@layer base, components, utilities;

@layer base {
  html, body {
    background: var(--bg-default);
    color: var(--text-primary);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
  }
  body { padding-top: 52px; /* 适配更薄的导航栏：header-padding 8px */ } /* Compensate for fixed header */
  .hero--fullbleed { margin-left: calc(-1 * var(--space-16)); margin-right: calc(-1 * var(--space-16)); }
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-24) var(--space-16);
  }
  .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,1px,1px); white-space: nowrap; border: 0; }
}

@layer components {
/* Header */
.nl-header { position: fixed; top: 0; left: 0; right: 0; z-index: 20; background: rgba(255,255,255,0.9); -webkit-backdrop-filter: saturate(180%) blur(16px); backdrop-filter: saturate(180%) blur(16px); border-bottom: 1px solid var(--border-color); transition: background-color var(--duration-base) var(--ease-standard), border-color var(--duration-base) var(--ease-standard), backdrop-filter var(--duration-base) var(--ease-standard); }
.dark .nl-header { background: rgba(28,28,30,0.9); }
  .nl-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-16); padding: var(--header-padding) var(--space-16); }
  .nl-nav { display: flex; gap: var(--space-16); align-items: center; }
  .nl-nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--nav-font-size, var(--fs-caption));
    line-height: var(--nav-line-height, var(--lh-caption));
    letter-spacing: var(--nav-letter-spacing, 0);
    font-weight: var(--font-weight-medium);
    opacity: .9;
    transition: all var(--duration-base) var(--ease-standard);
  }
  .nl-nav a:hover { opacity: 1; }
  
  /* External link styles */
  .nav-external {
    display: flex !important;
    align-items: center;
    gap: 4px;
    position: relative;
  }
  
  .external-link-icon {
    opacity: 0.5;
    transition: all var(--duration-base) var(--ease-standard);
    transform: translateY(0);
  }
  
  .nav-external:hover .external-link-icon {
    opacity: 0.8;
    transform: translateY(-1px) scale(1.1);
  }
  
  /* Additional visual cue for external links */
  .nav-external::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--brand-500), transparent);
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-standard);
  }
  
  .nav-external:hover::after {
    opacity: 0.6;
  }
  .nl-header--overlay { background: transparent !important; border-bottom: none !important; -webkit-backdrop-filter: none !important; backdrop-filter: none !important; }
  /* Dark mode overlay styles only */
  .dark .nl-header--overlay .nl-nav a { color: var(--light-text-inverse) !important; opacity: .92; }
  .dark .nl-header--overlay .nl-nav a:hover { opacity: 1; }
  .dark .nl-header--overlay .nav-external .external-link-icon { color: var(--light-text-inverse) !important; }
  .dark .nl-header--overlay .brand-title { color: var(--light-text-inverse) !important; }
  .dark .nl-header--overlay .brand-title img:hover { opacity: 0.8; }
  .dark .nl-header--overlay .brand-title span:hover { opacity: 0.8; }
  .dark .nl-header--overlay .btn--nav { background: var(--brand-500) !important; color: var(--light-text-inverse) !important; }
  .dark .nl-header--overlay .theme-toggle, 
  .dark .nl-header--overlay .lang-toggle { color: var(--light-text-inverse) !important; }
  
  /* Light mode overlay: use dark text for better readability */
  html:not(.dark) .nl-header--overlay .nl-nav a { color: #000 !important; opacity: .92; }
  html:not(.dark) .nl-header--overlay .nl-nav a:hover { opacity: 1; }
  html:not(.dark) .nl-header--overlay .nav-external .external-link-icon { color: #000 !important; }
  html:not(.dark) .nl-header--overlay .brand-title { color: #000 !important; }
  html:not(.dark) .nl-header--overlay .brand-title img:hover { opacity: 0.8; }
  html:not(.dark) .nl-header--overlay .brand-title span:hover { opacity: 0.8; }
  html:not(.dark) .nl-header--overlay .btn--nav { background: var(--brand-500) !important; color: #000 !important; }
  html:not(.dark) .nl-header--overlay .theme-toggle, 
  html:not(.dark) .nl-header--overlay .lang-toggle { color: #000 !important; }
  .nl-header--overlay .btn--primary { box-shadow: 0 8px 20px rgba(0,110,219,0.35); }
  .brand-title { 
    color: var(--text-primary); 
    font-size: 20px; 
    font-weight: 600; 
    letter-spacing: -0.02em; 
    line-height: 36px;
    transition: color var(--duration-base) var(--ease-standard); 
  }
  
  /* Logo和文字的独立hover效果 */
  .brand-title img { 
    transition: opacity var(--duration-base) var(--ease-standard); 
  }
  .brand-title img:hover { 
    opacity: 0.8; 
  }
  
  .brand-title span { 
    transition: opacity var(--duration-base) var(--ease-standard); 
  }
  .brand-title span:hover { 
    opacity: 0.8; 
  }

  /* Buttons - Apple .button-elevated Style */
  .btn { 
    appearance: none; 
    border: none; 
    cursor: pointer; 
    /* Apple Typography Standards */
    font-family: var(--font-sans);
    font-size: var(--fs-button); 
    font-weight: var(--font-weight-regular); 
    line-height: var(--lh-button); 
    letter-spacing: var(--btn-letter-spacing);
    /* Apple Button Shape */
    border-radius: var(--btn-radius); 
    padding: var(--btn-padding-y) var(--btn-padding-x); 
    text-decoration: none; 
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--btn-min-height);
    /* Smooth Transitions */
    transition: all var(--duration-button) var(--ease-apple); 
  }
  
  /* Primary Button */
  .btn--primary { 
    background: var(--brand-500); 
    color: var(--text-inverse); 
    box-shadow: 0 4px 14px 0 rgba(0,110,219,0.25); 
  }
  .btn--primary:hover { 
    background: var(--brand-600); 
    transform: translateY(-1px); 
    box-shadow: 0 6px 20px 0 rgba(0,110,219,0.35); 
  }
  .btn--primary:active { 
    background: var(--brand-700); 
    transform: translateY(0) scale(0.98); 
    box-shadow: 0 2px 8px 0 rgba(0,110,219,0.4); 
    transition-duration: 0.1s;
  }
  
  /* Secondary Button (Ghost) */
  .btn--secondary { 
    background: transparent; 
    color: var(--text-primary); 
    border: 1px solid var(--border-color); 
  }
  .btn--secondary:hover { 
    background: var(--bg-elevated); 
    border-color: var(--brand-500);
    color: var(--brand-600);
  }
  .btn--secondary:active { 
    background: var(--brand-50); 
    transform: scale(0.98); 
    transition-duration: 0.1s;
  }
  
  /* Disabled Button */
  .btn:disabled,
  .btn--disabled { 
    background: var(--neutral-100); 
    color: var(--neutral-400); 
    cursor: not-allowed; 
    box-shadow: none;
    opacity: 0.6;
  }
  .btn:disabled:hover,
  .btn--disabled:hover { 
    transform: none; 
    box-shadow: none; 
  }
  
  /* Legacy Ghost Support (将逐步替换为Secondary) */
  .btn--ghost { 
    background: transparent; 
    color: var(--text-primary); 
    border: 1px solid var(--border-color); 
  }
  .btn--ghost:hover { 
    background: var(--brand-500); 
    color: var(--text-inverse); 
    border-color: var(--brand-500); 
  }
  
  /* 导航栏专用按钮 */
  .btn--nav { 
    font-size: var(--btn-nav-font-size);
    font-weight: var(--font-weight-medium);
    line-height: 1.2;
    letter-spacing: -0.01em;
    border-radius: var(--btn-nav-radius);
    padding: var(--btn-nav-padding-y) var(--btn-nav-padding-x);
    min-height: var(--btn-nav-min-height);
    background: var(--brand-500);
    color: var(--text-inverse);
    box-shadow: 0 4px 14px 0 rgba(0,110,219,0.25);
  }
  .btn--nav:hover { 
    background: var(--brand-600);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px 0 rgba(0,110,219,0.35);
  }
  .btn--nav:active { 
    background: var(--brand-700);
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px 0 rgba(0,110,219,0.4);
    transition-duration: 0.1s;
  }

  /* Hero */
  .hero { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: var(--space-32); padding: var(--space-64) var(--space-16); }
  .hero--visual { grid-template-columns: 1fr; text-align: center; }
  .hero--fullbleed { position: relative; display: block; padding: 0; min-height: 100vh; width: 100vw; left: 0; margin-left: 0; margin-top: -52px; padding-top: 52px; }
  .hero--fullbleed .hero__bg { position: absolute; inset: 0; z-index: 0; }
  /* Top gradient overlay for better header contrast; starts at 25% height transparent, fades to themed header color at top */
  .hero--fullbleed::before {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 0; height: 50vh; /* enough height to cover upper quarter and smooth fade */
    pointer-events: none;
    z-index: 1;
    background: linear-gradient(
      to top,
      rgba(var(--header-overlay-rgb), 0) 25%,
      rgba(var(--header-overlay-rgb), 0.28) 55%,
      rgba(var(--header-overlay-rgb), 0.44) 80%,
      rgba(var(--header-overlay-rgb), 0.56) 100%
    );
  }
  
  /* Content area overlay - radial gradient for better text readability */
  .hero--fullbleed .hero__bg::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background: radial-gradient(
      ellipse 75% 65% at center 42%,
      rgba(0, 0, 0, 0.20) 0%,
      rgba(0, 0, 0, 0.40) 60%,
      rgba(0, 0, 0, 0.55) 100%
    );
  }
  
  /* Enhance content area overlay in dark mode */
  .dark .hero--fullbleed .hero__bg::after {
    background: radial-gradient(
      ellipse 75% 65% at center 42%,
      rgba(0, 0, 0, 0.30) 0%,
      rgba(0, 0, 0, 0.50) 60%,
      rgba(0, 0, 0, 0.65) 100%
    );
  }
  
  /* ensure text overlay above gradient */
  .hero--fullbleed .hero__overlay { position: relative; z-index: 2; }
  .hero--fullbleed .hero__bg img { width: 100%; height: 100%; object-fit: cover; display: block; }
  
  /* Hero carousel */
  .hero-carousel { position: absolute; inset: 0; overflow: hidden; }
  .hero-carousel .hero-slide { position: absolute; inset: 0; opacity: 0; transform: translate3d(2%,0,0); transition: opacity 600ms var(--ease-apple), transform 600ms var(--ease-apple); }
  .hero-carousel .hero-slide.is-active { opacity: 1; transform: translate3d(0,0,0); }
  .hero-carousel img { width: 100%; height: 100%; object-fit: cover; user-select: none; -webkit-user-select: none; -ms-user-select: none; -webkit-user-drag: none; pointer-events: none; }
  .hero--fullbleed .hero__overlay { position: relative; z-index: 1; padding-top: 20vh; padding-bottom: 12vh; }
  .hero--fullbleed .hero__overlay .hero__title, .hero--fullbleed .hero__overlay .hero__subtitle { color: var(--text-inverse); }
  
  /* Enhanced text shadows for better readability on video backgrounds */
  .hero--fullbleed .hero__title {
    font-weight: 600;
    letter-spacing: -0.03em;
    text-shadow: 
      0 2px 10px rgba(0, 0, 0, 0.55),
      0 4px 22px rgba(0, 0, 0, 0.35),
      0 1px 4px rgba(0, 0, 0, 0.45);
  }
  
  .hero--fullbleed .hero__subtitle {
    text-shadow: 
      0 1px 8px rgba(0, 0, 0, 0.50),
      0 3px 14px rgba(0, 0, 0, 0.30),
      0 1px 3px rgba(0, 0, 0, 0.40);
    line-height: 1.65;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero__title { font-size: var(--fs-hero); letter-spacing: -0.02em; font-weight: var(--font-weight-semibold); line-height: var(--lh-hero); margin: 0; }
  .hero__subtitle { font-size: var(--fs-hero-sub); line-height: var(--lh-hero-sub); color: var(--text-secondary); margin-top: var(--space-12); }
  .hero__cta { display: inline-flex; gap: var(--space-12); margin-top: var(--space-20); }
  
  /* Enhanced button shadows in hero area for better visual hierarchy */
  .hero--fullbleed .hero__cta .btn {
    box-shadow: 
      0 4px 16px rgba(0, 0, 0, 0.40),
      0 2px 6px rgba(0, 0, 0, 0.30);
    backdrop-filter: blur(2px);
  }
  
  .hero--fullbleed .hero__cta .btn:hover {
    box-shadow: 
      0 6px 24px rgba(0, 0, 0, 0.45),
      0 3px 8px rgba(0, 0, 0, 0.35);
  }
  
  .hero__visual { width: 100%; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
  .hero__visual img { width: 100%; height: auto; display: block; }

  /* Breadcrumb Navigation - Minimal & Premium Style */
  .breadcrumb {
    background: transparent;
    position: relative;
    z-index: 10;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    transition: all var(--duration-base) var(--ease-standard);
    margin-top: var(--space-80); /* 略大于导航栏厚度（52px），使用 80px */
    margin-bottom: 0; /* 移除下边距，让 section 自己控制间距 */
  }
  
  /* 滚动后添加微妙背景 */
  .breadcrumb::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--bg-default);
    opacity: 0.85;
    transition: opacity var(--duration-base) var(--ease-standard);
  }
  
  .breadcrumb__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-16) var(--space-16);
    position: relative;
    z-index: 1;
  }
  
  .breadcrumb__list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    list-style: none;
    margin: 0;
    padding: 0;
  }
  
  .breadcrumb__item {
    display: flex;
    align-items: center;
    gap: var(--space-8);
  }
  
  .breadcrumb__link {
    color: var(--brand-500);
    text-decoration: none;
    font-size: var(--fs-small);
    font-weight: var(--font-weight-regular);
    letter-spacing: 0.01em;
    opacity: 0.75;
    transition: all var(--duration-fast) var(--ease-standard);
    display: inline-flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-xs);
  }
  
  .breadcrumb__link:hover {
    color: var(--brand-500);
    opacity: 1;
    background: var(--bg-elevated);
    transform: translateY(-1px);
  }
  
  .breadcrumb__link svg {
    width: 13px;
    height: 13px;
    opacity: 0.5;
    transition: opacity var(--duration-fast) var(--ease-standard);
  }
  
  .breadcrumb__link:hover svg {
    opacity: 0.8;
  }
  
  .breadcrumb__separator {
    color: var(--text-secondary);
    opacity: 0.4;
    user-select: none;
    font-size: 16px;
    font-weight: 400;
    line-height: 1;
    display: flex;
    align-items: center;
  }
  
  .breadcrumb__current {
    color: var(--brand-600);
    font-size: var(--fs-small);
    font-weight: var(--font-weight-semibold);
    padding: var(--space-4) var(--space-8);
    opacity: 1;
  }
  
  /* Dark mode adjustments */
  .dark .breadcrumb::before {
    background: var(--bg-default);
    opacity: 0.90;
  }
  
  .dark .breadcrumb__link {
    color: var(--brand-400);
    opacity: 0.75;
  }
  
  .dark .breadcrumb__link:hover {
    color: var(--brand-400);
    opacity: 1;
    background: var(--bg-elevated);
  }
  
  .dark .breadcrumb__current {
    color: var(--brand-400);
  }
  
  /* Mobile responsive */
  @media (max-width: 767px) {
    .breadcrumb {
      margin-top: var(--space-64); /* 移动端也保持较大间距 */
      margin-bottom: 0;
    }
    
    .breadcrumb__container {
      padding: var(--space-12) var(--space-16);
    }
    
    .breadcrumb__link,
    .breadcrumb__current {
      font-size: 11px;
      padding: var(--space-2) var(--space-4);
    }
    
    .breadcrumb__link svg {
      width: 11px;
      height: 11px;
    }
    
    .breadcrumb__separator {
      font-size: 14px;
    }
  }

  /* Section */
  .section { 
    padding: var(--space-64) var(--space-16);
  }
  .section__header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-16); margin-bottom: var(--space-24); }
  .section__title { font-size: var(--fs-secondary); font-weight: var(--font-weight-semibold); line-height: var(--lh-secondary); margin: 0; letter-spacing: -0.01em; }
  /* Hero区域始终使用固定背景，不受主题影响 */
  .hero--fullbleed { background: transparent; }
  .hero--fullbleed .hero__overlay { color: var(--light-text-inverse); }
  .hero--fullbleed .hero__title, 
  .hero--fullbleed .hero__subtitle { color: var(--light-text-inverse) !important; }
  /* Hero区域按钮特殊样式 - 仿照苹果官网 */
  .hero--fullbleed .btn--secondary,
  .hero--fullbleed .btn--ghost { 
    color: var(--brand-500) !important; 
    border-color: var(--brand-500) !important; 
    background: transparent !important;
  }
  .hero--fullbleed .btn--secondary:hover,
  .hero--fullbleed .btn--ghost:hover { 
    background: var(--brand-500) !important; 
    color: var(--light-text-inverse) !important; 
    border-color: var(--brand-500) !important; 
    transform: translateY(-1px) !important;
  }
  .hero--fullbleed .btn--secondary:active,
  .hero--fullbleed .btn--ghost:active { 
    background: var(--brand-600) !important; 
    color: var(--light-text-inverse) !important;
    transform: translateY(0) scale(0.98) !important; 
  }

  /* Product grid */
  .grid { display: grid; gap: var(--space-16); }
  .grid--12 { grid-template-columns: repeat(12, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
  .product-card { grid-column: span 4; background: var(--bg-default); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-xs); transition: transform var(--duration-base) var(--ease-standard), box-shadow var(--duration-base) var(--ease-standard); }
  .product-card__media { position: relative; overflow: hidden; aspect-ratio: 4/3; background: var(--neutral-50); }
  .product-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--duration-base) var(--ease-standard); }
  .product-card__body { padding: var(--space-16); }
  .product-card__title { font-size: var(--fs-card); line-height: var(--lh-card); font-weight: var(--font-weight-semibold); margin: 0 0 var(--space-8); }
  .product-card__desc { font-size: var(--fs-body); line-height: var(--lh-body); color: var(--text-secondary); margin: 0 0 var(--space-12); }
  .product-card__actions { display: flex; gap: var(--space-12); align-items: center; }
  .product-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
  .product-card:hover .product-card__media img { transform: scale(1.03); }
  .product-card__features { 
    margin: 0 0 var(--space-12); padding-left: 1.2em; color: var(--text-secondary); 
    font-size: var(--fs-body); line-height: var(--lh-body);
  }
  .product-card__features li { margin: 0 0 6px; }

  /* Footer - Modern Minimal Design */
  .nl-footer { 
    background: rgba(255,255,255,0.95); 
    -webkit-backdrop-filter: saturate(180%) blur(20px); 
    backdrop-filter: saturate(180%) blur(20px); 
    border-top: 1px solid var(--border-color); 
    margin-top: var(--space-64); 
    color: var(--text-secondary); 
  }
  .dark .nl-footer { background: rgba(28,28,30,0.95); }
  
  .nl-footer__inner { 
    display: grid; 
    grid-template-columns: 1fr auto auto; 
    gap: var(--space-48); 
    align-items: center;
    padding: var(--space-40) var(--space-16); 
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .nl-footer__brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
  }
  
  .nl-footer .brand-title { 
    font-size: 20px; 
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary); 
    display: flex;
    align-items: center;
    gap: var(--space-12);
    margin: 0;
  }
  .nl-footer .brand-title img { 
    height: 24px;
    opacity: 1; 
  }
  
  .nl-footer__slogan {
    font-size: var(--fs-caption);
    color: var(--text-secondary);
    margin: 0;
    font-weight: var(--font-weight-medium);
  }
  
  .nl-footer__nav {
    justify-self: center;
  }
  
  .nl-footer__links { 
    display: flex; 
    gap: var(--space-32); 
    align-items: center;
  }
  .nl-footer__links a { 
    color: var(--text-secondary); 
    text-decoration: none; 
    font-size: var(--fs-caption); 
    font-weight: var(--font-weight-medium);
    line-height: var(--lh-caption); 
    transition: color var(--duration-fast) var(--ease-standard);
  }
  .nl-footer__links a:hover { 
    color: var(--text-primary); 
  }
  
  .nl-footer__social {
    justify-self: end;
  }
  
  .nl-footer__meta { 
    background: var(--bg-elevated);
    border-top: 1px solid var(--border-color); 
    padding: var(--space-20) 0;
  }
  .nl-footer__meta .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-16);
  }
  .nl-footer__meta p {
    font-size: var(--fs-small); 
    line-height: var(--lh-small); 
    color: var(--text-secondary); 
    text-align: center;
    margin: 0;
  }

  /* Social icons - Modern Premium Design */
  .social { 
    display: flex; 
    gap: var(--space-16); 
    align-items: center; 
  }
  .social a { 
    display: inline-flex; 
    align-items: center; 
    justify-content: center; 
    width: 44px; 
    height: 44px; 
    border-radius: var(--radius-md);
    color: var(--text-secondary); 
    background: var(--bg-elevated);
    border: 1px solid transparent;
    transition: all var(--duration-base) var(--ease-standard);
    position: relative;
    overflow: hidden;
  }
  .social a svg { 
    width: 20px; 
    height: 20px; 
    transition: transform var(--duration-base) var(--ease-standard);
  }
  .social a:hover { 
    color: var(--text-primary);
    background: var(--bg-default);
    border-color: var(--border-color);
    transform: translateY(-2px); 
    box-shadow: var(--shadow-sm);
  }
  .social a:hover svg {
    transform: scale(1.1);
  }
  .social a:active {
    transform: translateY(0) scale(0.95);
    transition-duration: 0.1s;
  }
  
  /* Specific social platform colors on hover */
  .social a[aria-label*="Facebook"]:hover { 
    background: #1877f2; 
    color: white; 
    border-color: #1877f2;
  }
  .social a[aria-label*="YouTube"]:hover { 
    background: #ff0000; 
    color: white; 
    border-color: #ff0000;
  }
  .social a[aria-label*="抖音"]:hover { 
    background: #000000; 
    color: white; 
    border-color: #000000;
  }
  .social a[aria-label*="小红书"]:hover { 
    background: #ff2442; 
    color: white; 
    border-color: #ff2442;
  }
  
  /* Footer responsive design */
  @media (max-width: 1024px) {
    .nl-footer__inner {
      grid-template-columns: 1fr auto;
      gap: var(--space-32);
      padding: var(--space-32) var(--space-16);
    }
    .nl-footer__nav {
      grid-column: 1 / -1;
      justify-self: center;
      order: 3;
      margin-top: var(--space-16);
    }
    .nl-footer__links {
      gap: var(--space-24);
    }
  }
  
  @media (max-width: 768px) {
    .nl-footer__inner {
      grid-template-columns: 1fr;
      gap: var(--space-24);
      text-align: center;
      padding: var(--space-32) var(--space-16);
    }
    .nl-footer__brand,
    .nl-footer__nav,
    .nl-footer__social {
      justify-self: center;
    }
    .nl-footer__links {
      gap: var(--space-20);
      flex-wrap: wrap;
      justify-content: center;
    }
    .social {
      gap: var(--space-12);
      justify-content: center;
    }
    .social a {
      width: 40px;
      height: 40px;
    }
    .social a svg {
      width: 18px;
      height: 18px;
    }
  }
  
  @media (max-width: 480px) {
    .nl-footer__inner {
      padding: var(--space-24) var(--space-16);
    }
    .nl-footer__links {
      flex-direction: column;
      gap: var(--space-16);
    }
    .social {
      gap: var(--space-8);
    }
    .social a {
      width: 36px;
      height: 36px;
    }
    .social a svg {
      width: 16px;
      height: 16px;
    }
  }

  /* Article */
  .article { max-width: 720px; margin: 0 auto; padding: var(--space-32) var(--space-16); }
  .article h1 { font-size: var(--fs-40); margin: 0 0 var(--space-16); letter-spacing: -0.01em; }
  .article__meta { color: var(--text-secondary); font-size: var(--fs-14); margin-bottom: var(--space-24); }
  .article__cover { aspect-ratio: 16/9; background: var(--neutral-50); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); }
  .article__cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
  .article p { font-size: var(--fs-16); line-height: 1.75; color: var(--text-primary); margin: 0 0 var(--space-16); }

  /* Icons (Notion-like minimal stroke) */
  .icon { width: 18px; height: 18px; display: inline-block; vertical-align: -3px; }
  .icon svg { width: 100%; height: 100%; stroke: currentColor; stroke-width: 1.8; fill: none; stroke-linecap: round; stroke-linejoin: round; }
}

@layer utilities {
  .container--narrow { max-width: 960px; }
  .text-center { text-align: center; }
  .muted { color: var(--text-secondary); }
  .tag { display: inline-block; padding: 4px 10px; border-radius: var(--radius-pill); background: var(--brand-50); color: var(--brand-600); font-size: var(--fs-12); }
}

@media (max-width: 1199px) {
  .hero { grid-template-columns: 1fr; text-align: center; }
}

@media (max-width: 767px) {
  .grid--12 { grid-template-columns: repeat(4, 1fr); }
  .product-card, .blog-card { grid-column: span 4; }
  
  /* Enhanced overlay for mobile hero areas */
  .hero--fullbleed .hero__bg::after {
    background: radial-gradient(
      ellipse 85% 70% at center 40%,
      rgba(0, 0, 0, 0.30) 0%,
      rgba(0, 0, 0, 0.50) 55%,
      rgba(0, 0, 0, 0.65) 100%
    );
  }
  
  .dark .hero--fullbleed .hero__bg::after {
    background: radial-gradient(
      ellipse 85% 70% at center 40%,
      rgba(0, 0, 0, 0.40) 0%,
      rgba(0, 0, 0, 0.60) 55%,
      rgba(0, 0, 0, 0.75) 100%
    );
  }
  
  /* Mobile text optimization */
  .hero--fullbleed .hero__title {
    font-size: 2rem;
    line-height: 1.15;
  }
  
  .hero--fullbleed .hero__subtitle {
    font-size: 0.95rem;
    line-height: 1.6;
    padding: 0 var(--space-8);
  }
}

/* Notion-like Feature Tiles */
.feature-tiles { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-16); }
  .tile { position: relative; background: var(--bg-default); border: 1px solid var(--border-color); border-radius: var(--radius-lg); box-shadow: var(--shadow-xs); overflow: hidden; padding: var(--space-24); transition: box-shadow var(--duration-base) var(--ease-standard), transform var(--duration-base) var(--ease-standard); }
.tile:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.tile--xl { grid-column: span 8; grid-row: span 2; min-height: 360px; }
.tile--sm { grid-column: span 4; min-height: 176px; }
.tile--md { grid-column: span 6; min-height: 220px; }
  .tile__icon { position: absolute; top: var(--space-16); left: var(--space-16); width: 40px; height: 40px; border: 1px solid var(--border-color); border-radius: var(--radius-md); display: inline-flex; align-items: center; justify-content: center; color: var(--text-primary); background: var(--bg-default); }
.tile__icon svg { width: 20px; height: 20px; display: block; }
.tile__title { margin: 0; font-size: var(--fs-card); line-height: var(--lh-card); font-weight: var(--font-weight-semibold); letter-spacing: -0.01em; padding-left: 56px; }
.tile__desc { margin: var(--space-8) 0 var(--space-16); color: var(--text-secondary); font-size: var(--fs-body); line-height: var(--lh-body); padding-left: 56px; }
.tile__action { padding-left: 56px; }
.tile__media { position: absolute; inset: auto var(--space-24) var(--space-24) var(--space-24); border-radius: var(--radius-md); overflow: hidden; background: var(--neutral-50); }
.tile__media img { width: 100%; height: 220px; object-fit: cover; display: block; }

/* Variants */
.feature-tiles--quad .tile { grid-column: span 4; min-height: 220px; }
.feature-tiles--quad .tile--xl { grid-column: span 8; }
.feature-tiles--quad .tile--sm { grid-column: span 4; }
.feature-tiles--two-col .tile { grid-column: span 6; }
.feature-tiles--three .tile { grid-column: span 4; }
.tile--media-right { padding-right: 48%; }
.tile--media-right .tile__media { inset: var(--space-24) var(--space-24) var(--space-24) auto; width: 44%; height: auto; }
.tile--media-right .tile__media img { height: 100%; min-height: 160px; }

@media (min-width: 768px) and (max-width: 1199px) {
  .tile--xl {
    grid-column: span 12;
    grid-row: span 1;
    min-height: 320px;
    padding-bottom: 240px; /* 为图片预留空间 */
  }
  .tile--sm { grid-column: span 6; min-height: 200px; }
  .tile--md { grid-column: span 12; }
  .feature-tiles--quad .tile--xl { grid-column: span 12; }
  .feature-tiles--quad .tile--sm { grid-column: span 6; }
  .feature-tiles--two-col .tile { grid-column: span 12; }
  .feature-tiles--three .tile { grid-column: span 6; }
  /* 修复平板端智能家居区域图片显示 */
  .tile--xl .tile__media {
    position: absolute;
    bottom: var(--space-24);
    left: var(--space-24);
    right: var(--space-24);
    height: 200px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--neutral-50);
  }
  .tile--xl .tile__media img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
  }
  /* 确保小区域在平板端有合适的高度 */
  .feature-tiles--quad .tile--sm {
    min-height: 180px;
  }
}

@media (max-width: 767px) {
  .feature-tiles { grid-template-columns: repeat(4, 1fr); gap: var(--space-8); }
  .tile--xl, .tile--sm { grid-column: span 4; min-height: auto; }
  .tile--md { grid-column: span 4; }
  .feature-tiles--quad .tile { grid-column: span 4; }
  .feature-tiles--quad .tile--xl { grid-column: span 4; }
  .feature-tiles--quad .tile--sm { grid-column: span 4; min-height: 140px; }
  .feature-tiles--three .tile { grid-column: span 4; }
  .tile--media-right {
    padding-right: var(--space-24);
    display: flex;
    flex-direction: column;
  }
  .tile--media-right .tile__media {
    position: relative;
    width: 100%;
    inset: auto;
    height: 200px;
    margin-top: var(--space-16);
    margin-bottom: 0;
    order: 2;
  }
  .tile--media-right .tile__title,
  .tile--media-right .tile__desc,
  .tile--media-right .tile__action {
    padding-left: 56px;
  }
  /* 确保智能家居区域在手机端也能正确显示 */
  .tile--xl .tile__media {
    position: relative;
    width: 100%;
    inset: auto;
    height: 200px;
    margin-top: var(--space-16);
    margin-bottom: 0;
  }
  /* 确保小区域在手机端没有额外的间距 */
  .tile--sm { margin: 0; }
}

/* Theme & Language Switchers */
.theme-switcher, .lang-switcher { position: relative; }
.theme-toggle, .lang-toggle { appearance: none; border: none; background: transparent; color: inherit; display: flex; align-items: center; gap: 6px; padding: 6px 8px; border-radius: var(--radius-sm); cursor: pointer; font-size: var(--fs-caption); transition: background-color var(--duration-fast) var(--ease-standard); }
.theme-toggle:hover, .lang-toggle:hover { background: var(--bg-elevated); }
.nl-header--overlay .theme-toggle:hover, .nl-header--overlay .lang-toggle:hover { background: rgba(255,255,255,0.1); }
.theme-toggle svg, .lang-toggle svg { stroke: currentColor; fill: none; stroke-width: 2; transition: transform var(--duration-fast) var(--ease-standard); }
.lang-switcher.open .lang-toggle svg { transform: rotate(180deg); }
.theme-toggle svg { width: 16px; height: 16px; }
.lang-menu { position: absolute; top: 100%; right: 0; background: var(--bg-default); border: 1px solid var(--border-color); border-radius: var(--radius-md); box-shadow: var(--shadow-md); min-width: 120px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all var(--duration-fast) var(--ease-standard); z-index: 100; }
.lang-menu { background: color-mix(in oklab, var(--bg-default), transparent 12%); border-color: color-mix(in oklab, var(--border-color), transparent 30%); -webkit-backdrop-filter: saturate(160%) blur(12px); backdrop-filter: saturate(160%) blur(12px); }
.lang-switcher.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-option { appearance: none; border: none; background: none; width: 100%; display: flex; align-items: center; gap: 8px; padding: 8px 12px; cursor: pointer; font-size: var(--fs-caption); color: var(--text-primary); transition: background-color var(--duration-fast) var(--ease-standard); }
.lang-option:hover { background: color-mix(in oklab, var(--bg-elevated), transparent 20%); }
.lang-option.active { background: var(--brand-50); color: var(--brand-600); }
.dark .lang-option.active { background: color-mix(in oklab, var(--brand-500), transparent 85%); color: var(--brand-400); }
.lang-option .flag { font-size: 14px; }
.lang-option .name { font-weight: var(--font-weight-medium); }

  /* Overlay header variants for dropdown (better contrast over imagery) */
  .nl-header--overlay .lang-menu { background: rgba(255,255,255,0.92); border-color: color-mix(in oklab, #dfe1e5, transparent 40%); box-shadow: 0 12px 36px rgba(0,0,0,0.18); }
  .dark .nl-header--overlay .lang-menu { background: rgba(28,28,30,0.92); border-color: color-mix(in oklab, #38383a, transparent 40%); box-shadow: 0 12px 36px rgba(0,0,0,0.45); }

/* Stories & Insights Module */
.stories-insights { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: var(--space-48); 
  margin-top: var(--space-32); 
  align-items: stretch; /* 确保两栏高度一致 */
}
.section-kicker { margin-bottom: var(--space-20); }
.section-kicker__title { font-size: var(--fs-card); font-weight: var(--font-weight-semibold); color: var(--text-primary); margin: 0; }

/* Stories & Insights 左右栏宽度和高度平衡 */
.stories-insights__kol,
.stories-insights__blog { 
  width: 100%; 
  display: flex;
  flex-direction: column;
  /* 移除固定高度，让内容自动撑开 */
}

/* KOL Carousel */
.kol-carousel { 
  position: relative; 
  height: 100%; 
  display: flex; 
  flex-direction: column; 
}
.kol-carousel__viewport { 
  overflow: hidden; 
  margin: 0 -8px; 
  flex: 1;
  display: flex;
  align-items: center;
}
.kol-carousel__track { 
  display: flex; 
  gap: var(--space-16); 
  will-change: transform; 
  transition: transform 380ms cubic-bezier(0.2, 0.8, 0.2, 1); 
}

/* KOL卡片：基于容器宽度动态计算，确保显示2-2.5张 */
.kol-card { 
  flex: 0 0 calc((100% - var(--space-16)) / 2.2); /* 显示2.2张卡片 */
  background: var(--bg-default); 
  border: 1px solid var(--border-color); 
  border-radius: var(--radius-md); 
  overflow: hidden; 
  box-shadow: var(--shadow-xs); 
  transition: box-shadow var(--duration-base) var(--ease-standard), transform var(--duration-base) var(--ease-standard); 
  text-decoration: none; 
  color: inherit;
  height: 300px; /* 固定高度，确保与Blog Digest对齐 */
  display: flex;
  flex-direction: column;
}
.kol-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.kol-card__media { 
  aspect-ratio: 16/9; 
  background: var(--neutral-50); 
  overflow: hidden; 
  flex-shrink: 0;
}
.kol-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--duration-base) var(--ease-standard); }
.kol-card:hover .kol-card__media img { transform: scale(1.03); }
.kol-card__body { padding: var(--space-16); flex: 1; display: flex; flex-direction: column; justify-content: space-between; }
.kol-card__title { font-size: var(--fs-body); line-height: var(--lh-body); font-weight: var(--font-weight-semibold); margin: 0 0 var(--space-8); color: var(--text-primary); }
.kol-card__meta { font-size: var(--fs-small); line-height: var(--lh-small); color: var(--text-secondary); margin-bottom: var(--space-8); }
.kol-card__more { font-size: var(--fs-small); color: var(--brand-600); opacity: 0; transition: opacity var(--duration-fast) var(--ease-standard); }
.kol-card:hover .kol-card__more { opacity: 1; }

.kol-carousel__arrow { position: absolute; top: 50%; transform: translateY(-50%); width: 32px; height: 32px; border-radius: var(--radius-pill); border: 1px solid var(--border-color); background: color-mix(in oklab, var(--bg-default), transparent 10%); color: var(--text-primary); display: inline-flex; align-items: center; justify-content: center; cursor: pointer; z-index: 2; box-shadow: var(--shadow-xs); transition: background-color var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard), opacity var(--duration-fast) var(--ease-standard); }
.kol-carousel__arrow:hover { background: var(--bg-elevated); transform: translateY(-50%) scale(1.04); }
.kol-carousel__arrow:disabled { opacity: .4; cursor: default; }
.kol-carousel__arrow--prev { left: -16px; }
.kol-carousel__arrow--next { right: -16px; }

/* Blog Digest */
.blog-digest { 
  display: flex; 
  flex-direction: column; 
  gap: var(--space-24); 
  flex: 1; /* 占满剩余高度 */
  justify-content: space-evenly; /* 均匀分布博客项目 */
}
.blog-digest__item { 
  padding: var(--space-20); 
  border: 1px solid var(--border-color); 
  border-radius: var(--radius-md); 
  transition: border-color var(--duration-fast) var(--ease-standard), box-shadow var(--duration-fast) var(--ease-standard); 
  cursor: pointer; 
  text-decoration: none; 
  color: inherit; 
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1; /* 两个博客项目等高分布 */
}
.blog-digest__item:hover { border-color: var(--brand-500); box-shadow: var(--shadow-xs); }
.blog-digest__title { font-size: var(--fs-body); line-height: var(--lh-body); font-weight: var(--font-weight-semibold); margin: 0 0 var(--space-8); color: var(--text-primary); transition: color var(--duration-fast) var(--ease-standard); }
.blog-digest__item:hover .blog-digest__title { color: var(--brand-600); text-decoration: underline; }
.blog-digest__summary { font-size: var(--fs-caption); line-height: var(--lh-caption); color: var(--text-secondary); margin: 0 0 var(--space-12); flex: 1; }
.blog-digest__meta { font-size: var(--fs-small); line-height: var(--lh-small); color: var(--text-secondary); }

/* Stories CTA */
.stories-insights__cta { text-align: center; margin-top: var(--space-48); }

/* Responsive Layout */
@media (max-width: 1199px) {
  .stories-insights { grid-template-columns: 1fr; gap: var(--space-32); align-items: start; }
  .stories-insights__blog { order: 2; }
  .stories-insights__kol,
  .stories-insights__blog { 
    /* 在响应式布局下移除flex，恢复独立高度 */
    display: block;
  }
  .kol-card { 
    flex: 0 0 calc((100% - var(--space-16)) / 2); /* 平板显示2张卡片 */
    height: auto; /* 改为自动高度，让内容决定 */
    min-height: 280px; /* 设置最小高度确保足够空间 */
  }
  .kol-card__media { 
    aspect-ratio: 16/9; 
    flex-shrink: 0; 
  }
  .kol-card__body { 
    padding: var(--space-16); 
    flex: 1; 
    min-height: 120px; /* 确保文字区域有足够空间 */
  }
}

@media (max-width: 767px) {
  .stories-insights { gap: var(--space-24); margin-top: var(--space-24); align-items: start; }
  .stories-insights__kol,
  .stories-insights__blog { 
    display: block;
  }
  .kol-carousel__viewport { margin: 0 -4px; }
  .kol-carousel__track { gap: var(--space-12); }
  .kol-card { 
    flex: 0 0 calc((100% - var(--space-12)) / 1.5); /* 手机显示1.5张卡片 */
    height: auto; /* 改为自动高度 */
    min-height: 260px; /* 手机端最小高度 */
  }
  .kol-card__media { 
    aspect-ratio: 16/9; 
    flex-shrink: 0; 
  }
  .kol-card__body { 
    padding: var(--space-12); /* 减少内边距节省空间 */
    flex: 1; 
    min-height: 100px; /* 手机端文字区域最小高度 */
  }
  .kol-card__title { 
    font-size: var(--fs-caption); /* 手机端标题稍小 */
    line-height: var(--lh-caption);
    margin: 0 0 var(--space-6); 
  }
  .kol-card__meta { 
    font-size: var(--fs-small); 
    margin-bottom: var(--space-6); 
  }
  .kol-card__more { 
    font-size: var(--fs-small); 
  }
  .kol-carousel__arrow { width: 28px; height: 28px; }
  .kol-carousel__arrow--prev { left: -8px; }
  .kol-carousel__arrow--next { right: -8px; }
  .blog-digest { gap: var(--space-16); justify-content: flex-start; }
  .blog-digest__item { padding: var(--space-16); flex: none; }
  .stories-insights__cta { margin-top: var(--space-32); }
}

/* i18n Layout Adjustments */
[data-i18n] { word-wrap: break-word; hyphens: auto; }
.hero__title[data-i18n] { line-height: var(--lh-hero); }
.tile__title[data-i18n] { line-height: var(--lh-card); min-height: calc(var(--fs-card) * var(--lh-card) * 1.5); }
.product-card__title[data-i18n] { min-height: calc(var(--fs-card) * var(--lh-card) * 2); }