/* ──────────────────────────────────────────────
   東方設計哲學規範 · 約束求解器 · 站點樣式
   基於 colors_and_type.css 的 token 體系
   ────────────────────────────────────────────── */

/* 基礎重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Noto Serif SC', serif;
  background: var(--dao-ink-900, #110e0b);
  color: var(--dao-paper-100, #f5f0e8);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ─── 頂部標題欄 ─── */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: linear-gradient(180deg, var(--dao-ink-800, #1a1612) 0%, var(--dao-ink-900, #110e0b) 100%);
  border-bottom: 1px solid var(--dao-gold-800, #5a4a2a);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  z-index: 10;
}

.header-left { display: flex; align-items: baseline; gap: 1rem; }

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dao-cinnabar-500, #c23a2b);
  letter-spacing: 0.1em;
}

.site-subtitle {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.9rem;
  color: var(--dao-gold-600, #8a7a4a);
}

.header-right { display: flex; gap: 0.75rem; align-items: center; }

.scene-selector {
  padding: 0.5rem 1rem;
  background: var(--dao-ink-700, #2a2520);
  color: var(--dao-paper-100, #f5f0e8);
  border: 1px solid var(--dao-gold-800, #5a4a2a);
  border-radius: 2px;
  font-family: 'Noto Serif SC', serif;
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.2s;
}

.scene-selector:hover { border-color: var(--dao-cinnabar-500, #c23a2b); }
.scene-selector:focus { outline: none; border-color: var(--dao-cinnabar-500, #c23a2b); }

.action-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--dao-paper-200, #e8e0d5);
  border: 1px solid var(--dao-gold-800, #5a4a2a);
  border-radius: 2px;
  font-family: 'Noto Serif SC', serif;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn:hover {
  border-color: var(--dao-cinnabar-500, #c23a2b);
  color: var(--dao-cinnabar-500, #c23a2b);
}

/* ─── 主體佈局 ─── */
.solver-main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ─── 左側：範疇面板 ─── */
.category-panel {
  width: 40%;
  max-width: 480px;
  min-width: 360px;
  background: var(--dao-ink-800, #1a1612);
  border-right: 1px solid var(--dao-gold-900, #3a2a1a);
  overflow-y: auto;
  padding: 0;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--dao-gold-900, #3a2a1a);
  position: sticky;
  top: 0;
  background: var(--dao-ink-800, #1a1612);
  z-index: 5;
}

.panel-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--dao-gold-500, #c9a961);
  letter-spacing: 0.08em;
}

.panel-hint {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.8rem;
  color: var(--dao-ink-300, #6a5f50);
}

.volume-section { padding: 1rem 0; }

.volume-title {
  padding: 0.5rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dao-cinnabar-600, #a52f22);
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--dao-ink-700, #2a2520);
}

.category-list { padding: 0.5rem 0; }

/* 單個範疇行 */
.category-item {
  display: flex;
  align-items: center;
  padding: 0.625rem 1.5rem;
  gap: 1rem;
  transition: background 0.15s;
}

.category-item:hover { background: var(--dao-ink-750, #221e18); }

.category-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dao-paper-100, #f5f0e8);
  min-width: 2rem;
  text-align: center;
}

.category-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.category-subtitle {
  font-size: 0.75rem;
  color: var(--dao-ink-300, #6a5f50);
  font-weight: 400;
}

.category-dims {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.7rem;
  color: var(--dao-gold-800, #5a4a2a);
  font-style: italic;
}

/* 滑塊 */
.weight-slider-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 120px;
}

.weight-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 80px;
  height: 4px;
  background: var(--dao-ink-600, #3a3530);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.weight-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--dao-cinnabar-500, #c23a2b);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s;
}

.weight-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

.weight-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--dao-cinnabar-500, #c23a2b);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.weight-value {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.9rem;
  color: var(--dao-gold-500, #c9a961);
  min-width: 2rem;
  text-align: right;
}

/* ─── 右側：結果面板 ─── */
.result-panel {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  background: var(--dao-ink-900, #110e0b);
}

.stats-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--dao-ink-300, #6a5f50);
}

.stat-item strong {
  color: var(--dao-gold-500, #c9a961);
  font-family: 'Cormorant Garamond', serif;
  font-size: 1rem;
  font-weight: 600;
}

.stat-sep { color: var(--dao-ink-500, #4a4540); }

.result-section {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--dao-ink-800, #1a1612);
}

.section-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dao-azure-500, #3a6a8a);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--dao-ink-800, #1a1612);
}

.empty-hint {
  color: var(--dao-ink-400, #5a5550);
  font-style: italic;
  text-align: center;
  padding: 2rem;
}

/* 參數卡片 */
.params-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}

.param-card {
  background: var(--dao-ink-800, #1a1612);
  border: 1px solid var(--dao-ink-700, #2a2520);
  border-radius: 3px;
  padding: 0.75rem 1rem;
  transition: border-color 0.2s;
}

.param-card:hover { border-color: var(--dao-gold-800, #5a4a2a); }

.param-card.hard-constraint {
  border-color: var(--dao-cinnabar-700, #8a2a1a);
  background: rgba(194, 58, 43, 0.08);
}

.param-name {
  font-size: 0.8rem;
  color: var(--dao-gold-500, #c9a961);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.param-value {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.1rem;
  color: var(--dao-paper-100, #f5f0e8);
  font-weight: 600;
}

.param-value.true { color: var(--dao-cinnabar-500, #c23a2b); }
.param-value.false { color: var(--dao-ink-400, #5a5550); }

.param-desc {
  font-size: 0.7rem;
  color: var(--dao-ink-300, #6a5f50);
  margin-top: 0.25rem;
}

.param-source {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.7rem;
  font-style: italic;
  color: var(--dao-azure-600, #5a7a9a);
  margin-top: 0.25rem;
}

.hard-badge {
  display: inline-block;
  font-size: 0.6rem;
  padding: 1px 4px;
  background: var(--dao-cinnabar-700, #8a2a1a);
  color: var(--dao-paper-100, #f5f0e8);
  border-radius: 2px;
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* 場景預設按鈕 */
.scenes-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.scene-btn {
  padding: 0.5rem 1rem;
  background: var(--dao-ink-800, #1a1612);
  color: var(--dao-paper-200, #e8e0d5);
  border: 1px solid var(--dao-gold-900, #3a2a1a);
  border-radius: 3px;
  font-family: 'Noto Serif SC', serif;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.scene-btn:hover {
  border-color: var(--dao-cinnabar-500, #c23a2b);
  color: var(--dao-cinnabar-500, #c23a2b);
}

.scene-btn.active {
  background: var(--dao-cinnabar-900, #3a1a15);
  border-color: var(--dao-cinnabar-500, #c23a2b);
  color: var(--dao-cinnabar-300, #e85a4a);
}

.scene-tags {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.65rem;
  font-style: italic;
  color: var(--dao-ink-400, #5a5550);
  margin-left: 0.25rem;
}

/* ─── 底部 ─── */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 2rem;
  background: var(--dao-ink-800, #1a1612);
  border-top: 1px solid var(--dao-gold-900, #3a2a1a);
  font-size: 0.75rem;
  color: var(--dao-ink-400, #5a5550);
}

.footer-link {
  font-family: 'Cormorant Garamond', serif;
  color: var(--dao-gold-700, #9a8a5a);
}

/* ─── 滾動條 ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dao-ink-900, #110e0b); }
::-webkit-scrollbar-thumb {
  background: var(--dao-gold-900, #3a2a1a);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--dao-gold-800, #5a4a2a); }

/* ─── 導出下拉菜單 ─── */

.export-dropdown {
  position: relative;
}

.export-menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 160px;
  background: var(--dao-ink-800, #1c1713);
  border: 1px solid var(--dao-border, rgba(245,240,232,0.12));
  border-radius: var(--dao-radius-md, 3px);
  box-shadow: var(--shadow-3, 0 8px 32px rgba(10,8,6,0.55));
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--dao-duration-fast, 200ms) var(--dao-easing-natural, ease),
              visibility var(--dao-duration-fast, 200ms),
              transform var(--dao-duration-fast, 200ms) var(--dao-easing-natural, ease);
}

.export-dropdown.open .export-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.export-option {
  display: block;
  width: 100%;
  padding: 0.625rem 1rem;
  background: none;
  border: none;
  color: var(--dao-paper-200, #f0e7d4);
  font-family: var(--dao-font-body, serif);
  font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
  transition: background var(--dao-duration-instant, 100ms);
}

.export-option:hover {
  background: rgba(194, 58, 43, 0.15);
  color: var(--dao-cinnabar-300, #ee8f82);
}

.export-option:not(:last-child) {
  border-bottom: 1px solid var(--dao-border, rgba(245,240,232,0.08));
}

/* ─── 可視化區域 ─── */

.viz-section {
  padding: 0;
  overflow: hidden;
}

.viz-tabs {
  display: flex;
  border-bottom: 1px solid var(--dao-border, rgba(245,240,232,0.12));
  background: rgba(10, 8, 6, 0.3);
}

.viz-tab {
  flex: 1;
  padding: 0.625rem 1rem;
  background: none;
  border: none;
  color: var(--dao-ink-300, #a89880);
  font-family: var(--dao-font-body, serif);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color var(--dao-duration-fast, 200ms),
              background var(--dao-duration-fast, 200ms);
  border-bottom: 2px solid transparent;
}

.viz-tab:hover {
  color: var(--dao-paper-200, #f0e7d4);
}

.viz-tab.active {
  color: var(--dao-cinnabar-400, #e25d4c);
  border-bottom-color: var(--dao-cinnabar-500, #c23a2b);
  background: rgba(194, 58, 43, 0.05);
}

.viz-content {
  padding: 1rem;
  min-height: 320px;
}

.viz-panel {
  display: none;
}

.viz-panel.active {
  display: block;
  animation: paramEnter var(--dao-duration-normal, 400ms) var(--dao-easing-natural, ease) both;
}

/* ─── 雷達圖 ─── */

.radar-svg {
  display: block;
  margin: 0 auto;
  max-width: 400px;
  width: 100%;
  height: auto;
}

.radar-grid {
  fill: none;
  stroke: var(--dao-border, rgba(245,240,232,0.1));
  stroke-width: 0.5;
}

.radar-axis {
  stroke: var(--dao-border, rgba(245,240,232,0.08));
  stroke-width: 0.5;
}

.radar-area {
  fill: rgba(194, 58, 43, 0.15);
  stroke: var(--dao-cinnabar-500, #c23a2b);
  stroke-width: 1.5;
  transition: all var(--dao-duration-normal, 400ms) var(--dao-easing-natural, ease);
}

.radar-point {
  fill: var(--dao-cinnabar-400, #e25d4c);
  stroke: var(--dao-cinnabar-700, #8c2018);
  stroke-width: 1;
  transition: r var(--dao-duration-fast, 200ms);
}

.radar-point:hover {
  r: 5;
}

.radar-label {
  fill: var(--dao-ink-300, #a89880);
  font-family: var(--dao-font-display, serif);
  font-size: 11px;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}

.radar-label.active {
  fill: var(--dao-cinnabar-300, #ee8f82);
  font-weight: 600;
}

.radar-center-text {
  fill: var(--dao-gold-400, #b8956a);
  font-family: var(--dao-font-display, serif);
  font-size: 12px;
  text-anchor: middle;
  dominant-baseline: middle;
}

/* ─── 貢獻熱力圖 ─── */

.heatmap-container {
  overflow-x: auto;
  max-height: 400px;
  overflow-y: auto;
}

.heatmap-table {
  border-collapse: collapse;
  font-size: 0.75rem;
  width: 100%;
}

.heatmap-table th,
.heatmap-table td {
  padding: 0.25rem 0.4rem;
  text-align: center;
  border: 1px solid rgba(245, 240, 232, 0.06);
  white-space: nowrap;
}

.heatmap-table th {
  position: sticky;
  top: 0;
  background: var(--dao-ink-800, #1c1713);
  color: var(--dao-ink-300, #a89880);
  font-weight: 500;
  font-size: 0.7rem;
  z-index: 2;
}

.heatmap-table th.param-header {
  position: sticky;
  left: 0;
  z-index: 3;
  text-align: left;
  min-width: 120px;
  background: var(--dao-ink-800, #1c1713);
}

.heatmap-table td.param-name {
  text-align: left;
  color: var(--dao-paper-200, #f0e7d4);
  font-family: var(--dao-font-mono, monospace);
  font-size: 0.7rem;
  position: sticky;
  left: 0;
  background: var(--dao-ink-900, #110e0b);
  z-index: 1;
}

.heatmap-cell {
  transition: transform var(--dao-duration-instant, 100ms);
  cursor: default;
}

.heatmap-cell:hover {
  transform: scale(1.5);
  z-index: 5;
  position: relative;
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-size: 0.7rem;
  color: var(--dao-ink-300, #a89880);
}

.heatmap-legend-bar {
  width: 120px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(to right,
    rgba(194, 58, 43, 0.05),
    rgba(194, 58, 43, 0.4),
    rgba(194, 58, 43, 0.8),
    var(--dao-cinnabar-500, #c23a2b)
  );
}

/* ─── 場景對比 ─── */

.compare-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.compare-selector {
  flex: 1;
  min-width: 120px;
  padding: 0.5rem 0.75rem;
  background: var(--dao-ink-800, #1c1713);
  border: 1px solid var(--dao-border, rgba(245,240,232,0.12));
  border-radius: var(--dao-radius-md, 3px);
  color: var(--dao-paper-200, #f0e7d4);
  font-family: var(--dao-font-body, serif);
  font-size: 0.85rem;
  cursor: pointer;
}

.compare-selector:focus {
  outline: none;
  border-color: var(--dao-cinnabar-500, #c23a2b);
}

.compare-vs {
  color: var(--dao-gold-400, #b8956a);
  font-family: var(--dao-font-display, serif);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.compare-result {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.compare-table th,
.compare-table td {
  padding: 0.4rem 0.6rem;
  text-align: left;
  border-bottom: 1px solid rgba(245, 240, 232, 0.06);
}

.compare-table th {
  color: var(--dao-ink-300, #a89880);
  font-weight: 500;
  font-size: 0.75rem;
}

.compare-table th.col-a {
  color: var(--dao-azure-300, #7ba0c0);
}

.compare-table th.col-b {
  color: var(--dao-malachite-300, #7bb48b);
}

.compare-table td.param-col {
  color: var(--dao-paper-200, #f0e7d4);
  font-family: var(--dao-font-mono, monospace);
  font-size: 0.75rem;
}

.compare-table td.val-a {
  color: var(--dao-azure-200, #a8c0d7);
}

.compare-table td.val-b {
  color: var(--dao-malachite-200, #a8ceb2);
}

.compare-table td.diff-up {
  color: var(--dao-cinnabar-400, #e25d4c);
}

.compare-table td.diff-down {
  color: var(--dao-azure-400, #5482a8);
}

.compare-table tr.diff-row {
  background: rgba(194, 58, 43, 0.05);
}

.compare-summary {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  color: var(--dao-ink-300, #a89880);
}

.compare-summary strong {
  color: var(--dao-gold-400, #b8956a);
}

/* ─── 動效增強 ─── */

/* 參數卡片入場動畫 */
@keyframes paramEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.param-card {
  animation: paramEnter var(--dao-duration-normal, 400ms) var(--dao-easing-natural, cubic-bezier(0.4, 0, 0.2, 1)) both;
}

/* 硬約束觸發脈衝 */
@keyframes hardPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(194, 58, 43, 0);
  }
  50% {
    box-shadow: 0 0 12px 2px rgba(194, 58, 43, 0.3);
  }
}

.param-card.hard-constraint {
  animation: paramEnter var(--dao-duration-normal, 400ms) var(--dao-easing-natural, cubic-bezier(0.4, 0, 0.2, 1)) both,
             hardPulse var(--dao-duration-slow, 700ms) var(--dao-easing-organic, cubic-bezier(0.25, 0.46, 0.45, 0.94)) 0.4s 1;
}

/* 場景切換過渡 */
.result-section.transitioning {
  opacity: 0.3;
  transition: opacity var(--dao-duration-fast, 200ms) var(--dao-easing-natural, ease);
}

.result-section {
  transition: opacity var(--dao-duration-normal, 400ms) var(--dao-easing-natural, ease);
}

/* 滑塊拖動視覺反饋 */
.weight-slider:active::-webkit-slider-thumb {
  transform: scale(1.3);
  box-shadow: 0 0 8px rgba(194, 58, 43, 0.5);
}

.weight-slider:active::-moz-range-thumb {
  transform: scale(1.3);
  box-shadow: 0 0 8px rgba(194, 58, 43, 0.5);
}

/* 場景按鈕激活波紋 */
@keyframes sceneActivate {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.scene-btn.active {
  animation: sceneActivate var(--dao-duration-fast, 200ms) var(--dao-easing-natural, ease);
}

/* 統計數字變化高亮 */
@keyframes statHighlight {
  0% { color: var(--dao-cinnabar-400, #e25d4c); }
  100% { color: var(--dao-gold-500, #c9a961); }
}

.stat-item strong.changed {
  animation: statHighlight var(--dao-duration-normal, 400ms) var(--dao-easing-natural, ease);
}

/* ─── 響應式 ─── */

/* 平板:768px-900px */
@media (max-width: 900px) {
  .solver-main { flex-direction: column; }
  .category-panel {
    width: 100%;
    max-width: none;
    min-width: 0;
    max-height: 45vh;
  }
  .params-container { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}

/* 手機:≤768px */
@media (max-width: 768px) {
  .site-header {
    flex-wrap: wrap;
    padding: 0.75rem 1rem;
    gap: 0.5rem;
  }

  .header-left {
    flex: 1;
    gap: 0.5rem;
  }

  .site-title {
    font-size: 1.2rem;
    letter-spacing: 0.05em;
  }

  .site-subtitle {
    font-size: 0.75rem;
  }

  .header-right {
    width: 100%;
    justify-content: flex-end;
    gap: 0.5rem;
  }

  .scene-selector,
  .action-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }

  .category-panel {
    max-height: 40vh;
  }

  .panel-header {
    padding: 0.75rem 1rem;
  }

  .panel-title {
    font-size: 1rem;
  }

  .category-item {
    padding: 0.5rem 1rem;
    gap: 0.75rem;
  }

  .category-name {
    font-size: 1.1rem;
    min-width: 1.8rem;
  }

  .category-subtitle {
    font-size: 0.7rem;
  }

  .category-dims {
    font-size: 0.65rem;
  }

  .weight-slider-container {
    min-width: 100px;
    gap: 0.4rem;
  }

  .weight-slider {
    width: 60px;
  }

  /* 觸摸優化:增大滑塊 thumb */
  .weight-slider::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
  }

  .weight-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
  }

  .weight-value {
    font-size: 0.85rem;
    min-width: 1.8rem;
  }

  .result-section {
    padding: 1rem 1.25rem;
  }

  .section-title {
    font-size: 0.85rem;
  }

  .params-container {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .param-card {
    padding: 0.625rem 0.875rem;
  }

  .param-name {
    font-size: 0.75rem;
  }

  .param-value {
    font-size: 1rem;
  }

  .scenes-container {
    gap: 0.4rem;
  }

  .scene-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }

  .site-footer {
    padding: 0.5rem 1rem;
    font-size: 0.7rem;
    flex-direction: column;
    gap: 0.25rem;
    text-align: center;
  }
}

/* 小手機:≤480px */
@media (max-width: 480px) {
  .site-title {
    font-size: 1.1rem;
  }

  .site-subtitle {
    display: none;
  }

  .header-right {
    gap: 0.4rem;
  }

  .scene-selector,
  .action-btn {
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
  }

  .category-item {
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
  }

  .category-name {
    font-size: 1rem;
    min-width: 1.5rem;
  }

  .category-subtitle {
    font-size: 0.65rem;
  }

  .category-dims {
    display: none;
  }

  .weight-slider-container {
    min-width: 80px;
  }

  .weight-slider {
    width: 50px;
  }

  .weight-value {
    font-size: 0.8rem;
  }

  .result-section {
    padding: 0.875rem 1rem;
  }

  .param-card {
    padding: 0.5rem 0.75rem;
  }
}