:root{
  --bg:#080808;
  --bg-2:#0d0d0d;
  --panel:rgba(23,23,23,.72);
  --panel-solid:#141414;
  --panel-2:rgba(31,31,31,.6);
  --line:rgba(255,255,255,.075);
  --line-2:rgba(255,255,255,.13);
  --text:#eeeeee;
  --text-2:#b8b8b8;
  --muted:#878787;
  --faint:#636363;
  --acc:#898989;
  --acc-soft:rgba(137,137,137,.14);
  --acc-2:#acacac;
  --gold:#bababa;
  --danger:#8c8c8c;
  --grad:linear-gradient(135deg,#ababab 0%,#7b7b7b 100%);
  --grad-2:linear-gradient(135deg,#acacac 0%,#8b8b8b 100%);
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 24px 64px rgba(0,0,0,.45);
  --shadow-sm:0 8px 24px rgba(0,0,0,.28);
  --mono:"SF Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--text);font-family:var(--sans);
  font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased;
  min-height:100vh;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea,select{font-family:inherit;color:inherit}
.hidden{display:none!important}
::selection{background:rgba(137,137,137,.3)}

/* ---------- 背景 ---------- */
.bg-layer{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;background:
  radial-gradient(1200px 600px at 12% -10%,rgba(76,76,76,.20),transparent 60%),
  radial-gradient(900px 500px at 88% 0%,rgba(76,76,76,.16),transparent 60%),
  linear-gradient(180deg,#080808 0%,#0b0b0b 40%,#080808 100%)}
.bg-grid{position:absolute;inset:0;opacity:.20;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 78%)}
.bg-glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5}
.g1{width:520px;height:520px;left:-140px;top:-180px;background:rgba(103,103,103,.35)}
.g2{width:420px;height:420px;right:-120px;top:120px;background:rgba(138,138,138,.22)}
.g3{width:600px;height:600px;left:35%;bottom:-420px;background:rgba(84,84,84,.18)}

/* ---------- 通用 ---------- */
.eyebrow{font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 16px;border-radius:11px;font-size:14px;font-weight:600;
  border:1px solid var(--line-2);background:rgba(255,255,255,.04);color:var(--text);
  transition:.18s ease;white-space:nowrap;
}
.btn:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.22)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--grad);border-color:transparent;color:#0f0f0f;box-shadow:0 8px 26px rgba(123,123,123,.28)}
.btn.primary:hover{filter:brightness(1.06)}
.btn.ghost{background:transparent}
.btn.sm{height:32px;padding:0 12px;font-size:13px;border-radius:9px}
.btn.lg{height:46px;font-size:15px;border-radius:12px}
.btn.block{width:100%}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn svg{width:16px;height:16px}
.tag{display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 9px;border-radius:7px;
  font-size:11.5px;font-weight:600;letter-spacing:.03em;background:rgba(255,255,255,.055);color:var(--text-2);
  border:1px solid var(--line)}
.tag.acc{background:var(--acc-soft);color:#bbbbbb;border-color:rgba(137,137,137,.25)}
.tag.green{background:rgba(172,172,172,.12);color:#c8c8c8;border-color:rgba(172,172,172,.24)}
.tag.gold{background:rgba(186,186,186,.12);color:#cccccc;border-color:rgba(186,186,186,.24)}
.tag.red{background:rgba(140,140,140,.1);color:#b0b0b0;border-color:rgba(140,140,140,.22)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  backdrop-filter:blur(18px) saturate(1.1);box-shadow:var(--shadow-sm)}
.pad{padding:24px}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.spacer{flex:1}
.icon{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
hr.sep{border:0;border-top:1px solid var(--line);margin:22px 0}

/* ---------- 登录页 ---------- */
.login-wrap{position:relative;z-index:1;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:48px 28px}
.login-shell{width:min(1180px,100%);display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.login-brand{padding:8px 0}
.brand-mark{width:38px;height:38px;border-radius:11px;display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(150deg,rgba(137,137,137,.22),rgba(172,172,172,.10));border:1px solid rgba(158,158,158,.28);color:#c4c4c4}
.brand-mark svg{width:22px;height:22px}
.brand-mark.big{width:54px;height:54px;border-radius:15px;margin-bottom:26px}
.brand-mark.big svg{width:30px;height:30px}
.login-brand h1{font-size:40px;line-height:1.24;letter-spacing:-.02em;margin:0 0 18px;font-weight:700}
.lead{color:var(--text-2);font-size:15px;max-width:520px;margin:0 0 26px}
.brand-points{list-style:none;margin:0 0 32px;padding:0;display:grid;gap:12px;max-width:560px}
.brand-points li{display:flex;gap:11px;align-items:flex-start;color:var(--text-2);font-size:13.5px}
.pt-ico{width:18px;height:18px;border-radius:50%;flex:none;margin-top:3px;
  background:radial-gradient(circle at 50% 50%,rgba(172,172,172,.7) 0 3px,transparent 3px 100%);
  border:1px solid rgba(172,172,172,.35)}
.code-window{max-width:470px;border:1px solid var(--line-2);border-radius:14px;overflow:hidden;background:rgba(10,10,10,.75);box-shadow:var(--shadow)}
.cw-bar{display:flex;align-items:center;gap:7px;height:36px;padding:0 14px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.025)}
.cw-bar i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.16)}
.cw-bar span{margin-left:8px;font-size:11.5px;color:var(--faint);font-family:var(--mono)}
.code-window pre{margin:0;padding:16px 18px;font-family:var(--mono);font-size:12.5px;line-height:1.9;color:#c7c7c7;overflow:auto}
.code-window .ln{color:#474747;display:inline-block;width:18px;user-select:none}
.brand-foot{color:var(--faint);font-size:11.5px;margin-top:28px}
.login-panel{display:flex;flex-direction:column;align-items:center}
.login-card{width:100%;max-width:430px;background:rgba(20,20,20,.82);border:1px solid var(--line-2);border-radius:22px;
  padding:30px 32px 26px;backdrop-filter:blur(24px);box-shadow:var(--shadow)}
.seg{display:flex;gap:6px;padding:4px;border-radius:11px;background:rgba(255,255,255,.045);border:1px solid var(--line);margin-bottom:26px}
.seg-btn{flex:1;height:35px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--muted);transition:.18s}
.seg-btn.active{background:rgba(255,255,255,.09);color:var(--text);box-shadow:0 2px 10px rgba(0,0,0,.25)}
.auth-form h2{font-size:24px;margin:0 0 8px;letter-spacing:-.01em}
.form-sub{color:var(--muted);font-size:13px;margin:0 0 22px;line-height:1.6}
.field{display:block;margin-bottom:15px}
.field>span{display:block;font-size:12.5px;color:var(--text-2);margin-bottom:7px;font-weight:500}
.field input{width:100%;height:44px;border-radius:11px;border:1px solid var(--line-2);background:rgba(255,255,255,.035);
  padding:0 14px;font-size:14.5px;outline:none;transition:.16s}
.field input::placeholder{color:#636363}
.field input:focus{border-color:rgba(137,137,137,.55);background:rgba(137,137,137,.07);box-shadow:0 0 0 3px rgba(137,137,137,.12)}
.pw-wrap{position:relative}
.pw-wrap input{padding-right:44px}
.pw-eye{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:34px;height:34px;border-radius:8px;
  display:flex;align-items:center;justify-content:center;color:var(--faint)}
.pw-eye:hover{color:var(--text-2);background:rgba(255,255,255,.06)}
.pw-eye svg{width:17px;height:17px}
.pw-rule{list-style:none;margin:-4px 0 16px;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:7px 12px}
.pw-rule li{display:flex;align-items:center;gap:7px;font-size:11.5px;color:var(--faint);transition:.16s}
.pw-rule i{width:13px;height:13px;border-radius:50%;border:1px solid rgba(255,255,255,.18);display:inline-block;position:relative;flex:none}
.pw-rule li.ok{color:#c9c9c9}
.pw-rule li.ok i{background:rgba(172,172,172,.85);border-color:transparent}
.pw-rule li.ok i::after{content:"";position:absolute;left:3.5px;top:1.5px;width:4px;height:7px;
  border-right:1.6px solid #0f0f0f;border-bottom:1.6px solid #0f0f0f;transform:rotate(38deg)}
.form-error{min-height:18px;font-size:12.5px;color:var(--danger);margin:2px 0 10px;line-height:1.5}
.form-tip{font-size:11.5px;color:var(--faint);margin:14px 0 0;line-height:1.7;text-align:center}
.form-tip b{color:var(--text-2)}
.login-note{color:var(--faint);font-size:11px;margin:18px 0 0;text-align:center}

/* ---------- 顶栏 ---------- */
.app{position:relative;z-index:1;min-height:100vh;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:26px;height:66px;
  padding:0 30px;border-bottom:1px solid var(--line);background:rgba(11,11,11,.72);backdrop-filter:blur(22px) saturate(1.2)}
.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:15.5px;letter-spacing:.13em}
.brand-text small{font-size:10.5px;color:var(--faint);letter-spacing:.04em}
.top-nav{display:flex;align-items:center;gap:4px;height:100%;flex:1;justify-content:center}
.nav-item{position:relative;display:flex;align-items:center;gap:8px;height:38px;padding:0 15px;border-radius:10px;
  font-size:13.5px;color:var(--muted);font-weight:500;transition:.16s}
.nav-item .icon{width:17px;height:17px;opacity:.85}
.nav-item:hover{color:var(--text-2);background:rgba(255,255,255,.045)}
.nav-item.active{color:var(--text);background:rgba(137,137,137,.12);border:1px solid rgba(137,137,137,.22)}
.nav-item.active .icon{color:#bbbbbb;opacity:1}
.top-actions{display:flex;align-items:center;gap:12px;flex:none}
.user-chip{position:relative;display:flex;align-items:center;gap:9px;height:38px;padding:0 10px 0 6px;border-radius:11px;
  cursor:pointer;transition:.16s}
.user-chip:hover{background:rgba(255,255,255,.05)}
.chip-name{font-size:13.5px;color:var(--text-2);max-width:110px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chip-caret{color:var(--faint)}
.user-menu{position:absolute;top:48px;right:0;min-width:160px;padding:6px;border-radius:12px;
  background:rgba(21,21,21,.96);border:1px solid var(--line-2);box-shadow:var(--shadow);display:none;backdrop-filter:blur(20px)}
.user-menu.open{display:block}
.user-menu button{display:flex;width:100%;align-items:center;height:36px;padding:0 12px;border-radius:8px;
  font-size:13px;color:var(--text-2);text-align:left}
.user-menu button:hover{background:rgba(255,255,255,.06);color:var(--text)}
.avatar{width:36px;height:36px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;letter-spacing:.04em;color:#e7e7e7;flex:none;overflow:hidden;
  background:linear-gradient(145deg,#5a5a5a,#393939);border:1px solid rgba(255,255,255,.14)}
.avatar.sm{width:30px;height:30px;font-size:11.5px}
.avatar.lg{width:76px;height:76px;font-size:26px;border-radius:22px}
.avatar img{width:100%;height:100%;object-fit:cover;display:block}
.avatar.admin{background:linear-gradient(145deg,#5d5d5d,#393939);color:#dddddd;border-color:rgba(186,186,186,.3)}
.view{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:34px 30px 60px}
.tabbar{display:none}

/* ---------- 首页 ---------- */
.hero{position:relative;overflow:hidden;border-radius:24px;border:1px solid var(--line-2);
  background:linear-gradient(120deg,rgba(35,35,35,.9),rgba(17,17,17,.86) 55%,rgba(27,27,27,.72));
  padding:38px 40px;display:grid;grid-template-columns:1.4fr auto;gap:30px;align-items:center;
  box-shadow:var(--shadow)}
.hero::after{content:"";position:absolute;right:-90px;top:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(137,137,137,.24),transparent 66%);pointer-events:none}
.hero::before{content:"";position:absolute;left:18%;bottom:-160px;width:400px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(172,172,172,.16),transparent 70%);pointer-events:none}
.hero h1{margin:0 0 10px;font-size:30px;letter-spacing:-.02em;line-height:1.3}
.hero p{margin:0;color:var(--text-2);font-size:14px;max-width:600px}
.hero .hero-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:24px;color:var(--muted);font-size:12.5px}
.hero .hero-meta span{display:inline-flex;align-items:center;gap:6px}
.ring-wrap{position:relative;width:132px;height:132px;flex:none;display:flex;align-items:center;justify-content:center;margin:auto}
.ring-wrap svg{position:absolute;inset:0;transform:rotate(-90deg)}
.ring-wrap .ring-val{position:relative;text-align:center;line-height:1.2}
.ring-val b{display:block;font-size:29px;letter-spacing:-.02em}
.ring-val small{color:var(--muted);font-size:11px}
.grid{display:grid;gap:18px}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
.stat-card{padding:20px 22px;border-radius:16px;border:1px solid var(--line);background:var(--panel);position:relative;overflow:hidden}
.stat-card .lbl{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;margin-bottom:10px}
.stat-card .val{font-size:27px;font-weight:700;letter-spacing:-.02em;line-height:1.1}
.stat-card .val small{font-size:12px;color:var(--faint);font-weight:500;margin-left:4px}
.stat-card .bar{height:4px;border-radius:3px;background:rgba(255,255,255,.08);margin-top:13px;overflow:hidden}
.stat-card .bar i{display:block;height:100%;border-radius:3px;background:var(--grad)}
.stat-card.acc .val{color:#d3d3d3}
.stat-card.green .val{color:#cccccc}
.stat-card.gold .val{color:#cfcfcf}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin:34px 0 16px}
.section-head h2{margin:0;font-size:19px;letter-spacing:-.01em}
.section-head p{margin:3px 0 0;color:var(--muted);font-size:12.5px}
.link-more{font-size:12.5px;color:#bbbbbb;display:inline-flex;align-items:center;gap:5px}
.link-more:hover{color:#d8d8d8}
.home-split{display:grid;grid-template-columns:1.5fr 1fr;gap:20px;align-items:start}
.continue-card{padding:26px;display:flex;flex-direction:column;gap:16px}
.continue-card .cc-top{display:flex;align-items:flex-start;gap:16px}
.cc-num{font-family:var(--mono);font-size:12px;color:#bbbbbb;background:rgba(137,137,137,.12);border:1px solid rgba(137,137,137,.25);
  border-radius:9px;padding:6px 9px;line-height:1}
.cc-body h3{margin:0 0 5px;font-size:18px}
.cc-body p{margin:0;color:var(--muted);font-size:12.5px}
.chapter-mini{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:11px;border:1px solid transparent;
  transition:.15s;cursor:pointer}
.chapter-mini:hover{background:rgba(255,255,255,.04);border-color:var(--line)}
.chapter-mini .idx{width:26px;height:26px;border-radius:8px;background:rgba(255,255,255,.055);display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:11.5px;color:var(--muted);flex:none}
.chapter-mini.done .idx{background:rgba(172,172,172,.14);color:#cccccc}
.chapter-mini .cm-t{font-size:13.5px;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.checkin-card{padding:26px;display:flex;flex-direction:column;gap:14px;position:relative;overflow:hidden}
.checkin-card .flame{position:absolute;right:-24px;top:-24px;width:150px;height:150px;border-radius:50%;
  background:radial-gradient(circle,rgba(186,186,186,.16),transparent 65%)}
.checkin-card .streak{font-size:40px;font-weight:700;letter-spacing:-.03em;line-height:1}
.checkin-card .streak small{font-size:13px;color:var(--muted);font-weight:500;margin-left:6px}
.quick-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.quick-card{padding:16px;border-radius:13px;border:1px solid var(--line);background:rgba(255,255,255,.03);
  display:flex;flex-direction:column;gap:8px;transition:.16s;cursor:pointer}
.quick-card:hover{border-color:rgba(137,137,137,.35);background:rgba(137,137,137,.08);transform:translateY(-1px)}
.quick-card b{font-size:13.5px}
.quick-card span{font-size:11.5px;color:var(--muted)}

/* ---------- 学习页 ---------- */
.learn-layout{display:grid;grid-template-columns:282px minmax(0,1fr);gap:26px;align-items:start}
.side-card{position:sticky;top:88px;border:1px solid var(--line);border-radius:18px;background:var(--panel);overflow:hidden;backdrop-filter:blur(16px)}
.side-head{padding:18px 18px 14px;border-bottom:1px solid var(--line)}
.side-head h3{margin:0 0 4px;font-size:14px}
.side-head p{margin:0;font-size:11.5px;color:var(--muted)}
.side-progress{padding:14px 18px;border-bottom:1px solid var(--line)}
.side-progress .bar{height:5px;border-radius:4px;background:rgba(255,255,255,.08);overflow:hidden}
.side-progress .bar i{display:block;height:100%;background:var(--grad-2);border-radius:4px}
.side-progress .sp-lbl{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-bottom:8px}
.chapter-list{padding:8px;max-height:calc(100vh - 280px);overflow:auto}
.chapter-item{display:flex;align-items:center;gap:10px;padding:10px 11px;border-radius:10px;cursor:pointer;transition:.15s}
.chapter-item:hover{background:rgba(255,255,255,.045)}
.chapter-item.active{background:rgba(137,137,137,.12);border:1px solid rgba(137,137,137,.2)}
.chapter-item .num{width:24px;height:24px;border-radius:7px;background:rgba(255,255,255,.05);color:var(--faint);
  font-family:var(--mono);font-size:11px;display:flex;align-items:center;justify-content:center;flex:none}
.chapter-item.done .num{color:#cccccc;background:rgba(172,172,172,.13)}
.chapter-item .ci-t{font-size:13px;line-height:1.4;flex:1}
.chapter-item.done .ci-t{color:var(--text-2)}
.side-foot{padding:12px 18px 16px;border-top:1px solid var(--line)}
.side-foot .btn{width:100%}
.mobile-chapter-btn{display:none}
.learn-main{min-width:0}
.chapter-hero{border:1px solid var(--line);border-radius:20px;background:linear-gradient(140deg,rgba(32,32,32,.85),rgba(16,16,16,.8));
  padding:30px 34px;position:relative;overflow:hidden}
.chapter-hero .ch-meta{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.chapter-hero h1{margin:0 0 6px;font-size:27px;letter-spacing:-.02em}
.chapter-hero .ch-sub{color:var(--muted);font-size:13.5px;margin:0}
.chapter-hero .ch-line{position:absolute;right:34px;top:34px;font-family:var(--mono);font-size:11px;color:var(--faint)}
.doc-body{margin-top:22px;display:flex;flex-direction:column;gap:18px}
.sec{padding:26px 30px;border-radius:16px;border:1px solid var(--line);background:rgba(19,19,19,.6)}
.sec h2{font-size:18px;margin:0 0 14px;letter-spacing:-.01em;display:flex;align-items:center;gap:10px}
.sec h2 .st{width:3px;height:17px;border-radius:2px;background:var(--grad);display:inline-block}
.sec p{margin:0 0 13px;color:var(--text-2);font-size:14px;line-height:1.85}
.sec p:last-child{margin-bottom:0}
.sec strong{color:var(--text);font-weight:600}
.sec code{font-family:var(--mono);font-size:12.5px;background:rgba(137,137,137,.12);color:#d3d3d3;padding:2px 6px;border-radius:5px}
.sec ul,.sec ol{margin:0 0 14px;padding-left:22px;color:var(--text-2);font-size:14px;line-height:1.9}
.sec li{margin-bottom:4px}
.sec table{width:100%;border-collapse:collapse;font-size:12.5px;margin:6px 0 16px;overflow:hidden;border-radius:10px}
.sec th{text-align:left;padding:9px 12px;background:rgba(255,255,255,.05);color:var(--text-2);font-weight:600;border-bottom:1px solid var(--line)}
.sec td{padding:9px 12px;border-bottom:1px solid rgba(255,255,255,.05);color:var(--text-2);vertical-align:top}
.sec tr:last-child td{border-bottom:0}
.codeblock{position:relative;margin:14px 0 18px;border-radius:12px;border:1px solid var(--line-2);background:#0a0a0a;overflow:hidden}
.codeblock .cb-head{display:flex;align-items:center;justify-content:space-between;height:36px;padding:0 12px;
  border-bottom:1px solid var(--line);background:rgba(255,255,255,.025)}
.codeblock .cb-lang{font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.06em}
.copy-btn{display:inline-flex;align-items:center;gap:5px;font-size:11px;color:var(--muted);height:24px;padding:0 8px;border-radius:6px}
.copy-btn:hover{background:rgba(255,255,255,.07);color:var(--text-2)}
.codeblock pre{margin:0;padding:15px 16px;overflow:auto;font-family:var(--mono);font-size:12.5px;line-height:1.85;color:#cfcfcf;
  tab-size:4;max-height:520px}
.codeblock pre code{background:none;color:inherit;padding:0;font-size:inherit}
.tipbox{display:flex;gap:11px;padding:13px 15px;border-radius:11px;background:rgba(172,172,172,.07);
  border:1px solid rgba(172,172,172,.18);color:#d9d9d9;font-size:12.5px;line-height:1.75;margin:4px 0 16px}
.tipbox .ti{flex:none;width:20px;height:20px;border-radius:6px;background:rgba(172,172,172,.16);display:flex;align-items:center;justify-content:center;color:#c8c8c8}
.tipbox .ti svg{width:13px;height:13px}
table.study-table{font-size:12.5px}
.study-table th{white-space:nowrap;background:rgba(137,137,137,.1);color:#d3d3d3}
.tb-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin:8px 0 18px}
.tb-wrap table{margin:0}
.table-caption{font-size:12px;color:var(--faint)}
.chapter-foot{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:22px 4px 8px;flex-wrap:wrap}
.chapter-foot .btn{min-width:120px}
.chapter-nav{display:flex;gap:10px}

/* ---------- 练习 ---------- */
.practice-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start}
.ex-side{position:sticky;top:88px;border:1px solid var(--line);border-radius:18px;background:var(--panel);backdrop-filter:blur(16px);overflow:hidden}
.ex-list{padding:8px;max-height:calc(100vh - 160px);overflow:auto}
.ex-chapter{padding:9px 11px;border-radius:9px;display:flex;align-items:center;gap:9px;cursor:pointer;transition:.15s}
.ex-chapter:hover{background:rgba(255,255,255,.045)}
.ex-chapter.active{background:rgba(137,137,137,.1)}
.ex-chapter .ec-t{font-size:12.5px;flex:1;line-height:1.4}
.ex-chapter .ec-n{font-family:var(--mono);font-size:10.5px;color:var(--faint)}
.ex-chapter .ec-n.all{color:#cccccc}
.practice-main{min-width:0;display:flex;flex-direction:column;gap:18px}
.practice-head{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.practice-head h1{margin:0;font-size:22px;letter-spacing:-.01em}
.practice-head .ph-sub{color:var(--muted);font-size:12.5px;margin-top:2px}
.ex-cards{display:grid;gap:12px}
.ex-card{display:flex;align-items:center;gap:16px;padding:18px 20px;border-radius:14px;border:1px solid var(--line);
  background:rgba(19,19,19,.62);cursor:pointer;transition:.16s}
.ex-card:hover{border-color:rgba(137,137,137,.35);background:rgba(137,137,137,.07);transform:translateY(-1px)}
.ex-card .ec-idx{width:38px;height:38px;border-radius:11px;background:rgba(255,255,255,.05);display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:12px;color:var(--muted);flex:none}
.ex-card.passed .ec-idx{background:rgba(172,172,172,.14);color:#cccccc}
.ex-card .ec-main{flex:1;min-width:0}
.ex-card h3{margin:0 0 4px;font-size:15px;display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.ex-card p{margin:0;color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ex-card .ec-arr{color:var(--faint);flex:none}
.workspace{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:18px;align-items:start}
.q-panel{padding:24px 26px;position:sticky;top:88px}
.q-title{margin:0 0 6px;font-size:19px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.q-desc{color:var(--text-2);font-size:13.5px;line-height:1.8;margin:12px 0 16px}
.q-spec{display:grid;gap:9px;margin-bottom:16px}
.spec-row{display:flex;gap:10px;font-size:12.5px;line-height:1.7}
.spec-row .k{color:var(--faint);width:52px;flex:none;padding-top:1px}
.spec-row .v{color:var(--text-2);flex:1;white-space:pre-wrap}
.q-sample{margin-top:6px}
.mono-box{font-family:var(--mono);font-size:12px;background:rgba(8,8,8,.7);border:1px solid var(--line);border-radius:9px;
  padding:11px 13px;color:#c7c7c7;white-space:pre-wrap;overflow:auto;max-height:170px;margin-top:7px}
.sample-label{font-size:11px;color:var(--faint);letter-spacing:.05em}
.editor-panel{display:flex;flex-direction:column;gap:12px;min-width:0}
.editor-card{border:1px solid var(--line-2);border-radius:14px;overflow:hidden;background:#0a0a0a;box-shadow:var(--shadow-sm)}
.editor-head{display:flex;align-items:center;gap:10px;height:44px;padding:0 12px 0 14px;border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.03)}
.editor-head .dots{display:flex;gap:6px;margin-right:4px}
.editor-head .dots i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.14)}
.editor-head .fname{font-family:var(--mono);font-size:11.5px;color:var(--faint);flex:1}
.editor-wrap{position:relative;display:flex;background:#0a0a0a}
.gutter{flex:none;padding:14px 8px 14px 12px;font-family:var(--mono);font-size:12.5px;line-height:1.7;color:#414141;
  text-align:right;user-select:none;background:rgba(255,255,255,.015);border-right:1px solid rgba(255,255,255,.04);min-width:40px}
.code-input{flex:1;min-height:380px;border:0;outline:none;resize:vertical;background:transparent;color:#d4d4d4;
  font-family:var(--mono);font-size:12.5px;line-height:1.7;padding:14px 14px;tab-size:4;white-space:pre;overflow:auto}
.editor-foot{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.editor-foot .hint-text{font-size:11.5px;color:var(--faint);margin-left:auto}
.console{border:1px solid var(--line);border-radius:12px;background:rgba(9,9,9,.8);overflow:hidden}
.console-head{display:flex;align-items:center;gap:9px;height:36px;padding:0 13px;border-bottom:1px solid var(--line);
  font-size:11.5px;color:var(--muted)}
.console-body{padding:13px;min-height:70px;max-height:340px;overflow:auto;font-family:var(--mono);font-size:12px;
  line-height:1.75;white-space:pre-wrap;color:#bebebe}
.console-body.err{color:#b0b0b0}
.res-item{padding:9px 0;border-bottom:1px dashed rgba(255,255,255,.07);font-family:var(--sans);font-size:12.5px}
.res-item:last-child{border-bottom:0}
.res-line{display:flex;align-items:center;gap:8px;font-weight:600}
.res-line .badge{width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:10px;flex:none}
.badge.ok{background:rgba(172,172,172,.16);color:#cccccc;border:1px solid rgba(172,172,172,.3)}
.badge.no{background:rgba(140,140,140,.14);color:#b0b0b0;border:1px solid rgba(140,140,140,.28)}
.res-detail{margin:8px 0 0;display:grid;gap:6px}
.res-detail .rd{display:grid;grid-template-columns:56px 1fr;gap:8px;font-size:11.5px}
.res-detail .rd .k{color:var(--faint)}
.res-detail .rd .v{font-family:var(--mono);color:#c7c7c7;white-space:pre-wrap;word-break:break-word}
.ex-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:2px}
.ex-nav .btn{min-width:90px}
.hint-box{padding:13px 15px;border-radius:11px;background:rgba(186,186,186,.07);border:1px solid rgba(186,186,186,.18);
  color:#d5d5d5;font-size:12.5px;line-height:1.7}
.hint-box b{color:#d9d9d9}

/* ---------- AI ---------- */
.ai-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start;max-width:1160px;margin:0 auto}
.ai-aside{position:sticky;top:88px;display:flex;flex-direction:column;gap:14px}
.ai-aside .card{padding:20px}
.ai-aside h3{margin:0 0 10px;font-size:14px}
.ai-aside p{margin:0;color:var(--muted);font-size:12px;line-height:1.7}
.cap-list{display:grid;gap:10px;margin-top:14px}
.cap{display:flex;gap:10px;align-items:flex-start;font-size:12px;color:var(--text-2);line-height:1.6}
.cap .ci{width:24px;height:24px;border-radius:7px;background:rgba(137,137,137,.12);color:#bbbbbb;display:flex;align-items:center;justify-content:center;flex:none}
.cap .ci svg{width:13px;height:13px}
.chat-card{display:flex;flex-direction:column;height:calc(100vh - 190px);min-height:520px;overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line);flex:none}
.chat-head .ai-dot{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,rgba(137,137,137,.28),rgba(172,172,172,.18));
  border:1px solid rgba(158,158,158,.28);display:flex;align-items:center;justify-content:center;color:#d1d1d1}
.chat-head b{font-size:14px;display:block}
.chat-head span{font-size:11px;color:var(--muted)}
.chat-scroll{flex:1;overflow:auto;padding:22px 22px 8px;display:flex;flex-direction:column;gap:18px}
.msg{display:flex;gap:11px;max-width:88%}
.msg.me{align-self:flex-end;flex-direction:row-reverse}
.msg .m-avatar{width:30px;height:30px;border-radius:9px;flex:none;display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;background:rgba(255,255,255,.06);border:1px solid var(--line);color:var(--text-2)}
.msg.ai .m-avatar{background:rgba(137,137,137,.15);border-color:rgba(137,137,137,.25);color:#d1d1d1}
.msg .bubble{padding:13px 16px;border-radius:14px;font-size:13.5px;line-height:1.8;color:var(--text-2);
  border:1px solid var(--line);background:rgba(255,255,255,.035)}
.msg.me .bubble{background:rgba(137,137,137,.14);border-color:rgba(137,137,137,.24);color:#e7e7e7;border-bottom-right-radius:4px}
.msg.ai .bubble{border-bottom-left-radius:4px;max-width:100%}
.bubble .refs{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px;padding-top:9px;border-top:1px solid rgba(255,255,255,.07)}
.ref-chip{display:inline-flex;align-items:center;gap:5px;height:26px;padding:0 9px;border-radius:7px;font-size:11.5px;
  background:rgba(137,137,137,.1);border:1px solid rgba(137,137,137,.22);color:#c4c4c4;cursor:pointer}
.ref-chip:hover{background:rgba(137,137,137,.18)}
.chat-empty{display:flex;flex-direction:column;align-items:center;gap:16px;padding:34px 10px;text-align:center}
.chat-empty .ce-ico{width:52px;height:52px;border-radius:15px;background:rgba(137,137,137,.13);border:1px solid rgba(137,137,137,.24);
  display:flex;align-items:center;justify-content:center;color:#d1d1d1}
.chat-empty h3{margin:0;font-size:16px}
.chat-empty p{margin:0;color:var(--muted);font-size:12.5px;max-width:420px}
.sugg{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;max-width:560px}
.sugg button{height:32px;padding:0 12px;border-radius:9px;font-size:12px;color:var(--text-2);
  border:1px solid var(--line-2);background:rgba(255,255,255,.035)}
.sugg button:hover{border-color:rgba(137,137,137,.4);color:#d8d8d8;background:rgba(137,137,137,.1)}
.chat-input-wrap{flex:none;padding:14px 18px 18px;border-top:1px solid var(--line);background:rgba(13,13,13,.6)}
.chat-input{display:flex;align-items:flex-end;gap:10px;border:1px solid var(--line-2);border-radius:14px;
  background:rgba(255,255,255,.035);padding:8px 8px 8px 14px;transition:.16s}
.chat-input:focus-within{border-color:rgba(137,137,137,.5);box-shadow:0 0 0 3px rgba(137,137,137,.1)}
.chat-input textarea{flex:1;border:0;outline:none;background:transparent;resize:none;font-size:13.5px;line-height:1.6;
  max-height:120px;min-height:26px;padding:6px 0;color:var(--text)}
.chat-input textarea::placeholder{color:#636363}
.send-btn{width:38px;height:38px;border-radius:10px;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#0f0f0f;flex:none}
.send-btn:disabled{opacity:.5}
.typing{display:inline-flex;gap:4px;align-items:center}
.typing i{width:5px;height:5px;border-radius:50%;background:#a4a4a4;animation:blink 1.1s infinite}
.typing i:nth-child(2){animation-delay:.18s}
.typing i:nth-child(3){animation-delay:.36s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}

/* ---------- 个人中心 ---------- */
.me-head{display:flex;align-items:center;gap:22px;padding:28px 30px;border-radius:20px;border:1px solid var(--line-2);
  background:linear-gradient(135deg,rgba(34,34,34,.9),rgba(17,17,17,.85));flex-wrap:wrap}
.me-id{flex:1;min-width:200px}
.me-id h1{margin:0 0 4px;font-size:23px;letter-spacing:-.01em;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.me-id .me-sub{color:var(--muted);font-size:12.5px}
.me-bio{color:var(--text-2);font-size:12.5px;margin-top:8px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.bio-edit{font-size:11.5px;color:#bbbbbb;cursor:pointer}
.me-actions{display:flex;gap:10px;flex-wrap:wrap}
.tabs{display:flex;gap:4px;padding:5px;border-radius:12px;background:rgba(255,255,255,.035);border:1px solid var(--line);
  width:fit-content;max-width:100%;overflow-x:auto;margin:22px 0 18px}
.tab{height:34px;padding:0 15px;border-radius:8px;font-size:12.5px;color:var(--muted);white-space:nowrap;transition:.16s}
.tab.active{background:rgba(255,255,255,.1);color:var(--text);box-shadow:0 2px 8px rgba(0,0,0,.25)}
.me-panel{min-height:300px}
.two-col{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
.progress-list{display:grid;gap:6px}
.pg-row{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:10px;cursor:pointer;transition:.15s}
.pg-row:hover{background:rgba(255,255,255,.045)}
.pg-row .pg-n{font-family:var(--mono);font-size:11px;color:var(--faint);width:22px;flex:none}
.pg-row .pg-t{flex:1;font-size:13px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pg-row .pg-s{font-size:11px;flex:none}
.pg-row .pg-s.ok{color:#cccccc}
.wrong-item{display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:11px;border:1px solid var(--line);
  background:rgba(255,255,255,.025);margin-bottom:8px;cursor:pointer;transition:.15s}
.wrong-item:hover{border-color:rgba(140,140,140,.3);background:rgba(140,140,140,.06)}
.wrong-item .wi-main{flex:1;min-width:0}
.wrong-item h4{margin:0 0 3px;font-size:13.5px}
.wrong-item p{margin:0;font-size:11.5px;color:var(--muted)}
.empty-state{padding:44px 20px;text-align:center;color:var(--muted);font-size:13px}
.empty-state .es-ico{width:52px;height:52px;border-radius:15px;background:rgba(255,255,255,.04);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;margin:0 auto 14px;color:var(--faint)}
.empty-state b{display:block;color:var(--text-2);margin-bottom:4px}
.doc-card{display:flex;align-items:center;gap:18px;padding:24px;border-radius:16px;border:1px solid var(--line-2);
  background:linear-gradient(135deg,rgba(41,41,41,.7),rgba(19,19,19,.7));cursor:pointer;transition:.16s}
.doc-card:hover{border-color:rgba(137,137,137,.4);transform:translateY(-1px)}
.doc-ico{width:52px;height:52px;border-radius:13px;background:rgba(137,137,137,.14);border:1px solid rgba(137,137,137,.24);
  display:flex;align-items:center;justify-content:center;color:#d1d1d1;flex:none}
.doc-card h3{margin:0 0 4px;font-size:16px}
.doc-card p{margin:0;color:var(--muted);font-size:12px}
.doc-meta{display:flex;gap:14px;margin-top:8px;font-size:11px;color:var(--faint);flex-wrap:wrap}
.form-grid{display:grid;gap:14px;max-width:460px}
.settings-card{padding:24px}
.settings-card h3{margin:0 0 4px;font-size:15px}
.settings-card .sc-sub{color:var(--muted);font-size:12px;margin:0 0 18px}
.list-card{padding:22px}

/* ---------- 资料阅读器 ---------- */
.doc-viewer{max-width:860px;margin:0 auto}
.doc-toolbar{display:flex;align-items:center;gap:12px;justify-content:space-between;padding:16px 20px;border-radius:14px;
  border:1px solid var(--line);background:var(--panel);position:sticky;top:78px;z-index:10;backdrop-filter:blur(18px);flex-wrap:wrap}
.doc-toolbar .dt-l{display:flex;align-items:center;gap:10px;min-width:0}
.doc-toolbar b{font-size:14px}
.doc-toolbar span{font-size:11.5px;color:var(--muted)}
.doc-content{margin-top:18px;padding:38px 44px;border-radius:18px;border:1px solid var(--line);
  background:rgba(18,18,18,.8);line-height:1.9}
.doc-content .doc-title{font-size:27px;margin:0 0 8px;text-align:center}
.doc-content .doc-subtitle{text-align:center;color:var(--muted);font-size:12.5px;margin:0 0 28px}
.doc-content .doc-h2{font-size:20px;margin:34px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.doc-content .doc-h3{font-size:16px;margin:24px 0 10px;color:#d5d5d5}
.doc-content p{margin:0 0 12px;color:var(--text-2);font-size:13.5px}
.doc-content pre.code{margin:12px 0 16px;padding:15px 17px;border-radius:11px;background:#0a0a0a;border:1px solid var(--line);
  overflow:auto;font-family:var(--mono);font-size:12px;line-height:1.8;color:#cfcfcf}
.doc-content table{border-collapse:collapse;width:100%;font-size:12px;margin:10px 0 18px}
.doc-content th,.doc-content td{border:1px solid var(--line);padding:8px 10px;color:var(--text-2);text-align:left}
.doc-content th{background:rgba(137,137,137,.1);color:#d3d3d3}
.doc-content .table-caption{font-size:11.5px;color:var(--faint);margin:16px 0 4px}

/* ---------- 管理端 ---------- */
.admin-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.admin-head h1{margin:0;font-size:24px;letter-spacing:-.01em}
.admin-head p{margin:4px 0 0;color:var(--muted);font-size:12.5px}
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.kpi{padding:18px 20px;border-radius:15px;border:1px solid var(--line);background:var(--panel);position:relative;overflow:hidden}
.kpi .k-lbl{font-size:11.5px;color:var(--muted);display:flex;align-items:center;gap:7px;margin-bottom:9px}
.kpi .k-val{font-size:28px;font-weight:700;letter-spacing:-.02em;line-height:1.1}
.kpi .k-sub{font-size:11px;color:var(--faint);margin-top:5px}
.kpi .k-val em{font-size:12px;font-style:normal;color:var(--muted);font-weight:500;margin-left:3px}
.admin-grid{display:grid;grid-template-columns:1.55fr 1fr;gap:16px;margin-top:16px;align-items:start}
.chart-card{padding:20px 22px}
.chart-card h3{margin:0 0 2px;font-size:14px}
.chart-card .cc-sub{font-size:11.5px;color:var(--muted);margin:0 0 14px}
.legend{display:flex;gap:14px;font-size:11px;color:var(--muted);flex-wrap:wrap}
.legend i{width:8px;height:8px;border-radius:2px;display:inline-block;margin-right:5px}
#act-chart{width:100%;height:190px;display:block}
.bar-list{display:grid;gap:9px;max-height:290px;overflow:auto}
.bar-row{display:grid;grid-template-columns:96px 1fr 40px;gap:10px;align-items:center;font-size:11.5px}
.bar-row .bl{color:var(--text-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bar-row .bt{height:7px;border-radius:4px;background:rgba(255,255,255,.06);overflow:hidden}
.bar-row .bt i{display:block;height:100%;border-radius:4px;background:linear-gradient(90deg,#7b7b7b,#acacac)}
.bar-row .bv{color:var(--muted);text-align:right;font-family:var(--mono);font-size:10.5px}
.table-wrap{border:1px solid var(--line);border-radius:14px;overflow:auto;background:rgba(18,18,18,.6)}
table.data{width:100%;border-collapse:collapse;font-size:12.5px;min-width:760px}
table.data th{text-align:left;padding:12px 14px;color:var(--faint);font-weight:600;font-size:11px;letter-spacing:.04em;
  border-bottom:1px solid var(--line);background:rgba(255,255,255,.02);white-space:nowrap}
table.data td{padding:12px 14px;border-bottom:1px solid rgba(255,255,255,.045);color:var(--text-2);vertical-align:middle}
table.data tr:last-child td{border-bottom:0}
table.data tr:hover td{background:rgba(255,255,255,.025)}
.u-cell{display:flex;align-items:center;gap:9px}
.u-cell .nm{color:var(--text);font-weight:600}
.mini-progress{width:74px;height:5px;border-radius:3px;background:rgba(255,255,255,.08);overflow:hidden;display:inline-block;vertical-align:middle;margin-right:7px}
.mini-progress i{display:block;height:100%;background:var(--grad-2)}
.dot{width:7px;height:7px;border-radius:50%;display:inline-block;background:var(--faint);margin-right:6px}
.dot.on{background:#acacac;box-shadow:0 0 0 3px rgba(172,172,172,.16)}
.search-box{display:flex;align-items:center;gap:8px;height:38px;padding:0 12px;border-radius:10px;border:1px solid var(--line-2);
  background:rgba(255,255,255,.035);min-width:220px}
.search-box input{border:0;outline:none;background:transparent;font-size:12.5px;width:100%}
.search-box svg{width:15px;height:15px;color:var(--faint);flex:none}
.act-feed{display:grid;gap:2px;max-height:330px;overflow:auto}
.act-item{display:flex;gap:10px;padding:9px 6px;font-size:11.5px;border-radius:8px;align-items:flex-start}
.act-item:hover{background:rgba(255,255,255,.03)}
.act-item .ai-dot{width:6px;height:6px;border-radius:50%;background:rgba(137,137,137,.8);margin-top:6px;flex:none}
.act-item .ai-txt{flex:1;min-width:0;color:var(--text-2);line-height:1.55}
.act-item .ai-txt b{color:var(--text);font-weight:600}
.act-item .ai-time{color:var(--faint);font-size:10.5px;flex:none}

/* ---------- 弹窗 / 提示 ---------- */
.modal-root{position:fixed;inset:0;z-index:90;display:none;align-items:center;justify-content:center;padding:20px}
.modal-root.open{display:flex}
.modal-mask{position:absolute;inset:0;background:rgba(6,6,6,.72);backdrop-filter:blur(6px)}
.modal{position:relative;width:min(560px,100%);max-height:88vh;overflow:auto;border-radius:18px;
  border:1px solid var(--line-2);background:rgba(20,20,20,.97);box-shadow:var(--shadow);padding:26px 28px;animation:pop .2s ease}
@keyframes pop{from{opacity:0;transform:translateY(10px) scale(.985)}to{opacity:1;transform:none}}
.modal h3{margin:0 0 6px;font-size:18px}
.modal .m-sub{color:var(--muted);font-size:12.5px;margin:0 0 18px;line-height:1.6}
.modal-close{position:absolute;right:14px;top:14px;width:32px;height:32px;border-radius:8px;color:var(--faint);
  display:flex;align-items:center;justify-content:center}
.modal-close:hover{background:rgba(255,255,255,.07);color:var(--text)}
.modal-close svg{width:16px;height:16px}
.modal-foot{display:flex;gap:10px;justify-content:flex-end;margin-top:20px;flex-wrap:wrap}
.temp-pw{font-family:var(--mono);font-size:19px;letter-spacing:.06em;color:#e2e2e2;background:rgba(186,186,186,.08);
  border:1px solid rgba(186,186,186,.24);border-radius:11px;padding:14px 16px;text-align:center;margin:6px 0 4px;user-select:all}
.modal .kv{display:grid;gap:10px;margin:14px 0}
.modal .kv-row{display:flex;gap:12px;font-size:12.5px}
.modal .kv-row .k{color:var(--faint);width:76px;flex:none}
.modal .kv-row .v{color:var(--text-2);flex:1}
.toast-root{position:fixed;left:50%;bottom:32px;transform:translateX(-50%);z-index:120;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{display:flex;align-items:center;gap:9px;padding:11px 16px;border-radius:11px;background:rgba(25,25,25,.96);
  border:1px solid var(--line-2);box-shadow:var(--shadow);font-size:13px;color:var(--text);animation:toastIn .22s ease;backdrop-filter:blur(14px)}
.toast.ok{border-color:rgba(172,172,172,.4)}
.toast.err{border-color:rgba(140,140,140,.4)}
.toast .t-ico{width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:10px;flex:none}
.toast.ok .t-ico{background:rgba(172,172,172,.18);color:#cccccc}
.toast.err .t-ico{background:rgba(140,140,140,.16);color:#b0b0b0}
@keyframes toastIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* ---------- 代码高亮 / 图解 ---------- */
.c-kw{color:#ababab}
.c-str{color:#cecece}
.c-com{color:#696969;font-style:italic}
.c-num{color:#c5c5c5}
.c-pre{color:#aaaaaa}
.viz{margin:16px 0;padding:12px 10px 8px;border:1px solid var(--line);border-radius:13px;background:rgba(10,10,10,.55);overflow:hidden}
.viz svg{max-width:100%}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .login-shell{grid-template-columns:1fr;gap:34px;max-width:480px}
  .login-brand{display:none}
  .top-nav{gap:0}
  .nav-item{padding:0 11px;font-size:12.5px}
  .view{padding:26px 22px 56px}
  .workspace{grid-template-columns:minmax(0,1fr)}
  .q-panel{position:static}
  .ai-layout{grid-template-columns:minmax(0,1fr)}
  .ai-aside{position:static;display:none}
}
@media (max-width:960px){
  .topbar{padding:0 18px;gap:14px}
  .brand-text small{display:none}
  .top-nav{display:none}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:50;height:62px;
    padding:0 6px calc(4px + env(safe-area-inset-bottom));background:rgba(12,12,12,.92);backdrop-filter:blur(20px);
    border-top:1px solid var(--line)}
  .tab-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
    font-size:10px;color:var(--muted);border-radius:10px;position:relative}
  .tab-btn .icon{width:20px;height:20px}
  .tab-btn.active{color:#d3d3d3}
  .tab-btn.active::before{content:"";position:absolute;top:0;width:20px;height:2px;border-radius:2px;background:var(--grad)}
  .tabbar-space{height:72px}
  .view{padding:20px 18px 30px}
  .hero{grid-template-columns:1fr;padding:28px 24px;gap:22px}
  .hero h1{font-size:24px}
  .ring-wrap{margin:4px auto 0;width:112px;height:112px}
  .g-4{grid-template-columns:repeat(2,1fr)}
  .g-3{grid-template-columns:1fr 1fr}
  .home-split{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .learn-layout,.practice-layout{grid-template-columns:1fr;gap:16px}
  .side-card,.ex-side{position:static;display:none}
  .side-card.mobile-open,.ex-side.mobile-open{display:block}
  .mobile-chapter-btn{display:inline-flex}
  .chapter-list,.ex-list{max-height:none}
  .chapter-hero{padding:22px}
  .chapter-hero .ch-line{display:none}
  .sec{padding:20px 18px}
  .codeblock pre{font-size:11.5px;max-height:none}
  .sec table{font-size:11.5px}
  .workspace{gap:14px}
  .q-panel{padding:20px 18px}
  .chat-card{height:calc(100vh - 150px);min-height:460px}
  .me-head{padding:22px;gap:16px}
  .avatar.lg{width:62px;height:62px;font-size:21px;border-radius:18px}
  .me-id h1{font-size:19px}
  .doc-content{padding:24px 18px}
  .kpi-grid{grid-template-columns:1fr 1fr}
  .admin-grid{grid-template-columns:1fr}
  .doc-toolbar{top:74px}
  .chat-scroll{padding:16px 14px 6px}
  .msg{max-width:96%}
}
@media (max-width:640px){
  .login-wrap{padding:24px 16px}
  .login-card{padding:24px 20px;border-radius:18px}
  .login-brand h1{font-size:30px}
  .code-window{display:none}
  .hero h1{font-size:22px}
  .hero .hero-meta{gap:10px}
  .section-head{margin:26px 0 12px}
  .quick-grid{grid-template-columns:1fr}
  .me-head{gap:14px}
  .me-actions{width:100%;justify-content:flex-start}
  .tabs{width:100%}
  .doc-toolbar .dt-l b{font-size:13px}
  .kpi .k-val{font-size:23px}
  .modal{padding:22px 18px;max-height:92vh}
  .toast-root{bottom:80px;width:calc(100% - 32px)}
  .toast{max-width:100%}
  .chapter-foot{justify-content:center}
  .editor-foot .hint-text{display:none}
  .chat-head{padding:12px 16px}
  .chat-input-wrap{padding:10px 12px 12px}
}

/* ===================== 黑白单色主题 · 最终微调 ===================== */
:root{
  --bg:#000;
  --bg-2:#060606;
  --panel:rgba(255,255,255,.042);
  --panel-solid:#0C0C0C;
  --panel-2:rgba(255,255,255,.028);
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.17);
  --text:#F6F6F6;
  --text-2:#C6C6C6;
  --muted:#8B8B8B;
  --faint:#5E5E5E;
  --acc:#FFFFFF;
  --acc-soft:rgba(255,255,255,.10);
  --acc-2:#D4D4D4;
  --gold:#DDDDDD;
  --danger:#E6E6E6;
  --grad:linear-gradient(135deg,#FFFFFF 0%,#C6C6C6 100%);
  --grad-2:linear-gradient(135deg,#F0F0F0 0%,#9C9C9C 100%);
}
.bg-layer{
  background:
    radial-gradient(1200px 600px at 12% -10%,rgba(255,255,255,.075),transparent 60%),
    radial-gradient(900px 500px at 88% 0%,rgba(255,255,255,.045),transparent 60%),
    linear-gradient(180deg,#000 0%,#050505 40%,#000 100%);
}
.bg-glow{opacity:.20}
.g1{background:rgba(255,255,255,.17)}
.g2{background:rgba(255,255,255,.10)}
.g3{background:rgba(255,255,255,.07)}
.hero{background:linear-gradient(120deg,#151515,#090909 55%,#111)}
.chapter-hero{background:linear-gradient(140deg,#151515,#080808)}
.me-head{background:linear-gradient(135deg,#161616,#090909)}
.settings-card,.doc-card{background:linear-gradient(135deg,#161616,#0B0B0B)}
.card{box-shadow:0 10px 30px rgba(0,0,0,.35)}
.btn.primary{color:#0A0A0A;box-shadow:0 8px 24px rgba(0,0,0,.5)}
.btn.primary:hover{filter:brightness(1.08)}
.avatar{background:linear-gradient(145deg,#4E4E4E,#262626);color:#FFF;border-color:rgba(255,255,255,.18)}
.avatar.admin{background:linear-gradient(145deg,#6F6F6F,#3A3A3A);color:#FFF;border-color:rgba(255,255,255,.32)}
.avatar img{filter:grayscale(1) contrast(1.04)}
.brand-mark{background:linear-gradient(150deg,rgba(255,255,255,.16),rgba(255,255,255,.05));border-color:rgba(255,255,255,.30);color:#FFF}
.tag.acc{background:rgba(255,255,255,.11);color:#FFF;border-color:rgba(255,255,255,.34)}
.tag.green{background:rgba(255,255,255,.08);color:#F0F0F0;border-color:rgba(255,255,255,.26)}
.tag.gold{background:rgba(255,255,255,.06);color:#E8E8E8;border-color:rgba(255,255,255,.22)}
.tag.red{background:rgba(255,255,255,.04);color:#A8A8A8;border-color:rgba(255,255,255,.14)}
.tag{background:rgba(255,255,255,.055);color:#BEBEBE}
.stat-card.acc .val{color:#FFF}
.stat-card.green .val{color:#EDEDED}
.stat-card.gold .val{color:#D6D6D6}
.chapter-mini.done .idx,.ex-card.passed .ec-idx{background:rgba(255,255,255,.14);color:#FFF}
.chapter-item.done .num,.pg-row .pg-s.ok{color:#F0F0F0}
.pw-rule li.ok{color:#EDEDED}
.pw-rule li.ok i{background:#FFF}
.pw-rule li.ok i::after{border-color:#000}
.side-progress .bar i,.stat-card .bar i,.mini-progress i{background:linear-gradient(90deg,#FFF,#A8A8A8)}
.bar-row .bt i{background:linear-gradient(90deg,#FFF,#B0B0B0)}
.login-card{background:rgba(17,17,17,.86);border-color:rgba(255,255,255,.13)}
.code-window{background:#050505}
.code-window .ln{color:#3C3C3C}
.cw-bar i{background:rgba(255,255,255,.22)}
.code-window pre{color:#C9C9C9}
.codeblock .cb-lang{color:#787878}
.c-kw{color:#F2F2F2;font-weight:600}
.c-str{color:#CFCFCF}
.c-com{color:#6E6E6E;font-style:italic}
.c-num{color:#E2E2E2}
.c-pre{color:#BDBDBD}
.sec code{background:rgba(255,255,255,.10);color:#F2F2F2}
.sec th{background:rgba(255,255,255,.07);color:#E6E6E6}
.study-table th{background:rgba(255,255,255,.09);color:#F2F2F2}
.tipbox{background:rgba(255,255,255,.055);border-color:rgba(255,255,255,.16);color:#DEDEDE}
.tipbox .ti{background:rgba(255,255,255,.10);color:#FFF}
.hint-box{background:rgba(255,255,255,.055);border-color:rgba(255,255,255,.16);color:#DEDEDE}
.hint-box b{color:#FFF}
.badge.ok{background:rgba(255,255,255,.15);color:#FFF;border-color:rgba(255,255,255,.30)}
.badge.no{background:rgba(255,255,255,.05);color:#A8A8A8;border-color:rgba(255,255,255,.18)}
.toast.ok{border-color:rgba(255,255,255,.30)}
.toast.err{border-color:rgba(255,255,255,.44)}
.toast.ok .t-ico{background:rgba(255,255,255,.16);color:#FFF}
.toast.err .t-ico{background:rgba(255,255,255,.06);color:#CFCFCF}
.form-error{color:#EDEDED}
.chart-card h3,.doc-toolbar b{color:#F6F6F6}
.admin-head h1{color:#FFF}
.dot.on{background:#FFF;box-shadow:0 0 0 3px rgba(255,255,255,.18)}
.doc-content th{background:rgba(255,255,255,.10);color:#F2F2F2}
.doc-content pre.code{background:#050505}
.modal{background:rgba(14,14,14,.97)}
.temp-pw{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.30);color:#FFF}
.chat-empty .ce-ico,.ai-dot,.chat-head .ai-dot,.cap .ci{background:rgba(255,255,255,.10);border-color:rgba(255,255,255,.22);color:#FFF}
.msg.ai .m-avatar{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.24);color:#FFF}
.msg.me .bubble{background:rgba(255,255,255,.13);border-color:rgba(255,255,255,.24);color:#FFF}
.ref-chip{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.20);color:#EDEDED}
.ref-chip:hover{background:rgba(255,255,255,.14)}
.send-btn{color:#0A0A0A}
.nav-item.active{background:rgba(255,255,255,.10);border-color:rgba(255,255,255,.22)}
.nav-item.active .icon{color:#FFF}
.tabbar{background:rgba(4,4,4,.94)}
.tab-btn.active{color:#FFF}
.hero::after{background:radial-gradient(circle,rgba(255,255,255,.13),transparent 66%)}
.hero::before{background:radial-gradient(circle,rgba(255,255,255,.06),transparent 70%)}
.ring-wrap .ring-val b{color:#FFF}

/* 指定用户（mjy）的头像保留原有颜色 */
.avatar img[src*="mjy-avatar"]{filter:none}