/* ============================================
   PORTAL POSTGRADO UFRO - Estilos Principales
   Universidad de La Frontera
   Paleta Institucional
   ============================================ */

/* Variables CSS */
:root {
    --azul-ufro: #00396C;
    --azul-ufro-dark: #002850;
    --azul-ufro-light: #00529B;
    --verde-ufro: #00843D;
    --verde-ufro-light: #00A64D;
    --blanco: #FFFFFF;
    --gris-claro: #F5F7FA;
    --gris-medio: #E8ECF1;
    --gris-oscuro: #6B7280;
    --texto-oscuro: #1F2937;
    --texto-medio: #4B5563;
    --sombra: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --sombra-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transicion: all 0.3s ease;
    --radio: 8px;
    --radio-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--texto-oscuro);
    background-color: var(--gris-claro);
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--azul-ufro);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    color: var(--texto-medio);
}

a {
    color: var(--azul-ufro);
    text-decoration: none;
    transition: var(--transicion);
}

a:hover {
    color: var(--azul-ufro-light);
}

/* Contenedor */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   HEADER Y NAVEGACIÓN
   ============================================ */
.header {
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-dark) 100%);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--sombra-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-img {
    height: 50px;
    width: auto;
}

.logo-text {
    color: var(--blanco);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.logo-text span {
    display: block;
    font-size: 0.75rem;
    font-weight: 400;
    opacity: 0.9;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-menu a {
    color: var(--blanco);
    padding: 0.75rem 1rem;
    border-radius: var(--radio);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transicion);
}

.nav-menu a:hover,
.nav-menu a.active {
    background: rgba(255, 255, 255, 0.15);
    color: var(--blanco);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--blanco);
    border-radius: 2px;
    transition: var(--transicion);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-light) 50%, var(--verde-ufro) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="rgba(255,255,255,0.03)"/></svg>');
    background-size: 50px 50px;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-50px) rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--blanco);
    padding: 2rem;
}

.hero-title {
    font-size: 3rem;
    color: var(--blanco);
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radio);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transicion);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--blanco);
    color: var(--azul-ufro);
}

.btn-primary:hover {
    background: var(--gris-claro);
    transform: translateY(-2px);
    box-shadow: var(--sombra-lg);
    color: var(--azul-ufro);
}

.btn-secondary {
    background: transparent;
    color: var(--blanco);
    border: 2px solid var(--blanco);
}

.btn-secondary:hover {
    background: var(--blanco);
    color: var(--azul-ufro);
}

.btn-green {
    background: var(--verde-ufro);
    color: var(--blanco);
}

.btn-green:hover {
    background: var(--verde-ufro-light);
    transform: translateY(-2px);
}

/* ============================================
   SECCIONES GENERALES
   ============================================ */
.section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    position: relative;
    display: inline-block;
    padding-bottom: 1rem;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--azul-ufro), var(--verde-ufro));
    border-radius: 2px;
}

.section-title p {
    max-width: 600px;
    margin: 1rem auto 0;
    color: var(--texto-medio);
}

/* Cards */
.card {
    background: var(--blanco);
    border-radius: var(--radio-lg);
    box-shadow: var(--sombra);
    overflow: hidden;
    transition: var(--transicion);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-lg);
}

.card-header {
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-light) 100%);
    color: var(--blanco);
    padding: 1.5rem;
}

.card-header h3 {
    color: var(--blanco);
    margin: 0;
}

.card-body {
    padding: 1.5rem;
}

/* Grid de Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

/* ============================================
   PROCESOS ACADÉMICOS
   ============================================ */
.procesos-section {
    background: var(--blanco);
}

.proceso-card {
    background: var(--blanco);
    border-radius: var(--radio-lg);
    box-shadow: var(--sombra);
    overflow: hidden;
    transition: var(--transicion);
    border-left: 4px solid var(--azul-ufro);
}

.proceso-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--sombra-lg);
}

.proceso-card.verde {
    border-left-color: var(--verde-ufro);
}

.proceso-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blanco);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.proceso-card.verde .proceso-icon {
    background: linear-gradient(135deg, var(--verde-ufro) 0%, var(--verde-ufro-light) 100%);
}

/* Pasos numerados */
.pasos-lista {
    counter-reset: paso;
    list-style: none;
    padding: 0;
}

.paso-item {
    position: relative;
    padding-left: 3.5rem;
    padding-bottom: 1.5rem;
    border-left: 2px solid var(--gris-medio);
    margin-left: 1rem;
}

.paso-item:last-child {
    border-left: none;
    padding-bottom: 0;
}

.paso-item::before {
    counter-increment: paso;
    content: counter(paso);
    position: absolute;
    left: -1.25rem;
    top: 0;
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blanco);
    font-weight: 700;
    font-size: 1rem;
}

.paso-item h4 {
    margin-bottom: 0.5rem;
    color: var(--azul-ufro);
}

.paso-item p {
    margin: 0;
    font-size: 0.95rem;
}

/* ============================================
   MATRIZ DE DECISIÓN
   ============================================ */
.matriz-section {
    background: var(--gris-claro);
}

.matriz-container {
    background: var(--blanco);
    border-radius: var(--radio-lg);
    padding: 2rem;
    box-shadow: var(--sombra);
}

.matriz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.matriz-opcion {
    background: var(--gris-claro);
    border-radius: var(--radio);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transicion);
    cursor: pointer;
    border: 2px solid transparent;
}

.matriz-opcion:hover {
    border-color: var(--azul-ufro);
    transform: scale(1.02);
}

.matriz-opcion.selected {
    border-color: var(--verde-ufro);
    background: rgba(0, 132, 61, 0.1);
}

.matriz-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.matriz-opcion h4 {
    margin-bottom: 0.5rem;
}

.matriz-opcion p {
    font-size: 0.9rem;
    margin: 0;
}

/* ============================================
   CALENDARIO ACADÉMICO
   ============================================ */
.calendario-section {
    background: var(--blanco);
}

.calendario-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.calendario-mes {
    background: var(--gris-claro);
    border-radius: var(--radio-lg);
    overflow: hidden;
}

.calendario-header {
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-light) 100%);
    color: var(--blanco);
    padding: 1rem 1.5rem;
    font-weight: 600;
}

.calendario-body {
    padding: 1rem;
}

.calendario-evento {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--blanco);
    border-radius: var(--radio);
    margin-bottom: 0.75rem;
    transition: var(--transicion);
}

.calendario-evento:hover {
    transform: translateX(5px);
    box-shadow: var(--sombra);
}

.calendario-evento:last-child {
    margin-bottom: 0;
}

.evento-fecha {
    background: var(--verde-ufro);
    color: var(--blanco);
    padding: 0.5rem;
    border-radius: var(--radio);
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 60px;
    text-align: center;
}

.evento-info h5 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--texto-oscuro);
}

.evento-info p {
    font-size: 0.85rem;
    margin: 0;
    color: var(--texto-medio);
}

/* ============================================
   FORMULARIOS Y DOCUMENTOS
   ============================================ */
.documentos-section {
    background: var(--gris-claro);
}

.documento-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: var(--blanco);
    border-radius: var(--radio);
    margin-bottom: 1rem;
    box-shadow: var(--sombra);
    transition: var(--transicion);
}

.documento-item:hover {
    transform: translateX(5px);
    box-shadow: var(--sombra-lg);
}

.documento-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.documento-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--azul-ufro) 0%, var(--azul-ufro-light) 100%);
    border-radius: var(--radio);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blanco);
    font-size: 1.25rem;
}

.documento-info h4 {
    margin: 0;
    font-size: 1rem;
}

.documento-info p {
    margin: 0;
    font-size: 0.85rem;
}

.btn-download {
    background: var(--verde-ufro);
    color: var(--blanco);
    padding: 0.5rem 1rem;
    border-radius: var(--radio);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transicion);
}

.btn-download:hover {
    background: var(--verde-ufro-light);
    color: var(--blanco);
}

/* ============================================
   INFOGRAFÍAS
   ============================================ */
.infografia-container {
    background: var(--blanco);
    border-radius: var(--radio-lg);
    padding: 2rem;
    box-shadow: var(--sombra);
}

.infografia-paso {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--gris-medio);
}

.infografia-paso:last-child {
    border-bottom: none;
}

.infografia-numero {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--verde-ufro) 0%, var(--verde-ufro-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blanco);
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.infografia-contenido h4 {
    margin-bottom: 0.5rem;
}

.infografia-contenido p {
    margin: 0;
}

/* ============================================
   ACCORDION
   ============================================ */
.accordion {
    background: var(--blanco);
    border-radius: var(--radio-lg);
    overflow: hidden;
    box-shadow: var(--sombra);
}

.accordion-item {
    border-bottom: 1px solid var(--gris-medio);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transicion);
    text-align: left;
}

.accordion-header:hover {
    background: var(--gris-claro);
}

.accordion-header h4 {
    margin: 0;
    font-size: 1rem;
}

.accordion-icon {
    font-size: 1.25rem;
    color: var(--azul-ufro);
    transition: var(--transicion);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-item.active .accordion-body {
    max-height: 1000px;
}

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

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: linear-gradient(135deg, var(--azul-ufro-dark) 0%, var(--azul-ufro) 100%);
    color: var(--blanco);
    padding: 3rem 0 1.5rem;
}

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

.footer-section h4 {
    color: var(--blanco);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
}

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

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
}

/* ============================================
   ALERTAS Y BADGES
   ============================================ */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radio);
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-info {
    background: rgba(0, 57, 108, 0.1);
    border-left: 4px solid var(--azul-ufro);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.15);
    border-left: 4px solid #FFC107;
}

.alert-success {
    background: rgba(0, 132, 61, 0.1);
    border-left: 4px solid var(--verde-ufro);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    border-left: 4px solid #DC3545;
}

.badge {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-primary {
    background: var(--azul-ufro);
    color: var(--blanco);
}

.badge-success {
    background: var(--verde-ufro);
    color: var(--blanco);
}

/* ============================================
   TABS
   ============================================ */
.tabs-container {
    margin-bottom: 2rem;
}

.tabs-nav {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--gris-medio);
    overflow-x: auto;
    padding-bottom: 0;
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--texto-medio);
    position: relative;
    transition: var(--transicion);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--azul-ufro);
}

.tab-btn.active {
    color: var(--azul-ufro);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--azul-ufro);
    border-radius: 2px 2px 0 0;
}

.tab-content {
    display: none;
    padding: 2rem 0;
}

.tab-content.active {
    display: block;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--azul-ufro);
        flex-direction: column;
        padding: 2rem;
        gap: 0;
        transition: var(--transicion);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu a {
        padding: 1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-toggle {
        display: flex;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 3rem 0;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .calendario-grid {
        grid-template-columns: 1fr;
    }

    .documento-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .btn-download {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .tabs-nav {
        flex-wrap: nowrap;
        overflow-x: auto;
    }

    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
}

/* ============================================
   UTILIDADES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.py-2 { padding-top: 1rem; padding-bottom: 1rem; }
.py-3 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-4 { padding-top: 2rem; padding-bottom: 2rem; }

.hidden { display: none; }
.visible { display: block; }

/* Animaciones */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}