:root {
    --primary-color: #0a4d8c;
    --secondary-color: #ff6b00;
    --accent-color: #e63946;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --card-bg: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --tab-inactive: #e9ecef;
    --tab-active: #ffffff;
    --tomo-color: #2a9d8f;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f0f4f8;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0a3a6b 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.header-content {
    position: relative;
    z-index: 2;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
}

.header-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    z-index: 1;
}

/* Selector principal */
.main-selector {
    background-color: white;
    margin: 2rem auto 0;
    border-radius: 10px 10px 0 0;
    box-shadow: var(--shadow);
    max-width: 1400px;
    padding: 1.5rem;
}

.selector-title {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.selector-title i {
    color: var(--secondary-color);
}

/* Botones de Tomos */
.selector-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.selector-btn {
    padding: 0.9rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 150px;
    justify-content: center;
}

.tomo-btn {
    background-color: var(--tomo-color);
    color: white;
}

.tomo-btn:hover {
    background-color: #238276;
    transform: translateY(-3px);
}

.tomo-btn.active {
    background-color: #1d7a6f;
    box-shadow: 0 4px 8px rgba(42, 157, 143, 0.3);
}

/* Año activo indicador */
.year-indicator {
    text-align: center;
    margin: 1.5rem auto;
    background-color: white;
    padding: 0.8rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    max-width: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.year-indicator i {
    color: var(--secondary-color);
    font-size: 1.2rem;
}

.year-indicator span {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.3rem;
}

/* Tabs de años */
.tabs-container {
    background-color: white;
    margin: 0 auto;
    border-radius: 0 0 10px 10px;
    box-shadow: var(--shadow);
    max-width: 1400px;
}

.tabs {
    display: flex;
    border-bottom: 2px solid #eee;
}

.tab {
    flex: 1;
    text-align: center;
    padding: 1.2rem 1rem;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--tab-inactive);
    color: #666;
    border: none;
    outline: none;
}

.tab:first-child {
    border-radius: 0;
}

.tab:last-child {
    border-radius: 0;
}

.tab:hover {
    background-color: #e0e0e0;
}

.tab.active {
    background-color: var(--tab-active);
    color: var(--primary-color);
    border-bottom: 3px solid var(--secondary-color);
}

.tab-badge {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 20px;
    margin-left: 8px;
    vertical-align: middle;
}

/* Contador de cursos */
.courses-counter {
    text-align: center;
    margin: 0.5rem auto 1.5rem;
    color: #666;
    font-size: 1.1rem;
}

.courses-counter span {
    font-weight: 700;
    color: var(--primary-color);
}

/* Selector actual */
.current-selector {
    text-align: center;
    margin: 1rem auto;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    max-width: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-weight: 600;
}

.current-selector i {
    font-size: 1.3rem;
}

/* Main content */
.intro {
    text-align: center;
    padding: 2rem 0 1rem;
    background-color: white;
    margin: 0 auto 0;
    border-radius: 0 0 10px 10px;
    box-shadow: var(--shadow);
    max-width: 1400px;
}

.intro p {
    font-size: 1.1rem;
    color: #555;
    padding: 0 1.5rem;
}

/* Grid de cursos */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 2rem 0;
}

.course-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    border: 1px solid #eaeaea;
    position: relative;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.course-logo {
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to right, #f8f9fa, #e9ecef);
    padding: 1.5rem;
    border-bottom: 1px solid #eee;
}

.course-logo i {
    font-size: 3.5rem;
    color: var(--primary-color);
}

.course-content {
    padding: 1.5rem 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
    min-height: 3.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-content p {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
    flex-grow: 1;
}

.drive-link {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    margin-top: auto;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.drive-link:hover {
    background-color: #e55a00;
    transform: scale(1.05);
}

.drive-link i {
    margin-right: 8px;
}

.year-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 3px 8px;
    border-radius: 12px;
    font-weight: 600;
}

.selector-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: var(--tomo-color);
    color: white;
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

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

.footer-logo {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    margin: 1rem 0;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: #ddd;
    text-decoration: none;
    transition: color 0.3s;
}

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

.copyright {
    margin-top: 1.5rem;
    color: #aaa;
    font-size: 0.9rem;
}

/* Responsive adjustments */
@media (max-width: 1100px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.2rem;
    }
    
    .selector-buttons {
        gap: 0.8rem;
    }
    
    .selector-btn {
        min-width: 130px;
        padding: 0.8rem 1.2rem;
        font-size: 1rem;
    }
}

@media (max-width: 992px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 1.2rem;
    }
    
    header h1 {
        font-size: 2.2rem;
    }
    
    .tab {
        font-size: 1.1rem;
        padding: 1rem 0.8rem;
    }
    
    .selector-buttons {
        gap: 0.7rem;
    }
    
    .selector-btn {
        min-width: 120px;
        padding: 0.7rem 1rem;
        font-size: 0.95rem;
    }
}

@media (max-width: 768px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }
    
    .course-logo i {
        font-size: 3rem;
    }
    
    .course-content h3 {
        font-size: 1.2rem;
        min-height: 2.8rem;
    }
    
    header h1 {
        font-size: 1.9rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .tabs-container {
        margin: 1.5rem auto 0;
    }
    
    .tab {
        font-size: 1rem;
        padding: 0.9rem 0.5rem;
    }
    
    .selector-buttons {
        gap: 0.6rem;
    }
    
    .selector-btn {
        min-width: 110px;
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }
    
    .course-logo {
        height: 100px;
        padding: 1rem;
    }
    
    .course-logo i {
        font-size: 2.5rem;
    }
    
    .course-content {
        padding: 1rem 0.8rem;
    }
    
    .course-content h3 {
        font-size: 1.1rem;
        min-height: 2.6rem;
    }
    
    .intro {
        padding: 1.5rem 0;
        margin: 0 auto 1rem;
    }
    
    .intro p {
        padding: 0 1rem;
        font-size: 1rem;
    }
    
    header {
        padding: 1.5rem 0;
    }
    
    header h1 {
        font-size: 1.7rem;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab {
        border-radius: 0 !important;
        text-align: left;
        padding-left: 1.5rem;
    }
    
    .tab:first-child {
        border-radius: 10px 10px 0 0 !important;
    }
    
    .year-indicator {
        max-width: 250px;
        padding: 0.6rem;
    }
    
    .selector-buttons {
        gap: 0.5rem;
    }
    
    .selector-btn {
        min-width: 100px;
        padding: 0.5rem 0.7rem;
        font-size: 0.85rem;
        flex-direction: column;
        gap: 4px;
    }
    
    .selector-btn i {
        font-size: 1.2rem;
    }
    
    .current-selector {
        padding: 0.8rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 400px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .selector-buttons {
        gap: 0.4rem;
    }
    
    .selector-btn {
        min-width: 90px;
        padding: 0.5rem;
        font-size: 0.8rem;
    }
}