:root{
  --bg:#f6f7fb; --card:#fff; --ink:#1a2030; --ink2:#5b6478; --line:#e7e9f0;
  --brand:#4f46e5; --brand2:#06b6d4; --soft:#eef0fb; --ok:#0f9d58;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6}
a{color:inherit;text-decoration:none}
.loading{padding:60px;text-align:center;color:var(--ink2)}

/* nav */
.nav{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:18px;padding:12px 22px;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.logo{font-size:18px;font-weight:850;display:flex;align-items:center;gap:9px}
.logo i{font-style:normal;font-size:12px;color:var(--ink2);font-weight:500}
.logo-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:16px}
.nav-links{display:flex;gap:18px;margin-left:8px}
.nav-links a{font-size:15px;font-weight:600;color:var(--ink2)}
.nav-links a:hover{color:var(--brand)}
.nav-state{margin-left:auto;font-size:12px;color:var(--ink2);background:#fff;border:1px solid var(--line);padding:4px 10px;border-radius:20px}
.nav-state b{color:var(--ok)}
.nav-auth{margin-left:auto;font-size:13px}
.nav-auth a{font-weight:700;color:var(--brand);background:var(--soft);padding:6px 14px;border-radius:20px}
.nav-auth a:hover{background:var(--brand);color:#fff}

.wrap{max-width:1040px;margin:0 auto;padding:24px 16px 60px}

/* hero */
.hero{text-align:center;padding:48px 16px 30px;background:linear-gradient(180deg,#eef1ff,transparent)}
.hero h1{font-size:32px;font-weight:850;letter-spacing:.5px}
.hero p{color:var(--ink2);font-size:16px;margin-top:12px}
.searchbox{max-width:620px;margin:24px auto 0;display:flex;gap:8px}
.searchbox input{flex:1;font-size:16px;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:#fff;font-family:inherit}
.searchbox input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.searchbox button{border:none;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:700;font-size:16px;padding:0 24px;border-radius:12px;cursor:pointer}
.hot-qs{margin-top:14px;font-size:13px;color:var(--ink2)}
.hot-qs a{color:var(--brand);margin:0 6px}

/* sections */
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin:30px 0 14px}
.sec-head h2{font-size:20px}
.sec-head .cat-ico{margin-right:6px}
.sec-head a{font-size:13px;color:var(--brand)}

/* 首页四大门户卡片 */
.portal{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:6px 0 8px}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 18px;display:flex;flex-direction:column;gap:6px;transition:.15s;box-shadow:0 2px 10px rgba(30,40,80,.04)}
.pcard:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 14px 32px rgba(79,70,229,.12)}
.pcard .pi{font-size:30px}
.pcard b{font-size:18px}
.pcard span{font-size:13px;color:var(--ink2)}
.pcard.dim{opacity:.72}
@media(max-width:820px){.portal{grid-template-columns:repeat(2,1fr)}}
@media(max-width:460px){.portal{grid-template-columns:1fr}}
.task-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:14px 0}
@media(max-width:820px){.task-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:460px){.task-grid{grid-template-columns:1fr}}

/* tool grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:14px}
.tcard{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;cursor:pointer;transition:.15s;display:flex;flex-direction:column;gap:6px}
.tcard:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:0 10px 26px rgba(79,70,229,.1)}
.tcard .ti{font-size:24px}
.tcard .tn{font-size:16px;font-weight:750}
.tcard .td{font-size:13px;color:var(--ink2);flex:1}
.tcard .ta{font-size:12px;color:var(--brand);background:var(--soft);align-self:flex-start;padding:2px 9px;border-radius:20px}

/* article list */
.alist{display:grid;gap:10px}
.acard{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;cursor:pointer}
.acard:hover{border-color:var(--brand)}
.acard .at{font-size:16px;font-weight:750}
.acard .as{font-size:13px;color:var(--ink2);margin-top:3px}
.acard .ac{font-size:11px;color:var(--brand);background:var(--soft);padding:2px 8px;border-radius:20px;margin-right:6px}

/* tool detail / form */
.back{display:inline-block;font-size:14px;color:var(--brand);margin-bottom:14px;cursor:pointer}
.panel{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin-bottom:16px}
.panel h1{font-size:23px}
.panel .lead{color:var(--ink2);font-size:14px;margin-top:6px}
.field{margin-top:14px}
.field label{display:block;font-size:14px;font-weight:650;margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;font-size:15px;font-family:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fff}
.field textarea{min-height:96px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.runbtn{margin-top:18px;width:100%;border:none;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800;font-size:17px;padding:14px;border-radius:12px;cursor:pointer}
.runbtn:disabled{opacity:.6;cursor:wait}

/* result */
.result{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin-bottom:16px}
.result-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.result-head .by{font-size:12px;color:var(--ink2)}
.result-out{white-space:pre-wrap;font-size:15px;line-height:1.85;color:var(--ink);background:#fbfcff;border:1px solid var(--line);border-radius:10px;padding:16px;max-height:560px;overflow:auto}
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:650;font-size:14px;padding:8px 14px;border-radius:9px;cursor:pointer}
.btn:hover{background:#f4f5fb}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.refine{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.refine .btn{font-size:13px;padding:6px 12px}

/* article view */
.article{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;max-width:760px;margin:0 auto}
.article h1{font-size:26px;margin:0 0 6px}
.article .meta{font-size:13px;color:var(--ink2);margin-bottom:18px}
.md h1{font-size:22px;margin:22px 0 10px}
.md h2{font-size:18px;margin:20px 0 8px;padding-left:11px;border-left:4px solid var(--brand)}
.md p{margin:0 0 13px;font-size:16px}
.md ul{margin:0 0 13px;padding-left:22px}
.md li{margin:0 0 6px}
.md blockquote{border-left:4px solid var(--brand2);background:var(--soft);padding:10px 14px;border-radius:0 8px 8px 0;margin:0 0 13px;color:var(--ink2)}
.md b{color:var(--ink)}
.related{margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}
.related .btn{margin:4px 6px 0 0;display:inline-block}

/* 深度指南 book 布局 */
.guide{display:grid;grid-template-columns:250px 1fr;gap:24px;align-items:start}
.guide-toc{position:sticky;top:64px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 14px;max-height:calc(100vh - 90px);overflow:auto}
.guide-toc .gt-title{font-size:13px;color:var(--ink2);font-weight:700;margin-bottom:10px}
.guide-toc ol{list-style:none;counter-reset:c}
.guide-toc li{counter-increment:c;margin:0 0 3px}
.guide-toc a{display:block;font-size:13px;color:var(--ink2);padding:6px 8px;border-radius:8px;cursor:pointer;line-height:1.4}
.guide-toc a:hover{background:var(--soft);color:var(--brand)}
.guide-body{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px 30px;min-width:0}
.guide-body h1{font-size:27px;margin:0 0 6px}
.guide-body .lead{color:var(--ink2);font-size:15px;margin-bottom:18px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.guide-body section{scroll-margin-top:70px;padding:14px 0;border-bottom:1px dashed var(--line)}
.guide-body section h2{font-size:20px;margin:0 0 10px;padding-left:11px;border-left:4px solid var(--brand)}
.guide-body .todo{color:#98a2b3;font-size:14px;background:#f8fafc;border:1px dashed var(--line);border-radius:8px;padding:12px}
.md h3{font-size:16px;margin:14px 0 6px}
@media(max-width:760px){.guide{grid-template-columns:1fr}.guide-toc{position:static;max-height:none}}
.empty{padding:40px;text-align:center;color:var(--ink2)}

/* 登录/注册/我的（M2） */
.authwrap{max-width:420px;margin:40px auto}
.authwrap h1{font-size:24px;margin-bottom:16px;text-align:center}
.authwrap .switch{margin-top:14px;text-align:center;color:var(--ink2);font-size:14px}
.authwrap .switch a{color:var(--brand);font-weight:700}
.paid-locked{margin-top:20px;padding:16px;background:var(--soft);border:1px dashed var(--brand);border-radius:12px}
.paid-locked p{margin:0 0 10px}
.me-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.me-row:last-child{border-bottom:none}
.me-row .lbl{color:var(--ink2);font-size:14px}
.me-row .val{font-weight:700}
.quota-bar{height:8px;border-radius:6px;background:var(--soft);overflow:hidden;margin-top:8px;width:180px}
.quota-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2))}
.keybox{display:flex;align-items:center;gap:8px;font-family:monospace;font-size:13px;background:var(--soft);padding:8px 12px;border-radius:8px;overflow:hidden}
.keybox span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 广告位占位符：接入 AdSense 前先占位置，别让布局跳动 */
.ad-slot{margin:22px 0;padding:14px;border:1px dashed var(--line);border-radius:12px;background:#fbfcff;text-align:center;color:var(--ink2);font-size:12px}

/* Skills 验证徽章：诚实标注有没有真的实测过，不是营销噱头 */
.badge{display:inline-block;font-size:12px;font-weight:700;padding:2px 10px;border-radius:20px;margin-left:6px}
.badge-ok{background:#e7f7ee;color:var(--ok)}
.badge-warn{background:#fff6e5;color:#b8790a}
.badge-dim{background:var(--soft);color:var(--ink2)}
.cmd-block{background:#1a2030;color:#d6f5e3;font-family:monospace;font-size:13px;padding:14px 16px;border-radius:10px;overflow-x:auto;white-space:pre;line-height:1.7}
.install-box{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap;align-items:flex-start}
.install-cmds{width:100%;margin-top:12px;padding:14px;border:1px solid var(--line);border-radius:12px;background:#fbfcff}
.install-cmds p{font-size:13px;color:var(--ink2);margin-bottom:10px}
.install-cmds b{display:block;margin:10px 0 6px}
.install-cmds .btn{margin:4px 8px 8px 0}
.foot{text-align:center;color:var(--ink2);font-size:13px;padding:24px;border-top:1px solid var(--line)}
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(20px);opacity:0;background:#1a2030;color:#fff;padding:11px 20px;border-radius:10px;font-size:14px;pointer-events:none;transition:.25s;z-index:50}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(max-width:640px){.hero h1{font-size:25px}.searchbox{flex-direction:column}.nav-links{display:none}}