/* --- CSS Variables --- */
:root {
    --color-primary: #667eea;
    --color-secondary: #1E293B;
    --color-accent: #34c759;
    --color-text-dark: #1d1d1f;
    --color-text-light: #ffffff;
    --color-subtle-text: #86868b;
    --color-light-background: #f5f7fa;
    --color-medium-background: #c3cfe2;
    --color-white: #ffffff;
    --color-light-gray: #f9f9f9;
    --color-border: #e5e5e7;
    --color-star: #ffd700;
    --color-info-background: #f0f8ff;
    --color-info-border: #e3f2fd;
    --color-info-icon: #2196f3;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    --spacing-3xl: 32px;
    --spacing-4xl: 48px;

    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-xxl: 22px;
    --font-size-3xl: 24px;
    --font-size-4xl: 32px;
    --font-size-5xl: 48px;

    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 22px;
    --border-radius-pill: 25px;

    --shadow-sm: 0 4px 20px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 32px rgba(0,0,0,0.2);
    --shadow-lg: 0 16px 64px rgba(0,0,0,0.3);

    --transition-speed: 0.3s;
    --transition-timing: ease;
    --transition-cubic-bezier: cubic-bezier(0.4, 0, 0.2, 1);

    --scroll-progress: 0%;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--color-light-background) 0%, var(--color-medium-background) 100%);
    min-height: 100vh;
    color: var(--color-text-dark);
    line-height: 1.6;
}

/* Scroll progress bar */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: var(--scroll-progress);
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-developer-accent));
    z-index: 9999;
    transition: width 0.1s var(--transition-timing);
}

/* --- Container --- */
.app-store-container {
    max-width: 980px;
    margin: 0 auto;
    background: var(--color-white);
    min-height: 100vh;
    box-shadow: 0 0 50px rgba(0,0,0,0.1);
}

/* --- Header Section --- */
.app-header {
    padding: var(--spacing-xxl);
    border-bottom: 1px solid var(--color-border);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-text-light);
}

.app-header__content {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.app-header__icon {
    width: 120px;
    height: 120px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-5xl);
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
    overflow: hidden; /* Ensure image doesn't overflow rounded corners */
}

.app-header__icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius-xl);
}

.app-header__info {
    flex: 1;
}

.app-header__title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.app-header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.app-header__developer {
    font-size: var(--font-size-md);
    opacity: 0.8;
    margin-bottom: var(--spacing-lg);
}

.app-header__rating {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.app-header__score {
    font-size: var(--font-size-3xl);
    font-weight: 700;
}

.stars {
    color: var(--color-star);
}

.stars--large {
    font-size: var(--font-size-xl);
}

.app-header__rating-count {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.app-header__size-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.button--primary {
    background-color: var(--color-accent);
    border: 2px solid rgba(var(--color-white-rgb), 0.3); /* Using RGB for transparency */
    color: var(--color-white);
    padding: 14px 32px;
    border-radius: var(--border-radius-pill);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) var(--transition-timing);
    backdrop-filter: blur(10px);
    text-decoration: none; /* Remove underline for links */
    display: inline-block; /* Allow padding and margin */
    text-align: center;
}

.button--primary:hover {
    background: rgba(var(--color-white-rgb), 0.3);
    transform: translateY(-2px);
}

.button--primary:active {
    transform: scale(0.98);
}

.app-header__badges {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.badge {
    background: rgba(var(--color-white-rgb), 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-xs);
    font-weight: 500;
    backdrop-filter: blur(10px);
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xxl); /* Add some space from the header content */
    margin-bottom: var(--spacing-xxl);
}

.stat-card {
    text-align: center;
    background: rgba(var(--color-white-rgb), 0.15);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    backdrop-filter: blur(8px);
}

.stat-card__number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.stat-card__label {
    font-size: var(--font-size-xs);
    opacity: 0.85;
}

/* --- Content Sections --- */
.content-section {
    padding: var(--spacing-3xl) var(--spacing-xxl);
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-dark);
}

.section-title--light {
    color: var(--color-text-light);
}

.section-description {
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-dark);
    font-size: var(--font-size-md);
}

/* --- Screenshots Section --- */
.screenshots-container {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth; /* Changed to smooth for better UX */
    padding-bottom: var(--spacing-md);
    position: relative; /* For scroll indicator */
}

.screenshots-container::-webkit-scrollbar {
    height: 8px;
}

.screenshots-container::-webkit-scrollbar-track {
    background: var(--color-border);
    border-radius: var(--border-radius-sm);
}

.screenshots-container::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--border-radius-sm);
}

.scroll-indicator::after {
    content: "Scroll for more →";
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.7);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    pointer-events: none;
    opacity: 0.8;
    animation: pulse 1.5s infinite; /* Added pulse animation */
}

.screenshot-item {
    flex-shrink: 0;
    width: 200px;
    height: 432px;
    transition: all var(--transition-speed) var(--transition-cubic-bezier);
    border-radius: var(--border-radius-xl); /* Added border-radius here */
    box-shadow: 0 8px 32px rgba(0,0,0,0.2); /* Initial shadow for consistency */
    overflow: hidden; /* Ensures image respects border-radius */
}

.screenshot-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: var(--border-radius-xl); /* Apply to image as well */
}

.screenshot-item:hover {
    transform: scale(1.05) rotateY(5deg);
    box-shadow: var(--shadow-lg);
}

/* --- Privacy Section --- */
.privacy-section {
    background: var(--color-info-background);
    border: 1px solid var(--color-info-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
}

.privacy-section__icon {
    color: var(--color-info-icon);
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

.privacy-section__title {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-dark);
    font-size: var(--font-size-lg);
}

.privacy-section__description {
    color: var(--color-subtle-text);
    line-height: 1.5;
    font-size: var(--font-size-md);
}

/* --- Features Grid --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-item {
    background: var(--color-light-gray);
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-speed) var(--transition-timing);
    animation: fadeInUp 0.6s var(--transition-timing) forwards; /* Applied directly for initial animation */
    opacity: 0; /* Hidden by default for animation */
}

.feature-item:hover {
    background: #f0f0f0; /* Slightly darker hover */
    transform: translateY(-4px);
}

.feature-item__icon {
    width: var(--spacing-4xl);
    height: var(--spacing-4xl);
    background: linear-gradient(45deg, var(--color-primary), var(--color-developer-accent));
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
}

.feature-item__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-dark);
}

.feature-item__description {
    color: var(--color-subtle-text);
    line-height: 1.5;
    font-size: var(--font-size-md);
}

/* --- Ratings & Reviews Section --- */
.ratings-reviews {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

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

.rating-summary__big-score {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-sm);
}

.rating-summary__subtitle {
    color: var(--color-subtle-text);
    margin-bottom: var(--spacing-lg);
}

.rating-summary__total-ratings {
    color: var(--color-subtle-text);
    margin-bottom: var(--spacing-lg);
}

.rating-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.rating-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.bar-fill {
    flex: 1;
    height: var(--spacing-sm);
    background: var(--color-border);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.bar-progress {
    height: 100%;
    background: #007aff; /* Specific color for progress bars */
    border-radius: var(--border-radius-sm);
    transition: width 0.8s var(--transition-timing);
}

.reviews-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xxl);
}

.review-item {
    padding: var(--spacing-xl);
    background: var(--color-light-gray);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-speed) var(--transition-timing);
}

.review-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.review-item__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.review-item__reviewer-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.reviewer-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(45deg, #ff9a9e, #fecfef);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--color-white);
}

.reviewer-name {
    font-weight: 600;
    color: var(--color-text-dark);
}

.review-item__date {
    font-size: var(--font-size-sm);
    color: var(--color-subtle-text);
}

.review-item__stars {
    color: var(--color-star);
}

.review-item__text {
    line-height: 1.6;
    color: var(--color-text-dark);
    max-height: 4.8em; /* Limit initial height */
    overflow: hidden;
    transition: max-height var(--transition-speed) var(--transition-timing);
}

.review-item.expanded .review-item__text {
    max-height: none;
    overflow: visible;
}

/* --- Info Section --- */
.info-section {
    background: var(--color-light-gray);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xxl);
}

.info-item {
    display: flex;
    flex-direction: column;
}

.info-item__label {
    font-size: var(--font-size-sm);
    color: var(--color-subtle-text);
    margin-bottom: var(--spacing-xs);
}

.info-item__value {
    font-size: var(--font-size-md);
    font-weight: 500;
    color: var(--color-text-dark);
}

/* --- Developer Section --- */
.developer-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, #764ba2 100%); /* Slightly different gradient */
    color: var(--color-text-light);
}

.developer-section__content {
    color: var(--color-white);
}

.developer-section__subtitle {
    margin-bottom: var(--spacing-xxl);
    opacity: 0.9;
    font-size: var(--font-size-md);
}

.developer-apps {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto;
    padding: var(--spacing-lg) 0;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

.developer-apps::-webkit-scrollbar {
    height: 8px;
}

.developer-apps::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
}

.developer-apps::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-sm);
}

.dev-app-item {
    min-width: 120px;
    text-align: center;
    cursor: pointer;
    transition: transform var(--transition-speed) var(--transition-timing);
    text-decoration: none; /* Remove underline for links */
}

.dev-app-item:hover {
    transform: scale(1.05);
}

.dev-app-item:hover .dev-app-item__icon {
    transform: scale(1.1) rotate(5deg);
    background: rgba(255,255,255,0.3);
}

.dev-app-item__icon {
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.2);
    border-radius: var(--border-radius-lg);
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    color: var(--color-white);
    transition: all var(--transition-speed) var(--transition-timing);
    overflow: hidden; /* Ensure image fits */
}

.dev-app-item__icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
}

.dev-app-item__name {
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

/* --- Floating Action Button (FAB) --- */
.fab {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 56px;
    height: 56px;
    background: linear-gradient(45deg, var(--color-primary), #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-3xl);
    font-weight: bold;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-speed) var(--transition-timing);
    opacity: 0;
    transform: translateY(20px);
    z-index: 1000;
}

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

@keyframes pulse {
    0% {
        transform: translateY(-50%) scale(1);
        opacity: 0.8;
    }
    50% {
        transform: translateY(-50%) scale(1.05);
        opacity: 1;
    }
    100% {
        transform: translateY(-50%) scale(1);
        opacity: 0.8;
    }
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .app-header__content {
        flex-direction: column;
        text-align: center;
        align-items: center; /* Center items in column layout */
    }

    .app-header__icon {
        margin-bottom: var(--spacing-lg); /* Add space below icon */
    }
    
    .ratings-reviews {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    .scroll-indicator::after {
        right: var(--spacing-md);
        padding: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 480px) {
    .app-header, .content-section {
        padding: var(--spacing-xxl) var(--spacing-lg); /* Adjust padding for smaller screens */
    }

    .app-header__title {
        font-size: var(--font-size-3xl);
    }
    
    .stat-card {
        padding: var(--spacing-lg);
    }
    
    .stat-card__number {
        font-size: var(--font-size-3xl);
    }
    
    .screenshot-item {
        width: 160px;
        height: 320px;
    }

    .fab {
        width: 48px;
        height: 48px;
        font-size: var(--font-size-xl);
    }
}

/* Helper for calc with CSS variables */
/* This is a common trick to get RGB values from hex for rgba() */
/* Make sure to define these in :root or adjust as needed for your base colors */
:root {
  --color-white-rgb: 255, 255, 255;
}