/* ============================================================
   高中学习台 · 设计系统
   ============================================================ */
:root{
  --bg:#0a0f1e;
  --bg-soft:#0e1527;
  --sidebar:#0c1222;
  --card:#121a30;
  --card-2:#182241;
  --card-3:#1e2a4d;
  --line:#243052;
  --line-soft:#1b2440;
  --text:#e9edf9;
  --text-2:#aab6d4;
  --muted:#7583a6;
  --accent:#6f8dff;
  --accent-2:#3ddc97;
  --accent-3:#ffb454;
  --danger:#ff6b81;
  --purple:#b98cff;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --shadow-sm:0 2px 10px rgba(0,0,0,.25);
  --r:14px;
  --r-sm:10px;
  --sidebar-w:246px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --mono:"JetBrains Mono",Consolas,"Courier New",monospace;
}
html[data-theme="light"]{
  --bg:#f2f5fc;
  --bg-soft:#e9eefa;
  --sidebar:#ffffff;
  --card:#ffffff;
  --card-2:#f5f8ff;
  --card-3:#eaeffb;
  --line:#dfe6f5;
  --line-soft:#e9eef9;
  --text:#101a30;
  --text-2:#41506f;
  --muted:#7183a3;
  --shadow:0 10px 30px rgba(23,42,84,.10);
  --shadow-sm:0 2px 10px rgba(23,42,84,.07);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;font-family:var(--font);
  background:radial-gradient(1200px 700px at 80% -10%, rgba(111,141,255,.16), transparent 60%),
             radial-gradient(900px 600px at -10% 100%, rgba(61,220,151,.10), transparent 55%),
             var(--bg);
  color:var(--text);font-size:14px;line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow:hidden;
}
h1,h2,h3,h4{margin:0;font-weight:650;letter-spacing:.2px}
p{margin:0}
button{font-family:inherit;color:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px;color:inherit}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--line);border-radius:20px;border:3px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:var(--muted);background-clip:content-box}
::-webkit-scrollbar-track{background:transparent}

/* ---------------- 布局 ---------------- */
#app{display:grid;grid-template-columns:var(--sidebar-w) 1fr;height:100vh}

.sidebar{
  background:var(--sidebar);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  padding:18px 14px 14px;
  gap:14px;z-index:30;
}
.brand{display:flex;align-items:center;gap:10px;padding:2px 6px 12px}
.brand .logo{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;font-size:19px;
  background:linear-gradient(135deg,var(--accent),var(--purple));
  box-shadow:0 6px 18px rgba(111,141,255,.35);
}
.brand b{display:block;font-size:15px}
.brand small{color:var(--muted);font-size:11px;letter-spacing:1.4px;text-transform:uppercase}

.nav{display:flex;flex-direction:column;gap:3px;overflow-y:auto;flex:1;padding-right:2px}
.nav button{
  display:flex;align-items:center;gap:10px;
  border:0;background:transparent;color:var(--text-2);
  padding:9px 11px;border-radius:10px;font-size:13.5px;text-align:left;width:100%;
  transition:background .15s,color .15s,transform .1s;
}
.nav button .ic{font-size:15px;width:18px;text-align:center;filter:saturate(.9)}
.nav button:hover{background:var(--card-2);color:var(--text)}
.nav button.active{
  background:linear-gradient(90deg,rgba(111,141,255,.20),rgba(111,141,255,.05));
  color:var(--text);box-shadow:inset 0 0 0 1px rgba(111,141,255,.30);
}
.nav button.active .ic{filter:none}
.nav .nav-sep{margin:8px 6px 4px;font-size:10.5px;letter-spacing:1.6px;color:var(--muted);text-transform:uppercase}

.side-foot{display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--line-soft);padding-top:10px}
.streak{
  display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-2);
  background:var(--card-2);border:1px solid var(--line-soft);border-radius:10px;padding:8px 10px;
}
.streak b{color:var(--accent-3);font-size:15px}

.main{display:flex;flex-direction:column;min-width:0;height:100vh}
.topbar{
  display:flex;align-items:center;gap:14px;
  padding:16px 26px 12px;border-bottom:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(255,255,255,.02),transparent);
}
.topbar h1{font-size:19px}
.topbar .sub{color:var(--muted);font-size:12px;margin-top:2px}
.top-actions{margin-left:auto;display:flex;gap:8px;align-items:center}
.view-root{flex:1;overflow-y:auto;padding:22px 26px 60px;scroll-behavior:smooth}
.view{animation:fadeUp .28s ease both;max-width:1240px;margin:0 auto}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------------- 通用组件 ---------------- */
.btn{
  border:1px solid var(--line);background:var(--card-2);color:var(--text);
  padding:8px 14px;border-radius:10px;font-size:13px;font-weight:500;
  display:inline-flex;align-items:center;gap:7px;
  transition:.15s;white-space:nowrap;
}
.btn:hover{background:var(--card-3);border-color:var(--accent)}
.btn:active{transform:translateY(1px)}
.btn.primary{
  background:linear-gradient(135deg,var(--accent),#5570e6);
  border-color:transparent;color:#fff;box-shadow:0 6px 18px rgba(111,141,255,.28);
}
.btn.primary:hover{filter:brightness(1.08)}
.btn.good{background:rgba(61,220,151,.14);border-color:rgba(61,220,151,.4);color:var(--accent-2)}
.btn.danger{background:rgba(255,107,129,.12);border-color:rgba(255,107,129,.35);color:var(--danger)}
.btn.sm{padding:5px 10px;font-size:12px;border-radius:8px}
.btn.ghost{background:transparent}
.icon-btn{
  border:1px solid var(--line);background:var(--card-2);width:34px;height:34px;border-radius:10px;
  display:grid;place-items:center;font-size:15px;
}
.icon-btn:hover{border-color:var(--accent)}
.chip{
  border:1px solid var(--line);background:var(--card-2);color:var(--text-2);
  border-radius:9px;padding:6px 11px;font-size:12px;display:inline-flex;gap:6px;align-items:center;
}
.chip:hover{color:var(--text);border-color:var(--accent)}
.chip.accent{color:#fff;background:linear-gradient(135deg,var(--accent),#5570e6);border-color:transparent}
kbd{
  font-family:var(--mono);font-size:11px;background:var(--card-3);border:1px solid var(--line);
  border-bottom-width:2px;border-radius:5px;padding:1px 5px;color:var(--text-2);
}

.card{
  background:linear-gradient(160deg,var(--card),var(--bg-soft));
  border:1px solid var(--line-soft);border-radius:var(--r);padding:16px 18px;
  box-shadow:var(--shadow-sm);
}
.card.tight{padding:13px 15px}
.card-h{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.card-h h3{font-size:14px}
.card-h .more{margin-left:auto;font-size:12px;color:var(--muted);cursor:pointer}
.card-h .more:hover{color:var(--accent)}

.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.row{display:flex;align-items:center;gap:10px}
.spread{display:flex;align-items:center;justify-content:space-between;gap:10px}
.muted{color:var(--muted)}
.tiny{font-size:11.5px}
.mono{font-family:var(--mono)}
.empty{
  text-align:center;color:var(--muted);padding:34px 10px;font-size:13px;
  border:1px dashed var(--line);border-radius:12px;
}
.empty .big{font-size:26px;display:block;margin-bottom:8px;opacity:.7}

/* KPI */
.kpi{display:flex;align-items:center;gap:13px}
.kpi .kico{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:19px;
  background:var(--card-3);border:1px solid var(--line);
}
.kpi .kv{font-size:24px;font-weight:700;line-height:1.1;letter-spacing:.4px}
.kpi .kl{font-size:11.5px;color:var(--muted);margin-top:2px}
.kpi .kd{font-size:11px;margin-left:auto;text-align:right;white-space:nowrap}

/* 进度条 */
.bar{height:6px;border-radius:20px;background:var(--card-3);overflow:hidden}
.bar > i{display:block;height:100%;border-radius:20px;background:linear-gradient(90deg,var(--accent),var(--purple));transition:width .4s}
.bar.green > i{background:linear-gradient(90deg,var(--accent-2),#2bb8a0)}
.bar.orange > i{background:linear-gradient(90deg,var(--accent-3),#ff8a5b)}

/* 表单 */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.field > label{font-size:12px;color:var(--muted)}
.input, .select, .textarea{
  width:100%;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;
  padding:9px 12px;color:var(--text);outline:none;transition:.15s;
}
.input:focus,.select:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(111,141,255,.15)}
.textarea{resize:vertical;min-height:90px;line-height:1.6}
.select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 16px) 50%,calc(100% - 11px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:32px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* 标签 / 徽章 */
.pill{
  font-size:11px;padding:2px 8px;border-radius:20px;border:1px solid var(--line);
  color:var(--text-2);background:var(--card-2);white-space:nowrap;
}
.pill.math{color:#9db4ff;border-color:rgba(157,180,255,.3);background:rgba(157,180,255,.1)}
.pill.chinese{color:#ffb2c2;border-color:rgba(255,178,194,.3);background:rgba(255,178,194,.1)}
.pill.english{color:#8ee6c4;border-color:rgba(142,230,196,.3);background:rgba(142,230,196,.1)}
.pill.physics{color:#ffd08a;border-color:rgba(255,208,138,.3);background:rgba(255,208,138,.1)}
.pill.chemistry{color:#9fe3ff;border-color:rgba(159,227,255,.3);background:rgba(159,227,255,.1)}
.pill.biology{color:#c2f28e;border-color:rgba(194,242,142,.3);background:rgba(194,242,142,.1)}
.pill.history{color:#e0b8ff;border-color:rgba(224,184,255,.3);background:rgba(224,184,255,.1)}
.pill.other{color:var(--text-2)}.pill.p1{color:#ff9f9f;border-color:rgba(255,159,159,.35);background:rgba(255,159,159,.1)}
.pill.p2{color:#ffd08a;border-color:rgba(255,208,138,.3);background:rgba(255,208,138,.1)}
.pill.p3{color:var(--muted)}

/* 列表行 */
.list{display:flex;flex-direction:column;gap:8px}
.item{
  display:flex;align-items:center;gap:12px;padding:11px 13px;border-radius:12px;
  background:var(--card-2);border:1px solid var(--line-soft);transition:.15s;
}
.item:hover{border-color:var(--line);transform:translateX(1px)}
.item .grow{flex:1;min-width:0}
.item .ttl{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.item .meta{font-size:11px;color:var(--muted);display:flex;gap:8px;align-items:center;margin-top:3px;flex-wrap:wrap}
.item.done .ttl{text-decoration:line-through;color:var(--muted)}
.item .acts{display:flex;gap:6px;opacity:.55;transition:.15s}
.item:hover .acts{opacity:1}
.mini-btn{
  border:0;background:transparent;color:var(--muted);width:26px;height:26px;border-radius:7px;
  display:grid;place-items:center;font-size:13px;
}
.mini-btn:hover{background:var(--card-3);color:var(--text)}
.mini-btn.danger:hover{color:var(--danger)}

.check{
  width:19px;height:19px;border-radius:6px;border:1.5px solid var(--line);
  display:grid;place-items:center;flex:none;font-size:11px;color:transparent;background:transparent;
}
.check:hover{border-color:var(--accent)}
.item.done .check{background:var(--accent-2);border-color:var(--accent-2);color:#06251b}

/* 标签页 */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.tabs button{
  border:1px solid var(--line);background:transparent;color:var(--text-2);
  padding:6px 12px;border-radius:9px;font-size:12.5px;
}
.tabs button:hover{color:var(--text);border-color:var(--accent)}
.tabs button.on{background:rgba(111,141,255,.16);border-color:rgba(111,141,255,.5);color:var(--text)}

/* 环形进度 */
.ring{position:relative;display:grid;place-items:center}
.ring svg{transform:rotate(-90deg)}
.ring .ring-txt{position:absolute;text-align:center}
.ring .ring-txt b{display:block;font-size:26px;font-weight:700;letter-spacing:1px}
.ring .ring-txt span{font-size:11px;color:var(--muted)}

/* 图表 */
.chart-wrap{width:100%;overflow:hidden}
canvas.chart{display:block;width:100%}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:11.5px;color:var(--text-2)}
.legend i{width:9px;height:9px;border-radius:3px;display:inline-block;margin-right:5px}

/* 番茄钟 */
.pomo-wrap{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:16px}
.pomo-stage{display:flex;flex-direction:column;align-items:center;gap:16px;padding:26px 10px}
.pomo-time{font-size:64px;font-weight:700;letter-spacing:2px;font-variant-numeric:tabular-nums;line-height:1}
.pomo-phase{font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--accent)}
.pomo-phase.break{color:var(--accent-2)}
.pomo-controls{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.seg{display:inline-flex;background:var(--card-2);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{border:0;background:transparent;padding:6px 13px;font-size:12px;color:var(--text-2)}
.seg button.on{background:var(--card-3);color:var(--text)}

/* 噪音 */
.noise-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.noise-btn{
  border:1px solid var(--line);background:var(--card-2);border-radius:10px;padding:10px;
  font-size:12px;color:var(--text-2);display:flex;flex-direction:column;gap:3px;align-items:flex-start;
}
.noise-btn span{font-size:16px}
.noise-btn.on{border-color:var(--accent);color:var(--text);background:rgba(111,141,255,.14)}

/* 卡片翻转 */
.flip-stage{perspective:1400px;height:250px;margin-bottom:14px}
.flip{
  position:relative;width:100%;height:100%;transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.4,.2,.2,1);cursor:pointer;
}
.flip.flipped{transform:rotateY(180deg)}
.flip-face{
  position:absolute;inset:0;backface-visibility:hidden;border-radius:16px;
  border:1px solid var(--line);background:linear-gradient(155deg,var(--card-2),var(--card));
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
  padding:24px;text-align:center;box-shadow:var(--shadow-sm);
}
.flip-face.back{transform:rotateY(180deg);background:linear-gradient(155deg,var(--card-3),var(--card))}
.flip-face .q{font-size:23px;font-weight:600;line-height:1.5}
.flip-face .a{font-size:19px;color:var(--accent-2);line-height:1.6}
.flip-face .hint{position:absolute;bottom:12px;font-size:11px;color:var(--muted)}

/* 公式 */
.formula{
  padding:11px 13px;border-radius:11px;background:var(--card-2);border:1px solid var(--line-soft);
  display:flex;gap:12px;align-items:flex-start;cursor:copy;transition:.15s;
}
.formula:hover{border-color:var(--accent);background:var(--card-3)}
.formula .fx{font-family:var(--mono);font-size:14px;color:var(--accent);white-space:nowrap}
.formula .fn{font-size:12px;color:var(--text-2)}
.formula .fd{font-size:11px;color:var(--muted);margin-top:2px}

/* 笔记 */
.notes-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:14px;height:calc(100vh - 190px);min-height:420px}
.notes-side{display:flex;flex-direction:column;gap:8px;overflow:hidden}
.notes-list{overflow-y:auto;display:flex;flex-direction:column;gap:6px;padding-right:2px}
.note-item{padding:9px 11px;border-radius:10px;border:1px solid var(--line-soft);background:var(--card-2);cursor:pointer}
.note-item:hover{border-color:var(--line)}
.note-item.on{border-color:var(--accent);background:rgba(111,141,255,.12)}
.note-item b{font-size:12.5px;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.note-item span{font-size:10.5px;color:var(--muted)}
.notes-main{display:flex;flex-direction:column;gap:10px;min-width:0}
.md-editor{
  flex:1;width:100%;background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;
  padding:14px;color:var(--text);font-family:var(--mono);font-size:13px;line-height:1.75;
  resize:none;outline:none;
}
.md-preview{
  flex:1;overflow-y:auto;background:var(--card-2);border:1px solid var(--line-soft);border-radius:12px;
  padding:16px 18px;font-size:13.5px;line-height:1.8;
}
.md-preview h1,.md-preview h2,.md-preview h3{margin:.6em 0 .4em}
.md-preview h1{font-size:20px}.md-preview h2{font-size:17px}.md-preview h3{font-size:15px}
.md-preview p{margin:.5em 0}
.md-preview ul,.md-preview ol{margin:.5em 0;padding-left:1.4em}
.md-preview code{font-family:var(--mono);background:var(--card-3);padding:1px 5px;border-radius:5px;font-size:12.5px}
.md-preview pre{background:var(--card-3);padding:12px;border-radius:10px;overflow-x:auto}
.md-preview pre code{background:none;padding:0}
.md-preview blockquote{border-left:3px solid var(--accent);margin:.6em 0;padding:.2em 0 .2em 12px;color:var(--text-2)}
.md-preview a{color:var(--accent)}
.md-preview hr{border:0;border-top:1px solid var(--line);margin:1em 0}
.md-preview table{border-collapse:collapse;margin:.6em 0}
.md-preview th,.md-preview td{border:1px solid var(--line);padding:4px 9px;font-size:12.5px}

/* 数学工具 */
.math-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:14px}
.plot-canvas{width:100%;border-radius:12px;background:var(--bg-soft);border:1px solid var(--line);display:block}

/* 弹窗 */
.modal{
  position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px;
  background:rgba(4,8,18,.62);backdrop-filter:blur(6px);animation:fade .18s;
}
.modal.hidden{display:none}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal-box{
  width:min(560px,100%);max-height:86vh;overflow-y:auto;
  background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;
  box-shadow:var(--shadow);animation:pop .2s ease both;
}
@keyframes pop{from{transform:scale(.96);opacity:0}to{transform:none;opacity:1}}
.modal-box h3{font-size:16px;margin-bottom:4px}
.modal-box .desc{font-size:12px;color:var(--muted);margin-bottom:16px}
.modal-foot{display:flex;justify-content:flex-end;gap:9px;margin-top:6px}

/* 命令面板 */
.palette{
  position:fixed;inset:0;z-index:120;background:rgba(4,8,18,.6);backdrop-filter:blur(8px);
  display:flex;justify-content:center;padding-top:12vh;animation:fade .15s;
}
.palette.hidden{display:none}
.palette-box{
  width:min(620px,92vw);max-height:60vh;background:var(--card);border:1px solid var(--line);
  border-radius:16px;box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;
  animation:pop .18s ease both;
}
.palette-box input{
  border:0;border-bottom:1px solid var(--line);background:transparent;padding:15px 18px;
  font-size:15px;outline:none;color:var(--text);
}
.palette-list{overflow-y:auto;padding:6px}
.pal-item{padding:9px 12px;border-radius:9px;display:flex;gap:10px;align-items:center;font-size:13px;cursor:pointer}
.pal-item .k{color:var(--muted);font-size:11px;width:20px;text-align:center}
.pal-item.sel,.pal-item:hover{background:rgba(111,141,255,.16)}
.pal-item small{margin-left:auto;color:var(--muted);font-size:11px}

/* Toast */
.toasts{position:fixed;right:20px;bottom:20px;z-index:200;display:flex;flex-direction:column;gap:8px;align-items:flex-end}
.toast{
  background:var(--card-3);border:1px solid var(--line);border-left:3px solid var(--accent);
  padding:10px 15px;border-radius:10px;font-size:12.5px;box-shadow:var(--shadow);
  animation:slideIn .25s ease both;max-width:320px;
}
.toast.good{border-left-color:var(--accent-2)}
.toast.warn{border-left-color:var(--accent-3)}
.toast.bad{border-left-color:var(--danger)}
@keyframes slideIn{from{transform:translateX(30px);opacity:0}to{transform:none;opacity:1}}

/* 热力图 */
.heat{display:grid;grid-template-columns:repeat(26,1fr);gap:3px;max-width:100%}
.heat i{aspect-ratio:1;border-radius:2.5px;background:var(--card-3);display:block}
.heat i.l1{background:rgba(111,141,255,.28)}
.heat i.l2{background:rgba(111,141,255,.5)}
.heat i.l3{background:rgba(111,141,255,.74)}
.heat i.l4{background:var(--accent)}

/* 统计条 */
.hbars{display:flex;flex-direction:column;gap:10px}
.hbar{display:grid;grid-template-columns:70px 1fr 52px;gap:10px;align-items:center;font-size:12px}
.hbar .track{height:9px;border-radius:20px;background:var(--card-3);overflow:hidden}
.hbar .track i{display:block;height:100%;border-radius:20px;background:linear-gradient(90deg,var(--accent),var(--purple))}

/* 移动端 */
#menuBtn{display:none}
@media (max-width: 1080px){
  .pomo-wrap{grid-template-columns:1fr}
  .math-layout{grid-template-columns:1fr}
  .g4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 860px){
  #app{grid-template-columns:1fr}
  .sidebar{
    position:fixed;inset:0 auto 0 0;width:78vw;max-width:300px;
    transform:translateX(-102%);transition:transform .25s ease;box-shadow:var(--shadow);
  }
  body.nav-open .sidebar{transform:none}
  body.nav-open::after{
    content:"";position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:25;
  }
  #menuBtn{display:grid}
  .topbar{padding:12px 16px 10px;gap:10px}
  .topbar h1{font-size:16px}
  .top-actions .chip span{display:none}
  .view-root{padding:16px 14px 90px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .g4.kpis,.grid.g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .kpi .kd{display:none}
  .form-row{grid-template-columns:1fr}
  .notes-layout{grid-template-columns:1fr;height:auto}
  .notes-side{max-height:200px}
  .md-editor{min-height:220px}
  .md-preview{min-height:220px;max-height:340px}
  .pomo-time{font-size:52px}
  .heat{grid-template-columns:repeat(18,1fr)}
  .notes-layout.resp{grid-template-columns:1fr}
}

/* 移动端底部导航 */
.mobile-tabs{display:none}
@media (max-width: 860px){
  .mobile-tabs{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:40;
    background:rgba(12,18,34,.92);backdrop-filter:blur(12px);border-top:1px solid var(--line);
    padding:6px 4px calc(6px + env(safe-area-inset-bottom));
  }
  html[data-theme="light"] .mobile-tabs{background:rgba(255,255,255,.94)}
  .mobile-tabs button{
    flex:1;border:0;background:transparent;color:var(--muted);font-size:10.5px;
    display:flex;flex-direction:column;align-items:center;gap:3px;padding:5px 0;border-radius:10px;
  }
  .mobile-tabs button .ic{font-size:17px}
  .mobile-tabs button.on{color:var(--accent)}
}

/* ===== 布局补充：分栏 / 空态 ===== */
.split{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:14px;align-items:start}
.split.even{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
@media (max-width:1080px){ .split,.split.even{grid-template-columns:minmax(0,1fr)} }
@media (max-width:1200px){ .grid.g4{grid-template-columns:repeat(2,minmax(0,1fr))} }

.empty-box{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  padding:44px 20px;text-align:center;color:var(--muted);font-size:13px;line-height:1.8;
  border:1px dashed var(--line);border-radius:14px;background:rgba(255,255,255,.015);
}
.empty-box .em{font-size:30px;line-height:1}

.heat i.l0{background:var(--card-3)}
.heat{max-width:356px}

/* 复选框对比度 */
.check{border-color:rgba(255,255,255,.34)}
.check:hover{border-color:var(--accent)}
html[data-theme="light"] .check{border-color:rgba(24,34,64,.22)}

/* 浅色主题下的小标签需要更深的字色 */
html[data-theme="light"] .pill{filter:brightness(.62) saturate(1.5)}