/**
 * Bitcoin Halving Countdown - Main Stylesheet
 * Modern, Bitcoin-themed design with dark theme
 */

/* CSS Variables for theming */
:root {
    --color-primary: #f7931a; /* Bitcoin orange */
    --color-primary-dark: #e8841a;
    --color-secondary: #ffb84d;
    --color-accent: #ffd700; /* Gold */
    --color-bg-dark: #0a0a0a;
    --color-bg-darker: #000000;
    --color-bg-card: #1a1a1a;
    --color-bg-card-hover: #252525;
    --color-text-primary: #ffffff;
    --color-text-secondary: #cccccc;
    --color-text-muted: #888888;
    --color-border: #333333;
    --color-success: #00ff88;
    --color-error: #ff4444;
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--color-bg-darker);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--color-primary);
    margin-top: var(--spacing-xl);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--color-secondary);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

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

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

/* Header */
.site-header {
    background: linear-gradient(180deg, rgba(247, 147, 26, 0.1) 0%, transparent 100%);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.site-header img {
    max-width: 200px;
    height: auto;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 0 20px rgba(247, 147, 26, 0.3));
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        filter: drop-shadow(0 0 20px rgba(247, 147, 26, 0.3));
    }
    50% {
        filter: drop-shadow(0 0 30px rgba(247, 147, 26, 0.6));
    }
}

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

/* Hero Section - Countdown */
.hero-section {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    background: radial-gradient(circle at center, rgba(247, 147, 26, 0.1) 0%, transparent 70%);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xxl);
}

.countdown-container {
    margin: var(--spacing-xl) 0;
}

.countdown-display {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin: var(--spacing-xl) 0;
}

.countdown-unit {
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    min-width: 120px;
    transition: var(--transition);
}

.countdown-unit:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(247, 147, 26, 0.2);
}

.countdown-value {
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.countdown-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.halving-date {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--color-secondary);
    margin-top: var(--spacing-lg);
    font-weight: 600;
}

/* Metrics Cards */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.metric-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--color-primary);
    transform: scaleY(0);
    transition: var(--transition);
}

.metric-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(247, 147, 26, 0.15);
}

.metric-card:hover::before {
    transform: scaleY(1);
}

.metric-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.metric-value {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
}

.metric-unit {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-left: 0.25rem;
}

/* Progress Bar */
.progress-section {
    margin: var(--spacing-xl) 0;
}

.progress-bar-container {
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
}

.progress-bar {
    width: 100%;
    height: 30px;
    background: var(--color-bg-darker);
    border-radius: 15px;
    overflow: hidden;
    position: relative;
    margin-top: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 15px;
    transition: width 0.5s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.progress-text {
    text-align: center;
    margin-top: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Content Sections */
.content-section {
    margin: var(--spacing-xxl) 0;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.content-section h2 {
    margin-top: 0;
}


/* FAQ Section */
.faq-list {
    list-style: none;
    margin-top: var(--spacing-lg);
}

.faq-item {
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-md);
}

.faq-question {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

.faq-answer {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* Footer */
.site-footer {
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-xxl);
}

.footer-content p {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-muted);
}

.footer-links {
    margin-top: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-secondary);
    margin: 0 var(--spacing-xs);
}

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

.footer-links .separator {
    color: var(--color-text-muted);
    margin: 0 var(--spacing-xs);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-xxl: 3rem;
    }
    
    .countdown-display {
        gap: var(--spacing-sm);
    }
    
    .countdown-unit {
        min-width: 100px;
        padding: var(--spacing-md);
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .content-section {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .countdown-unit {
        min-width: 80px;
        padding: var(--spacing-sm);
    }
    
    .countdown-value {
        font-size: 1.75rem;
    }
}

/* Loading State */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-primary {
    color: var(--color-primary);
}

.text-secondary {
    color: var(--color-secondary);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}