* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

h1 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.demo-section {
    margin-bottom: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.result-card {
    margin-bottom: 1.5rem;
}

.select-field,
.text-area {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    margin-top: 0.5rem;
}

.select-field:focus,
.text-area:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.text-area {
    resize: vertical;
    font-family: 'Courier New', monospace;
}

.description,
.help-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

.checkbox-group {
    display: grid;
    gap: 0.75rem;
    margin-top: 1rem;
}

.checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: background-color 0.2s;
}

.checkbox-item:hover {
    background-color: var(--bg-color);
}

.checkbox-item input[type="checkbox"] {
    margin-top: 0.25rem;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-label {
    flex: 1;
}

.checkbox-title {
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.checkbox-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.preferences-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.preference-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.action-bar {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.6;
}

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

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

.score-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.score-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.score-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.results-list {
    max-height: 500px;
    overflow-y: auto;
}

.assignment-item,
.collision-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.assignment-item:last-child,
.collision-item:last-child {
    border-bottom: none;
}

.collision-item {
    border-left: 4px solid var(--border-color);
    padding-left: 1rem;
}

.collision-item.critical {
    border-left-color: var(--danger-color);
}

.collision-item.high {
    border-left-color: var(--warning-color);
}

.collision-item.medium {
    border-left-color: var(--warning-color);
}

.collision-item.low {
    border-left-color: var(--secondary-color);
}

.collision-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.severity-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.severity-badge.critical {
    background: var(--danger-color);
    color: white;
}

.severity-badge.high {
    background: var(--warning-color);
    color: white;
}

.severity-badge.medium {
    background: var(--warning-color);
    color: var(--text-primary);
}

.severity-badge.low {
    background: var(--secondary-color);
    color: white;
}

.collision-description {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.collision-context {
    background: var(--bg-color);
    padding: 0.5rem;
    border-radius: 4px;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    border-left: 3px solid var(--primary-color);
}

.suggested-fixes {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-color);
    border-radius: 4px;
}

.suggested-fixes-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.fix-item {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    padding-left: 1rem;
    position: relative;
}

.fix-item::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.employee-name,
.shift-role {
    font-weight: 600;
}

/* Syntax Help */
.syntax-help {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.help-intro {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
}

.help-section-box {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.help-section-box h3 {
    font-size: 1.1rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.help-section-box h4 {
    font-size: 0.95rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.help-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.help-examples {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.example-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.example-item code {
    background: var(--bg-color);
    padding: 0.35rem 0.6rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border-color);
    flex: 1;
}

.example-note {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

.help-tip {
    background: #fffbeb;
    border-left: 3px solid var(--warning-color);
    padding: 0.75rem;
    margin-top: 0.75rem;
    font-size: 0.9rem;
    border-radius: 4px;
}

.help-dropdown {
    margin-top: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem;
}

.help-dropdown summary {
    cursor: pointer;
    font-weight: 600;
    padding: 0.25rem;
    color: var(--primary-color);
}

.help-dropdown summary:hover {
    background: var(--bg-color);
}

.help-dropdown .help-examples {
    margin-top: 0.75rem;
    padding-left: 0.5rem;
}

.policy-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.policy-list-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem;
    font-size: 0.9rem;
}

.policy-list-item strong {
    color: var(--primary-color);
}

.policy-list-item .description {
    margin-top: 0.25rem;
    font-size: 0.85rem;
}

/* DSL Preview */
.dsl-preview {
    background: #f0fdf4;
    border: 2px solid var(--success-color);
    border-radius: 6px;
    padding: 1rem;
    margin-top: 1rem;
}

.dsl-preview-title {
    font-weight: 700;
    color: var(--success-color);
    font-size: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dsl-preview-section {
    margin-bottom: 0.75rem;
}

.dsl-preview-section:last-child {
    margin-bottom: 0;
}

.dsl-preview-section-title {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.dsl-preview-items {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.dsl-preview-item {
    background: white;
    border-left: 3px solid var(--success-color);
    padding: 0.5rem;
    border-radius: 3px;
    font-size: 0.9rem;
}

/* Validation Errors */
.validation-errors {
    background: #fef2f2;
    border: 2px solid var(--danger-color);
    border-radius: 6px;
    padding: 1rem;
    margin-top: 1rem;
}

.validation-errors-title {
    font-weight: 700;
    color: var(--danger-color);
    font-size: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.validation-error-item {
    background: white;
    border-left: 4px solid var(--danger-color);
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

.validation-error-item:last-child {
    margin-bottom: 0;
}

.error-line {
    font-weight: 700;
    color: var(--danger-color);
    font-family: 'Courier New', monospace;
}

.error-text {
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    margin: 0.25rem 0;
    padding: 0.35rem;
    background: var(--bg-color);
    border-radius: 3px;
}

.error-reason {
    color: var(--text-primary);
    margin-top: 0.25rem;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.3s ease;
}

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

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

.modal-header h2 {
    margin: 0;
}

.modal-body {
    padding: 1.5rem;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

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

.btn-help {
    background: var(--success-color);
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-help:hover {
    background: #059669;
    box-shadow: var(--shadow-lg);
}

.btn-link {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0;
    font-size: 0.9rem;
    text-decoration: underline;
    margin-left: 0.5rem;
}

.btn-link:hover {
    color: var(--primary-dark);
}

/* Help Modal Styles */
.help-section {
    margin-bottom: 1.5rem;
}

.section-header {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.rule-examples {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.code-block {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.4;
}

/* Policy Details Modal */
.policy-rule-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.policy-rule-item {
    background: var(--bg-color);
    border-left: 4px solid var(--primary-color);
    padding: 0.75rem;
    border-radius: 4px;
}

.policy-rule-item.hard {
    border-left-color: var(--danger-color);
}

.policy-rule-item.soft {
    border-left-color: var(--success-color);
}

.policy-rule-type {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.policy-rule-type.hard {
    background: var(--danger-color);
    color: white;
}

.policy-rule-type.soft {
    background: var(--success-color);
    color: white;
}

.policy-rule-text {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* Calendar View Styles */
.view-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.btn-toggle {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-secondary);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-toggle:hover:not(.active) {
    background: var(--bg-color);
}

.calendar-view {
    display: none;
}

.calendar-view.active {
    display: block;
}

.list-view {
    display: block;
}

.list-view.hidden {
    display: none;
}

.calendar-grid {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.calendar-header {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem;
    font-weight: 600;
    text-align: center;
}

.calendar-time-label {
    background: var(--bg-color);
    padding: 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-day {
    background: var(--card-bg);
    padding: 0.5rem;
    min-height: 60px;
    position: relative;
}

.calendar-event {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
    cursor: pointer;
    transition: all 0.2s;
}

.calendar-event:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.calendar-employee-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.calendar-shift-info {
    font-size: 0.75rem;
    opacity: 0.9;
}

/* Header Layout */
header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.header-content {
    text-align: center;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

    h1 {
        font-size: 2rem;
    }

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

    .modal-content {
        width: 95%;
        max-height: 90vh;
    }

    .calendar-grid {
        grid-template-columns: 80px 1fr;
    }

    .calendar-event {
        font-size: 0.75rem;
        padding: 0.35rem;
    }
}