/**
 * login.css
 * Estilos personalizados para página de login
 * SIAF 2025 - Gobierno de Chiapas
 */

/* ============================================
   VARIABLES DE COLORES INSTITUCIONALES
   ============================================ */
:root {
    --color-verde-turquesa: #1B9B8E;
    --color-magenta: #A8255D;
    --color-turquesa-claro: #35B7AD;
    --color-gris-oscuro: #5A5A5A;
    --color-negro: #1A1A1A;
    --color-blanco: #FFFFFF;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, var(--color-verde-turquesa) 0%, var(--color-turquesa-claro) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-magenta) 0%, #C92D74 100%);
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.25);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ============================================
   RESET Y BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-gris-oscuro);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ============================================
   FONDO CON GRADIENTE ANIMADO
   ============================================ */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% {
        background: linear-gradient(135deg, var(--color-verde-turquesa) 0%, var(--color-turquesa-claro) 100%);
    }
    50% {
        background: linear-gradient(135deg, var(--color-turquesa-claro) 0%, var(--color-verde-turquesa) 100%);
    }
}

/* Patrón decorativo de fondo */
.background-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

/* ============================================
   CARD DE LOGIN
   ============================================ */
.login-card {
    background: var(--color-blanco);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease;
    position: relative;
    overflow: hidden;
}

/* Efecto de brillo sutil */
.login-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   HEADER DEL LOGIN
   ============================================ */
.login-header {
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.logos-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 2rem;
}

.logo-principal {
    max-width: 280px;
    height: auto;
    animation: fadeIn 0.8s ease;
    filter: drop-shadow(var(--shadow-sm));
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.sistema-titulo {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.sistema-subtitulo {
    font-size: 1rem;
    color: var(--color-gris-oscuro);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.divider {
    width: 80px;
    height: 3px;
    background: var(--gradient-accent);
    margin: 1.5rem auto;
    border-radius: 2px;
}

.login-titulo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-negro);
    margin-bottom: 0;
}

/* ============================================
   FORMULARIO
   ============================================ */
.login-form {
    position: relative;
    z-index: 1;
}

/* Form Controls Mejorados */
.form-floating > .form-control {
    border: 2px solid #E0E0E0;
    border-radius: 12px;
    padding: 1rem 1rem;
    font-size: 1rem;
    transition: all var(--transition-normal);
    background-color: #FAFAFA;
}

.form-floating > .form-control:focus {
    border-color: var(--color-turquesa-claro);
    background-color: var(--color-blanco);
    box-shadow: 0 0 0 4px rgba(53, 183, 173, 0.1);
    outline: none;
}

.form-floating > label {
    color: var(--color-gris-oscuro);
    font-weight: 500;
    padding: 1rem;
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label {
    color: var(--color-turquesa-claro);
}

/* Botón para mostrar/ocultar contraseña */
.btn-toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-gris-oscuro);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1.2rem;
    transition: color var(--transition-fast);
    z-index: 10;
}

.btn-toggle-password:hover {
    color: var(--color-turquesa-claro);
}

/* Checkbox Personalizado */
.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid #E0E0E0;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-check-input:checked {
    background-color: var(--color-turquesa-claro);
    border-color: var(--color-turquesa-claro);
}

.form-check-input:focus {
    box-shadow: 0 0 0 4px rgba(53, 183, 173, 0.15);
    border-color: var(--color-turquesa-claro);
}

.form-check-label {
    color: var(--color-gris-oscuro);
    font-size: 0.95rem;
    cursor: pointer;
    user-select: none;
}

/* ============================================
   BOTÓN DE LOGIN
   ============================================ */
.btn-login {
    padding: 0.875rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    background: var(--gradient-accent);
    color: var(--color-blanco);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-login:hover::before {
    left: 100%;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-login:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* ============================================
   ALERTAS
   ============================================ */
.alert {
    border-radius: 12px;
    border: none;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    animation: slideDown 0.3s ease;
    box-shadow: var(--shadow-sm);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-danger {
    background-color: #FEE;
    color: #C00;
    border-left: 4px solid #C00;
}

.alert-warning {
    background-color: #FFF3CD;
    color: #856404;
    border-left: 4px solid #FFC107;
}

.alert-success {
    background-color: #D4EDDA;
    color: #155724;
    border-left: 4px solid #28A745;
}

/* ============================================
   CONTADOR DE INTENTOS
   ============================================ */
.intentos-restantes {
    text-align: center;
    padding: 0.75rem;
    background-color: #FFF3CD;
    border-left: 4px solid #FFC107;
    border-radius: 8px;
    color: #856404;
    font-size: 0.9rem;
    font-weight: 500;
}

/* ============================================
   FOOTER
   ============================================ */
.login-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #E0E0E0;
}

.copyright {
    font-size: 0.85rem;
    color: var(--color-gris-oscuro);
    margin: 0;
    line-height: 1.6;
}

/* ============================================
   VALIDACIÓN DE FORMULARIO
   ============================================ */
.form-control.is-invalid {
    border-color: #DC3545;
    background-image: none;
}

.form-control.is-valid {
    border-color: #28A745;
    background-image: none;
}

.invalid-feedback {
    display: none;
    font-size: 0.875rem;
    color: #DC3545;
    margin-top: 0.5rem;
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .login-card {
        padding: 2rem 1.5rem;
        border-radius: 16px;
    }
    
    .logo-principal {
        max-width: 200px;
    }
    
    .sistema-titulo {
        font-size: 2rem;
    }
    
    .sistema-subtitulo {
        font-size: 0.9rem;
    }
    
    .login-titulo {
        font-size: 1.25rem;
    }
}

@media (max-width: 576px) {
    .login-card {
        padding: 1.5rem;
    }
    
    .logo-principal {
        max-width: 160px;
    }
    
    .sistema-titulo {
        font-size: 1.75rem;
    }
}

/* ============================================
   ANIMACIONES ADICIONALES
   ============================================ */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}