/* ========================================
   Reset & Base Styles
   ======================================== */

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

:root {
    /* Light Mode Colors */
    --bg-primary: #fafafa;
    --bg-gradient-1: #667eea;
    --bg-gradient-2: #764ba2;
    --bg-gradient-3: #f093fb;
    --bg-gradient-4: #4facfe;
    --bg-card: rgba(255, 255, 255, 0.7);
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --border-color: rgba(255, 255, 255, 0.3);
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-colored: rgba(102, 126, 234, 0.3);
    --hover-bg: rgba(255, 255, 255, 0.5);
    --github-color: #1a1a2e;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
body.dark-mode {
    --bg-primary: #0f0f23;
    --bg-gradient-1: #4c1d95;
    --bg-gradient-2: #581c87;
    --bg-gradient-3: #5b21b6;
    --bg-gradient-4: #1e3a8a;
    --bg-card: rgba(30, 30, 46, 0.7);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: rgba(0, 0, 0, 0.5);
    --shadow-colored: rgba(76, 29, 149, 0.5);
    --hover-bg: rgba(255, 255, 255, 0.05);
    --github-color: #e2e8f0;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Respect system preference by default */
@media (prefers-color-scheme: dark) {
    body:not(.light-mode) {
        --bg-primary: #0f0f23;
        --bg-gradient-1: #4c1d95;
        --bg-gradient-2: #581c87;
        --bg-gradient-3: #5b21b6;
        --bg-gradient-4: #1e3a8a;
        --bg-card: rgba(30, 30, 46, 0.7);
        --text-primary: #e2e8f0;
        --text-secondary: #94a3b8;
        --border-color: rgba(255, 255, 255, 0.1);
        --shadow: rgba(0, 0, 0, 0.5);
        --shadow-colored: rgba(76, 29, 149, 0.5);
        --hover-bg: rgba(255, 255, 255, 0.05);
        --github-color: #e2e8f0;
        --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(at 0% 0%, var(--bg-gradient-1) 0px, transparent 50%),
        radial-gradient(at 100% 0%, var(--bg-gradient-2) 0px, transparent 50%),
        radial-gradient(at 100% 100%, var(--bg-gradient-3) 0px, transparent 50%),
        radial-gradient(at 0% 100%, var(--bg-gradient-4) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, var(--bg-gradient-1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, var(--bg-gradient-2) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, var(--bg-gradient-3) 0%, transparent 50%);
    opacity: 0.3;
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.4;
        transform: scale(1.1);
    }
}

/* ========================================
   Container
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header
   ======================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px var(--shadow);
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--github-color);
    background: var(--hover-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    text-decoration: none;
    cursor: pointer;
    padding: 0;
    font-family: inherit;
}

.control-btn:hover {
    background: var(--bg-card);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 16px var(--shadow-colored);
}

.control-btn:active {
    transform: translateY(0) scale(0.98);
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

/* Theme toggle icons */
#theme-toggle {
    position: relative;
}

.sun-icon,
.moon-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

/* Light mode - show sun icon */
body.light-mode .sun-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

body.light-mode .moon-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(180deg);
}

/* Dark mode - show moon icon */
body.dark-mode .sun-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(-180deg);
}

body.dark-mode .moon-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

/* Auto mode - follow system preference */
body:not(.light-mode):not(.dark-mode) .sun-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

body:not(.light-mode):not(.dark-mode) .moon-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(180deg);
}

@media (prefers-color-scheme: dark) {
    body:not(.light-mode):not(.dark-mode) .sun-icon {
        opacity: 0;
        transform: translate(-50%, -50%) rotate(-180deg);
    }

    body:not(.light-mode):not(.dark-mode) .moon-icon {
        opacity: 1;
        transform: translate(-50%, -50%) rotate(0deg);
    }
}

/* Language toggle */
.lang-text {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* GitHub link in controls */
.header-controls .github-link {
    width: 44px;
    height: 44px;
}

/* ========================================
   Main Content
   ======================================== */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* ========================================
   Apps Grid
   ======================================== */

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .apps-grid {
        gap: var(--spacing-xl);
    }
}

/* ========================================
   App Card
   ======================================== */

.app-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all var(--transition-slow);
    box-shadow: 0 8px 32px var(--shadow);
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-slow);
    z-index: -1;
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px var(--shadow-colored);
    border-color: rgba(102, 126, 234, 0.5);
}

.app-card:hover::before {
    opacity: 0.05;
}

.app-icon {
    width: 120px;
    height: 120px;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 8px 24px var(--shadow-colored);
    transition: all var(--transition-normal);
    position: relative;
}

.app-card:hover .app-icon {
    transform: scale(1.05);
    box-shadow: 0 12px 32px var(--shadow-colored);
}

.app-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.app-name {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.app-description {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
    opacity: 0.9;
}

.app-features {
    margin-bottom: var(--spacing-lg);
    width: 100%;
}

.app-features ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}

.app-features li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.4;
}

.app-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--bg-gradient-1);
    font-weight: 600;
}

/* ========================================
   Store Badges
   ======================================== */

.store-badges {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-md);
    align-items: center;
    justify-content: center;
    width: 100%;
}

.store-icon-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--hover-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    text-decoration: none;
    color: var(--text-primary);
}

.store-icon-link:hover {
    background: var(--bg-card);
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 12px 24px var(--shadow-colored);
    border-color: rgba(102, 126, 234, 0.5);
}

.store-icon-link:active {
    transform: translateY(-2px) scale(1.05);
}

.store-icon-link svg {
    width: 28px;
    height: 28px;
}

/* Icon colors */
.store-icon-link.apple-store {
    color: var(--text-primary);
}

.store-icon-link.google-play svg {
    /* Preserve SVG fill colors for Google Play */
}

body.dark-mode .store-icon-link {
    background: rgba(255, 255, 255, 0.05);
}

body.dark-mode .store-icon-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

@media (prefers-color-scheme: dark) {
    body:not(.light-mode) .store-icon-link {
        background: rgba(255, 255, 255, 0.05);
    }

    body:not(.light-mode) .store-icon-link:hover {
        background: rgba(255, 255, 255, 0.1);
    }
}

/* ========================================
   AdSense Container
   ======================================== */

.adsense-container {
    max-width: 728px;
    margin: var(--spacing-xxl) auto;
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px var(--shadow);
}

/* AdSense ins element sizing */
.adsbygoogle {
    width: 100%;
    min-width: 300px;
    min-height: 90px;
}

/* Hide AdSense placeholder comment in production */
.adsense-container:empty::before {
    content: '';
}

/* ========================================
   Footer
   ======================================== */

.footer {
    margin-top: var(--spacing-xxl);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.footer-links {
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.footer-links .separator {
    color: var(--border-color);
}

/* ========================================
   Floating Contact Button
   ======================================== */

.floating-contact-btn {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 64px;
    height: 64px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px var(--shadow-colored);
    text-decoration: none;
    transition: all var(--transition-normal);
    z-index: 1000;
    animation: float 3s ease-in-out infinite;
}

.floating-contact-btn:hover {
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 12px 32px var(--shadow-colored);
}

.floating-contact-btn:active {
    transform: translateY(-2px) scale(1.05);
}

.floating-contact-btn svg {
    width: 28px;
    height: 28px;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

/* ========================================
   Responsive Adjustments
   ======================================== */

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    .header {
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-md) 0;
    }

    .floating-contact-btn {
        width: 56px;
        height: 56px;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }

    .floating-contact-btn svg {
        width: 24px;
        height: 24px;
    }

    .logo {
        font-size: 1.5rem;
    }

    .control-btn,
    .header-controls .github-link {
        width: 40px;
        height: 40px;
    }

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

    .lang-text {
        font-size: 0.7rem;
    }

    .app-card {
        padding: var(--spacing-lg);
    }

    .app-icon {
        width: 100px;
        height: 100px;
    }

    .app-name {
        font-size: 1.25rem;
    }

    .app-description {
        font-size: 0.875rem;
    }

    .store-icon-link {
        width: 48px;
        height: 48px;
    }

    .store-icon-link svg {
        width: 24px;
        height: 24px;
    }

    .adsense-container {
        padding: var(--spacing-md);
        margin: var(--spacing-xl) auto;
    }
}

@media (max-width: 360px) {
    .app-icon {
        width: 80px;
        height: 80px;
    }

    .app-name {
        font-size: 1.125rem;
    }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for keyboard navigation */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .github-link,
    .adsense-container,
    .store-badges {
        display: none;
    }

    .app-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}