/* ============================================================
 *  CLASS_OS HTML Platform · Styles
 *  设计语言: playful + 像素游戏感 (Pokémon 训练师 + 超级马里奥)
 * ============================================================ */

/* ============================================================
 * CSS 变量 · 默认主题 (蓝色,登录前用)
 * ============================================================ */
:root {
  --color-primary: #6366F1;
  --color-primary-dark: #4338CA;
  --color-primary-light: #EEF2FF;
  --color-accent: #F59E0B;

  --color-bg: #FAFBFF;
  --color-surface: #FFFFFF;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-success: #10B981;
  --color-danger: #EF4444;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 10px 15px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.10), 0 20px 40px rgba(0,0,0,0.12);
  --shadow-pixel: 4px 4px 0 rgba(0,0,0,0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --font-display: 'Press Start 2P', monospace;
  --font-body: 'Noto Sans SC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', monospace;
}

/* 主题:海洋 */
body.theme-ocean {
  --color-primary: #0EA5E9;
  --color-primary-dark: #0369A1;
  --color-primary-light: #E0F2FE;
  --color-accent: #06B6D4;
  --color-bg: #F0F9FF;
}

/* 主题:森林 */
body.theme-forest {
  --color-primary: #16A34A;
  --color-primary-dark: #14532D;
  --color-primary-light: #DCFCE7;
  --color-accent: #84CC16;
  --color-bg: #F0FDF4;
}

/* 主题:城市 */
body.theme-city {
  --color-primary: #F59E0B;
  --color-primary-dark: #B45309;
  --color-primary-light: #FEF3C7;
  --color-accent: #EF4444;
  --color-bg: #FFFBEB;
}


/* ============================================================
 * Reset + 基础
 * ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.4s ease;
}

button { font-family: inherit; cursor: pointer; border: none; }
input, textarea { font-family: inherit; }
code { font-family: var(--font-mono); }


/* ============================================================
 * View 切换
 * ============================================================ */
.view {
  display: none;
  min-height: 100vh;
  width: 100%;
  animation: viewFadeIn 0.4s ease;
}
.view.active { display: flex; flex-direction: column; }

@keyframes viewFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}


/* ============================================================
 * 通用按钮
 * ============================================================ */
.btn-primary {
  background: var(--color-primary);
  color: white;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 700;
  box-shadow: var(--shadow-pixel);
  transition: transform 0.1s, box-shadow 0.1s;
}
.btn-primary:hover { transform: translate(-1px, -1px); box-shadow: 5px 5px 0 rgba(0,0,0,0.2); }
.btn-primary:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 rgba(0,0,0,0.15); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: var(--shadow-pixel); }

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  padding: 12px 24px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.15s;
}
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-icon {
  background: transparent;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  font-size: 18px;
  color: var(--color-text-muted);
  display: inline-flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.btn-icon:hover { background: var(--color-primary-light); color: var(--color-primary); }

.btn-mini {
  background: transparent;
  color: var(--color-text-muted);
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}
.btn-mini:hover { border-color: var(--color-primary); color: var(--color-primary); }


/* ============================================================
 * VIEW: 登录
 * ============================================================ */
.view-login {
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, #EEF2FF 0%, #DBEAFE 50%, #F3E8FF 100%);
}

.login-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}
.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: blobFloat 20s ease-in-out infinite;
}
.blob-1 { width: 400px; height: 400px; background: #818CF8; top: -100px; left: -100px; }
.blob-2 { width: 350px; height: 350px; background: #FBBF24; bottom: -80px; right: -80px; animation-delay: -7s; }
.blob-3 { width: 250px; height: 250px; background: #34D399; top: 50%; left: 70%; animation-delay: -14s; }

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -40px) scale(1.1); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

.login-card {
  position: relative;
  background: white;
  border-radius: var(--radius-lg);
  padding: 48px 44px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  border: 3px solid #1E293B;
  z-index: 1;
}

.login-logo { text-align: center; margin-bottom: 32px; }
.logo-pixel {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.logo-title {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 0 0 8px;
  color: var(--color-text);
  letter-spacing: 1px;
}
.logo-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 1px;
}

.login-tabs {
  display: flex;
  gap: 4px;
  background: var(--color-bg);
  padding: 4px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}
.tab-btn {
  flex: 1;
  padding: 10px;
  background: transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: all 0.2s;
}
.tab-btn.active {
  background: white;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.login-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
}
.form-group input {
  padding: 14px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 16px;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}
.form-group input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-msg {
  font-size: 13px;
  min-height: 18px;
  text-align: center;
}
.form-msg.error { color: var(--color-danger); }
.form-msg.success { color: var(--color-success); }

.login-footer {
  position: absolute;
  bottom: 24px;
  left: 0; right: 0;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
  z-index: 1;
}


/* ============================================================
 * VIEW: 主题选择
 * ============================================================ */
.view-theme {
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background: linear-gradient(180deg, #FAFBFF 0%, #EEF2FF 100%);
}
.theme-header { text-align: center; margin-bottom: 40px; }
.theme-greeting { font-size: 16px; color: var(--color-text-muted); margin-bottom: 8px; }
.theme-prompt strong { font-size: 28px; display: block; margin-bottom: 8px; }
.theme-prompt-sub { font-size: 14px; color: var(--color-text-muted); }

.theme-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(250px, 320px));
  gap: 24px;
  max-width: 1100px;
  width: 100%;
}

.theme-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: center;
  cursor: pointer;
  border: 3px solid transparent;
  transition: all 0.25s;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.theme-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 6px;
}
.theme-card-ocean::before { background: linear-gradient(90deg, #0EA5E9, #06B6D4); }
.theme-card-forest::before { background: linear-gradient(90deg, #16A34A, #84CC16); }
.theme-card-city::before { background: linear-gradient(90deg, #F59E0B, #EF4444); }

.theme-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
}
.theme-card-ocean:hover { border-color: #0EA5E9; }
.theme-card-forest:hover { border-color: #16A34A; }
.theme-card-city:hover { border-color: #F59E0B; }

.theme-card-emoji { font-size: 72px; margin-bottom: 12px; line-height: 1; }
.theme-card-name {
  font-family: var(--font-display);
  font-size: 18px;
  margin-bottom: 6px;
  letter-spacing: 1px;
}
.theme-card-sdg {
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.theme-card-story {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}
.theme-card-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}
.theme-card-cta {
  display: inline-block;
  padding: 10px 20px;
  border: 2px solid var(--color-text);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 14px;
  transition: all 0.2s;
}
.theme-card-ocean .theme-card-cta { border-color: #0EA5E9; color: #0EA5E9; }
.theme-card-forest .theme-card-cta { border-color: #16A34A; color: #16A34A; }
.theme-card-city .theme-card-cta { border-color: #F59E0B; color: #F59E0B; }

.theme-card-ocean:hover .theme-card-cta { background: #0EA5E9; color: white; }
.theme-card-forest:hover .theme-card-cta { background: #16A34A; color: white; }
.theme-card-city:hover .theme-card-cta { background: #F59E0B; color: white; }


/* ============================================================
 * VIEW: 关卡地图
 * ============================================================ */
.view-map { background: var(--color-bg); }

.map-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  background: white;
  border-bottom: 3px solid var(--color-text);
  box-shadow: var(--shadow-sm);
}
.map-header-left, .map-header-right {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}
.map-header-right { justify-content: flex-end; }
.map-header-center { flex: 2; text-align: center; }

.map-theme-badge {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
}

.map-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 1px;
}

.map-user { font-weight: 600; color: var(--color-text-muted); }

.map-progress-wrap {
  padding: 24px 32px 12px;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}
.map-progress {
  flex: 1;
  height: 16px;
  background: var(--color-border);
  border-radius: 999px;
  overflow: hidden;
  border: 2px solid var(--color-text);
}
.map-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  width: 0%;
  transition: width 0.5s ease;
  border-radius: 999px;
}
.map-progress-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.map-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 20px;
  padding: 24px 32px 60px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.level-tile {
  background: white;
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  border: 3px solid var(--color-border);
  position: relative;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.level-tile-locked {
  opacity: 0.45;
  cursor: not-allowed;
  background: var(--color-bg);
}

.level-tile-current {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-light), var(--shadow-md);
  animation: tilePulse 2s ease-in-out infinite;
}

.level-tile-passed {
  border-color: var(--color-success);
  background: linear-gradient(135deg, white 0%, #ECFDF5 100%);
}

@keyframes tilePulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--color-primary-light), var(--shadow-md); }
  50% { box-shadow: 0 0 0 8px var(--color-primary-light), var(--shadow-md); }
}

.level-tile:not(.level-tile-locked):hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.level-tile-num {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.level-tile-emoji { font-size: 42px; line-height: 1; margin: 8px 0; }
.level-tile-title { font-weight: 700; font-size: 15px; margin-bottom: 6px; }
.level-tile-learning {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 8px;
  border-radius: 6px;
  display: inline-block;
}
.level-tile-score {
  position: absolute;
  top: 10px; right: 10px;
  background: var(--color-success);
  color: white;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 999px;
}
.level-tile-locked-icon {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 32px;
  opacity: 0.6;
}


/* ============================================================
 * VIEW: 关卡游玩
 * ============================================================ */
.view-play { background: var(--color-bg); }

.play-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: white;
  border-bottom: 3px solid var(--color-text);
  box-shadow: var(--shadow-sm);
}
.play-level-info { flex: 1; }
.play-level-num {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--color-primary);
  letter-spacing: 1px;
}
.play-level-title { font-size: 18px; font-weight: 700; }
.play-stats { display: flex; gap: 16px; }
.stat-item {
  background: var(--color-bg);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.stat-emoji { font-size: 16px; }

.play-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 320px 1fr 1fr;
  gap: 16px;
  padding: 16px 20px;
  min-height: 0;
}

.play-task, .play-editor, .play-preview {
  background: white;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.task-card { padding: 24px; flex: 1; overflow-y: auto; }
.task-emoji { font-size: 56px; line-height: 1; margin-bottom: 12px; }
.task-learning {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}
.task-learning code {
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 4px;
}
.task-content {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 20px;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.task-content code {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 14px;
}
.task-content strong { font-weight: 700; color: var(--color-text); }
.task-content pre {
  background: #1E293B;
  color: #E2E8F0;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  overflow-x: auto;
}

.btn-hint { width: 100%; margin-top: 8px; }

.hint-box {
  margin-top: 12px;
  padding: 14px 16px;
  background: #FFFBEB;
  border: 2px solid #FDE68A;
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.6;
  display: none;
}
.hint-box.visible { display: block; animation: hintFadeIn 0.3s ease; }
.hint-box code {
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
.hint-box pre {
  background: #1E293B;
  color: #E2E8F0;
  padding: 10px;
  border-radius: 6px;
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  overflow-x: auto;
}

@keyframes hintFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.editor-header, .preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
  font-weight: 600;
}
.editor-mount { flex: 1; overflow: hidden; }
.editor-mount .cm-editor {
  height: 100%;
  font-family: var(--font-mono);
}
.editor-mount .cm-scroller { font-size: 14px; line-height: 1.6; }

.preview-frame {
  flex: 1;
  width: 100%;
  border: none;
  background: white;
}

.play-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: white;
  border-top: 2px solid var(--color-border);
}
.play-footer-spacer { flex: 1; }

.btn-ai {
  background: linear-gradient(135deg, #8B5CF6, #6366F1);
  color: white;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 15px;
  box-shadow: var(--shadow-pixel);
  transition: transform 0.1s, box-shadow 0.1s;
}
.btn-ai:hover { transform: translate(-1px, -1px); box-shadow: 5px 5px 0 rgba(99, 102, 241, 0.4); }
.btn-ai:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 rgba(99, 102, 241, 0.3); }

.btn-check { padding: 14px 32px; font-size: 16px; }


/* ============================================================
 * 模态框
 * ============================================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal.active { display: flex; animation: modalFadeIn 0.2s ease; }
@keyframes modalFadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.3s ease;
  border: 3px solid var(--color-text);
}
@keyframes modalSlideIn {
  from { opacity: 0; transform: scale(0.95) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* 检查结果模态框 */
.result-card { text-align: center; }
.result-score-num {
  font-family: var(--font-display);
  font-size: 48px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.result-score-suffix { font-size: 20px; color: var(--color-text-muted); }
.result-score-label {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
}
.result-pass .result-score-num { color: var(--color-success); }
.result-fail .result-score-num { color: var(--color-danger); }

.result-criteria {
  text-align: left;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
}
.result-criteria-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
}
.result-criteria-item .icon { font-size: 18px; flex-shrink: 0; }
.result-criteria-item.pass { color: var(--color-success); }
.result-criteria-item.fail { color: var(--color-danger); }
.result-criteria-item .points {
  margin-left: auto;
  font-weight: 700;
  font-size: 13px;
  color: var(--color-text-muted);
}

.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.result-actions button { flex: 1; }


/* AI 教练模态框 */
.ai-card {
  display: flex;
  flex-direction: column;
  height: 600px;
  max-width: 600px;
  padding: 0;
}
.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 2px solid var(--color-border);
  background: linear-gradient(135deg, #8B5CF6 0%, #6366F1 100%);
  color: white;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.ai-title { font-size: 18px; font-weight: 700; }
.ai-header .btn-icon { color: white; }
.ai-header .btn-icon:hover { background: rgba(255,255,255,0.2); }

.ai-quota {
  padding: 10px 20px;
  background: var(--color-primary-light);
  font-size: 13px;
  text-align: center;
  font-weight: 600;
}

.ai-conversation {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ai-message {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.6;
  max-width: 85%;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.ai-message code {
  background: rgba(0,0,0,0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
}
.ai-message pre {
  background: rgba(0,0,0,0.08);
  padding: 8px;
  border-radius: 6px;
  margin: 6px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  overflow-x: auto;
}
.ai-message-user {
  background: var(--color-primary);
  color: white;
  align-self: flex-end;
}
.ai-message-user code, .ai-message-user pre {
  background: rgba(255,255,255,0.2);
  color: white;
}
.ai-message-bot {
  background: var(--color-bg);
  color: var(--color-text);
  align-self: flex-start;
}
.ai-message-loading { font-style: italic; color: var(--color-text-muted); }

.ai-input-row {
  display: flex;
  gap: 8px;
  padding: 16px 20px;
  border-top: 2px solid var(--color-border);
}
.ai-input-row textarea {
  flex: 1;
  padding: 12px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  resize: none;
  height: 60px;
  outline: none;
}
.ai-input-row textarea:focus {
  border-color: var(--color-primary);
}
.ai-input-row button { align-self: stretch; }


/* 庆祝模态框 */
.celebrate-card { text-align: center; padding: 40px 32px; }
.celebrate-confetti {
  font-size: 80px;
  animation: confettiBounce 0.6s ease;
}
@keyframes confettiBounce {
  0% { transform: scale(0) rotate(-180deg); }
  60% { transform: scale(1.2) rotate(20deg); }
  100% { transform: scale(1) rotate(0); }
}
.celebrate-title {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 16px 0 12px;
  letter-spacing: 1px;
}
.celebrate-score {
  font-size: 48px;
  font-weight: 900;
  color: var(--color-success);
  margin-bottom: 12px;
}
.celebrate-msg {
  font-size: 16px;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}
.celebrate-actions { display: flex; gap: 12px; }
.celebrate-actions button { flex: 1; }

/* 确认模态框 */
.confirm-card { text-align: center; padding: 32px; max-width: 400px; }
.confirm-msg { font-size: 16px; margin-bottom: 24px; line-height: 1.6; }
.confirm-actions { display: flex; gap: 12px; }
.confirm-actions button { flex: 1; }


/* ============================================================
 * Toast
 * ============================================================ */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-120%);
  background: var(--color-text);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: transform 0.3s ease;
  max-width: 90vw;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--color-danger); }
.toast.success { background: var(--color-success); }


/* ============================================================
 * 响应式 (大致只支持中等以上屏幕,因为学校电脑足够大)
 * ============================================================ */
@media (max-width: 1024px) {
  .play-layout {
    grid-template-columns: 280px 1fr;
    grid-template-rows: 1fr 280px;
  }
  .play-task { grid-row: 1 / 3; }
  .play-editor { grid-column: 2; grid-row: 1; }
  .play-preview { grid-column: 2; grid-row: 2; }
}

@media (max-width: 768px) {
  .theme-cards { grid-template-columns: 1fr; }
  .play-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 300px 200px;
  }
  .play-task, .play-editor, .play-preview { grid-row: auto; grid-column: auto; }
  .map-header { flex-direction: column; gap: 8px; padding: 12px 16px; }
  .map-header-center .map-title { font-size: 14px; }
}

.code-editor {
  flex: 1;
  width: 100%;
  border: none;
  outline: none;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  resize: none;
  background: white;
  color: var(--color-text);
  tab-size: 2;
  white-space: pre;
  overflow: auto;
}

.code-editor:focus {
  background: #FAFBFF;
}