/* ========================================
   GESSOF Academy - Portal de Aprendizaje
   Estilos Principales y Variables CSS
   ======================================== */

:root {
    /* Colores Primarios */
    --primary: #0099d8;
    --primary-dark: #0077a8;
    --primary-light: #00b4ff;
    --primary-glow: rgba(0, 153, 216, 0.4);

    /* Colores de Acento */
    --accent-cyan: #00d4ff;
    --accent-purple: #7c3aed;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;

    /* Fondos */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-elevated: #ffffff;

    /* Textos */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    /* Bordes */
    --border: #e2e8f0;
    --border-hover: #cbd5e1;

    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 60px var(--primary-glow);

    /* Dimensiones */
    --sidebar-width: 0px;

    /* Radios de Borde */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Animaciones */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ========================================
   Reset y Configuración Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   Fondo con Patrón
   ======================================== */

.bg-pattern {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-color: var(--bg-main);
}

body.dark .bg-pattern {
    opacity: 1;
}

/* ========================================
   Navegación Principal (Sticky Header)
   ======================================== */

.main-nav-tabs {
    position: sticky;
    top: 20px;
    z-index: 1000;
    margin: 0 auto 2rem;
    max-width: 1400px;
    padding: 0 2rem;
}

.nav-container {
    background: var(--bg-card);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

body.dark .nav-container {
    background: rgba(17, 24, 39, 0.8);
}

.main-nav-tab {
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s var(--ease-out);
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.main-nav-tab:hover {
    color: var(--primary);
    background: var(--bg-main);
}

.main-nav-tab.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 3rem;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ========================================
   Contenido Principal
   ======================================== */

.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.main-content-section {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.main-content-section.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    margin-top: 4rem;
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========================================
   Utilidades
   ======================================== */

.hidden {
    display: none !important;
}