/**
 * ==========================================================================
 * AUTHENTICATION PAGES (Login, Forgot Password)
 * ==========================================================================
 *
 * Shared styles for login, forgot password, and other auth-related pages.
 * Used by both teacher and student portals with minor variations.
 *
 * PAGE STRUCTURE:
 * .auth-container (full viewport centered)
 *   ├── .auth-theme-toggle      - Fixed position dark/light toggle
 *   └── .auth-card
 *       ├── .auth-header
 *       │   ├── .auth-logo      - School logo image
 *       │   ├── .auth-badge     - "TEACHER PORTAL" badge (optional)
 *       │   ├── .auth-title     - "Welcome back" etc.
 *       │   └── .auth-subtitle  - Description text
 *       └── .auth-body
 *           ├── .auth-form      - Login form (uses forms.css components)
 *           │   ├── .form-group (email)
 *           │   ├── .form-group (password)
 *           │   ├── .auth-forgot - Forgot password link
 *           │   └── .btn-primary (submit)
 *           ├── .auth-success   - Success message (forgot password)
 *           │   ├── .auth-success-icon
 *           │   ├── .auth-success-title
 *           │   └── .auth-success-text
 *           └── .auth-back      - Back to login link
 *
 * VARIANTS:
 * - .auth-teacher - Adds green top border to card
 *
 * THEME TOGGLE:
 * - Fixed position button in top-right corner
 * - Shows sun icon in light mode, moon in dark mode
 *
 * JAVASCRIPT DEPENDENCY:
 * - js/utils/theme.js - Theme toggle functionality
 *
 * PHP INTEGRATION:
 * - Form action should POST to login handler
 * - Error messages displayed via form validation
 * - Redirect URL can be passed via hidden field
 * - School logo from database configuration
 *
 * RESPONSIVE:
 * - 480px: Reduced padding, smaller border radius
 *
 * ==========================================================================
 */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    background-color: var(--color-bg-secondary);
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.auth-header {
    padding: var(--space-xl) var(--space-xl) var(--space-lg);
    text-align: center;
}

.auth-logo {
    display: inline-block;
    margin-bottom: var(--space-lg);
}

.auth-logo img {
    height: 64px;
    width: auto;
}

.auth-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.auth-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* Teacher Portal Badge */
.auth-badge {
    display: inline-block;
    background-color: var(--color-accent);
    color: white;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
}

/* Teacher-specific styling */
.auth-teacher .auth-card {
    border-top: 3px solid var(--color-accent);
}

.auth-body {
    padding: 0 var(--space-xl) var(--space-xl);
}

.auth-form .form-group {
    margin-bottom: var(--space-md);
}

.auth-form .form-group:last-of-type {
    margin-bottom: var(--space-lg);
}

.auth-form .btn {
    width: 100%;
}

/* Forgot Password Link */
.auth-forgot {
    display: block;
    text-align: right;
    font-size: var(--text-sm);
    color: var(--color-accent);
    margin-top: calc(var(--space-xs) * -1);
    margin-bottom: var(--space-lg);
    transition: color var(--transition-fast);
}

.auth-forgot:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Back to Login Link */
.auth-back {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-light);
}

.auth-back a {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.auth-back a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Success Message for Forgot Password */
.auth-success {
    display: none;
    text-align: center;
    padding: var(--space-lg);
}

.auth-success.is-visible {
    display: block;
}

.auth-success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    color: var(--color-accent);
}

.auth-success-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.auth-success-text {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

/* Theme Toggle on Auth Pages */
.auth-theme-toggle {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 9999px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: background-color 150ms ease, border-color 150ms ease;
    box-shadow: var(--shadow-sm);
}

.auth-theme-toggle:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border);
}

.auth-theme-toggle svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary);
    transition: color 150ms ease;
}

.auth-theme-toggle:hover svg {
    color: var(--color-text-primary);
}

/* Light theme: show sun icon, hide moon */
.auth-theme-toggle .icon-sun {
    display: block;
}

.auth-theme-toggle .icon-moon {
    display: none;
}

/* Dark theme: show moon icon, hide sun */
[data-theme="dark"] .auth-theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .auth-theme-toggle .icon-moon {
    display: block;
}

@media (max-width: 480px) {
    .auth-container {
        padding: var(--space-md);
    }

    .auth-card {
        border-radius: var(--radius-md);
    }

    .auth-header,
    .auth-body {
        padding-left: var(--space-lg);
        padding-right: var(--space-lg);
    }
}