/* ============================================
   DELTA TACTICAL - 五升六30天全能打卡工作台
   三角洲战术风格 · 深炭灰 + 军绿
   ============================================ */

/* ===== CSS变量 ===== */
:root {
  --bg-dark: #1a1d1a;
  --bg-darker: #12151200;
  --bg-card: #232722;
  --bg-card-hover: #2a2f29;
  --bg-input: #1a1d1a;
  --military-green: #8BC34A;
  --military-green-dark: #689F38;
  --military-green-light: #AED581;
  --military-olive: #556B2F;
  --tactical-gray: #3a3d3a;
  --tactical-gray-light: #4a4d4a;
  --text-primary: #E8EAE0;
  --text-secondary: #9CA39A;
  --text-muted: #6B6F68;
  --accent-red: #E53935;
  --accent-amber: #FFA726;
  --accent-cyan: #26A69A;
  --border-color: #3a3d3a;
  --border-active: #8BC34A;
  --radius: 4px;
  --radius-sm: 2px;
  --radius-lg: 8px;
  --transition: all 0.2s ease;
  --shadow: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);
  --nav-width: 180px;
  --nav-width-collapsed: 56px;
  --topbar-height: 52px;
}

/* ===== 重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
*::before, *::after { box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
  -webkit-user-select: none;
}

/* ===== 战术背景层 ===== */
.tactical-grid-bg {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: 
    linear-gradient(rgba(139,195,74,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,195,74,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: 0;
}

.tactical-camo-bg {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(85,107,47,0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(85,107,47,0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(139,195,74,0.02) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ===== 顶部设置栏 ===== */
.top-bar {
  height: var(--topbar-height);
  background: linear-gradient(180deg, #1e221e 0%, #1a1d1a 100%);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: relative;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.delta-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 28px;
  height: 28px;
  filter: drop-shadow(0 0 4px rgba(139,195,74,0.4));
}

.logo-text {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--text-primary);
}

.logo-accent {
  color: var(--military-green);
  margin-left: 2px;
}

.day-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background: rgba(139,195,74,0.1);
  border: 1px solid rgba(139,195,74,0.2);
  border-radius: var(--radius);
}

.day-label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.day-number {
  font-size: 15px;
  font-weight: 800;
  color: var(--military-green);
}

.day-date {
  font-size: 12px;
  color: var(--text-muted);
  border-left: 1px solid var(--border-color);
  padding-left: 8px;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.top-btn:hover {
  background: rgba(139,195,74,0.1);
  border-color: var(--military-green);
  color: var(--military-green);
}

.top-btn svg {
  flex-shrink: 0;
}

/* ===== 主体布局 ===== */
.main-layout {
  display: flex;
  height: calc(100vh - var(--topbar-height));
  position: relative;
  z-index: 1;
}

/* ===== 左侧导航栏 ===== */
.sidebar {
  width: var(--nav-width);
  background: linear-gradient(180deg, #1e221e 0%, #181b18 100%);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
  transition: var(--transition);
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--tactical-gray);
  border-radius: 2px;
}

.nav-section {
  padding: 8px 0;
  border-bottom: 1px solid rgba(58,61,58,0.5);
}

.nav-section:last-child {
  border-bottom: none;
}

.nav-section-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  padding: 8px 16px 4px;
  font-weight: 600;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 14px;
  background: transparent;
  border: none;
  border-left: 3px solid transparent;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  position: relative;
}

.nav-item:hover {
  background: rgba(139,195,74,0.08);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(139,195,74,0.12);
  border-left-color: var(--military-green);
  color: var(--military-green);
}

.nav-item.active::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background: var(--military-green);
  border-radius: 2px 0 0 2px;
  box-shadow: 0 0 8px rgba(139,195,74,0.5);
}

.nav-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-icon svg {
  width: 20px;
  height: 20px;
}

.nav-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-points {
  font-size: 10px;
  font-weight: 700;
  color: var(--military-green-dark);
  background: rgba(139,195,74,0.1);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.nav-item.active .nav-points {
  color: var(--military-green);
  background: rgba(139,195,74,0.2);
}

.nav-badge {
  font-size: 11px;
  font-weight: 800;
  color: var(--bg-dark);
  background: var(--military-green);
  padding: 2px 8px;
  border-radius: 10px;
  min-width: 28px;
  text-align: center;
  flex-shrink: 0;
  box-shadow: 0 0 8px rgba(139,195,74,0.3);
}

.nav-item-exchange {
  border-left-color: rgba(139,195,74,0.3);
}

.nav-item-exchange:hover {
  background: rgba(139,195,74,0.1);
}

/* ===== 右侧内容区 ===== */
.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  position: relative;
}

.content-area::-webkit-scrollbar {
  width: 6px;
}
.content-area::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
.content-area::-webkit-scrollbar-thumb {
  background: var(--tactical-gray);
  border-radius: 3px;
}

/* ===== 通用卡片 ===== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.section-title-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section-title-icon svg {
  width: 26px;
  height: 26px;
}

.section-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.section-points {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(139,195,74,0.1);
  border: 1px solid rgba(139,195,74,0.2);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 700;
  color: var(--military-green);
}

.tactical-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  transition: var(--transition);
  position: relative;
}

.tactical-card:hover {
  border-color: var(--tactical-gray-light);
  background: var(--bg-card-hover);
}

.tactical-card.completed {
  border-color: var(--military-green-dark);
  background: rgba(139,195,74,0.05);
}

.tactical-card.completed::before {
  content: '✓';
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 20px;
  color: var(--military-green);
  font-weight: bold;
}

/* ===== 生字专区 ===== */
.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.char-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 12px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.char-card:hover {
  border-color: var(--military-green);
  background: var(--bg-card-hover);
}

.char-card .char {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.char-card .pinyin {
  font-size: 14px;
  color: var(--military-green);
  margin-bottom: 4px;
}

.char-card .words {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 6px;
  line-height: 1.6;
}

/* ===== 句子积累 ===== */
.sentence-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--military-green);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.sentence-card .sentence-type {
  font-size: 11px;
  color: var(--military-green);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.sentence-card .sentence-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.sentence-card .sentence-technique {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 8px;
  background: rgba(139,195,74,0.05);
  border-radius: var(--radius-sm);
}

/* ===== 数学计算 ===== */
.math-problems {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.math-problem {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.math-problem .problem-num {
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.math-problem .problem-text {
  font-size: 14px;
  color: var(--text-primary);
  flex: 1;
}

.math-problem .problem-input {
  width: 60px;
  padding: 4px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  text-align: center;
}

.math-problem .problem-input:focus {
  outline: none;
  border-color: var(--military-green);
}

.math-problem.correct {
  border-color: var(--military-green);
  background: rgba(139,195,74,0.08);
}

.math-problem.wrong {
  border-color: var(--accent-red);
  background: rgba(229,57,53,0.08);
}

.math-problem .problem-answer {
  font-size: 12px;
  color: var(--military-green);
  display: none;
}

.math-problem.wrong .problem-answer {
  display: block;
}

/* ===== 英语单词 ===== */
.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.word-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 12px;
  transition: var(--transition);
  cursor: pointer;
}

.word-card:hover {
  border-color: var(--military-green);
}

.word-card .word {
  font-size: 18px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 4px;
}

.word-card .phonetic {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-style: italic;
}

.word-card .meaning {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== 英语阅读 ===== */
.reading-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.reading-card .reading-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 10px;
}

.reading-card .reading-text {
  font-size: 14px;
  line-height: 2;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.reading-card .reading-translation {
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-secondary);
  padding: 10px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
}

/* ===== 物理入门 ===== */
.physics-topic {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.physics-topic .topic-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 8px;
}

.physics-topic .topic-content {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.physics-quiz {
  margin-top: 12px;
}

.quiz-item {
  background: rgba(0,0,0,0.15);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 8px;
}

.quiz-question {
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 8px;
  font-weight: 500;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.quiz-option:hover {
  border-color: var(--military-green);
  color: var(--text-primary);
}

.quiz-option.selected {
  border-color: var(--military-green);
  background: rgba(139,195,74,0.1);
  color: var(--military-green);
}

.quiz-option.correct {
  border-color: var(--military-green);
  background: rgba(139,195,74,0.15);
  color: var(--military-green);
}

.quiz-option.wrong {
  border-color: var(--accent-red);
  background: rgba(229,57,53,0.1);
  color: var(--accent-red);
}

.quiz-explanation {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 8px;
  padding: 8px;
  background: rgba(139,195,74,0.05);
  border-radius: var(--radius-sm);
  display: none;
}

.quiz-item.answered .quiz-explanation {
  display: block;
}

/* ===== 古诗诵读 ===== */
.poem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
  text-align: center;
}

.poem-card .poem-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 4px;
}

.poem-card .poem-author {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.poem-card .poem-text {
  font-size: 17px;
  line-height: 2.2;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.poem-card .poem-notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  text-align: left;
  margin-top: 12px;
  padding: 12px;
  background: rgba(0,0,0,0.15);
  border-radius: var(--radius-sm);
}

.poem-card .poem-notes .notes-label {
  font-size: 12px;
  color: var(--military-green);
  font-weight: 600;
  margin-bottom: 4px;
}

.poem-card .poem-notes .notes-content {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== 道法学习 ===== */
.ethics-topic {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.ethics-topic .topic-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 8px;
}

.ethics-topic .topic-content {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 12px;
  padding: 10px;
  background: rgba(0,0,0,0.15);
  border-radius: var(--radius-sm);
}

/* ===== 运动计划 ===== */
.exercise-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.exercise-item .exercise-info {
  flex: 1;
}

.exercise-item .exercise-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.exercise-item .exercise-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.exercise-item .exercise-points {
  font-size: 12px;
  font-weight: 700;
  color: var(--military-green);
}

.exercise-item .exercise-action {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-end;
}

/* ===== 计时器 ===== */
.timer-display {
  font-size: 28px;
  font-weight: 800;
  color: var(--military-green);
  font-family: 'Courier New', monospace;
  letter-spacing: 2px;
}

.timer-controls {
  display: flex;
  gap: 6px;
}

.timer-btn {
  padding: 4px 10px;
  background: rgba(139,195,74,0.1);
  border: 1px solid var(--military-green-dark);
  border-radius: var(--radius-sm);
  color: var(--military-green);
  font-size: 11px;
  cursor: pointer;
  transition: var(--transition);
}

.timer-btn:hover {
  background: rgba(139,195,74,0.2);
}

.timer-btn.active {
  background: var(--military-green);
  color: var(--bg-dark);
}

/* ===== 矫正计划 ===== */
.correction-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.correction-item .correction-name {
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
}

.correction-item .correction-desc {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== 课外知识 ===== */
.documentary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  display: flex;
  gap: 16px;
}

.documentary-card .doc-info {
  flex: 1;
}

.documentary-card .doc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 4px;
}

.documentary-card .doc-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.documentary-card .doc-link {
  font-size: 12px;
  color: var(--military-green);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.documentary-card .doc-link:hover {
  text-decoration: underline;
}

/* ===== 生活小管家 ===== */
.life-task {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.life-task .life-name {
  flex: 1;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.life-task .life-points {
  font-size: 14px;
  font-weight: 800;
  color: var(--military-green);
}

/* ===== 按钮通用样式 ===== */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--military-green-dark), var(--military-green));
  color: var(--bg-dark);
  border: 1px solid var(--military-green);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--military-green), var(--military-green-light));
  box-shadow: 0 0 12px rgba(139,195,74,0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--military-green);
  color: var(--military-green);
}

.btn-checkin {
  padding: 6px 14px;
  background: linear-gradient(135deg, var(--military-green-dark), var(--military-green));
  color: var(--bg-dark);
  border: none;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-checkin:hover {
  box-shadow: 0 0 12px rgba(139,195,74,0.4);
  transform: translateY(-1px);
}

.btn-checkin.done {
  background: var(--tactical-gray);
  color: var(--text-muted);
  cursor: default;
}

.btn-checkin.done:hover {
  box-shadow: none;
  transform: none;
}

.btn-tts {
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(139,195,74,0.1);
  border: 1px solid var(--military-green-dark);
  border-radius: 50%;
  color: var(--military-green);
  cursor: pointer;
  transition: var(--transition);
}

.btn-tts:hover {
  background: rgba(139,195,74,0.2);
  box-shadow: 0 0 8px rgba(139,195,74,0.3);
}

.btn-tts.playing {
  animation: pulse-green 1s infinite;
}

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 4px rgba(139,195,74,0.3); }
  50% { box-shadow: 0 0 12px rgba(139,195,74,0.6); }
}

/* ===== 悬浮数据面板 ===== */
.stats-panel {
  position: fixed;
  right: 12px;
  top: calc(var(--topbar-height) + 12px);
  width: 200px;
  background: linear-gradient(180deg, #1e221e 0%, #181b18 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  transition: var(--transition);
}

.stats-panel.collapsed .stats-body {
  display: none;
}

.stats-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
}

.stats-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--military-green);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stats-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stats-body {
  padding: 10px 14px;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(58,61,58,0.5);
}

.stat-item:last-child {
  border-bottom: none;
}

.stat-item.stat-points .stat-value {
  color: var(--military-green);
  font-size: 22px;
}

.stat-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(139,195,74,0.1);
  border-radius: var(--radius-sm);
  color: var(--military-green);
}

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
}

.stats-progress {
  padding: 10px 0 4px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.progress-bar {
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--military-green-dark), var(--military-green));
  border-radius: 3px;
  transition: width 0.5s ease;
  box-shadow: 0 0 6px rgba(139,195,74,0.4);
}

.stats-bonus {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px;
  background: rgba(255,167,38,0.1);
  border: 1px solid rgba(255,167,38,0.3);
  border-radius: var(--radius-sm);
  margin-top: 8px;
  font-size: 11px;
  color: var(--accent-amber);
  animation: pulse-amber 1.5s infinite;
}

@keyframes pulse-amber {
  0%, 100% { box-shadow: 0 0 4px rgba(255,167,38,0.2); }
  50% { box-shadow: 0 0 12px rgba(255,167,38,0.5); }
}

/* ===== 积分兑换中心 ===== */
.exchange-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.exchange-tab {
  padding: 8px 16px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.exchange-tab:hover {
  color: var(--text-primary);
}

.exchange-tab.active {
  color: var(--military-green);
  border-bottom-color: var(--military-green);
}

.exchange-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.supply-card {
  background: linear-gradient(135deg, #232722 0%, #1e221e 100%);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: center;
  position: relative;
  transition: var(--transition);
  cursor: pointer;
  overflow: hidden;
}

.supply-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: 
    linear-gradient(rgba(139,195,74,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,195,74,0.03) 1px, transparent 1px);
  background-size: 10px 10px;
  pointer-events: none;
}

.supply-card:hover {
  border-color: var(--military-green);
  box-shadow: 0 0 16px rgba(139,195,74,0.2);
  transform: translateY(-2px);
}

.supply-card:hover::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--military-green);
  animation: scan-line 1.5s linear;
}

@keyframes scan-line {
  0% { opacity: 0; transform: translateY(0); }
  50% { opacity: 1; }
  100% { opacity: 0; transform: translateY(200px); }
}

.supply-card.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.supply-card.disabled:hover {
  border-color: var(--border-color);
  box-shadow: none;
  transform: none;
}

.supply-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(139,195,74,0.1);
  border: 1px solid var(--military-green-dark);
  border-radius: 50%;
  position: relative;
  z-index: 1;
}

.supply-icon svg {
  width: 28px;
  height: 28px;
  color: var(--military-green);
}

.supply-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}

.supply-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}

.supply-cost {
  font-size: 16px;
  font-weight: 800;
  color: var(--military-green);
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}

.supply-limit {
  font-size: 10px;
  color: var(--accent-amber);
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.supply-btn {
  width: 100%;
  padding: 8px;
  background: linear-gradient(135deg, var(--military-green-dark), var(--military-green));
  border: none;
  border-radius: var(--radius);
  color: var(--bg-dark);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  z-index: 1;
}

.supply-btn:hover {
  box-shadow: 0 0 12px rgba(139,195,74,0.4);
}

.supply-btn:disabled {
  background: var(--tactical-gray);
  color: var(--text-muted);
  cursor: not-allowed;
}

.supply-btn:disabled:hover {
  box-shadow: none;
}

/* ===== 积分任务清单 ===== */
.points-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}

.points-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.points-list-item .item-name {
  font-size: 13px;
  color: var(--text-secondary);
}

.points-list-item .item-points {
  font-size: 14px;
  font-weight: 800;
  color: var(--military-green);
}

.points-list-item.bonus {
  border-color: var(--accent-amber);
  background: rgba(255,167,38,0.05);
}

.points-list-item.bonus .item-points {
  color: var(--accent-amber);
}

/* ===== 兑换记录 ===== */
.exchange-log {
  max-height: 400px;
  overflow-y: auto;
}

.log-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
}

.log-item .log-info {
  display: flex;
  flex-direction: column;
}

.log-item .log-name {
  font-size: 13px;
  color: var(--text-primary);
}

.log-item .log-time {
  font-size: 11px;
  color: var(--text-muted);
}

.log-item .log-cost {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-red);
}

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-content {
  background: linear-gradient(180deg, #232722 0%, #1a1d1a 100%);
  border: 1px solid var(--military-green-dark);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 0 24px rgba(139,195,74,0.2);
  text-align: center;
}

.modal-content .modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--military-green);
  margin-bottom: 12px;
}

.modal-content .modal-body {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.modal-content .modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

/* ===== Toast通知 ===== */
.toast-container {
  position: fixed;
  top: 60px;
  right: 16px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  background: linear-gradient(135deg, #232722, #1e221e);
  border: 1px solid var(--military-green-dark);
  border-radius: var(--radius);
  color: var(--military-green);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toast-in 0.3s ease;
  max-width: 300px;
}

.toast.error {
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.toast.warning {
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.toast.success {
  border-color: var(--military-green);
  color: var(--military-green);
}

@keyframes toast-in {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast.fade-out {
  animation: toast-out 0.3s ease forwards;
}

@keyframes toast-out {
  to { transform: translateX(100%); opacity: 0; }
}

/* ===== 错题本 ===== */
.wrong-answers {
  margin-top: 16px;
  padding: 12px;
  background: rgba(229,57,53,0.05);
  border: 1px solid rgba(229,57,53,0.2);
  border-radius: var(--radius);
}

.wrong-answers-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-red);
  margin-bottom: 8px;
}

.wrong-answer-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(58,61,58,0.3);
}

.wrong-answer-item:last-child {
  border-bottom: none;
}

/* ===== 拍照/录音上传 ===== */
.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 12px;
}

.upload-area:hover {
  border-color: var(--military-green);
  background: rgba(139,195,74,0.05);
}

.upload-area .upload-icon {
  font-size: 24px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.upload-area .upload-text {
  font-size: 13px;
  color: var(--text-secondary);
}

.upload-preview {
  margin-top: 10px;
  max-width: 200px;
  max-height: 200px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

/* ===== 移动端菜单按钮 ===== */
.mobile-menu-btn {
  display: none;
  position: fixed;
  bottom: 16px;
  right: 16px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--military-green-dark), var(--military-green));
  border: none;
  border-radius: 50%;
  color: var(--bg-dark);
  cursor: pointer;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  align-items: center;
  justify-content: center;
}

/* ===== 响应式适配 ===== */
@media screen and (max-width: 768px) {
  :root {
    --nav-width: 56px;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: var(--topbar-height);
    bottom: 0;
    width: 200px;
    transform: translateX(-100%);
    z-index: 200;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav-label, .nav-points, .nav-badge, .nav-section-title {
    display: block;
  }

  .stats-panel {
    display: none;
  }

  .top-btn span {
    display: none;
  }

  .day-date {
    display: none;
  }

  .content-area {
    padding: 12px;
  }

  .char-grid {
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  }

  .math-problems {
    grid-template-columns: 1fr;
  }

  .word-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }

  .exchange-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 16px;
  }

  .poem-card .poem-notes {
    grid-template-columns: 1fr;
  }
}

@media screen and (min-width: 769px) and (max-width: 1024px) {
  :root {
    --nav-width: 160px;
  }
  
  .stats-panel {
    width: 180px;
  }
}

@media screen and (min-width: 1025px) {
  :root {
    --nav-width: 190px;
  }
}

/* 荣耀平板8 横屏优化 */
@media screen and (min-width: 1200px) {
  .content-area {
    padding: 24px;
  }
  
  .char-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }
  
  .exchange-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--tactical-gray);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--tactical-gray-light);
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-green { color: var(--military-green); }
.text-red { color: var(--accent-red); }
.text-amber { color: var(--accent-amber); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }