38px; cursor:pointer; }
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{ content:""; display:block; width:18px; height:2px; background:var(--text); margin:0 auto; position:relative; }
.nav-toggle span::before{ position:absolute; top:-6px; } .nav-toggle span::after{ position:absolute; top:6px; }

/* ---------- hero（居中 + 搜索） ---------- */
.hero{ background:var(--bg-alt); border-bottom:1px solid var(--border); }
.hero .wrap{ padding:46px 22px; }
.hero__inner{ max-width:none; margin:0; }
.hero h1{ font-size:clamp(1.8rem,4.4vw,2.85rem); margin:.3rem 0 .7rem; font-weight:850; }
.hero h1 em{ font-style:normal; color:var(--primary); }
.hero .lede{ font-size:1.08rem; color:var(--text-2); margin:0 0 1.4rem; }
.searchbar{ display:flex; max-width:460px; margin:0; box-shadow:var(--shadow-sm); border-radius:var(--radius-sm); }
.searchbar input{ flex:1; padding:12px 16px; border:1px solid var(--border); border-right:none; border-radius:var(--radius-sm) 0 0 var(--radius-sm); font-size:.95rem; outline:none; background:#fff; }
.searchbar input:focus{ border-color:var(--primary); }
.searchbar button{ padding:12px 22px; background:var(--primary); color:#fff; border:none; border-radius:0 var(--radius-sm) var(--radius-sm) 0; font-weight:700; cursor:pointer; font-size:.95rem; }
.searchbar button:hover{ background:var(--primary-dark); }
.hero__cta{ display:flex; gap:12px; flex-wrap:wrap; justify-content:flex-start; margin-top:18px; }
.hero__grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:46px; align-items:center; }
.hero__art{ margin:0; }
.hero__art img{ width:100%; height:auto; border-radius:18px; box-shadow:var(--shadow-md); display:block; }
@media(max-width:820px){
  .hero__grid{ grid-template-columns:1fr; gap:22px; }
  .hero__inner{ text-align:center; }
  .hero .lede{ margin-left:auto; margin-right:auto; max-width:42rem; }
  .searchbar{ margin:0 auto; }
  .hero__cta{ justify-content:center; }
  .hero__art{ order:-1; max-width:340px; margin:0 auto; }
}
.btn{ display:inline-flex; align-items:center; gap:8px; font-weight:700; font-size:.93rem; padding:11px 20px; border-radius:var(--radius-sm); border:1px solid transparent; cursor:pointer; }
.btn--primary{ background:var(--primary); color:#fff; } .btn--primary:hover{ background:var(--primary-dark); color:#fff; }
.btn--ghost{ background:#fff; color:var(--text); border-color:var(--border); } .btn--ghost:hover{ border-color:var(--primary); color:var(--primary); }
.statline{ display:flex; gap:26px; flex-wrap:wrap; justify-content:center; margin-top:30px; padding-top:22px; border-top:1px solid var(--border); }
.statline div{ font-size:.86rem; color:var(--text-2); }
.statline b{ display:block; font-size:1.35rem; color:var(--text); font-weight:800; letter-spacing:-.02em; }

/* ---------- 两栏布局 ---------- */
.layout{ max-width:var(--maxw); margin:0 auto; padding:34px 22px; display:grid; grid-template-columns:1fr 300px; gap:38px; align-items:start; }
.layout__main{ min-width:0; }

/* ---------- sections ---------- */
.section{ padding:34px 0; border-bottom:1px solid var(--border-light); }
.section:first-child{ padding-top:6px; }
.section-head{ display:flex; align-items:baseline; justify-content:space-between; gap:14px; margin-bottom:20px; }
.section-head h2{ font-size:1.4rem; margin:0; }
.section-head .more{ font-size:.86rem; font-weight:700; white-space:nowrap; }

/* cards */
.grid{ display:grid; gap:16px; }
.grid--3{ grid-template-columns:repeat(3,1fr); }
.grid--2{ grid-template-columns:repeat(2,1fr); }
.card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:18px; transition:.16s; }
.card:hover{ box-shadow:var(--shadow-md); border-color:#cbd5e1; transform:translateY(-2px); }
.card a{ color:inherit; } .card a:hover{ color:var(--primary); }
.card .kicker{ font-family:var(--mono); font-size:.64rem; letter-spacing:.1em; text-transform:uppercase; color:var(--primary); }
.card h3{ font-size:1.06rem; margin:.45rem 0 .5rem; }
.card p{ margin:0; color:var(--text-2); font-size:.92rem; }
.card .meta{ margin-top:11px; font-size:.78rem; color:var(--text-muted); font-family:var(--mono); }
.tag{ display:inline-block; font-size:.72rem; font-family:var(--mono); background:var(--accent-tint); color:var(--accent); padding:2px 8px; border-radius:6px; margin-right:6px; }
/* 带封面缩略图的卡片 */
.card--media{ padding:0; overflow:hidden; }
.card--media .card__media{ height:120px; display:flex; align-items:center; justify-content:center; background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 60%,#9b1c2a 100%); }
.card--media .card__media span{ font-size:2.7rem; filter:drop-shadow(0 3px 8px rgba(0,0,0,.22)); }
.card--media .card__body{ padding:15px 18px 18px; }

/* ranking table */
.rank{ width:100%; border-collapse:collapse; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); overflow:hidden; }
.rank th,.rank td{ padding:12px 14px; text-align:left; border-bottom:1px solid var(--border-light); font-size:.9rem; vertical-align:middle; }
.rank thead th{ background:var(--bg-alt); font-size:.72rem; font-family:var(--mono); letter-spacing:.06em; text-transform:uppercase; color:var(--text-2); }
.rank tbody tr:last-child td{ border-bottom:none; }
.rank tbody tr:hover{ background:var(--bg-alt); }
.rank .no{ font-family:var(--mono); font-weight:800; color:var(--primary); width:2.6rem; }
.rank .name{ font-weight:700; color:var(--text); }
.rank .score{ font-family:var(--mono); font-weight:800; }
.bar{ height:6px; background:var(--border-light); border-radius:4px; overflow:hidden; min-width:80px; }
.bar > i{ display:block; height:100%; background:linear-gradient(90deg,var(--accent),var(--primary)); }
.pill{ font-size:.7rem; font-family:var(--mono); padding:2px 9px; border-radius:20px; }
.pill--free{ background:var(--ok-tint); color:var(--ok); }
.pill--paid{ background:var(--warn-tint); color:var(--warn); }

/* news / list */
.list{ list-style:none; margin:0; padding:0; }
.list li{ display:flex; gap:14px; align-items:baseline; padding:12px 8px; border-bottom:1px solid var(--border-light); border-radius:6px; }
.list li:hover{ background:var(--bg-alt); }
.list time{ font-family:var(--mono); font-size:.76rem; color:var(--text-muted); white-space:nowrap; min-width:5.4rem; }
.list a{ color:var(--text); font-weight:600; } .list a:hover{ color:var(--primary); }

/* callouts */
.handson{ background:var(--primary-tint); border:1px solid #f9d5d8; border-left:4px solid var(--primary); border-radius:var(--radius-sm); padding:14px 16px; margin:22px 0; font-size:.92rem; color:var(--text-2); }
.handson b{ display:block; font-family:var(--mono); font-size:.72rem; letter-spacing:.06em; text-transform:uppercase; color:var(--primary-dark); margin-bottom:6px; }
.note{ background:var(--accent-tint); border:1px solid #dfe3ff; border-radius:var(--radius-sm); padding:12px 15px; margin:18px 0; font-size:.88rem; color:var(--text-2); }

/* chips */
.chips{ display:flex; flex-wrap:wrap; gap:10px; }
.chips a{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:9px 14px; font-size:.88rem; color:var(--text); font-weight:600; }
.chips a:hover{ border-color:var(--primary); color:var(--primary); }
.chips small{ font-family:var(--mono); color:var(--text-muted); font-weight:400; }

/* ---------- sidebar ---------- */
.sidebar{ display:flex; flex-direction:column; gap:18px; position:sticky; top:74px; }
.side-card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:16px 18px; }
.side-card h3{ font-size:.78rem; font-family:var(--mono); letter-spacing:.08em; text-transform:uppercase; color:var(--text-2); margin:0 0 12px; }
.side-card ul{ list-style:none; margin:0; padding:0; }
.side-card li{ padding:7px 0; border-bottom:1px solid var(--border-light); font-size:.9rem; }
.side-card li:last-child{ border-bottom:none; }
.side-card a{ color:var(--text); } .side-card a:hover{ color:var(--primary); }
.side-card.is-brand{ background:var(--bg-alt); }
.side-card .blurb{ font-size:.86rem; color:var(--text-2); margin:0 0 10px; }
.side-rank{ counter-reset:r; }
.side-rank li{ display:flex; gap:9px; align-items:baseline; }
.side-rank li::before{ counter-increment:r; content:counter(r); font-family:var(--mono); font-weight:800; color:var(--primary); font-size:.82rem; min-width:1.1rem; }

/* ---------- article ---------- */
.article{ min-width:0; }
.article .cover{ height:180px; border-radius:var(--radius); margin:0 0 24px;
  background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 60%,#9b1c2a 100%);
  display:flex; align-items:center; justify-content:center; }
.article .cover span{ font-size:3.6rem; filter:drop-shadow(0 4px 12px rgba(0,0,0,.22)); }
.article h1{ font-size:clamp(1.55rem,3.6vw,2.2rem); margin:.2rem 0 .6rem; }
.byline{ display:flex; gap:12px; flex-wrap:wrap; align-items:center; font-size:.82rem; color:var(--text-muted); font-family:var(--mono); border-bottom:1px solid var(--border); padding-bottom:15px; margin-bottom:24px; }
.byline .au{ color:var(--text-2); font-weight:700; }
.article h2{ font-size:1.35rem; margin:2rem 0 .8rem; }
.article h3{ font-size:1.1rem; margin:1.5rem 0 .5rem; }
.article p,.article li{ font-size:1.02rem; color:var(--text); }
.article ul,.article ol{ padding-left:1.3rem; }
.article li{ margin:.35rem 0; }
.article code{ font-family:var(--mono); font-size:.86em; background:var(--bg-alt); color:var(--primary-dark); padding:2px 6px; border-radius:5px; }
.article pre{ background:#1e293b; color:#e2e8f0; border-radius:var(--radius-sm); padding:16px; overflow:auto; font-family:var(--mono); font-size:.82rem; line-height:1.6; }
.article pre code{ background:none; padding:0; color:inherit; }
.article blockquote{ border-left:3px solid var(--primary); margin:18px 0; padding:8px 16px; color:var(--text-2); background:var(--bg-alt); border-radius:0 var(--radius-sm) var(--radius-sm) 0; }
.faq dt{ font-weight:700; margin-top:16px; }
.faq dd{ margin:4px 0 0; color:var(--text-2); }
.related{ border-top:1px solid var(--border); margin-top:32px; padding-top:18px; }

/* ---------- footer（浅色清爽） ---------- */
.site-footer{ background:var(--bg-alt); border-top:1px solid var(--border); margin-top:10px; }
.site-footer .wrap{ padding:38px 22px 28px; display:grid; grid-template-columns:1.5fr 1fr 1fr; gap:30px; }
.site-footer h4{ color:var(--text); font-size:.76rem; font-family:var(--mono); letter-spacing:.08em; text-transform:uppercase; margin:0 0 12px; }
.site-footer a{ color:var(--text-2); font-size:.88rem; display:block; padding:3px 0; }
.site-footer a:hover{ color:var(--primary); }
.site-footer .brandblock p{ font-size:.86rem; color:var(--text-muted); margin:.4rem 0 0; }
.footbar{ border-top:1px solid var(--border); }
.footbar .wrap{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; padding:14px 22px; font-size:.76rem; color:var(--text-muted); font-family:var(--mono); }

/* ---------- responsive ---------- */
@media(max-width:900px){
  .layout{ grid-template-columns:1fr; gap:28px; }
  .sidebar{ position:static; }
  .grid--3{ grid-template-columns:1fr 1fr; }
  .site-footer .wrap{ grid-template-columns:1fr 1fr; }
}
@media(max-width:640px){
  .nav-toggle{ display:block; }
  .nav{ display:none; position:absolute; top:62px; left:0; right:0; background:#fff; border-bottom:1px solid var(--border); flex-direction:column; align-items:stretch; padding:8px 12px 14px; }
  .nav.open{ display:flex; }
  .nav a{ padding:11px 12px; border-radius:0; border-bottom:1px solid var(--border-light); }
  .grid--3,.grid--2{ grid-template-columns:1fr; }
  .section-head{ flex-direction:column; align-items:flex-start; gap:4px; }
  .site-footer .wrap{ grid-template-columns:1fr; }
  .rank .hide-sm{ display:none; }
}

/* ---------- 移动端触摸目标 ≥44px + 窄屏精简 ---------- */
@media(max-width:640px){
  .topbar .wrap > span:last-child{ display:none; }
  .nav a{ padding:13px 12px; }
  .nav-toggle{ width:44px; height:44px; }
  .btn{ padding:13px 20px; }
  .searchbar input,.searchbar button{ padding-top:14px; padding-bottom:14px; }
  .side-card a{ display:inline-block; padding:3px 0; }
}