/* ============================================================
   lab.css —— 练习册共用样式（词汇 / 精读 / 作文 / 代码 / 小说 / 绘画）
   与 doc.css 同一套配色，独立加载，不依赖 index.html
   ============================================================ */
:root{
  --bg:#0b0f14; --card:#131a22; --card2:#0f151c; --line:#1f2a36;
  --txt:#e6edf5; --dim:#8a9bb0; --dim2:#5f7185;
  --en:#4ade80; --code:#60a5fa; --draw:#f472b6; --novel:#c084fc;
  --warn:#fbbf24; --bad:#f87171; --ok:#34d399;
  --r:14px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--txt);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  padding:0 0 40px; overflow-x:hidden;
}
.mono{font-family:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace}

/* ---------- 顶栏 ---------- */
.lab-h{
  position:sticky; top:0; z-index:20;
  background:rgba(11,15,20,.92); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  padding:10px 14px; display:flex; align-items:center; gap:10px;
}
.lab-h .back{
  color:var(--dim); text-decoration:none; font-size:13px;
  border:1px solid var(--line); border-radius:999px; padding:5px 11px; flex:0 0 auto;
}
.lab-h .back:active{background:var(--card2)}
.lab-h h1{font-size:15px;margin:0;font-weight:600;flex:1;min-width:0;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lab-h .stat{font-size:12px;color:var(--dim);flex:0 0 auto;font-variant-numeric:tabular-nums}

/* ---------- 容器 ---------- */
.wrap{max-width:760px;margin:0 auto;padding:16px 14px 0}
.lead{color:var(--dim);font-size:13.5px;line-height:1.7;margin:0 0 14px}
.lead b{color:var(--txt)}
.h2{display:flex;align-items:center;gap:9px;margin:26px 0 12px;font-size:14px;font-weight:600}
.h2::before{content:"";width:3px;height:15px;border-radius:2px;background:var(--en)}
.h2 em{font-style:normal;font-size:12px;color:var(--dim2);font-weight:400}
.h2.code::before{background:var(--code)}
.h2.draw::before{background:var(--draw)}
.h2.novel::before{background:var(--novel)}

/* ---------- 子页签 ---------- */
.subtabs{display:flex;gap:6px;margin:14px 0 4px;overflow-x:auto;scrollbar-width:none}
.subtabs::-webkit-scrollbar{display:none}
.subtabs button{
  flex:0 0 auto;background:var(--card2);border:1px solid var(--line);color:var(--dim);
  padding:8px 14px;border-radius:999px;font-size:13px;cursor:pointer;font-family:inherit;
}
.subtabs button.on{background:#17301f;border-color:#2f6b45;color:var(--en)}
.subtabs button:active{transform:scale(.97)}

/* ---------- 卡片 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px;margin:12px 0}
.card.flat{background:var(--card2);padding:12px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  background:var(--card2);border:1px solid var(--line);color:var(--txt);
  padding:10px 16px;border-radius:10px;font-size:14px;font-family:inherit;
  cursor:pointer;min-height:42px;
}
.btn:active{transform:scale(.98);background:#182230}
.btn.primary{background:#17301f;border-color:#2f6b45;color:var(--en)}
.btn.code{background:#12233a;border-color:#2b4d75;color:var(--code)}
.btn.draw{background:#331b28;border-color:#7a3b57;color:var(--draw)}
.btn.ghost{background:transparent}
.btn.sm{padding:6px 11px;min-height:34px;font-size:12.5px;border-radius:8px}
.btn:disabled{opacity:.45}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}
.row4{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}

/* ---------- 词汇卡 ---------- */
.wtop{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--dim);margin-bottom:10px}
.wbar{height:4px;background:var(--line);border-radius:999px;overflow:hidden;margin:8px 0 16px}
.wbar i{display:block;height:100%;background:var(--en);border-radius:999px;transition:width .25s}
.wcard{
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:26px 18px 20px;text-align:center;min-height:210px;
  display:flex;flex-direction:column;justify-content:center;gap:8px;
}
.wcard.show-zh{background:linear-gradient(180deg,#16241b,#131a22)}
.wcard .w{font-size:32px;font-weight:600;letter-spacing:.4px;word-break:break-word;line-height:1.25}
.wcard .ph{font-size:13px;color:var(--dim2)}
.wcard .m{font-size:15px;color:var(--en);min-height:22px}
.wcard .ex{font-size:13px;color:var(--dim);line-height:1.6;margin-top:4px}
.wcard .ex b{color:var(--txt);font-weight:500}
.wtags{display:flex;justify-content:center;gap:6px;flex-wrap:wrap;margin-top:8px}
.tag{font-size:11px;padding:2px 8px;border-radius:999px;border:1px solid var(--line);color:var(--dim2)}
.tag.en{color:var(--en);border-color:#2a5a3c}
.tag.bad{color:var(--bad);border-color:#5d2c2c}
.tag.warn{color:var(--warn);border-color:#5c4a1c}
.judge{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.judge button{min-height:52px;font-size:15px}

/* ---------- 句子 ---------- */
.sent{
  background:var(--card2);border:1px solid var(--line);border-radius:11px;
  padding:11px 13px;margin:9px 0;cursor:pointer;
}
.sent:active{border-color:#2c4a37}
.sent.open{background:#141f18;border-color:#2a5a3c}
.sent .en{font-size:15px;line-height:1.75;letter-spacing:.1px}
.sent .zh{
  display:none;color:var(--en);font-size:14px;line-height:1.75;
  margin-top:9px;padding-top:9px;border-top:1px dashed #2a5a3c;
}
.sent.open .zh{display:block}
.sent .no{color:var(--dim2);font-size:11px;margin-right:6px;font-variant-numeric:tabular-nums}
w,uw{font-style:normal}
uw{color:#fbbf24;border-bottom:1px dashed #7a6320;padding-bottom:1px}
uw.old{color:#f87171;border-bottom-color:#7a2f2f}
uw.done{color:#4ade80;border-bottom-color:#2a5a3c}
.sent .hint{display:none;margin-top:8px;font-size:12px;color:var(--dim)}
.sent.open .hint{display:block}
.sent .hint i{color:var(--warn);font-style:normal}
.sent .hint s{color:var(--bad);text-decoration:none}
.art-meta{display:flex;gap:8px;flex-wrap:wrap;font-size:11.5px;color:var(--dim2);margin-bottom:10px}
.art-title{font-size:19px;font-weight:600;margin:2px 0 4px;line-height:1.35}
.art-sub{font-size:12.5px;color:var(--dim2);margin-bottom:14px}

/* ---------- 题目 ---------- */
.q{margin:16px 0}
.q .q-t{font-size:14px;margin-bottom:8px;line-height:1.6}
.q .opts{display:grid;gap:8px}
.q .opts button{
  text-align:left;background:var(--card2);border:1px solid var(--line);color:var(--txt);
  padding:11px 13px;border-radius:10px;font-family:inherit;font-size:14px;cursor:pointer;line-height:1.5;
}
.q .opts button:active{transform:scale(.99)}
.q .opts button.right{background:#14301f;border-color:#34a35c;color:#8ef0b0}
.q .opts button.wrong{background:#301717;border-color:#a33b3b;color:#f3a3a3}
.q .fb{margin-top:9px;font-size:13px;color:var(--dim);line-height:1.7;display:none}
.q .fb.show{display:block}
.q .fb b{color:var(--en)}
textarea{
  width:100%;background:var(--card2);border:1px solid var(--line);border-radius:10px;
  color:var(--txt);padding:11px 12px;font:14px/1.7 inherit;font-family:inherit;
  resize:vertical;min-height:88px;outline:none;
}
textarea:focus{border-color:#2f6b45}
textarea.mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:13px;line-height:1.6}
.saved{font-size:11.5px;color:var(--ok);margin-top:6px;height:14px}

/* ---------- 作文 ---------- */
.essay-q{font-size:16px;font-weight:600;line-height:1.5;margin:0 0 6px}
.essay-req{font-size:13px;color:var(--dim);line-height:1.7;margin-bottom:12px}
.kv{display:grid;grid-template-columns:64px 1fr;gap:8px 10px;font-size:13.5px;line-height:1.7}
.kv b{color:var(--dim2);font-weight:400}
.kv span{color:var(--txt)}
.pat{background:var(--card2);border-left:2px solid var(--en);border-radius:0 8px 8px 0;
  padding:8px 11px;margin:7px 0;font-size:13.5px;line-height:1.65;color:#cfe6d8}
.pat i{color:var(--dim2);font-style:normal;font-size:12px;display:block;margin-top:3px}
details{border:1px solid var(--line);border-radius:11px;padding:0 13px;margin:10px 0;background:var(--card2)}
details summary{cursor:pointer;padding:11px 0;font-size:13.5px;color:var(--en);list-style:none;user-select:none}
details summary::-webkit-details-marker{display:none}
details summary::before{content:"▸ ";color:var(--dim2)}
details[open] summary::before{content:"▾ "}
details .dbody{padding:0 0 13px;font-size:13.5px;line-height:1.75;color:var(--dim)}
details .dbody b{color:var(--txt)}

/* ---------- 代码 ---------- */
.lab-grid{display:grid;grid-template-columns:1fr;gap:12px}
.task-t{font-size:16px;font-weight:600;margin:0 0 4px}
.task-g{font-size:13px;color:var(--dim);line-height:1.7}
.steps-l{counter-reset:s;list-style:none;padding:0;margin:12px 0}
.steps-l li{position:relative;padding:0 0 12px 30px;font-size:13.5px;line-height:1.7;color:var(--dim)}
.steps-l li::before{
  counter-increment:s;content:counter(s);
  position:absolute;left:0;top:1px;width:19px;height:19px;border-radius:50%;
  background:#12233a;color:var(--code);font-size:11px;
  display:flex;align-items:center;justify-content:center;
}
.steps-l li b{color:var(--txt)}
.editor{
  width:100%;min-height:230px;background:#0a1017;border:1px solid #22303f;border-radius:10px;
  color:#c8e1ff;padding:12px;font:13px/1.6 ui-monospace,Consolas,monospace;
  resize:vertical;outline:none;tab-size:2;white-space:pre;overflow-wrap:normal;overflow-x:auto;
}
.editor:focus{border-color:#2b4d75}
.preview{
  width:100%;height:230px;border:1px solid #22303f;border-radius:10px;background:#fff;
  display:block;
}
.ck{display:grid;gap:6px;margin:10px 0}
.ck label{display:flex;gap:9px;align-items:flex-start;font-size:13px;color:var(--dim);line-height:1.6;cursor:pointer}
.ck input{margin:3px 0 0;width:16px;height:16px;accent-color:#34a35c;flex:0 0 auto}
.ck input:checked + span{color:var(--ok);text-decoration:line-through;text-decoration-color:#2a5a3c}

/* ---------- 小说 ---------- */
.story{font-size:15px;line-height:1.95;letter-spacing:.2px;color:#dde6f0}
.story p{margin:0 0 14px;text-indent:2em}
.story .mark{background:#2a1f36;border-radius:3px;padding:0 2px}
.story-t{font-size:19px;font-weight:600;margin:0 0 2px}
.story-m{font-size:12px;color:var(--dim2);margin-bottom:16px}
.el{display:grid;gap:5px;margin:8px 0 12px}
.el label{font-size:12.5px;color:var(--dim);display:flex;gap:7px;align-items:center}
.el input[type=checkbox]{width:15px;height:15px;accent-color:#34a35c}

/* ---------- 画布 ---------- */
.cv-wrap{position:relative;width:100%;aspect-ratio:1/1;background:#151b23;border:1px solid var(--line);border-radius:12px;overflow:hidden;touch-action:none}
.cv-wrap.grid{background-image:
  repeating-linear-gradient(0deg,#26313e 0 1px,transparent 1px 32px),
  repeating-linear-gradient(90deg,#26313e 0 1px,transparent 1px 32px)}
.cv-wrap.guide::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(to top right,transparent calc(50% - .5px),#33414f 50%,transparent calc(50% + .5px)),
    linear-gradient(to bottom right,transparent calc(50% - .5px),#33414f 50%,transparent calc(50% + .5px));
}
.cv-wrap canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none}
.cv-tools{display:flex;gap:7px;flex-wrap:wrap;margin:10px 0}
.cv-tools button{
  background:var(--card2);border:1px solid var(--line);color:var(--dim);
  border-radius:9px;padding:8px 12px;font-size:12.5px;font-family:inherit;cursor:pointer;min-height:38px;
}
.cv-tools button.on{background:#331b28;border-color:#7a3b57;color:var(--draw)}
.cv-tools button:active{transform:scale(.97)}
.dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:currentColor;margin-right:4px;vertical-align:-1px}

/* ---------- 杂项 ---------- */
.note{border-radius:11px;padding:11px 13px;font-size:13px;line-height:1.7;margin:12px 0;
  border:1px solid var(--line);background:var(--card2);color:var(--dim)}
.note b{color:var(--txt)}
.note.warn{border-color:#5c4a1c;background:#1d1808}
.note.warn b{color:var(--warn)}
.note.ok{border-color:#265a3d;background:#0d1f16}
.note.ok b{color:var(--en)}
.note.bad{border-color:#5d2c2c;background:#1e0f0f}
.note.bad b{color:var(--bad)}
.foot-l{margin:34px 0 0;padding-top:16px;border-top:1px solid var(--line);
  font-size:12px;color:var(--dim2);line-height:1.8}
.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);
  background:#1c2632;border:1px solid var(--line);color:var(--txt);
  padding:10px 18px;border-radius:999px;font-size:13px;opacity:0;
  transition:.25s;pointer-events:none;z-index:99;max-width:86vw;text-align:center;
}
.toast.on{opacity:1;transform:translate(-50%,0)}
.hide{display:none !important}