/* ==========================================================================
   浙大设计考研 · 人工智能刷题平台（学员端）
   配色体系：品牌蓝（浙大蓝的现代版，更通透）＋ 语义色（绿/琥珀/珊瑚红）
             ＋ 中性灰阶（ink / muted / line），全部走 CSS 变量，禁止再写死色值
   ========================================================================== */
:root {
  /* 品牌蓝 */
  --primary: #2563eb;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;

  /* 语义色 */
  --success: #059669;
  --success-50: #ecfdf5;
  --success-100: #d1fae5;
  --success-200: #a7f3d0;
  --warning: #d97706;
  --warning-50: #fffbeb;
  --warning-100: #fef3c7;
  --warning-200: #fde68a;
  --danger: #e11d48;
  --danger-50: #fff1f2;
  --danger-100: #ffe4e6;

  /* 中性 */
  --ink: #101828;
  --ink-2: #344054;
  --muted: #667085;
  --muted-2: #98a2b3;
  --line: #eaecf0;
  --line-2: #d0d5dd;
  --bg: #f5f7fb;
  --card: #ffffff;

  /* 旧别名（历史代码仍在用，值已对齐新色板） */
  --accent: #e11d48;
  --good: #059669;
  --bad: #e11d48;
  --primary-dark: #1e40af;
  --primary-soft: #eff6ff;

  --radius-lg: 20px;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-xs: 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-sm: 0 1px 3px rgba(16, 24, 40, .05), 0 4px 12px -2px rgba(16, 24, 40, .05);
  --shadow-md: 0 2px 6px -1px rgba(16, 24, 40, .06), 0 12px 28px -6px rgba(16, 24, 40, .10);
  --shadow-lg: 0 8px 12px -4px rgba(16, 24, 40, .06), 0 24px 48px -12px rgba(16, 24, 40, .18);
  --ring: 0 0 0 4px rgba(37, 99, 235, .13);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  /* 顶部一层极淡的蓝色光晕，比纯灰底更有质感，且不干扰内容 */
  background-image: radial-gradient(1100px 560px at 50% -280px, #dfeaff 0%, rgba(223, 234, 255, 0) 72%);
  background-repeat: no-repeat;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 14px; }

/* ================= 顶栏 ================= */
.topbar {
  background: linear-gradient(115deg, #0b214f 0%, #16337f 46%, #2563eb 100%);
  color: #fff;
  padding: 15px 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .10), 0 8px 28px -12px rgba(11, 33, 79, .55);
}
.topbar-inner { max-width: 880px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.brand-mark {
  flex: 0 0 auto; width: 34px; height: 34px; border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(140deg, rgba(255, 255, 255, .26), rgba(255, 255, 255, .06));
  border: 1px solid rgba(255, 255, 255, .30);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .28);
}
.brand-mark svg { width: 19px; height: 19px; }
.brand h1 { font-size: 17.5px; font-weight: 600; letter-spacing: -.01em; white-space: nowrap; }
.brand-badge {
  background: rgba(255, 255, 255, .14); border: 1px solid rgba(255, 255, 255, .26);
  padding: 4px 11px; border-radius: 999px; font-size: 12.5px; letter-spacing: .02em;
}
.user-area { display: flex; align-items: center; gap: 10px; font-size: 14px; flex-shrink: 0; }
.user-area .btn.ghost { color: rgba(255, 255, 255, .82); border-color: rgba(255, 255, 255, .32); background: rgba(255, 255, 255, .08); }
.user-area .btn.ghost:hover { color: #fff; border-color: rgba(255, 255, 255, .6); background: rgba(255, 255, 255, .16); }

.container { max-width: 880px; margin: 26px auto 60px; padding: 0 20px; }
.view { animation: fadeIn .28s cubic-bezier(.22, .61, .36, 1); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ================= 卡片 / 通用 ================= */
.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px;
  margin-bottom: 20px;
  border: 1px solid var(--line);
}
.card h2 { font-size: 19px; font-weight: 650; letter-spacing: -.01em; margin-bottom: 6px; }

.login-card { max-width: 420px; margin: 46px auto 0; }

/* 登录方式 Tab */
.login-tabs { display: flex; gap: 6px; margin: 14px 0 4px; background: var(--bg); padding: 4px; border-radius: 10px; }
.login-tab { flex: 1; padding: 9px 0; border: none; background: transparent; border-radius: 8px; cursor: pointer; font-size: 14px; color: var(--ink-2); font-family: inherit; transition: all .15s; }
.login-tab.active { background: #fff; color: var(--primary); font-weight: 600; box-shadow: 0 1px 3px rgba(16, 24, 40, .12); }

/* 微信扫码/数字码登录 */
.scan-row { display: flex; gap: 20px; align-items: center; margin-top: 16px; }
.scan-qr-wrap { flex: 0 0 148px; height: 148px; border: 1.5px dashed var(--line-2); border-radius: 12px; display: flex; align-items: center; justify-content: center; overflow: hidden; background: #fff; }
.scan-qr { width: 144px; height: 144px; display: none; }
.scan-qr.loaded { display: block; }
.scan-num-wrap { flex: 1; min-width: 0; }
.scan-hint { font-size: 13px; line-height: 1.55; }
.scan-code { font-size: 34px; font-weight: 700; letter-spacing: 6px; color: var(--primary); font-variant-numeric: tabular-nums; margin-top: 8px; }
.scan-status { margin-top: 14px; font-size: 13.5px; }

@media (max-width: 520px) {
  .scan-row { flex-direction: column; }
  .scan-qr-wrap { flex-basis: auto; }
}
.field { margin-top: 16px; }
.field label { display: block; font-size: 13px; font-weight: 500; color: var(--ink-2); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 14px; font-size: 15px; font-family: inherit;
  border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  outline: none; background: #fff; color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
.field input::placeholder { color: var(--muted-2); }
.field input:focus { border-color: var(--primary); box-shadow: var(--ring); }

.btn {
  padding: 10px 22px; font-size: 15px; font-weight: 500; border-radius: var(--radius-sm);
  border: 1px solid transparent; cursor: pointer; transition: all .15s; font-family: inherit;
  letter-spacing: .01em;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--primary); color: #fff; box-shadow: 0 1px 2px rgba(16, 24, 40, .06); }
/* 按钮内的线性图标：跟着文字基线排，别让 svg 撑高行 */
.btn svg { width: 15px; height: 15px; vertical-align: -2.5px; margin-right: 6px; }
.btn.primary:hover:not(:disabled) { background: var(--primary-700); box-shadow: 0 6px 18px -6px rgba(37, 99, 235, .55); }
.btn.primary:active:not(:disabled) { background: var(--primary-800); }
.btn.ghost { background: #fff; color: var(--ink-2); border: 1.5px solid var(--line-2); }
.btn.ghost:hover { color: var(--primary); border-color: var(--primary-200); background: var(--primary-50); }
.btn.sm { padding: 6px 14px; font-size: 13px; border-radius: 9px; }
.btn.block { width: 100%; margin-top: 22px; padding: 12px; font-size: 15.5px; }
.btn.warn { background: var(--warning-50); border: 1.5px solid var(--warning-200); color: #b45309; }
.btn.warn:hover { background: var(--warning-100); border-color: var(--warning); }
.row-end { display: flex; justify-content: flex-end; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 10px; }

.error {
  margin-top: 14px; padding: 10px 14px; border-radius: var(--radius-sm);
  background: var(--danger-50); border: 1px solid var(--danger-100);
  color: var(--danger); font-size: 14px;
}

/* ================= 主页入口 ================= */
.home-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.entry-card {
  text-align: center; padding: 34px 24px 30px; cursor: pointer; position: relative;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff 0%, #fbfcff 100%);
  box-shadow: var(--shadow-sm);
  transition: transform .2s cubic-bezier(.22, .61, .36, 1), box-shadow .2s, border-color .2s;
}
.entry-card:hover {
  transform: translateY(-4px); border-color: var(--primary-200);
  box-shadow: 0 14px 34px -12px rgba(37, 99, 235, .35), var(--shadow-sm);
}
.entry-icon {
  width: 74px; height: 74px; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 22px; color: var(--primary);
  background: linear-gradient(140deg, var(--primary-50), var(--primary-100));
  border: 1px solid var(--primary-100);
  transition: transform .2s, background .2s;
}
.entry-icon svg { width: 34px; height: 34px; }
.entry-card:hover .entry-icon { transform: scale(1.05); background: linear-gradient(140deg, var(--primary-100), var(--primary-200)); }
/* 错题本入口：珊瑚色，和「去刷题」区分开 */
.entry-card.alt .entry-icon {
  color: var(--danger);
  background: linear-gradient(140deg, var(--danger-50), var(--danger-100));
  border-color: var(--danger-100);
}
.entry-card.alt:hover { border-color: var(--danger-100); box-shadow: 0 14px 34px -12px rgba(225, 29, 72, .32), var(--shadow-sm); }
.entry-card.alt:hover .entry-icon { background: linear-gradient(140deg, var(--danger-100), #ffc9d2); }
.entry-card h2 { margin-bottom: 8px; }
.entry-card .muted { line-height: 1.75; font-size: 13.5px; }
.wrong-badge {
  position: absolute; top: 16px; right: 16px;
  background: var(--danger); color: #fff; font-size: 12.5px; font-weight: 600;
  padding: 4px 11px; border-radius: 999px; box-shadow: 0 2px 8px -2px rgba(225, 29, 72, .6);
}
.source-note { text-align: center; margin-top: 2px; font-size: 13px; }

/* ================= 章节 / 参考书选择 ================= */
.chapter-list { display: grid; gap: 12px; margin-top: 16px; }
.chapter-item {
  padding: 16px 18px; border: 1.5px solid var(--line); border-radius: var(--radius);
  cursor: pointer; position: relative; background: #fff;
  transition: border-color .15s, box-shadow .15s, transform .15s, background .15s;
}
.chapter-item:hover { border-color: var(--primary-200); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.chapter-item.active {
  border-color: var(--primary); background: var(--primary-50); box-shadow: var(--ring);
}
.chapter-item.active .ch-name { color: var(--primary-800); }
.ch-name { font-size: 15.5px; font-weight: 600; letter-spacing: -.01em; margin-bottom: 6px; }
.ch-meta { font-size: 13px; color: var(--muted); line-height: 1.65; }
.wrong-tip {
  position: absolute; top: 14px; right: 14px; font-size: 12px; font-weight: 500;
  color: var(--danger); background: var(--danger-50); border: 1px solid var(--danger-100);
  padding: 2px 10px; border-radius: 999px;
}
.book-exam-tag {
  display: inline-block; margin-left: 8px; font-size: 11.5px; font-weight: 500;
  color: #047857; background: var(--success-50); border: 1px solid var(--success-100);
  padding: 2px 8px; border-radius: 999px; vertical-align: 2px;
}

/* ================= 做题 ================= */
.quiz-progress { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.progress-track { flex: 1; height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; }
.progress-fill {
  height: 100%; width: 0; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary-600), #60a5fa);
  transition: width .35s cubic-bezier(.22, .61, .36, 1);
}
.tag {
  display: inline-block; padding: 4px 11px; border-radius: 999px; font-size: 12.5px; font-weight: 500;
  background: var(--primary-50); color: var(--primary-800); border: 1px solid var(--primary-100);
}
/* 章节名/考试代码这类「上下文标签」用品牌蓝；红色只留给错题计数 */
.tag.accent { background: var(--primary-50); color: var(--primary-800); border-color: var(--primary-100); }
.tag.real { background: var(--danger-50); color: #be123c; border-color: var(--danger-100); }
.tag.mock { background: var(--primary-50); color: var(--primary-700); border-color: var(--primary-100); }
.q-title { font-size: 17.5px; font-weight: 600; line-height: 1.75; margin: 16px 0 22px; letter-spacing: -.01em; }
.options { display: grid; gap: 11px; }
.option {
  display: flex; align-items: flex-start; gap: 13px; text-align: left; width: 100%;
  padding: 14px 17px; font-size: 15px; line-height: 1.65;
  border: 1.5px solid var(--line); border-radius: var(--radius); background: #fff;
  cursor: pointer; transition: all .15s; font-family: inherit; color: var(--ink);
}
.option:hover:not(.locked):not(:disabled) { border-color: var(--primary-200); background: var(--primary-50); }
.option.locked, .option:disabled { cursor: default; }
/* 禁用态不能把「正确/错误」配色洗掉，也不能变透明 */
.option:disabled { opacity: 1; color: var(--ink); }
.opt-label {
  flex-shrink: 0; width: 27px; height: 27px; border-radius: 9px;
  background: #f2f4f7; color: var(--ink-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 13.5px; font-weight: 600; transition: all .15s;
}
.option:hover:not(.locked):not(:disabled) .opt-label { background: var(--primary-100); color: var(--primary-800); }
.option.right { border-color: var(--success); background: var(--success-50); }
.option.right .opt-label { background: var(--success); color: #fff; }
.option.wrong { border-color: var(--danger); background: var(--danger-50); }
.option.wrong .opt-label { background: var(--danger); color: #fff; }
/* 多选：选中态（提交前） */
.option.picked { border-color: var(--primary); background: var(--primary-50); box-shadow: var(--ring); }
.option.picked .opt-label { background: var(--primary); color: #fff; }
.blank-input.locked-field, .essay-input.locked-field { background: #f2f4f7; color: var(--ink-2); cursor: default; }

.feedback {
  margin-top: 20px; padding: 15px 17px; border-radius: var(--radius);
  font-size: 14.5px; line-height: 1.85; border: 1px solid transparent;
}
.feedback.ok { background: var(--success-50); border-color: var(--success-100); border-left: 4px solid var(--success); color: #047857; }
.feedback.bad { background: var(--danger-50); border-color: var(--danger-100); border-left: 4px solid var(--danger); color: #be123c; }
.feedback.neu { background: #f8fafc; border-color: var(--line); border-left: 4px solid var(--muted-2); color: var(--ink); }
.fb-head { font-weight: 650; margin-bottom: 6px; font-size: 15px; }
/* 反馈标题里的小图标：对勾/叉/自评，跟文字同色 */
.fb-head svg { width: 16px; height: 16px; vertical-align: -3px; margin-right: 7px; }
.fb-analysis { color: var(--ink); }
.fb-ref { background: var(--primary-50); border: 1px solid var(--primary-100); border-radius: var(--radius-sm); padding: 9px 13px; margin: 8px 0; line-height: 1.85; }
.fb-blank { font-size: 13.5px; }

/* ================= 成绩单 ================= */
.score-wrap { text-align: center; margin: 8px 0 16px; }
.score-num {
  font-size: 60px; font-weight: 700; line-height: 1.05; letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(140deg, var(--primary-600), #7c3aed 90%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.score-num.high { background: linear-gradient(140deg, #059669, #10b981); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.score-num.mid { background: linear-gradient(140deg, #d97706, #f59e0b); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.score-num.low { background: linear-gradient(140deg, #e11d48, #fb7185); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.score-label { font-size: 13px; color: var(--muted); margin-top: 6px; letter-spacing: .04em; }
.result-detail { margin-top: 20px; }
.rd-item { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-top: 10px; background: #fff; }
.rd-item.ok { border-left: 3px solid var(--success); }
.rd-item.bad { border-left: 3px solid var(--danger); }
.rd-item.neutral { border-left: 3px solid var(--muted-2); }
.rd-q { font-size: 14.5px; line-height: 1.7; }
/* 成绩单每题的对/错标记 */
.rd-mark {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 20px; height: 20px; padding: 0 7px; border-radius: 6px;
  font-size: 12px; font-weight: 600; vertical-align: -4px; margin-left: 4px;
}
.rd-mark svg { width: 13px; height: 13px; margin: 0; }
.rd-mark.ok { background: var(--success-50); color: var(--success); border: 1px solid var(--success-100); }
.rd-mark.bad { background: var(--danger-50); color: var(--danger); border: 1px solid var(--danger-100); }
.rd-mark.neu { background: var(--line); color: var(--muted); border: 1px solid var(--line-2); }
.rd-a { margin-top: 8px; font-size: 13.5px; color: var(--muted); line-height: 1.8; }

/* ================= 错题本 · 收藏 ================= */
.wb-tabs { display: flex; gap: 8px; margin: 4px 0 14px; }
.wb-tab {
  padding: 7px 16px; border-radius: 999px; border: 1.5px solid var(--line); background: #fff;
  font-family: inherit; font-size: 14px; color: var(--muted); cursor: pointer; transition: all .15s;
}
.wb-tab:hover { border-color: var(--primary-200); color: var(--primary); background: var(--primary-50); }
.wb-tab.active { border-color: var(--primary); background: var(--primary); color: #fff; font-weight: 600; box-shadow: 0 4px 12px -4px rgba(37, 99, 235, .5); }
.wb-tab b { margin-left: 5px; font-weight: 600; }
.wb-toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.wb-books { display: flex; gap: 6px; flex-wrap: wrap; }
.wb-chip {
  padding: 5px 12px; border-radius: 999px; border: 1.5px solid var(--line); background: #fff;
  font-family: inherit; font-size: 13px; color: var(--muted); cursor: pointer; transition: all .15s;
}
.wb-chip:hover { border-color: var(--primary-200); color: var(--primary); background: var(--primary-50); }
.wb-chip.active { border-color: var(--primary); background: var(--primary-50); color: var(--primary-800); font-weight: 600; }
.wb-search {
  flex: 1; min-width: 190px; padding: 8px 13px; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  font-size: 14px; font-family: inherit; background: #fff; color: var(--ink); outline: none; transition: border-color .15s, box-shadow .15s;
}
.wb-search:focus { border-color: var(--primary); box-shadow: var(--ring); }
.wb-hint { font-size: 13px; margin-bottom: 10px; line-height: 1.7; }
.wb-actions { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.wb-ch { margin-top: 14px; }
.wb-ch-head { display: flex; align-items: center; gap: 10px; }
.wb-ch-toggle {
  flex: 1; min-width: 0; display: flex; align-items: center; gap: 9px;
  padding: 11px 14px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, #ffffff, #fbfcfe);
  font-family: inherit; font-size: 14.5px; font-weight: 600; color: var(--ink);
  cursor: pointer; text-align: left; transition: all .15s;
}
.wb-ch-toggle:hover { border-color: var(--primary-200); background: var(--primary-50); }
.wb-caret { flex: 0 0 auto; display: inline-block; color: var(--muted); font-size: 12px; transition: transform .15s; }
.wb-ch.open .wb-caret { transform: rotate(90deg); }
.wb-ch-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.wb-ch-cnt {
  flex: 0 0 auto; font-size: 12px; font-weight: 500;
  color: var(--danger); background: var(--danger-50); border: 1px solid var(--danger-100);
  padding: 2px 10px; border-radius: 999px;
}
.wb-ch-body { margin-top: 8px; display: grid; gap: 8px; }
.wb-q { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow: hidden; transition: border-color .15s; }
.wb-q:hover { border-color: var(--primary-200); }
.wb-q > summary { display: flex; align-items: center; gap: 9px; padding: 12px 14px; cursor: pointer; list-style: none; }
.wb-q > summary::-webkit-details-marker { display: none; }
.wb-q > summary:hover { background: var(--primary-50); }
.wb-q-type {
  flex: 0 0 auto; font-size: 12px; font-weight: 500;
  color: var(--primary-800); background: var(--primary-50); border: 1px solid var(--primary-100);
  border-radius: 7px; padding: 2px 8px;
}
.wb-q-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.wb-arch {
  flex: 0 0 auto; color: #b45309; border: 1px solid var(--warning-200);
  border-radius: 5px; padding: 0 6px; font-size: 12px; margin-left: 4px; background: var(--warning-50);
}
.wb-q-meta { flex: 0 0 auto; font-size: 12px; color: var(--muted-2); }
.wb-q[open] > summary { border-bottom: 1px dashed var(--line); }
.wb-q .rd-a { padding: 0 14px 13px; }
.empty { text-align: center; padding: 50px 0; font-size: 15px; color: var(--muted-2); }

/* ================= 加载 ================= */
.loading {
  position: fixed; inset: 0; background: rgba(247, 249, 252, .82);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  backdrop-filter: blur(3px); z-index: 100; font-size: 15px; color: var(--primary-800);
}
.spinner { width: 38px; height: 38px; border: 3px solid var(--primary-100); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ================= 考试代码选择 ================= */
.exam-switch { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.exam-chip {
  padding: 8px 18px; border-radius: 999px; border: 1.5px solid var(--line); background: #fff;
  font-size: 14px; cursor: pointer; color: var(--ink-2); transition: all .15s; font-family: inherit;
}
.exam-chip:hover { border-color: var(--primary-200); color: var(--primary); background: var(--primary-50); }
.exam-chip.active { border-color: var(--primary); background: var(--primary); color: #fff; font-weight: 600; box-shadow: 0 4px 12px -4px rgba(37, 99, 235, .5); }
.exam-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 14px; }
.exam-grid .entry-card h2 { font-size: 17px; }
@media (max-width: 560px) { .exam-grid { grid-template-columns: 1fr; } }

/* ================= 继续上次卡片 ================= */
.continue-card {
  position: relative; display: flex; justify-content: space-between; align-items: center; gap: 18px;
  margin-bottom: 20px; padding-left: 24px;
  border: 1px solid var(--primary-100);
  background: linear-gradient(120deg, #f8faff 0%, #ffffff 60%);
  box-shadow: var(--shadow-md); overflow: hidden;
}
.continue-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: linear-gradient(180deg, var(--primary-600), #60a5fa); }
.cc-tag {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: .02em;
  color: var(--primary-800); background: var(--primary-100); border-radius: 999px; padding: 2px 10px; margin-bottom: 7px;
}
.cc-left h2 { margin: 2px 0 5px; font-size: 18px; letter-spacing: -.01em; }
.cc-meta { margin: 0 0 11px; font-size: 13px; }
.cc-progress { display: flex; align-items: center; gap: 11px; }
.cc-bar-wrap { flex: 1 1 auto; max-width: 260px; height: 8px; border-radius: 999px; background: var(--primary-100); overflow: hidden; }
.cc-bar { height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, var(--primary-600), #60a5fa); transition: width .35s; }
.cc-prog-text { font-size: 12.5px; color: var(--muted); white-space: nowrap; }
.cc-close {
  position: absolute; top: 8px; right: 10px; width: 26px; height: 26px; border: none; background: none;
  color: var(--muted-2); font-size: 18px; line-height: 1; cursor: pointer; border-radius: 8px; font-family: inherit;
  transition: all .15s;
}
.cc-close:hover { background: var(--line); color: var(--ink-2); }
.wb-scope {
  font-size: 12.5px; font-weight: 500; color: var(--primary-800); background: var(--primary-50);
  border: 1px solid var(--primary-100); border-radius: 999px; padding: 2px 10px; vertical-align: middle; margin-left: 4px;
}
.cc-right { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; flex-shrink: 0; }

/* ================= 题目反馈 ================= */
.qfb { display: flex; align-items: center; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.qfb-label { font-size: 13px; color: var(--muted); }
.qfb-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 13px; font-size: 13px; border-radius: 999px;
  border: 1.5px solid var(--line); background: #fff; cursor: pointer; color: var(--muted);
  transition: all .15s; font-family: inherit;
}
.qfb-btn svg { width: 14px; height: 14px; }
.qfb-btn:hover { border-color: var(--primary-200); color: var(--primary); background: var(--primary-50); }
.qfb-btn.active { border-color: var(--primary); background: var(--primary-50); color: var(--primary-800); font-weight: 600; }
.qfb-btn.fb-star.active { border-color: var(--warning-200); background: var(--warning-50); color: #b45309; }
.qfb-msg { font-size: 12.5px; color: var(--success); }
.qfb-askbox { margin-top: 10px; display: grid; gap: 8px; }
.qfb-askbox textarea {
  width: 100%; padding: 10px 13px; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  font-size: 14px; font-family: inherit; resize: vertical; outline: none; color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
.qfb-askbox textarea:focus { border-color: var(--primary); box-shadow: var(--ring); }
.qfb-askbox .btn { justify-self: end; }
.rd-item .qfb { border-top: 1px dashed var(--line); padding-top: 11px; }

/* ================= 填空题 / 简答题 ================= */
.blank-wrap { display: grid; gap: 10px; }
.blank-input {
  width: 100%; padding: 11px 14px; font-size: 15px; font-family: inherit; color: var(--ink);
  border: 1.5px solid var(--line); border-radius: var(--radius-sm); outline: none;
  transition: border-color .15s, box-shadow .15s; background: #fff;
}
.blank-input:focus { border-color: var(--primary); box-shadow: var(--ring); }
.essay-input {
  width: 100%; padding: 13px 15px; font-size: 15px; line-height: 1.85; font-family: inherit; color: var(--ink);
  border: 1.5px solid var(--line); border-radius: var(--radius-sm); outline: none; resize: vertical; background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
.essay-input:focus { border-color: var(--primary); box-shadow: var(--ring); }
.essay-input::placeholder, .blank-input::placeholder { color: var(--muted-2); }

/* ================= 响应式 ================= */
@media (max-width: 640px) {
  .home-grid { grid-template-columns: 1fr; }
  .card { padding: 20px 18px; border-radius: var(--radius); }
  .container { margin-top: 18px; }
  .brand h1 { font-size: 16px; }
  .brand-badge { display: none; }
  .score-num { font-size: 48px; }
}
@media (max-width: 560px) {
  .continue-card { flex-direction: column; align-items: stretch; }
  .cc-right { align-items: stretch; }
  .cc-right .btn { width: 100%; }
  .cc-bar-wrap { max-width: none; }
  /* 窄屏进度文案允许换行，避免 nowrap 把卡片撑出横向滚动 */
  .cc-prog-text { white-space: normal; }
  /* 底部操作按钮整行铺满，比右下角挤成两行更整齐 */
  .row-end { flex-direction: column; }
  .row-end .btn { width: 100%; }
  .wb-actions { align-items: stretch; }
  .wb-actions .btn { width: 100%; }
}