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

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --accent: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

header {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: var(--gradient-1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 8px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

nav a:hover,
nav a.active {
    color: var(--text-primary);
    background: var(--bg-card);
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-outline:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.mobile-menu-btn {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
}

.hero {
    padding: 100px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 1; }
}

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

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero h1 span {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 20px;
    color: var(--primary-light);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-number {
    font-size: 40px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

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

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 24px;
}

.card-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

.card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

.card-link {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.forum-section {
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.forum-list {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.forum-item {
    display: flex;
    padding: 24px;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
    gap: 20px;
}

.forum-item:last-child {
    border-bottom: none;
}

.forum-item:hover {
    background: var(--bg-hover);
}

.forum-avatar {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    object-fit: cover;
    flex-shrink: 0;
}

.forum-main {
    flex: 1;
}

.forum-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
}

.forum-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 12px;
}

.forum-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.forum-tag {
    padding: 4px 10px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.forum-stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: right;
    color: var(--text-secondary);
    font-size: 14px;
    flex-shrink: 0;
}

.analytics-section {
    background: var(--bg-dark);
}

.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.chart-header h3 {
    font-size: 20px;
    font-weight: 700;
}

.chart-placeholder {
    width: 100%;
    height: 280px;
    background: var(--gradient-3);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: 600;
}

footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 24px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 15px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 8px 0;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
}

@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .chart-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .header-actions .btn-outline {
        display: none;
    }
    .hero h1 {
        font-size: 36px;
    }
    .hero p {
        font-size: 16px;
    }
    .section-header h2 {
        font-size: 28px;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .cards-grid {
        grid-template-columns: 1fr;
    }
    .forum-item {
        flex-direction: column;
    }
    .forum-stats {
        flex-direction: row;
        gap: 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.lazy-image {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.lazy-image.loaded {
    opacity: 1;
}