/* ============ 基础 ============ */
:root{
  --paper:#f4efe4;
  --paper-2:#ece4d4;
  --paper-3:#e3d9c5;
  --card:#fffdf8;
  --card-2:#faf6ec;
  --ink:#23211c;
  --ink-2:#4c473d;
  --muted:#857c6c;
  --line:#e2d8c5;
  --line-strong:#d3c6ad;
  --accent:#2f5d50;
  --accent-deep:#22453b;
  --accent-soft:#e3eee8;
  --rust:#a55233;
  --rust-soft:#f6e4da;
  --gold:#a9822c;
  --gold-soft:#f6ecd2;
  --blue:#3f5a82;
  --blue-soft:#e4eaf4;
  --danger:#a33a2f;
  --shadow:0 1px 2px rgba(52,42,28,.05), 0 8px 24px rgba(52,42,28,.06);
  --shadow-lg:0 20px 60px rgba(42,34,22,.16);
  --radius:16px;
  --radius-sm:10px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong","SimSun",serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;max-width:100%;overflow-x:hidden}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(900px 500px at 8% -5%, rgba(197,164,96,.12), transparent 60%),
    radial-gradient(700px 500px at 100% 0%, rgba(47,93,80,.08), transparent 55%),
    repeating-linear-gradient(0deg, rgba(120,100,70,.018) 0 1px, transparent 1px 3px);
}
button{font-family:inherit;color:inherit}
a{color:var(--accent)}
h1,h2,h3,h4{margin:0;font-weight:650;line-height:1.35}
p{margin:0}
::selection{background:#cfe3d9}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
.ico{display:inline-flex;width:18px;height:18px;flex:0 0 auto}
.ico svg{width:100%;height:100%;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* ============ 布局 ============ */
#app{display:flex;min-height:100vh;position:relative;z-index:1;min-width:0}
#sidebar{
  width:236px;flex:0 0 236px;position:sticky;top:0;height:100vh;
  padding:26px 16px 20px;display:flex;flex-direction:column;gap:20px;
  border-right:1px solid rgba(120,100,70,.12);
  background:linear-gradient(180deg, rgba(255,253,248,.72), rgba(244,239,228,.4));
  backdrop-filter:blur(8px);
}
.brand{display:flex;align-items:center;gap:11px;padding:0 8px}
.brand-mark{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(145deg,var(--accent),var(--accent-deep));
  color:#f7f1e3;font-family:var(--serif);font-size:23px;font-weight:700;
  box-shadow:0 4px 14px rgba(47,93,80,.28);letter-spacing:0;
}
.brand-text{display:flex;flex-direction:column;line-height:1.3}
.brand-text strong{font-family:var(--serif);font-size:17px;letter-spacing:.06em}
.brand-text span{font-size:11px;color:var(--muted);letter-spacing:.14em}
.side-nav{display:flex;flex-direction:column;gap:3px}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border:0;border-radius:10px;
  background:transparent;color:var(--ink-2);font-size:14px;cursor:pointer;text-align:left;
  transition:background .15s,color .15s;
}
.nav-item:hover{background:rgba(47,93,80,.06)}
.nav-item.active{background:var(--accent);color:#f7f2e6;box-shadow:0 4px 12px rgba(47,93,80,.18)}
.nav-item .ico{opacity:.85}
.side-subjects{margin-top:2px;padding-top:16px;border-top:1px dashed var(--line);display:flex;flex-direction:column;gap:2px}
.side-subjects .label{font-size:11px;letter-spacing:.14em;color:var(--muted);padding:0 12px 7px}
.subj-mini{
  display:flex;align-items:center;gap:9px;padding:8px 12px;border:0;background:transparent;
  border-radius:9px;cursor:pointer;text-align:left;font-size:13px;color:var(--ink-2);
}
.subj-mini:hover{background:rgba(47,93,80,.06)}
.subj-mini .dot{width:7px;height:7px;border-radius:50%;flex:0 0 auto}
.subj-mini b{font-weight:550;flex:1}
.subj-mini em{font-style:normal;font-size:11px;color:var(--muted);font-family:var(--mono)}
.side-foot{margin-top:auto;padding:12px;border-radius:12px;background:var(--card);border:1px solid var(--line);font-size:12px;color:var(--muted)}
.side-foot b{display:block;font-size:22px;color:var(--accent);font-family:var(--serif);line-height:1.2}
.side-foot span{display:block;margin-top:3px}

#main{flex:1;min-width:0;max-width:100%;display:flex;flex-direction:column}
#topbar{
  position:sticky;top:0;z-index:20;height:64px;display:flex;align-items:center;justify-content:space-between;
  padding:0 30px;border-bottom:1px solid rgba(120,100,70,.12);
  background:rgba(244,239,228,.82);backdrop-filter:blur(12px);
}
.topbar-left{display:flex;align-items:center;gap:10px;min-width:0}
.topbar-right{display:flex;align-items:center;gap:8px}
.page-title{font-family:var(--serif);font-size:19px;letter-spacing:.04em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#view{padding:28px 30px 90px;max-width:1060px;width:100%;min-width:0;margin:0 auto;outline:none}

#tabbar{display:none}

/* ============ 通用组件 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid transparent;
  padding:9px 16px;border-radius:10px;background:var(--card);color:var(--ink);font-size:14px;
  cursor:pointer;transition:transform .12s,box-shadow .15s,background .15s;white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.primary{background:var(--accent);color:#f8f3e7;box-shadow:0 4px 14px rgba(47,93,80,.22)}
.btn.primary:hover{background:var(--accent-deep)}
.btn.soft{background:var(--accent-soft);color:var(--accent-deep);border-color:transparent}
.btn.ghost{background:transparent;border-color:var(--line-strong);color:var(--ink-2)}
.btn.ghost:hover{background:var(--card)}
.btn.rust{background:var(--rust);color:#fff8f0}
.btn.danger{background:var(--rust-soft);color:var(--danger)}
.btn.sm{padding:6px 11px;font-size:12.5px;border-radius:8px}
.btn.lg{padding:12px 22px;font-size:15px;border-radius:12px}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.ghost-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line-strong);background:transparent;
  color:var(--ink-2);padding:7px 12px;border-radius:9px;font-size:13px;cursor:pointer}
.ghost-btn:hover{background:var(--card)}
.icon-btn{width:38px;height:38px;display:inline-grid;place-items:center;border:1px solid transparent;
  background:transparent;border-radius:9px;cursor:pointer;color:var(--ink-2)}
.icon-btn:hover{background:rgba(47,93,80,.07)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:22px}
.row{display:flex;align-items:center;gap:10px}
.row.wrap{flex-wrap:wrap}
.between{justify-content:space-between}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.tiny{font-size:11.5px}
.serif{font-family:var(--serif)}
.mono{font-family:var(--mono)}
.center{text-align:center}
.grow{flex:1;min-width:0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:26px 0 12px}
.section-head h2{font-family:var(--serif);font-size:18px;letter-spacing:.04em}
.section-head .sub{font-size:12.5px;color:var(--muted)}
.divider{height:1px;background:var(--line);margin:18px 0}

.tag{display:inline-flex;align-items:center;gap:4px;padding:2px 8px;border-radius:6px;font-size:11.5px;font-weight:600;letter-spacing:.02em}
.tag.t-名解{background:var(--gold-soft);color:#7d5c14}
.tag.t-简答{background:var(--accent-soft);color:var(--accent-deep)}
.tag.t-论述{background:var(--rust-soft);color:#8b3f24}
.tag.t-实验{background:var(--blue-soft);color:#31496c}
.tag.plain{background:var(--paper-2);color:var(--ink-2);font-weight:500}
.year{
  display:inline-flex;align-items:center;padding:1px 7px;border-radius:5px;font-size:11px;font-family:var(--mono);
  color:var(--muted);border:1px solid var(--line-strong);background:rgba(255,253,248,.6);
}
.year.now{color:var(--accent-deep);border-color:#b9d2c6;background:var(--accent-soft);font-weight:700}
.chip{
  display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:999px;font-size:12.5px;
  border:1px solid var(--line-strong);background:var(--card);color:var(--ink-2);cursor:pointer;
  transition:all .12s;white-space:nowrap;
}
.chip:hover{border-color:var(--accent)}
.chip.on{background:var(--accent);color:#f8f3e7;border-color:var(--accent)}
.chip.on .dot{background:#f8f3e7}
.chip .dot{width:6px;height:6px;border-radius:50%;background:var(--line-strong)}
.tag-btn{border:0;background:transparent;padding:0;cursor:pointer;color:var(--accent);font-size:12.5px}
.meter{height:6px;border-radius:99px;background:var(--paper-2);overflow:hidden}
.meter>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--accent),#5d9580);transition:width .4s}
.empty{padding:46px 20px;text-align:center;color:var(--muted)}
.empty b{display:block;font-family:var(--serif);font-size:17px;color:var(--ink-2);margin-bottom:6px}

/* ============ 首页 ============ */
.hero{display:grid;grid-template-columns:1.35fr .9fr;gap:18px;margin-bottom:6px}
.hero-main{
  position:relative;overflow:hidden;min-width:0;padding:28px 30px;border-radius:20px;color:#f8f3e6;
  background:linear-gradient(135deg,#2f5d50 0%,#24493f 55%,#1d3a33 100%);
  box-shadow:0 18px 44px rgba(35,64,55,.28);
}
.hero-main::after{
  content:"";position:absolute;right:-40px;top:-60px;width:240px;height:240px;border-radius:50%;
  border:1px solid rgba(255,255,255,.14);box-shadow:0 0 0 36px rgba(255,255,255,.04),0 0 0 76px rgba(255,255,255,.03);
}
.hero-main .eyebrow{font-size:11.5px;letter-spacing:.22em;color:rgba(248,243,230,.62);text-transform:uppercase}
.hero-main h1{font-family:var(--serif);font-size:27px;font-weight:600;letter-spacing:.05em;margin:8px 0 6px}
.hero-main p{color:rgba(248,243,230,.72);font-size:13px;max-width:440px}
.hero-actions{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.hero-main .btn.primary{background:#f3ead6;color:#25473d;box-shadow:none}
.hero-main .btn.primary:hover{background:#fff8e9}
.hero-main .btn.line{background:transparent;border-color:rgba(248,243,230,.34);color:#f8f3e6}
.countdown{padding:22px;display:flex;flex-direction:column;justify-content:space-between;border-radius:20px}
.countdown .num{font-family:var(--serif);font-size:46px;line-height:1;color:var(--accent);letter-spacing:-.02em}
.countdown .num small{font-size:14px;color:var(--muted);letter-spacing:.08em;margin-left:6px;font-family:var(--sans)}
.countdown .lbl{font-size:12px;color:var(--muted);letter-spacing:.1em}
.countdown .goal{margin-top:16px}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
.stat{padding:15px 16px;border-radius:14px;background:var(--card);border:1px solid var(--line)}
.stat b{display:block;font-family:var(--serif);font-size:24px;line-height:1.2;color:var(--ink)}
.stat span{font-size:11.5px;color:var(--muted)}
.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.subject-card{
  padding:17px 18px;border-radius:15px;background:var(--card);border:1px solid var(--line);
  cursor:pointer;transition:transform .15s,box-shadow .15s;text-align:left;
}
.subject-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.subject-card .top{display:flex;align-items:center;justify-content:space-between}
.subject-card h3{font-family:var(--serif);font-size:15.5px}
.subject-card .count{font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.subject-card .meta{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-top:9px}
.subject-card .meter{margin-top:8px}
.quick-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:12px}
.quick-action{
  display:flex;align-items:center;gap:12px;padding:15px 16px;border-radius:14px;
  border:1px dashed var(--line-strong);background:rgba(255,253,248,.5);cursor:pointer;text-align:left;
}
.quick-action:hover{background:var(--card);border-style:solid}
.quick-action .qi{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent-deep);flex:0 0 auto}
.quick-action b{display:block;font-size:13.5px}
.quick-action span{font-size:11.5px;color:var(--muted)}

/* ============ 题库 ============ */
.filter-bar{padding:16px 18px;border-radius:16px;margin-bottom:16px}
.subject-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.subject-tab{
  border:1px solid transparent;background:transparent;padding:8px 14px;border-radius:9px;
  font-size:13.5px;color:var(--ink-2);cursor:pointer;display:inline-flex;align-items:center;gap:7px;
}
.subject-tab.on{background:var(--ink);color:var(--paper);box-shadow:0 3px 10px rgba(35,33,28,.18)}
.subject-tab .n{font-family:var(--mono);font-size:10.5px;opacity:.6}
.filter-row{display:flex;gap:9px;flex-wrap:wrap;align-items:center}
.select{
  appearance:none;border:1px solid var(--line-strong);background:var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23857c6c' fill='none' stroke-width='1.4'/%3E%3C/svg%3E") no-repeat right 11px center;
  padding:8px 30px 8px 11px;border-radius:9px;font-size:12.5px;color:var(--ink-2);cursor:pointer;max-width:210px;
}
.search-box{display:flex;align-items:center;gap:7px;border:1px solid var(--line-strong);background:var(--card);
  border-radius:9px;padding:0 11px;height:36px;min-width:180px;flex:1;max-width:320px}
.search-box input{border:0;background:transparent;outline:0;font-size:13px;width:100%;color:var(--ink)}
.search-box .ico{width:15px;height:15px;color:var(--muted)}
.q-list{display:flex;flex-direction:column;gap:9px}
.q-item{
  display:flex;gap:14px;align-items:flex-start;padding:14px 16px;border-radius:13px;background:var(--card);
  border:1px solid var(--line);cursor:pointer;transition:border-color .15s,transform .15s,box-shadow .15s;
}
.q-item:hover{border-color:#b9cdc2;transform:translateY(-1px);box-shadow:var(--shadow)}
.q-item .q-index{font-family:var(--mono);font-size:11px;color:var(--muted);padding-top:2px;width:34px;flex:0 0 auto}
.q-item .q-main{flex:1;min-width:0}
.q-item .q-text{font-family:var(--serif);font-size:14.5px;line-height:1.6;color:var(--ink);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.q-item .q-meta{display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin-top:7px}
.q-item .q-right{display:flex;flex-direction:column;align-items:flex-end;gap:5px;flex:0 0 auto}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--line-strong)}
.status-dot.known{background:#4f8a6d}
.status-dot.fuzzy{background:#c9a227}
.status-dot.unknown{background:#b25b43}
.answer-flag{font-size:10.5px;color:var(--muted)}
.answer-flag.has{color:#4f8a6d}
.load-more{display:flex;justify-content:center;margin:20px 0}
.list-meta{display:flex;justify-content:space-between;align-items:center;margin:6px 2px 12px;font-size:12px;color:var(--muted)}

/* ============ 学习卡片 ============ */
.study-wrap{max-width:820px;margin:0 auto}
.study-top{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.study-progress{flex:1}
.study-progress .bar{height:4px;border-radius:99px;background:var(--paper-2);overflow:hidden}
.study-progress .bar>i{display:block;height:100%;background:var(--accent);border-radius:99px;transition:width .3s}
.study-progress .txt{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-bottom:6px}
.study-card{padding:28px 30px 24px;border-radius:20px;position:relative;overflow:hidden}
.study-card::before{content:"";position:absolute;left:28px;top:0;width:68px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--accent),#a9822c)}
.study-meta{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:14px}
.study-meta .src{margin-left:auto;font-size:11px;color:var(--muted)}
.question-text{font-family:var(--serif);font-size:22px;line-height:1.75;letter-spacing:.01em;color:var(--ink);word-break:break-word}
.question-text.long{font-size:19px}
.question-sub{font-size:12px;color:var(--muted);margin-top:10px}
.answer-zone{margin-top:22px;padding-top:18px;border-top:1px dashed var(--line-strong)}
.answer-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.answer-head .lbl{font-size:11.5px;letter-spacing:.16em;color:var(--muted)}
.answer-tools{display:flex;gap:6px;flex-wrap:wrap}
.answer-tools .chip{padding:4px 9px;font-size:11.5px}
.answer-body{font-size:14.5px;line-height:1.92;color:var(--ink-2);word-break:break-word}
.answer-body p{margin:0 0 10px}
.answer-hidden{
  padding:36px 20px;text-align:center;border:1px dashed var(--line-strong);border-radius:12px;
  background:linear-gradient(180deg,rgba(236,228,212,.35),rgba(255,253,248,.2));cursor:pointer;
}
.answer-hidden b{display:block;font-family:var(--serif);font-size:16px;margin-bottom:4px;color:var(--ink-2)}
.answer-hidden span{font-size:12px;color:var(--muted)}
.seg{
  display:block;position:relative;padding:5px 8px 5px 10px;margin:1px -8px;border-radius:7px;
  border-left:2px solid transparent;transition:background .12s,border-color .12s;
}
.seg:hover{background:rgba(47,93,80,.045)}
.seg.marked{border-left-color:var(--gold);background:rgba(169,130,44,.07)}
.seg.blurred{
  filter:blur(5px);opacity:.62;cursor:pointer;user-select:none;transition:filter .2s,opacity .2s;
  background:rgba(120,100,70,.05);
}
.seg.blurred:hover{filter:blur(4px);opacity:.8}
.seg .seg-mark{
  position:absolute;right:2px;top:2px;border:0;background:transparent;color:var(--line-strong);
  cursor:pointer;font-size:13px;padding:2px 4px;opacity:.35;transition:opacity .12s;
}
.seg:hover .seg-mark{opacity:1}
.seg .seg-mark.on{opacity:1;color:var(--gold)}
.memory-bar{display:flex;gap:6px;flex-wrap:wrap;margin:4px 0 14px}
.memory-pill{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:99px;
  background:var(--gold-soft);color:#7d5c14;font-size:11.5px;border:1px solid #e8d9b2;cursor:pointer;max-width:230px}
.memory-pill span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.term-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.term-chip{display:inline-flex;align-items:center;gap:4px;padding:3px 9px;border-radius:6px;border:1px solid #d8e4de;
  background:#f2f7f4;color:var(--accent-deep);font-size:11.5px;cursor:pointer}
.term-chip:hover{background:var(--accent-soft)}
.term-chip .pg{color:var(--muted);font-family:var(--mono);font-size:10px}
.kw{color:var(--accent-deep);border-bottom:1px dotted #8fb3a3;cursor:pointer;font-weight:600}
.kw:hover{background:var(--accent-soft)}
.empty-answer{padding:18px;border:1px dashed var(--line-strong);border-radius:11px;background:var(--card-2)}
.empty-answer b{display:block;font-family:var(--serif);font-size:14.5px;margin-bottom:4px}
.empty-answer p{font-size:12.5px;color:var(--muted);margin-bottom:10px}
.related-list{display:flex;flex-direction:column;gap:7px;margin-top:10px}
.related-item{padding:9px 11px;border-radius:8px;background:rgba(255,253,248,.7);border:1px solid var(--line);font-size:12px;color:var(--ink-2);line-height:1.6}
.related-item .s{display:block;font-size:10.5px;color:var(--muted);margin-bottom:3px}
.study-actions{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin-top:18px}
.study-actions .spacer{flex:1}
.grade-group{display:flex;gap:6px;flex-wrap:wrap}
.grade-btn{border:1px solid var(--line-strong);background:var(--card);border-radius:9px;padding:7px 12px;font-size:12.5px;cursor:pointer;display:inline-flex;align-items:center;gap:5px}
.grade-btn:hover{border-color:var(--accent)}
.grade-btn[data-g="0"]:hover{color:var(--danger);border-color:var(--danger)}
.grade-btn[data-g="1"]:hover{color:#8a6a12;border-color:#c9a227}
.grade-btn[data-g="2"]:hover{color:var(--accent);border-color:var(--accent)}
.study-foot{display:flex;justify-content:space-between;align-items:center;margin-top:14px;font-size:11.5px;color:var(--muted)}

/* 答题模式 */
.answer-input{width:100%;min-height:180px;resize:vertical;border:1px solid var(--line-strong);border-radius:12px;
  background:var(--card);padding:14px 15px;font-family:var(--sans);font-size:14px;line-height:1.8;color:var(--ink);outline:none}
.answer-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,93,80,.08)}
.input-meta{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-top:7px}
.eval-panel{margin-top:18px;padding:18px;border-radius:14px;background:var(--card-2);border:1px solid var(--line)}
.score-row{display:flex;align-items:center;gap:16px;margin-bottom:14px}
.score-ring{
  --p:0;width:64px;height:64px;border-radius:50%;display:grid;place-items:center;flex:0 0 auto;
  background:conic-gradient(var(--accent) calc(var(--p)*1%), var(--paper-3) 0);
  position:relative;
}
.score-ring::before{content:"";position:absolute;inset:6px;border-radius:50%;background:var(--card-2)}
.score-ring b{position:relative;font-family:var(--serif);font-size:19px;color:var(--accent)}
.score-info h4{font-size:14px;margin-bottom:3px}
.score-info p{font-size:12px;color:var(--muted)}
.kw-grid{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 14px}
.kw-pill{padding:3px 9px;border-radius:6px;font-size:11.5px;border:1px solid var(--line)}
.kw-pill.hit{background:var(--accent-soft);border-color:#b9d2c6;color:var(--accent-deep)}
.kw-pill.miss{background:var(--rust-soft);border-color:#e8c9bb;color:#8b3f24}
.eval-block{margin-top:12px}
.eval-block h5{font-size:12px;letter-spacing:.08em;color:var(--muted);margin-bottom:6px;font-weight:600}
.eval-block ul{margin:0;padding-left:18px;font-size:13px;color:var(--ink-2)}
.eval-block li{margin:3px 0}
.ai-box{margin-top:12px;padding:14px;border-radius:11px;background:linear-gradient(135deg,#f3f7f4,#fbf7ee);border:1px solid #d8e4de;font-size:13px;line-height:1.8}
.ai-box h4{font-size:13px;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.ai-loading{display:inline-flex;gap:5px;align-items:center;color:var(--muted);font-size:12px}
.ai-loading i{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:bounce .9s infinite}
.ai-loading i:nth-child(2){animation-delay:.15s}.ai-loading i:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,80%,100%{transform:translateY(0);opacity:.35}40%{transform:translateY(-4px);opacity:1}}

/* ============ 随机组题 ============ */
.random-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
.form-block{margin-bottom:20px}
.form-block>label{display:block;font-size:12px;letter-spacing:.1em;color:var(--muted);margin-bottom:9px}
.choice-row{display:flex;gap:8px;flex-wrap:wrap}
.count-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.count-opt{border:1px solid var(--line-strong);background:var(--card);border-radius:10px;padding:12px 6px;text-align:center;cursor:pointer;font-family:var(--mono);font-size:15px}
.count-opt.on{background:var(--accent);border-color:var(--accent);color:#f8f3e7}
.chapter-picker{max-height:210px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:10px;background:var(--card-2);display:flex;flex-wrap:wrap;gap:6px}
.chapter-picker .chip{font-size:11.5px;padding:4px 9px}
.random-preview{padding:20px;border-radius:16px;background:linear-gradient(160deg,#2f5d50,#23473d);color:#f6f0e2;height:100%}
.random-preview h3{font-family:var(--serif);font-size:19px;margin-bottom:4px}
.random-preview p{font-size:12px;color:rgba(246,240,226,.66);line-height:1.7}
.random-preview .big{font-family:var(--serif);font-size:56px;line-height:1;margin:18px 0 2px}
.random-preview .unit{font-size:12px;color:rgba(246,240,226,.6);letter-spacing:.1em}
.random-preview .preview-meta{display:flex;gap:16px;margin-top:18px;font-size:11.5px;color:rgba(246,240,226,.7)}
.random-preview .preview-meta b{display:block;font-family:var(--mono);font-size:15px;color:#f6f0e2}

/* ============ 术语库 ============ */
.glossary-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.gloss-card{padding:14px 16px;border-radius:12px;background:var(--card);border:1px solid var(--line);cursor:pointer;transition:border-color .12s,transform .12s}
.gloss-card:hover{border-color:#b9cdc2;transform:translateY(-1px)}
.gloss-card .term{font-family:var(--serif);font-size:16px;font-weight:650}
.gloss-card .abbr{font-size:12px;color:var(--accent-deep);margin-left:6px;font-family:var(--mono)}
.gloss-card .def{font-size:12px;color:var(--muted);line-height:1.65;margin-top:5px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.gloss-card .meta{display:flex;gap:8px;align-items:center;margin-top:7px}
.abbr-table{display:grid;grid-template-columns:repeat(2,1fr);gap:0 18px;margin-top:10px}
.abbr-row{display:flex;gap:10px;align-items:baseline;padding:8px 2px;border-bottom:1px dashed var(--line);font-size:12.5px}
.abbr-row b{font-family:var(--mono);color:var(--accent-deep);flex:0 0 82px}
.abbr-row span{color:var(--ink-2)}

/* ============ 统计 ============ */
.stats-hero{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stats-hero .stat b{font-size:27px}
.progress-list{display:flex;flex-direction:column;gap:13px}
.progress-item .top{display:flex;justify-content:space-between;font-size:12.5px;margin-bottom:6px}
.progress-item .top b{font-weight:550}
.progress-item .top span{color:var(--muted);font-family:var(--mono);font-size:11.5px}
.heatmap{display:grid;grid-template-columns:repeat(30,1fr);gap:3px;margin-top:12px}
.heat-cell{aspect-ratio:1;border-radius:2px;background:var(--paper-2);min-width:0}
.heat-cell.l1{background:#cfe1d7}.heat-cell.l2{background:#9dc2b1}.heat-cell.l3{background:#5f947d}.heat-cell.l4{background:#2f5d50}
.heat-legend{display:flex;align-items:center;gap:5px;font-size:10.5px;color:var(--muted);margin-top:8px;justify-content:flex-end}
.heat-legend i{width:9px;height:9px;border-radius:2px;background:var(--paper-2);display:inline-block}
.chapter-table{width:100%;border-collapse:collapse;font-size:12.5px}
.chapter-table th,.chapter-table td{padding:8px 10px;text-align:left;border-bottom:1px solid var(--line)}
.chapter-table th{font-size:11px;letter-spacing:.08em;color:var(--muted);font-weight:600}
.chapter-table td.n{font-family:var(--mono);font-size:11.5px;color:var(--muted)}

/* ============ 设置 ============ */
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{margin-bottom:15px}
.field label{display:block;font-size:12px;letter-spacing:.06em;color:var(--muted);margin-bottom:6px}
.field input,.field select{width:100%;border:1px solid var(--line-strong);background:var(--card);border-radius:9px;
  padding:9px 11px;font-size:13px;color:var(--ink);outline:none;font-family:inherit}
.field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,93,80,.08)}
.field .hint{font-size:11px;color:var(--muted);margin-top:5px;line-height:1.6}
.switch{position:relative;display:inline-block;width:40px;height:22px;flex:0 0 auto}
.switch input{opacity:0;width:0;height:0}
.switch i{position:absolute;inset:0;background:var(--paper-3);border-radius:99px;transition:.18s;cursor:pointer}
.switch i::after{content:"";position:absolute;width:16px;height:16px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.18s;box-shadow:0 1px 3px rgba(0,0,0,.18)}
.switch input:checked + i{background:var(--accent)}
.switch input:checked + i::after{transform:translateX(18px)}
.setting-line{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line);flex-wrap:wrap}
.setting-line>div{min-width:0;flex:1}
.setting-line .mono{word-break:break-all}
.setting-line .tag{white-space:normal}
.setting-line:last-child{border-bottom:0}
.setting-line b{font-size:13px;font-weight:550;display:block}
.setting-line span{font-size:11.5px;color:var(--muted)}
.danger-zone{border:1px solid #e8c9bb;background:#fdf4ef;border-radius:14px;padding:16px}
.danger-zone h4{color:#8b3f24;font-size:13px;margin-bottom:6px}

/* ============ 弹层 ============ */
.modal-mask{position:fixed;inset:0;background:rgba(35,30,22,.42);backdrop-filter:blur(3px);z-index:100;
  display:flex;align-items:flex-end;justify-content:center;padding:0;animation:fade .16s}
.modal{background:var(--card);width:min(680px,100%);max-height:88vh;overflow:auto;border-radius:20px 20px 0 0;
  padding:24px 26px 30px;box-shadow:var(--shadow-lg);animation:slideup .22s cubic-bezier(.2,.8,.2,1)}
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes slideup{from{transform:translateY(26px);opacity:.6}to{transform:translateY(0);opacity:1}}
@media(min-width:761px){
  .modal-mask{align-items:center;padding:20px}
  .modal{border-radius:18px;padding:28px 30px 30px}
}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:6px}
.modal-head h3{font-family:var(--serif);font-size:20px;line-height:1.45}
.modal-close{border:0;background:var(--paper-2);width:32px;height:32px;border-radius:50%;cursor:pointer;display:grid;place-items:center;color:var(--ink-2);flex:0 0 auto}
.modal-body{font-size:14px;line-height:1.85;color:var(--ink-2)}
.modal-body h4{font-size:12px;letter-spacing:.1em;color:var(--muted);margin:16px 0 6px}
.modal-body p{margin:0 0 8px}
.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:18px;flex-wrap:wrap}
.source-line{font-size:11px;color:var(--muted);margin-top:10px;padding-top:9px;border-top:1px dashed var(--line)}
#toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(14px);background:var(--ink);color:var(--paper);
  padding:9px 16px;border-radius:10px;font-size:12.5px;z-index:200;opacity:0;pointer-events:none;transition:.2s;max-width:88vw;text-align:center}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.selection-action{
  position:absolute;z-index:90;background:var(--ink);color:var(--paper);padding:4px;border-radius:999px;
  font-size:12px;box-shadow:0 6px 18px rgba(35,30,22,.25);display:flex;align-items:center;gap:2px;
}
.selection-action button{border:0;background:transparent;color:inherit;font:inherit;font-size:12px;padding:4px 10px;border-radius:999px;cursor:pointer;display:flex;align-items:center;gap:4px}
.selection-action button:hover{background:rgba(255,255,255,.16)}
.selection-action .ico{width:13px;height:13px}

/* 记忆点关键词 */
.mem-kw{background:rgba(169,130,44,.20);border-radius:3px;padding:0 2px;color:inherit;box-shadow:inset 0 -2px 0 rgba(169,130,44,.35);cursor:pointer}
.mem-kw.flash{background:rgba(169,130,44,.45)}
.ans-part.blurred{filter:blur(5px);opacity:.8;user-select:none;transition:filter .15s}
.ans-part.blurred:hover{filter:blur(2.5px)}
.mem-line{margin-top:8px;font-size:12.5px;color:var(--muted)}
.mem-line .kw{display:inline-block;margin:0 3px;padding:1px 7px;border-radius:6px;background:rgba(169,130,44,.14);color:var(--ink);cursor:pointer}
.mem-line .hint{opacity:.8}
.memory-bar{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:10px 0 6px}
.memory-label{font-size:11px;color:var(--muted);letter-spacing:.08em}
.memory-pill{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card);border-radius:999px;padding:3px 10px;font-size:12px;cursor:pointer}
.memory-pill .mem-x{color:var(--muted);font-weight:700;padding-left:2px}
.memory-pill .mem-x:hover{color:var(--danger)}

/* ============ 响应式 ============ */
.only-mobile{display:none}
@media(max-width:1080px){
  #sidebar{width:210px;flex-basis:210px}
  .hero{grid-template-columns:1fr}
  .countdown{flex-direction:row;align-items:center;gap:20px}
  .countdown .goal{margin-top:0;flex:1}
}
@media(max-width:860px){
  #sidebar{display:none}
  #topbar{padding:0 16px;height:56px}
  #view{padding:18px 16px 96px}
  #tabbar{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:40;height:62px;padding-bottom:env(safe-area-inset-bottom);
    background:rgba(255,253,248,.94);backdrop-filter:blur(14px);border-top:1px solid var(--line);
  }
  #tabbar button{flex:1;border:0;background:transparent;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--muted);font-size:10.5px;cursor:pointer}
  #tabbar button.active{color:var(--accent-deep)}
  #tabbar button.active .ico{transform:translateY(-1px)}
  #tabbar .ico{width:19px;height:19px}
  #tabbar em{font-style:normal}
  .only-mobile{display:inline-grid}
  .hero-main{padding:24px 22px;min-width:0}
  .hero-main h1{font-size:22px;overflow-wrap:anywhere}
  .hero-main .eyebrow{font-size:9px;letter-spacing:.1em;line-height:1.5;white-space:normal}
  .hero-main p{font-size:12.5px}
  .hero-actions{gap:8px}
  .hero-actions .btn{padding:9px 13px;font-size:13.5px}
  .countdown{flex-direction:column;align-items:flex-start;gap:12px}
  .countdown .goal{width:100%}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .subject-grid{grid-template-columns:1fr}
  .quick-actions{grid-template-columns:1fr}
  .random-grid,.settings-grid{grid-template-columns:1fr}
  .glossary-grid,.abbr-table{grid-template-columns:1fr}
  .stats-hero{grid-template-columns:repeat(2,1fr)}
  .study-card{padding:22px 18px 18px;border-radius:16px}
  .question-text{font-size:19px}
  .question-text.long{font-size:17px}
  .answer-body{font-size:14px}
  .chapter-table{font-size:11.5px}
  .hide-sm{display:none}
  .study-actions .spacer{display:none}
  .grade-group{width:100%;justify-content:space-between}
  .grade-btn{flex:1;justify-content:center}
  .count-grid{grid-template-columns:repeat(4,1fr)}
  .filter-row{gap:7px}
  .select{max-width:100%;flex:1}
  .search-box{max-width:none;flex-basis:100%}
  .q-item{padding:12px 13px;gap:9px}
  .q-item .q-index{width:24px;font-size:10px}
  .q-item .q-text{font-size:13.5px}
  .q-item .q-right{display:none}
  .section-head{margin:22px 0 10px}
  .memory-bar{max-height:76px;overflow:auto}
}
@media(max-width:380px){
  .count-grid{grid-template-columns:repeat(3,1fr)}
  .stat b{font-size:21px}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

.sync-badge{font-size:10.5px;color:var(--muted);margin-top:6px;letter-spacing:.02em;opacity:.9}


/* 记忆点提示（未看答案时点“模糊”） */
.answer-hidden.hint-mode{border-style:solid;border-color:rgba(169,130,44,.42);background:linear-gradient(180deg,rgba(216,193,138,.16),rgba(255,253,248,.45))}
.answer-hidden.hint-mode b{font-size:12px;letter-spacing:.22em;color:var(--accent);margin-bottom:6px}
.hint-kws{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:8px 0 10px}
.hint-kw{display:inline-block;padding:3px 13px;border-radius:999px;background:rgba(169,130,44,.18);color:var(--ink);font-size:14px;letter-spacing:.02em}