:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg-gradient-1: #0f172a;
    --bg-gradient-2: #1e1b4b;
    --bg-gradient-3: #312e81;
}

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

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(-45deg, var(--bg-gradient-1), var(--bg-gradient-2), var(--bg-gradient-3), #000000);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    padding: 20px;
    overflow: hidden; /* Evita el scrollbar horizontal por las luces */
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
    transform: translateY(30px);
}

@keyframes slideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-area {
    text-align: center;
    margin-bottom: 35px;
}

.logo-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), #818cf8);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 28px;
    box-shadow: 0 10px 20px -10px var(--primary);
}

.logo-text {
    color: white;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.logo-sub {
    color: #94a3b8;
    font-size: 13px;
    margin-top: 5px;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    transition: all 0.3s ease;
}

.input-control {
    width: 100%;
    padding: 16px 20px 16px 50px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: white;
    font-size: 15px;
    transition: all 0.3s ease;
    outline: none;
}

.input-control::placeholder {
    color: #64748b;
}

.input-control:focus {
    background: rgba(15, 23, 42, 0.8);
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.input-control:focus + i, .input-control:not(:placeholder-shown) + i {
    color: var(--primary);
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary), #6366f1);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px -10px var(--primary);
    margin-top: 10px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -10px var(--primary);
    background: linear-gradient(135deg, var(--primary-hover), #4f46e5);
}

.btn-submit:active {
    transform: translateY(0);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}

/* Ambient light effects */
.ambient-light {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.5;
}
.light-1 {
    top: -10%; left: -10%;
    width: 300px; height: 300px;
    background: rgba(79, 70, 229, 0.4);
}
.light-2 {
    bottom: -10%; right: -10%;
    width: 250px; height: 250px;
    background: rgba(56, 189, 248, 0.3);
}

/* Responsividad para móviles pequeños */
@media (max-width: 480px) {
    .login-container {
        padding: 30px 20px;
    }
    .logo-icon {
        width: 50px;
        height: 50px;
        font-size: 24px;
    }
    .logo-text {
        font-size: 20px;
    }
    .btn-submit {
        font-size: 15px;
    }
}