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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #10b981;
    --accent: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;
    --gray: #64748b;
    --light: #f8fafc;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-gold: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark);
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--dark);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

/* Page Header */
.page-header {
    margin-top: 80px;
    background: var(--gradient);
    padding: 5rem 2rem 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.05"><path d="M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z"/></g></g></svg>');
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translateX(0) translateY(0) rotate(0deg); }
    100% { transform: translateX(-100px) translateY(-100px) rotate(360deg); }
}

.page-header h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
    animation: fadeInUp 0.8s ease;
}

.page-header p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.3rem;
    position: relative;
    animation: fadeInUp 0.8s ease 0.2s both;
}

@keyframes fadeInUp {
    0% { transform: translateY(30px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

/* Stats Section */
.stats-section {
    padding: 3rem 2rem;
    background: white;
    border-bottom: 1px solid var(--light);
}

.stats-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
    background: var(--light);
    border-radius: 20px;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray);
    font-size: 1rem;
}

/* Reviews Grid */
.reviews-section {
    padding: 4rem 2rem;
    background: var(--light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 0.75rem 1.5rem;
    background: white;
    border: 2px solid transparent;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-tab:hover {
    border-color: var(--primary);
}

.filter-tab.active {
    background: var(--gradient);
    color: white;
    border-color: transparent;
}

.reviews-grid {
    display: grid;
    gap: 2rem;
}

.review-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.reviewer-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.reviewer-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
}

.reviewer-details h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.reviewer-meta {
    display: flex;
    gap: 1rem;
    color: var(--gray);
    font-size: 0.9rem;
}

.review-rating {
    display: flex;
    gap: 0.25rem;
}

.star {
    color: #fbbf24;
    font-size: 1.2rem;
}

.review-category {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--light);
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 1rem;
}

.review-content {
    margin-bottom: 1.5rem;
}

.review-problem {
    margin-bottom: 1rem;
    padding: 1rem;
    background: #fef2f2;
    border-left: 4px solid var(--danger);
    border-radius: 10px;
}

.review-problem h4 {
    color: var(--danger);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.review-solution {
    margin-bottom: 1rem;
    padding: 1rem;
    background: #f0fdf4;
    border-left: 4px solid var(--secondary);
    border-radius: 10px;
}

.review-solution h4 {
    color: var(--secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.review-text {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 1rem;
}

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

.review-helpful {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.helpful-button {
    padding: 0.5rem 1rem;
    background: var(--light);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.helpful-button:hover {
    background: var(--primary);
    color: white;
}

.verified-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.8rem;
    background: #dbeafe;
    color: var(--primary);
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Video Reviews */
.video-reviews-section {
    padding: 4rem 2rem;
    background: white;
}

.video-reviews-section .container {
    max-width: 500px;
    margin: 0 auto;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.video-card {
    background: var(--light);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.video-placeholder {
    height: 300px;
    background: var(--gradient);
    position: relative;
    overflow: hidden;
    border-radius: 20px 20px 0 0;
}

.video-placeholder video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.play-icon {
    width: 60px;
    height: 60px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.video-card:hover .play-icon {
    transform: scale(1.1);
}

.play-triangle {
    width: 0;
    height: 0;
    border-left: 20px solid var(--primary);
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    margin-left: 5px;
}

.video-info {
    padding: 1.5rem;
}

.video-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.video-author {
    color: var(--gray);
    font-size: 0.9rem;
}

/* CTA Section */
.cta-section {
    background: var(--gradient);
    padding: 4rem 2rem;
    text-align: center;
    margin-top: 4rem;
}

.cta-section h2 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.btn-white {
    background: white;
    color: var(--primary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    padding: 3rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    color: rgba(255, 255, 255, 0.7);
}

/* Mobile */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .page-header h1 {
        font-size: 2rem;
    }

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

    .review-header {
        flex-direction: column;
        gap: 1rem;
    }

    .review-footer {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}