/* ============================================================
   De&D Design System v4
   所有页面共享：配色/排版/导航/页脚/弹窗/筛选栏/产品卡/响应式
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary:      #ffffff;
  --bg-secondary:    #f8faf8;
  --bg-warm:         #f2f5f2;
  --bg-surface:      #ffffff;
  --text-primary:    #1a2318;
  --text-secondary:  #5a6b55;
  --text-muted:      #8a9a85;
  --accent-green:      #4caf50;
  --accent-light:      #81c784;
  --accent-dim:        rgba(76, 175, 80, 0.08);
  --accent-glow:       rgba(76, 175, 80, 0.15);
  --border-default:  #e8ece8;
  --border-light:    #f0f4f0;
  --border-green:    rgba(76, 175, 80, 0.2);
  --shadow-soft:     0 2px 16px rgba(26, 35, 24, 0.04);
  --shadow-card:     0 4px 24px rgba(26, 35, 24, 0.06);
  --shadow-elevated: 0 8px 40px rgba(26, 35, 24, 0.08);
  --shadow-green:    0 0 60px rgba(76, 175, 80, 0.08);
  --nav-height:      80px;
  --radius-sm:       4px;
  --radius-md:       8px;
  --radius-lg:       14px;
  --transition:      0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
  --font-display:    'Playfair Display', 'PingFang SC', 'Microsoft YaHei', serif;
  --font-body:       'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', -apple-system, sans-serif;
  --font-mono:       'SF Mono', 'Fira Code', monospace;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}
a { color: var(--accent-green); text-decoration: none; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg-warm); }
::-webkit-scrollbar-thumb { background: var(--border-default); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-green); }

/* --- Container --- */
.container { max-width: 1520px; margin: 0 auto; padding: 0 24px; }

/* --- Navigation --- */
#topNav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(28px, 5vw, 64px);
  transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
}
#topNav.scrolled {
  background: rgba(255,255,255,1);
  border-bottom-color: var(--border-light);
  box-shadow: 0 1px 8px rgba(26,35,24,0.04);
}
#topNav .brand {
  font-family: var(--font-display); font-size: 1.8rem; font-weight: 700;
  color: var(--text-primary); white-space: nowrap; letter-spacing: 1px;
}
#topNav .brand em { font-style: italic; color: var(--accent-green); font-weight: 400; }
#topNav .brand small {
  font-size: 0.8rem; color: var(--text-muted); font-family: var(--font-body);
  font-weight: 400; margin-left: 10px; letter-spacing: 0.06em;
}
#topNav .nav-links { display: flex; gap: 36px; list-style: none; align-items: center; }
#topNav .nav-links a {
  color: var(--text-secondary); font-size: 0.92rem; font-weight: 400;
  letter-spacing: 0.06em; white-space: nowrap;
  transition: color 0.3s; cursor: pointer; padding: 10px 0;
  position: relative;
}
#topNav .nav-links a::after {
  content: ''; position: absolute; bottom: 2px; left: 0; width: 0; height: 2px;
  background: var(--accent-green); transition: width 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
}
#topNav .nav-links a:hover, #topNav .nav-links a.active { color: var(--text-primary); }
#topNav .nav-links a:hover::after, #topNav .nav-links a.active::after { width: 100%; }

.lang-switch { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.lang-switch .lang-label {
  font-size: 0.85rem; color: var(--text-muted); letter-spacing: 0.06em; font-weight: 600;
  white-space: nowrap;
}
.lang-switch .lang-label .globe { margin-right: 2px; }
.lang-switch .lang-grid { display: flex; gap: 6px; }
.lang-switch button {
  background: #fff; border: 1px solid var(--border-default); color: var(--text-secondary);
  padding: 8px 16px; cursor: pointer; font-size: 0.9rem; font-weight: 700; letter-spacing: 0.03em;
  transition: var(--transition); font-family: var(--font-body);
  border-radius: 6px; white-space: nowrap;
}
.lang-switch button:hover { border-color: var(--accent-green); color: var(--accent-green); }
.lang-switch button.active {
  background: var(--accent-green); border-color: var(--accent-green); color: #fff;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; padding: 10px; }

/* --- Dropdown Menu --- */
#topNav .nav-links .has-dropdown { position: relative; }
#topNav .nav-links .has-dropdown > a .fa-chevron-down {
  font-size: 0.6rem; margin-left: 4px; transition: transform 0.25s;
}
#topNav .nav-links .submenu {
  display: none; position: absolute; top: 100%; left: -16px; min-width: 180px;
  background: #fff; border: 1px solid var(--border-default); border-radius: var(--radius-md);
  box-shadow: var(--shadow-elevated); padding: 8px 0; list-style: none;
  z-index: 1020; animation: fadeInDown 0.2s ease;
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
#topNav .nav-links .has-dropdown:hover > .submenu,
#topNav .nav-links .has-dropdown.dropdown-open > .submenu { display: block; }
#topNav .nav-links .has-dropdown:hover > a .fa-chevron-down { transform: rotate(180deg); }
#topNav .nav-links .submenu a {
  display: block; padding: 10px 22px; font-size: 0.88rem;
  color: var(--text-secondary); transition: background 0.15s, color 0.15s;
}
#topNav .nav-links .submenu a::after { display: none; }
#topNav .nav-links .submenu a:hover,
#topNav .nav-links .submenu a.active {
  background: var(--bg-warm); color: var(--text-primary);
}
#topNav .nav-links .submenu a.disabled {
  color: var(--text-muted); cursor: default; pointer-events: none;
}
#topNav .nav-links .submenu a.disabled:hover { background: transparent; }
.coming-soon-tag {
  font-size: 0.6rem; color: var(--accent-green); font-weight: 500;
  letter-spacing: 0.04em; margin-left: 8px; vertical-align: middle;
  background: rgba(76,175,80,0.08); padding: 1px 6px; border-radius: 3px;
}

/* --- Footer --- */
#siteFooter {
  position: relative; z-index: 10;
  border-top: 1px solid var(--border-default);
  padding: 28px 24px; text-align: center;
  color: var(--text-muted); font-size: 0.72rem; letter-spacing: 0.05em;
  background: var(--bg-warm);
}

/* --- View Header --- */
.view-header { margin-bottom: 36px; }
.back-btn {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--accent-green); cursor: pointer; font-size: 0.85rem;
  background: var(--accent-dim);
  padding: 8px 16px;
  border-radius: 999px;
  margin-bottom: 20px;
  transition: background 0.3s, color 0.3s;
}
.back-btn:hover { background: var(--accent-green); color: #fff; }
.view-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 600;
  line-height: 1.2; margin-bottom: 6px;
}
.view-subtitle { color: var(--text-muted); font-size: 0.9rem; }
.mat-header { text-align: center; }
.mat-subtitle {
  display: flex; align-items: center; justify-content: center; gap: 14px;
  color: var(--text-primary); font-size: 1.1rem; font-weight: 600;
}
.mat-subtitle::before,
.mat-subtitle::after {
  content: '';
  flex: 1; max-width: 44px; min-width: 20px;
  height: 1.5px;
  background: var(--accent-green); border-radius: 1px;
}

/* --- Filter Bar (shared style) --- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 24px; align-items: flex-start; }
.filter-group { display: flex; flex-direction: column; gap: 8px; }
.filter-group label {
  font-size: 0.75rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500;
}
.filter-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-btn {
  background: transparent; border: 1px solid var(--border-default); color: var(--text-secondary);
  padding: 8px 18px; cursor: pointer; font-size: 0.85rem;
  transition: var(--transition); white-space: nowrap; font-family: var(--font-body);
  border-radius: var(--radius-sm);
}
.filter-btn:hover { border-color: var(--accent-green); color: var(--text-primary); }
.filter-btn.active { background: var(--accent-green); border-color: var(--accent-green); color: #fff; font-weight: 500; }
.filter-btn:disabled { opacity: 0.35; cursor: not-allowed; pointer-events: none; }

.price-filter-row { display: flex; align-items: flex-end; gap: 10px; flex-wrap: wrap; }
.price-input {
  width: 90px; padding: 8px 10px; border: 1px solid var(--border-default);
  border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--text-primary);
  background: var(--bg-surface); font-family: var(--font-body); text-align: center;
}
.price-input:focus { outline: none; border-color: var(--accent-green); }
.price-btn {
  background: transparent; border: 1px solid var(--border-default); color: var(--text-secondary);
  padding: 7px 16px; cursor: pointer; font-size: 0.82rem; border-radius: var(--radius-sm);
  transition: var(--transition); font-family: var(--font-body); white-space: nowrap;
}
.price-btn:hover { border-color: var(--accent-green); color: var(--text-primary); }
.price-btn.confirm { background: var(--accent-green); border-color: var(--accent-green); color: #fff; }

/* --- Product Grid (shared) --- */
.product-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.product-card {
  background: var(--bg-surface); border-radius: var(--radius-lg); overflow: hidden;
  cursor: pointer; transition: all 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
  position: relative; box-shadow: 0 2px 12px rgba(26,35,24,0.05); border: none;
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(26,35,24,0.10); }

/* 品类色条 */
.product-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; z-index: 4; }
.product-card.cat-3layer::before { background: #8B5E3C; }
.product-card.cat-multi::before  { background: #6D8C6D; }
.product-card.cat-new3::before   { background: #C49A3C; }
.product-card.cat-parquet::before { background: #7B4B8A; }
.product-card.cat-spc::before     { background: #4A7C96; }

.product-card .card-img-wrap {
  width: 100%; height: 360px; background: #fcfcf9;
  padding: 0 8px;
  position: relative; overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(0,0,0,0.04), inset 0 -1px 0 rgba(0,0,0,0.02);
}
.product-card .card-img-wrap img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform 0.5s;
}
.product-card:hover .card-img-wrap img { transform: scale(1.06); }

/* hover 预览提示层 */
.product-card .card-img-wrap .img-overlay {
  position: absolute; inset: 0; background: rgba(26,35,24,0.08);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.3s; z-index: 2;
}
.product-card:hover .card-img-wrap .img-overlay { opacity: 1; }
.product-card .card-img-wrap .img-overlay span {
  background: rgba(255,255,255,0.95); color: var(--text-primary);
  padding: 8px 18px; border-radius: 20px; font-size: 0.82rem;
  font-weight: 500; letter-spacing: 0.04em;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.product-card .card-img-wrap .img-fb {
  position: absolute; inset: 0; display: none; align-items: center;
  justify-content: center; color: var(--text-muted); font-size: 2.5rem; z-index: 1;
}

.product-card .card-tag {
  position: absolute; top: 14px; left: 14px; z-index: 5;
  font-size: 0.66rem; padding: 4px 12px; letter-spacing: 0.08em;
  text-transform: uppercase; font-weight: 600; font-family: var(--font-body);
  border-radius: 20px;
}
.product-card .card-tag.hot { background: #d32f2f; color: #fff; }
.product-card .card-tag.new { background: var(--accent-green); color: #fff; }

.product-card .card-body { padding: 18px 20px 20px; position: relative; z-index: 2; }
.product-card .card-body h4 {
  font-size: 1.05rem; font-weight: 500; margin-bottom: 8px;
  color: var(--text-primary); line-height: 1.3;
}

/* 型号小黑标（名称右侧） */
.product-card .card-body .model-badge {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700;
  background: #1a2318; color: #fff;
  padding: 2px 10px; border-radius: 4px; letter-spacing: 0.05em;
  margin-left: 6px; vertical-align: middle;
  display: inline-block;
}

.product-card .card-body .meta { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.product-card .card-body .meta .pill {
  font-size: 0.7rem; padding: 4px 12px; border-radius: 20px;
  background: var(--bg-warm); color: var(--text-secondary);
  font-weight: 500; letter-spacing: 0.03em;
  display: flex; align-items: center; gap: 4px;
}
.product-card .card-body .meta .pill.shape { background: #e8f5e9; color: #2e7d32; }
.product-card .card-body .meta .pill.veneer { background: #fff3e0; color: #e65100; }

.product-card .card-body .price {
  font-family: var(--font-mono); font-size: 1.2rem; font-weight: 700;
  color: var(--accent-green);
}
.product-card .card-body .price small { font-size: 0.7rem; color: var(--text-muted); font-weight: 400; }

/* --- Modal (shared) --- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(26,35,24,0.5); z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-container {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-lg); max-width: 1300px; width: 98%;
  max-height: 96vh; overflow-y: auto; position: relative;
  box-shadow: var(--shadow-green), var(--shadow-elevated);
}
.modal-close {
  position: absolute; top: 12px; right: 12px; z-index: 10;
  background: var(--bg-warm); border: 1px solid var(--border-default); color: var(--text-primary);
  width: 40px; height: 40px; border-radius: 50%; cursor: pointer; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { border-color: var(--accent-green); color: var(--accent-green); }
.modal-body { display: flex; align-items: stretch; min-height: 520px; }
.detail-gallery {
  width: 46%; flex-shrink: 0; background: var(--bg-warm);
  display: flex; flex-direction: column; justify-content: center;
  padding: 16px; position: relative; min-height: 500px;
}
.detail-gallery .gallery { position: relative; border-radius: var(--radius-md); overflow: hidden; flex: 1; }
.detail-gallery .gallery img { width: 100%; height: 100%; object-fit: contain; display: block; cursor: zoom-in; }
.detail-info { flex: 1; padding: 28px 28px 28px 24px; overflow-y: auto; min-width: 0; }
.detail-info h2 { font-size: 1.2rem; font-weight: 600; margin-bottom: 2px; line-height: 1.3; }
.detail-info .modal-model { color: var(--text-muted); margin-bottom: 10px; font-size: 0.82rem; }
.detail-info .price-large { font-family: var(--font-mono); font-size: 1.5rem; color: var(--accent-green); font-weight: 700; margin: 12px 0; }

.specs-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; margin: 14px 0; }
.spec-cell { background: rgba(74,124,63,0.06); border-radius: 10px; padding: 12px 14px; display: flex; flex-direction: column; justify-content: center; transition: background 0.2s; }
.spec-cell:hover { background: rgba(74,124,63,0.13); }
.spec-cell .spec-icon { font-size: 1rem; margin-bottom: 3px; }
.spec-cell .spec-value { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); }
.spec-cell .spec-label { font-size: 0.65rem; color: var(--text-muted); margin-top: 1px; }
.spec-cell.highlight { background: var(--accent-green); }
.spec-cell.highlight .spec-value, .spec-cell.highlight .spec-label { color: #fff; }
.detail-desc { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); line-height: 1.8; margin-top: 12px; }
.detail-cta { display: flex; gap: 8px; margin-top: 10px; }
.btn-inquire {
  padding: 10px 24px; background: var(--accent-green); color: #fff;
  border: none; border-radius: 8px; font-size: 0.85rem; font-weight: 600; cursor: pointer;
}
.gallery-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(0,0,0,0.4); border: none; color: #fff;
  width: 38px; height: 56px; cursor: pointer; font-size: 1.4rem;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s; z-index: 2; font-family: var(--font-body);
  opacity: 0; pointer-events: none;
}
.gallery:hover .gallery-arrow { opacity: 1; pointer-events: auto; }
.gallery-arrow:hover { background: rgba(0,0,0,0.7); }
.gallery-arrow-left { left: 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.gallery-arrow-right { right: 0; border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.gallery-dots { display: flex; justify-content: center; gap: 6px; margin-top: 10px; }
.gallery-dots .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border-default); cursor: pointer; transition: background 0.2s; }
.gallery-dots .dot.active { background: var(--accent-green); }

/* --- Lightbox --- */
.lightbox-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.92); z-index: 3000;
  display: flex; align-items: center; justify-content: center; cursor: zoom-out;
}
.lightbox-overlay img { max-width: 95vw; max-height: 95vh; object-fit: contain; border-radius: 4px; }
.lightbox-close {
  position: fixed; top: 20px; right: 24px; z-index: 3001;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  color: #fff; width: 44px; height: 44px; border-radius: 50%;
  cursor: pointer; font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
}
.lightbox-close:hover { background: rgba(255,255,255,0.25); }
.lightbox-hint { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%); z-index: 3001; color: rgba(255,255,255,0.5); font-size: 0.78rem; pointer-events: none; }

/* --- CTA Button --- */
.cta-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 36px;
  background: transparent; border: 1px solid var(--accent-green);
  color: var(--accent-green);
  font-family: var(--font-body); font-size: 0.85rem; font-weight: 500;
  letter-spacing: 0.06em; cursor: pointer;
  transition: all 0.4s; position: relative; overflow: hidden;
}
.cta-btn::before {
  content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
  background: var(--accent-green); z-index: -1;
  transition: left 0.5s cubic-bezier(0.7, 0, 0.3, 1);
}
.cta-btn:hover { color: #fff; }
.cta-btn:hover::before { left: 0; }

/* --- FAQ --- */
.faq-list { max-width: 760px; }
.faq-item { border-bottom: 1px solid var(--border-default); }
.faq-question {
  width: 100%; background: none; border: none; color: var(--text-primary);
  padding: 18px 0; font-size: 0.9rem; cursor: pointer; text-align: left;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-body); transition: color 0.3s;
}
.faq-question:hover { color: var(--accent-green); }
.faq-question i { transition: transform 0.35s ease; font-size: 0.7rem; color: var(--text-muted); }
.faq-question.open i { transform: rotate(180deg); color: var(--accent-green); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; color: var(--text-secondary); line-height: 1.8; }
.faq-answer.show { max-height: 300px; padding-bottom: 18px; }
.faq-answer p { font-size: 0.85rem; }

/* --- Contact Form --- */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.contact-info-item i { font-size: 1.2rem; color: var(--accent-green); width: 20px; text-align: center; margin-top: 2px; }
.contact-info-item h4 { font-size: 0.68rem; color: var(--text-muted); margin-bottom: 4px; letter-spacing: 0.1em; text-transform: uppercase; }
.contact-info-item p { color: var(--text-primary); font-size: 0.93rem; }
.contact-form input, .contact-form textarea {
  width: 100%; background: var(--bg-surface); border: 1px solid var(--border-default);
  color: var(--text-primary); padding: 14px 18px;
  font-family: var(--font-body); font-size: 0.9rem; margin-bottom: 14px;
  transition: border-color 0.3s; border-radius: var(--radius-sm);
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--accent-green); outline: none; }
.contact-form textarea { min-height: 120px; resize: vertical; }

/* --- Cooperation Grid --- */
.coop-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 36px; }
.coop-card {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-md); padding: 32px 24px; text-align: center;
  transition: var(--transition); box-shadow: var(--shadow-soft);
}
.coop-card:hover { border-color: var(--accent-green); transform: translateY(-3px); box-shadow: var(--shadow-card); }
.coop-card i { font-size: 1.8rem; color: var(--accent-green); margin-bottom: 16px; display: block; }
.coop-card h3 { font-size: 0.95rem; font-weight: 500; margin-bottom: 8px; }
.coop-card p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.7; }

/* --- Case Bento Grid --- */
.case-bento {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 18px;
}
.case-bento-item {
  position: relative; overflow: hidden; cursor: pointer;
  border: 1px solid var(--border-default); border-radius: var(--radius-md);
  transition: var(--transition); box-shadow: var(--shadow-soft);
}
.case-bento-item:hover { border-color: var(--accent-green); box-shadow: var(--shadow-card); transform: translateY(-2px); }
.case-bento-item.featured { grid-row: span 2; }
.case-bento-item .case-img {
  width: 100%; min-height: 240px; background: var(--bg-warm);
  display: flex; align-items: center; justify-content: center; font-size: 3rem;
}
.case-bento-item .case-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 24px;
  background: linear-gradient(transparent, rgba(255,255,255,0.94));
}
.case-bento-item .case-info h3 { font-size: 1.05rem; font-weight: 500; margin-bottom: 4px; }
.case-bento-item .case-info .case-meta { font-size: 0.7rem; color: var(--text-muted); display: flex; gap: 14px; }

/* --- Stats --- */
.stat-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 36px; }
.stat-card {
  text-align: center; padding: 36px 20px;
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-md); box-shadow: var(--shadow-soft); transition: var(--transition);
}
.stat-card:hover { border-color: var(--border-green); }
.stat-card .stat-num { font-family: var(--font-display); font-size: clamp(1.8rem, 3.5vw, 2.8rem); color: var(--accent-green); }
.stat-card .stat-lbl { font-size: 0.72rem; color: var(--text-muted); letter-spacing: 0.06em; margin-top: 6px; }

/* --- About Text --- */
.about-text { max-width: 800px; line-height: 2; color: var(--text-secondary); }

/* --- Video Grid --- */
.video-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.video-card {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-md); overflow: hidden;
  transition: var(--transition); box-shadow: var(--shadow-soft);
}
.video-card:hover { border-color: var(--accent-green); box-shadow: var(--shadow-card); }
.video-card video { width: 100%; height: 220px; object-fit: cover; display: block; background: #000; }
.video-card .video-name { padding: 14px 18px; font-size: 0.88rem; color: var(--text-primary); font-weight: 500; }

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .series-products { grid-template-columns: repeat(3, 1fr); }
  .case-bento { grid-template-columns: 1fr 1fr; }
  .case-bento-item.featured { grid-row: span 1; }
  .coop-grid { grid-template-columns: 1fr 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .stat-cards { grid-template-columns: repeat(3, 1fr); }
  #topNav .nav-links { gap: 18px; }
  #topNav .nav-links a { font-size: 0.74rem; }
}
@media (max-width: 768px) {
  #topNav .nav-links { display: none; }
  #topNav .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: var(--nav-height); left: 0; right: 0;
    background: rgba(255,255,255,0.99); padding: 16px 24px;
    border-bottom: 1px solid var(--border-default); gap: 0;
    box-shadow: var(--shadow-elevated); max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
  }
  #topNav .nav-links.open a { padding: 14px 0; font-size: 0.85rem; }
  /* 移动端子菜单非悬浮，改为内嵌 */
  #topNav .nav-links .submenu {
    position: static; box-shadow: none; border: none;
    background: transparent; padding: 0 0 0 20px; min-width: 0;
    display: none; animation: none;
  }
  #topNav .nav-links .has-dropdown:hover > .submenu { display: none; }
  #topNav .nav-links .has-dropdown.dropdown-open > .submenu { display: block; }
  #topNav .nav-links .submenu a { padding: 10px 0; font-size: 0.82rem; }
  .mobile-menu-btn { display: block; }
  .lang-switch .lang-label { display: none; }
  .lang-switch button { padding: 6px 10px; font-size: 0.8rem; }
  .product-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .case-bento { grid-template-columns: 1fr; }
  .coop-grid { grid-template-columns: 1fr; }
  .stat-cards { grid-template-columns: 1fr; gap: 12px; }
  .video-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .modal-body { flex-direction: column; }
  .detail-gallery { width: 100%; flex-shrink: unset; min-height: 260px; max-height: 320px; }
  .detail-info { padding: 16px 20px 20px; overflow-y: visible; }
}
@media (max-width: 640px) {
  .product-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   Series Group Layout (Flooring V3)
   ============================================================ */

/* Series group container */
.series-group { margin-bottom: 48px; }

/* Series header card (full-width, display-only) */
.series-header {
  display: flex; align-items: center; gap: 20px;
  padding: 20px 24px; border-radius: var(--radius-lg);
  background: var(--bg-primary); border: 1px solid var(--border-default);
  box-shadow: var(--shadow-soft); position: relative; overflow: hidden;
}
.series-header::before {
  content: ''; position: absolute; top: 0; left: 0;
  width: 5px; height: 100%; background: var(--accent-green);
  border-radius: 5px 0 0 5px;
}
.series-header .series-icon {
  width: 56px; height: 56px; border-radius: var(--radius-md);
  background: var(--accent-dim); display: flex;
  align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
}
.series-header .series-info { flex: 1; }
.series-header .series-info h3 {
  font-family: var(--font-display); font-size: 1.2rem;
  font-weight: 600; color: var(--text-primary); margin-bottom: 4px;
}
.series-header .series-info .series-meta {
  font-size: 0.82rem; color: var(--text-muted);
  display: flex; gap: 14px; flex-wrap: wrap;
}
.series-header .series-info .series-meta span {
  display: flex; align-items: center; gap: 4px;
}
.series-header .series-count {
  background: var(--accent-dim); color: var(--accent-green);
  padding: 6px 16px; border-radius: 20px;
  font-weight: 700; font-size: 0.82rem;
  white-space: nowrap; flex-shrink: 0;
}

/* Mini product cards grid */
.series-products {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px; margin-top: 14px; padding-left: 12px;
}

/* Mini product card */
.mini-card {
  background: var(--bg-primary); border-radius: var(--radius-md);
  overflow: hidden; cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
  box-shadow: 0 1px 8px rgba(26,35,24,0.04);
  border: 1px solid var(--border-light);
}
.mini-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }
.mini-card .mc-img {
  width: 100%; height: 130px; background: #fcfcf9;
  position: relative; overflow: hidden;
}
.mini-card .mc-img img {
  width: 100%; height: 100%; object-fit: contain;
  display: block; transition: transform 0.4s;
}
.mini-card:hover .mc-img img { transform: scale(1.05); }
.mini-card .mc-body { padding: 10px 12px 12px; }
.mini-card .mc-body .mc-model {
  font-family: var(--font-mono); font-size: 0.75rem;
  font-weight: 700; color: var(--text-primary); margin-bottom: 2px;
}
.mini-card .mc-body .mc-name {
  font-size: 0.72rem; color: var(--text-muted); margin-bottom: 6px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mini-card .mc-body .mc-price {
  font-family: var(--font-mono); font-size: 0.9rem;
  font-weight: 700; color: var(--accent-green);
}

/* Ungrouped products section */
.ungrouped-section {
  margin-top: 48px; padding-top: 28px;
  border-top: 2px dashed var(--border-default);
}
.ungrouped-section .section-label {
  font-family: var(--font-display); font-size: 1.05rem;
  font-weight: 600; color: var(--text-muted); margin-bottom: 18px;
}

/* Responsive: series */
@media (max-width: 600px) {
  .series-header { padding: 14px 16px; }
  .series-header .series-icon { width: 40px; height: 40px; font-size: 1.1rem; }
  .series-header .series-info h3 { font-size: 1rem; }
  .series-products { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   Flooring V3 Decision Tree — 材质卡 / 形状卡 / 星级
   ============================================================ */

/* --- 材质卡列表 --- */
.mat-list { display: flex; flex-direction: column; gap: 16px; }

/* --- 材质列表左侧“向下滑动”提示条 --- */
.mat-area { display: flex; align-items: flex-start; gap: 18px; }
.mat-area .mat-list { flex: 1; min-width: 0; }
.mat-scroll-hint {
  flex: 0 0 auto;
  display: flex; flex-direction: column; align-items: center;
  gap: 14px;
  padding: 8px 4px 8px 0;
  position: relative;
  left: -60px;
  top: 110px;
}
.mat-scroll-hint .fa-angles-down {
  font-size: 2.3rem; color: var(--accent-green);
  animation: scrollHintBounce 1.6s ease-in-out infinite;
}
.mat-scroll-hint-text {
  writing-mode: vertical-rl;
  font-size: 1.4rem; font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  white-space: nowrap;
}
@keyframes scrollHintBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}
@media (max-width: 768px) {
  .mat-scroll-hint { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .mat-scroll-hint .fa-angles-down { animation: none; }
}

/* --- 产品列表左侧“下滑查看更多同类产品”提示条 --- */
.prod-area { display: flex; align-items: flex-start; gap: 18px; }
.prod-area .products { flex: 1; min-width: 0; }
.prod-scroll-hint {
  flex: 0 0 auto;
  display: flex; flex-direction: column; align-items: center;
  gap: 14px;
  padding: 8px 4px 8px 0;
  position: relative;
  left: -60px;
  top: 110px;
}
.prod-scroll-hint .fa-angles-down {
  font-size: 2rem; color: var(--accent-green);
  animation: scrollHintBounce 1.6s ease-in-out infinite;
}
.prod-scroll-hint-text {
  writing-mode: vertical-rl;
  font-size: 1.2rem; font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  white-space: nowrap;
}
@media (max-width: 768px) {
  .prod-scroll-hint { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .prod-scroll-hint .fa-angles-down { animation: none; }
}
.mat-card {
  position: relative; display: grid;
  grid-template-columns: 500px 1fr auto;
  gap: 26px; align-items: center;
  background: var(--bg-surface); border: 1.5px solid var(--border-default);
  border-radius: var(--radius-lg); padding: 22px 30px 22px 26px;
  cursor: pointer; box-shadow: var(--shadow-soft);
  transition: transform 0.3s var(--transition), border-color 0.3s, border-width 0.3s, box-shadow 0.3s;
}
.mat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--cat-color, var(--accent-green));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.mat-card:hover { transform: translateY(-6px); border-color: var(--accent-green); border-width: 2.5px; box-shadow: 0 16px 36px rgba(26, 35, 24, 0.16); z-index: 60; }

.mat-id { display: flex; align-items: center; gap: 18px; }
.mat-visual { display: flex; flex-direction: column; align-items: center; gap: 6px; flex-shrink: 0; margin-right: 20px; }
.mat-diagram-wrap {
  position: relative; width: 200px; height: 133px; flex-shrink: 0;
}
.mat-diagram-img {
  width: 100%; height: 100%; object-fit: contain; display: block;
  background: #fff; border-radius: 3px;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08);
}
.mat-diagram-fallback {
  display: none; width: 100%; height: 100%; border-radius: 3px; overflow: hidden;
  flex-direction: column; background: #fff;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08);
}
.mat-diagram-wrap.no-img .mat-diagram-fallback { display: flex; }
.mat-diagram-wrap.no-img .mat-diagram-img { display: none; }
.mat-diagram-wrap.no-img .mat-diagram-pop { display: none; }
.mat-diagram-fallback .md-layer { position: relative; }

/* 悬停放大预览（2.5 倍，右上弹出） */
.mat-diagram-pop {
  position: absolute; left: calc(100% + 16px); top: 0; width: 500px;
  opacity: 0; visibility: hidden; transform: scale(0.94); transform-origin: top left;
  transition: opacity 0.2s var(--transition), transform 0.2s var(--transition), visibility 0s 0.2s;
  z-index: 100; pointer-events: none;
  background: #fff; border-radius: 8px; overflow: hidden;
  box-shadow: 0 12px 40px rgba(26, 35, 24, 0.18);
}
.mat-diagram-pop img { width: 100%; height: auto; display: block; }
.mat-diagram-wrap:hover .mat-diagram-pop {
  opacity: 1; visibility: visible; transform: scale(1);
  transition: opacity 0.2s var(--transition), transform 0.2s var(--transition), visibility 0s;
}
.mat-struct-label { font-size: 0.6rem; color: var(--text-muted); letter-spacing: 0.06em; text-transform: uppercase; white-space: nowrap; }
.mat-name { flex: 1 1 auto; min-width: 0; }
.mat-name .zh { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; line-height: 1.2; }
.mat-name .en { display: block; font-size: 0.72rem; color: var(--text-muted); letter-spacing: 0.04em; margin-top: 2px; }

/* 各材质剖面图层（CSS 回退占位，flex 比例填满容器） */
.diagram-3layer .md-top { flex: 3; background: #A0784B; }
.diagram-3layer .md-mid { flex: 5; background: #D4C4A8; }
.diagram-3layer .md-bot { flex: 2; background: #C4A882; }
.diagram-multi .md-top { flex: 1; background: #B8936E; }
.diagram-multi .md-mid { flex: 5; background: repeating-linear-gradient(0deg, #E0D0B8 0px, #E0D0B8 5px, #D8C8B0 5px, #D8C8B0 8px); }
.diagram-multi .md-bot { flex: 2; background: #C4A882; }
.diagram-new3 .md-top { flex: 1; background: #C4A078; }
.diagram-new3 .md-mid { flex: 6; background: #E8DCC8; }
.diagram-new3 .md-bot { flex: 3; background: #C4A882; }
.diagram-spc .md-top { flex: 1; background: #B0B8C0; }
.diagram-spc .md-mid { flex: 6; background: #7B8D9E; }
.diagram-spc .md-bot { flex: 3; background: #A09080; }
.diagram-laminate .md-top { flex: 1; background: #D8E0E6; }
.diagram-laminate .md-decor { flex: 1; background: #B8936E; }
.diagram-laminate .md-mid { flex: 6; background: #6E7B63; }
.diagram-laminate .md-bot { flex: 2; background: #C4A882; }
.diagram-solid .md-top { flex: 1; background: repeating-linear-gradient(90deg, #A0784B 0 3px, #B8936E 3px 6px, #C49A3C 6px 7px); }
.diagram-parquet .md-top { flex: 3; background: repeating-linear-gradient(45deg, #A0784B 0 8px, #C49A3C 8px 16px, #8B5E3C 16px 24px, #C4A882 24px 32px); }
.diagram-parquet .md-mid { flex: 5; background: #D4C4A8; }
.diagram-parquet .md-bot { flex: 2; background: #C4A882; }

/* --- 三维度星级 --- */
.mat-features { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.mat-features .feat { display: grid; grid-template-columns: 20px auto; grid-template-rows: auto auto; column-gap: 10px; row-gap: 3px; align-items: center; font-size: 0.85rem; }
.mat-features .feat .feat-ic { grid-column: 1; grid-row: 1; width: 20px; text-align: center; }
.mat-features .feat .feat-label { grid-column: 2; grid-row: 1; color: var(--text-secondary); white-space: nowrap; }
.mat-features .feat .stars { grid-column: 2; grid-row: 2; justify-self: start; display: inline-flex; gap: 1px; letter-spacing: 0; }
.mat-features .feat .stars .star { font-size: 1.05rem; line-height: 1; }
.mat-features .feat .stars .star.full { color: #E9A23B; }
.mat-features .feat .stars .star.off { color: #d8ddd8; }
.mat-features .feat .stars .star.half {
  background: linear-gradient(90deg, #E9A23B 50%, #d8ddd8 50%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.mat-features .feat-none { color: var(--text-primary); font-size: 1rem; align-self: center; }

/* --- 材质卡右段：价格 + 数量 + 点击提醒 --- */
.mat-cta { text-align: right; display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.mat-cta .mat-price { font-family: var(--font-mono); font-size: 1.25rem; font-weight: 700; color: var(--accent-green); white-space: nowrap; }
.mat-cta .mat-count { font-size: 0.78rem; color: var(--text-muted); white-space: nowrap; }
.mat-cta .mat-count b { color: var(--text-secondary); font-weight: 600; }
.mat-cta .view-btn {
  margin-top: 2px; display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px; border: 1px solid var(--accent-green); border-radius: 20px;
  color: var(--accent-green); font-size: 0.78rem; font-weight: 500; white-space: nowrap;
  transition: background 0.3s, color 0.3s;
}
.mat-card:hover .view-btn { background: var(--accent-green); color: #fff; }

/* --- 形状舞台（三张卡占满一页） --- */
.shape-stage { display: flex; gap: 24px; align-items: stretch; margin-bottom: 28px; }
.shape-card {
  flex: 1;
  min-height: calc((100vh - 190px) * 0.8);
  position: relative;
  overflow: hidden;
  background: var(--bg-surface); border: 1.5px solid var(--border-default);
  border-radius: var(--radius-lg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer; box-shadow: var(--shadow-soft);
  transition: border-color 0.3s, border-width 0.3s, box-shadow 0.3s, background 0.3s,
              transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.35s var(--transition);
}
.shape-stage:not(.folded) .shape-card:hover { border-color: var(--accent-green); border-width: 3.375px; box-shadow: 0 16px 36px rgba(26, 35, 24, 0.16); transform: translateY(-6px); }
.shape-stage:not(.folded) .shape-card:hover .sc-bg { transform: scale(1.05); }

/* 背景图：展开态铺满，折叠态淡出 */
.shape-card .sc-bg {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%; object-fit: cover;
  transition: opacity 0.35s ease, transform 0.5s ease;
}

/* 中央磨砂块：展开态显示，折叠态淡出 */
.shape-card .sc-glass {
  position: absolute; z-index: 1;
  top: 33.333%; left: 50%;
  transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 22px 28px;
  border-radius: 16px;
  background: rgba(0, 0, 0, 0.45);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #fff; text-align: center;
  max-width: 88%;
}
.shape-card .sc-glass .sc-name { color: #fff; font-family: var(--font-display); font-size: 1.4rem; font-weight: 600; }
.shape-card .sc-glass .sc-en { display: block; font-size: 0.8rem; color: rgba(255,255,255,0.75); font-family: var(--font-body); font-weight: 400; letter-spacing: 0.04em; }
.shape-card .sc-glass .sc-desc { font-size: 0.88rem; color: rgba(255,255,255,0.85); }
.shape-card .sc-glass .sc-count { font-size: 0.8rem; color: #fff; background: rgba(255,255,255,0.18); padding: 5px 18px; border-radius: 20px; }

/* 折叠条：展开态隐藏，折叠态显示 */
.shape-card .sc-foldbar { display: none; }

/* 折叠态：无背景图，纯文字 + 简易图标 + 打勾 */
.shape-stage.folded { margin-bottom: 20px; }
.shape-stage.folded .shape-card { min-height: 0; padding: 18px 20px; border-color: var(--text-primary); }
.shape-stage.folded .sc-bg { opacity: 0; }
.shape-stage.folded .sc-glass { position: absolute; opacity: 0; pointer-events: none; }
.shape-stage.folded .sc-foldbar {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 10px;
  color: var(--text-primary);
}
.shape-stage.folded .sc-foldbar .sc-icon { font-size: 3rem; line-height: 1; color: var(--accent-green); }
.shape-stage.folded .sc-foldbar .sc-icon svg { display: block; }
.shape-stage.folded .sc-foldbar .sc-name { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; }

/* 折叠动画：innerHTML 重渲染，transition 不生效，用 animation 模拟塌陷 + 交叉淡入淡出 */
.shape-stage.fold-anim .shape-card { animation: foldIn 0.55s cubic-bezier(0.22, 1, 0.36, 1) both; }
.shape-stage.fold-anim .sc-bg { animation: bgFade 0.4s ease both; }
.shape-stage.fold-anim .sc-glass { animation: glassFade 0.4s ease both; }
.shape-stage.fold-anim .sc-foldbar { animation: foldbarIn 0.45s ease 0.15s both; }
@keyframes foldIn { from { min-height: calc((100vh - 190px) * 0.8); padding: 0; } to { min-height: 0; padding: 18px 20px; } }
@keyframes bgFade { from { opacity: 1; } to { opacity: 0; } }
@keyframes glassFade { from { opacity: 1; } to { opacity: 0; } }
@keyframes foldbarIn { from { opacity: 0; } to { opacity: 1; } }

/* 选中强化：勾选标记 + 未选降透明 + 选中上浮 */
.shape-card.active { border-color: var(--accent-green); background: var(--accent-dim); box-shadow: 0 0 0 3px var(--accent-glow); }
.shape-stage.folded .shape-card.active .sc-foldbar .sc-name { color: var(--accent-green); }
.shape-card .sc-check { display: none; }
.shape-card.active .sc-check { display: inline-flex; align-items: center; justify-content: center; width: 18px; height: 18px; border-radius: 50%; background: var(--accent-green); color: #fff; font-size: 0.6rem; flex: none; animation: checkPop 0.35s cubic-bezier(0.22, 1, 0.36, 1) 0.28s both; }
@keyframes checkPop { from { opacity: 0; transform: scale(0.3); } to { opacity: 1; transform: scale(1); } }
.shape-stage.folded .shape-card.active { transform: translateY(-2px); }
.shape-stage.folded .shape-card:not(.active) { opacity: 0.55; }

/* 结果标签 + 空状态 */
.result-label { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 20px; min-height: 1.4em; }
.result-label strong { color: var(--text-primary); }
.shape-hint {
  display: flex; align-items: center; justify-content: center; gap: 14px;
  color: var(--text-primary);
  font-size: 1.1rem; font-weight: 600;
  margin-bottom: 24px;
}
.shape-hint::before,
.shape-hint::after {
  content: '';
  flex: 1; max-width: 44px; min-width: 20px;
  height: 1.5px;
  background: var(--accent-green); border-radius: 1px;
}
.empty-state { text-align: center; padding: 80px 20px; color: var(--text-muted); }
.empty-state i { font-size: 3rem; display: block; margin-bottom: 16px; }

/* 产品出现动效 B：交错淡入（系列分组为单位） */
.products.anim-b .series-group { animation: cascadeIn 0.5s var(--transition) both; }
.products.anim-b .series-group:nth-child(1) { animation-delay: 0s; }
.products.anim-b .series-group:nth-child(2) { animation-delay: 0.08s; }
.products.anim-b .series-group:nth-child(3) { animation-delay: 0.16s; }
.products.anim-b .series-group:nth-child(4) { animation-delay: 0.24s; }
.products.anim-b .series-group:nth-child(5) { animation-delay: 0.32s; }
.products.anim-b .series-group:nth-child(6) { animation-delay: 0.40s; }
.products.anim-b .series-group:nth-child(n+7) { animation-delay: 0.48s; }
@keyframes cascadeIn { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

/* 响应式：材质卡 / 形状卡 */
@media (max-width: 960px) {
  .mat-card { grid-template-columns: 360px 1fr; }
  .mat-cta { grid-column: 1 / -1; flex-direction: row; align-items: center; justify-content: space-between; border-top: 1px dashed var(--border-default); padding-top: 14px; }
}
@media (max-width: 720px) {
  .shape-stage { flex-direction: column; }
  .shape-card { min-height: 200px; }
  .shape-stage.folded .shape-card { min-height: 0; }
}
@media (max-width: 640px) {
  .mat-card { grid-template-columns: 1fr; padding: 18px 20px; }
  .mat-cta { flex-direction: row; align-items: center; justify-content: space-between; border-top: 1px dashed var(--border-default); padding-top: 14px; }
}

/* 悬停放大：尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .mat-diagram-pop { transition: none; }
}