/* ============================================================
   知库 · 简约知识库
   设计语言：宣纸底 + 墨色字 + 一点砖红；大量留白，细线分隔
   ============================================================ */

:root{
  --paper:#fbfaf7;
  --card:#ffffff;
  --ink:#15171b;
  --ink-2:#3b414b;
  --muted:#868c96;
  --line:#e8e5de;
  --line-2:#f0ede7;
  --accent:#c1502e;
  --accent-soft:#f6ece7;

  --serif:"Noto Serif SC","Songti SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"Cascadia Code",Consolas,monospace;

  --radius:14px;
  --shadow-sm:0 1px 2px rgba(21,23,27,.04);
  --shadow-md:0 10px 30px -12px rgba(21,23,27,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea,select{font:inherit;color:inherit}
img{max-width:100%;display:block}
::selection{background:#f3d9cf;color:#5a2413}

/* ---------- 布局 ---------- */
.wrap{width:min(1120px,calc(100% - 48px));margin:0 auto}
.narrow{width:min(760px,calc(100% - 48px));margin:0 auto}

/* ---------- 顶栏 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(251,250,247,.82);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line-2);
}
.nav-in{display:flex;align-items:center;gap:28px;height:62px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--serif);font-size:18px;letter-spacing:.14em;font-weight:600}
.brand .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);display:inline-block;transform:translateY(-2px)}
.nav-links{display:flex;gap:26px;margin-left:auto;align-items:center;font-size:14px;color:var(--ink-2)}
.nav-links a{position:relative;padding:4px 0;transition:color .2s}
.nav-links a:hover{color:var(--accent)}
.nav-links a.active{color:var(--ink)}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);border-radius:2px;
}
.nav-links a.cta{
  display:inline-flex;align-items:center;height:34px;padding:0 15px;border:1px solid var(--line);
  border-radius:9px;background:var(--card);font-size:13.5px;color:var(--ink);letter-spacing:.02em;
  transition:border-color .2s,transform .2s var(--ease),box-shadow .2s;
}
.nav-links a.cta:hover{border-color:#cfc9bd;transform:translateY(-1px);box-shadow:var(--shadow-sm);color:var(--ink)}
.nav-user{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.avatar{
  width:30px;height:30px;border-radius:50%;display:grid;place-items:center;
  background:var(--accent-soft);color:#8d3a20;font-size:13px;font-weight:600;letter-spacing:0;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  height:40px;padding:0 18px;border-radius:10px;
  border:1px solid var(--line);background:var(--card);
  font-size:14px;color:var(--ink);
  transition:all .22s var(--ease);
  white-space:nowrap;
}
.btn:hover{border-color:#d8d3c8;transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--ink);border-color:var(--ink);color:#fbfaf7}
.btn-primary:hover{background:#000;border-color:#000;box-shadow:0 10px 24px -12px rgba(0,0,0,.5)}
.btn-ghost{background:transparent;border-color:transparent;color:var(--ink-2)}
.btn-ghost:hover{background:var(--line-2);color:var(--ink)}
.btn-sm{height:32px;padding:0 12px;font-size:13px;border-radius:8px}
.btn-danger{color:#a6331a;border-color:#f0d9d2}
.btn-danger:hover{background:#fdf4f1;border-color:#e5c0b4}

/* ---------- 首页 Hero ---------- */
.hero{position:relative;padding:92px 0 44px;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:-40% -10% auto -10%;height:620px;
  background:
    radial-gradient(46% 52% at 22% 24%, rgba(193,80,46,.09), transparent 70%),
    radial-gradient(40% 46% at 78% 12%, rgba(90,120,140,.10), transparent 72%);
  filter:blur(6px);pointer-events:none;
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--line-2) 1px,transparent 1px),linear-gradient(90deg,var(--line-2) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(70% 60% at 50% 30%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(70% 60% at 50% 30%,#000 20%,transparent 78%);
}
.hero-in{position:relative;z-index:2}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);
  margin-bottom:26px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--accent)}
h1.title{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(34px,5.4vw,58px);line-height:1.24;letter-spacing:.01em;
  margin:0 0 22px;max-width:14em;
}
h1.title em{font-style:normal;color:var(--accent);position:relative;white-space:nowrap}
h1.title em::after{content:"";position:absolute;left:0;right:0;bottom:.06em;height:.14em;background:var(--accent-soft);z-index:-1}
.lede{font-size:16px;color:var(--ink-2);max-width:34em;margin:0 0 38px}
.caret{display:inline-block;width:2px;height:1em;background:var(--accent);vertical-align:-.12em;margin-left:3px;animation:blink 1.05s step-end infinite}
@keyframes blink{50%{opacity:0}}

.search{
  display:flex;align-items:center;gap:10px;max-width:520px;
  border:1px solid var(--line);background:var(--card);border-radius:12px;
  padding:0 14px;height:50px;box-shadow:var(--shadow-sm);
  transition:border-color .2s,box-shadow .2s;
}
.search:focus-within{border-color:#cfc9bd;box-shadow:0 8px 28px -16px rgba(21,23,27,.3)}
.search svg{flex:none;color:var(--muted)}
.search input{flex:1;border:0;outline:0;background:none;height:100%;font-size:14.5px}
.search input::placeholder{color:#a9aeb6}
.search kbd{
  font-family:var(--mono);font-size:11px;color:var(--muted);
  border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:1px 6px;background:var(--paper);
}

/* ---------- 统计 ---------- */
.stats{display:flex;gap:56px;margin-top:52px;flex-wrap:wrap}
.stat b{display:block;font-family:var(--serif);font-size:34px;font-weight:600;line-height:1.1;letter-spacing:.01em}
.stat span{font-size:12.5px;color:var(--muted);letter-spacing:.1em}

/* ---------- 区块 ---------- */
.section{padding:64px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:34px}
.section-head h2{
  font-family:var(--serif);font-size:26px;font-weight:600;margin:0;letter-spacing:.02em;
}
.section-head p{margin:6px 0 0;color:var(--muted);font-size:13.5px}
.section-head .more{font-size:13.5px;color:var(--ink-2);display:inline-flex;align-items:center;gap:6px;transition:gap .2s,color .2s}
.section-head .more:hover{gap:10px;color:var(--accent)}

/* ---------- 知识卡片 ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 24px 20px;position:relative;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s;
  display:flex;flex-direction:column;cursor:pointer;min-height:196px;
  animation:rise .5s var(--ease) both;
}
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#ddd8cd}
.card::after{
  content:"";position:absolute;left:0;top:22px;bottom:22px;width:2px;border-radius:2px;
  background:var(--accent);opacity:0;transform:scaleY(.4);transition:opacity .28s,transform .28s var(--ease);
}
.card:hover::after{opacity:1;transform:scaleY(1)}
.card .tag{
  align-self:flex-start;font-size:11.5px;letter-spacing:.08em;
  color:#8d3a20;background:var(--accent-soft);border-radius:99px;padding:3px 10px;margin-bottom:14px;
}
.card h3{
  font-family:var(--serif);font-size:19px;font-weight:600;margin:0 0 10px;line-height:1.45;letter-spacing:.01em;
}
.card p{margin:0;color:var(--ink-2);font-size:13.8px;line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card .meta{margin-top:auto;padding-top:16px;display:flex;justify-content:space-between;align-items:center;
  font-size:12px;color:var(--muted);letter-spacing:.04em}

/* ---------- 程序卡片 ---------- */
.apps{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:16px}
.app{
  display:flex;gap:14px;align-items:flex-start;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;transition:transform .26s var(--ease),box-shadow .26s var(--ease),border-color .26s;
  animation:rise .5s var(--ease) both;
}
.app:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:#ddd8cd}
.app .ico{
  flex:none;width:42px;height:42px;border-radius:11px;display:grid;place-items:center;
  font-size:20px;background:var(--paper);border:1px solid var(--line);
}
.app h4{margin:1px 0 5px;font-size:15px;font-weight:600;letter-spacing:.01em}
.app p{margin:0;font-size:13px;color:var(--muted);line-height:1.6}
.app .arrow{margin-left:auto;color:#c9cdd4;transition:transform .26s var(--ease),color .26s;align-self:center}
.app:hover .arrow{transform:translateX(3px);color:var(--accent)}

/* ---------- 登录 ---------- */
.auth-wrap{min-height:calc(100vh - 62px);display:flex;align-items:center;justify-content:center;padding:48px 20px;position:relative;overflow:hidden}
.auth-wrap::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(50% 44% at 50% 8%,rgba(193,80,46,.07),transparent 70%);
}
.auth-card{
  position:relative;width:100%;max-width:400px;background:var(--card);
  border:1px solid var(--line);border-radius:18px;padding:40px 36px 34px;
  box-shadow:0 24px 60px -34px rgba(21,23,27,.35);
}
.auth-card h2{font-family:var(--serif);font-size:25px;font-weight:600;margin:0 0 8px}
.auth-card .sub{color:var(--muted);font-size:13.5px;margin:0 0 28px}
.field{margin-bottom:16px}
.field label{display:block;font-size:12.5px;color:var(--ink-2);margin-bottom:7px;letter-spacing:.04em}
.input{
  width:100%;height:44px;border:1px solid var(--line);border-radius:10px;background:var(--paper);
  padding:0 13px;outline:0;transition:border-color .2s,background .2s,box-shadow .2s;font-size:14.5px;
}
.input:focus{border-color:#cfc9bd;background:var(--card);box-shadow:0 0 0 3px rgba(193,80,46,.08)}
textarea.input{height:auto;padding:11px 13px;resize:vertical;line-height:1.7}
select.input{appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2 4l4 4 4-4' fill='none' stroke='%23868c96' stroke-width='1.4' stroke-linecap='round'/></svg>");background-repeat:no-repeat;background-position:right 13px center;padding-right:34px}
.auth-card .btn{width:100%;height:44px;margin-top:6px}
.auth-foot{margin-top:22px;font-size:13px;color:var(--muted);display:flex;justify-content:center;flex-wrap:wrap;gap:6px 16px;text-align:center}
.auth-foot a{color:var(--accent);border-bottom:1px solid transparent;transition:border-color .2s}
.auth-foot a:hover{border-color:currentColor}
.hint{margin-top:18px;padding:12px 14px;border-radius:10px;background:var(--paper);
  border:1px dashed var(--line);font-size:12.5px;color:var(--muted);line-height:1.75}
.hint code{font-family:var(--mono);font-size:12px;color:var(--ink-2);background:#f2efe8;padding:1px 6px;border-radius:4px}
.form-err{color:#b03a1e;font-size:13px;margin:-6px 0 12px;min-height:0}

/* ---------- 后台 ---------- */
.dash{display:grid;grid-template-columns:216px 1fr;gap:44px;padding:40px 0 80px;align-items:start}
.side{position:sticky;top:96px}
.side h5{font-size:11.5px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase;margin:0 0 12px;font-weight:500}
.side nav{display:flex;flex-direction:column;gap:2px}
.side nav a{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:9px;
  font-size:14px;color:var(--ink-2);transition:background .18s,color .18s;
}
.side nav a:hover{background:var(--line-2);color:var(--ink)}
.side nav a.on{background:var(--ink);color:#fbfaf7}
.side nav a .n{margin-left:auto;font-size:11.5px;opacity:.6}
.side .side-card{margin-top:28px;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.side .side-card b{display:block;font-size:13px;margin-bottom:4px}
.side .side-card span{font-size:12.5px;color:var(--muted);line-height:1.65;display:block}

.panel-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}
.panel-head h1{font-family:var(--serif);font-size:25px;font-weight:600;margin:0;letter-spacing:.02em}
.panel-head p{margin:5px 0 0;color:var(--muted);font-size:13.5px}

.rows{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--card)}
.row{
  display:grid;grid-template-columns:1fr 108px 120px 96px;gap:16px;align-items:center;
  padding:16px 20px;border-bottom:1px solid var(--line-2);
  transition:background .18s;
}
.row:last-child{border-bottom:0}
.row:hover{background:#fcfbf8}
.row .t{min-width:0}
.row .t b{display:block;font-size:14.5px;font-weight:600;margin-bottom:3px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row .t span{font-size:12.5px;color:var(--muted);
  display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.row .tagc{font-size:11.5px;color:#8d3a20;background:var(--accent-soft);border-radius:99px;padding:3px 10px;justify-self:start;white-space:nowrap}
.row .date{font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.row .acts{display:flex;gap:6px;justify-content:flex-end;opacity:0;transition:opacity .18s}
.row:hover .acts{opacity:1}
.icon-btn{
  width:30px;height:30px;border-radius:8px;display:grid;place-items:center;color:var(--muted);
  transition:background .18s,color .18s;
}
.icon-btn:hover{background:var(--line-2);color:var(--ink)}
.icon-btn.del:hover{background:#fdf1ed;color:#a6331a}

.empty{padding:64px 24px;text-align:center;color:var(--muted)}
.empty b{display:block;font-family:var(--serif);font-size:17px;color:var(--ink-2);margin-bottom:6px;font-weight:600}
.empty p{margin:0 0 18px;font-size:13.5px}

/* ---------- 弹层 ---------- */
.mask{
  position:fixed;inset:0;background:rgba(21,23,27,.32);backdrop-filter:blur(3px);
  display:grid;place-items:center;padding:24px;z-index:100;
  animation:fade .2s var(--ease);
}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal{
  width:min(560px,100%);max-height:86vh;overflow:auto;background:var(--card);
  border-radius:18px;padding:30px 32px;box-shadow:0 30px 80px -30px rgba(21,23,27,.5);
  animation:pop .26s var(--ease);
}
@keyframes pop{from{opacity:0;transform:translateY(12px) scale(.985)}to{opacity:1;transform:none}}
.modal h3{font-family:var(--serif);font-size:21px;margin:0 0 6px;font-weight:600}
.modal .m-sub{color:var(--muted);font-size:13px;margin:0 0 24px}
.modal .m-foot{display:flex;gap:10px;justify-content:flex-end;margin-top:24px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* ---------- 阅读弹层 ---------- */
.reader{width:min(680px,100%)}
.reader .r-tag{font-size:11.5px;letter-spacing:.08em;color:#8d3a20;background:var(--accent-soft);
  border-radius:99px;padding:3px 10px;display:inline-block;margin-bottom:16px}
.reader h2{font-family:var(--serif);font-size:26px;line-height:1.4;margin:0 0 8px;font-weight:600}
.reader .r-meta{font-size:12.5px;color:var(--muted);margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.reader .r-body{font-size:15px;line-height:1.95;color:var(--ink-2);white-space:pre-wrap;word-break:break-word}

/* ---------- 页脚 ---------- */
.foot{border-top:1px solid var(--line-2);padding:36px 0;margin-top:20px}
.foot-in{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:var(--muted)}
.foot-in a:hover{color:var(--accent)}

/* ---------- 响应式 ---------- */
@media (max-width:860px){
  .wrap,.narrow{width:calc(100% - 36px)}
  .hero{padding:64px 0 48px}
  .stats{gap:32px;margin-top:44px}
  .stat b{font-size:27px}
  .section{padding:52px 0}
  .dash{grid-template-columns:1fr;gap:24px}
  .side{position:static}
  .side nav{flex-direction:row;overflow:auto;gap:6px;padding-bottom:4px}
  .side nav a{white-space:nowrap}
  .side .side-card{display:none}
  .row{grid-template-columns:1fr auto;gap:10px}
  .row .tagc,.row .date{display:none}
  .row .acts{opacity:1}
  .two{grid-template-columns:1fr}
  .nav-links{gap:16px}
  .nav-links a.hide-sm{display:none}
}
@media (max-width:520px){
  .grid,.apps{grid-template-columns:1fr}
  .auth-card{padding:30px 24px}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}