/**
 * Activity Submission System - Sticky Panel Styles
 * Version: 1.0.0
 * Date: October 13, 2025
 */

/* =============================================================================
   STICKY SUBMISSION PANEL
   ============================================================================= */

.activity-submission-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-top: 3px solid #2c3e50;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: transform 0.3s ease-in-out;
}

.activity-submission-panel.expanded {
    max-height: 85vh;
    overflow-y: auto;
}

/* Panel Toggle Button */
.panel-toggle {
    width: 100%;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: #ffffff;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background 0.3s ease;
}

.panel-toggle:hover {
    background: linear-gradient(135deg, #2980b9 0%, #21618c 100%);
}

.panel-toggle:focus {
    outline: 2px solid #f39c12;
    outline-offset: -2px;
}

.toggle-arrow {
    font-size: 0.9em;
    transition: transform 0.3s ease;
}

/* Panel Content */
.panel-content {
    padding: 2rem;
    background: #f8f9fa;
    border-top: 1px solid #dee2e6;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =============================================================================
   FORM SECTIONS
   ============================================================================= */

.form-section {
    background: #ffffff;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.form-section h3 {
    margin: 0 0 1rem 0;
    font-size: 1.2rem;
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

.form-section h4 {
    margin: 1rem 0 0.5rem 0;
    font-size: 1rem;
    color: #34495e;
}

/* Form Grid Layout */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

/* =============================================================================
   FORM ELEMENTS
   ============================================================================= */

label {
    font-weight: 600;
    color: #2c3e50;
    font-size: 0.95rem;
}

label .required {
    color: #e74c3c;
    margin-left: 0.25rem;
}

label .helper-text {
    font-weight: 400;
    color: #7f8c8d;
    font-size: 0.85rem;
    display: block;
    margin-top: 0.25rem;
}

input[type="text"],
input[type="email"],
input[type="number"],
select,
textarea {
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

input[type="text"]:invalid,
input[type="email"]:invalid {
    border-color: #e74c3c;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

select {
    cursor: pointer;
    background-color: #ffffff;
}

/* Checkboxes and Radio Buttons */
input[type="checkbox"],
input[type="radio"] {
    width: 1.2rem;
    height: 1.2rem;
    cursor: pointer;
    margin-right: 0.5rem;
}

.checkbox-group,
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-item,
.radio-item {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.checkbox-item:hover,
.radio-item:hover {
    background-color: #f0f0f0;
}

.checkbox-item label,
.radio-item label {
    cursor: pointer;
    margin: 0;
    flex: 1;
}

/* =============================================================================
   BUTTONS
   ============================================================================= */

.form-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid #dee2e6;
}

.form-actions .help-text {
    margin: 0;
    text-align: center;
    color: #6c757d;
    font-size: 0.95rem;
}

button[type="submit"],
.btn-primary {
    padding: 0.875rem 2rem;
    background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(39, 174, 96, 0.3);
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.btn-primary.btn-lg {
    padding: 1.125rem 2.5rem;
    font-size: 1.15rem;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
}

button[type="submit"]:hover,
.btn-primary:hover {
    background: linear-gradient(135deg, #229954 0%, #1e8449 100%);
    box-shadow: 0 6px 16px rgba(39, 174, 96, 0.4);
    transform: translateY(-2px);
}

button[type="submit"]:active,
.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

button[type="submit"]:disabled,
.btn-primary:disabled {
    background: #95a5a6;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

.btn-secondary {
    padding: 0.875rem 2rem;
    background: #ecf0f1;
    color: #2c3e50;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: #bdc3c7;
    border-color: #95a5a6;
}

/* =============================================================================
   STATUS MESSAGES
   ============================================================================= */

.submission-status {
    padding: 1.25rem 1.5rem;
    border-radius: 8px;
    margin: 1rem auto 0;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    max-width: 500px;
    text-align: center;
    animation: slideDown 0.3s ease-out;
}

.submission-status::before {
    content: '';
    display: inline-block;
    width: 1.2rem;
    height: 1.2rem;
    background-size: contain;
}

.submission-status.success {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.submission-status.success::before {
    content: '✓';
    font-weight: bold;
    font-size: 1.5rem;
}

.submission-status.error {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.submission-status.error::before {
    content: '✗';
    font-weight: bold;
    font-size: 1.5rem;
}

.submission-status.info {
    background-color: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

.submission-status.info::before {
    content: 'ℹ';
    font-weight: bold;
    font-size: 1.5rem;
}

/* =============================================================================
   AUTO-SAVE INDICATOR
   ============================================================================= */

.auto-save-indicator {
    position: fixed;
    bottom: 80px;
    right: 2rem;
    background: rgba(46, 204, 113, 0.95);
    color: #ffffff;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: slideInRight 0.3s ease-out, fadeOut 0.3s ease-out 1.7s forwards;
    z-index: 999;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
    }
}

.auto-save-indicator::before {
    content: '💾';
    font-size: 1.2em;
}

/* =============================================================================
   SPINNER
   ============================================================================= */

.submit-spinner {
    display: inline-block;
    width: 1.2rem;
    height: 1.2rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

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

@media (max-width: 768px) {
    .panel-content {
        padding: 1.5rem 1rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
    }

    button[type="submit"],
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .auto-save-indicator {
        right: 1rem;
        bottom: 70px;
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .activity-submission-panel.expanded {
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    .panel-toggle {
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }

    .form-section {
        padding: 1rem;
    }

    .form-section h3 {
        font-size: 1.1rem;
    }

    input[type="text"],
    input[type="email"],
    input[type="number"],
    select,
    textarea {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

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

@media print {
    .activity-submission-panel {
        display: none;
    }
}

/* =============================================================================
   PROBLEM SET DISPLAY
   ============================================================================= */

.problem-set-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.ps-introduction,
.ps-formulae,
.ps-standards {
    background: #f8f9fa;
    border-left: 4px solid #3498db;
    padding: 0;
    margin-bottom: 1rem;
    border-radius: 4px;
}

/* Collapsible Section Styling */
.collapsible-section summary {
    cursor: pointer;
    padding: 1rem 1.5rem;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: #2c3e50;
    transition: background-color 0.2s ease;
}

.collapsible-section summary:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

.collapsible-section summary::-webkit-details-marker {
    display: none;
}

.collapsible-section .toggle-icon {
    display: inline-block;
    transition: transform 0.2s ease;
    font-size: 0.8em;
    color: #3498db;
}

.collapsible-section[open] .toggle-icon {
    transform: rotate(90deg);
}

.collapsible-section .section-content {
    padding: 0 1.5rem 1.5rem 1.5rem;
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ps-formulae ul,
.ps-standards ul {
    margin: 0.5rem 0 0 0;
    padding-left: 1.5rem;
}

.ps-formulae li,
.ps-standards li {
    margin-bottom: 0.5rem;
}

/* Sequential Problem Display */
.ps-problems {
    position: relative;
    min-height: 400px;
}

.problem-section-header {
    color: #2c3e50;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
    margin: 0 0 1.5rem 0;
    font-size: 1.8rem;
}

.problem-container {
    background: #ffffff;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    display: none; /* Hidden by default */
}

.problem-container.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.problem-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #dee2e6;
}

.problem-number {
    font-size: 1.1rem;
    font-weight: 700;
    color: #2c3e50;
}

.problem-tier {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.problem-tier.tier-1 {
    background: #d4edda;
    color: #155724;
}

.problem-tier.tier-2 {
    background: #fff3cd;
    color: #856404;
}

.problem-tier.tier-3 {
    background: #f8d7da;
    color: #721c24;
}

.problem-statement {
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.problem-statement table {
    margin: 1rem 0;
    border-collapse: collapse;
    width: 100%;
}

.problem-statement th,
.problem-statement td {
    border: 1px solid #dee2e6;
    padding: 0.5rem;
    text-align: left;
}

.problem-statement th {
    background: #f8f9fa;
    font-weight: 600;
}

/* =============================================================================
   PROBLEM ANSWER SECTION - Academic Style (Updated October 2025)
   ============================================================================= */

.problem-answer {
    margin-top: 0;
    padding: 1.25rem;
    background: #f8f9fa;
    border-left: 3px solid #495057;
    border-top: none;
    border-radius: 2px;
}

.problem-answer label {
    font-weight: 500;
    color: #212529;
    font-size: 0.95rem;
    display: block;
    margin-bottom: 0.4rem;
}

.problem-answer-field {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid #adb5bd;
    background: white;
    border-radius: 2px;
    font-size: 0.95rem;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 0.2s ease;
}

.problem-answer-field:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.1);
}

.problem-answer-field::placeholder {
    color: #95a5a6;
    font-style: italic;
}

/* Multi-part Answer Fields */
.answer-part {
    margin-bottom: 1rem;
}

.answer-part label {
    font-weight: 500;
    color: #212529;
    font-size: 0.95rem;
    display: block;
    margin-bottom: 0.4rem;
}

/* Numeric Input with Units */
.answer-part input[type="text"] {
    width: 120px;
    padding: 0.25rem 0.5rem;
    border: 1px solid #adb5bd;
    background: white;
    border-radius: 2px;
    font-size: 0.95rem;
    line-height: 1.2;
    font-family: 'Courier New', monospace;
}

.answer-part select {
    width: 80px;
    padding: 0.25rem 0.5rem;
    border: 1px solid #adb5bd;
    background: white;
    border-radius: 2px;
    font-size: 0.95rem;
    line-height: 1.2;
}

/* Multiple Choice Dropdowns */
.answer-part select[id*="answer-"] {
    width: 100%;
    max-width: 400px;
    padding: 0.4rem 0.5rem;
}

/* Essay Text Areas */
.answer-part textarea[rows="8"] {
    font-family: Georgia, serif;
    line-height: 1.6;
}

/* Specific input type classes for Academic Design v2.0 */
.numeric-input {
    font-family: 'Courier New', monospace;
    width: 120px;
}

.unit-dropdown {
    width: 80px;
}

.choice-select {
    width: 100%;
    max-width: 400px;
}

.essay-input {
    font-family: Georgia, serif;
    line-height: 1.6;
}

.text-input {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* =============================================================================
   UNIFIED NAVIGATION CONTAINER - Academic Design v2.0
   ============================================================================= */

.unified-navigation-container {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 2px;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.navigation-controls-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 0.75rem;
}

.problem-dropdown-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: #495057;
    margin: 0;
}

.problem-selector {
    padding: 0.4rem 0.75rem;
    border: 1px solid #adb5bd;
    background: white;
    border-radius: 2px;
    font-size: 0.85rem;
    color: #212529;
    min-width: 200px;
    cursor: pointer;
}

.problem-selector:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.1);
}

/* =============================================================================
   PROBLEM NAVIGATION - Academic Style (Updated October 2025)
   ============================================================================= */

.activity-nav-button {
    padding: 0.4rem 0.9rem;
    border: 1px solid #495057;
    background: white;
    color: #212529;
    border-radius: 2px;
    font-size: 0.85rem;
    font-weight: normal;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.15s;
}

.activity-nav-button:hover:not(:disabled) {
    background: #f8f9fa;
    border-color: #212529;
}

.activity-nav-button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.nav-text {
    font-size: 0.85rem;
}

.nav-icon {
    font-size: 0.9em;
}

/* =============================================================================
   SOLUTION DISPLAY - Academic Style
   ============================================================================= */

.current-answer-display {
    background: #e7f3ff;
    border: 1px solid #b3d9ff;
    border-radius: 2px;
    padding: 1rem;
    margin: 1rem 0;
    display: none; /* Hidden by default, shown by JavaScript */
}

.current-answer-display strong {
    color: #004085;
    font-weight: 600;
}

.current-answer-display > div {
    margin-top: 0.5rem;
}

.current-answer-display > div > div {
    margin-bottom: 0.5rem;
}

/* View Solution Button */
.check-answer-button {
    padding: 0.4rem 1rem;
    border: 1px solid #0056b3;
    background: #007bff;
    color: white;
    border-radius: 2px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.check-answer-button:hover {
    background: #0056b3;
    transform: none;
}

/* Solution Display */
.current-answer-display {
    display: none;
    margin-bottom: 1rem;
    padding: 1rem 1.25rem;
    background: #f1f3f5;
    border: 1px solid #adb5bd;
    border-radius: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.current-answer-display strong:first-child {
    color: #495057;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.current-answer-display > div {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: #212529;
}

.current-answer-display > div > div {
    margin-bottom: 0.5rem;
}

.current-answer-display > div > div > strong {
    font-weight: 600;
}

.problem-progress {
    text-align: center;
    font-weight: 600;
    color: #2c3e50;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.problem-navigation-dropdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.problem-selector {
    padding: 0.5rem 2.5rem 0.5rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    border: 2px solid #3498db;
    border-radius: 6px;
    background-color: white;
    color: #2c3e50;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%233498db' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 12px;
}

.problem-selector:hover {
    background-color: #f8f9fa;
    border-color: #2980b9;
}

.problem-selector:focus {
    outline: none;
    border-color: #2980b9;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.problem-count {
    font-size: 1rem;
    color: #7f8c8d;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.problem-progress-bar {
    width: 100%;
    height: 8px;
    background: #ecf0f1;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.problem-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3498db 0%, #2ecc71 100%);
    transition: width 0.3s ease;
    border-radius: 4px;
}

/* Reflection Section Styling */
.reflection-section {
    margin-top: 3rem;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 8px;
    border: 2px solid #3498db;
}

.reflection-section h2 {
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
}

/* =============================================================================
   UNIFIED NAVIGATION SYSTEM (All Activity Types)
   ============================================================================= */

/* Generic navigation container (used by all activity types) */
.nav-item-container {
    background: #ffffff;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    display: none; /* Hidden by default */
    max-width: 100%;
    overflow-wrap: break-word;
    box-sizing: border-box;
}

.nav-item-container.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

/* Unified navigation buttons (used by flexbooks, hexagon labs, etc.) */
.activity-navigation {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1001; /* Must be higher than submission-bar's z-index (1000) */
}

/* Old colorful navigation button styles removed - see Academic Design v2.0 styles above (line ~885) */

/* =============================================================================
   Activity Page Header & Navigation
   ============================================================================= */

.site-header .nav-link:hover {
    background: rgba(255, 255, 255, 0.2) !important;
    transform: translateY(-1px);
}

.quick-navigation-wrapper details[open] summary span:last-child {
    transform: rotate(180deg);
}

.quick-navigation-wrapper summary:hover {
    background: rgba(0, 0, 0, 0.02);
    border-radius: 0.25rem;
}

/* =============================================================================
   REFLECTION SECTION & SUBMISSION - Compact Academic Style
   ============================================================================= */

.reflection-section {
    margin-top: 2rem;
}

.reflection-section h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #212529;
    font-weight: 500;
    border-bottom: none;
    padding-bottom: 0;
}

.form-subsection {
    border: 1px solid #dee2e6;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 2px;
}

.form-subsection legend {
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0 0.5rem;
}

/* Override form-grid for compact academic style */
.reflection-section .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.reflection-section .form-field label {
    font-size: 0.85rem;
    display: block;
    margin-bottom: 0.3rem;
    font-weight: normal;
}

.reflection-section .form-field input,
.reflection-section .form-field select {
    width: 100%;
    padding: 0.4rem;
    border: 1px solid #ced4da;
    border-radius: 2px;
    font-size: 0.9rem;
}

.reflection-section .form-field input[readonly] {
    background: #e9ecef;
}

/* Auto-save Indicator - Compact */
#auto-save-indicator {
    position: fixed;
    top: 1rem;
    right: 1rem;
    padding: 0.4rem 0.75rem;
    background: #28a745;
    color: white;
    border-radius: 2px;
    font-size: 0.8rem;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 1000;
}

/* Submit Section - Compact */
.reflection-section .form-actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #dee2e6;
}

.reflection-section .form-actions button[type="submit"] {
    padding: 0.6rem 1.5rem;
    border: none;
    background: #007bff;
    color: white;
    border-radius: 2px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
}

.reflection-section .form-actions button[type="submit"]:hover {
    background: #0056b3;
}

.reflection-section .form-actions .help-text {
    margin-top: 0.5rem;
    text-align: center;
    color: #6c757d;
    font-size: 0.85rem;
}

/* =============================================================================
   FLOATING SUBMISSION BAR (Minimal, Clean)
   ============================================================================= */

.submission-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-top: 2px solid #495057;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 0.75rem 1.5rem;
}

.submission-bar-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.submission-field-inline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.submission-field-inline label {
    font-weight: 500;
    color: #495057;
    margin: 0;
    white-space: nowrap;
}

.submission-field-inline input {
    padding: 0.5rem 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    font-size: 0.95rem;
    min-width: 200px;
}

.submission-field-inline input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.btn-submit-inline {
    margin-left: auto;
    padding: 0.6rem 1.5rem;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 0.25rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-submit-inline:hover {
    background: #0056b3;
}

.btn-submit-inline:disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.submission-status-inline {
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.auto-save-indicator-inline {
    color: #28a745;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .submission-bar {
        padding: 0.5rem 1rem;
    }
    
    .submission-bar-content {
        flex-direction: column;
        gap: 0.75rem;
        align-items: stretch;
    }
    
    .submission-field-inline {
        flex-direction: column;
        align-items: stretch;
    }
    
    .submission-field-inline input {
        width: 100%;
        min-width: unset;
    }
    
    .btn-submit-inline {
        margin-left: 0;
        width: 100%;
    }
    
    /* Unified Navigation - Mobile */
    .navigation-controls-row {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .problem-dropdown-container {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }
    
    .problem-selector {
        width: 100%;
        min-width: unset;
    }
    
    .activity-navigation {
        width: 100%;
        display: flex;
        justify-content: space-between;
    }
    
    .activity-nav-button {
        flex: 1;
    }
}