/**
 * ========================================
 * CRES - Comunidad Reformada de Estudios Superiores
 * Sistema de Diseño - Variables CSS
 * ======================================== 
 */

:root {
    /* Colores Institucionales CRES - Del Logo */
    --cres-burgundy: #8B1A1A;
    /* Rojo vino - Color principal */
    --cres-burgundy-dark: #6B1414;
    /* Variante oscura */
    --cres-burgundy-light: #A52A2A;
    /* Variante clara */

    --cres-gold: #FFA500;
    /* Dorado - Color secundario */
    --cres-gold-dark: #CC8400;
    /* Variante oscura */
    --cres-gold-light: #FFB733;
    /* Variante clara */

    --cres-navy: #001F3F;
    /* Azul marino - Color de acento */
    --cres-navy-dark: #001529;
    /* Variante oscura */
    --cres-navy-light: #003366;
    /* Variante clara */

    --cres-cream: #F5F5DC;
    /* Crema - Fondos suaves */
    --cres-white: #FFFFFF;
    /* Blanco */
    --cres-black: #000000;
    /* Negro */
    --cres-gray: #4A4A4A;
    /* Gris para texto secundario */
    --cres-gray-light: #E5E5E5;
    /* Gris claro para bordes */

    /* Aplicación de colores */
    --primary-color: var(--cres-burgundy);
    --secondary-color: var(--cres-gold);
    --accent-color: var(--cres-navy);
    --text-primary: var(--cres-black);
    --text-secondary: var(--cres-gray);
    --background-color: var(--cres-white);
    --background-soft: var(--cres-cream);
    --border-color: var(--cres-gray-light);

    /* Transiciones */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;

    /* Sombras */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px -5px rgba(0, 0, 0, 0.2);

    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Bordes */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Tipografía Elegante */
    --font-serif: 'Crimson Text', 'Georgia', 'Times New Roman', serif;
    --font-sans: 'Crimson Text', 'Georgia', serif;
    --font-heading: 'Playfair Display', 'Georgia', serif;
    --font-elegant: 'Cormorant Garamond', 'Georgia', serif;
}

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

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-serif);
    color: var(--text-primary);
    background-color: var(--background-color);
    line-height: 1.75;
    font-size: 18px;
    overflow-x: hidden;
}

/* Tipografía Elegante */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.elegant-italic {
    font-family: var(--font-elegant);
    font-style: italic;
    font-weight: 400;
}

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

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

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h5 {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
}

h6 {
    font-size: clamp(1rem, 1.5vw, 1.1rem);
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
}

.container-narrow {
    max-width: 900px;
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-alt {
    background-color: var(--background-soft);
}

.text-center {
    text-align: center;
}

.text-primary {
    color: var(--primary-color);
}

.text-secondary {
    color: var(--secondary-color);
}

.text-accent {
    color: var(--accent-color);
}

/* ========================================
   BOTONES
   ======================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--cres-white);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--cres-burgundy-dark);
    border-color: var(--cres-burgundy-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--cres-white);
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: var(--cres-gold-dark);
    border-color: var(--cres-gold-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--cres-white);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

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

.card {
    background-color: var(--cres-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.card-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--cres-burgundy-dark));
    color: var(--cres-white);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--background-soft);
    border-top: 1px solid var(--border-color);
}

/* ========================================
   GRID SYSTEM
   ======================================== */

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    position: relative;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: var(--cres-white);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(139, 26, 26, 0.85), rgba(0, 31, 63, 0.85));
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: var(--spacing-xl);
}

.hero h1 {
    color: var(--cres-white);
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
    color: var(--cres-white);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* ========================================
   HEADER/NAVIGATION
   ======================================== */

header {
    background-color: var(--cres-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

header.sticky {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    height: 60px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    color: var(--primary-color);
    background-color: var(--background-soft);
}

.nav-links a.active {
    color: var(--primary-color);
    font-weight: 700;
}

/* Menú móvil */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

#mobile-menu {
    display: none;
}

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

footer {
    background: linear-gradient(135deg, var(--accent-color), var(--cres-navy-dark));
    color: var(--cres-white);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

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

.footer-section h3 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

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

/* Tablet */
@media (max-width: 1024px) {
    :root {
        font-size: 15px;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .section {
        padding: var(--spacing-xl) 0;
    }

    .grid-3 {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }

    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    #mobile-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--cres-white);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-normal);
        z-index: 999;
    }

    #mobile-menu.active {
        display: block;
        transform: translateY(0);
        opacity: 1;
    }

    #mobile-menu ul {
        list-style: none;
    }

    #mobile-menu li {
        margin-bottom: var(--spacing-sm);
    }

    #mobile-menu a {
        display: block;
        padding: var(--spacing-sm);
        color: var(--text-primary);
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
    }

    #mobile-menu a:hover {
        background-color: var(--background-soft);
        color: var(--primary-color);
    }

    .hero {
        min-height: 400px;
    }

    .hero-content {
        padding: var(--spacing-lg);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        font-size: 13px;
    }

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

    .hero {
        min-height: 350px;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }
}

/* ========================================
   PLACEHOLDERS
   ======================================== */

#header-placeholder {
    min-height: 80px;
}

#footer-placeholder {
    min-height: 200px;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* Animation Utilities */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 40px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.animate-fade-in-up {
    animation-name: fadeInUp;
    animation-duration: 0.8s;
    animation-fill-mode: both;
}