/* Redgameflow - Main Stylesheet - Card Layout Design */
:root {
    --primary: #F97316;
    --primary-dark: #EA580C;
    --secondary: #FB923C;
    --accent: #FBBF24;
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --text-primary: #1A1A2E;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #FAFBFC;
    --bg-tertiary: #F1F5F9;
    --bg-dark: #0F172A;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 30px rgba(249, 115, 22, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, #F97316 0%, #FB923C 50%, #FBBF24 100%);
    --gradient-dark: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
}

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

body {
    font-family: 'Space Grotesk', 'Inter', -apple-system, sans-serif;
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.6;
    min-height: 100vh;
}

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* Header - 简洁透明风格 */
header {
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    max-width: 1280px;
    margin: 0 auto;
}

.logo {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu { display: flex; list-style: none; gap: 32px; }

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-menu a:hover { color: var(--primary); }
.nav-menu a:hover::after { width: 100%; }
.mobile-menu-toggle { 
    display: none; 
    background: none; 
    border: none; 
    font-size: 1.5rem; 
    cursor: pointer; 
    color: var(--text-primary);
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-family: 'Space Grotesk', sans-serif;
}

.btn-primary { background: var(--gradient-primary); color: white; box-shadow: 0 4px 15px rgba(249, 115, 22, 0.3); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(249, 115, 22, 0.4); }
.btn-lg { padding: 18px 36px; font-size: 1.05rem; border-radius: var(--radius-lg); }
.btn-secondary { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-secondary:hover { background: var(--border-color); }
.btn-white { background: white; color: var(--primary); }
.btn-white:hover { background: rgba(255,255,255,0.95); transform: translateY(-2px); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: white; }
.btn-sm { padding: 10px 20px; font-size: 0.9rem; }

/* ========== NEW HERO BANNER ========== */
.hero-banner {
    position: relative;
    padding: 100px 24px 80px;
    background: linear-gradient(180deg, #FFF7ED 0%, var(--bg-secondary) 100%);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: radial-gradient(circle at 20% 50%, rgba(249, 115, 22, 0.08) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, rgba(251, 191, 36, 0.08) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content { position: relative; max-width: 800px; margin: 0 auto; text-align: center; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: white;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.hero-badge i { color: var(--success); }

.hero-content h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.hero-search {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 500px;
    margin: 0 auto 40px;
    padding: 16px 24px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 2px solid transparent;
    transition: var(--transition);
}

.hero-search:focus-within { border-color: var(--primary); box-shadow: var(--shadow-glow); }
.hero-search i { color: var(--text-light); font-size: 1.1rem; }
.hero-search input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    font-family: inherit;
    background: transparent;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
}

.stat-item { text-align: center; }
.stat-num { display: block; font-size: 2rem; font-weight: 700; color: var(--primary); font-family: 'Space Grotesk', sans-serif; }
.stat-label { font-size: 0.9rem; color: var(--text-secondary); }

/* ========== TOOLS SHOWCASE - MASONRY GRID ========== */
.tools-showcase { padding: 80px 24px; }

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
}

.section-header h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 700;
}

.tool-filters { display: flex; gap: 10px; flex-wrap: wrap; }

.filter-btn {
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    background: white;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.filter-btn.active { background: var(--primary); color: white; border-color: var(--primary); }

.tools-masonry {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: minmax(120px, auto);
    gap: 20px;
}

/* Tool Tiles - 瓷砖卡片样式 */
.tool-tile {
    background: white;
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    position: relative;
}

.tool-tile:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.tool-tile .tile-icon {
    width: 60px;
    min-width: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent, #F97316) 0%, color-mix(in srgb, var(--accent, #F97316) 80%, white) 100%);
    font-size: 1.5rem;
    color: white;
}

.tool-tile .tile-content { padding: 20px; flex: 1; }
.tool-tile .tile-content h3 { font-size: 1.1rem; margin-bottom: 6px; font-family: 'Space Grotesk', sans-serif; }
.tool-tile .tile-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; margin: 0; }

.tile-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--primary);
    margin-top: 10px;
}

.tile-arrow {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: var(--transition);
    color: var(--primary);
}

.tool-tile:hover .tile-arrow { opacity: 1; right: 15px; }

/* Large Tile - 大卡片 */
.tool-tile.large {
    grid-column: span 2;
    grid-row: span 2;
    flex-direction: column;
}

.tool-tile.large .tile-icon {
    width: 100%;
    height: 100px;
    font-size: 2.5rem;
}

.tool-tile.large .tile-content { padding: 24px; }
.tool-tile.large .tile-content h3 { font-size: 1.4rem; margin-bottom: 10px; }
.tool-tile.large .tile-content p { font-size: 1rem; }

/* Medium Tile - 中卡片 */
.tool-tile.medium {
    grid-column: span 1;
    grid-row: span 1;
    flex-direction: column;
}

.tool-tile.medium .tile-icon {
    width: 100%;
    height: 60px;
    font-size: 1.5rem;
}

.tool-tile.medium .tile-content { padding: 16px; }
.tool-tile.medium .tile-content h3 { font-size: 1rem; margin-bottom: 4px; }
.tool-tile.medium .tile-content p { font-size: 0.85rem; }

/* Small Tile - 小卡片 */
.tool-tile.small {
    grid-column: span 1;
    grid-row: span 1;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
}

.tool-tile.small .tile-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.tool-tile.small h3 { font-size: 0.95rem; margin: 0; }

/* ========== FEATURES STRIP ========== */
.features-strip {
    padding: 30px 24px;
    background: var(--bg-tertiary);
    overflow: hidden;
}

.features-scroll {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: white;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.feature-chip i { color: var(--primary); }

/* ========== QUICK GUIDE ========== */
.quick-guide {
    padding: 80px 24px;
    background: var(--gradient-dark);
    color: white;
}

.guide-content { max-width: 800px; margin: 0 auto; text-align: center; }
.guide-content h2 { font-family: 'Space Grotesk', sans-serif; font-size: 2rem; margin-bottom: 40px; }

.guide-steps { display: flex; align-items: center; justify-content: center; gap: 20px; margin-bottom: 40px; flex-wrap: wrap; }

.guide-step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.step-num {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.guide-arrow { color: var(--primary); font-size: 1.2rem; }

/* Footer */
footer { background: var(--text-primary); color: white; padding: 60px 20px 30px; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1200px; margin: 0 auto; }
.footer-section h3 { font-size: 1.1rem; margin-bottom: 20px; }
.footer-section p { color: var(--text-light); font-size: 0.9rem; line-height: 1.8; }
.footer-section ul { list-style: none; }
.footer-section ul li { margin-bottom: 10px; }
.footer-section ul a { color: var(--text-light); text-decoration: none; transition: var(--transition); }
.footer-section ul a:hover { color: var(--primary); }
.social-links { display: flex; gap: 15px; margin-top: 20px; }
.social-links a { color: var(--text-light); font-size: 1.2rem; transition: var(--transition); }
.social-links a:hover { color: var(--primary); }
.footer-bottom { text-align: center; padding-top: 30px; margin-top: 40px; border-top: 1px solid rgba(255,255,255,0.1); color: var(--text-light); font-size: 0.85rem; }

/* Tool Page Layout */
.tool-page { padding: 40px 20px; }
.page-header { text-align: center; margin-bottom: 40px; }
.page-header h1 { font-size: 2rem; display: flex; align-items: center; justify-content: center; gap: 15px; }
.page-header h1 i { color: var(--primary); }
.page-header p { color: var(--text-secondary); margin-top: 10px; }

.tool-container { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; max-width: 1200px; margin: 0 auto; }
.tool-panel { background: var(--bg-primary); padding: 30px; border-radius: var(--radius-lg); }
.tool-panel h2 { font-size: 1.2rem; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }

/* Form Controls */
.form-control { width: 100%; padding: 12px 15px; border: 1px solid var(--border-color); border-radius: var(--radius-md); font-size: 1rem; transition: var(--transition); background: var(--bg-secondary); }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1); }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; }

/* Upload Area */
.upload-area { border: 2px dashed var(--border-color); border-radius: var(--radius-lg); padding: 60px 30px; text-align: center; cursor: pointer; transition: var(--transition); background: var(--bg-secondary); }
.upload-area:hover, .upload-area.dragover { border-color: var(--primary); background: rgba(249, 115, 22, 0.05); }
.upload-area i { font-size: 3rem; color: var(--primary); margin-bottom: 15px; }
.upload-area h3 { font-size: 1.2rem; margin-bottom: 10px; }
.upload-area p { color: var(--text-secondary); font-size: 0.9rem; }
.upload-area input[type="file"] { display: none; }

/* Image Preview */
.image-preview { margin-top: 20px; text-align: center; }
.image-preview img { max-width: 100%; max-height: 400px; border-radius: var(--radius-md); box-shadow: var(--shadow-md); }
.image-info { margin-top: 15px; padding: 15px; background: var(--bg-secondary); border-radius: var(--radius-md); }
.image-info p { font-size: 0.9rem; color: var(--text-secondary); margin: 5px 0; }

/* Tool Actions */
.tool-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }

/* Results Panel */
.results-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.result-item { background: var(--bg-secondary); padding: 20px; border-radius: var(--radius-md); text-align: center; }
.result-value { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.result-label { font-size: 0.85rem; color: var(--text-secondary); margin-top: 5px; }

/* Slider Control */
.slider-control { margin: 20px 0; }
.slider-control label { display: flex; justify-content: space-between; margin-bottom: 10px; }
.slider-control input[type="range"] { width: 100%; accent-color: var(--primary); }

/* Notification */
.notification { position: fixed; bottom: 20px; right: 20px; padding: 15px 25px; border-radius: var(--radius-md); color: white; font-weight: 500; z-index: 1000; animation: slideIn 0.3s ease; }
.notification.success { background: var(--success); }
.notification.error { background: var(--error); }
.notification.info { background: var(--primary); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* Page Content */
.page-content { padding: 40px 20px; min-height: calc(100vh - 200px); }

/* About & Contact Pages */
.about-section { background: var(--bg-primary); padding: 40px; border-radius: var(--radius-lg); margin-bottom: 30px; }
.about-content h2 { font-size: 1.5rem; margin: 30px 0 15px; color: var(--text-primary); }
.about-content h2:first-child { margin-top: 0; }
.about-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 15px; }
.tools-list { list-style: none; padding: 0; margin: 20px 0; }
.tools-list li { padding: 12px 0; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); }
.tools-list li:last-child { border-bottom: none; }
.tools-list li strong { color: var(--primary); }

.contact-cta { background: linear-gradient(135deg, var(--primary), var(--secondary)); padding: 50px 40px; border-radius: var(--radius-lg); text-align: center; color: white; }
.contact-cta h2 { font-size: 1.8rem; margin-bottom: 10px; }
.contact-cta p { opacity: 0.9; margin-bottom: 25px; }
.contact-cta .btn { background: white; color: var(--primary); }

.contact-container { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; max-width: 1000px; margin: 0 auto; }
.contact-info h2, .contact-form-container h2 { font-size: 1.5rem; margin-bottom: 20px; }
.contact-methods { margin: 30px 0; }
.contact-item { display: flex; gap: 15px; margin-bottom: 25px; }
.contact-item i { font-size: 1.5rem; color: var(--primary); }
.contact-item h3 { font-size: 1rem; margin-bottom: 5px; }
.contact-item p { color: var(--text-secondary); }
.contact-form { background: var(--bg-primary); padding: 30px; border-radius: var(--radius-lg); }
.btn-block { width: 100%; }

.social-icons { display: flex; gap: 15px; margin-top: 10px; }
.social-icons a { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: var(--bg-secondary); border-radius: 50%; color: var(--text-secondary); transition: var(--transition); }
.social-icons a:hover { background: var(--primary); color: white; }

/* ========== CONTACT PAGE ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    max-width: 1100px;
    margin: 0 auto;
}

.contact-form-section {
    background: white;
    padding: 40px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.contact-form-section h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.contact-form .form-group { margin-bottom: 20px; }
.contact-form .form-group label { font-weight: 600; color: var(--text-primary); margin-bottom: 8px; display: block; }
.contact-form .form-control { background: var(--bg-tertiary); border: 2px solid transparent; }
.contact-form .form-control:focus { border-color: var(--primary); background: white; }
.contact-form textarea.form-control { resize: vertical; min-height: 120px; }

.contact-info-section h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-info-item:hover { transform: translateX(5px); box-shadow: var(--shadow-md); }
.contact-info-item i { font-size: 1.5rem; color: var(--primary); margin-top: 4px; }
.contact-info-item h3 { font-size: 1rem; margin-bottom: 4px; color: var(--text-primary); }
.contact-info-item p { color: var(--text-secondary); font-size: 0.95rem; margin: 0; }

.faq-section {
    margin-top: 30px;
    padding: 30px;
    background: linear-gradient(135deg, #FFF7ED 0%, #FEF3C7 100%);
    border-radius: var(--radius-xl);
}

.faq-section h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.faq-item { margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid rgba(0,0,0,0.08); }
.faq-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
.faq-item h4 { font-size: 0.95rem; color: var(--text-primary); margin-bottom: 6px; }
.faq-item p { font-size: 0.9rem; color: var(--text-secondary); margin: 0; line-height: 1.6; }

/* ========== LEGAL PAGES (Terms & Privacy) ========== */
.legal-page .page-header { margin-bottom: 50px; }
.legal-page .page-header h1 i { color: var(--primary); }

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 50px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.legal-content section { margin-bottom: 35px; }
.legal-content section:last-child { margin-bottom: 0; }

.legal-content h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--bg-tertiary);
}

.legal-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.legal-content ul {
    list-style: none;
    padding: 0;
    margin: 15px 0;
}

.legal-content ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.legal-content ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    background: var(--gradient-primary);
    border-radius: 50%;
}

.legal-content ul li strong { color: var(--primary); }
.legal-content a { color: var(--primary); text-decoration: none; font-weight: 500; }
.legal-content a:hover { text-decoration: underline; }

/* ========== ABOUT PAGE ========== */
.content-section {
    background: white;
    padding: 40px;
    border-radius: var(--radius-xl);
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

.content-section h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

.content-section p:last-child { margin-bottom: 0; }

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: white;
}

.feature-item i {
    font-size: 1.5rem;
    color: var(--primary);
    margin-top: 4px;
}

.feature-item h3 {
    font-size: 1rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* ========== RESPONSIVE - Pages ========== */
@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-form-section { padding: 30px 20px; }

    .legal-content { padding: 30px 20px; }

    .content-section { padding: 30px 20px; }

    .feature-list { grid-template-columns: 1fr; }
}

/* Utility */
.mt-3 { margin-top: 20px; }
.center { text-align: center; }

/* ========== BLOG PAGES ========== */
.blog-hero {
    padding: 80px 24px 60px;
    background: linear-gradient(180deg, #FFF7ED 0%, var(--bg-secondary) 100%);
    text-align: center;
}

.blog-hero-content h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.blog-hero-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.blog-main { padding: 60px 24px; }

/* Featured Post */
.featured-post {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 60px;
}

.featured-image {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.featured-image i { font-size: 5rem; color: white; opacity: 0.9; }

.featured-content {
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-content h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.8rem;
    margin: 16px 0;
    line-height: 1.3;
}

.featured-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

/* Blog Tags */
.blog-tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Blog Meta */
.blog-meta {
    display: flex;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.blog-meta span { display: flex; align-items: center; gap: 6px; }
.blog-meta i { font-size: 0.85rem; }

/* Blog Section Header */
.blog-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.blog-section-header h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
}

.blog-filters { display: flex; gap: 10px; }

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.blog-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.blog-card-image {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.blog-card-image i { font-size: 3rem; color: white; opacity: 0.9; }

.blog-card-content { padding: 24px; }

.blog-card-content h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    margin: 12px 0 10px;
    line-height: 1.4;
}

.blog-card-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transition: var(--transition);
}

.read-more:hover { gap: 10px; }

/* Newsletter Card */
.newsletter-card {
    display: flex;
    align-items: center;
    gap: 30px;
    padding: 40px;
    background: linear-gradient(135deg, #FFF7ED 0%, #FEF3C7 100%);
    border-radius: var(--radius-xl);
    flex-wrap: wrap;
}

.newsletter-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.newsletter-icon i { font-size: 1.8rem; color: white; }

.newsletter-content { flex: 1; min-width: 200px; }
.newsletter-content h2 { font-family: 'Space Grotesk', sans-serif; font-size: 1.4rem; margin-bottom: 6px; }
.newsletter-content p { color: var(--text-secondary); font-size: 0.95rem; margin: 0; }

.newsletter-form {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.newsletter-form input {
    padding: 14px 20px;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    min-width: 250px;
    background: white;
    transition: var(--transition);
}

.newsletter-form input:focus { outline: none; border-color: var(--primary); }

/* ========== ARTICLE PAGE ========== */
.article-page { min-height: 100vh; }

.article-hero {
    padding: 100px 24px 60px;
    color: white;
    text-align: center;
}

.article-hero .container { max-width: 800px; }

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 20px;
    transition: var(--transition);
}

.back-link:hover { color: white; }

.article-hero h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 16px 0 24px;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    font-size: 0.95rem;
    opacity: 0.9;
}

.article-meta span { display: flex; align-items: center; gap: 6px; }

.article-content {
    padding: 60px 24px;
    background: var(--bg-secondary);
}

.article-content .container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 50px;
    max-width: 1100px;
}

.article-body {
    background: white;
    padding: 50px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.article-body .lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.article-body h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    margin: 40px 0 20px;
    color: var(--text-primary);
}

.article-body h3 {
    font-size: 1.2rem;
    margin: 30px 0 15px;
    color: var(--text-primary);
}

.article-body p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.article-body ul {
    margin: 16px 0;
    padding-left: 24px;
}

.article-body ul li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 8px;
}

.article-body strong { color: var(--text-primary); }

.info-box {
    background: linear-gradient(135deg, #FFF7ED 0%, #FEF3C7 100%);
    padding: 24px;
    border-radius: var(--radius-lg);
    margin: 24px 0;
    border-left: 4px solid var(--primary);
}

.info-box h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--primary);
}

.info-box p { margin: 0; color: var(--text-secondary); }

.cta-box {
    background: var(--gradient-dark);
    padding: 30px;
    border-radius: var(--radius-xl);
    margin: 30px 0;
    text-align: center;
    color: white;
}

.cta-box h3 { font-family: 'Space Grotesk', sans-serif; margin-bottom: 10px; }
.cta-box p { opacity: 0.9; margin-bottom: 20px; }

/* Article Sidebar */
.article-sidebar { display: flex; flex-direction: column; gap: 24px; }

.sidebar-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.sidebar-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--bg-tertiary);
}

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

.related-tools li, .related-articles li { margin-bottom: 12px; }

.related-tools a, .related-articles a {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
}

.related-tools a:hover, .related-articles a:hover { color: var(--primary); }
.related-tools i { color: var(--primary); width: 20px; }

/* Responsive Blog */
@media (max-width: 900px) {
    .featured-post { grid-template-columns: 1fr; }
    .featured-image { min-height: 200px; }
    .article-content .container { grid-template-columns: 1fr; }
    .article-sidebar { order: -1; }
}

@media (max-width: 768px) {
    .blog-hero-content h1 { font-size: 2rem; }
    .article-hero h1 { font-size: 1.8rem; }
    .article-body { padding: 30px 20px; }
    .newsletter-card { flex-direction: column; text-align: center; }
    .newsletter-form { width: 100%; justify-content: center; }
    .newsletter-form input { min-width: auto; flex: 1; }
}


/* ========== MOBILE OPTIMIZATIONS ========== */
/* 确保触摸目标足够大 */
@media (max-width: 768px) {
    .btn, .filter-btn, .tool-tile {
        min-height: 44px;
    }
    
    /* 搜索框优化 */
    .hero-search input {
        font-size: 16px; /* 防止 iOS Safari 缩放 */
        padding: 12px 16px 12px 48px;
    }
    
    /* 工具卡片触摸优化 */
    .tool-tile {
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    
    .tool-tile:active {
        transform: scale(0.98);
    }
    
    /* 表单控件优化 */
    .form-control, select.form-control {
        font-size: 16px; /* 防止 iOS Safari 缩放 */
        min-height: 44px;
    }
    
    /* 导航菜单动画 */
    .nav-menu {
        animation: slideDown 0.3s ease-out;
    }
    
    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}

/* 横屏手机优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .hero-banner {
        padding: 20px 0;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero-stats {
        flex-direction: row;
        justify-content: center;
        gap: 24px;
    }
}

/* 超小屏设备优化 */
@media (max-width: 320px) {
    .container {
        padding: 0 8px;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .tools-masonry {
        gap: 8px;
    }
    
    .tool-tile {
        padding: 12px;
    }
    
    .btn {
        padding: 10px 16px;
        font-size: 0.85rem;
    }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .tool-tile .tile-icon i {
        transform: translateZ(0); /* 启用硬件加速 */
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #F8FAFC;
        --text-secondary: #CBD5E1;
        --text-light: #94A3B8;
        --bg-primary: #0F172A;
        --bg-secondary: #1E293B;
        --bg-tertiary: #334155;
        --border-color: #475569;
    }
    
    .tool-tile {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
    }
    
    header {
        background: rgba(15, 23, 42, 0.9);
        border-bottom-color: var(--border-color);
    }
}

/* Knowledge Hub Styles */
.knowledge-hub {
    padding: 100px 0;
    background: linear-gradient(135deg, #fafbfc 0%, #f1f5f9 100%);
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.knowledge-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.knowledge-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.knowledge-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
    color: white;
}

.knowledge-card.featured .knowledge-points li {
    color: rgba(255,255,255,0.9);
}

.knowledge-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    background: rgba(249, 115, 22, 0.1);
    color: var(--primary);
}

.knowledge-card.featured .knowledge-icon {
    background: rgba(255,255,255,0.2);
    color: white;
}

.knowledge-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.knowledge-badge.hot {
    background: var(--error);
}

.knowledge-badge.new {
    background: var(--success);
}

.knowledge-card.featured .knowledge-badge {
    background: rgba(255,255,255,0.2);
    color: white;
}

.knowledge-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.knowledge-card.featured h3 {
    color: white;
}

.knowledge-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.knowledge-card.featured p {
    color: rgba(255,255,255,0.9);
}

.knowledge-points {
    list-style: none;
    margin-bottom: 24px;
}

.knowledge-points li {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.knowledge-points i {
    color: var(--success);
    font-size: 12px;
}

.knowledge-card.featured .knowledge-points i {
    color: rgba(255,255,255,0.8);
}

.knowledge-stats {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--text-light);
}

.knowledge-card.featured .knowledge-stats {
    color: rgba(255,255,255,0.7);
}

.knowledge-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.knowledge-cta {
    text-align: center;
    margin-top: 48px;
}

/* Quick Tips Styles */
.quick-tips {
    padding: 80px 0;
    background: var(--bg-primary);
}

.quick-tips h2 {
    text-align: center;
    margin-bottom: 48px;
    font-size: 32px;
    font-weight: 700;
}

.tips-carousel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.tip-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.tip-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 20px;
}

.tip-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.tip-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .knowledge-hub {
        padding: 60px 0;
    }
    
    .knowledge-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 32px;
    }
    
    .knowledge-card.featured {
        grid-column: span 1;
    }
    
    .knowledge-card {
        padding: 24px;
    }
    
    .quick-tips {
        padding: 60px 0;
    }
    
    .quick-tips h2 {
        font-size: 24px;
        margin-bottom: 32px;
    }
    
    .tips-carousel {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .tip-card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .knowledge-card {
        padding: 20px;
    }
    
    .knowledge-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .knowledge-card h3 {
        font-size: 18px;
    }
    
    .tip-icon {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}