/*
=============================================================================
使用方式說明（Usage Instructions）：
1. 本樣式表為原生效能優化 CSS，使用 CSS 自訂屬性（Custom Properties）統一調度調色盤。
2. 完整復刻原圖之「暖白底、圓角卡片、細緻邊框、特定模組主題色與多層級陰影」。
3. 支援深度的響應式佈局：桌機模式完美對齊三欄原圖空間架構；平板與手機以直覺垂直流自動重組。
4. 預設包含首屏輕微交錯進場動畫（Stagger Animation），並嚴格遵守 prefers-reduced-motion。
=============================================================================
*/

:root {
  /* 基礎版面色彩系統 */
  --bg-page: #faf8f5;
  --bg-card: #ffffff;
  --text-primary: #18181b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  /* 品牌與標題色彩 */
  --title-red: #dc4545;
  --title-black: #111827;

  /* 模組專屬色彩 tokens（依據原圖精準配對） */
  /* User Goal (淺綠) */
  --goal-bg: #eafaf1;
  --goal-border: #86efac;
  --goal-text: #166534;
  --goal-badge: #dcfce7;

  /* Planner (淺藍) */
  --planner-bg: #eef6ff;
  --planner-border: #93c5fd;
  --planner-text: #1d4ed8;

  /* Reasoning (淺黃) */
  --reasoning-bg: #fffdeb;
  --reasoning-border: #fde047;
  --reasoning-text: #854d0e;

  /* Core Loop 核心循環 */
  --loop-box-bg: #ffffff;
  --loop-dashed-border: #cbd5e1;
  --loop-pill-peach-bg: #fed7aa;
  --loop-pill-peach-border: #fdba74;
  --loop-pill-peach-text: #7c2d12;
  --loop-pill-blue-bg: #e0f2fe;
  --loop-pill-blue-border: #bae6fd;
  --loop-pill-blue-text: #0369a1;

  /* Memory (灰紫 / 丁香紫) */
  --memory-bg: #f5f3ff;
  --memory-border: #c4b5fd;
  --memory-text: #5b21b6;
  --memory-sub-bg: #ffffff;
  --memory-sub-border: #ddd6fe;

  /* Tool (金橘 / 暖黃) */
  --tool-bg: #fffbeb;
  --tool-border: #fcd34d;
  --tool-text: #92400e;
  --tool-item-bg: #ffffff;
  --tool-item-border: #fde68a;
  --tool-active-bg: #e0f2fe;
  --tool-active-border: #38bdf8;
  --tool-active-text: #0369a1;

  /* MCP (紫色) */
  --mcp-bg: #faf5ff;
  --mcp-border: #d8b4fe;
  --mcp-text: #6b21a8;
  --mcp-item-bg: #ffffff;
  --mcp-item-border: #e9d5ff;

  /* Reflection (珊瑚粉紅) */
  --reflection-bg: #ffe4e6;
  --reflection-border: #fb7185;
  --reflection-text: #9f1239;
  --reflection-glow: rgba(244, 63, 94, 0.35);

  /* Function Execution (淡藍) */
  --func-bg: #e0f2fe;
  --func-border: #7dd3fc;
  --func-text: #0369a1;

  /* Output Cards */
  --final-ans-bg: #f0fdf4;
  --final-ans-border: #86efac;
  --final-task-bg: #ecfeff;
  --final-task-border: #67e8f9;

  /* Interaction Cards */
  --inter-wrap-bg: #ffffff;
  --inter-wrap-border: #cbd5e1;
  --inter-card-bg: #fef3c7;
  --inter-card-border: #fde68a;
  --inter-nl-bg: #f1f5f9;
  --inter-nl-border: #cbd5e1;

  /* 動態高亮與脈衝流 */
  --pulse-active-color: #ef4444;
  --pulse-line-stroke: #ef4444;
  --pulse-line-width: 3px;
  --connector-default: #cbd5e1;

  /* 陰影與圓角 */
  --radius-card: 16px;
  --radius-subcard: 10px;
  --radius-pill: 8px;
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-active: 0 0 0 3px rgba(239, 68, 68, 0.25), 0 8px 20px rgba(239, 68, 68, 0.15);
}

/* 全域基礎排版與重設 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background-color: var(--bg-page);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 24px 16px 48px;
  overflow-x: hidden;
}

/* 頂層頁面容器 */
.page-wrapper {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

/* ==========================================================================
   頂端標題區塊
   ========================================================================== */
.main-header {
  text-align: center;
  margin-bottom: 20px;
  user-select: none;
}

.main-title {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 12px;
  margin-bottom: 6px;
}

.title-en {
  font-family: "Georgia", "Cambria", "Times New Roman", "Songti SC", serif;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 500;
  color: var(--title-red);
  letter-spacing: -0.5px;
}

.title-zh {
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  font-weight: 800;
  color: var(--title-black);
  letter-spacing: 1px;
}

.title-dash {
  width: 32px;
  height: 4.5px;
  background-color: #1e242b;
  margin: 0 auto;
  border-radius: 2px;
}

/* ==========================================================================
   控制台與繁體中文動態導讀列
   ========================================================================== */
.control-panel {
  width: 100%;
  max-width: 960px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.controller-bar {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  box-shadow: var(--shadow-subtle);
}

.control-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.ctrl-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: #334155;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.ctrl-btn:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  color: #0f172a;
}

.ctrl-btn:focus-visible {
  outline: 2px solid var(--pulse-active-color);
  outline-offset: 2px;
}

.ctrl-btn.primary {
  background: #dc2626;
  border-color: #b91c1c;
  color: #ffffff;
}

.ctrl-btn.primary:hover {
  background: #b91c1c;
}

.ctrl-btn.subtle {
  background: transparent;
  border-color: transparent;
  color: #64748b;
}

.ctrl-btn.subtle:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #334155;
}

.speed-toggle {
  display: flex;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  overflow: hidden;
  margin-left: 4px;
}

.speed-btn {
  background: #ffffff;
  border: none;
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748b;
  cursor: pointer;
  transition: all 0.15s ease;
}

.speed-btn:hover {
  background: #f1f5f9;
}

.speed-btn.active {
  background: #334155;
  color: #ffffff;
}

.step-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
}

.step-badge {
  background: #f1f5f9;
  color: #0f172a;
  border: 1px solid #cbd5e1;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  transition: all 0.25s ease;
}

.step-badge.highlight {
  background: #fee2e2;
  border-color: #fca5a5;
  color: #991b1b;
}

.keyboard-tip {
  font-size: 0.78rem;
  color: #94a3b8;
}

/* 狀態說明橫幅 */
.status-explanation-card {
  background: linear-gradient(135deg, #ffffff 0%, #fffcf8 100%);
  border: 1px solid #fed7aa;
  border-left: 5px solid #ea580c;
  border-radius: 12px;
  padding: 12px 18px;
  box-shadow: var(--shadow-subtle);
  transition: all 0.25s ease;
}

.status-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.pulse-indicator-dot {
  width: 10px;
  height: 10px;
  background-color: #ea580c;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(234, 88, 12, 0.7);
  animation: ripplePulse 1.8s infinite;
}

@keyframes ripplePulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(234, 88, 12, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 8px rgba(234, 88, 12, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(234, 88, 12, 0); }
}

.status-title {
  font-size: 0.96rem;
  font-weight: 700;
  color: #9a3412;
}

.status-detail {
  font-size: 0.88rem;
  line-height: 1.55;
  color: #475569;
}

/* ==========================================================================
   畫布容器與 SVG 連線層
   ========================================================================== */
.diagram-canvas {
  width: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* SVG 連線層覆蓋在所有卡片下方 */
.connections-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.flow-path {
  fill: none;
  stroke: var(--connector-default);
  stroke-width: 2px;
  transition: stroke 0.3s ease, stroke-width 0.3s ease;
}

.flow-path.active {
  stroke: var(--pulse-line-stroke);
  stroke-width: var(--pulse-line-width);
  stroke-dasharray: 6 4;
  animation: pathDashFlow 1s linear infinite;
}

@keyframes pathDashFlow {
  to { stroke-dashoffset: -20; }
}

.path-label-rect {
  fill: #ffffff;
  stroke: #cbd5e1;
  stroke-width: 1;
  rx: 4;
}

.path-label-text {
  font-size: 11px;
  fill: #475569;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
}

/* ==========================================================================
   卡片共用設計系統
   ========================================================================== */
.card {
  position: relative;
  z-index: 2;
  border-radius: var(--radius-card);
  border: 1.5px solid transparent;
  box-shadow: var(--shadow-subtle);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  user-select: none;
  cursor: pointer;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.card:focus-visible {
  outline: none;
  box-shadow: var(--shadow-active);
}

/* 活躍步驟高亮 */
.card.is-active-step {
  box-shadow: var(--shadow-active);
  transform: translateY(-2px);
  animation: activeCardPulse 2s infinite ease-in-out;
}

@keyframes activeCardPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.4), 0 8px 24px rgba(239, 68, 68, 0.2); }
  50% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0.15), 0 12px 28px rgba(239, 68, 68, 0.25); }
}

/* ==========================================================================
   模組 0：用戶目標 (User Goal)
   ========================================================================== */
.goal-section {
  width: 100%;
  max-width: 580px;
  margin-top: 4px;
  display: flex;
  justify-content: center;
}

.card-goal {
  width: 100%;
  background-color: var(--goal-bg);
  border-color: var(--goal-border);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.goal-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: #bfdbfe;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.goal-content {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.card-goal .card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1e293b;
}

.goal-example {
  font-size: 0.88rem;
  color: #475569;
}

/* ==========================================================================
   三欄主要架構網格
   ========================================================================== */
.architecture-grid {
  width: 100%;
  display: grid;
  grid-template-columns: 240px 1fr 370px;
  gap: 28px;
  align-items: start;
}

/* --------------------------------------------------------------------------
   左欄：3. Memory (記憶)
   -------------------------------------------------------------------------- */
.col-memory {
  display: flex;
  flex-direction: column;
}

.card-memory {
  background-color: var(--memory-bg);
  border-color: var(--memory-border);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.memory-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.card-header-main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.card-memory .card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--memory-text);
}

.card-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.memory-subcards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.memory-sub {
  background-color: var(--memory-sub-bg);
  border: 1px solid var(--memory-sub-border);
  border-radius: var(--radius-subcard);
  padding: 10px 12px;
  text-align: center;
  transition: all 0.2s ease;
}

.memory-sub:hover {
  border-color: #a78bfa;
  box-shadow: 0 2px 6px rgba(124, 58, 237, 0.08);
}

.memory-sub .sub-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: #1e1b4b;
  margin-bottom: 2px;
}

.memory-sub .sub-desc {
  font-size: 0.78rem;
  color: #64748b;
  line-height: 1.35;
}

.module-role-note {
  font-size: 0.75rem;
  color: #7c3aed;
  background-color: #ede9fe;
  padding: 8px 10px;
  border-radius: 6px;
  line-height: 1.4;
  text-align: center;
  border: 1px dashed #c4b5fd;
}

/* --------------------------------------------------------------------------
   中欄：核心認知決策流水線
   -------------------------------------------------------------------------- */
.col-center {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* 1. Planner 區塊 (包含右側步驟浮動卡) */
.planner-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.card-planner {
  flex: 1;
  background-color: var(--planner-bg);
  border-color: var(--planner-border);
  padding: 14px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.card-planner .card-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--planner-text);
}

.emoji-icon {
  font-size: 1.25rem;
}

/* Planner 拆解步驟小卡片 */
.planner-steps-card {
  position: absolute;
  right: -130px;
  top: 50%;
  transform: translateY(-50%);
  background: #fefce8;
  border: 1px solid #fde047;
  border-radius: 10px;
  padding: 8px 12px;
  box-shadow: var(--shadow-subtle);
  z-index: 3;
  width: 120px;
}

.step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.step-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  padding: 1px 0;
  border-bottom: 1px dotted #fef08a;
}

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

.step-num {
  font-weight: 700;
  color: #2563eb;
}

.step-text {
  color: #334155;
  font-weight: 500;
}

/* 2. Reasoning 區塊 */
.card-reasoning {
  background-color: var(--reasoning-bg);
  border-color: var(--reasoning-border);
  padding: 14px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.card-reasoning .card-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--reasoning-text);
}

/* Agent 核心循環 */
.card-core-loop {
  background-color: var(--loop-box-bg);
  border: 1.5px dashed var(--loop-dashed-border);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.core-loop-header {
  text-align: center;
}

.core-loop-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #0f172a;
  letter-spacing: 0.5px;
}

.loop-body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.loop-rows {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.loop-row {
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.loop-row:hover {
  transform: translateX(2px);
}

.pill-tag {
  background-color: var(--loop-pill-peach-bg);
  border: 1px solid var(--loop-pill-peach-border);
  color: var(--loop-pill-peach-text);
  border-radius: var(--radius-pill);
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 90px;
  text-align: center;
}

.tag-en {
  font-size: 0.78rem;
  font-weight: 700;
}

.tag-zh {
  font-size: 0.72rem;
  color: #9a3412;
}

.pill-desc {
  flex: 1;
  background-color: var(--loop-pill-blue-bg);
  border: 1px solid var(--loop-pill-blue-border);
  color: var(--loop-pill-blue-text);
  border-radius: var(--radius-pill);
  padding: 8px 12px;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.35;
}

.loop-iteration-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0 4px;
}

.iteration-text {
  font-size: 0.75rem;
  font-weight: 700;
  color: #475569;
  writing-mode: vertical-rl;
  letter-spacing: 2px;
}

/* 6. Reflection (反思) */
.card-reflection {
  background-color: var(--reflection-bg);
  border-color: var(--reflection-border);
  padding: 14px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  box-shadow: 0 0 12px var(--reflection-glow);
}

.card-reflection .card-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--reflection-text);
}

.card-reflection .card-subtitle {
  color: #b91c1c;
}

/* --------------------------------------------------------------------------
   右欄：4. Tool (工具) & 5. MCP
   -------------------------------------------------------------------------- */
.col-tools {
  display: flex;
  flex-direction: column;
  margin-top: 118px; /* 桌機寬度（>880px）往下移至 Planner 步驟清單下方，避免遮擋 Tool/MCP 標題 */
}

.tools-side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* 4. Tool (工具) */
.card-tool {
  background-color: var(--tool-bg);
  border-color: var(--tool-border);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tool-header {
  text-align: center;
}

.card-tool .card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--tool-text);
}

.tool-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tool-item {
  background-color: var(--tool-item-bg);
  border: 1px solid var(--tool-item-border);
  border-radius: 8px;
  padding: 6px 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #334155;
  transition: all 0.18s ease;
}

.tool-item:hover {
  border-color: #f59e0b;
  background-color: #fffbeb;
}

.active-tool-highlight {
  background-color: var(--tool-active-bg);
  border-color: var(--tool-active-border);
  color: var(--tool-active-text);
  font-weight: 700;
}

.tool-more {
  justify-content: center;
  color: #94a3b8;
  border-style: dashed;
}

/* 5. MCP (模型上下文協定) */
.card-mcp {
  background-color: var(--mcp-bg);
  border-color: var(--mcp-border);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mcp-header {
  text-align: center;
}

.card-mcp .card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--mcp-text);
}

.card-mcp .card-subtitle {
  font-size: 0.72rem;
  line-height: 1.25;
}

.mcp-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mcp-item {
  background-color: var(--mcp-item-bg);
  border: 1px solid var(--mcp-item-border);
  border-radius: 8px;
  padding: 6px 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #334155;
  transition: all 0.18s ease;
}

.mcp-item:hover {
  border-color: #a855f7;
  background-color: #faf5ff;
}

.mcp-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
}

.brand-g { color: #2563eb; }
.brand-notion { font-family: serif; font-weight: 800; }
.brand-slack { font-weight: 900; color: #a21caf; }

.mcp-more {
  justify-content: center;
  color: #94a3b8;
  border-style: dashed;
}

/* ==========================================================================
   下方：Function 執行結果與最終輸出流水線
   ========================================================================== */
.bottom-execution-section {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
}

.function-result-wrapper {
  width: 100%;
}

.card-function {
  width: 100%;
  background-color: var(--func-bg);
  border-color: var(--func-border);
  padding: 12px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.card-function .card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--func-text);
}

.card-function .card-subtitle {
  color: #0284c7;
}

/* 分隔標籤：生成輸出 */
.section-divider-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #475569;
  padding: 2px 0;
}

/* 最終產物雙卡片 */
.output-cards-row {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.card-output {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.card-final-answer {
  background-color: var(--final-ans-bg);
  border-color: var(--final-ans-border);
}

.card-task-result {
  background-color: var(--final-task-bg);
  border-color: var(--final-task-border);
}

.output-icon-box {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.checkmark-box { background-color: #dcfce7; }
.doc-box { background-color: #e0f2fe; }

.output-text-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.card-output .card-title {
  font-size: 0.94rem;
  font-weight: 700;
  color: #0f172a;
}

.down-arrow-connector {
  display: flex;
  justify-content: center;
  margin: -4px 0;
}

/* 交互展示卡片 */
.card-interaction {
  width: 100%;
  background-color: var(--inter-wrap-bg);
  border-color: var(--inter-wrap-border);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.interaction-header {
  text-align: center;
}

.card-interaction .card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0f172a;
}

.interaction-types-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: center;
}

.interaction-box {
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.2s ease;
}

.smart-card {
  background-color: var(--inter-card-bg);
  border: 1px solid var(--inter-card-border);
}

.natural-language {
  background-color: var(--inter-nl-bg);
  border: 1px solid var(--inter-nl-border);
}

.interaction-box:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-subtle);
}

.inter-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 2px;
}

.inter-sub {
  font-size: 0.74rem;
  color: #64748b;
}

.or-separator {
  font-size: 0.85rem;
  font-weight: 700;
  color: #94a3b8;
  font-style: italic;
  padding: 0 4px;
}

/* ==========================================================================
   底部總結與深度圖例
   ========================================================================== */
.diagram-footer {
  width: 100%;
  max-width: 960px;
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card-summary {
  width: 100%;
  background-color: #ffffff;
  border: 1.5px dashed #cbd5e1;
  border-radius: var(--radius-card);
  padding: 16px 20px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  box-shadow: var(--shadow-subtle);
}

.summary-icon-wrap {
  flex-shrink: 0;
  font-size: 1.4rem;
}

.summary-content {
  font-size: 0.92rem;
  line-height: 1.65;
  color: #334155;
}

.summary-badge {
  font-weight: 800;
  color: #b45309;
  margin-right: 4px;
}

.summary-body strong {
  color: #0f172a;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 繁體中文深度對照圖例 */
.legend-deep-dive {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 16px 20px;
  box-shadow: var(--shadow-subtle);
}

.legend-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #1e293b;
  margin-bottom: 12px;
}

.legend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 10px;
}

.legend-item {
  font-size: 0.82rem;
  line-height: 1.5;
  color: #475569;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.goal-dot { background-color: #22c55e; }
.planner-dot { background-color: #3b82f6; }
.reasoning-dot { background-color: #eab308; }
.memory-dot { background-color: #8b5cf6; }
.tool-dot { background-color: #f97316; }
.reflection-dot { background-color: #f43f5e; }

/* 底部來源致敬標示 */
.attribution-line {
  text-align: center;
  font-size: 0.8rem;
  color: #94a3b8;
  padding-bottom: 8px;
}

/* ==========================================================================
   進場動態效果 (Stagger Entry Animations)
   ========================================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.main-header { animation: fadeInUp 0.5s ease backwards; }
.control-panel { animation: fadeInUp 0.5s 0.08s ease backwards; }
.goal-section { animation: fadeInUp 0.5s 0.16s ease backwards; }
.col-memory { animation: fadeInUp 0.5s 0.24s ease backwards; }
.col-center { animation: fadeInUp 0.5s 0.28s ease backwards; }
.col-tools { animation: fadeInUp 0.5s 0.32s ease backwards; }
.bottom-execution-section { animation: fadeInUp 0.5s 0.4s ease backwards; }
.diagram-footer { animation: fadeInUp 0.5s 0.48s ease backwards; }

/* ==========================================================================
   響應式設計（Responsive Breakpoints）
   ========================================================================== */
/* 中型螢幕與平板 */
@media (max-width: 1040px) {
  .architecture-grid {
    grid-template-columns: 210px 1fr 300px;
    gap: 16px;
  }

  .planner-steps-card {
    right: -100px;
    width: 100px;
    padding: 6px 8px;
  }

  .tools-side-by-side {
    gap: 8px;
  }
}

/* 小型平板與直立式平板 */
@media (max-width: 880px) {
  .diagram-canvas {
    padding: 0 16px;
    box-sizing: border-box;
  }

  .architecture-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
  }

  /* 採用 display: contents 讓子卡片直接作為 flex 項目依序重排 */
  .col-memory,
  .col-center,
  .col-tools {
    display: contents;
  }

  /* <=880px 依序清晰呈現：User Goal → Memory → Planner/步驟 → Reasoning → 核心循環 → Tool與MCP → Reflection */
  .card-memory {
    order: 1;
    width: 100%;
  }

  .planner-wrapper {
    order: 2;
    width: 100%;
    flex-direction: column;
  }

  .planner-steps-card {
    position: static;
    transform: none;
    width: 100%;
    margin-top: 8px;
  }

  .card-reasoning {
    order: 3;
    width: 100%;
  }

  .card-core-loop {
    order: 4;
    width: 100%;
  }

  .tools-side-by-side {
    order: 5;
    width: 100%;
    grid-template-columns: 1fr 1fr;
    margin-top: 0;
  }

  .card-tool,
  .card-mcp {
    width: 100%;
  }

  .card-reflection {
    order: 6;
    width: 100%;
  }

  .bottom-execution-section {
    width: 100%;
    max-width: 100%;
  }
}

/* 手機版直式排版 */
@media (max-width: 600px) {
  body {
    padding: 16px 8px 32px;
  }

  .diagram-canvas {
    padding: 0 12px;
  }

  .controller-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .control-buttons {
    justify-content: center;
  }

  .step-indicator {
    justify-content: center;
    flex-direction: column;
    gap: 6px;
  }

  .tools-side-by-side {
    grid-template-columns: 1fr;
  }

  .output-cards-row {
    grid-template-columns: 1fr;
  }

  .interaction-types-row {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .interaction-box {
    justify-content: center;
  }

  .or-separator {
    margin: 4px 0;
  }

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

/* ==========================================================================
   無障礙與減少動畫模式 (Prefers-Reduced-Motion)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .pulse-indicator-dot {
    animation: none;
  }

  .flow-path.active {
    animation: none;
  }

  #pulse-ball {
    display: none !important;
  }
}