/* CSS Custom Properties for Theming */
:root {
    /* Light theme (default) */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a2e;
    --color-text-secondary: #6c757d;
    --color-border: #e9ecef;
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-card-bg: #ffffff;
    --color-card-shadow: rgba(0, 0, 0, 0.08);
    --color-ad-bg: #f1f3f4;
    --color-ad-border: #dadce0;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* Dark theme */
[data-theme="dark"] {
    --color-bg: #0f0f1a;
    --color-bg-secondary: #1a1a2e;
    --color-text: #f8f9fa;
    --color-text-secondary: #9ca3af;
    --color-border: #2d2d44;
    --color-primary: #818cf8;
    --color-primary-hover: #a5b4fc;
    --color-success: #34d399;
    --color-danger: #f87171;
    --color-card-bg: #1a1a2e;
    --color-card-shadow: rgba(0, 0, 0, 0.3);
    --color-ad-bg: #1a1a2e;
    --color-ad-border: #2d2d44;
}

/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-text);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

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

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--color-border);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: block;
}

/* Main Content */
.main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

/* Wake Lock Panel */
.wake-lock-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.wake-lock-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 180px;
    height: 180px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: white;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 10px 40px rgba(79, 70, 229, 0.3);
}

.wake-lock-button:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 50px rgba(79, 70, 229, 0.4);
}

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

.wake-lock-button.active {
    background: linear-gradient(135deg, var(--color-success), #059669);
    box-shadow: 0 10px 40px rgba(16, 185, 129, 0.3);
}

.wake-lock-button.active:hover {
    box-shadow: 0 15px 50px rgba(16, 185, 129, 0.4);
}

.button-icon svg {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-sm);
}

.button-text {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Status */
.status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    transition: background-color var(--transition-normal);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-text-secondary);
    transition: background-color var(--transition-fast);
}

.status.active .status-dot {
    background-color: var(--color-success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Browser Support */
.browser-support {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: background-color var(--transition-normal);
}

.browser-support.unsupported {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

.browser-support:empty {
    display: none;
}

/* Content with Sidebar */
.content-with-sidebar {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

@media (min-width: 900px) {
    .content-with-sidebar {
        grid-template-columns: 1fr 300px;
    }
}

/* Features Section */
.features {
    margin-bottom: var(--spacing-2xl);
}

.features h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-normal), border-color var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--color-card-shadow);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    transition: background-color var(--transition-normal);
}

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

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Downloads Section */
.downloads {
    margin-bottom: var(--spacing-xl);
}

.downloads h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.downloads-subtitle {
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.download-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.download-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-normal), border-color var(--transition-normal);
    min-width: 200px;
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--color-card-shadow);
    color: var(--color-text);
}

.download-button svg {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.download-button span {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.download-button strong {
    font-size: 1rem;
}

.download-button small {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.download-windows svg {
    color: #0078d4;
}

.download-macos svg {
    color: var(--color-text);
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: calc(60px + var(--spacing-xl));
    height: fit-content;
}

/* Ad Slots */
.ad-slot {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-ad-bg);
    border: 1px dashed var(--color-ad-border);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.ad-placeholder-text {
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ad-slot-header {
    width: 200px;
    height: 50px;
}

.ad-slot-sidebar {
    width: 100%;
    height: 250px;
}

.ad-slot-content {
    width: 100%;
    height: 90px;
    margin-top: var(--spacing-lg);
}

@media (max-width: 768px) {
    .ad-slot-header {
        display: none;
    }
}

/* Footer */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-content p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-nav a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.footer-nav a:hover {
    color: var(--color-primary);
}

/* Pro Badge */
.pro-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: white;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* Upgrade Link */
.upgrade-link {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.upgrade-link:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

/* Timer Section */
.timer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
    width: 100%;
    max-width: 300px;
    transition: opacity var(--transition-fast);
}

.timer-section.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.timer-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.9375rem;
}

.timer-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.timer-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.timer-input-group input[type="number"] {
    width: 70px;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    text-align: center;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
}

.timer-input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--color-primary);
}

.timer-input-group input[type="number"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.timer-input-group span {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.pro-required {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: var(--spacing-xs);
}

.pro-required a {
    color: var(--color-primary);
    font-weight: 500;
}

.timer-section.pro .pro-required {
    display: none;
}

/* Hide ads for Pro users */
body.pro-user .ad-slot {
    display: none !important;
}

/* Responsive Adjustments */
@media (max-width: 600px) {
    .header-content {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .main {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .hero {
        padding: var(--spacing-lg) 0;
    }

    .wake-lock-button {
        width: 150px;
        height: 150px;
    }

    .button-icon svg {
        width: 36px;
        height: 36px;
    }

    .button-text {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}