:root {
    /* Colores de marca */
    --color-primary: #1B2C8C;  /* Azul institucional */
    --color-primary-dark: #162577;
    --color-primary-light: #273aa3;
    --color-bg-light: #F5F7FA;  /* Gris claro */
    --color-white: #FFFFFF;
    --color-text-primary: #252B42;
    --color-text-secondary: #606770;
    --color-error: #E53E3E;
    --color-error-bg: #FEE2E2;
    --color-border: #E5E7EB;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Tipografía */
    --font-heading: 'Ellograph CF', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Aktiv Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Espaciado y tamaños */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transiciones */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
}

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

body, html {
    height: 100%;
    width: 100%;
    background-color: var(--color-bg-light);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.login-page {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.login-container {
    width: 100%;
    max-width: 450px;
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.login-header {
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.brand-logo {
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: center;
}

.brand-logo img {
    max-width: 160px;
    height: auto;
    object-fit: cover;
    aspect-ratio: 2/1;
}

.ensamble-logo {
    display: block;
}

.login-header h1 {
    color: var(--color-text-primary);
    font-family: var(--font-heading);
    font-weight: 600; /* Demi Bold */
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
    text-align: center;
}

.login-header p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    text-align: center;
}

.form-field {
    margin-bottom: var(--spacing-md);
}

.form-field label {
    display: block;
    font-family: var(--font-body);
    font-weight: 500; /* Medium */
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.input-wrapper {
    position: relative;
    background-color: var(--color-bg-light);
    border-radius: var(--border-radius-md);
    transition: var(--transition-fast);
}

.input-wrapper:focus-within {
    box-shadow: 0 0 0 2px rgba(27, 44, 140, 0.2);
}

.input-icon {
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
    font-size: 1rem;
}

input[type="email"],
input[type="password"],
input[type="text"] {
    width: 100%;
    background-color: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) calc(var(--spacing-sm) * 2.5);
    font-family: var(--font-body);
    font-weight: 500; /* Medium */
    font-size: 1rem;
    color: var(--color-text-primary);
    outline: none;
}

input[type="password"] {
    padding-right: 2.75rem;
}

.toggle-password {
    position: absolute;
    right: var(--spacing-xs);
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    padding: var(--spacing-xs);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 1rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    z-index: 1;
}

.toggle-password:hover {
    color: var(--color-text-primary);
    background-color: rgba(0, 0, 0, 0.05);
}

.toggle-password:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(27, 44, 140, 0.2);
}

.btn-login {
    width: 100%;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm);
    font-family: var(--font-body);
    font-weight: 500; /* Medium */
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    margin-top: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.btn-login:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
}

.btn-login:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(27, 44, 140, 0.3);
}

.btn-login:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-login.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    right: var(--spacing-md);
    transform: translateY(-50%);
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-white);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: translateY(-50%) rotate(360deg); }
}

.alert {
    background-color: var(--color-error-bg);
    border-left: 4px solid var(--color-error);
    color: var(--color-error);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.alert i {
    font-size: 1rem;
}

.login-footer {
    margin-top: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.login-footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500; /* Medium */
    transition: var(--transition-fast);
}

.login-footer a:hover {
    text-decoration: underline;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shaking {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@media (max-width: 640px) {
    .login-container {
        padding: var(--spacing-lg);
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
}

/* Para fines de accesibilidad */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}