/**
 * utrough.css
 * 现代化物理过程图仿真系统样式表
 * 支持明/暗主题无缝切换、响应式网格布局、高对比度与移动端适配
 */

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(51, 65, 85, 0.8);
  --border-color: rgba(148, 163, 184, 0.2);
  --border-active: #38bdf8;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-accent: #38bdf8;

  --p-color: #ef4444;       /* 物块P: 红色 */
  --q-color: #06b6d4;       /* 凹槽Q: 青色 */
  --cm-color: #f59e0b;      /* 质心: 金黄 */
  --success-color: #10b981; /* 成功/静止: 翡翠绿 */
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Fira Code", monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.15), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  --radius-md: 10px;
  --radius-lg: 16px;
}

body.theme-light {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(241, 245, 249, 0.95);
  --border-color: rgba(100, 116, 139, 0.2);
  --border-active: #0284c7;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-accent: #0284c7;
  --cm-color: #d97706;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
}

.container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航条 */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.header-badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.15);
  color: var(--text-accent);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.header-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.header-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-pill {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-pill:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-accent);
  color: var(--text-accent);
}

/* 主内容布局 */
.main-layout {
  padding-top: 24px;
  padding-bottom: 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* 控制模式切换大卡片 */
.control-hub-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 24px;
  box-shadow: var(--shadow-md);
}

.mode-selector-tabs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.mode-tab-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 9px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.mode-tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-card-hover);
}

.mode-tab-btn.active {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
  box-shadow: 0 0 12px rgba(2, 132, 199, 0.4);
}

/* 全过程连续控制区 */
.continuous-controls-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.playback-btns-group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-primary {
  background: #0284c7;
  color: #ffffff;
  border: none;
  padding: 9px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
  background: #0369a1;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 9px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-accent);
}

.timeline-scrubber-box {
  flex: 1;
  min-width: 260px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.timeline-slider {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: #334155;
  outline: none;
  cursor: pointer;
  accent-color: #38bdf8;
}

.time-display-badge {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-accent);
  background: var(--bg-card);
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  min-width: 90px;
  text-align: center;
}

.speed-control-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.speed-label {
  font-size: 12px;
  color: var(--text-muted);
}

.speed-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 9px;
  border-radius: 6px;
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.speed-btn:hover {
  color: var(--text-main);
  border-color: var(--text-accent);
}

.speed-btn.active {
  background: #38bdf8;
  color: #0f172a;
  border-color: #38bdf8;
  font-weight: 700;
}

/* 分段解析控制区 */
.segmented-controls-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.stage-pills-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.stage-pill-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.stage-pill-btn:hover {
  border-color: var(--text-accent);
  color: var(--text-main);
}

.stage-pill-btn.active {
  background: #f59e0b;
  border-color: #fbbf24;
  color: #0f172a;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
}

.stage-nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.stage-focus-card {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  margin-top: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.stage-focus-title {
  font-size: 14px;
  font-weight: 700;
  color: #fbbf24;
}

.stage-focus-desc {
  font-size: 13px;
  color: var(--text-muted);
}

.stage-focus-tags {
  display: flex;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.tag-badge {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 3px 8px;
  border-radius: 4px;
}

/* 主仿真视窗卡片 */
.simulation-viewport-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.viewport-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 18px;
  background: rgba(15, 23, 42, 0.5);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 10px;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.view-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.view-btn:hover {
  color: var(--text-main);
  border-color: var(--text-accent);
}

.view-btn.active {
  background: #38bdf8;
  color: #0f172a;
  border-color: #38bdf8;
}

.toggle-label {
  font-size: 12px;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.canvas-container {
  width: 100%;
  height: 380px;
  position: relative;
  background: #0f172a;
}

#simCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* 实时力学参量仪表盘 (8格) */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
  gap: 12px;
}

.metric-tile {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s;
}

.metric-tile:hover {
  border-color: var(--border-active);
}

.metric-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.metric-unit {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 2px;
}

/* 能量守恒条 */
.energy-bar-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.energy-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

.energy-progress-track {
  width: 100%;
  height: 14px;
  background: #334155;
  border-radius: 7px;
  display: flex;
  overflow: hidden;
}

.energy-seg-p {
  background: #ef4444;
  height: 100%;
  transition: width 0.05s linear;
}

.energy-seg-q {
  background: #06b6d4;
  height: 100%;
  transition: width 0.05s linear;
}

.energy-seg-heat {
  background: #f59e0b;
  height: 100%;
  transition: width 0.05s linear;
}

/* 图表区域网格 */
.graphs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .graphs-grid {
    grid-template-columns: 1fr;
  }
}

.graph-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.graph-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.graph-title {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.graph-canvas-box {
  width: 100%;
  height: 260px;
  position: relative;
}

.graph-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* 13 阶段对照总表 */
.matrix-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-md);
}

.table-responsive {
  overflow-x: auto;
  margin-top: 14px;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

.matrix-table th {
  background: rgba(15, 23, 42, 0.6);
  padding: 10px 12px;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.matrix-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.matrix-table tr {
  cursor: pointer;
  transition: background-color 0.15s;
}

.matrix-table tr:hover {
  background-color: var(--bg-card-hover);
}

.matrix-table tr.active-row {
  background-color: rgba(56, 189, 248, 0.15);
  border-left: 3px solid var(--text-accent);
}

/* 题目卡片与数学解析 */
.problem-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.problem-content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 16px;
}

@media (max-width: 860px) {
  .problem-content-grid {
    grid-template-columns: 1fr;
  }
}

.problem-img-box {
  background: #000000;
  border-radius: var(--radius-md);
  padding: 12px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.problem-img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.problem-text-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.7;
}

.question-callout {
  background: var(--bg-card);
  border-left: 4px solid #38bdf8;
  padding: 12px 16px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: 8px;
}

.solution-accordion {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.solution-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
}

.solution-panel h4 {
  font-size: 1.05rem;
  color: #38bdf8;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.math-formula {
  background: rgba(15, 23, 42, 0.6);
  padding: 8px 14px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  margin: 8px 0;
  display: block;
  overflow-x: auto;
}

/* 参数沙盒卡片 */
.sandbox-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.sandbox-sliders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.slider-group label {
  font-size: 13px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
}

/* 测验卡片 */
.quiz-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.quiz-question-box {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

@media (max-width: 600px) {
  .quiz-options {
    grid-template-columns: 1fr;
  }
}

.quiz-opt-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
}

.quiz-opt-btn:hover {
  border-color: var(--text-accent);
  background: var(--bg-card-hover);
}

.quiz-opt-btn.correct {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #10b981;
}

.quiz-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #ef4444;
}

/* 页脚 */
.app-footer {
  text-align: center;
  padding: 30px 0;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border-color);
}

.kbd-badge {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
}