/* ============================================================
   深圳市创一高科技有限公司 - 官网样式 v2.0
   深色重科技风 | 银灰金属质感 | 移动优先
   ============================================================ */

/* ========== CSS 变量 ========== */
:root {
  /* 深色背景系统 */
  --color-bg-deep: #08080e;
  --color-bg-primary: #0c0c14;
  --color-bg-secondary: #101018;
  --color-bg-card: #14141f;
  --color-bg-card-hover: #1a1a2a;
  --color-bg-card-alt: #161625;
  --color-bg-overlay: rgba(8, 8, 14, 0.85);

  /* 金属色系 */
  --color-metal-bright: #c8d0dc;
  --color-metal: #a0a8b8;
  --color-metal-dim: #7a8294;
  --color-metal-dark: #5a6272;

  /* 强调色 */
  --color-accent: #5b9cf5;
  --color-accent-light: #8ab9f8;
  --color-accent-dark: #3a7ad4;
  --color-accent-glow: rgba(91, 156, 245, 0.25);

  /* 边框 */
  --color-border: #1e1e30;
  --color-border-light: #2a2a40;
  --color-border-metal: rgba(160, 168, 184, 0.15);

  /* 文字 */
  --color-text-primary: #e4e8f0;
  --color-text-secondary: #a8b0c0;
  --color-text-muted: #6a7284;

  /* 辅助色 */
  --color-success: #4ade80;
  --color-warning: #f59e0b;
  --color-error: #f87171;

  /* 渐变 */
  --gradient-hero: linear-gradient(160deg, #08080e 0%, #0f1220 40%, #0d1a30 100%);
  --gradient-card: linear-gradient(145deg, #14141f 0%, #1a1a2e 100%);
  --gradient-card-hover: linear-gradient(145deg, #1a1a2e 0%, #202038 100%);
  --gradient-metal: linear-gradient(180deg, rgba(200, 208, 220, 0.08) 0%, rgba(160, 168, 184, 0.03) 100%);
  --gradient-btn: linear-gradient(135deg, #2a5a9a 0%, #1a3a6a 100%);
  --gradient-btn-hover: linear-gradient(135deg, #3a6ab0 0%, #2a4a80 100%);
  --gradient-section: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-bg-primary) 100%);

  /* 阴影 */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(160, 168, 184, 0.06);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(91, 156, 245, 0.2);
  --shadow-nav: 0 2px 16px rgba(0, 0, 0, 0.5);
  --shadow-btn-hover: 0 4px 20px rgba(91, 156, 245, 0.3);
  --shadow-glow: 0 0 30px rgba(91, 156, 245, 0.15);

  /* 字体 */
  --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-en: "Inter", "Roboto", "Helvetica Neue", sans-serif;

  /* 字号 */
  --text-h1: 28px;
  --text-h2: 24px;
  --text-h3: 18px;
  --text-h4: 17px;
  --text-body-l: 16px;
  --text-body: 14px;
  --text-body-s: 13px;
  --text-caption: 12px;

  /* 行高 */
  --leading-h1: 1.2;
  --leading-h2: 1.3;
  --leading-h3: 1.4;
  --leading-body: 1.7;
  --leading-body-s: 1.6;

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 80px;

  /* 圆角 */
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 6px;
  --radius-xs: 4px;

  /* 过渡 */
  --transition-fast: all 0.2s ease;
  --transition-base: all 0.3s ease;
  --transition-slow: all 0.5s ease;

  /* 布局 */
  --max-width: 1200px;
  --navbar-height: 56px;
  --navbar-height-desktop: 72px;
}

/* ========== 响应式字号 ========== */
@media (min-width: 768px) {
  :root {
    --text-h1: 36px;
    --text-h2: 28px;
    --text-h3: 20px;
    --text-h4: 18px;
    --text-body-l: 16px;
    --text-body: 15px;
    --text-body-s: 14px;
  }
}

@media (min-width: 1024px) {
  :root {
    --text-h1: 48px;
    --text-h2: 36px;
    --text-h3: 24px;
    --text-h4: 20px;
    --text-body-l: 18px;
    --text-body: 16px;
    --text-body-s: 14px;
    --navbar-height: 72px;
  }
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-cn);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  background: var(--color-bg-deep);
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--color-accent-light);
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .container {
    padding: 0 40px;
  }
}

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

/* ========== 全局背景网格纹理 ========== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(160, 168, 184, 0.015) 2px, rgba(160, 168, 184, 0.015) 3px),
    repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(160, 168, 184, 0.015) 2px, rgba(160, 168, 184, 0.015) 3px);
  pointer-events: none;
  z-index: 0;
}

/* ========== Section Common ========== */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding: var(--spacing-4xl) 0;
  }
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: var(--leading-h2);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 1px;
}

.section-header p {
  font-size: var(--text-body-l);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* 章节标题装饰线 */
.section-header h2::after {
  content: '';
  display: block;
  width: 50px;
  height: 2px;
  margin: var(--spacing-md) auto 0;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  border-radius: 1px;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: var(--text-body);
  font-weight: 600;
  font-family: var(--font-cn);
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-base);
  border: none;
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.btn-primary {
  background: var(--gradient-btn);
  color: var(--color-text-primary);
  border: 1px solid rgba(91, 156, 245, 0.3);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-btn-hover);
  transform: translateY(-1px);
  border-color: rgba(91, 156, 245, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--color-metal);
  border: 1px solid rgba(160, 168, 184, 0.3);
}

.btn-outline:hover {
  background: rgba(160, 168, 184, 0.06);
  border-color: rgba(160, 168, 184, 0.5);
  color: var(--color-metal-bright);
}

.btn-white {
  background: var(--color-metal-bright);
  color: var(--color-bg-deep);
}

.btn-white:hover {
  background: var(--color-metal);
  color: var(--color-bg-primary);
}

.btn-sm {
  padding: 8px 20px;
  font-size: var(--text-body-s);
}

/* ========== Navbar ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(12, 12, 20, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  height: var(--navbar-height);
  transition: var(--transition-base);
  border-bottom: 1px solid var(--color-border);
}

.navbar.scrolled {
  box-shadow: var(--shadow-nav);
  border-bottom-color: var(--color-border-light);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-metal);
  border: 1px solid var(--color-border-metal);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-metal-bright);
  font-family: var(--font-en);
}

.navbar-logo .logo-text {
  display: flex;
  flex-direction: column;
}

.navbar-logo .logo-en {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-metal-bright);
  letter-spacing: 1.5px;
  line-height: 1.2;
}

.navbar-logo .logo-cn {
  font-size: 11px;
  color: var(--color-metal-dim);
  line-height: 1.2;
}

.nav-menu {
  display: none;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  display: block;
  padding: 8px 16px;
  color: var(--color-metal-dim);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-xs);
  transition: var(--transition-fast);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform 0.2s ease;
  border-radius: 1px;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-metal-bright);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  transform: scaleX(1);
}

/* 下拉菜单 */
.nav-dropdown {
  position: relative;
}

.nav-dropdown > a {
  padding-right: 28px;
}

.nav-dropdown > a::before {
  content: '▾';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--color-metal-dim);
  transition: transform 0.2s ease;
}

.nav-dropdown:hover > a::before {
  transform: translateY(-50%) rotate(180deg);
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: rgba(18, 20, 30, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(100, 108, 128, 0.2);
  border-radius: var(--radius-md);
  padding: 6px;
  z-index: 1000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.nav-dropdown:hover .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 10px 14px;
  color: var(--color-metal-dim);
  font-size: 14px;
  border-radius: var(--radius-xs);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.nav-dropdown-menu a::after {
  display: none;
}

.nav-dropdown-menu a:hover {
  color: var(--color-metal-bright);
  background: rgba(100, 108, 128, 0.1);
}

.lang-switch {
  display: none;
  font-size: 13px;
  color: var(--color-metal-dim);
  cursor: pointer;
  padding: 4px 10px;
  border: 1px solid var(--color-border-metal);
  border-radius: var(--radius-xs);
  transition: var(--transition-fast);
  font-family: var(--font-en);
}

.lang-switch:hover {
  color: var(--color-metal-bright);
  border-color: rgba(160, 168, 184, 0.4);
}

/* Mobile menu toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-metal);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(8, 8, 14, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  padding: var(--spacing-xl) 20px;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  display: block;
  padding: 14px 16px;
  color: var(--color-metal-dim);
  font-size: 17px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  background: rgba(160, 168, 184, 0.06);
  color: var(--color-metal-bright);
}

.mobile-menu .lang-switch-mobile {
  margin-top: var(--spacing-lg);
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-metal-dim);
  border: 1px solid var(--color-border-metal);
  border-radius: var(--radius-xs);
  text-align: center;
  font-family: var(--font-en);
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }

  .lang-switch {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-menu {
    display: none !important;
  }
}

/* ========== Hero / Banner (轮播版) ========== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  max-height: 900px;
  display: flex;
  align-items: center;
  background: var(--color-bg-deep);
  overflow: hidden;
}

/* 背景网格 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(91, 156, 245, 0.02) 40px, rgba(91, 156, 245, 0.02) 41px),
    repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(91, 156, 245, 0.02) 40px, rgba(91, 156, 245, 0.02) 41px);
  pointer-events: none;
  z-index: 1;
}

/* 底部光晕 */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--color-bg-secondary), transparent);
  pointer-events: none;
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
  padding-top: 40px;
  padding-bottom: 80px;
}

/* 公司品牌居中覆盖层 */
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  pointer-events: none;
}

.hero-overlay > * {
  pointer-events: auto;
}

.hero-brand {
  max-width: 800px;
  animation: heroFadeIn 1s ease-out;
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-company-name {
  font-family: var(--font-en);
  font-size: clamp(32px, 6vw, 72px);
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: 6px;
  line-height: 1.1;
  margin-bottom: 8px;
  text-shadow: 0 0 60px rgba(91, 156, 245, 0.3), 0 4px 20px rgba(0,0,0,0.5);
}

.hero-company-cn {
  font-size: clamp(16px, 2.5vw, 24px);
  font-weight: 500;
  color: var(--color-metal);
  letter-spacing: 4px;
  margin-bottom: 20px;
}

.hero-divider {
  width: 60px;
  height: 2px;
  margin: 0 auto 20px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  border-radius: 1px;
}

.hero-company-desc {
  font-size: clamp(14px, 1.8vw, 18px);
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  letter-spacing: 2px;
}

.hero-company-tagline {
  font-size: clamp(12px, 1.4vw, 14px);
  color: var(--color-text-muted);
  letter-spacing: 1px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

/* 保留旧样式兼容 */
.hero-content {
  max-width: 600px;
}

.hero-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent-light);
  letter-spacing: 2.5px;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
  padding: 5px 14px;
  border: 1px solid rgba(91, 156, 245, 0.25);
  border-radius: 20px;
  background: rgba(91, 156, 245, 0.05);
}

.hero h1 {
  font-size: var(--text-h1);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: var(--leading-h1);
  margin-bottom: var(--spacing-md);
}

.hero h1 span {
  display: block;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-metal-bright));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--text-body-l);
  color: var(--color-text-muted);
  line-height: var(--leading-body);
  margin-bottom: var(--spacing-xl);
  max-width: 480px;
}

/* 全屏轮播背景 */
.hero-carousel {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

/* 轮播遮罩层 */
.hero-carousel::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(8, 8, 14, 0.75) 0%,
    rgba(8, 8, 14, 0.45) 35%,
    rgba(8, 8, 14, 0.35) 65%,
    rgba(8, 8, 14, 0.7) 100%
  );
  z-index: 1;
  pointer-events: none;
}

.carousel-track {
  display: flex;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.carousel-slide {
  min-width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

.carousel-slide img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.6) saturate(0.9);
}

.carousel-slide .slide-label {
  position: relative;
  z-index: 2;
  margin-top: 0;
  font-size: var(--text-body-s);
  color: var(--color-metal);
  font-weight: 500;
  letter-spacing: 1px;
  text-align: center;
  padding: 6px 16px;
  background: rgba(8, 8, 14, 0.55);
  border-radius: 20px;
  backdrop-filter: blur(4px);
}

/* 轮播指示器 */
.carousel-indicators {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-metal-dark);
  border: 1px solid var(--color-border-metal);
  cursor: pointer;
  transition: var(--transition-fast);
}

.carousel-dot.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-glow);
}

/* 轮播箭头 */
.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(20, 20, 31, 0.7);
  border: 1px solid var(--color-border-metal);
  color: var(--color-metal);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  z-index: 2;
  opacity: 0;
}

.hero-carousel:hover .carousel-arrow {
  opacity: 1;
}

.carousel-arrow:hover {
  background: rgba(30, 30, 50, 0.9);
  color: var(--color-metal-bright);
  border-color: var(--color-accent);
}

.carousel-arrow.prev {
  left: 16px;
}

.carousel-arrow.next {
  right: 16px;
}

@media (max-width: 767px) {
  .hero-overlay {
    padding: 60px 20px 80px;
  }
}

/* ========== About Section ========== */
.about-section {
  background: var(--color-bg-secondary);
  position: relative;
}

.about-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-light), transparent);
}

.about-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.about-text h2 {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.about-text p {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  line-height: var(--leading-body);
  margin-bottom: var(--spacing-md);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition-base);
}

.stat-item:hover {
  background: var(--gradient-card-hover);
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.stat-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-en);
  line-height: 1.2;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 300px;
}

@media (min-width: 768px) {
  .about-grid {
    flex-direction: row;
    align-items: center;
  }

  .about-text {
    flex: 0 0 50%;
  }

  .about-image {
    flex: 0 0 50%;
  }

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .stat-number {
    font-size: 36px;
  }
}

/* ========== Advantages Section ========== */
.advantages-section {
  background: var(--color-bg-primary);
}

.advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.advantage-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  transition: var(--transition-base);
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.advantage-card:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
  background: var(--gradient-card-hover);
}

.advantage-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--gradient-metal);
  border: 1px solid var(--color-border-metal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--color-accent);
}

.advantage-content h4 {
  font-size: var(--text-h4);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.advantage-content p {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  line-height: var(--leading-body);
}

@media (min-width: 768px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========== Products Nav Section ========== */
.products-nav-section {
  background: var(--color-bg-secondary);
}

.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.product-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
  transition: var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.product-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
  background: var(--gradient-card-hover);
}

.product-card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background: var(--gradient-metal);
  border: 1px solid var(--color-border-metal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--color-accent);
}

.product-card h4 {
  font-size: var(--text-h4);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.product-card p {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.product-card .card-link {
  font-size: var(--text-body-s);
  color: var(--color-accent);
  font-weight: 500;
}

.product-card:hover .card-link {
  color: var(--color-accent-light);
}

@media (min-width: 480px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========== Industries Section ========== */
.industries-section {
  background: var(--color-bg-primary);
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.industry-item {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition-base);
}

.industry-item:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.industry-icon {
  font-size: 36px;
  margin-bottom: var(--spacing-sm);
}

.industry-item h4 {
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.industry-item p {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .industries-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .industries-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ========== Contact Section ========== */
.contact-section {
  background: var(--color-bg-secondary);
}

.contact-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.contact-info-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--gradient-metal);
  border: 1px solid var(--color-border-metal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--color-accent);
}

.contact-info-text h4 {
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.contact-info-text p {
  font-size: var(--text-body-s);
  color: var(--color-text-secondary);
}

.contact-form {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.contact-form h3 {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: var(--text-body-s);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: var(--text-body);
  font-family: var(--font-cn);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  transition: var(--transition-fast);
  outline: none;
  color: var(--color-text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 480px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .contact-grid {
    flex-direction: row;
  }

  .contact-info {
    flex: 0 0 40%;
  }

  .contact-form {
    flex: 0 0 60%;
  }
}

/* ========== CTA Section ========== */
.cta-section {
  background: var(--gradient-hero);
  text-align: center;
  padding: var(--spacing-3xl) 0;
  position: relative;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .cta-section {
    padding: var(--spacing-4xl) 0;
  }
}

.cta-section h2 {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.cta-section p {
  font-size: var(--text-body-l);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== Footer ========== */
.footer {
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--spacing-sm);
}

.footer-brand .footer-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-metal);
  border: 1px solid var(--color-border-metal);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-metal-bright);
  font-family: var(--font-en);
}

.footer-brand .footer-logo .logo-en {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-metal-bright);
  letter-spacing: 1px;
}

.footer-brand p {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  line-height: var(--leading-body);
  max-width: 300px;
}

.footer-links h4 {
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  display: block;
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  padding: 4px 0;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-metal-bright);
}

.footer-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-bottom: var(--spacing-md);
}

.footer-bottom {
  text-align: center;
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

.footer-bottom p {
  margin-bottom: 4px;
}

@media (min-width: 768px) {
  .footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
  }

  .footer-grid {
    flex-direction: row;
    justify-content: space-between;
  }

  .footer-brand {
    flex: 0 0 35%;
  }
}

/* ========== Page Hero ========== */
.page-hero {
  background: var(--gradient-hero);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .page-hero {
    padding: 80px 0 var(--spacing-3xl);
  }
}

.breadcrumb {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

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

.breadcrumb span {
  margin: 0 6px;
  color: var(--color-border-light);
}

.page-hero h1 {
  font-size: var(--text-h1);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 1px;
}

.page-hero p {
  font-size: var(--text-body-l);
  color: var(--color-text-muted);
}

/* 下拉快速导航 */
.product-quick-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--spacing-lg);
  padding: 8px 16px;
  background: rgba(20, 20, 31, 0.6);
  border: 1px solid var(--color-border-metal);
  border-radius: var(--radius-sm);
}

.quick-nav-label {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.quick-nav-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--color-bg-card);
  color: var(--color-metal-bright);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  padding: 8px 36px 8px 14px;
  font-size: var(--text-body);
  font-family: var(--font-cn);
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23a0a8b8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: var(--transition-fast);
  min-width: 180px;
}

.quick-nav-select:hover {
  border-color: var(--color-accent);
}

.quick-nav-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-glow);
}

.quick-nav-select option {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  padding: 8px;
}

/* ========== Product Detail Block ========== */
.product-detail {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

@media (min-width: 768px) {
  .product-detail {
    padding: var(--spacing-4xl) 0;
  }
}

.product-detail:nth-child(even) {
  background: var(--color-bg-primary);
}

.product-detail:nth-child(odd) {
  background: var(--color-bg-secondary);
}

.product-detail-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.product-detail-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
}

.product-detail-image .placeholder-img {
  width: 100%;
  height: 100%;
  min-height: 250px;
  background: var(--gradient-metal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--color-accent);
}

.product-detail-content h2 {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.product-detail-content .intro {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  line-height: var(--leading-body);
  margin-bottom: var(--spacing-lg);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin-bottom: var(--spacing-lg);
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  line-height: var(--leading-body);
}

.feature-list li .check-icon {
  flex-shrink: 0;
  color: var(--color-success);
  font-weight: 700;
  margin-top: 2px;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.product-tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: var(--text-body-s);
  color: var(--color-accent);
  background: rgba(91, 156, 245, 0.08);
  border: 1px solid rgba(91, 156, 245, 0.15);
  border-radius: 20px;
  font-weight: 500;
}

@media (min-width: 768px) {
  .product-detail-grid {
    flex-direction: row;
    align-items: center;
  }

  .product-detail-grid.reverse {
    flex-direction: row-reverse;
  }

  .product-detail-image {
    flex: 0 0 45%;
  }

  .product-detail-content {
    flex: 0 0 55%;
  }
}

/* ========== Process Table ========== */
.process-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.process-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-body-s);
  min-width: 600px;
}

.process-table thead {
  background: var(--gradient-card);
  border-bottom: 1px solid var(--color-border-light);
}

.process-table th {
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  font-size: var(--text-body-s);
  color: var(--color-metal-bright);
  white-space: nowrap;
}

.process-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.process-table tbody tr {
  background: var(--color-bg-card);
  transition: var(--transition-fast);
}

.process-table tbody tr:nth-child(even) {
  background: var(--color-bg-card-alt);
}

.process-table tbody tr:hover {
  background: var(--color-bg-card-hover);
}

@media (max-width: 767px) {
  .process-table-wrapper {
    border: none;
  }

  .process-table {
    min-width: 100%;
  }

  .process-table thead {
    display: none;
  }

  .process-table tbody tr {
    display: block;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
  }

  .process-table td {
    display: block;
    padding: 6px 0;
    border: none;
  }

  .process-table td::before {
    content: attr(data-label);
    display: block;
    font-weight: 600;
    font-size: var(--text-caption);
    color: var(--color-accent);
    margin-bottom: 2px;
  }
}

/* ========== Scroll to Top ========== */
.scroll-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--gradient-card);
  color: var(--color-metal);
  border: 1px solid var(--color-border-metal);
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition-base);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background: var(--gradient-card-hover);
  color: var(--color-metal-bright);
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

/* ========== Animations ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Utility ========== */
.text-center { text-align: center; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}
/* ========== Product Card Grid (产品卡片页) ========== */
.product-cards-section {
  background: var(--color-bg-secondary);
  padding: var(--spacing-3xl) 0;
}

@media (min-width: 768px) {
  .product-cards-section {
    padding: var(--spacing-4xl) 0;
  }
}

/* ========== 产品选项卡 ========== */
.product-tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: var(--spacing-2xl);
  border-bottom: 1px solid var(--color-border);
}

.tab-btn {
  position: relative;
  padding: 12px 32px;
  font-size: var(--text-body-l);
  font-weight: 600;
  font-family: var(--font-cn);
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
  letter-spacing: 1px;
}

.tab-btn::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform 0.2s ease;
  border-radius: 1px;
}

.tab-btn:hover {
  color: var(--color-metal-bright);
}

.tab-btn.active {
  color: var(--color-accent-light);
}

.tab-btn.active::after {
  transform: scaleX(1);
}

/* 选项卡内容 */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

@media (max-width: 767px) {
  .tab-btn {
    padding: 10px 20px;
    font-size: var(--text-body);
  }
}

/* 分类子标题 */
.product-sub-header {
  margin: var(--spacing-2xl) 0 var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.product-sub-header h3 {
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-text-primary);
  display: inline-block;
  position: relative;
}

.product-sub-header h3::after {
  content: '';
  position: absolute;
  bottom: -9px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.product-sub-header .sub-count {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  margin-left: var(--spacing-sm);
  font-weight: 400;
}

/* 产品卡片网格 */
.product-cards-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* 单个产品卡片 */
.product-item-card {
  display: flex;
  flex-direction: column;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-base);
  position: relative;
}

.product-item-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  opacity: 0;
  transition: opacity 0.4s ease;
  box-shadow: 0 0 30px rgba(91, 156, 245, 0.12), 0 0 60px rgba(91, 156, 245, 0.05);
  pointer-events: none;
}

.product-item-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  background: var(--gradient-card-hover);
}

.product-item-card:hover::before {
  opacity: 1;
}

/* 卡片图片区 */
.product-item-card .card-img {
  flex-shrink: 0;
  background: var(--color-bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  min-height: 200px;
}

.product-item-card .card-img img {
  max-height: 200px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(91, 156, 245, 0.15));
  transition: transform 0.4s ease;
}

.product-item-card:hover .card-img img {
  transform: scale(1.05);
}

.product-item-card .card-img .placeholder-icon {
  font-size: 64px;
  opacity: 0.3;
}

/* 卡片文字区 */
.product-item-card .card-body {
  flex: 1;
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.product-item-card .card-body .card-name {
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
}

.product-item-card .card-body .card-tagline {
  font-size: var(--text-body);
  color: var(--color-accent);
  font-weight: 500;
  line-height: 1.5;
  padding: var(--spacing-xs) 0;
  border-left: 3px solid var(--color-accent);
  padding-left: var(--spacing-md);
}

.product-item-card .card-body .card-desc {
  font-size: var(--text-body-s);
  color: var(--color-text-secondary);
  line-height: var(--leading-body);
}

.product-item-card .card-body .card-features {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.product-item-card .card-body .card-features li {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  background: rgba(91, 156, 245, 0.06);
  border: 1px solid rgba(91, 156, 245, 0.1);
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

/* 卡片内规格表 */
.product-item-card .card-body .card-specs {
  margin-top: var(--spacing-sm);
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-caption);
}

.product-item-card .card-body .card-specs tr {
  border-bottom: 1px solid var(--color-border);
}

.product-item-card .card-body .card-specs tr:last-child {
  border-bottom: none;
}

.product-item-card .card-body .card-specs td {
  padding: 4px 0;
  color: var(--color-text-muted);
  vertical-align: top;
}

.product-item-card .card-body .card-specs td:first-child {
  color: var(--color-metal-dim);
  font-weight: 500;
  width: 100px;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .product-item-card {
    flex-direction: row;
  }

  .product-item-card .card-img {
    width: 280px;
    min-height: 240px;
    border-bottom: none;
    border-right: 1px solid var(--color-border);
  }

  .product-item-card .card-img img {
    max-height: 180px;
  }

  .product-item-card .card-body {
    padding: var(--spacing-xl);
  }
}

@media (min-width: 1024px) {
  .product-item-card .card-img {
    width: 320px;
    min-height: 280px;
  }

  .product-item-card .card-img img {
    max-height: 220px;
  }
}

/* 产品卡片交替背景 */
.product-item-card:nth-child(even) {
  background: var(--color-bg-card);
}

.product-item-card:nth-child(even):hover {
  background: var(--gradient-card-hover);
}

/* 占位卡片 */
.product-item-card.placeholder-card {
  border-style: dashed;
  border-color: var(--color-border-metal);
  opacity: 0.7;
}

.product-item-card.placeholder-card:hover {
  border-color: var(--color-accent);
  opacity: 0.9;
}

.product-item-card.placeholder-card .placeholder-icon {
  font-size: 72px;
  opacity: 0.4;
}