/* ============================================
   Multi-App Authentication Server - Styles
   Modern, Clean, Professional Design
   ============================================ */

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

:root {
    /* Color Palette */
    --primary-color: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #8B5CF6;
    --secondary-color: #64748B;
    --success-color: #10B981;
    --error-color: #EF4444;
    --warning-color: #F59E0B;
    
    /* Neutral Colors */
    --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;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 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);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Body & Typography */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--gray-900);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

/* Container */
.container {
    width: 100%;
    max-width: 480px;
}

/* Auth Box */
.auth-box {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* Auth Header */
.auth-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
}

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

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.95;
    margin: 0;
}

/* Auth Content */
.auth-content {
    padding: var(--spacing-2xl) var(--spacing-xl);
}

.auth-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.description {
    color: var(--gray-600);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* Alerts */
.alert {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
}

.alert svg {
    flex-shrink: 0;
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
    border: 1px solid #FCA5A5;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
    border: 1px solid #6EE7B7;
}

.alert-warning {
    background: #FEF3C7;
    color: #92400E;
    border: 1px solid #FCD34D;
}

/* Form Styles */
.auth-form {
    margin-bottom: var(--spacing-xl);
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-hint {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: var(--spacing-xs);
}

/* 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: 0.9rem;
    color: var(--gray-700);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    outline: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
}

.btn-block {
    width: 100%;
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Links */
.link {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.link-primary {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

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

/* Divider */
.auth-divider {
    position: relative;
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-300);
}

.auth-divider span {
    position: relative;
    display: inline-block;
    padding: 0 var(--spacing-md);
    background: white;
    color: var(--gray-500);
    font-size: 0.85rem;
    font-weight: 600;
}

/* Auth Alternative */
.auth-alternative {
    text-align: center;
}

.auth-alternative p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* Auth Footer */
.auth-footer {
    background: var(--gray-50);
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: center;
    border-top: 1px solid var(--gray-200);
}

.auth-footer p {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin: var(--spacing-sm) 0;
}

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

.footer-links a {
    color: var(--primary-color);
    text-decoration: none;
}

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

.footer-links span {
    color: var(--gray-400);
}

/* OAuth Authorize Styles */
.oauth-authorize {
    text-align: center;
}

.app-info {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 2px solid var(--gray-200);
}

.app-icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.app-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.app-description {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.user-avatar {
    flex-shrink: 0;
}

.user-avatar img {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.user-details {
    flex: 1;
    text-align: left;
}

.user-name {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.user-email {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* Permissions Box */
.permissions-box {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    text-align: left;
}

.permissions-box h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.permissions-list {
    list-style: none;
}

.permissions-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.permissions-list li svg {
    color: var(--success-color);
    flex-shrink: 0;
}

/* OAuth Info */
.oauth-info {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-200);
}

.info-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--gray-600);
    text-align: center;
}

.info-text svg {
    flex-shrink: 0;
    color: var(--gray-400);
}

/* Success & Error Pages */
.success-message,
.error-message {
    text-align: center;
}

.success-icon,
.error-icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.user-info-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.info-box {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

.info-box p {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* Responsive Design */
@media (max-width: 640px) {
    body {
        padding: var(--spacing-md);
    }
    
    .auth-header {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .auth-content {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .auth-content h2 {
        font-size: 1.25rem;
    }
    
    .button-group {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
}

/* Loading State */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: 50%;
    left: 50%;
    margin-left: -0.5rem;
    margin-top: -0.5rem;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spinner 0.6s linear infinite;
}

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

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}