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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --border-color: #30363d;
    --accent-primary: #1f6feb;
    --accent-secondary: #58a6ff;
    --success: #3fb950;
    --danger: #f85149;
}

body.light {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --text-tertiary: #6e7681;
    --border-color: #d0d7de;
    --accent-primary: #0969da;
    --accent-secondary: #0a66dc;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem;
}

/* Navbar */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    padding: 0.75rem 2rem;
}

.navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
    min-width: fit-content;
}

.logo {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.navbar-tabs {
    display: flex;
    gap: 0.5rem;
    flex: 1;
}

.nav-tab {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
    border-radius: 0;
}

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

.nav-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.theme-btn {
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    color: var(--accent-primary);
}

/* Tab Sections */
.tab-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Header */
.home-header {
    margin-bottom: 2rem;
}

.home-header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.home-header p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Crypto Grid */
.crypto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* Crypto Card */
.crypto-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.crypto-card:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent-primary);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
}

.crypto-card h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.crypto-card .label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 1rem;
    display: block;
}

/* Price Section */
.price-section {
    margin: 1.25rem 0;
}

.crypto-card .price {
    font-size: 1.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-variant-numeric: tabular-nums;
}

.crypto-card .change {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    margin-top: 0.5rem;
}

.crypto-card .change.positive {
    background-color: rgba(63, 185, 80, 0.1);
    color: var(--success);
}

.crypto-card .change.negative {
    background-color: rgba(248, 81, 73, 0.1);
    color: var(--danger);
}

/* Stats Row */
.stats-row {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

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

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 3rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* API Documentation */
.api-content {
    max-width: 900px;
    margin: 0 auto;
}

.api-content h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.api-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.api-section-block {
    margin-bottom: 2rem;
}

.api-section-block h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.code-block {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    color: var(--accent-secondary);
    overflow-x: auto;
    white-space: pre;
    margin: 0.5rem 0;
}

.endpoint {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.endpoint-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.method {
    background-color: var(--accent-primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.path {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    color: var(--accent-secondary);
    font-weight: 600;
}

.endpoint p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

.endpoint ul {
    margin: 0.5rem 0 0 1.5rem;
    color: var(--text-secondary);
}

.endpoint li {
    margin: 0.3rem 0;
}

.endpoint code {
    background-color: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent-secondary);
}

.param {
    margin-top: 1rem !important;
}

.example {
    margin-top: 1rem !important;
}

.api-info {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.api-info p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .navbar .container {
        padding: 0.75rem 1rem;
    }

    .navbar-content {
        gap: 1rem;
    }

    .navbar-brand {
        gap: 0.5rem;
        font-size: 1rem;
    }

    .logo {
        width: 28px;
        height: 28px;
    }

    .navbar-tabs {
        gap: 0.25rem;
        flex: 0;
    }

    .nav-tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .theme-btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.8rem;
    }

    .crypto-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .home-header h1 {
        font-size: 1.5rem;
    }

    .api-content {
        margin: 0;
    }
}