/* ============================================
   STYLE.CSS MEJORADO - ING. EN COMPUTACIÓN UAM
   Diseño moderno, académico y tecnológico
   ============================================ */

/* Variables CSS - Paleta expandida */
:root {
    /* Colores institucionales UAM */
    --uam-red: #8B0000;
    --uam-red-dark: #660000;
    --uam-red-light: #A52A2A;
    
    /* Colores tecnológicos */
    --tech-blue: #2196F3;
    --tech-blue-dark: #1976D2;
    --tech-cyan: #00BCD4;
    --tech-purple: #673AB7;
    --tech-green: #4CAF50;
    
    /* Escala de grises moderna */
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #EEEEEE;
    --gray-300: #E0E0E0;
    --gray-400: #BDBDBD;
    --gray-500: #9E9E9E;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    
    /* Aplicación de colores */
    --primary-color: var(--uam-red);
    --secondary-color: var(--tech-blue);
    --accent-color: var(--tech-cyan);
    --success-color: var(--tech-green);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --background-primary: #FFFFFF;
    --background-secondary: var(--gray-50);
    --background-dark: var(--gray-900);
    
    /* Tipografía */
    --font-heading: 'Montserrat', 'Segoe UI', sans-serif;
    --font-body: 'Open Sans', 'Roboto', sans-serif;
    --font-mono: 'Courier New', monospace;
    
    /* Sombras modernas */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transiciones */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    overflow-x: hidden;
}

/* Tipografía mejorada */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

/* Container mejorado */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   NAVEGACIÓN MODERNA
   ============================================ */
nav {
    background-color: var(--background-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-logo img {
    height: 60px;
    transition: transform var(--transition-base);
}

.nav-logo img:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xs);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

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

.btn:hover::before {
    width: 80%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--uam-red-light));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-primary::before {
    display: none;
}

/* ============================================
   HERO SECTION MEJORADA
   ============================================ */
.hero-section {
    position: relative;
    background: linear-gradient(135deg, var(--uam-red) 0%, var(--uam-red-dark) 50%, var(--tech-purple) 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    overflow: hidden;
}

/* Patrón de fondo tecnológico */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(30deg, rgba(255,255,255,0.05) 12%, transparent 12.5%, transparent 87%, rgba(255,255,255,0.05) 87.5%, rgba(255,255,255,0.05)),
        linear-gradient(150deg, rgba(255,255,255,0.05) 12%, transparent 12.5%, transparent 87%, rgba(255,255,255,0.05) 87.5%, rgba(255,255,255,0.05)),
        linear-gradient(30deg, rgba(255,255,255,0.05) 12%, transparent 12.5%, transparent 87%, rgba(255,255,255,0.05) 87.5%, rgba(255,255,255,0.05)),
        linear-gradient(150deg, rgba(255,255,255,0.05) 12%, transparent 12.5%, transparent 87%, rgba(255,255,255,0.05) 87.5%, rgba(255,255,255,0.05));
    background-size: 80px 140px;
    background-position: 0 0, 0 0, 40px 70px, 40px 70px;
    opacity: 0.3;
}

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

.hero-section h1,
.hero-section h2 {
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    margin-bottom: var(--spacing-md);
}

.hero-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.15rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.7;
}

/* Breadcrumb académico */
.breadcrumb {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: white;
}

.breadcrumb-separator {
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   SECCIÓN DE INFORMACIÓN MEJORADA
   ============================================ */
.info-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--background-secondary);
}

.info-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--primary-color);
}

/* Grid de características moderno */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-item {
    background-color: var(--background-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: block;
}

/* Efecto de borde animado */
.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--tech-blue);
}

.feature-item:hover::before {
    transform: scaleX(1);
}

.feature-item h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

.feature-item h3 i,
.feature-item h3 svg {
    color: var(--secondary-color);
    flex-shrink: 0;
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   ESTADÍSTICAS / NÚMEROS CLAVE
   ============================================ */
.stats-section {
    background: linear-gradient(135deg, var(--gray-900), var(--gray-800));
    color: white;
    padding: var(--spacing-xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-item {
    padding: var(--spacing-md);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--tech-cyan);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   CARDS ACADÉMICAS ESPECIALIZADAS
   ============================================ */
.academic-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.academic-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.academic-card-title {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin: 0;
}

.academic-card-badge {
    background: linear-gradient(135deg, var(--tech-blue), var(--tech-cyan));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
}

/* ============================================
   AVISOS IMPORTANTES
   ============================================ */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.alert-info {
    background-color: #E3F2FD;
    border-color: var(--tech-blue);
    color: #1565C0;
}

.alert-warning {
    background-color: #FFF3E0;
    border-color: #FF9800;
    color: #E65100;
}

.alert-success {
    background-color: #E8F5E9;
    border-color: var(--tech-green);
    color: #2E7D32;
}

/* ============================================
   FOOTER MEJORADO
   ============================================ */
footer {
    background: linear-gradient(135deg, var(--gray-900), var(--gray-800));
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--tech-cyan);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ============================================
   COLORES PARA CATEGORÍAS DE MATERIAS
   ============================================ */
.cat-tg { 
    background: linear-gradient(135deg, #B3E5FC, #81D4FA);
    border-left-color: #0277BD;
}
.cat-tbp { 
    background: linear-gradient(135deg, #FFF9C4, #FFF59D);
    border-left-color: #F57F17;
}
.cat-tim { 
    background: linear-gradient(135deg, #C8E6C9, #A5D6A7);
    border-left-color: #2E7D32;
}
.cat-cc { 
    background: linear-gradient(135deg, #E1BEE7, #CE93D8);
    border-left-color: #6A1B9A;
}
.cat-cd { 
    background: linear-gradient(135deg, #D2B8E1, #BA68C8);
    border-left-color: #7B1FA2;
}
.cat-ia { 
    background: linear-gradient(135deg, #97A5F1, #7986CB);
    border-left-color: #283593;
}
.cat-rd { 
    background: linear-gradient(135deg, #7FD9E3, #4DD0E1);
    border-left-color: #00838F;
}
.cat-si { 
    background: linear-gradient(135deg, #F19E84, #FF8A65);
    border-left-color: #D84315;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }
    
    nav .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-section {
        padding: var(--spacing-xl) 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ANIMACIONES Y EFECTOS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Efecto de pulsación para elementos importantes */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

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

/* Utilidades adicionales */
.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }