/* 小学知识点体系 —— 纯静态样式，无外部依赖 */
:root{
  --bg:#f5f7fb;
  --panel:#ffffff;
  --ink:#1b2230;
  --ink-2:#3d4657;
  --muted:#6b7686;
  --line:#e2e7ee;
  --line-2:#cfd7e2;
  --chinese:#c2410c;
  --math:#2563eb;
  --english:#0f766e;
  --accent:#2563eb;
  --accent-soft:#eaf0ff;
  --hot:#c2410c;
  --hot-soft:#fff2e8;
  --radius:9px;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:14px;
  line-height:1.62;
}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
::selection{background:#d8e3ff;}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:30;
  background:rgba(255,255,255,.95);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1360px;margin:0 auto;
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;row-gap:6px;
  padding:8px 18px;min-height:56px;
}
.menu-btn{
  display:none;width:34px;height:32px;border:1px solid var(--line-2);
  background:#fff;border-radius:6px;padding:0;cursor:pointer;
  flex-direction:column;justify-content:center;align-items:center;gap:3px;
}
.menu-btn span{display:block;width:15px;height:2px;background:var(--ink-2);border-radius:1px;}
.brand{display:flex;align-items:center;gap:9px;flex:0 0 auto;}
.brand-mark{
  width:28px;height:28px;border-radius:8px;
  background:linear-gradient(135deg,#2563eb,#0f766e);
  color:#fff;font-weight:700;font-size:15px;
  display:grid;place-items:center;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text b{font-size:15px;letter-spacing:.2px;}
.brand-text i{font-style:normal;font-size:11px;color:var(--muted);letter-spacing:.3px;}
.exams{display:flex;gap:2px;padding:3px;background:#eef1f6;border:1px solid var(--line-2);border-radius:7px;}
.exam-tab{
  display:flex;align-items:center;gap:5px;padding:5px 9px;border-radius:5px;
  font-size:12.5px;font-weight:700;color:var(--ink-2);white-space:nowrap;
}
.exam-tab i{font-style:normal;font-size:10.5px;font-weight:400;color:var(--muted);}
.exam-tab:hover{background:#e4e9f2;}
.exam-tab.on{background:#fff;color:var(--accent);box-shadow:0 1px 3px rgba(16,24,40,.09);}
.exam-tab.past-tab b{color:#1e3a8a;}
.exam-tab.past-tab.on{background:#eef2ff;}
.subjects{display:flex;gap:4px;padding:3px;background:#eef1f6;border-radius:7px;flex-wrap:wrap;}
.subjects a{
  padding:5px 14px;border-radius:5px;font-size:13px;font-weight:600;color:var(--ink-2);
  display:flex;align-items:center;gap:6px;white-space:nowrap;
}
.subjects a i{font-style:normal;font-size:11px;color:var(--muted);font-weight:400;}
.subjects a.on{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(16,24,40,.09);}
.subjects a[data-s="chinese"].on{color:var(--chinese);}
.subjects a[data-s="math"].on{color:var(--math);}
.subjects a[data-s="english"].on{color:var(--english);}
.search-box{margin-left:auto;position:relative;display:flex;align-items:center;}
.search-box input{
  width:270px;max-width:44vw;padding:7px 52px 7px 30px;
  border:1px solid var(--line-2);border-radius:7px;background:#fff;
  font-size:13px;color:var(--ink);outline:none;
}
.search-box input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.12);}
.search-box kbd{
  position:absolute;right:8px;font-family:var(--mono);font-size:10px;
  color:var(--muted);border:1px solid var(--line);background:#f7f8fa;
  padding:1px 4px;border-radius:4px;pointer-events:none;
}
.search-box::before{
  content:"";position:absolute;left:10px;width:12px;height:12px;pointer-events:none;
  border:2px solid #97a1b2;border-radius:50%;transform:translateY(-1px);
}
.search-box::after{
  content:"";position:absolute;left:20px;top:22px;width:6px;height:2px;pointer-events:none;
  background:#97a1b2;transform:rotate(45deg);
}
.search-panel{
  position:absolute;top:calc(100% + 8px);right:0;width:min(560px,90vw);
  max-height:60vh;overflow:auto;background:#fff;border:1px solid var(--line-2);
  border-radius:9px;box-shadow:0 12px 32px rgba(16,24,40,.14);z-index:40;padding:6px;
}
.search-item{
  display:block;padding:7px 9px;border-radius:6px;cursor:pointer;border:0;background:none;
  text-align:left;width:100%;font-size:13px;line-height:1.45;
}
.search-item:hover{background:#f1f5fd;}
.search-item .si-title{font-weight:600;color:var(--ink);}
.search-item .si-meta{font-size:11.5px;color:var(--muted);margin-top:1px;}
.search-empty{padding:14px;color:var(--muted);font-size:13px;text-align:center;}

/* ---------- 布局 ---------- */
.layout{
  max-width:1360px;margin:0 auto;
  display:grid;grid-template-columns:266px minmax(0,1fr);
  gap:0;align-items:start;
}
.sidebar{
  position:sticky;top:57px;height:calc(100vh - 57px);
  display:flex;flex-direction:column;
  border-right:1px solid var(--line);background:#fbfcfd;
}
.sidebar-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 12px 8px;border-bottom:1px solid var(--line);
  font-size:12px;font-weight:700;letter-spacing:.6px;color:var(--muted);
}
.sidebar-close{display:none;border:0;background:none;font-size:18px;color:var(--muted);cursor:pointer;line-height:1;padding:0 2px;}
.tree{flex:1;overflow-y:auto;padding:8px 6px 30px;overscroll-behavior:contain;}
.tree::-webkit-scrollbar{width:8px;}
.tree::-webkit-scrollbar-thumb{background:#d5dbe4;border-radius:4px;}
.tree-sub{padding:3px 8px 8px;border-bottom:1px dashed var(--line);margin-bottom:6px;}
.tree-sub-name{display:block;font-size:13px;font-weight:800;color:var(--ink);}
.tree-sub-ed{display:block;font-size:10.5px;color:var(--muted);line-height:1.4;margin-top:1px;}
.tree-empty{padding:14px 10px;font-size:11.5px;color:var(--muted);text-align:center;line-height:1.6;}
.tree-book{
  display:flex;align-items:center;gap:6px;width:100%;
  padding:7px 8px;border:0;background:none;cursor:pointer;border-radius:6px;
  font-size:13px;font-weight:700;color:var(--ink);text-align:left;
}
.tree-book:hover{background:#eef1f6;}
.tree-book .caret{font-size:10px;color:var(--muted);transition:transform .15s;width:10px;}
.tree-book.open .caret{transform:rotate(90deg);}
.tree-book .cnt{margin-left:auto;font-size:11px;color:var(--muted);font-weight:400;}
.tree-units{display:none;padding-left:6px;}
.tree-units.open{display:block;}
.tree-unit{
  display:flex;align-items:center;gap:5px;width:100%;
  padding:5px 8px;border:0;background:none;cursor:pointer;border-radius:5px;
  font-size:12.5px;color:var(--ink-2);text-align:left;line-height:1.4;
}
.tree-unit:hover{background:#eef1f6;}
.tree-unit.on{background:var(--accent-soft);color:var(--accent);font-weight:600;}
.tree-points{display:none;padding-left:14px;}
.tree-points.open{display:block;}
.tree-point{
  display:block;width:100%;padding:3px 8px;border:0;background:none;cursor:pointer;
  font-size:12px;color:var(--muted);text-align:left;border-radius:4px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.tree-point:hover{color:var(--ink);background:#eef1f6;}
.tree-point.on{color:var(--accent);background:#e8f0ff;}
.tree-point.hot::after{content:"重点";font-size:9.5px;color:var(--hot);margin-left:5px;vertical-align:1px;}
.sidebar-foot{
  border-top:1px solid var(--line);padding:7px 12px;font-size:11.5px;color:var(--muted);
  display:flex;justify-content:space-between;gap:8px;background:#fbfcfd;
}
.foot-link{color:var(--accent);}
/* 关键：基础状态隐藏，只有非 hidden 时才显示，避免窄屏全屏吞掉点击 */
.scrim{display:none;}

.content{min-width:0;padding:18px 22px 64px;}

/* ---------- 通用块 ---------- */
.crumbs{font-size:12px;color:var(--muted);margin-bottom:10px;display:flex;gap:6px;flex-wrap:wrap;align-items:center;}
.crumbs a:hover{color:var(--accent);text-decoration:underline;}
.crumbs .sep{color:#b8c0cd;}

.page-head{margin-bottom:14px;}
.page-head h1{font-size:23px;line-height:1.3;margin:0 0 6px;letter-spacing:-.2px;}
.page-head .sub{color:var(--muted);font-size:12.5px;margin:0;}
.page-head .sub b{color:var(--ink-2);}
.page-intro{color:var(--muted);font-size:12.5px;margin:0;}
.meta-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:9px;}
.meta-chip{
  font-size:11.5px;padding:2px 8px;border-radius:4px;
  background:#fff;border:1px solid var(--line-2);color:var(--ink-2);
}
.meta-chip.warn{background:#fffbeb;border-color:#fde68a;color:#92400e;}
.meta-chip.practice{background:#eef5f1;border-color:#cfe0d7;color:#3f6152;}
.src-line{margin:5px 0 0;font-size:11px;line-height:1.6;color:var(--muted);}
.book-verdict{margin:5px 0 0;font-size:11.5px;line-height:1.7;color:var(--muted);}
.book-verdict::before{content:"";display:inline-block;width:5px;height:5px;margin:0 6px 1px 0;
  border-radius:50%;background:#b9bec7;vertical-align:middle;}
.unit-note{margin:7px 0 0;font-size:11.5px;line-height:1.75;color:var(--muted);}
.unit-note b{color:var(--ink-2);font-weight:600;}
.chiprow{display:flex;gap:6px;flex-wrap:wrap;margin-top:9px;}
.chip{
  display:inline-flex;align-items:center;gap:4px;
  font-size:11.5px;padding:2px 8px;border-radius:20px;
  background:#eef1f6;color:var(--ink-2);border:1px solid transparent;white-space:nowrap;
}
.chip.hot{background:var(--hot-soft);color:var(--hot);border-color:#fed7c3;}
.chip.demo{background:#eaf7f2;color:#0b6b52;border-color:#c6e9da;}
.chip.plain{background:#fff;border-color:var(--line-2);}
.chip.xs{font-size:10px;padding:0 5px;margin-left:5px;}

.panel{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 16px;margin-bottom:14px;
}
.panel h2{font-size:15px;margin:0 0 10px;}
.panel h3{font-size:13px;margin:0 0 6px;color:var(--ink-2);}
.note-panel p{margin:0 0 7px;color:var(--ink-2);font-size:12.8px;}
.note-panel p:last-child{margin-bottom:0;}
.note-panel kbd{font-family:var(--mono);font-size:10.5px;border:1px solid var(--line);background:#f7f8fa;border-radius:3px;padding:0 4px;}

.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-bottom:16px;}
.kpi{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:11px 13px;}
.kpi .v{font-size:24px;font-weight:700;line-height:1.15;font-variant-numeric:tabular-nums;}
.kpi .l{font-size:11.5px;color:var(--muted);margin-top:2px;}

.sec-head{display:flex;align-items:baseline;gap:9px;margin:0 0 9px;flex-wrap:wrap;}
.sec-head h2{font-size:15px;margin:0;}
.sec-head h2::before{content:"";display:inline-block;width:3px;height:13px;background:var(--accent);border-radius:2px;margin-right:7px;vertical-align:-2px;}
.sec-hint{font-size:11.5px;color:var(--muted);}
.home-sec{margin:0 0 18px;}

/* ---------- 首页 ---------- */
.hero{margin:2px 0 14px;}
.hero h1{font-size:23px;margin:0 0 5px;letter-spacing:.4px;}
.hero-sub{margin:0 0 12px;color:var(--muted);font-size:12.5px;line-height:1.6;}
.grade-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:12px;margin-bottom:18px;}
.grade-card{
  display:flex;flex-direction:column;gap:8px;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:14px 16px 12px;border-top:3px solid var(--accent);
}
.grade-card:hover{border-color:#c3d0e6;box-shadow:0 6px 18px rgba(16,24,40,.06);}
.gc-top{display:flex;align-items:center;gap:8px;}
.gc-top h2{font-size:17px;margin:0;}
.gc-badge{
  width:24px;height:24px;border-radius:7px;display:grid;place-items:center;
  font-size:13px;font-weight:800;color:#fff;background:var(--accent);
}
.gc-tag{margin-left:auto;font-size:11px;color:var(--muted);background:#f2f5f9;border:1px solid var(--line);border-radius:4px;padding:1px 7px;}
.gc-desc{margin:0;font-size:12.5px;color:var(--ink-2);line-height:1.6;}
.gc-subjects{display:flex;flex-wrap:wrap;gap:6px;}
.gc-subj{
  display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:600;
  border:1px solid var(--line);border-left:3px solid var(--sc,#2563eb);border-radius:5px;
  padding:2px 8px;color:var(--ink-2);background:#fbfcfd;
}
.gc-subj i{font-style:normal;font-weight:400;font-size:11px;color:var(--muted);}
.gc-foot{font-size:11.5px;color:var(--muted);border-top:1px dashed var(--line);padding-top:7px;}
.gc-go{font-size:12.5px;font-weight:700;color:var(--accent);}

/* ---------- 年级 / 科目总览 ---------- */
.overview-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:12px;}
.subject-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 16px;border-top:3px solid var(--accent);
}
.subject-card.c-chinese{border-top-color:var(--chinese);}
.subject-card.c-math{border-top-color:var(--math);}
.subject-card.c-english{border-top-color:var(--english);}
.subject-card h3{margin:0 0 2px;font-size:16px;}
.subject-card .meta{font-size:11.5px;color:var(--muted);margin-bottom:9px;}
.subject-card .books{display:flex;flex-wrap:wrap;gap:5px;}
.subject-card .books a{
  font-size:11.5px;padding:2.5px 8px;border-radius:4px;background:#f1f4f8;
  color:var(--ink-2);border:1px solid var(--line);
}
.subject-card .books a:hover{background:var(--accent-soft);border-color:#c9d8ff;color:var(--accent);}
.scope-note{
  margin-top:10px;background:#f0faf6;border:1px solid #cfe9df;border-left:3px solid #0f766e;
  border-radius:0 7px 7px 0;padding:9px 12px;
}
.scope-note b{display:block;font-size:12px;color:#0b4f3a;margin-bottom:2px;letter-spacing:.4px;}
.scope-note p{margin:0;font-size:12.5px;color:#245b4d;line-height:1.65;}

.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px;}
.book-tile{
  display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:12px 13px;transition:border-color .15s,transform .15s;
}
.book-tile:hover{border-color:#c3d0e6;transform:translateY(-1px);}
.book-tile .bt-name{font-weight:700;font-size:13.5px;margin-bottom:2px;}
.book-tile .bt-meta{font-size:11.5px;color:var(--muted);}
.book-tile .bt-bars{display:flex;gap:2px;margin-top:8px;flex-wrap:wrap;}
.book-tile .bt-bars i{display:block;width:14px;height:4px;border-radius:1px;background:#e6ebf2;}
.book-tile .bt-bars i.hot{background:#f3b48f;}

/* ---------- 单元卡片 ---------- */
.unit-list{display:grid;gap:9px;}
.unit-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:11px 13px;}
.unit-card .uc-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.uc-no{font-family:var(--mono);font-size:11px;color:#a5aebc;}
.uc-title{font-size:13.5px;font-weight:700;}
.uc-title:hover{color:var(--accent);}
.uc-count{font-size:11.5px;color:var(--muted);margin-left:auto;}
.uc-check{
  font-size:10px;line-height:1.5;color:#92400e;background:#fffbeb;
  border:1px solid #fde68a;border-radius:3px;padding:0 4px;white-space:nowrap;
}
.uc-kind{
  font-size:10px;line-height:1.5;color:#3f6152;background:#eef5f1;
  border:1px solid #cfe0d7;border-radius:3px;padding:0 4px;white-space:nowrap;
}
.uc-points{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px;}
.uc-point{
  font-size:11.5px;color:var(--ink-2);border:1px solid var(--line);background:#f8fafc;
  border-radius:4px;padding:2px 8px;display:inline-flex;align-items:center;gap:4px;
}
.uc-point:hover{background:var(--accent-soft);border-color:#c9d8ff;color:var(--accent);}
.uc-point.hot{border-color:#f6d3bd;background:#fff7f2;}

/* ---------- 知识点卡片 ---------- */
.point-list{display:grid;gap:10px;}
.point-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:13px 15px;scroll-margin-top:70px;
}
.point-card.hot-card{border-left:3px solid #e58c5c;}
.point-card .pc-head{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;margin-bottom:5px;}
.point-card .pc-head h3{margin:0;font-size:15px;font-weight:700;}
.point-card .pc-head .no{font-family:var(--mono);font-size:11px;color:#a5aebc;}
.pc-field{margin-top:7px;}
.pc-field .fk{
  font-size:11px;font-weight:700;letter-spacing:.5px;color:var(--muted);
  display:inline-block;margin-bottom:1px;
}
.pc-field p{margin:0;color:var(--ink-2);font-size:13px;}
.pc-field ul,.pc-field ol{margin:2px 0 0;padding-left:18px;color:var(--ink-2);font-size:13px;}
.pc-field ul li,.pc-field ol li{margin:2px 0;}
.pc-field.traps ul li::marker{color:var(--hot);}
.fx{
  font-family:var(--mono);font-size:12.5px;background:#f6f8fb;
  border:1px solid #e8ecf3;border-radius:4px;padding:1px 5px;color:#243043;
  display:inline-block;margin:1px 2px 1px 0;line-height:1.7;
}
/* 例题 */
.pc-example{
  margin-top:10px;background:#f8fbff;border:1px solid #dbe7fb;border-left:3px solid #2563eb;
  border-radius:0 7px 7px 0;padding:9px 12px;
}
.pc-example .ex-label{
  display:inline-block;font-size:10.5px;font-weight:700;letter-spacing:.5px;
  color:#1e40af;background:#e3edff;border-radius:3px;padding:1px 7px;margin-bottom:4px;
}
.pc-example .ex-q{margin:0;font-size:13px;color:var(--ink);line-height:1.7;}
.pc-example details{margin-top:6px;}
.pc-example summary{cursor:pointer;font-size:12.5px;font-weight:600;color:#1e40af;outline:none;}
.pc-example .ex-a{margin:6px 0 0;font-size:13px;font-weight:600;color:#0b4f3a;}
.pc-example .ex-steps{margin:4px 0 0;padding-left:20px;font-size:12.5px;color:var(--ink-2);line-height:1.7;}
.pc-example .ex-steps li{margin-bottom:2px;}
.pc-demos{display:flex;flex-wrap:wrap;gap:6px;margin-top:9px;}
.pc-demo-link{
  display:inline-flex;align-items:center;gap:5px;
  font-size:12px;color:#0b6b52;background:#eaf7f2;border:1px solid #c6e9da;
  border-radius:5px;padding:3px 9px;cursor:pointer;font-family:inherit;
}
.pc-demo-link:hover{background:#dcf0e7;}

/* ---------- 演示区 ---------- */
.demo-section{margin:16px 0 18px;}
.demo-section .ds-head{display:flex;align-items:center;gap:8px;margin-bottom:8px;flex-wrap:wrap;}
.demo-section .ds-head h2{font-size:15px;margin:0;}
.demo-section .ds-head .tag{font-size:11px;color:#0b6b52;background:#eaf7f2;padding:1px 7px;border-radius:20px;}
.demo-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(420px,1fr));gap:12px;}
.demo-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;
}
.demo-card .dc-head{padding:10px 13px 8px;border-bottom:1px solid var(--line);}
.demo-card .dc-head h3{margin:0;font-size:14px;}
.demo-card .dc-head .dc-sub{font-size:11.5px;color:var(--muted);margin-top:1px;}
.demo-card .dc-body{padding:10px 12px 13px;display:flex;flex-direction:column;gap:9px;}
.demo-guide{
  font-size:12.5px;color:#0b4f3a;background:#f0faf5;border:1px solid #d3ede0;
  border-left:3px solid #16a34a;border-radius:0 6px 6px 0;padding:7px 10px;line-height:1.6;
}
.demo-readout{
  display:flex;flex-wrap:wrap;gap:6px;font-family:var(--mono);font-size:11.5px;
  color:var(--ink-2);
}
.demo-readout span{background:#f4f6fa;border:1px solid #e6eaf1;border-radius:4px;padding:1px 6px;}
.demo-host{display:flex;flex-direction:column;gap:9px;}
.ds-tag{font-size:10.5px;font-weight:400;color:#0b6b52;background:#eaf7f2;border-radius:3px;padding:1px 6px;margin-left:7px;}
/* 演示引擎 K.* 生成的结构 */
.dk-stage{position:relative;width:100%;border-radius:6px;background:#fcfdfe;border:1px solid #e9edf3;overflow:hidden;touch-action:none;}
.dk-stage canvas{display:block;width:100%;height:100%;cursor:default;}
.dk-hint{
  position:absolute;left:8px;bottom:7px;font-size:10.5px;color:#8b95a5;
  background:rgba(255,255,255,.85);padding:1px 6px;border-radius:4px;pointer-events:none;
}
.dk-controls{display:grid;gap:7px;}
.dk-row{display:grid;grid-template-columns:88px minmax(0,1fr) 62px;align-items:center;gap:8px;font-size:12px;}
.dk-row.single{grid-template-columns:88px minmax(0,1fr);}
.dk-row label{color:var(--ink-2);font-weight:600;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.dk-row output{
  font-family:var(--mono);font-size:11.5px;color:var(--accent);
  background:#f2f6ff;border:1px solid #dbe5f8;border-radius:4px;
  text-align:center;padding:1px 2px;font-variant-numeric:tabular-nums;
}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:18px;background:transparent;margin:0;cursor:pointer;}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:#dfe5ee;}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:#fff;border:2px solid var(--accent);margin-top:-5px;
  box-shadow:0 1px 3px rgba(16,24,40,.2);
}
input[type=range]::-moz-range-track{height:4px;border-radius:2px;background:#dfe5ee;}
input[type=range]::-moz-range-thumb{width:12px;height:12px;border:2px solid var(--accent);background:#fff;border-radius:50%;}
.dk-selects{display:flex;flex-wrap:wrap;gap:6px;align-items:center;}
.dk-seg{display:inline-flex;border:1px solid var(--line-2);border-radius:6px;overflow:hidden;background:#fff;}
.dk-seg button{border:0;background:none;padding:4px 10px;font-size:12px;cursor:pointer;color:var(--ink-2);border-right:1px solid var(--line);}
.dk-seg button:last-child{border-right:0;}
.dk-seg button.on{background:var(--accent);color:#fff;}
.dk-btn{border:1px solid var(--line-2);background:#fff;border-radius:5px;padding:4px 10px;font-size:12px;cursor:pointer;color:var(--ink-2);}
.dk-btn:hover{background:#f2f5fa;}
.dk-btn.on{background:var(--accent);color:#fff;border-color:var(--accent);}
.demo-fail{font-size:12.5px;color:#b42318;background:#feeceb;border-radius:5px;padding:6px 9px;}

/* ---------- 高频速览 ---------- */
.hot-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:7px;}
.hot-item{
  display:flex;flex-direction:column;gap:1px;background:#fff;border:1px solid var(--line);
  border-left:2px solid #e58c5c;border-radius:6px;padding:7px 10px;
}
.hot-item:hover{border-color:#c3d0e6;background:#fbfcfe;}
.hi-name{font-size:12.5px;font-weight:600;color:var(--ink);}
.hi-meta{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* ---------- 真题区（空状态） ---------- */
.past-section{margin:18px 0 14px;}
.ps-badge{font-size:11.5px;color:#1e3a8a;background:#eef2ff;border:1px solid #c9d4f5;border-radius:20px;padding:2px 9px;font-weight:600;}
.past-entry{
  display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;
  background:#f8fafc;border:1px solid var(--line);border-radius:var(--radius);padding:11px 14px;
  font-size:12.5px;color:var(--ink-2);
}
.past-entry a{color:var(--accent);font-weight:600;white-space:nowrap;}
.past-empty{
  background:#f8fafc;border:1px solid var(--line);border-radius:var(--radius);
  padding:12px 14px;font-size:12.5px;color:var(--ink-2);line-height:1.75;
}
.past-empty b{color:#b42318;}
.past-legend{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;font-size:11.5px;color:var(--muted);margin-bottom:10px;line-height:1.8;}
.pi-tag{font-size:11px;border-radius:3px;padding:1px 6px;border:1px solid transparent;white-space:nowrap;}
.pi-tag.memoir{color:#b45309;background:#fff7ed;border-color:#fed7aa;}
.pi-tag.excerpt{color:#0f766e;background:#ecfdf5;border-color:#b7e4d8;}
.pi-tag.noans{color:#475569;background:#f1f5f9;border-color:#dbe2ea;}
.pi-tag.warn{color:#b42318;background:#feeceb;border-color:#f7c9c4;font-weight:600;}
.pi-tag.ok{color:#0b6b52;background:#eaf7f2;border-color:#c6e9da;}
.past-filters{display:flex;flex-wrap:wrap;gap:10px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:9px 12px;margin-bottom:12px;}
.past-filters label{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--muted);}
.past-filters select{font-family:inherit;font-size:12.5px;color:var(--ink);background:#fff;border:1px solid var(--line-2);border-radius:5px;padding:4px 7px;outline:none;}
.pf-count{margin-left:auto;font-size:12px;color:var(--ink-2);}
.pf-reset{border:1px solid var(--line-2);background:#f7f8fa;color:var(--ink-2);font-size:12px;padding:4px 10px;border-radius:5px;cursor:pointer;}
.past-list{display:grid;gap:10px;}
.past-item{background:#fff;border:1px solid var(--line);border-left:3px solid #1e3a8a;border-radius:var(--radius);padding:12px 14px;}
.past-more{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:center;margin:14px 0;font-size:12px;color:var(--muted);}
.past-more button{border:1px solid var(--line-2);background:#fff;color:var(--accent);font-size:12.5px;font-weight:600;padding:6px 16px;border-radius:6px;cursor:pointer;}
.past-format{margin-top:10px;font-size:12.5px;color:var(--muted);}
.past-format summary{cursor:pointer;font-weight:600;color:var(--ink-2);}
.past-format p{margin:8px 0 0;line-height:1.7;}

/* 待录入 / 未开设 空状态 */
.empty-page{
  background:#fff;border:1px dashed var(--line-2);border-radius:var(--radius);
  padding:22px 18px;text-align:center;color:var(--muted);font-size:13px;line-height:1.8;
}
.empty-page b{display:block;font-size:15px;color:var(--ink);margin-bottom:4px;}
.empty{padding:40px 10px;text-align:center;color:var(--muted);}

/* ---------- 页脚 ---------- */
.foot{margin-top:26px;border-top:1px solid var(--line);padding-top:12px;color:var(--muted);font-size:11.5px;}
.foot p{margin:0 0 3px;}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .brand-text i{display:none;}
  .search-box input{width:200px;}
}
@media (max-width:1024px){
  .exams{order:5;flex:1 1 100%;overflow-x:auto;padding:3px;scrollbar-width:none;}
  .exams::-webkit-scrollbar{display:none;}
}
@media (max-width:960px){
  .menu-btn{display:flex;}
  .layout{grid-template-columns:minmax(0,1fr);}
  .sidebar{
    position:fixed;top:0;left:0;height:100dvh;width:286px;max-width:84vw;z-index:50;
    background:#fff;transform:translateX(-102%);transition:transform .22s ease;
    box-shadow:12px 0 32px rgba(16,24,40,.16);
  }
  .sidebar.open{transform:translateX(0);}
  .sidebar-close{display:block;}
  .sidebar-head{padding-top:max(10px,env(safe-area-inset-top));}
  /* 只对非 hidden 的遮罩生效，hidden 时保持 display:none */
  .scrim:not([hidden]){
    display:block;position:fixed;top:0;right:0;bottom:0;left:0;
    background:rgba(17,24,39,.36);z-index:45;
  }
  .content{padding:14px 13px 56px;}
  .brand-text b{font-size:13.5px;}
  .topbar-inner{padding:7px 11px;gap:9px;}
  .search-box{flex:1 1 100%;order:4;margin-left:0;}
  .search-box input{width:100%;max-width:none;}
  .search-box kbd{display:none;}
  .search-box::after{top:19px;}
  .subjects{margin-left:auto;order:3;}
  .subjects a{padding:5px 11px;font-size:12.5px;}
  .subjects a i{display:none;}
  .page-head h1{font-size:19px;}
  .point-card{padding:11px 12px;}
  .dk-row{grid-template-columns:76px minmax(0,1fr) 54px;gap:6px;}
}
@media (max-width:620px){
  .brand-text b{font-size:12.5px;letter-spacing:0;}
  .kpis{grid-template-columns:repeat(2,minmax(0,1fr));}
  .kpi .v{font-size:20px;}
  .grade-cards,.overview-grid,.demo-grid{grid-template-columns:1fr;}
  .hot-grid{grid-template-columns:1fr 1fr;}
  .dk-stage{height:300px !important;}
  .hero h1{font-size:18px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  html{scroll-behavior:auto;}
}