:root {
    --bg-light: #f0f4f8;
    --bg-dark: #0d1117;
    --text-light: #1a1a2e;
    --text-dark: #e6edf3;
    --glass-light: rgba(255,255,255,0.7);
    --glass-dark: rgba(13,17,23,0.7);
    --border-light: rgba(255,255,255,0.5);
    --border-dark: rgba(255,255,255,0.08);
    --neon-blue: #00d4ff;
    --neon-pink: #ff00ff;
    --neon-purple: #b829dd;
    --neon-green: #00ff88;
    --shadow-light: rgba(0,0,0,0.1);
    --shadow-dark: rgba(0,0,0,0.5);
}

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

body {
    font-family: 'Rajdhani', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: background 0.6s ease, color 0.6s ease;
    overflow: hidden;
    position: relative;
}

body.light-mode {
    background: var(--bg-light);
    color: var(--text-light);
}

body.dark-mode {
    background: var(--bg-dark);
    color: var(--text-dark);
}

/* Partículas de fondo */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    animation: float 8s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.3; }
    25% { transform: translateY(-30px) translateX(10px); opacity: 1; }
    50% { transform: translateY(-15px) translateX(-10px); opacity: 0.6; }
    75% { transform: translateY(-40px) translateX(5px); opacity: 0.8; }
}

/* Panel de vidrio */
.glass-panel {
    position: relative;
    z-index: 10;
    padding: 60px 80px;
    border-radius: 24px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    text-align: center;
    transition: all 0.6s ease;
}

body.light-mode .glass-panel {
    background: var(--glass-light);
    border: 1px solid var(--border-light);
    box-shadow: 0 8px 32px var(--shadow-light), inset 0 1px 0 rgba(255,255,255,0.6);
}

body.dark-mode .glass-panel {
    background: var(--glass-dark);
    border: 1px solid var(--border-dark);
    box-shadow: 0 8px 32px var(--shadow-dark), inset 0 1px 0 rgba(255,255,255,0.05);
}

/* Título Neon GlassCodes */
.neon-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 4.5rem;
    font-weight: 900;
    letter-spacing: 8px;
    position: relative;
    margin-bottom: 20px;
    animation: neonPulse 2s ease-in-out infinite alternate;
}

body.light-mode .neon-title {
    color: #1a1a2e;
    text-shadow: 
        0 0 5px rgba(0,212,255,0.3),
        0 0 10px rgba(0,212,255,0.2),
        0 0 20px rgba(0,212,255,0.1),
        0 0 40px rgba(0,212,255,0.05);
}

body.dark-mode .neon-title {
    color: #fff;
    text-shadow: 
        0 0 5px var(--neon-blue),
        0 0 10px var(--neon-blue),
        0 0 20px var(--neon-blue),
        0 0 40px var(--neon-blue),
        0 0 80px rgba(0,212,255,0.5),
        0 0 120px rgba(0,212,255,0.3);
}

@keyframes neonPulse {
    0% { 
        text-shadow: 
            0 0 5px var(--neon-blue),
            0 0 10px var(--neon-blue),
            0 0 20px var(--neon-blue),
            0 0 40px var(--neon-blue); 
    }
    100% { 
        text-shadow: 
            0 0 10px var(--neon-blue),
            0 0 20px var(--neon-blue),
            0 0 40px var(--neon-blue),
            0 0 80px var(--neon-blue),
            0 0 120px rgba(0,212,255,0.5); 
    }
}

/* Subtítulo */
.subtitle {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 6px;
    margin-bottom: 40px;
    position: relative;
}

body.light-mode .subtitle {
    color: #2d3436;
    text-shadow: 0 0 10px rgba(255,0,255,0.2), 0 0 20px rgba(255,0,255,0.1);
}

body.dark-mode .subtitle {
    color: #fff;
    text-shadow: 
        0 0 5px var(--neon-pink),
        0 0 10px var(--neon-pink),
        0 0 20px var(--neon-pink);
}

/* Animación de construcción */
.construction-anim {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin: 30px 0;
}

.gear {
    font-size: 2.5rem;
    animation: spin 3s linear infinite;
}

.gear:nth-child(2) {
    animation-direction: reverse;
    animation-duration: 2.5s;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Barra de progreso */
.progress-container {
    width: 100%;
    max-width: 400px;
    margin: 30px auto;
    position: relative;
}

.progress-bar {
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

body.light-mode .progress-bar {
    background: rgba(0,0,0,0.1);
}

body.dark-mode .progress-bar {
    background: rgba(255,255,255,0.1);
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-pink));
    box-shadow: 0 0 10px var(--neon-blue), 0 0 20px var(--neon-purple);
    animation: progressAnim 3s ease-in-out infinite alternate;
}

@keyframes progressAnim {
    0% { width: 30%; }
    100% { width: 70%; }
}

.progress-text {
    margin-top: 10px;
    font-size: 1.1rem;
    letter-spacing: 3px;
    font-weight: 500;
}

body.light-mode .progress-text {
    color: #636e72;
}

body.dark-mode .progress-text {
    color: #a0a0a0;
    text-shadow: 0 0 5px rgba(0,212,255,0.3);
}

/* Switch modo oscuro/claro */
.theme-switch {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.4s ease;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 2px;
    border: 1px solid transparent;
}

body.light-mode .theme-switch {
    background: var(--glass-light);
    border-color: var(--border-light);
    color: var(--text-light);
    box-shadow: 0 4px 16px var(--shadow-light);
}

body.dark-mode .theme-switch {
    background: var(--glass-dark);
    border-color: var(--border-dark);
    color: var(--text-dark);
    box-shadow: 0 4px 16px var(--shadow-dark), 0 0 20px rgba(0,212,255,0.1);
}

.theme-switch:hover {
    transform: scale(1.05);
}

.switch-icon {
    font-size: 1.4rem;
    transition: transform 0.4s ease;
}

.theme-switch:hover .switch-icon {
    transform: rotate(180deg);
}

/* Líneas decorativas neon */
.neon-lines {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
}

.neon-line {
    position: absolute;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-blue), var(--neon-purple), transparent);
    opacity: 0.3;
    animation: lineMove 6s linear infinite;
}

@keyframes lineMove {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100vw); }
}

/* Footer */
.footer-text {
    margin-top: 40px;
    font-size: 0.9rem;
    letter-spacing: 4px;
    opacity: 0.7;
}

body.light-mode .footer-text {
    color: #636e72;
}

body.dark-mode .footer-text {
    color: #8b949e;
    text-shadow: 0 0 5px rgba(0,255,136,0.2);
}

/* Responsive */
@media (max-width: 768px) {
    .glass-panel {
        padding: 40px 30px;
        margin: 20px;
    }
    .neon-title {
        font-size: 2.8rem;
        letter-spacing: 4px;
    }
    .subtitle {
        font-size: 1.2rem;
        letter-spacing: 3px;
    }
    .theme-switch {
        top: 15px;
        right: 15px;
        padding: 8px 14px;
        font-size: 0.75rem;
    }
}