:root {
    --must-color: #c0392b;
    --must-bg: #fdedec;
    --must-border: #e74c3c;
    --should-color: #d4880f;
    --should-bg: #fef9e7;
    --should-border: #f1c40f;
    --may-color: #27ae60;
    --may-bg: #eafaf1;
    --may-border: #2ecc71;
    --check-color: #2ecc71;
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #dee2e6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --radius: 10px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.4;
    padding: 0;
}

.header {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    color: white;
    padding: 0.8rem 1.5rem;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.header h1 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.15rem;
}

.header p {
    font-size: 0.82rem;
    opacity: 0.85;
}

.progress-bar-container {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    height: 8px;
    margin-top: 0.5rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
}

.progress-bar {
    background: var(--check-color);
    height: 100%;
    border-radius: 20px;
    transition: width 0.4s ease;
    width: 0%;
}

.progress-text {
    font-size: 0.78rem;
    margin-top: 0.25rem;
    opacity: 0.9;
    font-weight: 600;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: center;
    padding: 0.5rem 1rem;
    background: white;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 99;
}

.toolbar button {
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: white;
    color: var(--text);
    font-size: 0.76rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-weight: 500;
}

.toolbar button:hover {
    background: #f0f0f0;
    border-color: #aaa;
}

.toolbar button.danger {
    color: var(--must-color);
    border-color: var(--must-border);
}

.toolbar button.danger:hover {
    background: var(--must-bg);
}

.toolbar button .icon {
    font-size: 0.85rem;
}

.col-toggle {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.2rem 0.6rem;
    font-size: 0.76rem;
    font-weight: 500;
    background: white;
    color: var(--text);
}

.col-toggle-label {
    color: var(--text-light);
    margin-right: 0.1rem;
}

.col-toggle-option {
    display: flex;
    align-items: center;
    gap: 0.2rem;
    cursor: pointer;
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
    transition: background 0.15s;
}

.col-toggle-option:has(input:checked) {
    background: #e8f4fd;
    color: #2980b9;
}

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

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0.8rem 0.8rem 2rem;
}

.section-divider {
    column-span: all;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--border);
}

.section-divider:first-child {
    margin-top: 0;
}

.cards-grid {
    columns: 380px;
    column-gap: 0.5rem;
}

.cards-grid.cols-1 {
    column-count: 1;
    column-width: auto;
}

.cards-grid.cols-2 {
    column-count: 2;
    column-width: auto;
}

.cards-grid.cols-auto {
    column-count: auto;
    column-width: 380px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--border);
}

.level-badge {
    display: none;
    padding: 0.1rem 0.45rem;
    border-radius: 20px;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: white;
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.level-badge.must {
    background: var(--must-color);
}
.level-badge.should {
    background: var(--should-color);
}
.level-badge.may {
    background: var(--may-color);
}

.flat-mode .section-divider {
    display: none;
}

.flat-mode .level-badge {
    display: inline-block;
}

.section-badge {
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: white;
    flex-shrink: 0;
}

.section-badge.must {
    background: var(--must-color);
}
.section-badge.should {
    background: var(--should-color);
}
.section-badge.may {
    background: var(--may-color);
}

.section-progress {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-left: auto;
    font-weight: 600;
    white-space: nowrap;
}

.principle-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border-left: 4px solid transparent;
    transition:
        border-color 0.3s,
        box-shadow 0.3s;
    break-inside: avoid;
    margin-bottom: 0.5rem;
}

.principle-card.must {
    border-left-color: var(--must-border);
}
.principle-card.should {
    border-left-color: var(--should-border);
}
.principle-card.may {
    border-left-color: var(--may-border);
}

.principle-card.complete {
    border-left-color: var(--check-color) !important;
}

.principle-header {
    padding: 0.6rem 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.principle-code {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.must .principle-code {
    background: var(--must-bg);
    color: var(--must-color);
}
.should .principle-code {
    background: var(--should-bg);
    color: var(--should-color);
}
.may .principle-code {
    background: var(--may-bg);
    color: var(--may-color);
}

.principle-title {
    font-weight: 600;
    font-size: 0.87rem;
    flex: 1;
}

.principle-count {
    font-size: 0.72rem;
    color: var(--text-light);
    white-space: nowrap;
    margin-top: 0.1rem;
    flex-shrink: 0;
    font-weight: 600;
}

.principle-count.done {
    color: var(--check-color);
}

.checklist {
    padding: 0 0.9rem 0.6rem 0.9rem;
    display: block;
}

.check-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.3rem 0;
    border-top: 1px solid #f0f0f0;
}

.check-item:first-child {
    border-top: 1px solid var(--border);
}

.check-item input[type="checkbox"] {
    display: none;
}

.check-item label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.82rem;
    width: 100%;
    line-height: 1.4;
}

.checkbox-custom {
    width: 16px;
    height: 16px;
    min-width: 16px;
    border: 2px solid #ccc;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin-top: 1px;
    font-size: 0.65rem;
    color: transparent;
}

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

.check-item input:checked + label .check-text {
    color: var(--text-light);
    text-decoration: line-through;
    text-decoration-color: #ccc;
}

.check-text {
    transition: color 0.2s;
}

/* Response mode */
.response-ui {
    display: none;
    width: 100%;
}

#app.mode-responses .check-item > label {
    display: none;
}

#app.mode-responses .response-ui {
    display: block;
}

.response-row {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    width: 100%;
}

.response-row .check-text {
    flex: 1;
}

.response-btns {
    display: flex;
    gap: 0.3rem;
    flex-shrink: 0;
}

.response-btn {
    padding: 0.15rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: white;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.15s;
    color: var(--text-light);
}

.response-btn:hover {
    border-color: #aaa;
    background: #f5f5f5;
}

.response-btn.yes-btn.active {
    background: var(--may-bg);
    border-color: var(--check-color);
    color: var(--check-color);
}

.response-btn.no-btn.active {
    background: var(--must-bg);
    border-color: var(--must-border);
    color: var(--must-color);
}

.reason-input {
    display: none;
    width: 100%;
    margin-top: 0.3rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.4rem 0.5rem;
    font-size: 0.78rem;
    font-family: inherit;
    resize: vertical;
    color: var(--text);
    background: #fafafa;
    min-height: 2.5rem;
}

.reason-input.visible {
    display: block;
}

.reason-input:focus {
    outline: none;
    border-color: var(--must-border);
    background: white;
}

code {
    background: #f0f0f0;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    font-size: 0.83em;
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
    color: #c0392b;
}

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #2c3e50;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-size: 0.9rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    transition: transform 0.4s ease;
    pointer-events: none;
}

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

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    justify-content: center;
    align-items: center;
}
.modal-overlay.show {
    display: flex;
}

.modal {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    max-width: 520px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal h2 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.modal textarea {
    width: 100%;
    height: 80px;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.7rem;
    font-family: monospace;
    font-size: 0.8rem;
    resize: vertical;
    margin-bottom: 1rem;
}

.modal-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.modal-buttons button {
    padding: 0.5rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    background: white;
    transition: all 0.2s;
}

.modal-buttons button.primary {
    background: #3498db;
    color: white;
    border-color: #3498db;
}

.modal-buttons button:hover {
    opacity: 0.85;
}

.intro-text {
    background: white;
    border-radius: var(--radius);
    padding: 0.8rem 1rem;
    margin-bottom: 0.8rem;
    box-shadow: var(--shadow);
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.5;
}

.legend {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-top: 0.4rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.76rem;
    font-weight: 600;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.must {
    background: var(--must-color);
}
.legend-dot.should {
    background: var(--should-color);
}
.legend-dot.may {
    background: var(--may-color);
}

.version-indicator {
    position: fixed;
    bottom: 0.5rem;
    left: 0.5rem;
    font-size: 0.65rem;
    color: var(--text-light);
    opacity: 0.5;
    z-index: 50;
    pointer-events: none;
}

@media print {
    .header {
        position: relative;
    }
    .toolbar {
        display: none !important;
    }
    .toast {
        display: none !important;
    }
    .modal-overlay {
        display: none !important;
    }
    body {
        background: white;
        padding: 0;
    }
    .container {
        max-width: 100%;
        padding: 0;
    }
    .principle-card {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
    .intro-text {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    .check-item input:checked + label .checkbox-custom {
        border-color: #333;
        color: #333;
        background: white;
    }
    .check-item input:checked + label .check-text {
        text-decoration: none;
        color: var(--text);
    }
    .checkbox-custom {
        border: 2px solid #333 !important;
    }
    .check-item input:not(:checked) + label .checkbox-custom::after {
        content: "";
    }
    .check-item input:checked + label .checkbox-custom::after {
        content: "✓";
    }
    /* Response mode print styles */
    .response-btn {
        border: 1px solid #ddd !important;
        color: #999 !important;
        background: white !important;
    }
    .response-btn.active.yes-btn {
        border-color: #27ae60 !important;
        color: #27ae60 !important;
    }
    .response-btn.active.no-btn {
        border-color: #c0392b !important;
        color: #c0392b !important;
    }
    .reason-input.visible {
        display: block !important;
        border: 1px solid #ddd !important;
        background: white !important;
    }
    .version-indicator {
        position: fixed;
        bottom: 0.25rem;
        left: 0.25rem;
        opacity: 1;
        font-size: 0.6rem;
        color: #555;
    }
    .progress-bar-container {
        display: none;
    }
    .progress-text {
        display: none;
    }
}

@media (max-width: 600px) {
    .header h1 {
        font-size: 1.1rem;
    }
    .toolbar {
        gap: 0.25rem;
    }
    .toolbar button {
        padding: 0.3rem 0.5rem;
        font-size: 0.7rem;
    }
    .principle-header {
        padding: 0.5rem 0.7rem;
    }
    .checklist {
        padding: 0 0.7rem 0.5rem;
    }
}