/* ══════════════════════════════════════════════════════════════
   政治冲刺 — 游戏化深色主题 CSS
   ══════════════════════════════════════════════════════════════ */

/* ── CSS 变量 ─────────────────────────────────────────────── */
:root {
  --bg:          #0d0d1a;
  --bg2:         #12122a;
  --glass:       rgba(255,255,255,0.05);
  --glass-border:rgba(255,255,255,0.10);
  --glass-hover: rgba(255,255,255,0.09);

  --purple:      #8b5cf6;
  --purple-l:    #a78bfa;
  --cyan:        #06b6d4;
  --green:       #10b981;
  --orange:      #f59e0b;
  --red:         #ef4444;

  --text:        #e2e8f0;
  --text-muted:  #94a3b8;
  --text-dim:    #475569;

  --radius:      14px;
  --radius-sm:   8px;
  --shadow:      0 8px 32px rgba(0,0,0,0.5);
  --glow-purple: 0 0 20px rgba(139,92,246,0.35);
  --glow-cyan:   0 0 20px rgba(6,182,212,0.35);

  --transition:  all 0.2s ease;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}
a { color: var(--purple-l); text-decoration: none; }
a:hover { color: var(--cyan); }
button { cursor: pointer; font-family: inherit; }
textarea, input, select { font-family: inherit; }

/* ── 背景 canvas ─────────────────────────────────────────── */
#bg-canvas {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none; opacity: 0.6;
}

/* ── 容器 ────────────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
  position: relative; z-index: 1;
}

/* ── 玻璃卡片 ────────────────────────────────────────────── */
.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

/* ══════════════════════════════════════════════════════════════
   HEADER
   ══════════════════════════════════════════════════════════════ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,13,26,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 10px 20px;
  display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-icon { font-size: 1.5rem; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-sub   { font-size: .65rem; color: var(--text-muted); letter-spacing: .1em; text-transform: uppercase; }
.brand-title { font-size: 1rem; font-weight: 700; color: var(--purple-l); }

/* 科目 tabs */
.subject-tabs {
  display: flex; gap: 4px; flex-wrap: wrap; flex: 1;
}
.subject-tab {
  padding: 4px 10px; border-radius: 20px; font-size: .75rem;
  color: var(--text-muted); border: 1px solid transparent;
  transition: var(--transition);
}
.subject-tab:hover { color: var(--text); background: var(--glass); }
.subject-tab.active {
  color: var(--purple-l); background: rgba(139,92,246,0.15);
  border-color: rgba(139,92,246,0.4);
}

/* 功能导航 */
.func-nav {
  max-width: 1200px; margin: 0 auto;
  padding: 0 20px 8px;
  display: flex; gap: 4px; overflow-x: auto;
  scrollbar-width: none;
}
.func-nav::-webkit-scrollbar { display: none; }
.func-item {
  padding: 5px 12px; border-radius: 20px; font-size: .8rem;
  color: var(--text-muted); white-space: nowrap;
  transition: var(--transition);
}
.func-item:hover { color: var(--text); background: var(--glass); }
.func-item.active {
  color: var(--cyan); background: rgba(6,182,212,0.12);
  border: 1px solid rgba(6,182,212,0.3);
}

/* 右侧操作 */
.header-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.user-badge {
  font-size: .8rem; color: var(--text-muted);
  padding: 4px 10px; border-radius: 20px;
  background: var(--glass);
}

/* ══════════════════════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════════════════════ */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 20px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--purple), #6d28d9);
  color: #fff; font-weight: 600; font-size: .9rem;
  border: none; box-shadow: var(--glow-purple);
  transition: var(--transition);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(139,92,246,0.5);
  color: #fff;
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-full { width: 100%; }

.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px 16px; border-radius: var(--radius-sm);
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--glass-border); font-size: .85rem;
  transition: var(--transition);
}
.btn-ghost:hover { background: var(--glass); color: var(--text); }

.btn-danger {
  padding: 6px 12px; border-radius: var(--radius-sm);
  background: rgba(239,68,68,0.15); color: var(--red);
  border: 1px solid rgba(239,68,68,0.3); font-size: .8rem;
  transition: var(--transition);
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn-sm { padding: 5px 10px; font-size: .78rem; }

/* ══════════════════════════════════════════════════════════════
   FORMS
   ══════════════════════════════════════════════════════════════ */
.input-field {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06); border: 1px solid var(--glass-border);
  color: var(--text); font-size: .9rem;
  transition: var(--transition);
  appearance: none;
}
.input-field:focus {
  outline: none; border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.2);
  background: rgba(255,255,255,0.09);
}
.input-field::placeholder { color: var(--text-dim); }
.select-sm {
  padding: 6px 10px; border-radius: 20px; font-size: .8rem;
  background: rgba(255,255,255,0.06); border: 1px solid var(--glass-border);
  color: var(--text); cursor: pointer;
}
textarea.input-field { resize: vertical; }
.textarea-sm  { min-height: 80px; }
.textarea-md  { min-height: 120px; }
.textarea-lg  { min-height: 180px; }
.textarea-xl  { min-height: 260px; }
.input-sm { width: auto; min-width: 180px; }

.field-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.field-group label { font-size: .85rem; color: var(--text-muted); font-weight: 500; }
.field-hint { font-size: .75rem; color: var(--text-dim); }
.required { color: var(--red); }
.form-row { display: flex; gap: 16px; }
.form-row .flex-1 { flex: 1; }
.form-actions { display: flex; gap: 10px; margin-top: 8px; }

/* ══════════════════════════════════════════════════════════════
   FLASH 消息
   ══════════════════════════════════════════════════════════════ */
.flash-container {
  position: fixed; top: 90px; right: 20px; z-index: 999;
  display: flex; flex-direction: column; gap: 8px;
  transition: opacity 0.5s;
}
.flash-msg {
  padding: 12px 20px; border-radius: var(--radius-sm);
  background: rgba(139,92,246,0.9); color: #fff;
  font-size: .92rem; box-shadow: var(--shadow);
  animation: slideIn .25s ease;
  backdrop-filter: blur(8px);
}
.flash-msg.error {
  background: rgba(239,68,68,0.9);
}
@keyframes slideIn {
  from { opacity:0; transform: translateX(20px); }
  to   { opacity:1; transform: translateX(0); }
}

/* ══════════════════════════════════════════════════════════════
   AUTH 页面
   ══════════════════════════════════════════════════════════════ */
.auth-page {
  min-height: calc(100vh - 50px);
  display: flex; align-items: center; justify-content: center;
  padding: 12px 16px; position: relative; z-index: 1;
  overflow-y: auto;
}
.auth-card {
  width: 100%; max-width: 400px;
  padding: 24px 28px;
  margin: auto;
}
.auth-header { text-align: center; margin-bottom: 16px; }
.auth-logo { font-size: 1.8rem; display: block; margin-bottom: 6px; }
.auth-header h1 { font-size: 1.4rem; color: var(--purple-l); }
.auth-sub { color: var(--text-muted); font-size: .85rem; margin-top: 2px; }
.auth-form { display: flex; flex-direction: column; gap: 10px; }
.auth-form .field-group { margin-bottom: 0; gap: 4px; }
.auth-link { text-align: center; margin-top: 12px; font-size: .85rem; color: var(--text-muted); }

/* ══════════════════════════════════════════════════════════════
   HOME 页面
   ══════════════════════════════════════════════════════════════ */
.home-page { padding: 28px 0 60px; }
.dashboard-row {
  display: grid; grid-template-columns: repeat(4,1fr); gap: 14px;
  margin-bottom: 32px;
}
@media(max-width:640px) { .dashboard-row { grid-template-columns: repeat(2,1fr); } }

.stat-card {
  padding: 22px; text-align: center;
  transition: var(--transition); cursor: default;
}
.stat-card:hover { transform: translateY(-3px); }
.stat-icon { font-size: 1.6rem; margin-bottom: 8px; }
.stat-val   { font-size: 2rem; font-weight: 800; line-height: 1; }
.stat-label { font-size: .78rem; color: var(--text-muted); margin-top: 4px; }
.accent-purple .stat-val { color: var(--purple-l); }
.accent-cyan   .stat-val { color: var(--cyan); }
.accent-green  .stat-val { color: var(--green); }
.accent-orange .stat-val { color: var(--orange); }

.section-title {
  font-size: 1rem; font-weight: 700; color: var(--text-muted);
  letter-spacing: .08em; text-transform: uppercase;
  margin-bottom: 14px;
}

/* 模式网格 */
.mode-grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 14px;
  margin-bottom: 32px;
}
@media(max-width:640px) { .mode-grid { grid-template-columns: repeat(2,1fr); } }

.mode-card {
  padding: 22px 18px; display: flex; flex-direction: column; gap: 6px;
  transition: var(--transition); border-left: 3px solid transparent;
}
.mode-card:hover { transform: translateY(-4px); box-shadow: var(--glow-purple); }
.mode-icon  { font-size: 1.8rem; }
.mode-name  { font-size: 1rem; font-weight: 700; color: var(--text); }
.mode-desc  { font-size: .78rem; color: var(--text-muted); }
.mode-badge {
  display: inline-block; margin-top: 6px;
  padding: 2px 8px; border-radius: 20px; font-size: .7rem; font-weight: 600;
  background: rgba(139,92,246,0.2); color: var(--purple-l);
}
.mode-study  { border-left-color: var(--purple); }
.mode-fill   { border-left-color: var(--cyan); }
.mode-mcq    { border-left-color: var(--green); }
.mode-dati   { border-left-color: var(--orange); }
.mode-wrong  { border-left-color: var(--red); }
.mode-add    { border-left-color: var(--text-dim); }

.chart-card { padding: 20px; }

/* ── 各科目掌握进度 ─────────────────────────────────────────── */
.subject-progress-grid {
  padding: 20px 24px; display: flex; flex-direction: column; gap: 14px;
}
.subj-row {
  display: grid; grid-template-columns: 1fr auto;
  grid-template-rows: auto auto; gap: 4px 8px; align-items: center;
}
.subj-meta {
  grid-column: 1; display: flex; justify-content: space-between;
  align-items: baseline;
}
.subj-name { font-size: .9rem; font-weight: 600; color: var(--text); }
.subj-nums { font-size: .78rem; color: var(--text-dim); }
.subj-due  { color: #f87171; margin-left: 4px; }
.subj-bar-wrap {
  grid-column: 1; height: 7px; background: rgba(255,255,255,0.08);
  border-radius: 4px; overflow: hidden;
}
.subj-bar {
  height: 100%; background: linear-gradient(90deg, var(--purple), var(--cyan));
  border-radius: 4px; transition: width .6s ease;
  min-width: 2px;
}
.subj-pct {
  grid-column: 2; grid-row: 1 / 3; font-size: .82rem;
  color: var(--purple-l); font-weight: 600; text-align: right; min-width: 36px;
}

/* ══════════════════════════════════════════════════════════════
   STUDY / CARD 页面
   ══════════════════════════════════════════════════════════════ */
.study-page, .fillblank-page, .mcq-page { padding: 24px 0 60px; }
.study-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 20px;
}
.meta-badge {
  padding: 5px 12px; border-radius: 20px; font-size: .8rem;
  background: rgba(139,92,246,0.15); color: var(--purple-l);
  border: 1px solid rgba(139,92,246,0.3);
}
.meta-badge.warn { background: rgba(239,68,68,0.12); color: #fca5a5; border-color: rgba(239,68,68,0.3); }

/* 翻转卡片 */
.card-scene {
  perspective: 1200px; margin: 0 auto 24px; max-width: 680px;
}
.flip-card {
  width: 100%; min-height: 340px; position: relative;
  transform-style: preserve-3d; transition: transform 0.55s cubic-bezier(.4,0,.2,1);
  cursor: pointer;
}
.flip-card.flipped { transform: rotateY(180deg); }
.card-face {
  position: absolute; inset: 0; border-radius: var(--radius);
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; padding: 32px;
}
.card-back { transform: rotateY(180deg); }

/* 正面 */
.card-front { align-items: center; justify-content: center; text-align: center; }
.card-subject-tag { margin-bottom: 16px; }
.card-concept { font-size: 1.6rem; font-weight: 800; color: var(--purple-l); line-height: 1.3; }
.card-hint { margin-top: 24px; font-size: .8rem; color: var(--text-dim); }

/* 背面 */
.card-back-concept { font-size: 1rem; font-weight: 700; color: var(--purple-l); margin-bottom: 12px; }
.card-content { font-size: 1rem; color: var(--text); line-height: 1.8; flex: 1; }
.card-example {
  margin-top: 16px; padding: 12px 16px;
  background: rgba(6,182,212,0.08); border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.example-label { font-size: .78rem; font-weight: 700; color: var(--cyan); display: block; margin-bottom: 4px; }
.card-example p { font-size: .88rem; color: var(--text-muted); }

/* 评分按钮 */
.rating-btns {
  display: flex; gap: 8px; margin-top: 20px; flex-wrap: wrap;
}
.rating-btn {
  flex: 1; min-width: 80px; padding: 10px 8px; border-radius: var(--radius-sm);
  font-size: .85rem; font-weight: 600; border: none;
  transition: var(--transition);
}
.btn-again { background: rgba(239,68,68,0.2);  color: #fca5a5; }
.btn-hard  { background: rgba(245,158,11,0.2); color: #fcd34d; }
.btn-good  { background: rgba(16,185,129,0.2); color: #6ee7b7; }
.btn-easy  { background: rgba(6,182,212,0.2);  color: #67e8f9; }
.btn-again:hover { background: rgba(239,68,68,0.4); transform: translateY(-2px); }
.btn-hard:hover  { background: rgba(245,158,11,0.4); transform: translateY(-2px); }
.btn-good:hover  { background: rgba(16,185,129,0.4); transform: translateY(-2px); }
.btn-easy:hover  { background: rgba(6,182,212,0.4); transform: translateY(-2px); }
.rating-btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }

.streak-row { text-align: center; min-height: 36px; }
.next-hint {
  display: inline-block; padding: 6px 16px; border-radius: 20px;
  font-size: .85rem; background: rgba(255,255,255,0.07); color: var(--text-muted);
  animation: fadeUp .3s ease;
}
@keyframes fadeUp {
  from { opacity:0; transform: translateY(8px); }
  to   { opacity:1; transform: translateY(0); }
}

/* ══════════════════════════════════════════════════════════════
   FILLBLANK 页面
   ══════════════════════════════════════════════════════════════ */
.fillblank-card { padding: 32px; max-width: 720px; margin: 0 auto; }
.fb-concept {
  font-size: 1.25rem; font-weight: 800; color: var(--purple-l);
  margin-bottom: 20px;
}
.fb-text {
  font-size: 1rem; line-height: 2.2; color: var(--text);
  margin-bottom: 24px;
}
.blank-input {
  display: inline-block;
  width: 100px; min-width: 80px;
  padding: 2px 8px; margin: 0 4px;
  border: none; border-bottom: 2px solid var(--purple);
  background: rgba(139,92,246,0.1); border-radius: 4px;
  color: var(--text); font-size: inherit; text-align: center;
  transition: var(--transition);
}
.blank-input:focus { outline: none; border-color: var(--cyan); background: rgba(6,182,212,0.1); }
.blank-input.input-correct { border-color: var(--green); background: rgba(16,185,129,0.15); color: var(--green); }
.blank-input.input-wrong   { border-color: var(--red);   background: rgba(239,68,68,0.12);  color: #fca5a5; }
.blank-hint {
  display: inline-block; margin: 0 4px;
  font-size: .8rem; color: var(--green); font-weight: 600;
}
.fb-no-blank { color: var(--text-muted); font-style: italic; }
.fb-content-preview {
  padding: 14px 16px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04); color: var(--text-muted);
  font-size: .95rem; line-height: 1.8;
}
.fb-actions { display: flex; gap: 10px; margin-top: 20px; }

.result-correct {
  padding: 12px 20px; border-radius: var(--radius-sm); margin-bottom: 16px;
  background: rgba(16,185,129,0.15); color: var(--green);
  border: 1px solid rgba(16,185,129,0.3); font-weight: 600;
  animation: fadeUp .3s ease;
}
.result-wrong {
  padding: 12px 20px; border-radius: var(--radius-sm); margin-bottom: 16px;
  background: rgba(239,68,68,0.12); color: #fca5a5;
  border: 1px solid rgba(239,68,68,0.3); font-weight: 600;
  animation: fadeUp .3s ease;
}

/* ══════════════════════════════════════════════════════════════
   MCQ 页面
   ══════════════════════════════════════════════════════════════ */
.mcq-card { padding: 32px; max-width: 720px; margin: 0 auto; }
.mcq-question {
  font-size: 1.05rem; line-height: 1.8; color: var(--text);
  margin-bottom: 24px; white-space: pre-line;
}
.mcq-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.mcq-option {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 18px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04); border: 1px solid var(--glass-border);
  color: var(--text); font-size: .95rem; text-align: left;
  transition: var(--transition);
}
.mcq-option:hover:not(:disabled) {
  background: rgba(139,92,246,0.12); border-color: rgba(139,92,246,0.4);
  transform: translateX(4px);
}
.mcq-option.selected {
  background: rgba(139,92,246,0.18); border-color: var(--purple);
  box-shadow: var(--glow-purple);
}
.mcq-option.opt-correct {
  background: rgba(16,185,129,0.15) !important; border-color: var(--green) !important; color: var(--green);
}
.mcq-option.opt-wrong {
  background: rgba(239,68,68,0.12) !important; border-color: var(--red) !important; color: #fca5a5;
}
.mcq-option:disabled { cursor: not-allowed; }
.opt-letter {
  flex-shrink: 0; width: 28px; height: 28px;
  border-radius: 50%; background: rgba(139,92,246,0.2);
  color: var(--purple-l); font-weight: 700; font-size: .85rem;
  display: flex; align-items: center; justify-content: center;
}
.mcq-actions { margin-top: 16px; }

/* ══════════════════════════════════════════════════════════════
   知识库 / 编辑 页面
   ══════════════════════════════════════════════════════════════ */
.points-page, .edit-page, .dati-page, .dati-detail-page { padding: 24px 0 60px; }

.toolbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 14px 18px; margin-bottom: 16px;
}
.toolbar-form { display: flex; align-items: center; gap: 8px; flex: 1; flex-wrap: wrap; }

.chapter-quick-add {
  display: flex; gap: 8px; align-items: center;
  margin-bottom: 16px;
}

.points-list { display: flex; flex-direction: column; gap: 10px; }
.point-row {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 16px 20px; transition: var(--transition);
}
.point-row:hover { background: var(--glass-hover); }
.point-main { flex: 1; }
.point-concept { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.point-content { font-size: .85rem; color: var(--text-muted); line-height: 1.5; }
.point-chapter  { font-size: .75rem; color: var(--text-dim); margin-top: 4px; }
.point-meta { display: flex; align-items: center; gap: 8px; flex-shrink: 0; flex-wrap: wrap; justify-content: flex-end; }

.state-badge {
  padding: 2px 8px; border-radius: 20px; font-size: .72rem; font-weight: 600;
}
.state-new      { background: rgba(148,163,184,0.15); color: var(--text-dim); }
.state-learning { background: rgba(245,158,11,0.15);  color: #fcd34d; }
.state-review   { background: rgba(6,182,212,0.15);   color: var(--cyan); }
.state-mastered { background: rgba(16,185,129,0.15);  color: var(--green); }
.lapse-badge {
  padding: 2px 8px; border-radius: 20px; font-size: .72rem;
  background: rgba(239,68,68,0.15); color: #fca5a5;
}

/* 编辑页 */
.edit-card { padding: 32px; max-width: 720px; margin: 0 auto; }
.edit-title { font-size: 1.2rem; font-weight: 800; margin-bottom: 24px; color: var(--purple-l); }
.edit-form {}
.fillblank-section {
  border-top: 1px solid var(--glass-border);
  margin-top: 8px; padding-top: 20px;
}
.section-subtitle { font-size: .9rem; color: var(--cyan); margin-bottom: 16px; }

/* ══════════════════════════════════════════════════════════════
   大题页面
   ══════════════════════════════════════════════════════════════ */
.dati-grid {
  display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin-top: 8px;
}
@media(max-width:600px) { .dati-grid { grid-template-columns: 1fr; } }

.dati-card {
  padding: 20px 22px; display: flex; flex-direction: column; gap: 10px;
  transition: var(--transition); color: var(--text);
}
.dati-card:hover { transform: translateY(-3px); box-shadow: var(--glow-cyan); color: var(--text); }
.dati-meta-top { display: flex; gap: 8px; }
.dati-title { font-size: .95rem; font-weight: 600; line-height: 1.4; }
.dati-arrow { color: var(--text-dim); margin-top: auto; }

.subject-tag {
  padding: 2px 8px; border-radius: 20px; font-size: .72rem;
  background: rgba(139,92,246,0.15); color: var(--purple-l);
}
.year-tag {
  padding: 2px 8px; border-radius: 20px; font-size: .72rem;
  background: rgba(245,158,11,0.15); color: var(--orange);
}

/* 大题详情 */
.dati-detail-card { padding: 36px; max-width: 780px; margin: 0 auto; }
.dati-detail-meta { display: flex; gap: 8px; margin-bottom: 12px; }
.dati-detail-title { font-size: 1.3rem; font-weight: 800; line-height: 1.4; }
.dati-section { margin-top: 24px; }
.dati-section-label { font-size: .85rem; color: var(--cyan); font-weight: 700; margin-bottom: 10px; letter-spacing: .05em; text-transform: uppercase; }
.dati-materials {
  padding: 16px 20px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04); color: var(--text-muted);
  font-size: .9rem; line-height: 1.9; white-space: pre-line;
}
.dati-framework {
  padding: 20px 24px; border-radius: var(--radius-sm);
  background: rgba(139,92,246,0.06); border-left: 4px solid var(--purple);
  color: var(--text); font-size: .95rem; line-height: 2; white-space: pre-line;
}
/* 框架遮罩：默认覆盖整个答题框架区域 */
.fw-mask {
  position: absolute; inset: 0;
  background: rgba(15, 15, 30, 0.92);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(2px);
}
.dati-practice { margin-top: 28px; border-top: 1px solid var(--glass-border); padding-top: 20px; }
.dati-actions { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }

/* ══════════════════════════════════════════════════════════════
   标签
   ══════════════════════════════════════════════════════════════ */
.tag-hot { padding: 2px 7px; border-radius: 20px; font-size:.7rem; font-weight:700; background:rgba(239,68,68,0.18); color:#fca5a5; margin-left:6px; }
.tag-mid { padding: 2px 7px; border-radius: 20px; font-size:.7rem; font-weight:700; background:rgba(245,158,11,0.15); color:#fcd34d; margin-left:6px; }
.tag-low { padding: 2px 7px; border-radius: 20px; font-size:.7rem; font-weight:700; background:rgba(148,163,184,0.1); color:var(--text-dim); margin-left:6px; }

/* ══════════════════════════════════════════════════════════════
   成就 / 连击
   ══════════════════════════════════════════════════════════════ */
.achievement-modal {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
  opacity: 0; transition: opacity .3s;
  pointer-events: none;   /* 默认不拦截点击 */
}
.achievement-modal[hidden] { display: none !important; }  /* 彻底隐藏时不占位 */
.achievement-modal.show { opacity: 1; pointer-events: auto; }
.achievement-card {
  background: var(--bg2); border: 1px solid var(--glass-border);
  border-radius: var(--radius); padding: 40px 36px;
  text-align: center; max-width: 340px; width: 90%;
  box-shadow: var(--glow-purple), var(--shadow);
  animation: popIn .3s cubic-bezier(.4,0,.2,1);
}
@keyframes popIn {
  from { transform: scale(.85); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}
.achievement-icon { font-size: 3.5rem; display: block; margin-bottom: 12px; }
.achievement-card h3 { font-size: 1.2rem; margin-bottom: 8px; color: var(--purple-l); }
.achievement-card p  { color: var(--text-muted); margin-bottom: 20px; }

.combo-display {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%,-50%);
  z-index: 9998; pointer-events: none;
  font-size: 2.4rem; font-weight: 900; color: var(--orange);
  text-shadow: 0 0 20px rgba(245,158,11,0.8);
}
.combo-display.pop {
  animation: comboPop .6s cubic-bezier(.4,0,.2,1) forwards;
}
@keyframes comboPop {
  0%   { transform: translate(-50%,-50%) scale(0.5); opacity:0; }
  40%  { transform: translate(-50%,-50%) scale(1.3); opacity:1; }
  70%  { transform: translate(-50%,-50%) scale(1); }
  100% { transform: translate(-50%,-50%) scale(1); opacity:0; }
}

/* ══════════════════════════════════════════════════════════════
   彩屑
   ══════════════════════════════════════════════════════════════ */
.confetti-piece {
  position: fixed; top: -12px; z-index: 9997;
  animation: confettiFall linear forwards;
  pointer-events: none;
}
@keyframes confettiFall {
  to { transform: translateY(110vh) rotate(720deg); opacity: 0; }
}

/* ══════════════════════════════════════════════════════════════
   空状态 / 分页 / 通用
   ══════════════════════════════════════════════════════════════ */
.empty-state {
  text-align: center; padding: 60px 32px; max-width: 440px;
  margin: 40px auto;
}
.empty-icon { font-size: 3.5rem; margin-bottom: 16px; display: block; }
.empty-state h2 { font-size: 1.2rem; margin-bottom: 8px; }
.empty-state p   { color: var(--text-muted); margin-bottom: 20px; }
.empty-inline { text-align: center; color: var(--text-dim); padding: 24px; }

.pagination { display: flex; gap: 6px; justify-content: center; margin-top: 24px; flex-wrap: wrap; }
.page-btn {
  padding: 6px 12px; border-radius: var(--radius-sm);
  background: var(--glass); color: var(--text-muted);
  border: 1px solid var(--glass-border); font-size: .85rem;
  transition: var(--transition);
}
.page-btn:hover { color: var(--text); background: rgba(255,255,255,0.1); }
.page-btn.active { background: rgba(139,92,246,0.2); color: var(--purple-l); border-color: var(--purple); }

/* ══════════════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════════════ */
.site-footer {
  text-align: center; padding: 20px;
  color: var(--text-dim); font-size: .78rem;
  position: relative; z-index: 1;
}

.site-footer-icp {
  margin-top: 8px;
}

.site-footer-icp a {
  color: inherit;
  text-decoration: none;
}

.site-footer-icp a:hover {
  text-decoration: underline;
}

/* ══════════════════════════════════════════════════════════════
   主内容区
   ══════════════════════════════════════════════════════════════ */
.page-main { position: relative; z-index: 1; }

/* ══════════════════════════════════════════════════════════════
   响应式
   ══════════════════════════════════════════════════════════════ */
@media(max-width:768px) {
  .header-inner { flex-wrap: wrap; }
  .subject-tabs { order: 3; width: 100%; }
  .flip-card { min-height: 280px; }
  .card-face { padding: 20px; }
  .card-concept { font-size: 1.3rem; }
  .edit-card, .mcq-card, .fillblank-card, .dati-detail-card { padding: 20px; }
  .form-row { flex-direction: column; }
  .rating-btns { flex-wrap: wrap; }
  .rating-btn { min-width: calc(50% - 4px); }
}