/* ============================================
   TUTORIUM - Estilos Principales
   Sistema de Audio Personalizado
   ============================================ */

:root {
    /* Colores Principales */
    --primary-color: #00d4ff;
    --secondary-color: #0099cc;
    --accent-color: #ff6b35;
    --dark-bg: #0a0e27;
    --dark-secondary: #1a1f3a;
    --text-light: #ffffff;
    --text-gray: #a0a8b8;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4444;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #00d4ff, #0099cc);
    --gradient-secondary: linear-gradient(135deg, #1a1f3a, #0a0e27);
    --gradient-accent: linear-gradient(135deg, #ff6b35, #ff8f65);
    
    /* Sombras */
    --shadow-soft: 0 4px 20px rgba(0, 212, 255, 0.15);
    --shadow-medium: 0 8px 40px rgba(0, 212, 255, 0.2);
    --shadow-strong: 0 16px 60px rgba(0, 212, 255, 0.3);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Fuentes */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-code: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
}

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

/* ============================================
   Sistema de Audio
   ============================================ */
.audio-system {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: rgba(26, 31, 58, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 15px;
    border: 1px solid rgba(0, 212, 255, 0.3);
    box-shadow: var(--shadow-soft);
}

.audio-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.audio-toggle {
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-medium);
    color: white;
    font-size: 16px;
}

.audio-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-medium);
}

.audio-toggle.muted {
    background: var(--gradient-accent);
}

.audio-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#audioStatus {
    font-size: 12px;
    color: var(--text-gray);
}

/* ============================================
   Header y Navegación
   ============================================ */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(0, 212, 255, 0.2);
    padding: 0 20px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 32px;
}

.tagline {
    font-size: 14px;
    color: var(--text-gray);
    font-style: italic;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    padding: 12px 20px;
    border-radius: 25px;
    transition: var(--transition-medium);
    position: relative;
}

.nav-link:hover {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.nav-link.login-btn {
    background: var(--gradient-primary);
    color: white;
}

.nav-link.login-btn:hover {
    background: var(--gradient-accent);
    transform: translateY(-2px) scale(1.05);
}

.nav-link.security-btn {
    background: var(--gradient-accent);
    color: white;
    animation: pulse-security 2s infinite;
}

@keyframes pulse-security {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.7); }
    50% { box-shadow: 0 0 0 10px rgba(255, 107, 53, 0); }
}

.mobile-menu-toggle {
    display: none;
    color: var(--primary-color);
    font-size: 24px;
    cursor: pointer;
}

/* ============================================
   Contenido Principal
   ============================================ */
.main-content {
    margin-top: 80px;
}

.hero-section {
    padding: 100px 20px;
    text-align: center;
    background: var(--gradient-secondary);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-medium);
    border: none;
    cursor: pointer;
    font-size: 16px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

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

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

/* ============================================
   Elementos Flotantes
   ============================================ */
.hero-visual {
    position: relative;
    height: 400px;
}

.floating-elements {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-icon {
    position: absolute;
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
    animation: float 3s ease-in-out infinite;
    animation-delay: var(--delay);
    box-shadow: var(--shadow-soft);
}

.floating-icon:nth-child(1) { top: 10%; left: 20%; }
.floating-icon:nth-child(2) { top: 30%; right: 10%; }
.floating-icon:nth-child(3) { bottom: 30%; left: 10%; }
.floating-icon:nth-child(4) { bottom: 10%; right: 20%; }

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* ============================================
   Secciones de Características
   ============================================ */
.features-section {
    padding: 100px 20px;
    background: var(--dark-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(26, 31, 58, 0.8);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: var(--transition-medium);
    border: 1px solid rgba(0, 212, 255, 0.1);
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* ============================================
   Estadísticas
   ============================================ */
.stats-section {
    padding: 80px 20px;
    background: var(--dark-bg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 40px 20px;
    background: rgba(26, 31, 58, 0.5);
    border-radius: 15px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--text-gray);
    font-weight: 500;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: 100px 20px;
    background: var(--gradient-secondary);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* ============================================
   Chat Bot FAB
   ============================================ */
.chat-bot-fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: var(--transition-medium);
    box-shadow: var(--shadow-medium);
}

.chat-bot-fab:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-strong);
}

.chat-bot-icon {
    font-size: 24px;
    color: white;
}

.chat-bot-pulse {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--primary-color);
    animation: pulse 2s infinite;
    z-index: -1;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(0, 212, 255, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(0, 212, 255, 0);
    }
}

/* ============================================
   Footer
   ============================================ */
.main-footer {
    background: var(--dark-secondary);
    padding: 60px 20px 20px;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--text-gray);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 212, 255, 0.1);
    color: var(--text-gray);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 14, 39, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition-medium);
        pointer-events: none;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .audio-system {
        top: 10px;
        right: 10px;
        padding: 10px;
    }
}

/* ============================================
   Animaciones y Efectos
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.fade-in.active {
    opacity: 1;
    transform: translateY(0);
}

.scale-in {
    transform: scale(0.8);
    opacity: 0;
    transition: var(--transition-medium);
}

.scale-in.active {
    transform: scale(1);
    opacity: 1;
}

.slide-in-left {
    transform: translateX(-50px);
    opacity: 0;
    transition: var(--transition-medium);
}

.slide-in-left.active {
    transform: translateX(0);
    opacity: 1;
}

.slide-in-right {
    transform: translateX(50px);
    opacity: 0;
    transition: var(--transition-medium);
}

.slide-in-right.active {
    transform: translateX(0);
    opacity: 1;
}

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

.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.mb-40 { margin-bottom: 40px; }

.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }

.p-20 { padding: 20px; }
.p-30 { padding: 30px; }
.p-40 { padding: 40px; }

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

/* ============================================
   Efectos de Sonido Visuales
   ============================================ */
.sound-effect {
    position: relative;
    overflow: hidden;
}

.sound-effect::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(0, 212, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: sound-ripple 0.6s ease-out;
}

@keyframes sound-ripple {
    to {
        width: 200px;
        height: 200px;
        opacity: 0;
    }
}