/* ===============================================
   MODERN EIE - Sistema de Diseño Moderno
   Escuela de Ingeniería Eléctrica UCR
   =============================================== */

:root {
    /* Colores Institucionales UCR */
    --ucr-blue: #003d7a;
    --ucr-gold: #fdb913;
    --ucr-blue-dark: #002855;
    --ucr-blue-light: #0066cc;
    
    /* Colores Modernos */
    --primary: #003d7a;
    --secondary: #fdb913;
    --accent: #0066cc;
    --dark: #1a1a1a;
    --light: #f8f9fa;
    --success: #28a745;
    --info: #17a2b8;
    --warning: #ffc107;
    --danger: #dc3545;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #003d7a 0%, #0066cc 100%);
    --gradient-hero: linear-gradient(135deg, rgba(0, 61, 122, 0.95) 0%, rgba(0, 102, 204, 0.9) 100%);
    --gradient-overlay: linear-gradient(to bottom, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.6));
    
    /* Tipografía */
    --font-primary: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-headings: 'Open Sans', 'Helvetica Neue', sans-serif;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
}

/* ===============================================
   RESET Y BASE
   =============================================== */

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

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

/* ===============================================
   NAVEGACIÓN MODERNA
   =============================================== */

.modern-navbar {
    background: #ffffff;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
    padding: 0.5rem 0;
}

.modern-navbar.scrolled {
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.15);
}

.navbar-brand-modern {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--ucr-blue) !important;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.navbar-brand-modern:hover {
    opacity: 0.85;
}

.navbar-brand-modern span {
    color: var(--ucr-blue) !important;
}

.nav-link-modern {
    font-weight: 500;
    font-size: 0.95rem;
    color: #444 !important;
    padding: 0.5rem 1rem !important;
    border-radius: 6px;
    transition: all var(--transition-fast);
    position: relative;
    text-decoration: none;
}

.nav-link-modern:hover {
    color: var(--ucr-blue) !important;
    background: rgba(0, 61, 122, 0.08);
}

/* Mostrar dropdown al pasar el mouse (hover) */
.nav-item.dropdown:hover .dropdown-menu {
    display: block;
    animation: fadeInDown 0.3s ease-in-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-menu {
    border: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    border-radius: 8px;
    margin-top: 0;
    padding-top: 0.5rem;
    display: none;
}

/* Puente invisible sobre el gap para que el hover no se corte */
.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    left: 0;
    right: 0;
    height: 0.5rem;
}

.dropdown-item {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: rgba(0, 61, 122, 0.08);
    color: var(--ucr-blue);
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* ===============================================
   HERO SECTION - Carrusel de Imágenes Moderno
   =============================================== */

.hero-modern {
    position: relative;
    min-height: 600px;
    background: linear-gradient(135deg, #003d7a 0%, #0066cc 100%);
    overflow: hidden;
}

.hero-modern .carousel {
    height: 100%;
}

.hero-modern .carousel-inner {
    height: 600px;
}

.hero-modern .carousel-item {
    height: 600px;
    position: relative;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    z-index: 1;
}

.hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    text-align: center;
    color: white;
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: 1200px;
    width: 100%;
}

/* Controles del carrusel modernos */
.hero-modern .carousel-control-prev,
.hero-modern .carousel-control-next {
    width: 60px;
    height: 60px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.7;
    transition: all var(--transition-fast);
    z-index: 3;
}

.hero-modern .carousel-control-prev:hover,
.hero-modern .carousel-control-next:hover {
    opacity: 1;
}

.hero-modern .carousel-control-prev {
    left: 20px;
}

.hero-modern .carousel-control-next {
    right: 20px;
}

/* Indicadores del carrusel modernos */
.hero-modern .carousel-indicators {
    z-index: 3;
    margin-bottom: 2rem;
}

.hero-modern .carousel-indicators button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid white;
    opacity: 0.6;
    transition: all var(--transition-fast);
}

.hero-modern .carousel-indicators button.active {
    opacity: 1;
    background-color: var(--ucr-gold);
    border-color: var(--ucr-gold);
}

/* Transición fade para el carrusel */
.carousel-fade .carousel-item {
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

.carousel-fade .carousel-item.active {
    opacity: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-slide-info {
    border-top: 1px solid rgba(255,255,255,0.3);
    padding-top: 0.75rem;
}

.hero-slide-titulo {
    font-size: clamp(1rem, 1.8vw, 1.3rem);
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.25rem;
    letter-spacing: 0.01em;
}

.hero-cta {
    display: inline-flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn-modern {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.btn-primary-modern {
    background: var(--ucr-gold);
    color: var(--ucr-blue-dark);
    box-shadow: 0 4px 15px rgba(253, 185, 19, 0.4);
}

.btn-primary-modern:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(253, 185, 19, 0.5);
    color: var(--ucr-blue-dark);
}

.btn-secondary-modern {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary-modern:hover {
    background: white;
    color: var(--ucr-blue);
    transform: translateY(-3px);
}

/* ===============================================
   STATS SECTION - Métricas Institucionales
   =============================================== */

.stats-section {
    margin-top: -80px;
    position: relative;
    z-index: 10;
    padding: 0 var(--spacing-md);
}

.stats-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
}

.stat-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 61, 122, 0.2);
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--ucr-blue);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    color: #666;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===============================================
   SECTIONS MODERNAS
   =============================================== */

.section-modern {
    padding: var(--spacing-xl) var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--ucr-blue);
    margin-bottom: var(--spacing-md);
    position: relative;
    display: block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* ===============================================
   CARDS MODERNAS
   =============================================== */

.card-modern {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.card-modern:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.card-modern:hover .card-image {
    transform: scale(1.1);
}

.form-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.card-body-modern {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-title-modern {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ucr-blue);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.card-date {
    font-size: 0.9rem;
    color: #999;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-text-modern {
    color: #555;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    flex: 1;
}

.card-link-modern {
    color: var(--ucr-blue-light);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap var(--transition-fast);
}

.card-link-modern:hover {
    gap: 1rem;
    color: var(--ucr-blue);
}

/* ===============================================
   EVENTOS Y ANUNCIOS
   =============================================== */

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
}

.event-card, .announcement-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border-left: 4px solid var(--ucr-blue);
}

.event-card:hover, .announcement-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.event-meta, .announcement-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: #666;
}

/* ===============================================
   FOOTER MODERNO
   =============================================== */

.footer-modern {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #fff;
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--ucr-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    transition: all var(--transition-fast);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--ucr-gold);
    transform: translateX(5px);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--ucr-gold);
    color: var(--ucr-blue-dark);
    transform: translateY(-3px);
}

.footer-bottom {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: #999;
}

/* ===============================================
   ANIMACIONES
   =============================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===============================================
   UTILIDADES
   =============================================== */

.text-gradient {
    color: #f5a623;
}

.container-modern {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-sm { margin-bottom: var(--spacing-sm); }

.mt-xl { margin-top: var(--spacing-xl); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-md { margin-top: var(--spacing-md); }
.mt-sm { margin-top: var(--spacing-sm); }

/* ===============================================
   RESPONSIVE
   =============================================== */

@media (max-width: 768px) {
    .hero-modern {
        min-height: 500px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .stats-section {
        margin-top: -40px;
    }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .section-modern {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-modern {
        width: 100%;
    }
}

/* ===============================================
   ACCESIBILIDAD
   =============================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible para navegación por teclado */
*:focus-visible {
    outline: 3px solid var(--ucr-gold);
    outline-offset: 2px;
}

/* ===============================================
   COMPATIBILIDAD CON ESTILOS LEGACY
   =============================================== */

.modern-mode .encabezado {
    background: var(--ucr-blue-dark);
}

/* Quick Access Links */
.quick-access {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.quick-access a {
    font-size: 0.875rem;
    font-weight: 500;
    transition: opacity var(--transition-fast);
    white-space: nowrap;
}

.quick-access a:hover {
    opacity: 0.8;
}

.quick-access i {
    font-size: 0.875rem;
}

@media (max-width: 991px) {
    .quick-access {
        justify-content: flex-end;
        gap: 1rem;
        margin-top: 0.5rem;
    }
    
    .quick-access a {
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    .quick-access {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .quick-access a {
        font-size: 0.85rem;
    }
}

.modern-mode #k-head {
    display: none;
}

.modern-mode #k-footer,
.modern-mode #k-subfooter {
    display: none;
}