@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap');

:root {
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --body: #f8f9fa;
  --primary: #1a73e8;
  --primary-hover: #1557b0;
  --surface: #ffffff;
  --surface-variant: #f1f3f4;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-tertiary: #9aa0a6;
  --border: #dadce0;
  --success: #34a853;
  --warning: #ffa000;
  --error: #ea4335;
  --shadow-1: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
  --shadow-2: 0 2px 6px 2px rgba(60, 64, 67, 0.15), 0 8px 24px 4px rgba(60, 64, 67, 0.15);
  --shadow-3: 0 4px 8px 3px rgba(60, 64, 67, 0.15), 0 1px 3px 0 rgba(60, 64, 67, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--body);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--surface);
    box-shadow: var(--shadow-1);
    min-height: 100vh;
    position: relative;
}

.header { 
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-actions {
    display: flex;
    gap: 8px;
}

.header button { 
    background: none;
    border: none;
    padding: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.header button:hover {
    background-color: var(--surface-variant);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.header button svg {
    width: 20px;
    height: 20px;
}

.app-info {
    display: flex;
    align-items: flex-start;
    padding: 24px;
    gap: 20px;
}

.app-icon {
    flex-shrink: 0;
}

.app-icon img {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-1);
    transition: var(--transition);
}

.app-icon img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-2);
}

.app-details { 
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.app-title {
    font-weight: 700;
    font-size: 24px;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 4px;
}

.publisher {
    font-weight: 500;
    font-size: 14px;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
}

.verified-badge {
    color: var(--success);
    display: flex;
    align-items: center;
}

.verified-badge svg {
    width: 16px;
    height: 16px;
}

.app-category {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.app-category svg {
    width: 14px;
    height: 14px;
}

.stats-container {
    padding: 0 24px;
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.stat-item {
    background: var(--surface);
    padding: 20px 16px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: var(--transition);
}

.stat-item:hover {
    background: var(--surface-variant);
}

.stat-value {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-weight: 700;
    font-size: 18px;
    color: var(--text-primary);
}

.stat-value svg {
    width: 18px;
    height: 18px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.action-buttons {
    padding: 0 24px 24px;
    display: flex;
    gap: 12px;
}

.download-btn { 
    flex: 1;
    text-decoration: none;
    color: white;
    padding: 16px 24px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.download-btn:hover::before {
    left: 100%;
}

.download-btn:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-2);
    transform: translateY(-2px);
}

.download-btn svg {
    width: 18px;
    height: 18px;
}

.wishlist-btn, .share-alt-btn {
    padding: 16px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.wishlist-btn:hover, .share-alt-btn:hover {
    background: var(--surface-variant);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
}

.wishlist-btn svg, .share-alt-btn svg {
    width: 20px;
    height: 20px;
}

.section {
    padding: 32px 24px;
    border-top: 1px solid var(--border);
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.about-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.feature-card {
    padding: 20px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.05) 0%, rgba(26, 115, 232, 0.02) 100%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(26, 115, 232, 0.1);
    transition: var(--transition);
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2);
    border-color: rgba(26, 115, 232, 0.2);
}

.feature-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.feature-icon svg {
    width: 20px;
    height: 20px;
}

.feature-content {
    flex: 1;
}

.feature-title {
    font-weight: 700;
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.security-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: linear-gradient(135deg, rgba(52, 168, 83, 0.1) 0%, rgba(52, 168, 83, 0.05) 100%);
    border: 1px solid rgba(52, 168, 83, 0.2);
    border-radius: 20px;
    margin-top: 24px;
    width: fit-content;
    transition: var(--transition);
}

.security-badge:hover {
    transform: scale(1.02);
}

.security-badge svg {
    width: 18px;
    height: 18px;
    color: var(--success);
}

.security-text {
    font-size: 13px;
    color: var(--success);
    font-weight: 700;
    letter-spacing: 0.5px;
}

.screenshots {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    padding: 8px 0;
    scroll-behavior: smooth;
}

.screenshots::-webkit-scrollbar {
    height: 6px;
}

.screenshots::-webkit-scrollbar-track {
    background: var(--surface-variant);
    border-radius: 3px;
}

.screenshots::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 3px;
}

.screenshot-item {
    flex-shrink: 0;
    width: 180px;
    height: 320px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-1);
    transition: var(--transition);
    position: relative;
    cursor: pointer;
}

.screenshot-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-2);
}

.screenshot-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.screenshot-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    color: white;
}

.screenshot-item:hover .screenshot-overlay {
    opacity: 1;
}

.screenshot-overlay svg {
    width: 32px;
    height: 32px;
}

.review-summary {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 32px;
    margin-top: 20px;
}

.rating-overview {
    text-align: center;
}

.overall-rating {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.stars {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 8px;
}

.stars svg {
    width: 20px;
    height: 20px;
}

.total-reviews {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.rating-bars {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rating-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
}

.rating-bar span:first-child {
    width: 12px;
    text-align: center;
    color: var(--text-secondary);
    font-weight: 500;
}

.bar {
    flex: 1;
    height: 8px;
    background: var(--surface-variant);
    border-radius: 4px;
    overflow: hidden;
}

.fill {
    height: 100%;
    background: var(--warning);
    border-radius: 4px;
    transition: width 1s ease-out;
}

.rating-bar span:last-child {
    width: 30px;
    text-align: right;
    color: var(--text-secondary);
    font-size: 12px;
}

.metadata {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 20px;
}

.metadata-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.metadata-item:hover {
    background: var(--surface-variant);
    margin: 0 -16px;
    padding: 16px;
    border-radius: var(--radius-sm);
    border-bottom: 1px solid transparent;
}

.metadata-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.metadata-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 700;
}

.similar-apps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.similar-app {
    padding: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
    cursor: pointer;
}

.similar-app:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-1);
    border-color: var(--primary);
}

.similar-app img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

.similar-app-info {
    flex: 1;
}

.similar-app-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.similar-app-rating {
    font-size: 12px;
    color: var(--text-secondary);
}

.floating-action {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    color: white;
    box-shadow: var(--shadow-2);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab:hover {
    transform: scale(1.1);
    background: var(--primary-hover);
}

.fab svg {
    width: 24px;
    height: 24px;
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: white;
    padding: 16px 24px;
    border-radius: 28px;
    z-index: 1001;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    font-size: 14px;
    box-shadow: var(--shadow-2);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1002;
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: var(--transition);
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

@media (max-width: 768px) {
    .container {
        margin: 0;
        box-shadow: none;
    }
    
    .app-info {
        padding: 20px;
    }
    
    .app-title {
        font-size: 20px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .metadata {
        grid-template-columns: 1fr;
    }
    
    .review-summary {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .similar-apps {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: 24px 20px;
    }
    
    .action-buttons {
        padding: 0 20px 20px;
    }
    
    .floating-action {
        bottom: 16px;
        right: 16px;
    }
}