/*!
Theme Name: Corporate GEO Enterprise
Theme URI: https://www.gzzxsc.cn
Author: AI Assistant
Description: Enterprise-grade WordPress theme with native SEO and GEO (Generative Engine Optimization) support. Built for AI search engines, featuring full Schema.org integration, semantic HTML5 architecture, and modern performance optimization.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: corporate-geo
Tags: corporate, business, enterprise, seo-optimized, geo-optimized, block-theme, responsive, accessibility
Requires at least: 6.0
Requires PHP: 8.0
*/

/* ===========================================
   CSS Variables & Global Settings
   =========================================== */

:root {
    /* Primary Brand Colors */
    --color-primary: #2563eb;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #1e40af;
    
    /* Secondary Brand Colors */
    --color-secondary: #10b981;
    --color-secondary-light: #34d399;
    --color-secondary-dark: #059669;
    
    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Typography */
    --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ===========================================
   Reset & Base Styles
   =========================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    overflow-x: hidden;
}

img,
video,
canvas,
svg,
select,
textarea {
    max-width: 100%;
}

img {
    height: auto;
    display: block;
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

ul, ol {
    list-style-position: inside;
    margin-bottom: var(--spacing-md);
}

/* ===========================================
   Container & Layout
   =========================================== */

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-narrow {
    max-width: 960px;
}

.container-wide {
    max-width: 1440px;
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
    display: flex;
    gap: var(--spacing-md);
}

.flex-center {
    align-items: center;
    justify-content: center;
}

.flex-between {
    justify-content: space-between;
}

.flex-wrap {
    flex-wrap: wrap;
}

/* ===========================================
   Components - Buttons
   =========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-gray-700);
    border: 2px solid var(--color-gray-300);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===========================================
   Header & Navigation
   =========================================== */

.site-header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-logo img {
    height: 40px;
    width: auto;
}

.main-navigation ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.main-navigation a {
    color: var(--color-gray-700);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.main-navigation a:hover {
    color: var(--color-primary);
}

.main-navigation .current-menu-item > a {
    color: var(--color-primary);
    font-weight: 700;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
}

/* ===========================================
   Hero Section
   =========================================== */

.hero {
    position: relative;
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 编辑
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0 100 L100 100 L100 0 Z" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 100px 100px;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    font-size: clamp(2rem, 5vw, 3.5rem);
}

.hero p {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    margin-bottom: var(--spacing-xl);
    color: rgba(255, 255, 255, 0.9);
    max-width: 800px;
}

/* ===========================================
   Content Sections
   =========================================== */

.section {
    padding: var(--spacing-3xl) 0;
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.section-header p {
    color: var(--color-gray-600);
    max-width: 700px;
    margin: 0 auto;
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-gray-900);
    position: relative;
    padding-left: var(--spacing-lg);
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

/* ===========================================
   Cards & Grid Layouts
   =========================================== */

.card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--color-gray-200);
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.card-body {
    color: var(--color-gray-600);
}

.card-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-200);
}

/* ===========================================
   Blog & Article Styles
   =========================================== */

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.article-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-image {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    background: var(--color-gray-200);
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-sm);
    align-items: center;
}

.article-meta time,
.article-meta .author {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.article-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-title a {
    color: var(--color-gray-900);
    transition: color var(--transition-fast);
}

.article-title a:hover {
    color: var(--color-primary);
}

.article-excerpt {
    color: var(--color-gray-600);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

/* ===========================================
   SEO & GEO Optimized Elements
   =========================================== */

/* Breadcrumbs */
.breadcrumbs {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.breadcrumbs ol {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.breadcrumbs li:not(:last-child)::after {
    content: '›';
    margin-left: var(--spacing-sm);
    color: var(--color-gray-400);
}

.breadcrumbs a {
    color: var(--color-gray-600);
}

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

/* Schema Visual Indicators */
.schema-faq {
    background: var(--color-gray-50);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-md);
}

.schema-faq summary {
    font-weight: 600;
    cursor: pointer;
    padding: var(--spacing-sm) 0;
    color: var(--color-gray-900);
    list-style: none;
}

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

.schema-faq p {
    margin-top: var(--spacing-md);
    color: var(--color-gray-600);
    padding-left: var(--spacing-md);
}

/* Author Box (E-E-A-T) */
.author-box {
    background: var(--color-gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-2xl) 0;
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-info {
    flex-grow: 1;
}

.author-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-gray-900);
}

.author-bio {
    color: var(--color-gray-600);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.author-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.875rem;
}

.author-meta span {
    background: var(--color-white);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-gray-200);
}

/* ===========================================
   Footer
   =========================================== */

.site-footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-title {
    color: var(--color-white);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-gray-300);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--color-gray-800);
    padding-top: var(--spacing-xl);
    text-align: center;
    font-size: 0.875rem;
}

/* ===========================================
   Accessibility Enhancements
   =========================================== */

/* Focus Styles */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip to Content */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 8px;
    z-index: 9999;
    transition: top 0.3s;
}

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

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===========================================
   Responsive Design
   =========================================== */

/* Tablets */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 1.25rem;
        --spacing-xl: 1.75rem;
        --spacing-2xl: 2.5rem;
    }
    
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-md: 0.875rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 3rem;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .main-navigation {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-md);
    }
    
    .main-navigation.active {
        display: block;
    }
    
    .main-navigation ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-navigation a {
        padding: var(--spacing-md) 0;
        display: block;
        border-bottom: 1px solid var(--color-gray-200);
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.125rem;
    }
    
    .author-box {
        flex-direction: column;
        text-align: center;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
}

/* ===========================================
   Print Styles
   =========================================== */

@media print {
    .site-header,
    .site-footer,
    .hero {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: #000;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
}

/* ===========================================
   Performance Optimizations
   =========================================== */

/* Critical CSS Above the Fold */
.critical-css {
    display: block;
}

/* Lazy Loading Indicators */
.lazy-load {
    background: var(--color-gray-200);
    min-height: 200px;
}

/* Image Optimization */
img[loading="lazy"] {
    transition: opacity 0.3s;
    opacity: 0;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Prefetch Hint */
@prefetch {
    /* Styles for prefetched resources */
}

/* Preload Critical Resources */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.3s ease-in;
}