/**
 * design-system.css — 中文站 UI 范本页专用
 * 依赖：cn-design-tokens.css（变量）、可选 headenstyle.css（导航演示）
 * 根包裹：.ds-shell
 */

body.design-system-page {
  background: var(--cn-color-canvas) !important;
  color: var(--cn-color-ink);
  font-family: var(--cn-font-sans);
  line-height: var(--cn-leading-body);
}

.ds-shell {
  --ds-ink-strong: #14181f;
  --ds-slate: #2d3a4a;
  --ds-accent-warm: #c45c26;
  --ds-accent-warm-hover: #a34d1f;
  --ds-success: #0d7d52;
  --ds-warning-bg: #fff8e6;
  --ds-warning-border: #f0c96a;
  --ds-info-bg: #eef6ff;
  --ds-radius-lg: 14px;
  --ds-radius-xl: 18px;
  --ds-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

.ds-shell {
  max-width: min(1180px, 100% - 2rem);
  margin: 0 auto;
  padding: 1.5rem 0 4rem;
}

.ds-banner {
  background: linear-gradient(135deg, #ffffff 0%, #f0f4fa 55%, #e8eef8 100%);
  border: 1px solid var(--cn-color-border);
  border-radius: var(--ds-radius-xl);
  box-shadow: var(--cn-shadow-md);
  padding: clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2.5rem);
  margin-bottom: 2rem;
  text-align: center;
}

.ds-banner h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  color: var(--ds-ink-strong);
  letter-spacing: -0.02em;
}

.ds-banner p {
  margin: 0;
  color: var(--cn-color-ink-muted);
  font-size: 0.95rem;
}

.ds-meta {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  margin-top: 1rem;
  justify-content: center;
}

.ds-meta span {
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: rgba(39, 144, 244, 0.1);
  color: var(--cn-color-accent);
  font-weight: 600;
}

/* ----- Section scaffold ----- */
.ds-section {
  background: var(--cn-color-surface);
  border: 1px solid var(--cn-color-border);
  border-radius: var(--cn-radius-md);
  box-shadow: var(--cn-shadow-sm);
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
  margin-bottom: 1.75rem;
}

.ds-section-title {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ds-slate);
  letter-spacing: -0.01em;
}

.ds-section-desc {
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  color: var(--cn-color-ink-muted);
  line-height: 1.55;
}

.ds-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cn-color-ink-muted);
  margin-bottom: 0.5rem;
}

/* ----- Color swatches ----- */
.ds-swatches {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.ds-swatch {
  border-radius: var(--cn-radius-sm);
  overflow: hidden;
  border: 1px solid var(--cn-color-border);
  background: var(--cn-color-surface);
}

.ds-swatch-color {
  height: 64px;
}

.ds-swatch-info {
  padding: 0.5rem 0.65rem;
  font-size: 0.75rem;
  color: var(--cn-color-ink-muted);
}

.ds-swatch-info strong {
  display: block;
  color: var(--cn-color-ink);
  font-size: 0.8rem;
  margin-bottom: 0.15rem;
}

/* ----- Typography scale ----- */
.ds-type-row {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--cn-color-border);
}

.ds-type-row:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.ds-type-sample {
  color: var(--cn-color-ink);
}

.ds-h1 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; margin: 0 0 0.25rem; letter-spacing: -0.02em; }
.ds-h2 { font-size: 1.35rem; font-weight: 650; margin: 0 0 0.25rem; color: var(--ds-slate); }
.ds-h3 { font-size: 1.1rem; font-weight: 600; margin: 0 0 0.25rem; }
.ds-lead { font-size: 1.05rem; color: var(--cn-color-ink-muted); margin: 0; line-height: 1.6; }
.ds-body { font-size: 0.95rem; margin: 0; line-height: 1.65; }
.ds-caption { font-size: 0.8rem; color: var(--cn-color-ink-muted); margin: 0.25rem 0 0; }

/* ----- Buttons ----- */
.ds-btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}

.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.15rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--cn-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: background 0.18s var(--ds-ease), color 0.18s, border-color 0.18s, box-shadow 0.18s;
  font-family: inherit;
}

.ds-btn--primary {
  background: var(--cn-color-accent);
  color: #fff !important;
  box-shadow: 0 2px 8px rgba(39, 144, 244, 0.35);
}

.ds-btn--primary:hover {
  background: var(--cn-color-accent-hover);
  color: #fff !important;
}

.ds-btn--secondary {
  background: var(--cn-color-surface);
  color: var(--cn-color-accent) !important;
  border-color: var(--cn-color-accent);
}

.ds-btn--secondary:hover {
  background: rgba(39, 144, 244, 0.06);
}

.ds-btn--commerce {
  background: linear-gradient(180deg, #e85d2a 0%, var(--ds-accent-warm) 100%);
  color: #fff !important;
  border-color: transparent;
  box-shadow: 0 2px 10px rgba(196, 92, 38, 0.35);
}

.ds-btn--commerce:hover {
  background: linear-gradient(180deg, #f06d3a 0%, var(--ds-accent-warm-hover) 100%);
  color: #fff !important;
}

.ds-btn--ghost {
  background: transparent;
  color: var(--cn-color-ink-muted) !important;
  border-color: var(--cn-color-border);
}

.ds-btn--ghost:hover {
  border-color: var(--cn-color-accent);
  color: var(--cn-color-accent) !important;
}

.ds-btn--lg {
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
}

.ds-btn--sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.ds-btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ----- Product / marketing cards ----- */
.ds-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.ds-card {
  border: 1px solid var(--cn-color-border);
  border-radius: var(--cn-radius-md);
  overflow: hidden;
  background: linear-gradient(180deg, #fafbfc 0%, #fff 100%);
  transition: box-shadow 0.2s var(--ds-ease), border-color 0.2s;
}

.ds-card:hover {
  border-color: rgba(39, 144, 244, 0.45);
  box-shadow: var(--cn-shadow-md);
}

.ds-card-img {
  aspect-ratio: 4 / 3;
  background: linear-gradient(145deg, #e8ecf2, #dfe6ef);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cn-color-ink-muted);
  font-size: 0.8rem;
}

.ds-card-body {
  padding: 0.85rem 1rem 1rem;
}

.ds-card-body h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ds-ink-strong);
}

.ds-card-body p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--cn-color-ink-muted);
  line-height: 1.5;
}

.ds-price {
  margin-top: 0.65rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ds-accent-warm);
}

.ds-price small {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--cn-color-ink-muted);
}

/* ----- Tag cloud ----- */
.ds-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.55rem;
  align-items: center;
  line-height: 1.2;
}

.ds-tag {
  display: inline-block;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  background: #eef2f7;
  color: var(--ds-slate);
  border: 1px solid var(--cn-color-border);
  text-decoration: none !important;
  transition: background 0.15s, border-color 0.15s;
}

.ds-tag:hover {
  border-color: var(--cn-color-accent);
  background: rgba(39, 144, 244, 0.08);
  color: var(--cn-color-accent) !important;
}

.ds-tag--hot {
  background: rgba(232, 93, 42, 0.12);
  border-color: rgba(232, 93, 42, 0.35);
  color: var(--ds-accent-warm) !important;
}

.ds-tag--lg { font-size: 0.95rem; padding: 0.4rem 0.85rem; }
.ds-tag--sm { font-size: 0.68rem; padding: 0.2rem 0.5rem; }

/* ----- Carousel：滑动 + 底部分页点（主流营销站模式） ----- */
.ds-carousel-wrap {
  position: relative;
}

.ds-carousel {
  position: relative;
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 0.25rem 0 0.5rem;
  margin: 0;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x;
  /* 隐藏横条，避免与「点」双轨；仍可用滑动手势与点控 */
  scrollbar-width: none;
}

.ds-carousel::-webkit-scrollbar {
  display: none;
  height: 0;
}

.ds-carousel:focus {
  outline: 2px solid rgba(39, 144, 244, 0.35);
  outline-offset: 2px;
}

.ds-slide {
  flex: 0 0 min(320px, 86vw);
  scroll-snap-align: center;
  border-radius: var(--cn-radius-md);
  border: 1px solid var(--cn-color-border);
  background: var(--cn-color-surface);
  min-height: 160px;
  padding: 1.25rem;
  box-shadow: var(--cn-shadow-sm);
}

.ds-slide h4 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.ds-slide p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--cn-color-ink-muted);
}

.ds-carousel-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--cn-color-ink-muted);
  margin: 0.35rem 0 0.15rem;
}

.ds-dots {
  display: flex;
  gap: 0.45rem;
  justify-content: center;
  align-items: center;
  margin-top: 0.35rem;
  padding: 0.25rem 0;
}

.ds-dot {
  appearance: none;
  margin: 0;
  padding: 0;
  border: 0;
  cursor: pointer;
  height: 6px;
  width: 6px;
  border-radius: 999px;
  background: #c5ccd6;
  transition: width 0.28s cubic-bezier(0.22, 1, 0.36, 1), background 0.2s ease, transform 0.2s ease;
  flex-shrink: 0;
}

.ds-dot:hover {
  background: #9aa6b8;
}

.ds-dot.ds-dot--edge:hover {
  background: transparent;
}

.ds-dot.is-active {
  width: 22px;
  background: var(--cn-color-accent);
}

/* 首尾：短三角（仍对应第 1 / 末屏，与中间圆点同一套索引逻辑） */
.ds-dot.ds-dot--edge {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 4px;
  background: transparent;
  position: relative;
  flex-shrink: 0;
}

.ds-dot.ds-dot--edge::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  border-style: solid;
  transition: border-color 0.2s ease, filter 0.2s ease;
}

.ds-dot--edge-prev::before {
  margin-left: -1px;
  border-width: 5px 7px 5px 0;
  border-color: transparent #9aa6b8 transparent transparent;
}

.ds-dot--edge-next::before {
  margin-left: 1px;
  border-width: 5px 0 5px 7px;
  border-color: transparent transparent transparent #9aa6b8;
}

.ds-dot--edge:hover::before {
  filter: brightness(0.85);
}

.ds-dot--edge.is-active {
  width: 1.25rem;
  background: transparent;
}

.ds-dot--edge-prev.is-active::before {
  border-right-color: var(--cn-color-accent);
}

.ds-dot--edge-next.is-active::before {
  border-left-color: var(--cn-color-accent);
}

.ds-dot:focus-visible {
  outline: 2px solid var(--cn-color-accent);
  outline-offset: 3px;
}

/* ----- Breadcrumb ----- */
.ds-breadcrumb {
  font-size: 0.85rem;
  color: var(--cn-color-ink-muted);
}

.ds-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.ds-breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--cn-color-border);
}

.ds-breadcrumb a {
  color: var(--cn-color-ink-muted);
  text-decoration: none !important;
}

.ds-breadcrumb a:hover {
  color: var(--cn-color-accent);
}

/* ----- Spec table (industrial) ----- */
.ds-table-wrap {
  overflow-x: auto;
  border-radius: var(--cn-radius-sm);
  border: 1px solid var(--cn-color-border);
}

.ds-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.ds-table th,
.ds-table td {
  padding: 0.55rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--cn-color-border);
  transition: background-color 0.16s ease;
}

.ds-table th {
  background: #e8ecf2;
  font-weight: 600;
  color: var(--ds-slate);
  white-space: nowrap;
}

/* 数据行：奇浅 / 偶略深，形成斑马底纹 */
.ds-table tbody tr:nth-child(odd) td {
  background-color: #ffffff;
}

.ds-table tbody tr:nth-child(even) td {
  background-color: #eef2f8;
}

.ds-table tr:last-child td {
  border-bottom: 0;
}

/* 悬停：明显亮于奇/偶行，形成「斑马 + 行悬停」反馈 */
.ds-table tbody tr:hover td {
  background-color: #c5daf5 !important;
}

/* ----- Forms ----- */
.ds-form-row {
  display: grid;
  gap: 0.75rem;
  max-width: 480px;
}

.ds-form-msg {
  margin: 0;
  padding: 0.65rem 0.75rem;
  border-radius: var(--cn-radius-sm);
  font-size: 0.88rem;
  line-height: 1.45;
}

.ds-form-msg--ok {
  background: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #a5d6a7;
}

.ds-form-msg--err {
  background: #ffebee;
  color: #c62828;
  border: 1px solid #ffcdd2;
}

.ds-req-mark {
  color: var(--ds-accent-warm);
  font-weight: 700;
}

.ds-fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.ds-fieldset legend {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
  color: var(--ds-slate);
  padding: 0;
}

.ds-legend-hint {
  font-weight: 400;
  color: var(--cn-color-ink-muted);
  font-size: 0.78rem;
}

.ds-check-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  align-items: center;
}

.ds-check {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--cn-color-ink);
  cursor: pointer;
  user-select: none;
}

.ds-check input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--cn-color-accent);
  cursor: pointer;
}

.ds-field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--ds-slate);
}

.ds-field input,
.ds-field select,
.ds-field textarea {
  width: 100%;
  box-sizing: border-box;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--cn-color-border);
  border-radius: var(--cn-radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.ds-field input:focus,
.ds-field select:focus,
.ds-field textarea:focus {
  outline: none;
  border-color: var(--cn-color-accent);
  box-shadow: 0 0 0 3px rgba(39, 144, 244, 0.15);
}

/* ----- Accordion / FAQ ----- */
.ds-accordion details {
  border: 1px solid var(--cn-color-border);
  border-radius: var(--cn-radius-sm);
  margin-bottom: 0.45rem;
  padding: 0.55rem 0.85rem;
  background: #fafbfc;
}

.ds-accordion summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--cn-color-ink);
}

.ds-accordion details[open] summary {
  color: var(--cn-color-accent);
}

.ds-accordion p {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  color: var(--cn-color-ink-muted);
}

/* ----- CTA strip ----- */
.ds-cta-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--ds-radius-lg);
  background: linear-gradient(120deg, #1e3a5f 0%, #2a5080 40%, #1a4a7a 100%);
  color: #e8eef5;
}

.ds-cta-strip p {
  margin: 0;
  font-size: 0.95rem;
  max-width: 36rem;
  line-height: 1.55;
}

.ds-cta-strip strong {
  color: #fff;
}

/* ----- Badges & alerts ----- */
.ds-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.ds-badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 4px;
}

.ds-badge--new {
  background: rgba(39, 144, 244, 0.15);
  color: var(--cn-color-accent);
}

.ds-badge--stock {
  background: rgba(13, 125, 82, 0.12);
  color: var(--ds-success);
}

.ds-badge--sale {
  background: rgba(232, 93, 42, 0.15);
  color: var(--ds-accent-warm);
}

.ds-alert {
  padding: 0.75rem 1rem;
  border-radius: var(--cn-radius-sm);
  font-size: 0.88rem;
  margin-bottom: 0.65rem;
}

.ds-alert--info {
  background: var(--ds-info-bg);
  border: 1px solid rgba(39, 144, 244, 0.25);
  color: var(--ds-slate);
}

.ds-alert--warn {
  background: var(--ds-warning-bg);
  border: 1px solid var(--ds-warning-border);
  color: #5c4a1a;
}

/* ----- Nav demo box (isolated from sticky issues) ----- */
.ds-nav-demo {
  border: 1px dashed var(--cn-color-border);
  border-radius: var(--cn-radius-md);
  /* 必须为 visible，否则桌面端 absolute 下拉会被裁切 */
  overflow: visible;
  background: #fff;
  position: relative;
  z-index: 10;
}

.ds-nav-demo > p {
  margin: 0;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  color: var(--cn-color-ink-muted);
  background: #f3f5f8;
  border-bottom: 1px solid var(--cn-color-border);
}

/* 范本内导航：取消 sticky，保证下拉层叠在卡片之上 */
.ds-nav-demo nav {
  position: relative;
  top: auto;
  z-index: 20;
}

/* 导航区块本身也要允许溢出，避免被外层圆角/阴影影响观感 */
#nav-demo.ds-section {
  overflow: visible;
  z-index: 5;
}

/* ----- Trust / logo strip ----- */
.ds-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: #f3f5f8;
  border-radius: var(--cn-radius-md);
  border: 1px solid var(--cn-color-border);
}

.ds-trust span {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--cn-color-ink-muted);
  padding: 0.35rem 0.65rem;
  background: #fff;
  border-radius: var(--cn-radius-sm);
  border: 1px solid var(--cn-color-border);
}

/* ----- Pagination ----- */
.ds-pagination {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  flex-wrap: wrap;
}

.ds-page-btn {
  min-width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--cn-radius-sm);
  border: 1px solid var(--cn-color-border);
  background: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--cn-color-ink-muted) !important;
  text-decoration: none !important;
}

.ds-page-btn:hover {
  border-color: var(--cn-color-accent);
  color: var(--cn-color-accent) !important;
}

.ds-page-btn.is-current {
  background: var(--cn-color-accent);
  border-color: var(--cn-color-accent);
  color: #fff !important;
}

/* ----- Divider ----- */
.ds-hr {
  border: 0;
  height: 1px;
  background: var(--cn-color-border);
  margin: 1.5rem 0;
}