/* German Repetition Training - Homepage Styles */

:root {
    --primary-blue: #0066cc;
    --primary-dark: #004080;
    --primary-light: #3385d6;
    --accent-orange: #ff6b35;
    --accent-green: #00cc88;
    --neutral-100: #f8f9fa;
    --neutral-200: #e9ecef;
    --neutral-700: #495057;
    --neutral-900: #212529;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--neutral-900);
    overflow-x: hidden;
}

/* Scroll reveal animations */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-scale {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.reveal-scale.active {
    opacity: 1;
    transform: scale(1);
}

.stagger-delay-1 { transition-delay: 0.1s; }
.stagger-delay-2 { transition-delay: 0.2s; }
.stagger-delay-3 { transition-delay: 0.3s; }
.stagger-delay-4 { transition-delay: 0.4s; }

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 6rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

/* Animated gradient background */
.hero-section::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

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

.hero-title, .hero-subtitle {
    animation: fadeInUp 1s ease-out forwards;
    opacity: 0;
}

.hero-subtitle {
    animation-delay: 0.2s;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    opacity: 0.95;
    margin-bottom: 2rem;
}

/* Buttons */
.btn-primary-custom {
    background: var(--accent-orange);
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary-custom:hover {
    background: #ff5722;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.btn-outline-custom {
    border: 2px solid white;
    color: white;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    background: transparent;
    transition: all 0.3s ease;
}

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

/* Feature Cards */
.feature-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--neutral-200);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-light) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.feature-card > * {
    position: relative;
    z-index: 1;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(0, 102, 204, 0.15);
    border-color: var(--primary-blue);
}

.feature-card:hover::before {
    opacity: 0.02;
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    color: white;
    position: relative;
    overflow: hidden;
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.feature-card:hover .feature-icon::before {
    left: 100%;
}

.feature-icon i {
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.feature-card:hover .feature-icon i {
    transform: rotateY(360deg) scale(1.1);
}

/* Section Styles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--neutral-900);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--neutral-700);
    margin-bottom: 3rem;
}

/* Benefit Items */
.benefit-item {
    display: flex;
    align-items: start;
    margin-bottom: 1.5rem;
}

.benefit-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-green), #00997a);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    margin-right: 1rem;
    font-size: 0.875rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(0, 204, 136, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(0, 204, 136, 0);
    }
}

/* Level Cards */
.level-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 2px solid var(--neutral-200);
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    perspective: 1000px;
}

.level-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.level-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(0, 102, 204, 0.05), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.level-card:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 15px 50px rgba(0, 102, 204, 0.2);
    transform: translateY(-8px) rotateX(2deg);
}

.level-card:hover::after {
    opacity: 1;
}

.level-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--neutral-100);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 1rem;
    color: var(--primary-blue);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #1DB954 0%, #1ed760 100%);
    color: white;
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
}

/* Stats Section */
.stats-section {
    background: var(--neutral-100);
    padding: 3rem 0;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-blue);
    line-height: 1;
    display: inline-block;
    transition: transform 0.3s ease;
}

.stat-item:hover .stat-number {
    transform: scale(1.15);
    color: var(--accent-orange);
}

.stat-label {
    font-size: 1rem;
    color: var(--neutral-700);
    margin-top: 0.5rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}