/* Variables y configuración global */
:root {
    --primary-color: #1e3a8a;
    --secondary-color: #3b82f6;
    --accent-color: #fbbf24;
    --text-primary: #ffffff;
    --text-secondary: #cbd5e1;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-glass: rgba(30, 41, 59, 0.8);
    --border-color: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --font-primary: 'Exo 2', sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

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

/* Contenedor de estrellas animadas */
#stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.star {
    position: absolute;
    background: white;
    border-radius: 50%;
    animation: twinkle 3s infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* Contenedor principal */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 2rem;
    color: var(--accent-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-primary);
    font-weight: 500;
}

.nav-btn:hover {
    border-color: var(--secondary-color);
    color: var(--text-primary);
    transform: translateY(-2px);
}

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

/* Main content */
.main {
    min-height: calc(100vh - 140px);
    padding: 2rem 0;
}

/* Secciones */
.section {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

.section.active {
    display: block;
}

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

/* Hero section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem 0;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    font-family: var(--font-primary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* Sistema solar preview */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.solar-system-preview {
    position: relative;
    width: 300px;
    height: 300px;
}

.sun {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    background: var(--accent-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 20px var(--accent-color);
    animation: glow 2s infinite alternate;
}

@keyframes glow {
    from { box-shadow: 0 0 20px var(--accent-color); }
    to { box-shadow: 0 0 40px var(--accent-color), 0 0 60px var(--accent-color); }
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.mercury-orbit {
    width: 80px;
    height: 80px;
    animation: rotate 10s linear infinite;
}

.venus-orbit {
    width: 110px;
    height: 110px;
    animation: rotate 15s linear infinite;
}

.earth-orbit {
    width: 140px;
    height: 140px;
    animation: rotate 20s linear infinite;
}

.planet {
    position: absolute;
    top: -5px;
    left: 50%;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transform: translateX(-50%);
}

.mercury { background: #8c7853; }
.venus { background: #ffc649; }
.earth { background: #6b93d6; }

.moon-orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    animation: rotate 3s linear infinite;
}

.moon {
    position: absolute;
    top: -2px;
    left: 50%;
    width: 4px;
    height: 4px;
    background: #c0c0c0;
    border-radius: 50%;
    transform: translateX(-50%);
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Features grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.feature-card {
    background: var(--bg-glass);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-color);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Section headers */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Simulation container */
.simulation-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.simulation-canvas {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

#solarSystemCanvas {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: radial-gradient(circle at center, #1a1a2e 0%, #0f0f23 100%);
    margin-bottom: 1rem;
}

.simulation-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.control-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--secondary-color);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

.planet-info {
    background: var(--bg-glass);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

#selectedPlanetName {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.planet-details {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Learn section */
.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.learn-card {
    background: var(--bg-glass);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.learn-card:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-color);
    box-shadow: var(--shadow-lg);
}

.learn-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.learn-icon i {
    font-size: 2rem;
    color: white;
}

.learn-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.learning-content {
    background: var(--bg-glass);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    min-height: 300px;
}

.content-placeholder {
    text-align: center;
    color: var(--text-secondary);
    padding: 4rem 2rem;
}

.content-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* AI Chat */
.ai-chat-container {
    background: var(--bg-glass);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--bg-secondary);
}

.ai-message, .user-message {
    display: flex;
    gap: 12px;
    margin-bottom: 1rem;
}

.user-message {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ai-message .message-avatar {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.user-message .message-avatar {
    background: linear-gradient(135deg, var(--accent-color), var(--warning-color));
}

.message-avatar i {
    color: white;
    font-size: 1.2rem;
}

.message-content {
    max-width: 70%;
    padding: 1rem;
    border-radius: 12px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
}

.user-message .message-content {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
}

.chat-input-container {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.chat-input-wrapper {
    display: flex;
    gap: 12px;
    margin-bottom: 1rem;
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
}

.chat-input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.send-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.quick-questions {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.quick-questions h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 0.95rem;
    font-weight: 600;
}

.quick-questions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 8px;
    margin-top: 10px;
}

.quick-question {
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    line-height: 1.3;
}

.quick-question:hover {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(78, 205, 196, 0.3);
}

.quick-question:hover {
    border-color: var(--secondary-color);
    color: var(--text-primary);
}

/* Nuevos estilos para el sistema de categorías mejorado */
.categories-container {
    padding: 1.5rem;
    text-align: center;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.category-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    min-height: 100px;
    justify-content: center;
}

.category-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--secondary-color);
    background: var(--bg-glass);
}

.category-header {
    background: var(--bg-glass);
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.back-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

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

.question-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 15px;
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.question-number {
    background: var(--secondary-color);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
}

.question-text {
    flex: 1;
    color: var(--text-primary);
    font-size: 1rem;
}

.ask-question-btn {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.ask-question-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.chat-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-glass);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.btn {
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.system-message {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(251, 191, 36, 0.2));
    border: 1px solid rgba(251, 191, 36, 0.3);
    color: var(--accent-color);
}

/* Responsive para el nuevo sistema */
@media (max-width: 768px) {
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 10px;
    }
    
    .category-btn {
        padding: 15px 10px;
        min-height: 80px;
    }
    
    .question-item {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .question-number {
        margin: 0 auto;
    }
    
    .chat-actions {
        flex-direction: column;
        gap: 10px;
    }
}

/* Footer */
.footer {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Music Control */
.music-control {
    display: flex;
    align-items: center;
}

.music-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-primary);
    font-size: 0.9rem;
}

.music-btn:hover {
    border-color: var(--secondary-color);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.music-btn.active {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    border-color: var(--secondary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-glass);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    border: 1px solid var(--border-color);
    position: relative;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

/* Responsive design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .simulation-container {
        grid-template-columns: 1fr;
    }
    
    .footer .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .music-control {
        margin-top: 1rem;
    }
    
    .quick-questions {
        justify-content: center;
    }
}
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .learn-grid {
        grid-template-columns: 1fr;
    }
}