:root {
    --primary-color: #00d2ff;
    --secondary-color: #3a7bd5;
    --bg-dark: #0f172a;
    --text-light: #f8fafc;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-glow: rgba(0, 210, 255, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    background-image: url('../Imagenes/modern_tech_background.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-light);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.login-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.8s ease-out;
}

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

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

h2.title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

p.subtitle {
    text-align: center;
    color: #94a3b8;
    margin-bottom: 32px;
    font-size: 0.875rem;
}

.input-group {
    position: relative;
    margin-bottom: 20px;
}

.input-group i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #64748b;
    transition: color 0.3s;
}

.input-group input {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 12px 16px 12px 48px;
    color: white;
    font-size: 1rem;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.input-group input:focus+i {
    color: var(--primary-color);
}

button.submit-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 12px;
    padding: 14px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
}

button.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 210, 255, 0.4);
}

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

.error-msg {
    color: #ef4444;
    text-align: center;
    margin-top: 16px;
    font-size: 0.875rem;
    min-height: 1.25rem;
}