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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.95;
}

/* Form Styles */
form {
    padding: 30px;
}

.form-section {
    margin-bottom: 40px;
}

.form-section h2 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #667eea;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
    font-size: 1rem;
}

.required {
    color: #e74c3c;
    font-weight: bold;
}

/* Input Styles */
input[type="text"],
input[type="password"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #667eea;
}

select {
    cursor: pointer;
    background-color: white;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Rating Scale Styles */
.rating-container {
    margin-top: 15px;
}

.rating-scale {
    display: flex;
    gap: 15px;
    justify-content: space-between;
    margin-bottom: 10px;
}

.rating-option {
    flex: 1;
    text-align: center;
}

.rating-option input[type="radio"] {
    display: none;
}

.rating-option label {
    display: block;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    background: white;
}

.rating-option label:hover {
    border-color: #667eea;
    background: #f8f9ff;
    transform: translateY(-2px);
}

.rating-option input[type="radio"]:checked + label {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
    transform: scale(1.05);
}

.rating-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: #666;
    font-style: italic;
    padding: 0 5px;
}

/* Radio Group Styles */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 15px;
}

.radio-option {
    display: flex;
    align-items: center;
}

.radio-option input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: 12px;
    cursor: pointer;
    accent-color: #667eea;
}

.radio-option label {
    cursor: pointer;
    margin: 0;
    padding: 12px 20px;
    flex: 1;
    border: 2px solid #ddd;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.radio-option:hover label {
    border-color: #667eea;
    background: #f8f9ff;
}

.radio-option input[type="radio"]:checked + label {
    border-color: #667eea;
    background: #f8f9ff;
    font-weight: 600;
    color: #667eea;
}

/* Character Counter */
.char-counter {
    text-align: right;
    font-size: 0.875rem;
    color: #666;
    margin-top: 5px;
}

/* Error Message Styles */
.error-message {
    display: block;
    color: #e74c3c;
    font-size: 0.875rem;
    margin-top: 5px;
    min-height: 20px;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: #e74c3c;
}

/* Button Styles */
.form-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.btn {
    padding: 14px 30px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: white;
    color: #666;
    border: 2px solid #ddd;
}

.btn-secondary:hover {
    border-color: #999;
    color: #333;
}

.btn-danger {
    background: #dc3545;
    color: white;
    border: 2px solid #dc3545;
}

.btn-danger:hover {
    background: #c82333;
    border-color: #bd2130;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(220, 53, 69, 0.4);
}

/* Success Message Styles */
.success-message {
    padding: 60px 30px;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.success-message.hidden {
    display: none;
}

.success-content {
    max-width: 500px;
    margin: 0 auto;
}

.success-icon {
    width: 80px;
    height: 80px;
    color: #2ecc71;
    margin-bottom: 20px;
    animation: scaleIn 0.5s ease;
}

.success-message h3 {
    font-size: 1.75rem;
    color: #333;
    margin-bottom: 10px;
}

.success-message p {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 30px;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0);
    }
    to {
        transform: scale(1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header {
        padding: 30px 20px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    form {
        padding: 20px;
    }

    .form-section h2 {
        font-size: 1.25rem;
    }

    .rating-scale {
        gap: 8px;
    }

    .rating-option label {
        padding: 12px 8px;
        font-size: 1rem;
    }

    .rating-labels {
        font-size: 0.75rem;
    }

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

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .rating-scale {
        gap: 5px;
    }

    .rating-option label {
        padding: 10px 5px;
        font-size: 0.9rem;
    }

    .rating-labels span:first-child::after {
        content: " →";
    }

    .rating-labels span:last-child::before {
        content: "← ";
    }
}

/* Loading State Styles */
.loading-state {
    padding: 60px 30px;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-state p {
    color: #666;
    font-size: 1.1rem;
}

/* Error State Styles */
.error-state {
    padding: 60px 30px;
    text-align: center;
}

.error-icon {
    width: 80px;
    height: 80px;
    color: #e74c3c;
    margin: 0 auto 20px;
}

.error-state h3 {
    font-size: 1.75rem;
    color: #333;
    margin-bottom: 10px;
}

.error-state p {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.error-help {
    color: #999;
    font-size: 0.9rem;
    font-style: italic;
}

.error-details {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 6px;
    padding: 10px 15px;
    margin: 15px auto;
    max-width: 600px;
    color: #856404;
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
}

/* Manual Entry Section Styles */
.manual-entry-section {
    margin: 30px auto;
    padding: 30px;
    background: #f8f9ff;
    border: 2px solid #e0e5ff;
    border-radius: 10px;
    max-width: 500px;
}

.manual-entry-prompt {
    font-size: 1rem;
    color: #333;
    font-weight: 600;
    margin-bottom: 15px;
}

.manual-entry-form {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.manual-entry-form input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    letter-spacing: 1px;
    transition: border-color 0.3s ease;
}

.manual-entry-form input:focus {
    outline: none;
    border-color: #667eea;
}

.manual-entry-form .btn {
    padding: 12px 24px;
    white-space: nowrap;
}

.manual-entry-error {
    color: #e74c3c;
    font-size: 0.875rem;
    padding: 10px;
    background: #ffe6e6;
    border-radius: 6px;
    border: 1px solid #e74c3c;
    margin-top: 10px;
}

.manual-entry-error.hidden {
    display: none;
}

/* Info Display Styles */
.info-display {
    background: #f8f9ff;
    border: 2px solid #e0e5ff;
    border-radius: 8px;
    padding: 20px;
}

.info-row {
    display: flex;
    padding: 10px 0;
    border-bottom: 1px solid #e0e5ff;
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: #667eea;
    min-width: 120px;
}

.info-value {
    color: #333;
    flex: 1;
}

/* Button Spinner */
.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}

/* Hidden Class */
.hidden {
    display: none !important;
}

/* Notification Styles */
.error-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    max-width: 400px;
    z-index: 100000;
    animation: slideIn 0.3s ease-out;
    border-left: 4px solid #e74c3c;
    cursor: pointer;
    pointer-events: auto;
}

.error-notification.success {
    border-left-color: #27ae60;
}

.error-notification.info {
    border-left-color: #3498db;
}

.error-notification.warning {
    border-left-color: #f39c12;
}

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

.error-content {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.error-content strong {
    font-size: 1.1rem;
    color: #2c3e50;
}

.error-content p {
    color: #666;
    margin: 0;
}

.notification-close {
    align-self: flex-end;
    background: #ecf0f1;
    border: none;
    padding: 8px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: #2c3e50;
    transition: background-color 0.2s ease;
    pointer-events: auto;
    position: relative;
    z-index: 1;
}

.notification-close:hover {
    background: #bdc3c7;
}

/* Loading Skeleton */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 16px;
    margin: 10px 0;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin: 10px 0;
}

/* Accessibility improvements */
[role="alert"],
[aria-live="assertive"] {
    font-weight: 600;
}

/* Focus visible */
:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Screen reader only */
.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;
}

/* ==========================================================================
   Session finder
   --------------------------------------------------------------------------
   Shown only when someone opens the feedback link without scanning a QR code,
   so it is the recovery path rather than the main one. It searches instead of
   listing: an event has hundreds of sessions, and enumerating them is exactly
   what the old dropdown did wrong.

   It sits outside the form on purpose -- nested inside, hiding the form hid
   this too, and Enter triggered a native form GET that dropped the query
   string.
   ========================================================================== */

#sessionFinder {
    padding: 30px 40px 40px;
}

#sessionFinder > label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
    font-size: 1rem;
}

#sessionFinder input[type="search"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

#sessionFinder input[type="search"]:focus {
    outline: none;
    border-color: #667eea;
}

#sessionFinderResults {
    list-style: none;
    margin: 16px 0 0;
    padding: 0;
    border: 1px solid #e0e5ff;
    border-radius: 6px;
    overflow: hidden;
}

/* Empty until someone types, so collapse it rather than showing an empty box. */
#sessionFinderResults:empty {
    display: none;
}

#sessionFinderResults li + li {
    border-top: 1px solid #e0e5ff;
}

#sessionFinderResults a {
    display: block;
    padding: 14px 16px;
    color: #333;
    text-decoration: none;
    line-height: 1.4;
    transition: background-color 0.2s ease;
}

#sessionFinderResults a:hover,
#sessionFinderResults a:focus-visible {
    background: #f8f9ff;
    color: #667eea;
}

#sessionFinderResults a:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: -2px;
}

/* Guidance and empty results, not errors -- keep them quiet. */
#sessionFinderResults .hint {
    padding: 14px 16px;
    color: #666;
    font-size: 0.9375rem;
}

@media (max-width: 600px) {
    #sessionFinder {
        padding: 24px 20px 32px;
    }
}

@media (prefers-reduced-motion: reduce) {
    #sessionFinder input[type="search"],
    #sessionFinderResults a {
        transition: none;
    }
}