/* 智能刷题系统 — 深色极简主题 */
:root {
  --bg: #020617;
  --panel: #0f172a;
  --panel-2: #1e293b;
  --border: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #22d3ee;
  --accent-2: #3b82f6;
  --success: #34d399;
  --danger: #fb7185;
  --warn: #fbbf24;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { min-height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
}
.hidden { display: none !important; }
main { max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px; }
h1 { font-size: 17px; }
h3.section-title { font-size: 13px; color: var(--muted); font-weight: 600; margin: 26px 0 12px; letter-spacing: .05em; }
.muted { color: var(--muted); }
.text-center { text-align: center; }

/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 22px;
  background: rgba(15, 23, 42, .82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; cursor: pointer; user-select: none; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 17px; color: #fff;
  box-shadow: 0 4px 18px rgba(34, 211, 238, .25);
}
.brand-logo.lg { width: 52px; height: 52px; font-size: 22px; border-radius: 15px; margin: 0 auto 14px; }
.brand h1 { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand-sub { font-size: 12px; color: var(--muted); }
.top-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.user-chip {
  display: flex; align-items: center; gap: 8px;
  background: var(--panel); border: 1px solid var(--border);
  padding: 5px 12px; border-radius: 999px; font-size: 13px;
}
.role-badge { font-size: 11px; padding: 1px 8px; border-radius: 999px; background: rgba(34,211,238,.12); color: var(--accent); border: 1px solid rgba(34,211,238,.25); }
.role-badge.admin { background: rgba(251,191,36,.12); color: var(--warn); border-color: rgba(251,191,36,.3); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 8px 14px; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all .15s; white-space: nowrap;
}
.btn:hover { border-color: #334155; background: #273449; }
.btn.primary { background: linear-gradient(135deg, #0891b2, #2563eb); border-color: transparent; color: #fff; }
.btn.primary:hover { filter: brightness(1.12); }
.btn.danger { background: rgba(251,113,133,.14); border-color: rgba(251,113,133,.4); color: var(--danger); }
.btn.danger:hover { background: rgba(251,113,133,.25); }
.btn.success { background: rgba(52,211,153,.14); border-color: rgba(52,211,153,.4); color: var(--success); }
.btn.success:hover { background: rgba(52,211,153,.25); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 10px; font-size: 12px; border-radius: 8px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* 登录页 */
#view-login { display: flex; justify-content: center; align-items: center; min-height: calc(100vh - 65px); }
.login-card {
  width: 340px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 18px; padding: 36px 30px; text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.login-card h2 { font-size: 18px; margin-bottom: 24px; }
.login-card input {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  border-radius: 10px; padding: 11px 14px; color: var(--text);
  font-size: 14px; margin-bottom: 12px; outline: none; transition: border-color .15s;
}
.login-card input:focus { border-color: var(--accent); }
.login-error { color: var(--danger); font-size: 12px; min-height: 18px; margin-bottom: 8px; text-align: left; }

/* 工具栏 */
.toolbar { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.toolbar-left { display: flex; gap: 8px; flex-wrap: wrap; }

/* 题库卡片 */
.bank-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.bank-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; transition: border-color .15s, transform .15s;
  display: flex; flex-direction: column; gap: 10px;
}
.bank-card:hover { border-color: rgba(34,211,238,.4); transform: translateY(-2px); }
.bank-card .bank-name { font-size: 15px; font-weight: 600; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.bank-meta { font-size: 12px; color: var(--muted); }
.bank-types { font-size: 12px; color: var(--muted); }
.bank-actions { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; }
.badge {
  font-size: 11px; padding: 1px 8px; border-radius: 999px; font-weight: 500;
  background: rgba(34,211,238,.1); color: var(--accent); border: 1px solid rgba(34,211,238,.25);
}
.badge.public { background: rgba(52,211,153,.1); color: var(--success); border-color: rgba(52,211,153,.25); }
.badge.mistake { background: rgba(251,113,133,.1); color: var(--danger); border-color: rgba(251,113,133,.25); }
.mini-badge { font-size: 10px; background: rgba(34,211,238,.15); color: var(--accent); border-radius: 999px; padding: 0 6px; margin-left: 4px; }
.empty-tip { color: var(--muted); font-size: 13px; padding: 18px; text-align: center; border: 1px dashed var(--border); border-radius: var(--radius); }

/* 恢复提示条 */
.resume-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: rgba(34,211,238,.07); border: 1px solid rgba(34,211,238,.3);
  border-radius: var(--radius); padding: 12px 16px; margin: 14px 0 4px; font-size: 13px;
}

/* 刷题页 */
.practice-head {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 16px; padding-bottom 14px;
}
.practice-head .practice-meta { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.practice-head .spacer { flex: 1; }
.practice-progress { font-size: 13px; color: var(--muted); }
.practice-progress b { color: var(--accent); }
.practice-body { display: grid; grid-template-columns: 1fr 300px; gap: 16px; align-items: start; }
@media (max-width: 900px) { .practice-body { grid-template-columns: 1fr; } }
.quiz-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.quiz-tags { display: flex; gap: 8px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.tag { font-size: 12px; padding: 2px 10px; border-radius: 999px; background: rgba(34,211,238,.1); color: var(--accent); border: 1px solid rgba(34,211,238,.25); }
.quiz-card h2 { font-size: 16px; line-height: 1.7; margin-bottom: 18px; font-weight: 600; }
.options { display: flex; flex-direction: column; gap: 10px; }
.option {
  display: flex; align-items: center; gap: 12px;
  background: rgba(2,6,23,.6); border: 1px solid var(--border); border-radius: 11px;
  padding: 12px 14px; cursor: pointer; transition: all .12s;
}
.option:hover { border-color: rgba(34,211,238,.5); }
.option .opt-label {
  width: 26px; height: 26px; border-radius: 8px; flex-shrink: 0;
  background: var(--panel-2); border: 1px solid #334155;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: var(--accent);
}
.option.selected { border-color: var(--accent); background: rgba(34,211,238,.08); }
.option.correct { border-color: var(--success); background: rgba(52,211,153,.1); }
.option.correct .opt-label { color: var(--success); border-color: var(--success); }
.option.wrong { border-color: var(--danger); background: rgba(251,113,133,.1); }
.option.wrong .opt-label { color: var(--danger); border-color: var(--danger); }
.option.locked { cursor: default; }
.option.locked:hover { border-color: var(--border); }
.option.correct.locked:hover, .option.wrong.locked:hover { border-color: inherit; }
.fill-input, .text-input {
  width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 14px; color: var(--text); font-size: 14px; outline: none; margin-bottom: 10px;
}
.fill-input:focus, .text-input:focus { border-color: var(--accent); }
textarea.text-input { resize: vertical; min-height: 90px; }
.analysis {
  margin-top: 18px; padding: 14px 16px; border-radius: 11px;
  background: rgba(2,6,23,.6); border: 1px solid var(--border); font-size: 13px;
}
.analysis .ans-line { color: var(--success); font-weight: 600; margin-bottom: 6px; }
.analysis .ans-line.wrong { color: var(--danger); }
.analysis .ana-line { color: var(--muted); }
.order-seq { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; min-height: 34px; }
.order-chip {
  background: rgba(34,211,238,.12); border: 1px solid rgba(34,211,238,.4); color: var(--accent);
  border-radius: 8px; padding: 4px 12px; font-weight: 700; font-size: 13px;
}

/* 答题卡 */
.answer-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; position: sticky; top: 76px; }
.answer-card h3 { font-size: 13px; margin-bottom: 10px; }
.legend { display: flex; gap: 12px; font-size: 11px; color: var(--muted); padding-bottom: 10px; border-bottom: 1px solid var(--border); margin-bottom: 12px; flex-wrap: wrap; }
.legend i { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }
.card-group { margin-bottom: 12px; }
.card-group .cg-title { font-size: 11px; color: var(--accent); display: flex; justify-content: space-between; padding-bottom: 6px; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.card-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.card-num {
  aspect-ratio: 1; border-radius: 8px; border: 1px solid var(--border);
  background: rgba(2,6,23,.6); color: var(--muted); font-size: 12px; font-weight: 600;
  display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .12s;
}
.card-num:hover { border-color: var(--accent); }
.card-num.right { background: rgba(52,211,153,.15); border-color: rgba(52,211,153,.5); color: var(--success); }
.card-num.wrong { background: rgba(251,113,133,.15); border-color: rgba(251,113,133,.5); color: var(--danger); }
.card-num.answered-exam { background: rgba(34,211,238,.15); border-color: rgba(34,211,238,.5); color: var(--accent); }
.card-num.current { outline: 2px solid var(--accent); outline-offset: 1px; }

/* 成绩/结果 */
.result-card { max-width: 640px; margin: 30px auto; background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 36px; text-align: center; }
.result-card .big-emoji { font-size: 40px; margin-bottom: 10px; }
.result-card h2 { font-size: 22px; margin-bottom: 6px; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 22px 0; }
.stat-box { background: rgba(2,6,23,.6); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.stat-box .stat-label { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.stat-box .stat-value { font-size: 20px; font-weight: 700; color: var(--accent); }
.stat-box .stat-value.green { color: var(--success); }
.breakdown { text-align: left; margin-bottom: 22px; }
.breakdown h4 { font-size: 12px; color: var(--muted); margin-bottom: 10px; }
.breakdown-row { display: flex; justify-content: space-between; align-items: center; background: rgba(2,6,23,.6); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; margin-bottom: 8px; font-size: 13px; }
.result-actions { display: flex; gap: 10px; }
.result-actions .btn { flex: 1; }

/* 错题簿 */
.mistake-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.mistake-tab { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--border); background: var(--panel); color: var(--muted); font-size: 13px; cursor: pointer; }
.mistake-tab.active { border-color: var(--danger); color: var(--danger); background: rgba(251,113,133,.08); }
.mistake-item { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 12px; }
.mistake-item .mi-head { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.mistake-item .mi-title { font-size: 14px; font-weight: 600; line-height: 1.6; }
.mi-meta { font-size: 12px; color: var(--muted); margin-top: 6px; display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.mi-options { margin: 8px 0; }
.mi-options .option { padding: 8px 12px; font-size: 13px; cursor: default; }

/* 考试配置 */
.config-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin-bottom: 16px; }
.config-card h3 { font-size: 15px; margin-bottom: 14px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.form-field { display: flex; flex-direction: column; gap: 5px; }
.form-field label { font-size: 12px; color: var(--muted); }
.form-field input, .form-field select {
  background: var(--bg); border: 1px solid var(--border); border-radius: 9px;
  padding: 8px 12px; color: var(--text); font-size: 13px; outline: none; min-width: 140px;
}
.form-field input:focus { border-color: var(--accent); }
.bank-check { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 9px; cursor: pointer; font-size: 13px; }
.bank-check:hover { border-color: rgba(34,211,238,.4); }
.bank-check input { accent-color: var(--accent); }
.plan-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.plan-table th, .plan-table td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: left; }
.plan-table th { color: var(--muted); font-weight: 500; font-size: 12px; }
.plan-table input { width: 76px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 6px 9px; color: var(--text); font-size: 13px; outline: none; }
.plan-table input:focus { border-color: var(--accent); }
.plan-total { font-size: 13px; color: var(--muted); margin-top: 10px; }
.plan-total b { color: var(--accent); }

/* 考试中 */
.exam-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.exam-timer { font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--accent); }
.exam-timer.danger { color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }

/* 考试结果/回顾 */
.review-item { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 12px; }
.review-item .ri-head { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; font-size: 13px; }
.review-item .ri-title { font-size: 14px; font-weight: 600; line-height: 1.6; margin-bottom: 8px; }
.ri-score { margin-left: auto; font-size: 12px; color: var(--muted); }
.ri-score.got { color: var(--success); }
.ri-score.miss { color: var(--danger); }

/* 管理后台 */
.admin-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.admin-tab { padding: 7px 16px; border-radius: 999px; border: 1px solid var(--border); background: var(--panel); color: var(--muted); font-size: 13px; cursor: pointer; }
.admin-tab.active { border-color: var(--accent); color: var(--accent); }
.table-wrap { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: 13px; }
table.data th, table.data td { padding: 11px 14px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
table.data th { color: var(--muted); font-weight: 500; font-size: 12px; background: rgba(2,6,23,.4); }
table.data tr:last-child td { border-bottom: none; }
table.data .row-actions { display: flex; gap: 6px; }
.add-form { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; margin-top: 14px; }

/* 弹窗 */
.modal-mask { position: fixed; inset: 0; background: rgba(2,6,23,.75); backdrop-filter: blur(3px); z-index: 100; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 24px; width: 420px; max-width: 100%; max-height: 88vh; overflow-y: auto; box-shadow: 0 24px 70px rgba(0,0,0,.6); }
.modal h3 { font-size: 16px; margin-bottom: 16px; }
.modal .modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.modal input[type=text], .modal input[type=password], .modal input[type=number], .modal select {
  width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 9px;
  padding: 9px 12px; color: var(--text); font-size: 13px; outline: none; margin-bottom: 10px;
}
.modal input:focus { border-color: var(--accent); }
.modal .field-label { font-size: 12px; color: var(--muted); margin-bottom: 4px; display: block; }
.radio-row { display: flex; gap: 10px; margin-bottom: 12px; }
.radio-row label { flex: 1; display: flex; align-items: center; gap: 7px; border: 1px solid var(--border); border-radius: 9px; padding: 9px 12px; font-size: 13px; cursor: pointer; }
.radio-row label:hover { border-color: rgba(34,211,238,.4); }
.radio-row input { accent-color: var(--accent); }
.file-drop { border: 1px dashed var(--border); border-radius: 10px; padding: 18px; text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 12px; cursor: pointer; }
.file-drop:hover { border-color: var(--accent); }
.file-drop.has-file { color: var(--accent); border-color: rgba(34,211,238,.4); }
.imp-file-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; max-height: 180px; overflow-y: auto; }
.imp-file-item { display: flex; align-items: center; justify-content: space-between; gap: 8px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 13px; }
.imp-file-item span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conflict-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; max-height: 46vh; overflow-y: auto; }
.conflict-row { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 12px; }
.conflict-file { font-size: 13px; font-weight: 600; margin-bottom: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conflict-msg { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.conflict-opts { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; margin-bottom: 8px; }
.conflict-opts label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.conflict-rename { width: 100%; }
.conflict-rename:disabled { opacity: .45; }
.conflict-tip { font-size: 12px; color: var(--muted); margin-bottom: 14px; line-height: 1.6; }

/* Toast */
.toast-root { position: fixed; top: 74px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast {
  background: var(--panel); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 10px; padding: 10px 18px; font-size: 13px; color: var(--text);
  box-shadow: 0 10px 34px rgba(0,0,0,.5); animation: toast-in .2s ease;
  max-width: 80vw;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } }

/* 历史记录 */
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-row { display: flex; align-items: center; gap: 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 10px 16px; font-size: 13px; flex-wrap: wrap; }
.history-row .hr-acc { margin-left: auto; font-weight: 600; }
.history-row .hr-acc.good { color: var(--success); }
.history-row .hr-acc.mid { color: var(--warn); }
.history-row .hr-acc.bad { color: var(--danger); }

/* 备案号 footer */
.site-footer {
  width: 100%;
  margin-top: 36px;
  padding: 18px 20px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.site-footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color .15s;
}
.site-footer a:hover { color: var(--accent); text-decoration: underline; }

@media (max-width: 640px) {
  .topbar { padding: 10px 14px; }
  main { padding: 16px 12px 40px; }
  .quiz-card { padding: 18px; }
  .stat-grid { grid-template-columns: 1fr; }
  .site-footer { padding: 14px 12px; font-size: 11px; }
}