/* ============================================================
   教师资格证（中学）备考系统 · 样式表
   主题：教育蓝青渐变 #3b5bdb → #0ea5e9
   修复点：P2 强制隐藏 hidden；三档响应式（>1024 桌面 / ≤1024 平板抽屉 / ≤640 手机）
   ============================================================ */

/* ===== P2：强制隐藏（遮罩/弹窗关闭后必须真的消失） ===== */
.hidden, [hidden] { display: none !important; }

/* ===== 主题 token ===== */
:root {
  --c-primary: #3b5bdb;
  --c-primary-2: #0ea5e9;
  --c-primary-grad: linear-gradient(135deg, #3b5bdb, #0ea5e9);
  --c-success: #16a34a;
  --c-danger: #e11d48;
  --c-warn: #f59e0b;
  --c-bg: #f5f7fb;
  --c-surface: #ffffff;
  --c-surface-2: #eef2f9;
  --c-line: #e2e8f0;
  --c-text: #1e293b;
  --c-text-2: #64748b;
  --radius: 14px;
  --shadow: 0 8px 28px rgba(30, 41, 59, .08);
  --sidebar-w: 240px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}
#view { margin: 0 auto; max-width: 1100px; padding: 18px 16px 40px; }

/* ===== 顶栏 ===== */
#topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 12px;
  height: 56px; padding: 0 16px;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
}
#railToggle { display: none; font-size: 20px; background: none; border: none; cursor: pointer; color: var(--c-text); }
.app-name { font-weight: 800; font-size: 16px; background: var(--c-primary-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
#userBox { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.ub-hi { font-size: 14px; font-weight: 600; color: var(--c-text-2); }

/* ===== 布局 ===== */
#app { display: flex; align-items: flex-start; }
#sidebar {
  width: var(--sidebar-w); flex: 0 0 var(--sidebar-w);
  height: calc(100vh - 56px); position: sticky; top: 56px;
  background: var(--c-surface); border-right: 1px solid var(--c-line);
  display: flex; flex-direction: column; overflow-y: auto;
}
.brand { padding: 18px 16px 10px; font-weight: 800; font-size: 18px; line-height: 1.3; }
.brand small { display: block; font-size: 12px; font-weight: 500; color: var(--c-text-2); margin-top: 4px; }
.brand-ico { display: inline-block; font-size: 26px; line-height: 1; margin-bottom: 6px; filter: drop-shadow(0 2px 6px rgba(59,91,219,.25)); }

/* 全局科目选择器（P7） */
#subjbar { display: flex; align-items: center; gap: 8px; padding: 8px 16px; border-bottom: 1px solid var(--c-line); background: var(--c-surface-2); }
.subj-label { font-weight: 700; font-size: 13px; color: var(--c-text-2); }
.subj-select {
  flex: 1; min-height: 38px; padding: 0 10px; font-size: 14px;
  border: 1px solid var(--c-line); border-radius: 10px; background: var(--c-surface); color: var(--c-text);
}
.subj-lock { font-size: 12px; color: var(--c-primary); font-weight: 700; }

/* 导航 */
#nav { padding: 8px; flex: 1; }
.nav-item, .nav-parent {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 12px; border-radius: 10px; cursor: pointer;
  color: var(--c-text); font-size: 15px; font-weight: 600; user-select: none;
}
.nav-item:hover, .nav-parent:hover { background: var(--c-surface-2); }
.nav-item.active { background: var(--c-primary-grad); color: #fff; }
.nav-ico { font-size: 17px; }
.nav-badge {
  margin-left: auto; min-width: 20px; height: 20px; padding: 0 6px;
  border-radius: 10px; background: var(--c-danger); color: #fff; font-size: 12px;
  display: grid; place-items: center; font-weight: 700;
}
.has-sub { margin-bottom: 2px; }
.nav-caret { margin-left: auto; font-size: 12px; color: var(--c-text-2); transition: transform .2s; }
.has-sub.open > .nav-parent .nav-caret { transform: rotate(180deg); }
.nav-sub { display: none; padding: 2px 0 4px 30px; }
.has-sub.open > .nav-sub { display: block; }
.nav-child {
  padding: 8px 12px; border-radius: 8px; cursor: pointer;
  font-size: 13.5px; color: var(--c-text-2); user-select: none;
}
.nav-child:hover { background: var(--c-surface-2); color: var(--c-primary); }
.nav-empty { padding: 8px 12px; font-size: 12px; color: var(--c-text-2); }

#railOverlay { display: none; }
#main { flex: 1; min-width: 0; }

/* ===== 按钮 ===== */
.btn {
  min-height: 44px; padding: 0 18px; border: none; border-radius: 12px;
  background: var(--c-primary-grad); color: #fff; font-size: 15px; font-weight: 700; cursor: pointer;
  transition: transform .08s, box-shadow .2s;
}
.btn:hover { box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: var(--c-surface); color: var(--c-text); border: 1px solid var(--c-line); }
.btn.danger { background: var(--c-danger); }
.btn.primary { background: var(--c-primary-grad); }
.btn.tiny { min-height: 36px; padding: 0 12px; font-size: 13px; }
.btn.block { display: block; width: 100%; }

/* ===== dashboard ===== */
.login-banner {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: var(--c-primary-grad); color: #fff; border-radius: var(--radius);
  padding: 14px 18px; margin-bottom: 16px;
}
.lb-text { flex: 1; font-size: 14px; min-width: 200px; }
.login-banner .btn { background: #fff; color: var(--c-primary); }
.hero { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius); padding: 22px; margin-bottom: 18px; box-shadow: var(--shadow); }
.hero-hi { font-size: 22px; font-weight: 800; }
.hero-date { color: var(--c-text-2); margin: 6px 0 14px; }
.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
.mod-card {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 22px 14px; background: var(--c-surface); border: 1px solid var(--c-line);
  border-radius: var(--radius); cursor: pointer; transition: transform .12s, box-shadow .2s;
}
.mod-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-primary); }
.mod-ico { font-size: 30px; }
.mod-name { font-weight: 700; font-size: 15px; }
.mod-badge {
  position: absolute; top: 10px; right: 10px; min-width: 22px; height: 22px; padding: 0 6px;
  border-radius: 11px; background: var(--c-danger); color: #fff; font-size: 12px;
  display: grid; place-items: center; font-weight: 700;
}

/* ===== 章节列表 / 试卷列表 ===== */
.rail-wide { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.rail-ch.chapter-card {
  display: flex; flex-direction: column; gap: 8px; text-align: left;
  padding: 18px; background: var(--c-surface); border: 1px solid var(--c-line);
  border-radius: var(--radius); cursor: pointer; transition: transform .12s, box-shadow .2s;
}
.rail-ch.chapter-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-primary); }
.cc-name { font-weight: 800; font-size: 16px; }
.cc-meta { font-size: 13px; color: var(--c-text-2); }
.cc-progress { height: 8px; background: var(--c-surface-2); border-radius: 4px; overflow: hidden; }
.cc-progress > i { display: block; height: 100%; background: var(--c-primary-grad); }
.cc-cta { margin-top: 4px; font-size: 13px; font-weight: 700; color: var(--c-primary); }

.paper-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.paper-card {
  display: flex; flex-direction: column; gap: 8px; text-align: left;
  padding: 18px; background: var(--c-surface); border: 1px solid var(--c-line);
  border-radius: var(--radius); cursor: pointer; transition: transform .12s, box-shadow .2s;
}
.paper-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-primary); }
.pc-name { font-weight: 800; font-size: 16px; }
.pc-meta { font-size: 13px; color: var(--c-text-2); }
.pc-cta { margin-top: 4px; font-size: 13px; font-weight: 700; color: var(--c-primary); }

/* ===== 错题/收藏头 ===== */
.mb-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.mb-title { font-size: 18px; font-weight: 800; }
.mb-meta { font-size: 13px; color: var(--c-text-2); margin-bottom: 8px; }

/* ===== 题目卡 ===== */
.q-card { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.q-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.q-type { background: var(--c-surface-2); color: var(--c-primary); font-weight: 700; font-size: 12px; padding: 3px 10px; border-radius: 8px; }
.q-idx { font-size: 12px; color: var(--c-text-2); margin-left: auto; }
.q-tag { font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 8px; }
.q-tag.pending { background: #fee2e2; color: var(--c-danger); }
.q-tag.done { background: #dcfce7; color: var(--c-success); }
.fav-btn { background: var(--c-surface-2); border: none; border-radius: 8px; padding: 4px 10px; cursor: pointer; font-size: 13px; font-weight: 700; color: var(--c-text-2); }
.fav-btn.on { background: #fff7e0; color: #d97706; }
.q-text { font-size: 16px; font-weight: 600; margin-bottom: 14px; }
.q-subjective-tip { background: #fff7e0; color: #92400e; font-size: 13px; padding: 8px 12px; border-radius: 10px; margin-bottom: 12px; }
.q-input { width: 100%; padding: 10px 12px; font-size: 15px; border: 1px solid var(--c-line); border-radius: 10px; font-family: inherit; }
textarea.q-input { resize: vertical; }

.q-opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; align-items: flex-start; gap: 12px; text-align: left;
  padding: 12px 14px; border: 1.5px solid var(--c-line); border-radius: 12px;
  background: var(--c-surface); cursor: pointer; font-size: 15px; transition: border-color .12s, background .12s;
}
.opt:hover { border-color: var(--c-primary); }
.opt.sel { border-color: var(--c-primary); background: #eef4ff; }
.opt.right { border-color: var(--c-success); background: #ecfdf3; }
.opt.wrong { border-color: var(--c-danger); background: #fef2f3; }
.opt.disabled { cursor: default; opacity: .95; }
.opt-l { flex: 0 0 26px; width: 26px; height: 26px; border-radius: 50%; background: var(--c-surface-2); display: grid; place-items: center; font-weight: 700; color: var(--c-primary); }
.opt-t { flex: 1; }

.q-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.q-done-tip { margin-left: auto; align-self: center; color: var(--c-success); font-weight: 700; font-size: 14px; }

/* 题库图片：保持源文档相对位置，且自适应容器不溢出
   —— 真题/模拟/章节里题干图、选项图（图形推理 2×2）、解析配图均走 markdown <img> */
.q-card img,
.article-body img,
.kb-single img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin: 8px 0;
  display: block;
}
/* markdown 表格（含选项图/解析图示）在窄屏可横向滚动，避免撑破布局 */
.q-card table,
.article-body table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 10px 0;
}
.q-card table td,
.q-card table th,
.article-body table td,
.article-body table th {
  border: 1px solid var(--c-line);
  padding: 6px 10px;
  vertical-align: middle;
  text-align: left;
}
.q-card table img,
.article-body table img { margin: 4px 0; }

/* 解析抽屉 */
.reveal { margin-top: 14px; border-top: 1px dashed var(--c-line); padding-top: 12px; }
.rv-line { font-size: 14px; margin-bottom: 8px; }
.rv-line.ok { color: var(--c-success); }
.rv-line.no { color: var(--c-danger); }
.rv-block { margin-top: 10px; }
.rv-h { font-size: 13px; font-weight: 800; color: var(--c-primary); margin-bottom: 4px; }
.rv-b { font-size: 14px; }
/* 中文正文首行缩进 2 字符（markdown 渲染段落保留源文档版式） */
.q-text p,
.rv-b p,
.article-body p,
.kb-single .fc-front p,
.kb-single .fc-back p { text-indent: 2em; margin: 0 0 8px; line-height: 1.85; }
.q-text p:first-child,
.rv-b p:first-child { text-indent: 2em; }
.sp-list { margin: 0; padding-left: 18px; }
.sp-list li { margin-bottom: 4px; font-size: 14px; }
.sp-score { display: inline-block; margin-right: 6px; font-weight: 700; color: var(--c-warn); }

/* ===== 练习头部 / 考试 ===== */
.practice-head { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: 12px; padding: 12px 14px; margin-bottom: 14px; }
.ph-title { font-weight: 800; }
.ph-meta { font-size: 13px; color: var(--c-text-2); margin: 4px 0; }
.ph-bar { height: 8px; background: var(--c-surface-2); border-radius: 4px; overflow: hidden; }
.ph-bar > i { display: block; height: 100%; background: var(--c-primary-grad); }

.exambar { display: flex; align-items: center; gap: 12px; background: #0f172a; color: #fff; border-radius: 12px; padding: 10px 14px; margin-bottom: 14px; }
.exam-timer-wrap { display: flex; flex-direction: column; }
.exam-tip { font-size: 11px; opacity: .7; }
.exam-timer { font-size: 22px; font-weight: 800; font-variant-numeric: tabular-nums; }
.exam-timer.warn { color: #fbbf24; }
.exam-title { flex: 1; font-weight: 700; font-size: 15px; text-align: center; }
.exambar .btn.danger { background: var(--c-danger); }

.quiz-layout { display: flex; gap: 16px; align-items: flex-start; }
.quiz-main { flex: 1; min-width: 0; }

.exam-palette { flex: 0 0 180px; background: var(--c-surface); border: 1px solid var(--c-line); border-radius: 12px; padding: 12px; position: sticky; top: 72px; }
.ep-title { font-weight: 800; margin-bottom: 8px; font-size: 14px; }
.ep-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.ep-btn { height: 34px; border: 1px solid var(--c-line); border-radius: 8px; background: var(--c-surface); cursor: pointer; font-size: 13px; font-weight: 700; color: var(--c-text-2); }
.ep-btn.answered { background: #dbeafe; color: var(--c-primary); border-color: var(--c-primary); }
.ep-btn.current { background: var(--c-primary-grad); color: #fff; border-color: transparent; }
.ep-legend { display: flex; gap: 8px; margin-top: 10px; font-size: 11px; color: var(--c-text-2); flex-wrap: wrap; }
.ep-legend .lg { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -2px; margin-right: 3px; }
.ep-legend .lg.current { background: var(--c-primary); }
.ep-legend .lg.answered { background: #dbeafe; border: 1px solid var(--c-primary); }

/* ===== 成绩报告 ===== */
.result-page { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.rs-title { font-size: 18px; font-weight: 800; margin-bottom: 16px; }
.rs-top { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.rs-ring { position: relative; width: 140px; height: 140px; flex: 0 0 140px; }
.rs-ring svg { transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--c-surface-2); stroke-width: 12; }
.ring-fg { fill: none; stroke: url(#grad); stroke: var(--c-primary); stroke-width: 12; stroke-linecap: round; transition: stroke-dashoffset .6s; }
.rs-ring .ring-num { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.ring-num b { font-size: 30px; }
.ring-num span { display: block; font-size: 12px; color: var(--c-text-2); }
.rs-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; flex: 1; min-width: 200px; }
.rs-cell { background: var(--c-surface-2); border-radius: 12px; padding: 12px 14px; }
.rs-cell b { font-size: 20px; display: block; }
.rs-cell span { font-size: 12px; color: var(--c-text-2); }
.rs-weak { margin-top: 16px; }
.rs-h { font-weight: 800; margin-bottom: 8px; }
.rs-weak ul { list-style: none; margin: 0; padding: 0; }
.rs-weak li { display: flex; justify-content: space-between; padding: 8px 12px; background: var(--c-surface-2); border-radius: 8px; margin-bottom: 6px; font-size: 14px; }
.rs-weak.ok { color: var(--c-success); font-weight: 700; }
.rs-note { margin-top: 14px; font-size: 13px; color: var(--c-text-2); background: var(--c-surface-2); padding: 10px 12px; border-radius: 10px; }
.action-group, .complete-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 18px; }

/* ===== 知识卡（3D 翻转） ===== */
.kb-single { max-width: 880px; margin: 0 auto; }
.kb-index { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; justify-content: center; }
.kb-idx-i { padding: 4px 10px; border-radius: 10px; background: var(--c-surface-2); font-size: 12px; cursor: pointer; color: var(--c-text-2); }
.kb-idx-i.active { background: var(--c-primary-grad); color: #fff; }

/* 按章配色（kicker 色 + 卡片左边框 + 章节按钮同步） */
.kb-ch-1  { --ch-color: #3b5bdb; }
.kb-ch-2  { --ch-color: #0ea5e9; }
.kb-ch-3  { --ch-color: #16a34a; }
.kb-ch-4  { --ch-color: #f59e0b; }
.kb-ch-5  { --ch-color: #8b5cf6; }
.kb-ch-6  { --ch-color: #e11d48; }
.kb-ch-7  { --ch-color: #b45309; }
.kb-ch-8  { --ch-color: #0891b2; }

/* 正文关键词高亮（背诵重点）— 多色循环，便于扫读 */
.kb-single .kw {
  display: inline-block;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  color: #fff;
  background: #3b82f6;
}
.kb-single .kw:nth-of-type(2) { background: #ef4444; }
.kb-single .kw:nth-of-type(3) { background: #16a34a; }
.kb-single .kw:nth-of-type(4) { background: #f59e0b; color: #422006; }
.kb-single .kw:nth-of-type(5) { background: #8b5cf6; }
.kb-single .kw:nth-of-type(6) { background: #0891b2; }
.kb-single .kw:nth-of-type(7) { background: #ec4899; }
.kb-single .kw:nth-of-type(8) { background: #64748b; }
.kb-single .kw:nth-of-type(9) { background: #ea580c; }
.kb-single .kw:nth-of-type(10) { background: #10b981; }

.kb-single .fc-kicker { color: var(--ch-color); }
.kb-single .fc-front { border-left: 5px solid var(--ch-color); }
.kb-idx-i[data-ch="1"] { --ch-pill: #3b5bdb; }
.kb-idx-i[data-ch="2"] { --ch-pill: #0ea5e9; }
.kb-idx-i[data-ch="3"] { --ch-pill: #16a34a; }
.kb-idx-i[data-ch="4"] { --ch-pill: #f59e0b; }
.kb-idx-i[data-ch="5"] { --ch-pill: #8b5cf6; }
.kb-idx-i[data-ch="6"] { --ch-pill: #e11d48; }
.kb-idx-i[data-ch="7"] { --ch-pill: #b45309; }
.kb-idx-i[data-ch="8"] { --ch-pill: #0891b2; }
.kb-idx-i.active { background: var(--ch-pill, var(--c-primary-grad)); }
.flashcard-page { display: flex; flex-direction: column; }
.flashcard { perspective: 1200px; margin-bottom: 6px; }
/* 知识卡区域放大，并用 max-height 限制视口内高度，避免长内容溢出屏幕 */
.flashcard-inner { position: relative; width: 100%; min-height: 460px; max-height: 76vh; transform-style: preserve-3d; transition: transform .5s; }
.flashcard-inner.flipped { transform: rotateY(180deg); }
.flashcard-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 16px; padding: 26px 28px; background: var(--c-surface); border: 1px solid var(--c-line); box-shadow: var(--shadow); }
.fc-front { display: flex; flex-direction: column; cursor: pointer; }
.fc-kicker { font-size: 13px; font-weight: 700; color: var(--c-primary); margin-bottom: 12px; }
.fc-title { font-size: 22px; font-weight: 800; flex: 1; display: flex; align-items: center; line-height: 1.5; }
.fc-hint { text-align: center; font-size: 13px; color: var(--c-text-2); }
/* 背面长文：内部滚动 + 词内换行，杜绝横向/纵向溢出 */
.fc-back { transform: rotateY(180deg); overflow: auto; line-height: 1.9; font-size: 15px; overflow-wrap: anywhere; word-break: break-word; }
.fc-back mark { background: #fff3bf; color: inherit; padding: 0 2px; border-radius: 3px; }
.stage-nav { display: flex; gap: 12px; align-items: center; justify-content: center; margin-top: 12px; }
.stage-nav .mb-page { font-size: 13px; color: var(--c-text-2); }

/* ===== 加载 / 错误 / 空态 ===== */
.loading-box { text-align: center; padding: 60px 20px; }
#loading { position: fixed; inset: 0; background: rgba(245,247,251,.85); display: grid; place-content: center; text-align: center; z-index: 60; }
.spinner { width: 38px; height: 38px; margin: 0 auto 10px; border: 4px solid var(--c-surface-2); border-top-color: var(--c-primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--c-text-2); font-size: 14px; }

.state-box { text-align: center; padding: 56px 20px; color: var(--c-text-2); }
.state-box .ico { font-size: 40px; display: block; margin-bottom: 12px; }
.state-box .msg { font-size: 15px; margin-bottom: 6px; color: var(--c-text); }
.state-box .sub { font-size: 13px; margin-bottom: 18px; max-width: 420px; margin-left: auto; margin-right: auto; word-break: break-all; }
.state-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ===== toast ===== */
#toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px); background: #0f172a; color: #fff; padding: 10px 18px; border-radius: 12px; font-size: 14px; z-index: 70; opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none; }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== 弹窗 ===== */
.modal-mask { position: fixed; inset: 0; background: rgba(0,0,0,.4); display: grid; place-items: center; z-index: 80; padding: 20px; }
.modal { background: var(--c-surface); border-radius: 16px; padding: 22px; width: min(420px, 92vw); box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.modal-title { margin: 0 0 6px; font-size: 18px; font-weight: 800; }
.modal-sub { margin: 0 0 14px; color: var(--c-text-2); font-size: 13px; }
.modal-input { width: 100%; min-height: 44px; padding: 0 12px; font-size: 16px; border: 1px solid var(--c-line); border-radius: 10px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 14px; }
.modal-err { color: var(--c-danger); font-size: 13px; min-height: 18px; margin: 8px 0 0; }

/* ===== 响应式：平板（侧栏抽屉） ===== */
@media (max-width: 1024px) {
  #railToggle { display: block; }
  #sidebar {
    position: fixed; top: 56px; left: 0; z-index: 50; height: calc(100vh - 56px);
    transform: translateX(-100%); transition: transform .25s; box-shadow: var(--shadow);
  }
  #sidebar.open { transform: translateX(0); }
  #railOverlay { display: block; position: fixed; inset: 56px 0 0 0; background: rgba(0,0,0,.35); z-index: 45; opacity: 0; pointer-events: none; transition: opacity .25s; }
  #railOverlay.show { opacity: 1; pointer-events: auto; }
  #view { padding: 16px 12px 40px; }
}
/* ===== 响应式：手机（全宽紧凑） ===== */
@media (max-width: 640px) {
  .btn { width: 100%; }
  .app-name { font-size: 14px; }
  #view { padding: 12px 10px 40px; }
  .mod-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .rail-wide, .paper-list { grid-template-columns: 1fr; }
  .quiz-layout { flex-direction: column; }
  .exam-palette { width: 100%; flex: none; position: static; }
  .ep-grid { grid-template-columns: repeat(8, 1fr); }
  .rs-stats { grid-template-columns: 1fr 1fr; }
  .hero { padding: 18px; }
}