/* ================================================================
   INTcoin Website — Global Stylesheet
   Matches the explorer/faucet design language:
     - Dark theme (#0f0f23 background)
     - Cyan (#00d4ff) + Purple (#7c3aed) gradient accents
     - System font stack with monospace for addresses/hashes
   ================================================================ */

/* ----------------------------------------------------------------
   CSS Variables (Design Tokens)
   ---------------------------------------------------------------- */

:root {
    /* Backgrounds */
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);

    /* Text */
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    /* Accents */
    --accent-cyan: #00d4ff;
    --accent-blue: #0084ff;
    --accent-purple: #7c3aed;
    --accent-purple-dark: #4c1d95;
    --gradient-brand: linear-gradient(135deg, #00d4ff, #7c3aed);
    --gradient-brand-hover: linear-gradient(135deg, #00b8d9, #6b4ce6);

    /* Borders */
    --border-color: #27272a;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;

    /* Status */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.15);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-2xl: 64px;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
}

/* ----------------------------------------------------------------
   Reset & Base
   ---------------------------------------------------------------- */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                 'Helvetica Neue', Arial, sans-serif, system-ui;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ----------------------------------------------------------------
   Typography
   ---------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

h1 { font-size: 2.5em; }
h2 { font-size: 1.8em; }
h3 { font-size: 1.4em; }

.text-gradient {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-cyan { color: var(--accent-cyan); }
.text-center { text-align: center; }

.mono {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code',
                 'JetBrains Mono', monospace;
}

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color 0.2s, opacity 0.2s;
}

a:hover {
    text-decoration: underline;
    opacity: 0.9;
}

p {
    margin-bottom: var(--space-md);
}

/* ----------------------------------------------------------------
   Layout
   ---------------------------------------------------------------- */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-2xl) 0;
}

.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* ----------------------------------------------------------------
   Header / Navigation
   ---------------------------------------------------------------- */

.site-header {
    background: var(--bg-hero);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    font-size: 1.4em;
    font-weight: 700;
}

.logo:hover { text-decoration: none; opacity: 1; }

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-brand);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 800;
    color: white;
    letter-spacing: -0.5px;
}

.logo-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav a {
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--accent-cyan);
    text-decoration: none;
}

.nav a.active {
    color: var(--accent-cyan);
}

/* Mobile menu toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5em;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
    }
    .nav.open { display: flex; }
}

/* ----------------------------------------------------------------
   Hero Section
   ---------------------------------------------------------------- */

.hero {
    background: var(--bg-hero);
    padding: var(--space-2xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(
        circle at 30% 50%,
        rgba(0, 212, 255, 0.08) 0%,
        transparent 50%
    ),
    radial-gradient(
        circle at 70% 50%,
        rgba(124, 58, 237, 0.08) 0%,
        transparent 50%
    );
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.2em;
    margin-bottom: var(--space-md);
}

.hero p {
    font-size: 1.2em;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

/* ----------------------------------------------------------------
   Cards
   ---------------------------------------------------------------- */

.card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: var(--space-lg);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.card-flat {
    composes: card;
    transform: none !important;
    box-shadow: none !important;
}

.card-centered { text-align: center; }

/* ----------------------------------------------------------------
   Buttons
   ---------------------------------------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 28px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
    text-decoration: none;
}

.btn:hover {
    opacity: 0.9;
    text-decoration: none;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--gradient-brand);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
}

.btn-secondary:hover {
    background: rgba(0, 212, 255, 0.1);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.1em;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85em;
}

/* ----------------------------------------------------------------
   Stats / Feature Grid
   ---------------------------------------------------------------- */

.stat-value {
    font-size: 2em;
    color: var(--accent-cyan);
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9em;
    margin-top: var(--space-xs);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    margin-bottom: var(--space-md);
}

/* ----------------------------------------------------------------
   Badges
   ---------------------------------------------------------------- */

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success { background: var(--success); color: white; }
.badge-warning { background: var(--warning); color: black; }
.badge-error { background: var(--error); color: white; }
.badge-info { background: var(--accent-blue); color: white; }
.badge-purple { background: var(--accent-purple); color: white; }

/* ----------------------------------------------------------------
   Tables
   ---------------------------------------------------------------- */

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    font-size: 0.85em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

.table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background: rgba(0, 212, 255, 0.03);
}

/* ----------------------------------------------------------------
   Footer
   ---------------------------------------------------------------- */

.site-footer {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-2xl);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.85em;
}

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

.footer-social {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.footer-social a {
    color: var(--text-secondary);
    font-size: 1.2em;
}

.footer-social a:hover {
    color: var(--accent-cyan);
}

/* ----------------------------------------------------------------
   Utility Classes
   ---------------------------------------------------------------- */

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

.hidden { display: none; }

/* ----------------------------------------------------------------
   Animations
   ---------------------------------------------------------------- */

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.animate-in {
    animation: fadeIn 0.5s ease-out forwards;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* ----------------------------------------------------------------
   Responsive
   ---------------------------------------------------------------- */

@media (max-width: 768px) {
    h1 { font-size: 1.8em; }
    h2 { font-size: 1.4em; }

    .hero h1 { font-size: 2.2em; }
    .hero p { font-size: 1em; }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .container, .container-narrow {
        padding: 0 var(--space-md);
    }

    .section {
        padding: var(--space-xl) 0;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 1em;
    }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.8em; }

    .stat-value { font-size: 1.5em; }

    .footer-links {
        flex-direction: column;
        gap: var(--space-sm);
    }
}