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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background-color: #1a1a1a;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo img {
    height: 50px;
}

.logo-text {
    color: #fff;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #ff6b35;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 70px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.tagline {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background-color: #ff6b35;
    color: white;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.app-showcase {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    padding: 80px 0;
}

.app-showcase .container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.showcase-category {
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1.5rem;
    cursor: grab;
    user-select: none;
}

.showcase-category:active {
    cursor: grabbing;
}

.category-title {
    color: #fff;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 600;
    text-align: center;
}

.book-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    overflow: hidden;
}

.category-images {
    position: relative;
    width: 100%;
    height: 500px;
    overflow: visible;
}

.showcase-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: left center;
}

.showcase-item.active {
    z-index: 10;
    transform: translateX(0) scale(1);
    opacity: 1;
}

.showcase-item.stacked {
    z-index: 1;
    transform: translateX(-10px) scale(0.95);
    opacity: 0.3;
    pointer-events: none;
}

.showcase-item.sliding-left {
    animation: slideToBack 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.showcase-item.sliding-right {
    animation: slideToFront 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideToBack {
    0% {
        transform: translateX(0) scale(1);
        opacity: 1;
        z-index: 10;
    }
    50% {
        transform: translateX(50%) scale(0.9);
        opacity: 0.5;
    }
    100% {
        transform: translateX(-10px) scale(0.95);
        opacity: 0.3;
        z-index: 1;
    }
}

@keyframes slideToFront {
    0% {
        transform: translateX(-10px) scale(0.95);
        opacity: 0.3;
        z-index: 1;
    }
    50% {
        transform: translateX(-50%) scale(0.9);
        opacity: 0.5;
    }
    100% {
        transform: translateX(0) scale(1);
        opacity: 1;
        z-index: 10;
    }
}

.showcase-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
}

.book-nav {
    display: none;
}

.page-indicator {
    text-align: center;
    color: #fff;
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.features {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a1a1a;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.how-it-works {
    padding: 80px 0;
    background-color: white;
}

.how-it-works h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a1a1a;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.step h3 {
    margin-bottom: 1rem;
    color: #1a1a1a;
}

.coaching {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.coaching h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a1a1a;
}

.coach-spotlight {
    display: flex;
    gap: 3rem;
    align-items: center;
    background: white;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.coach-image {
    width: 300px;
    height: 300px;
    object-fit: cover;
    border-radius: 10px;
}

.coach-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #667eea;
}

.coach-info p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.download {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.download p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
}

.download-buttons {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-block;
    background-color: white;
    color: #667eea;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

footer {
    background-color: #1a1a1a;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-links {
    margin-top: 1rem;
}

.privacy-link {
    color: #667eea;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.privacy-link:hover {
    color: #ff6b35;
    text-decoration: underline;
}

@media (max-width: 1200px) {
    .app-showcase .container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1.2rem;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 1rem;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    .app-showcase .container {
        grid-template-columns: 1fr;
    }
    
    .category-images {
        height: 400px;
    }
    
    .book-container {
        min-height: 400px;
    }
    
    .category-title {
        font-size: 1.2rem;
    }
    
    .coach-spotlight {
        flex-direction: column;
        text-align: center;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 300px;
    }
}