/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.2s ease;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
    background: var(--background-color);
    padding: 0.25rem;
    border-radius: var(--radius-lg);
}

.nav-tab {
    padding: 0.5rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-tab:hover {
    color: var(--text-primary);
    background: var(--surface-color);
}

.nav-tab.active {
    background: var(--surface-color);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

/* Builder Layout */
.builder-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.5rem;
}

/* Panel */
.panel {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.panel h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.panel h3 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin: 1.25rem 0 0.75rem;
    color: var(--text-primary);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.panel-header h2 {
    margin-bottom: 0;
}

/* Form Elements */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--text-primary);
    background: var(--surface-color);
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

textarea {
    min-height: 80px;
    resize: vertical;
}

input[type="color"] {
    width: 50px;
    height: 36px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--background-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--background-color);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: var(--radius-sm);
}

/* Categories & Traits Sections */
.categories-section,
.traits-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.category-item,
.trait-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
}

.category-color,
.trait-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.category-info,
.trait-info {
    flex: 1;
    min-width: 0;
}

.category-name,
.trait-name {
    font-weight: 500;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.category-actions,
.trait-actions {
    display: flex;
    gap: 0.25rem;
}

/* Questions List */
.questions-list {
    min-height: 200px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
    text-align: center;
}

.empty-state svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9375rem;
}

/* Question Card */
.question-card {
    background: var(--background-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.question-card:hover {
    border-color: var(--primary-color);
}

.question-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.question-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50%;
    flex-shrink: 0;
}

.question-text {
    flex: 1;
    font-weight: 500;
    font-size: 0.9375rem;
    line-height: 1.4;
}

.question-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.question-type-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
}

.question-options {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.question-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.question-option::before {
    content: "•";
    color: var(--primary-color);
}

/* Action Bar */
.action-bar {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--background-color);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-body h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin: 1.25rem 0 0.75rem;
    color: var(--text-primary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--background-color);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* Answer Options */
.answer-option-item {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    align-items: flex-start;
}

.answer-option-item input[type="text"] {
    flex: 1;
}

.answer-option-item select {
    width: 140px;
    flex-shrink: 0;
}

.answer-option-item input[type="number"] {
    width: 70px;
    flex-shrink: 0;
}

/* Likert & Slider Settings */
.likert-labels,
.slider-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Preview Tab */
.preview-container {
    max-width: 700px;
    margin: 0 auto;
}

.test-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.test-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.test-header p {
    color: var(--text-secondary);
}

.preview-questions {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-question {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.preview-question-text {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.preview-question-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: 50%;
    margin-right: 0.75rem;
}

/* Answer Types */
.answer-choices {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.answer-choice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.answer-choice:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.answer-choice.selected {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.answer-choice input {
    display: none;
}

.answer-choice-radio {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.answer-choice.selected .answer-choice-radio {
    border-color: var(--primary-color);
}

.answer-choice.selected .answer-choice-radio::after {
    content: "";
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
}

.answer-choice-text {
    font-size: 0.9375rem;
}

/* Likert Scale */
.likert-scale {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.likert-labels-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.likert-options {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
}

.likert-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    padding: 0.75rem 0.5rem;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.likert-option:hover {
    border-color: var(--primary-color);
}

.likert-option.selected {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.likert-option input {
    display: none;
}

.likert-value {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
}

/* Slider */
.slider-container {
    padding: 0.5rem 0;
}

.slider-labels-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.slider-input {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.slider-input::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

.slider-value {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: 0.75rem;
}

/* Yes/No */
.yes-no-options {
    display: flex;
    gap: 1rem;
}

.yes-no-option {
    flex: 1;
    padding: 1rem;
    text-align: center;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.yes-no-option:hover {
    border-color: var(--primary-color);
}

.yes-no-option.selected {
    border-color: var(--primary-color);
    background: var(--primary-light);
    color: var(--primary-color);
}

.yes-no-option input {
    display: none;
}

/* Preview Actions */
.preview-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Results Tab */
.results-container {
    max-width: 700px;
    margin: 0 auto;
}

.no-results {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    text-align: center;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.no-results svg {
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.results-content {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.results-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
}

/* Categorical Result */
.categorical-result {
    text-align: center;
    padding: 2rem;
    background: var(--background-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

.result-category-name {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.result-category-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Numerical Result */
.numerical-result {
    padding: 2rem;
    background: var(--background-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

.score-display {
    text-align: center;
    margin-bottom: 1.5rem;
}

.score-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.score-label {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.score-bar {
    height: 12px;
    background: var(--border-color);
    border-radius: 6px;
    overflow: hidden;
}

.score-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    border-radius: 6px;
    transition: width 0.5s ease;
}

/* Multi-Trait Result */
.trait-results {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.trait-result {
    padding: 1.25rem;
    background: var(--background-color);
    border-radius: var(--radius-md);
}

.trait-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.trait-result-name {
    font-weight: 600;
    font-size: 1rem;
}

.trait-result-score {
    font-weight: 600;
    color: var(--primary-color);
}

.trait-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.trait-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.trait-result-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Results Actions */
.results-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Share Modal */
.share-link-container {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
}

.share-link-container input {
    flex: 1;
    background: var(--background-color);
}

.share-note {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: white;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 2000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Footer */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    margin-top: auto;
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .builder-layout {
        grid-template-columns: 300px 1fr;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }

    .logo {
        justify-content: center;
    }

    .nav-tabs {
        justify-content: center;
    }

    .builder-layout {
        grid-template-columns: 1fr;
    }

    .test-settings {
        order: -1;
    }

    .action-bar {
        justify-content: center;
    }

    .answer-option-item {
        flex-wrap: wrap;
    }

    .answer-option-item select,
    .answer-option-item input[type="number"] {
        width: 100%;
    }

    .likert-labels,
    .slider-settings {
        grid-template-columns: 1fr;
    }

    .likert-options {
        flex-wrap: wrap;
    }

    .likert-option {
        min-width: calc(20% - 0.5rem);
    }

    .yes-no-options {
        flex-direction: column;
    }

    .modal-content {
        max-height: 85vh;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem;
    }

    .panel {
        padding: 1rem;
    }

    .nav-tab {
        padding: 0.5rem 0.875rem;
        font-size: 0.8125rem;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
    }

    .preview-question {
        padding: 1rem;
    }

    .results-content {
        padding: 1.5rem;
    }

    .action-bar {
        flex-direction: column;
    }

    .action-bar .btn {
        width: 100%;
    }
}

/* Drag and Drop */
.question-card.dragging {
    opacity: 0.5;
}

.question-card.drag-over {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

/* Hidden File Input */
.hidden-input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}