/* Variables CSS - Minimalista y Flow Estudiantil */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header Minimalista */
.header {
    background: var(--primary-color);
    color: white;
    padding: 1.5rem 0;
    box-shadow: var(--shadow-sm);
}

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

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.tagline {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 400;
    margin-top: 0.25rem;
}

/* Breadcrumb Minimalista */
.breadcrumb {
    background-color: var(--bg-primary);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-list {
    list-style: none;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
    font-size: 0.875rem;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
}

.breadcrumb-list li:not(:last-child)::after {
    content: '/';
    margin-left: 0.75rem;
    color: var(--text-light);
}

.breadcrumb-list a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.breadcrumb-list a:hover {
    color: var(--primary-dark);
}

.breadcrumb-list li:last-child {
    color: var(--text-secondary);
    font-weight: 500;
}

.hidden {
    display: none !important;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 1.5rem;
}

/* Sidebar Minimalista */
.sidebar {
    background-color: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    height: fit-content;
    position: sticky;
    top: 2rem;
    border: 1px solid var(--border-color);
}

.sidebar h2 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary-color);
    font-weight: 600;
}

.categories-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-item {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    font-size: 0.9375rem;
}

.category-item:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
}

.category-item.active {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.category-item.active .subcategory {
    color: rgba(255, 255, 255, 0.95);
}

.subcategory {
    display: block;
    margin-top: 0.75rem;
    padding-left: 1.25rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-left: 2px solid var(--border-color);
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    margin-left: 0.5rem;
    transition: var(--transition);
}

.category-item.active .subcategory {
    border-left-color: rgba(255, 255, 255, 0.4);
}

.subcategory:hover {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.category-item.active .subcategory:hover {
    color: white;
}

/* Resources Section */
.resources-section {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.section-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

.section-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Resources Grid */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-light);
    font-size: 1rem;
}

/* Resource Card Minimalista */
.resource-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.resource-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    font-size: 1.5rem;
    line-height: 1;
}

.resource-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.resource-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 1.25rem;
    flex: 1;
    line-height: 1.6;
}

.resource-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    margin-bottom: 1rem;
    font-size: 0.8125rem;
    color: var(--text-light);
}

.resource-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-weight: 500;
}

.download-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    box-shadow: var(--shadow-sm);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: #059669;
}

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

/* Footer Minimalista */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-section ul li:last-child {
    border-bottom: none;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8125rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 240px 1fr;
        gap: 1.25rem;
    }
}

@media (max-width: 768px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        margin-bottom: 1rem;
    }

    .resources-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.8125rem;
    }

    .resources-section {
        padding: 1.5rem;
    }

    .section-header h2 {
        font-size: 1.375rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .header {
        padding: 1.25rem 0;
    }

    .logo {
        font-size: 1.375rem;
    }

    .main-content {
        padding: 1.5rem 0;
    }

    .resources-section {
        padding: 1.25rem;
    }

    .resource-card {
        padding: 1.5rem;
    }
}

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

.resource-card {
    animation: fadeIn 0.3s ease backwards;
}

.resource-card:nth-child(1) { animation-delay: 0.05s; }
.resource-card:nth-child(2) { animation-delay: 0.1s; }
.resource-card:nth-child(3) { animation-delay: 0.15s; }
.resource-card:nth-child(4) { animation-delay: 0.2s; }
.resource-card:nth-child(5) { animation-delay: 0.25s; }

/* Accesibilidad */
.download-btn:focus,
.category-item:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .sidebar,
    .footer,
    .breadcrumb,
    .download-btn {
        display: none;
    }

    .resources-section {
        box-shadow: none;
        padding: 0;
        border: none;
    }
}