:root {
    /* Colores principales */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-900: #1e3a8a;
    
    /* Colores de estado */
    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;
    --error-600: #dc2626;
    
    /* Neutros */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 0 3px rgba(59, 130, 246, 0.15);
    
    /* Bordes */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Tipografía */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

/* Reset mejorado */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    position: relative;
    overflow-x: hidden;
    color: var(--gray-800);
}

/* ==========================================
   ANIMACIONES DE FONDO (PARTÍCULAS)
   ========================================== */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 15s infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ==========================================
   LAYOUT PRINCIPAL
   ========================================== */
.login-wrapper {
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.1);
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

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

/* ==========================================
   HEADER Y BRANDING
   ========================================== */
.login-header {
    padding: 1.25rem 2rem 1rem;
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-700) 100%);
    color: white;
    text-align: center;
}

.brand-logo {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 52px;
    height: 52px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    animation: pulse 2s infinite;
    overflow: hidden;
    padding: 4px;
    flex-shrink: 0;
}

.logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.brand-info {
    text-align: left;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4); }
    50% { box-shadow: 0 0 0 10px rgba(255, 255, 255, 0); }
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.brand-tagline {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==========================================
   PANEL DE BLOQUEO DE SEGURIDAD
   ========================================== */
.security-lockout {
    padding: 3rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border-bottom: 1px solid var(--gray-200);
}

.security-lockout[hidden] {
    display: none;
}

.lockout-icon {
    width: 80px;
    height: 80px;
    background: var(--error-100);
    color: var(--error-600);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.security-lockout h2 {
    color: var(--error-600);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.security-lockout p {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.timer-container {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin-bottom: 1.5rem;
    border: 2px solid var(--error-500);
    display: inline-flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 150px;
}

.timer-label {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.timer-display {
    font-size: 2rem;
    font-weight: 700;
    color: var(--error-600);
    font-variant-numeric: tabular-nums;
    font-family: 'Courier New', monospace;
}

/* ==========================================
   FORMULARIO
   ========================================== */
.login-form {
    padding: 1.25rem 2rem 1rem;
}

.form-header {
    text-align: center;
    margin-bottom: 1rem;
}

.form-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.15rem;
}

.form-header p {
    font-size: 0.8rem;
    color: var(--gray-500);
}

.form-group {
    margin-bottom: 0.85rem;
    position: relative;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-label i {
    color: var(--primary-500);
    font-size: 0.875rem;
}

.input-wrapper {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    padding-right: 2.5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
    background: white;
    color: var(--gray-900);
}

.form-input:hover {
    border-color: var(--gray-300);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--shadow-glow);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--error-500);
}

.form-input:valid:not(:placeholder-shown) {
    border-color: var(--success-500);
}

/* Validación visual */
.input-validation {
    position: absolute;
    right: 2.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--success-500);
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.form-input:valid:not(:placeholder-shown) ~ .input-validation {
    opacity: 1;
}

/* Toggle de contraseña */
.password-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1rem;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-toggle:hover {
    color: var(--gray-600);
}

.password-toggle:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.password-toggle[aria-pressed="true"] {
    color: var(--primary-500);
}

/* Mensajes de error */
.error-message {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--error-600);
    margin-top: 0.375rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    min-height: 1.25rem;
}

.error-message.visible {
    opacity: 1;
    transform: translateY(0);
}

.error-message::before {
    content: '\f06a';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.875rem;
}

.help-text {
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
    display: block;
}

/* Medidor de fortaleza de contraseña */
.strength-meter {
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.strength-bar {
    flex: 1;
    height: 4px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.strength-bar::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: var(--strength, 0%);
    background: var(--strength-color, var(--gray-300));
    transition: all var(--transition-base);
    border-radius: var(--radius-full);
}

.strength-text {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--strength-color, var(--gray-500));
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

/* ==========================================
   OPCIONES DEL FORMULARIO
   ========================================== */
.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--gray-600);
    user-select: none;
}

.checkbox-wrapper input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
}

.checkbox-wrapper:hover .checkmark {
    border-color: var(--primary-500);
}

.checkbox-wrapper input:checked ~ .checkmark {
    background: var(--primary-500);
    border-color: var(--primary-500);
}

.checkbox-wrapper input:checked ~ .checkmark::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: white;
    font-size: 0.625rem;
}

.checkbox-wrapper input:focus ~ .checkmark {
    box-shadow: var(--shadow-glow);
}

.forgot-link {
    font-size: 0.875rem;
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.forgot-link:hover {
    color: var(--primary-700);
    text-decoration: underline;
}

/* ==========================================
   BOTONES
   ========================================== */
.btn-primary, .btn-secondary {
    width: 100%;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.3);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

.btn-text, .btn-loader {
    transition: opacity var(--transition-fast);
}

.btn-loader {
    position: absolute;
}

.btn-primary:disabled .btn-text,
.btn-primary:disabled .btn-icon {
    opacity: 0;
}

.btn-primary:disabled .btn-loader {
    opacity: 1;
}

.btn-icon {
    transition: transform var(--transition-fast);
}

.btn-primary:hover:not(:disabled) .btn-icon {
    transform: translateX(4px);
}

/* ==========================================
   INFORMACIÓN DE SEGURIDAD
   ========================================== */
.security-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
    font-size: 0.75rem;
    color: var(--gray-500);
}

.security-info i {
    color: var(--success-500);
}

/* ==========================================
   FOOTER
   ========================================== */
.login-footer {
    padding: 0.9rem 2rem;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    text-align: center;
}

.login-footer p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.login-footer a {
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
}

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

.version-info {
    font-size: 0.75rem;
    color: var(--gray-400);
    font-family: 'Courier New', monospace;
}

/* ==========================================
   TOAST NOTIFICATIONS
   ========================================== */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    pointer-events: none;
}

.toast {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    max-width: 400px;
    animation: slideInRight 0.3s ease;
    pointer-events: auto;
    border-left: 4px solid;
}

.toast.success {
    border-left-color: var(--success-500);
}

.toast.error {
    border-left-color: var(--error-500);
}

.toast.warning {
    border-left-color: var(--warning-500);
}

.toast-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.toast.success .toast-icon {
    background: #d1fae5;
    color: var(--success-500);
}

.toast.error .toast-icon {
    background: #fee2e2;
    color: var(--error-500);
}

.toast.warning .toast-icon {
    background: #fef3c7;
    color: var(--warning-500);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--gray-900);
    margin-bottom: 0.125rem;
}

.toast-message {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.toast-close {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1rem;
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--gray-600);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.toast.hiding {
    animation: slideOutRight 0.3s ease forwards;
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 480px) {
    body {
        padding: 0;
        background: var(--gray-100);
    }
    
    .login-wrapper {
        max-width: 100%;
    }
    
    .login-card {
        border-radius: 0;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
    }
    
    .login-form {
        flex: 1;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
    }
    
    .toast {
        min-width: auto;
        max-width: none;
    }
}

/* ==========================================
   REDUCED MOTION
   ========================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================
   FOCUS VISIBLE (ACCESIBILIDAD)
   ========================================== */
:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}