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

/* Variables */
:root {
    --nyx-primary: #ff0000;
    --nyx-secondary: #333333;
    --nyx-white: #ffffff;
    --nyx-light-gray: #f5f5f5;
    --nyx-dark: #222222;
    --nyx-font-primary: 'Arial', sans-serif;
    --nyx-border-radius: 4px;
    --nyx-spacing-sm: 0.5rem;
    --nyx-spacing-md: 1rem;
    --nyx-spacing-lg: 2rem;
    --nyx-spacing-xl: 4rem;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--nyx-font-primary);
    line-height: 1.6;
    color: var(--nyx-dark);
    background-color: var(--nyx-light-gray);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--nyx-spacing-md);
}

/* Header */
.header {
    background-color: var(--nyx-white);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: var(--nyx-spacing-md) 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--nyx-primary);
}

.nav {
    display: flex;
    gap: var(--nyx-spacing-md);
}

.nav-item {
    padding: var(--nyx-spacing-sm) var(--nyx-spacing-md);
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: var(--nyx-border-radius);
}

.nav-item:hover {
    background-color: var(--nyx-primary);
    color: var(--nyx-white);
}

/* Auth Section */
.auth-section {
    padding-top: 100px;
    min-height: calc(100vh - 180px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-container {
    background-color: var(--nyx-white);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    width: 100%;
    max-width: 900px;
    display: flex;
    margin: var(--nyx-spacing-xl) 0;
}

.auth-image {
    flex: 1;
    background-image: url('https://source.unsplash.com/random/800x1200/?newsletter');
    background-size: cover;
    background-position: center;
    position: relative;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 0, 0, 0.5);
}

.auth-form {
    flex: 1;
    padding: var(--nyx-spacing-xl);
}

.auth-title {
    font-size: 2rem;
    color: var(--nyx-primary);
    margin-bottom: var(--nyx-spacing-sm);
}

.auth-subtitle {
    color: var(--nyx-secondary);
    margin-bottom: var(--nyx-spacing-lg);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--nyx-spacing-sm);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: var(--nyx-border-radius);
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--nyx-primary);
}

.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--nyx-spacing-md);
}

.form-check-input {
    margin-right: var(--nyx-spacing-sm);
}

.invalid-feedback {
    color: var(--nyx-primary);
    font-size: 0.875rem;
    margin-top: 5px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--nyx-border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--nyx-primary);
    color: var(--nyx-white);
}

.btn-primary:hover {
    background-color: #e60000;
}

.btn-block {
    display: block;
    width: 100%;
}

.auth-links {
    display: flex;
    justify-content: space-between;
    margin-top: var(--nyx-spacing-lg);
}

.forgot-password, .register-link {
    color: var(--nyx-primary);
    font-size: 0.875rem;
    text-decoration: underline;
}

/* Alert Messages */
.alert {
    padding: 10px 15px;
    margin-bottom: var(--nyx-spacing-md);
    border-radius: var(--nyx-border-radius);
    color: var(--nyx-white);
}

.alert-success {
    background-color: #28a745;
}

.alert-danger {
    background-color: var(--nyx-primary);
}

.alert-warning {
    background-color: #ffc107;
    color: var(--nyx-dark);
}

.alert-info {
    background-color: #17a2b8;
}

/* Footer */
.footer {
    background-color: var(--nyx-dark);
    color: var(--nyx-white);
    text-align: center;
    padding: var(--nyx-spacing-md) 0;
}

/* Responsive adjustments */
@media screen and (max-width: 768px) {
    .auth-container {
        flex-direction: column;
    }
    
    .auth-image {
        height: 200px;
    }
    
    .auth-form {
        padding: var(--nyx-spacing-md);
    }
    
    .auth-links {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}