:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --accent: #10b981;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
}

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

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 30px 0;
}

.header-container {
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo-container {
    flex-shrink: 0;
}

.logo {
    max-height: 70px;
    width: auto;
    display: block;
}

.header-text h1 {
    font-size: 1.6rem;
    color: var(--text-primary);
}

.subtitle {
    color: var(--accent);
    font-weight: 600;
}

/* Quick Links */
.quick-links {
    display: flex;
    gap: 15px;
    margin: 30px 0;
}

.btn {
    flex: 1;
    text-align: center;
    padding: 12px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, opacity 0.2s;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-primary {
    background-color: var(--accent);
    color: #000;
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Classes Section */
.classes-section h2 {
    margin-bottom: 20px;
    font-size: 1.3rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.classes-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.class-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.class-number {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    background: rgba(16, 185, 129, 0.1);
    padding: 6px 12px;
    border-radius: 6px;
    white-space: nowrap;
}

.class-info {
    flex-grow: 1;
}

.class-info h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.class-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.class-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    white-space: nowrap;
}

.class-link:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 40px;
}

/* Responsivo para móviles */
@media (max-width: 600px) {

    .header-container,
    .class-card,
    .quick-links {
        flex-direction: column;
        align-items: flex-start;
    }

    .quick-links {
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}