/*
 * StudentFocus Design System
 * Modal Components
 *
 * Complete modal system with backdrop, animations, and variants
 * Supports forms, confirmations, and full-screen modes
 */

/* ============================================
   BASE MODAL STRUCTURE
   ============================================ */

/**
 * Modal Backdrop
 * Full-screen overlay that contains the modal
 * Handles centering and scrolling behavior
 */
.sf-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--sf-z-modal-backdrop);
    background-color: rgba(0, 0, 0, 0.5); /* Semi-transparent black overlay */
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--sf-space-4);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.sf-modal-backdrop[data-open="true"],
.sf-modal-backdrop.is-open {
    display: flex;
    animation: sf-modal-backdrop-fade-in var(--sf-transition-base);
}

/**
 * Modal Content Container
 * The actual modal box with content
 */
.sf-modal-content {
    position: relative;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    background-color: white;
    border-radius: var(--sf-radius-2xl);
    box-shadow: var(--sf-shadow-2xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: sf-modal-slide-up var(--sf-transition-slow);
    margin: auto; /* Centers in flexbox when content is smaller than viewport */
}

/* ============================================
   MODAL SECTIONS
   ============================================ */

/**
 * Modal Header
 * Contains title and close button
 */
.sf-modal-header,
.sf-modal__header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sf-space-4);
    padding: var(--sf-space-5) var(--sf-space-6);
    border-bottom: 1px solid var(--sf-neutral-200);
    background-color: white;
}

.sf-modal-title,
.sf-modal__title {
    margin: 0;
    font-size: var(--sf-text-xl);
    font-weight: var(--sf-font-bold);
    color: var(--sf-neutral-900);
    line-height: var(--sf-leading-tight);
    flex: 1;
}

.sf-modal-close,
.sf-modal__close {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--sf-radius-full);
    color: var(--sf-neutral-600);
    cursor: pointer;
    transition: all var(--sf-transition-fast);
    padding: 0;
}

.sf-modal-close:hover,
.sf-modal__close:hover {
    background-color: var(--sf-neutral-100);
    color: var(--sf-neutral-900);
}

.sf-modal-close:focus,
.sf-modal__close:focus {
    outline: 2px solid var(--sf-primary-500);
    outline-offset: 2px;
}

/**
 * Modal Body
 * Main content area with independent scrolling
 */
.sf-modal-body,
.sf-modal__body {
    flex: 1;
    padding: var(--sf-space-6);
    overflow-y: auto;
    overflow-x: hidden;
    background-color: white;
}

/* Smooth scrolling behavior */
.sf-modal-body {
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--sf-neutral-300) transparent;
}

.sf-modal-body::-webkit-scrollbar {
    width: 8px;
}

.sf-modal-body::-webkit-scrollbar-track {
    background: transparent;
}

.sf-modal-body::-webkit-scrollbar-thumb {
    background-color: var(--sf-neutral-300);
    border-radius: var(--sf-radius-full);
}

.sf-modal-body::-webkit-scrollbar-thumb:hover {
    background-color: var(--sf-neutral-400);
}

/**
 * Modal Footer
 * Action buttons area, stays visible while scrolling
 */
.sf-modal-footer,
.sf-modal__footer {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--sf-space-3);
    padding: var(--sf-space-5) var(--sf-space-6);
    border-top: 1px solid var(--sf-neutral-200);
    background-color: white;
    position: sticky;
    bottom: 0;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
}

.sf-modal-footer .btn,
.sf-modal__footer .btn,
.sf-modal-footer .sf-btn,
.sf-modal__footer .sf-btn {
    min-width: 100px;
}

/* ============================================
   MODAL SIZE VARIANTS
   ============================================ */

/* Small Modal (400px) */
.sf-modal-content.modal-sm {
    max-width: 400px;
}

/* Medium Modal (600px - default) */
.sf-modal-content.modal-md {
    max-width: 600px;
}

/* Large Modal (800px) */
.sf-modal-content.modal-lg {
    max-width: 800px;
}

/* Extra Large Modal (1000px) */
.sf-modal-content.modal-xl {
    max-width: 1000px;
}

/* Full Width Modal (95% of viewport) */
.sf-modal-content.modal-full {
    max-width: 95vw;
}

/* ============================================
   MODAL STYLE VARIANTS
   ============================================ */

/**
 * Colored Header Variants
 * Matches card header patterns
 */
.sf-modal-header.bg-primary,
.sf-modal__header.bg-primary {
    background-color: var(--sf-primary-600);
    border-bottom-color: var(--sf-primary-700);
}

.sf-modal-header.bg-primary .sf-modal-title,
.sf-modal-header.bg-primary .sf-modal__title,
.sf-modal-header.bg-primary .sf-modal-close,
.sf-modal-header.bg-primary .sf-modal__close,
.sf-modal__header.bg-primary .sf-modal-title,
.sf-modal__header.bg-primary .sf-modal__title,
.sf-modal__header.bg-primary .sf-modal-close,
.sf-modal__header.bg-primary .sf-modal__close {
    color: white;
}

.sf-modal-header.bg-success,
.sf-modal__header.bg-success {
    background-color: var(--sf-success-600);
    border-bottom-color: var(--sf-success-700);
}

.sf-modal-header.bg-success .sf-modal-title,
.sf-modal-header.bg-success .sf-modal__title,
.sf-modal-header.bg-success .sf-modal-close,
.sf-modal-header.bg-success .sf-modal__close,
.sf-modal__header.bg-success .sf-modal-title,
.sf-modal__header.bg-success .sf-modal__title,
.sf-modal__header.bg-success .sf-modal-close,
.sf-modal__header.bg-success .sf-modal__close {
    color: white;
}

.sf-modal-header.bg-warning,
.sf-modal__header.bg-warning {
    background-color: var(--sf-warning-600);
    border-bottom-color: var(--sf-warning-700);
}

.sf-modal-header.bg-warning .sf-modal-title,
.sf-modal-header.bg-warning .sf-modal__title,
.sf-modal__header.bg-warning .sf-modal-title,
.sf-modal__header.bg-warning .sf-modal__title {
    color: var(--sf-neutral-900);
}

.sf-modal-header.bg-error,
.sf-modal-header.bg-danger,
.sf-modal__header.bg-error,
.sf-modal__header.bg-danger {
    background-color: var(--sf-error-600);
    border-bottom-color: var(--sf-error-700);
}

.sf-modal-header.bg-error .sf-modal-title,
.sf-modal-header.bg-error .sf-modal__title,
.sf-modal-header.bg-error .sf-modal-close,
.sf-modal-header.bg-error .sf-modal__close,
.sf-modal-header.bg-danger .sf-modal-title,
.sf-modal-header.bg-danger .sf-modal__title,
.sf-modal-header.bg-danger .sf-modal-close,
.sf-modal-header.bg-danger .sf-modal__close,
.sf-modal__header.bg-error .sf-modal-title,
.sf-modal__header.bg-error .sf-modal__title,
.sf-modal__header.bg-error .sf-modal-close,
.sf-modal__header.bg-error .sf-modal__close,
.sf-modal__header.bg-danger .sf-modal-title,
.sf-modal__header.bg-danger .sf-modal__title,
.sf-modal__header.bg-danger .sf-modal-close,
.sf-modal__header.bg-danger .sf-modal__close {
    color: white;
}

/**
 * Compact Modal
 * Reduced padding for smaller modals
 */
.sf-modal-content.modal-compact .sf-modal-header,
.sf-modal-content.modal-compact .sf-modal__header {
    padding: var(--sf-space-4) var(--sf-space-5);
}

.sf-modal-content.modal-compact .sf-modal-body,
.sf-modal-content.modal-compact .sf-modal__body {
    padding: var(--sf-space-4);
}

.sf-modal-content.modal-compact .sf-modal-footer,
.sf-modal-content.modal-compact .sf-modal__footer {
    padding: var(--sf-space-4) var(--sf-space-5);
}

/**
 * Centered Modal
 * Centers content within modal body
 */
.sf-modal-body.modal-centered,
.sf-modal__body.modal-centered {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

/* ============================================
   MODAL ANIMATIONS
   ============================================ */

@keyframes sf-modal-backdrop-fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes sf-modal-slide-up {
    from {
        transform: translateY(var(--sf-space-8));
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes sf-modal-slide-down {
    from {
        transform: translateY(0);
        opacity: 1;
    }
    to {
        transform: translateY(var(--sf-space-8));
        opacity: 0;
    }
}

@keyframes sf-modal-backdrop-fade-out {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

/* Close Animation */
.sf-modal-backdrop.is-closing {
    animation: sf-modal-backdrop-fade-out var(--sf-transition-base);
}

.sf-modal-backdrop.is-closing .sf-modal-content {
    animation: sf-modal-slide-down var(--sf-transition-base);
}

/* ============================================
   CONFIRMATION DIALOG VARIANT
   ============================================ */

/**
 * Confirmation Dialog
 * Specialized modal for yes/no decisions
 */
.sf-modal-confirm .sf-modal-content,
.sf-modal-dialog .sf-modal-content {
    max-width: 480px;
}

.sf-modal-confirm .sf-modal-body,
.sf-modal-dialog .sf-modal-body,
.sf-modal-confirm .sf-modal__body,
.sf-modal-dialog .sf-modal__body {
    padding: var(--sf-space-6);
    text-align: center;
}

.sf-modal-confirm-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--sf-space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--sf-radius-full);
    font-size: var(--sf-text-3xl);
}

.sf-modal-confirm-icon.icon-success {
    background-color: var(--sf-success-100);
    color: var(--sf-success-700);
}

.sf-modal-confirm-icon.icon-warning {
    background-color: var(--sf-warning-100);
    color: var(--sf-warning-700);
}

.sf-modal-confirm-icon.icon-error {
    background-color: var(--sf-error-100);
    color: var(--sf-error-700);
}

.sf-modal-confirm-icon.icon-info {
    background-color: var(--sf-info-100);
    color: var(--sf-info-700);
}

.sf-modal-confirm-title {
    font-size: var(--sf-text-xl);
    font-weight: var(--sf-font-bold);
    color: var(--sf-neutral-900);
    margin-bottom: var(--sf-space-3);
}

.sf-modal-confirm-message {
    font-size: var(--sf-text-base);
    color: var(--sf-neutral-600);
    line-height: var(--sf-leading-relaxed);
    margin-bottom: 0;
}

.sf-modal-confirm .sf-modal-footer,
.sf-modal-dialog .sf-modal-footer,
.sf-modal-confirm .sf-modal__footer,
.sf-modal-dialog .sf-modal__footer {
    justify-content: center;
    gap: var(--sf-space-3);
}

/* ============================================
   FORM MODAL HELPERS
   ============================================ */

/**
 * Form Layout Helpers
 * Common patterns for forms in modals
 */
.sf-modal-form-stack {
    display: flex;
    flex-direction: column;
    gap: var(--sf-space-5);
}

.sf-modal-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sf-space-4);
    align-items: start;
}

.sf-modal-form-row-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sf-space-4);
    align-items: start;
}

/**
 * Form Field Container
 * Ensures labels are always on top
 */
.sf-field,
.sf-modal-field {
    display: flex;
    flex-direction: column;
    gap: var(--sf-space-2);
}

/**
 * Form Labels
 * Always positioned above inputs
 */
.sf-label,
.sf-modal-label {
    display: block;
    font-weight: var(--sf-font-medium);
    color: var(--sf-neutral-700);
    font-size: var(--sf-text-sm);
    margin-bottom: var(--sf-space-2);
    line-height: var(--sf-leading-normal);
}

.sf-label--required::after,
.sf-modal-label--required::after {
    content: " *";
    color: var(--sf-error-600);
}

/**
 * Form Inputs
 * Consistent styling with rounded corners and proper padding
 */
.sf-input,
.sf-select,
.sf-textarea,
.sf-modal-input,
.sf-modal-select,
.sf-modal-textarea {
    width: 100%;
    padding: var(--sf-space-3) var(--sf-space-4);
    font-family: var(--sf-font-primary);
    font-size: var(--sf-text-base);
    line-height: var(--sf-leading-normal);
    color: var(--sf-neutral-900);
    background-color: white;
    border: 2px solid var(--sf-neutral-300);
    border-radius: var(--sf-radius-lg);
    transition: all var(--sf-transition-fast);
}

.sf-input:hover,
.sf-select:hover,
.sf-textarea:hover,
.sf-modal-input:hover,
.sf-modal-select:hover,
.sf-modal-textarea:hover {
    border-color: var(--sf-neutral-400);
}

.sf-input:focus,
.sf-select:focus,
.sf-textarea:focus,
.sf-modal-input:focus,
.sf-modal-select:focus,
.sf-modal-textarea:focus {
    outline: none;
    border-color: var(--sf-primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.sf-input:disabled,
.sf-select:disabled,
.sf-textarea:disabled,
.sf-modal-input:disabled,
.sf-modal-select:disabled,
.sf-modal-textarea:disabled {
    background-color: var(--sf-neutral-100);
    cursor: not-allowed;
    opacity: 0.6;
}

/**
 * Textarea Specific Styling
 * Multiline text inputs with proper sizing
 */
.sf-textarea,
.sf-modal-textarea {
    min-height: 100px;
    resize: vertical;
    font-family: inherit;
    line-height: var(--sf-leading-relaxed);
}

/* Ensure consistent height for single-line inputs */
.sf-input,
.sf-select,
.sf-modal-input,
.sf-modal-select {
    min-height: 44px;
}

/* Advanced Options Section */
.sf-modal-advanced-options {
    padding: var(--sf-space-5);
    background-color: var(--sf-neutral-50);
    border: 1px solid var(--sf-neutral-200);
    border-radius: var(--sf-radius-lg);
    margin-top: var(--sf-space-3);
}

.sf-modal-advanced-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--sf-space-2);
    background: transparent;
    border: none;
    color: var(--sf-primary-600);
    font-weight: var(--sf-font-medium);
    font-size: var(--sf-text-sm);
    cursor: pointer;
    padding: var(--sf-space-2) 0;
    transition: color var(--sf-transition-fast);
}

.sf-modal-advanced-toggle:hover {
    color: var(--sf-primary-700);
}

/**
 * Validation States
 */
.sf-input.is-invalid,
.sf-select.is-invalid,
.sf-textarea.is-invalid,
.form-control.is-invalid {
    border-color: var(--sf-error-500);
}

.sf-input.is-invalid:focus,
.sf-select.is-invalid:focus,
.sf-textarea.is-invalid:focus,
.form-control.is-invalid:focus {
    border-color: var(--sf-error-500);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.sf-input.is-valid,
.sf-select.is-valid,
.sf-textarea.is-valid,
.form-control.is-valid {
    border-color: var(--sf-success-500);
}

.sf-input.is-valid:focus,
.sf-select.is-valid:focus,
.sf-textarea.is-valid:focus,
.form-control.is-valid:focus {
    border-color: var(--sf-success-500);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/**
 * Form Helper Text
 */
.sf-help-text,
.sf-form-hint,
.form-hint {
    display: block;
    margin-top: var(--sf-space-2);
    font-size: var(--sf-text-sm);
    color: var(--sf-neutral-600);
    line-height: var(--sf-leading-normal);
}

.sf-error-text,
.sf-form-error,
.form-error {
    display: block;
    margin-top: var(--sf-space-2);
    font-size: var(--sf-text-sm);
    color: var(--sf-error-600);
    line-height: var(--sf-leading-normal);
}

/* ============================================
   LOADING STATE
   ============================================ */

/**
 * Loading Spinner in Modal
 */
.sf-modal-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.95);
    z-index: 1;
    gap: var(--sf-space-4);
}

.sf-modal-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--sf-neutral-200);
    border-top-color: var(--sf-primary-600);
    border-radius: var(--sf-radius-full);
    animation: sf-modal-spin 0.8s linear infinite;
}

@keyframes sf-modal-spin {
    to { transform: rotate(360deg); }
}

.sf-modal-loading-text {
    font-size: var(--sf-text-base);
    color: var(--sf-neutral-600);
    margin: 0;
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/**
 * Focus Management
 * Ensures keyboard navigation works properly
 */
.sf-modal-backdrop:focus {
    outline: none;
}

/* Focus trap - prevents tabbing outside modal */
.sf-modal-content:focus {
    outline: none;
}

/* Skip to main content when modal is open */
.sf-modal-backdrop[aria-hidden="true"] {
    display: none;
}

/* Screen reader announcements */
.sf-modal-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (max-width: 1024px) */
@media screen and (max-width: 1024px) {
    .sf-modal-content.modal-xl {
        max-width: 90vw;
    }
    
    .sf-modal-content.modal-lg {
        max-width: 85vw;
    }
}

/* Mobile (max-width: 768px) */
@media screen and (max-width: 768px) {
    .sf-modal-backdrop {
        padding: var(--sf-space-3);
    }
    
    .sf-modal-content {
        max-width: 95vw;
        max-height: 95vh;
    }
    
    .sf-modal-content.modal-sm,
    .sf-modal-content.modal-md,
    .sf-modal-content.modal-lg,
    .sf-modal-content.modal-xl {
        max-width: 95vw;
    }
    
    .sf-modal-header,
    .sf-modal__header {
        padding: var(--sf-space-4) var(--sf-space-5);
    }
    
    .sf-modal-title,
    .sf-modal__title {
        font-size: var(--sf-text-lg);
    }
    
    .sf-modal-body,
    .sf-modal__body {
        padding: var(--sf-space-4);
    }
    
    .sf-modal-footer,
    .sf-modal__footer {
        padding: var(--sf-space-4) var(--sf-space-5);
        flex-wrap: wrap;
    }
    
    .sf-modal-footer .btn,
    .sf-modal-footer .sf-btn,
    .sf-modal__footer .btn,
    .sf-modal__footer .sf-btn {
        flex: 1;
        min-width: 0;
    }
    
    /* Stack form rows on mobile */
    .sf-modal-form-row,
    .sf-modal-form-row-3 {
        grid-template-columns: 1fr;
        gap: var(--sf-space-5);
    }
    
    .sf-modal-advanced-options {
        padding: var(--sf-space-4);
    }
    
    /* Ensure labels stay on top on mobile */
    .sf-field,
    .sf-modal-field {
        flex-direction: column;
    }
    
    /* Maintain textarea height on mobile */
    .sf-textarea,
    .sf-modal-textarea {
        min-height: 80px;
    }
}

/* Small Mobile (max-width: 480px) */
@media screen and (max-width: 480px) {
    .sf-modal-backdrop {
        padding: 0;
    }
    
    .sf-modal-content {
        max-width: 100vw;
        max-height: 100vh;
        border-radius: 0;
        margin: 0;
    }
    
    .sf-modal-header,
    .sf-modal__header {
        padding: var(--sf-space-3) var(--sf-space-4);
    }
    
    .sf-modal-body,
    .sf-modal__body {
        padding: var(--sf-space-3);
    }
    
    .sf-modal-footer,
    .sf-modal__footer {
        padding: var(--sf-space-3) var(--sf-space-4);
    }
    
    .sf-modal-form-stack {
        gap: var(--sf-space-4);
    }
    
    .sf-modal-advanced-options {
        padding: var(--sf-space-3);
    }
    
    /* Confirmation dialog adjustments */
    .sf-modal-confirm-icon {
        width: 56px;
        height: 56px;
        font-size: var(--sf-text-2xl);
    }
}

/* ============================================
   DARK MODE SUPPORT
   ============================================ */

@media (prefers-color-scheme: dark) {
    [data-theme="dark"] .sf-modal-content,
    [data-theme="dark"] .sf-modal-header,
    [data-theme="dark"] .sf-modal__header,
    [data-theme="dark"] .sf-modal-body,
    [data-theme="dark"] .sf-modal__body,
    [data-theme="dark"] .sf-modal-footer,
    [data-theme="dark"] .sf-modal__footer {
        background-color: var(--sf-neutral-800);
        border-color: var(--sf-neutral-700);
    }
    
    [data-theme="dark"] .sf-modal-title,
    [data-theme="dark"] .sf-modal__title {
        color: var(--sf-neutral-100);
    }
    
    [data-theme="dark"] .sf-modal-close,
    [data-theme="dark"] .sf-modal__close {
        color: var(--sf-neutral-400);
    }
    
    [data-theme="dark"] .sf-modal-close:hover,
    [data-theme="dark"] .sf-modal__close:hover {
        background-color: var(--sf-neutral-700);
        color: var(--sf-neutral-100);
    }
    
    [data-theme="dark"] .sf-modal-advanced-options {
        background-color: var(--sf-neutral-900);
        border-color: var(--sf-neutral-700);
    }
    
    [data-theme="dark"] .sf-modal-loading {
        background-color: rgba(31, 41, 55, 0.95);
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .sf-modal-backdrop {
        position: static;
        background: none;
        padding: 0;
    }
    
    .sf-modal-content {
        max-width: 100%;
        max-height: none;
        box-shadow: none;
        border: 1px solid var(--sf-neutral-300);
    }
    
    .sf-modal-close,
    .sf-modal__close {
        display: none;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Prevent body scroll when modal is open */
body.modal-open {
    overflow: hidden;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .sf-modal-content {
        border: 2px solid currentColor;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .sf-modal-backdrop,
    .sf-modal-content {
        animation: none;
    }
    
    .sf-modal-backdrop[data-open="true"],
    .sf-modal-backdrop.is-open {
        animation: none;
    }
}