/* CSS Variables */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --success-light: #d1fae5;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --danger-color: #ef4444;
    --danger-light: #fee2e2;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 2px 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);
    --transition: all 0.2s ease;
}

/* Reset & Base */
*, *::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, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    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;
    gap: 1rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius);
}

.title-group h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

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

/* Progress Ring */
.progress-summary {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.progress-ring {
    position: relative;
    width: 48px;
    height: 48px;
}

.progress-ring svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.progress-ring-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 3;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--success-color);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke-dasharray 0.5s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Config Panel */
.config-panel {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.config-panel h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.config-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.config-group > label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.config-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Form Elements */
select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    cursor: pointer;
    transition: var(--transition);
}

select:hover {
    border-color: var(--primary-color);
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Checkbox Group */
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
    user-select: none;
}

.checkbox-label:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.checkbox-label input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.checkbox-label input:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input:checked + .checkmark::after {
    content: '';
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg) translateY(-1px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

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

.btn-outline:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

.config-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Checklist Section */
.checklist-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.checklist-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.checklist-title-group h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

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

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    z-index: 50;
    display: none;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.875rem;
    color: var(--text-primary);
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
}

.dropdown-item:first-child {
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.filter-buttons {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-tertiary);
    padding: 0.25rem;
    border-radius: var(--border-radius);
}

.filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* Checklist Container */
.checklist-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Category */
.category {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.category-header:hover {
    background: var(--border-color);
}

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

.category-title h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.category-badge {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    background: var(--primary-light);
    color: var(--primary-color);
}

.category-toggle {
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.category.collapsed .category-toggle {
    transform: rotate(-90deg);
}

.category-content {
    padding: 0.5rem;
}

.category.collapsed .category-content {
    display: none;
}

/* Checklist Item */
.checklist-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.checklist-item:hover {
    background: var(--bg-secondary);
}

.checklist-item.completed {
    opacity: 0.7;
}

.checklist-item.completed .item-title {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.item-checkbox {
    flex-shrink: 0;
}

.item-checkbox input {
    display: none;
}

.item-checkbox label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.item-checkbox label:hover {
    border-color: var(--primary-color);
}

.item-checkbox input:checked + label {
    background: var(--success-color);
    border-color: var(--success-color);
}

.item-checkbox input:checked + label::after {
    content: '';
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg) translateY(-1px);
}

.item-content {
    flex: 1;
    min-width: 0;
}

.item-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.item-title {
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
}

.item-badges {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.level-badge {
    font-size: 0.625rem;
    font-weight: 600;
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.level-badge.level-a {
    background: var(--success-light);
    color: var(--success-color);
}

.level-badge.level-aa {
    background: var(--warning-light);
    color: var(--warning-color);
}

.level-badge.level-aaa {
    background: var(--danger-light);
    color: var(--danger-color);
}

.item-criterion {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.item-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: none;
}

.checklist-item.expanded .item-description {
    display: block;
}

.item-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.item-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.item-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.item-btn svg {
    width: 14px;
    height: 14px;
}

.item-btn.na-btn.active {
    background: var(--warning-light);
    color: var(--warning-color);
}

.checklist-item.na {
    opacity: 0.5;
}

.checklist-item.na .item-title {
    color: var(--text-muted);
}

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

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

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

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

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

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

.modal.show {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.modal-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-right: 2rem;
}

.modal-body {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.modal-body h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1rem 0 0.5rem;
}

.modal-body ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.modal-body li {
    margin-bottom: 0.5rem;
}

.modal-body code {
    background: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.8125rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .logo-section {
        flex-direction: column;
        align-items: flex-start;
    }

    .title-group h1 {
        font-size: 1.25rem;
    }

    .progress-summary {
        align-self: flex-end;
    }

    .main-content {
        padding: 1rem;
    }

    .config-panel {
        padding: 1.25rem;
    }

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

    .checklist-header {
        flex-direction: column;
    }

    .checklist-actions {
        width: 100%;
        justify-content: flex-start;
    }

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

    .filter-buttons {
        width: 100%;
        justify-content: center;
    }

    .checklist-item {
        flex-direction: column;
        gap: 0.75rem;
    }

    .item-checkbox {
        order: -1;
    }

    .item-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .item-badges {
        margin-top: 0.25rem;
    }

    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .checkbox-group {
        flex-direction: column;
    }

    .checkbox-label {
        width: 100%;
    }

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

    .config-actions .btn {
        width: 100%;
    }

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

    .checklist-actions .btn,
    .checklist-actions .dropdown {
        width: 100%;
    }

    .dropdown-menu {
        left: 0;
        right: 0;
    }

    .filter-buttons {
        flex-wrap: wrap;
    }

    .filter-btn {
        flex: 1;
        min-width: 70px;
        text-align: center;
    }
}

/* Print Styles */
@media print {
    .header,
    .config-panel,
    .checklist-actions,
    .filter-bar,
    .item-actions,
    .footer {
        display: none !important;
    }

    .checklist-section {
        box-shadow: none;
        padding: 0;
    }

    .category {
        break-inside: avoid;
        page-break-inside: avoid;
    }

    .checklist-item {
        break-inside: avoid;
        page-break-inside: avoid;
    }

    .category.collapsed .category-content {
        display: block !important;
    }

    .item-description {
        display: block !important;
    }
}

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

.checklist-item {
    animation: fadeIn 0.3s ease;
}

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