:root {
    --primary: #ff6b6b;
    --secondary: #4ecdc4;
    --dark: #2d3436;
    --light: #f7f7f7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}

body {
    min-height: 100vh;
    background: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* Estilos de Login Container */
.login-container {
    width: min(450px, 90%);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: clamp(20px, 5vw, 40px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    transform-style: preserve-3d;
    perspective: 1000px;
    margin: 20px;
}

.login-header {
    text-align: center;
    margin-bottom: clamp(20px, 5vw, 40px);
    transform-style: preserve-3d;
    perspective: 1000px;
}

.logo-container {
    width: clamp(80px, 20vw, 120px);
    height: clamp(80px, 20vw, 120px);
    margin: 0 auto 20px;
    position: relative;
    transform-style: preserve-3d;
    animation: logoFloat 4s infinite ease-in-out;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0) rotateX(0); }
    50% { transform: translateY(-10px) rotateX(5deg); }
}

.logo-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transform: translateZ(30px);
    filter: drop-shadow(0 10px 15px rgba(0, 0, 0, 0.2));
}

.logo-glow {
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(255, 107, 107, 0.2), transparent 70%);
    animation: glowPulse 2s infinite ease-in-out;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.5; }
}

/* Estilos de Formulario */
.form-group {
    margin-bottom: 25px;
    position: relative;
    transform-style: preserve-3d;
    transform: translateZ(30px);
}

.form-input {
    width: 100%;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--light);
    font-size: clamp(14px, 3vw, 16px);
    transition: all 0.3s ease;
}

.form-label {
    position: absolute;
    left: 20px;
    top: 15px;
    color: rgba(255, 255, 255, 0.6);
    font-size: clamp(14px, 3vw, 16px);
    transition: all 0.3s ease;
    pointer-events: none;
}

.form-input:focus ~ .form-label,
.form-input:not(:placeholder-shown) ~ .form-label {
    transform: translateY(-25px) scale(0.8);
    color: var(--primary);
}

.login-button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 10px;
    color: white;
    font-size: clamp(16px, 3vw, 18px);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    transform: translateZ(40px);
    position: relative;
    overflow: hidden;
}

/* Animaciones de Partículas y Elementos */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: clamp(5px, 2vw, 10px);
    height: clamp(5px, 2vw, 10px);
    background: var(--primary);
    border-radius: 50%;
    animation: particleFloat 8s infinite linear;
    opacity: 0.3;
}

@keyframes particleFloat {
    0% {
        transform: translate(0, 0) rotate(0deg);
    }
    100% {
        transform: translate(100vw, 100vh) rotate(360deg);
    }
}

.fitness-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    overflow: hidden;
}

.element {
    position: absolute;
    font-size: clamp(20px, 4vw, 24px);
    color: rgba(255, 255, 255, 0.1);
    animation: elementFloat 20s infinite linear;
}

@keyframes elementFloat {
    0% {
        transform: translate(-100%, -100%) rotate(0deg);
    }
    25% {
        transform: translate(100%, 0%) rotate(90deg);
    }
    50% {
        transform: translate(100%, 100%) rotate(180deg);
    }
    75% {
        transform: translate(0%, 100%) rotate(270deg);
    }
    100% {
        transform: translate(-100%, -100%) rotate(360deg);
    }
}

/* Media Queries */
@media (max-width: 768px) {
    .login-container {
        padding: 20px;
        margin: 10px;
    }

    .login-header h1 {
        font-size: 2em;
    }

    .form-group {
        margin-bottom: 20px;
    }

    .logo-container {
        margin-bottom: 15px;
    }
}

@media (max-width: 480px) {
    .login-container {
        width: 95%;
    }

    .form-input {
        padding: 12px 15px;
    }

    .login-button {
        padding: 12px;
    }
}

/* Accesibilidad */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Soporte para modo oscuro del sistema */
@media (prefers-color-scheme: dark) {
    :root {
        --dark: #1a1a1a;
    }
}