* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-500: #2468F2;
    --primary-600: #1851C2;
    --primary-700: #0E4FC7;
    --accent-300: #D4A648;
    --gray-50: #FFFFFF;
    --gray-100: #FAFBFD;
    --gray-200: #F7F9FC;
    --gray-300: #E8ECF1;
    --gray-400: #A0A8B8;
    --gray-500: #727C8E;
    --gray-600: #4A5568;
    --gray-700: #1A1F2E;
    --gray-800: #0F131E;
    --text-primary: #1A1F2E;
    --text-secondary: #4A5568;
    --text-tertiary: #727C8E;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F7F9FC;
    --bg-tertiary: #FAFBFD;
    --border-color: #E8ECF1;
    --radius-xs: 0;
    --radius-sm: 0;
    --radius-md: 0;
    --radius-lg: 0;
    --radius-xl: 0;
    --radius-full: 0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --content-max-width: 1440px;
    --font-h1: 700 36px/44px inherit;
    --font-h2: 700 28px/36px inherit;
    --font-h3: 600 20px/28px inherit;
    --font-h4: 600 16px/24px inherit;
    --font-body-l: 400 16px/24px inherit;
    --font-body: 400 14px/22px inherit;
    --font-body-s: 400 14px/22px inherit;
    --font-caption: 400 13px/20px inherit;
    --font-tag: 600 11px/16px inherit;
    --font-btn: 600 14px/20px inherit;
    --font-btn-lg: 600 16px/24px inherit;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
}

html {
    scroll-behavior: smooth;
}

html.page-leaving body {
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.2s ease-out, transform 0.2s ease-out;
    pointer-events: none;
}

html.page-entering body {
    animation: pageEnter 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-transition-overlay {
    position: fixed;
    inset: 0;
    z-index: 99999;
    background: #fff;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

html.page-leaving .page-transition-overlay {
    opacity: 1;
}

html.page-entering .page-transition-overlay {
    opacity: 1;
    animation: overlayFadeOut 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes overlayFadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

.glass-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.module-loading {
    min-height: 72px;
    position: relative;
    overflow: hidden;
}

.module-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: moduleShimmer 1.5s infinite;
}

@keyframes moduleShimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.module-nav-loading {
    height: 72px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-color);
}

#module-nav {
    position: relative;
    z-index: 1000;
}

.module-footer-loading {
    min-height: 200px;
    background: var(--gray-700);
}

.module-content-loaded {
    animation: moduleFadeIn 0.3s ease-out forwards;
}

@keyframes moduleFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.page-transition-overlay {
    will-change: transform, opacity;
}

.module-content-loaded {
    will-change: opacity;
}

.sol-section,
.section,
.hot-recommend-section,
.scene-dev-section,
.partner-section,
.cloud-solution-section {
    content-visibility: auto;
    contain-intrinsic-size: auto 500px;
}

.sol-hero,
.hero-carousel,
.custom-modal-overlay {
    content-visibility: visible;
}

.skip-nav {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-500);
    color: #fff;
    padding: 8px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 0;
    z-index: 100000;
    text-decoration: none;
    transition: top 0.2s ease;
}

.skip-nav:focus {
    top: 0;
}