/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Professional Color Palette - Strength, Confidence, Security */
    --primary-color: #1e40af;
    --primary-dark: #1e3a8a;
    --primary-light: #3b82f6;
    --secondary-color: #374151;
    --accent-color: #059669;
    --success-color: #059669;
    --warning-color: #d97706;
    --error-color: #dc2626;
    
    /* Neutral Colors */
    --white: #ffffff;
    --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;
    --black: #000000;
    
    /* Professional Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color) 0%, var(--gray-800) 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Auth Container */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
    background: var(--gradient-primary);
}

/* Auth Background */
.auth-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.stars {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, var(--white), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, var(--white), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.6), transparent),
        radial-gradient(2px 2px at 160px 30px, var(--white), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: twinkle 20s linear infinite;
    opacity: 0.3;
}

.twinkling {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(1px 1px at 25px 5px, var(--white), transparent),
        radial-gradient(1px 1px at 50px 25px, var(--white), transparent),
        radial-gradient(1px 1px at 125px 20px, var(--white), transparent),
        radial-gradient(1.5px 1.5px at 50px 75px, var(--white), transparent),
        radial-gradient(2px 2px at 15px 125px, var(--white), transparent),
        radial-gradient(2.5px 2.5px at 110px 80px, var(--white), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: twinkle 15s linear infinite;
    opacity: 0.2;
}

.clouds {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(4px 4px at 100px 50px, rgba(255,255,255,0.1), transparent),
        radial-gradient(6px 6px at 200px 150px, rgba(255,255,255,0.1), transparent),
        radial-gradient(3px 3px at 300px 250px, rgba(255,255,255,0.1), transparent);
    background-repeat: repeat;
    background-size: 400px 200px;
    animation: float 30s linear infinite;
}

@keyframes twinkle {
    0% { opacity: 0.3; }
    50% { opacity: 1; }
    100% { opacity: 0.3; }
}

@keyframes float {
    0% { transform: translateX(0px); }
    100% { transform: translateX(-400px); }
}

/* Auth Card */
.auth-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    width: 100%;
    max-width: 450px;
    position: relative;
    z-index: 2;
    overflow: hidden;
    animation: slideInUp 0.6s ease-out;
}

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

/* Auth Header */
.auth-header {
    background: var(--gradient-primary);
    padding: var(--spacing-2xl);
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--white);
    line-height: 1;
}

.logo-subtitle {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 400;
}

/* Auth Content */
.auth-content {
    padding: var(--spacing-3xl);
}

.auth-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.auth-subtitle {
    font-size: 1rem;
    color: var(--gray-600);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.auth-description {
    font-size: 1rem;
    color: var(--gray-600);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

/* Auth Form */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-size: 1rem;
    background: var(--white);
    transition: all var(--transition-normal);
    color: var(--gray-900);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-group input::placeholder {
    color: var(--gray-400);
}

/* Credential Inputs */
.credential-input {
    background: #e0f2fe !important;
    border-color: #0284c7 !important;
}

/* Input Actions */
.input-action {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.input-action:hover {
    color: var(--primary-color);
    background: var(--gray-100);
}

/* Password Toggle */
.password-toggle {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.password-toggle:hover {
    color: var(--primary-color);
    background: var(--gray-100);
}

/* Form Separator */
.form-separator {
    text-align: center;
    margin: var(--spacing-xl) 0;
    position: relative;
}

.form-separator::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-200);
    z-index: 1;
}

.form-separator span {
    background: var(--white);
    padding: 0 var(--spacing-lg);
    color: var(--gray-500);
    font-size: 0.875rem;
    position: relative;
    z-index: 2;
}

/* Password Strength */
.password-strength {
    margin-top: var(--spacing-md);
}

.strength-bar {
    width: 100%;
    height: 4px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.strength-fill {
    height: 100%;
    background: var(--warning-color);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    width: 75%;
}

.strength-fill.weak {
    background: var(--error-color);
    width: 25%;
}

.strength-fill.medium {
    background: var(--warning-color);
    width: 50%;
}

.strength-fill.strong {
    background: var(--success-color);
    width: 75%;
}

.strength-fill.very-strong {
    background: var(--success-color);
    width: 100%;
}

.password-requirements {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.requirement {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-600);
}

.requirement i {
    font-size: 0.75rem;
    width: 16px;
    text-align: center;
}

.requirement.met {
    color: var(--success-color);
}

.requirement.met i {
    color: var(--success-color);
}

.requirement.not-met {
    color: var(--gray-500);
}

.requirement.not-met i {
    color: var(--gray-400);
}

/* Form Options */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-700);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.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-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    color: var(--white);
    font-size: 0.75rem;
    font-weight: bold;
}

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

.forgot-link:hover {
    color: var(--primary-dark);
}

.terms-link {
    color: var(--primary-color);
    text-decoration: underline;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.terms-link:hover {
    color: var(--primary-dark);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 48px;
}

.btn::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 var(--transition-slow);
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-lg);
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--white);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    width: 100%;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.form-actions .btn {
    flex: 1;
}

/* Auth Footer */
.auth-footer {
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
}

.auth-footer p {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin: 0;
}

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

.auth-footer a:hover {
    color: var(--primary-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    .auth-container {
        padding: var(--spacing-md);
    }
    
    .auth-card {
        max-width: 100%;
    }
    
    .auth-content {
        padding: var(--spacing-2xl);
    }
    
    .auth-title {
        font-size: 1.75rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .auth-content {
        padding: var(--spacing-xl);
    }
    
    .auth-title {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.875rem;
    }
}

/* Loading States */
.btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: var(--spacing-sm);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Success/Error States */
.form-group.success input {
    border-color: var(--success-color);
}

.form-group.error input {
    border-color: var(--error-color);
}

.form-group .error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.form-group .success-message {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --secondary-color: #008000;
        --gray-900: #000000;
        --gray-100: #ffffff;
    }
} 

/* Logo Link Styles */
.logo-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition-normal);
}

.logo-link:hover {
    transform: scale(1.02);
}

.logo-link:hover .logo-icon {
    box-shadow: var(--shadow-lg);
}

.logo-link:hover .logo-name {
    color: var(--primary-color);
}