/* ==================== VARIABLES Y RESET ==================== */
:root {
    /* Colores principales */
    --color-primary: #2A4D69;
    --color-primary-light: #4B86B4;
    --color-secondary: #F1B300;
    --color-accent: #B8332F;
    --color-accent-light: #E04B45;
    
    /* Escala de grises */
    --color-white: #FFFFFF;
    --color-light: #F8F9FA;
    --color-medium: #E9ECEF;
    --color-dark: #333333;
    --color-darker: #212529;
    
    /* Feedback */
    --color-success: #28A745;
    --color-error: var(--color-accent);
    --color-warning: #FFC107;
    --color-info: #17A2B8;
    
    /* Tipografía */
    --font-main: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    --font-size-base: 1rem; /* 16px */
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Bordes */
    --border-radius: 0.5rem;
    --border-width: 1px;
    --border-color: var(--color-medium);
    
    /* Sombras */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    
    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

/* ==================== ESTRUCTURA PRINCIPAL ==================== */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-grow: 1;
    padding: var(--spacing-xl);
    animation: fadeIn var(--transition-slow);
}

.login-container {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 28rem;
    overflow: hidden;
    transform: translateY(0);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.login-container:hover {
    transform: translateY(-0.25rem);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.login-header {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
    background-color: var(--color-primary);
    color: var(--color-white);
}

.login-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

.login-form {
    padding: var(--spacing-xl);
}

/* ==================== FORM ELEMENTS ==================== */
.input-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.input-group input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.5rem;
    font-size: var(--font-size-base);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--color-light);
    transition: all var(--transition-normal);
    color: var(--color-darker);
}

.input-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(42, 77, 105, 0.2);
    background-color: var(--color-white);
}

.input-group label {
    position: absolute;
    top: var(--spacing-md);
    left: 2.5rem;
    color: var(--color-dark);
    pointer-events: none;
    transition: all var(--transition-normal);
}

.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label {
    top: -0.625rem;
    left: 1.25rem;
    font-size: 0.75rem;
    background-color: var(--color-white);
    padding: 0 var(--spacing-xs);
    color: var(--color-primary);
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-primary);
    font-size: 1.25rem;
}

/* ==================== FORM OPTIONS ==================== */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    font-size: 0.875rem;
}

.remember-me {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.remember-me input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    display: inline-block;
    width: 1.125rem;
    height: 1.125rem;
    margin-right: var(--spacing-sm);
    background-color: var(--color-light);
    border: var(--border-width) solid var(--border-color);
    border-radius: 0.25rem;
    transition: all var(--transition-fast);
}

.remember-me:hover .checkmark {
    background-color: var(--color-medium);
}

.remember-me input:checked ~ .checkmark {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.remember-me input:focus ~ .checkmark {
    box-shadow: 0 0 0 3px rgba(42, 77, 105, 0.2);
}

.forgot-password {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.forgot-password:hover {
    color: var(--color-accent-light);
    text-decoration: underline;
}

/* ==================== BUTTON ==================== */
.login-button {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
}

.login-button:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.login-button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.login-button .button-icon {
    font-size: 1.25rem;
}

/* ==================== ERROR MESSAGE ==================== */
.login-error {
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    background-color: rgba(184, 51, 47, 0.1);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.login-error.show {
    opacity: 1;
    max-height: 5rem;
    margin-top: var(--spacing-md);
}

/* ==================== FOOTER ==================== */
.login-footer {
    text-align: center;
    padding: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--color-dark);
    opacity: 0.7;
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-8px); }
    40%, 80% { transform: translateX(8px); }
}

.shake {
    animation: shake 0.4s ease-in-out;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    .login-wrapper {
        padding: var(--spacing-md);
    }
    
    .login-container {
        max-width: 100%;
    }
    
    .login-header {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .login-form {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .login-button .button-text {
        display: none;
    }
    
    .login-button .button-icon {
        font-size: 1.5rem;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .forgot-password {
        align-self: flex-end;
    }
}