/* ==========================================================================
   力通 · 英飞凌代理官网 — 设计 token 与基础样式
   T0.3：仅 tokens + base。组件样式在 T1.* 追加。
   ========================================================================== */

:root {
  /* 色彩 */
  --color-primary: #0072ce;
  --color-primary-dark: #005ba3;
  --color-primary-light: #e6f2fb;
  --color-accent: #f5821f;
  --color-accent-dark: #d96c0e;
  --color-neutral-50: #f8f9fa;
  --color-neutral-100: #f1f3f5;
  --color-neutral-200: #e9ecef;
  --color-neutral-400: #adb5bd;
  --color-neutral-600: #6c757d;
  --color-neutral-800: #343a40;
  --color-neutral-900: #212529;
  --color-success: #1e9e5a;
  --color-warning: #f5821f;
  --color-white: #ffffff;
  --color-footer: #0b2239;

  /* 字体 */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-body: 16px;
  --text-sm: 14px;
  --text-xs: 13px;
  --text-h1: 40px;
  --text-h2: 30px;
  --text-h3: 22px;
  --text-h4: 18px;
  --lh-body: 1.75;
  --lh-tight: 1.3;

  /* 间距（8px 基准） */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.14);

  /* 边框 */
  --border: 1px solid var(--color-neutral-200);

  /* 容器与断点 */
  --container-max: 1319px;
  --gutter-desktop: 32px;
  --gutter-tablet: 24px;
  --gutter-mobile: 16px;

  /* z-index */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-nav: 30;
  --z-modal: 50;
  --z-toast: 60;

  /* 动效 */
  --ease: ease-out;
  --dur-fast: 150ms;
  --dur-base: 200ms;
  --dur-slow: 300ms;
}

/* 基础重置 */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--lh-body);
  color: var(--color-neutral-800);
  background: var(--color-white);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 var(--space-4);
  color: var(--color-neutral-900);
  font-weight: 700;
  line-height: var(--lh-tight);
}

h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-h4); }

p {
  margin: 0 0 var(--space-6);
}

ul,
ol {
  margin: 0 0 var(--space-6);
  padding-left: 1.4em;
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gutter-desktop);
}

/* 无障碍 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  z-index: var(--z-toast);
}

.skip-link:focus {
  left: var(--space-4);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 1200px) {
  .container { padding: 0 var(--gutter-desktop); }
}

@media (min-width: 768px) and (max-width: 1199px) {
  .container { padding: 0 var(--gutter-tablet); }
  h1 { font-size: 34px; }
  h2 { font-size: 26px; }
}

@media (max-width: 767px) {
  .container { padding: 0 var(--gutter-mobile); }
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  h3 { font-size: 19px; }
  h4 { font-size: 17px; }
  p { margin-bottom: var(--space-4); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   T1.1 顶部导航（Header）
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-neutral-200);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  min-height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-neutral-900);
  text-decoration: none;
  flex-shrink: 0;
}

.logo:hover {
  text-decoration: none;
}

.logo-mark {
  display: inline-flex;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.logo-tagline {
  display: none;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-neutral-600);
  max-width: 210px;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-1);
  color: var(--color-neutral-800);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.has-dropdown > .nav-link::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-left: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  padding: var(--space-2);
  margin: 0;
  list-style: none;
  background: var(--color-white);
  border: var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility var(--dur-fast);
}

.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-neutral-800);
  font-size: 14px;
  text-decoration: none;
}

.dropdown a:hover,
.dropdown a:focus-visible {
  background: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.header-cta:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-neutral-800);
  border-radius: 2px;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  padding: var(--space-4) var(--gutter-mobile) var(--space-6);
  border-top: 1px solid var(--color-neutral-200);
  background: var(--color-white);
}

.mobile-nav-list {
  margin: 0 0 var(--space-4);
  padding: 0;
  list-style: none;
}

.mobile-nav-list a {
  display: block;
  padding: var(--space-3) 0;
  min-height: 48px;
  color: var(--color-neutral-800);
  font-size: 16px;
  font-weight: 500;
  border-bottom: 1px solid var(--color-neutral-100);
  text-decoration: none;
}

.mobile-nav-cta {
  display: flex;
  width: 100%;
  justify-content: center;
}

/* 移动端打开抽屉时锁定页面滚动 */
body.nav-open {
  overflow: hidden;
}

/* 英文标语在 <1000px 隐藏以保留头部空间；完整标语在页脚与 logo alt 中保留 */
@media (min-width: 1000px) {
  .logo-tagline { display: inline; }
}

@media (max-width: 999px) {
  .site-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .mobile-nav:not([hidden]) { display: block; }
}

@media (max-width: 767px) {
  .header-inner { min-height: 60px; gap: var(--space-4); }
  .logo-text { font-size: 18px; }
  .header-actions .header-cta { display: none; }
}

/* ==========================================================================
   T1.2 页脚（Footer）
   ========================================================================== */

.site-footer {
  background: var(--color-footer);
  color: #cfd8e3;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: var(--space-8);
  padding-top: var(--space-16);
  padding-bottom: var(--space-12);
}

.footer-brand-name {
  margin-bottom: var(--space-3);
  color: var(--color-white);
  font-size: 22px;
  font-weight: 700;
}

.footer-brand-name span {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9fb3c8;
}

.footer-intro,
.footer-contact p {
  margin-bottom: var(--space-2);
  color: #cfd8e3;
  font-size: 14px;
}

.footer-slogan {
  margin-top: var(--space-3);
  color: #9fb3c8;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-title {
  margin-bottom: var(--space-4);
  color: var(--color-white);
  font-size: 16px;
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a,
.footer-contact a {
  color: #cfd8e3;
  font-size: 14px;
  text-decoration: none;
}

.footer-links a:hover,
.footer-contact a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-qq strong {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.footer-bottom-inner p {
  margin: 0;
  color: #9fb3c8;
  font-size: 13px;
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-bottom-links a {
  color: #9fb3c8;
  font-size: 13px;
}

@media (max-width: 999px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    padding-top: var(--space-12);
  }
  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ==========================================================================
   T1.3 面包屑（Breadcrumb）
   ========================================================================== */

.breadcrumb {
  margin: var(--space-4) 0 var(--space-6);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  color: var(--color-neutral-600);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--color-neutral-400);
}

.breadcrumb-item a {
  color: var(--color-neutral-600);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.breadcrumb-item[aria-current="page"] {
  color: var(--color-neutral-900);
  font-weight: 500;
}

@media (max-width: 767px) {
  .breadcrumb {
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  .breadcrumb-list { flex-wrap: nowrap; }
}

/* ==========================================================================
   T1.4 按钮（Button）
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-6);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.btn:hover { text-decoration: none; }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-ghost {
  padding: 0 var(--space-2);
  background: transparent;
  color: var(--color-primary);
}

.btn-ghost:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.btn-danger {
  background: transparent;
  color: var(--color-neutral-600);
  border-color: var(--color-neutral-200);
}

.btn-sm {
  min-height: 36px;
  padding: 0 var(--space-3);
  font-size: 14px;
}

.btn-block { width: 100%; }

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn.is-loading {
  pointer-events: none;
  opacity: 0.7;
}

/* ==========================================================================
   T1.5 卡片（Card）
   ========================================================================== */

.card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--color-white);
  border: var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.card-media {
  aspect-ratio: 16 / 9;
  background: var(--color-neutral-50);
  overflow: hidden;
}

.card-media img,
.card-media svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
}

.card-title {
  margin: 0;
  font-size: 18px;
}

.card-text {
  margin: 0;
  color: var(--color-neutral-600);
  font-size: 14px;
}

.card-meta {
  display: flex;
  gap: var(--space-3);
  color: var(--color-neutral-600);
  font-size: 13px;
}

.card-link {
  margin-top: auto;
  font-weight: 600;
}

.card-link::after { content: " →"; }

.card--icon .card-media {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1;
}

.card--icon .card-media svg {
  width: 48px;
  height: 48px;
}

@media (prefers-reduced-motion: reduce) {
  .card:hover { transform: none; }
}

/* ==========================================================================
   T1.6 标签 / 徽章（Badge / Tag）
   ========================================================================== */

.badge,
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  line-height: 1;
}

.badge-stock-in {
  background: rgba(30, 158, 90, 0.12);
  color: var(--color-success);
}

.badge-stock-inquiry {
  background: rgba(245, 130, 31, 0.14);
  color: var(--color-accent-dark);
}

.badge-stock-in::before,
.badge-stock-inquiry::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.badge-category {
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
}

.tag {
  background: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

.tag:hover {
  background: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
}

/* ==========================================================================
   T1.7 动态型号表格（Data Table）
   ========================================================================== */

.table-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.table-search {
  flex: 1 1 220px;
  min-height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 14px;
  color: var(--color-neutral-800);
  background: var(--color-white);
}

.table-search:focus-visible {
  border-color: var(--color-primary);
}

.table-count {
  color: var(--color-neutral-600);
  font-size: 13px;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 32px;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-primary-light);
  border-radius: var(--radius-pill);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 13px;
  cursor: pointer;
}

.filter-chip::after {
  content: "×";
  font-size: 14px;
  line-height: 1;
}

.table-wrap {
  overflow-x: auto;
  border: var(--border);
  border-radius: var(--radius-md);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table caption {
  padding: var(--space-3);
  color: var(--color-neutral-600);
  font-size: 13px;
  text-align: left;
}

.data-table th,
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
  text-align: left;
  white-space: nowrap;
}

.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--color-neutral-50);
  color: var(--color-neutral-900);
  font-weight: 700;
}

.data-table tbody tr:nth-child(even) {
  background: var(--color-neutral-50);
}

.data-table tbody tr:hover {
  background: var(--color-primary-light);
}

.data-table th[data-sort] {
  cursor: pointer;
  user-select: none;
}

.data-table th[data-sort]::after {
  content: "↕";
  margin-left: var(--space-1);
  color: var(--color-neutral-400);
  font-size: 12px;
}

.data-table th[aria-sort="ascending"]::after { content: "↑"; color: var(--color-primary); }
.data-table th[aria-sort="descending"]::after { content: "↓"; color: var(--color-primary); }

.data-table .col-model {
  font-weight: 600;
}

.data-table .col-model a {
  color: var(--color-primary);
}

.table-empty {
  padding: var(--space-8);
  color: var(--color-neutral-600);
  text-align: center;
}

.table-empty[hidden] { display: none; }

@media (max-width: 767px) {
  .data-table { min-width: 640px; }
  .data-table th:first-child,
  .data-table td:first-child {
    position: sticky;
    left: 0;
    z-index: 2;
    background: var(--color-white);
  }
  .data-table thead th:first-child {
    background: var(--color-neutral-50);
    z-index: 3;
  }
  .data-table tbody tr:nth-child(even) td:first-child {
    background: var(--color-neutral-50);
  }
}

/* ==========================================================================
   T1.8 选项卡（Tabs）
   ========================================================================== */

.tabs {
  border-bottom: 1px solid var(--color-neutral-200);
}

.tab-list {
  display: flex;
  gap: var(--space-6);
  overflow-x: auto;
  margin: 0;
  padding: 0;
  list-style: none;
  -webkit-overflow-scrolling: touch;
}

.tab {
  min-height: 48px;
  padding: 0 var(--space-1);
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--color-neutral-600);
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
}

.tab:hover { color: var(--color-primary); }

.tab[aria-selected="true"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-panel {
  padding-top: var(--space-6);
}

.tab-panel[hidden] { display: none; }

/* ==========================================================================
   T1.9 FAQ
   ========================================================================== */

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.faq-item {
  padding: 0 var(--space-4);
  border: var(--border);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.faq-item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  color: var(--color-neutral-900);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  color: var(--color-primary);
  font-size: 20px;
  line-height: 1;
}

.faq-item[open] summary::after { content: "−"; }

.faq-a {
  padding-bottom: var(--space-4);
  color: var(--color-neutral-600);
  font-size: 15px;
}

.faq-a p:last-child,
.faq-a ul:last-child {
  margin-bottom: 0;
}

.faq-a strong { color: var(--color-neutral-800); }

@media (max-width: 767px) {
  .faq-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   T1.10 侧边栏（Sidebar）
   ========================================================================== */

.layout-sidebar {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-8);
  align-items: start;
}

.layout-content-sidebar {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-8);
  align-items: start;
}

.sidebar { min-width: 0; }

.sidebar-sticky {
  position: sticky;
  top: 100px;
}

.sidebar-title {
  margin-bottom: var(--space-3);
  font-size: 16px;
}

.sidebar-nav {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-neutral-800);
  font-size: 14px;
  text-decoration: none;
}

.sidebar-nav a:hover,
.sidebar-nav a.is-active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

.sidebar-nav .count {
  color: var(--color-neutral-600);
  font-size: 12px;
}

.toc {
  padding: var(--space-4);
  border: var(--border);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc-list a {
  display: block;
  padding: var(--space-1) 0;
  color: var(--color-neutral-600);
  font-size: 14px;
  text-decoration: none;
}

.toc-list a:hover,
.toc-list a.is-active {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.sidebar-card {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border: var(--border);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.sidebar-card p:last-child { margin-bottom: 0; }

.related-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-list li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-neutral-100);
}

.related-list li:last-child { border-bottom: 0; }

.related-list a { font-size: 14px; }

@media (max-width: 999px) {
  .layout-sidebar,
  .layout-content-sidebar {
    grid-template-columns: 1fr;
  }
  .sidebar-sticky { position: static; }
}

/* ==========================================================================
   T1.11 详情页通用元素（分销商 CTA）
   ========================================================================== */

.detail-cta {
  margin-top: var(--space-12);
  padding: var(--space-8) 0;
  background: var(--color-footer);
  color: #cfd8e3;
}

.detail-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.detail-cta h2 {
  margin-bottom: var(--space-2);
  color: var(--color-white);
  font-size: 24px;
}

.detail-cta p { margin: 0; }

.detail-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  flex-shrink: 0;
}

@media (max-width: 767px) {
  .detail-cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ==========================================================================
   T1.12 CTA 区块 + 询价/咨询表单
   ========================================================================== */

.cta-block {
  padding: var(--space-12) 0;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  text-align: center;
}

.cta-block h2 {
  color: var(--color-white);
  font-size: 30px;
}

.cta-block p {
  max-width: 720px;
  margin: 0 auto var(--space-6);
  color: rgba(255, 255, 255, 0.9);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-field { display: flex; flex-direction: column; gap: var(--space-2); }

.form-field--full { grid-column: 1 / -1; }

.form-label {
  color: var(--color-neutral-800);
  font-size: 14px;
  font-weight: 600;
}

.form-label .required { color: var(--color-accent-dark); }

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  color: var(--color-neutral-800);
  font: inherit;
  font-size: 15px;
}

.form-textarea { min-height: 120px; resize: vertical; }

.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
  border-color: var(--color-primary);
}

.form-error {
  color: #c0392b;
  font-size: 13px;
}

.form-note {
  color: var(--color-neutral-600);
  font-size: 13px;
}

@media (max-width: 767px) {
  .form-grid { grid-template-columns: 1fr; }
  .cta-block h2 { font-size: 24px; }
}

/* ==========================================================================
   T1.13 分页（Pagination）
   ========================================================================== */

.pagination {
  display: flex;
  justify-content: center;
  margin-top: var(--space-8);
}

.pagination-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  color: var(--color-neutral-800);
  font-size: 14px;
  text-decoration: none;
}

.page-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

.page-link.is-current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.page-link[aria-disabled="true"] {
  opacity: 0.4;
  pointer-events: none;
}

/* ==========================================================================
   T2 页面级布局
   ========================================================================== */

.section { padding: var(--space-12) 0; }
.section--alt { background: var(--color-neutral-50); }

.section-head {
  max-width: 760px;
  margin-bottom: var(--space-8);
}

.section-title { margin-bottom: var(--space-3); }
.section-desc { color: var(--color-neutral-600); }

.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.page-header { padding: var(--space-8) 0 var(--space-6); }
.page-header h1 { margin-bottom: var(--space-3); }
.page-header p { max-width: 820px; color: var(--color-neutral-600); }

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0b2239, var(--color-primary));
  color: var(--color-white);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-8);
  align-items: center;
  padding: var(--space-20) 0;
}

.hero h1 {
  color: var(--color-white);
  font-size: 48px;
  line-height: 1.2;
}

.hero p {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 18px;
}

.hero-actions,
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-trust { margin-top: var(--space-6); }

.hero-trust span {
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-pill);
  font-size: 13px;
}

.hero-art {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
}

.article-content {
  max-width: 800px;
  line-height: 1.8;
}

.article-content h2 {
  margin-top: var(--space-12);
  padding-left: var(--space-3);
  border-left: 4px solid var(--color-primary);
}

.article-content h3 { margin-top: var(--space-8); }

.article-content pre {
  overflow: auto;
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-neutral-100);
}

.article-content blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4);
  border-left: 4px solid var(--color-primary);
  background: var(--color-neutral-50);
}

.author-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-4) 0 var(--space-6);
  color: var(--color-neutral-600);
  font-size: 14px;
}

.author-bar img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.model-hero {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-8);
  align-items: start;
  padding: var(--space-8) 0;
}

.model-gallery {
  padding: var(--space-6);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.model-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-2) 0 var(--space-4);
}

.model-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.news-banner {
  padding: var(--space-16) 0;
  background: linear-gradient(135deg, #0b2239, var(--color-primary));
  color: var(--color-white);
}

.news-banner h1 {
  max-width: 900px;
  color: var(--color-white);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.news-meta { color: rgba(255, 255, 255, 0.85); font-size: 14px; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.stat {
  padding: var(--space-4);
  border: var(--border);
  border-radius: var(--radius-md);
  background: var(--color-white);
  text-align: center;
}

.stat strong {
  display: block;
  color: var(--color-primary);
  font-size: 28px;
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--color-neutral-200);
}

.timeline li {
  position: relative;
  padding: 0 0 var(--space-6) var(--space-6);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

.timeline .year { font-weight: 700; color: var(--color-primary); }

.doc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.breadcrumb + .page-header { padding-top: 0; }

@media (max-width: 999px) {
  .grid-3,
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .hero-inner { grid-template-columns: 1fr; padding: var(--space-12) 0; }
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 16px; }
  .model-hero { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .doc-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
}


/* ==========================================================================
   阶段四审查修复（Critical / Important / Minor）
   ========================================================================== */

.layout-sidebar > *,
.layout-content-sidebar > * { min-width: 0; }

.table-wrap { max-width: 100%; }

.trust-strip {
  padding: var(--space-6) 0;
  background: var(--color-neutral-50);
  border-top: 1px solid var(--color-neutral-200);
  border-bottom: 1px solid var(--color-neutral-200);
}
.trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}
.trust-list span {
  padding: 8px 16px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-pill);
  background: var(--color-white);
  color: var(--color-neutral-800);
  font-size: 14px;
}

.model-thumbs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.model-thumb {
  padding: 4px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  cursor: pointer;
}
.model-thumb.is-active { border-color: var(--color-primary); }
.model-thumb img,
.model-thumb svg { width: 100%; height: 64px; object-fit: contain; }

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: var(--space-3);
  color: var(--color-neutral-600);
  font-size: 14px;
}
.form-check input { margin-top: 3px; }

/* 对比度：橙色 CTA 使用深色文字，满足 AA */
.btn-primary,
.header-cta { color: #212529; }
.btn-primary:hover,
.header-cta:hover { color: #212529; }

.badge-stock-in { color: #0f6b3a; background: #e6f4ec; }
.badge-stock-inquiry { color: #8a4b00; background: #fdebd8; }

/* 整卡可点击 */
.card { position: relative; }
.card-link::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
}
.card-link { position: relative; z-index: 2; }

/* 无 JS 时移动导航可见（移动端） */
.nav-toggle { touch-action: manipulation; }