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

:root {
    --bg: #f6f6f3;
    --surface: #ffffff;
    --surface-muted: #f1f1ee;
    --text: #111111;
    --text-muted: #666666;
    --text-soft: #8a8a8a;
    --border: #d8d8d2;
    --border-strong: #111111;
    --black: #111111;
    --white: #ffffff;
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.08);
}

body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    padding: 28px;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.header {
    background: var(--white);
    color: var(--text);
    padding: 34px 40px 30px;
    border-bottom: 1px solid var(--border-strong);
}

.header h1 {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.04em;
    margin-bottom: 8px;
}

.header p {
    color: var(--text-muted);
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    background: var(--surface);
    border-bottom: 1px solid var(--border-strong);
}

.tab {
    padding: 16px 20px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-align: center;
    border-right: 1px solid var(--border);
    transition: background 0.15s ease, color 0.15s ease;
}

.tab:last-child {
    border-right: none;
}

.tab:hover,
.tab.active {
    background: var(--black);
    color: var(--white);
}

.tab-content {
    display: none;
    padding: 32px 40px 42px;
}

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

.section-group {
    display: grid;
    gap: 18px;
}

.section-card,
.result-section,
.operation-card,
.case-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0;
    box-shadow: none;
}

.section-card,
.result-section {
    padding: 22px;
}

.section-card h3,
.result-section h3 {
    color: var(--text);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 14px;
}

.result-section h4 {
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
    margin: 18px 0 10px;
}

textarea,
input[type="file"],
select {
    width: 100%;
    background: var(--white);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    color: var(--text);
    font: inherit;
    padding: 12px 14px;
    transition: outline-offset 0.15s ease, background 0.15s ease;
}

textarea {
    min-height: 130px;
    resize: vertical;
}

textarea:focus,
select:focus,
input[type="file"]:focus {
    outline: 1px solid var(--black);
    outline-offset: 2px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.ai-enhancement-toggle {
    display: inline-flex !important;
    align-items: center;
    gap: 10px;
    width: auto;
    min-height: 40px;
    padding: 8px 12px 8px 10px;
    border: 1px solid var(--border);
    background: var(--surface-muted);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600 !important;
    letter-spacing: 0.01em;
}

.ai-enhancement-toggle input {
    position: relative;
    width: 38px;
    height: 22px;
    margin: 0;
    appearance: none;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--white);
    cursor: pointer;
    transition: background 0.15s ease;
}

.ai-enhancement-toggle input::before {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--black);
    transition: transform 0.15s ease;
}

.ai-enhancement-toggle input:checked {
    background: var(--black);
}

.ai-enhancement-toggle input:checked::before {
    background: var(--white);
    transform: translateX(16px);
}

.ai-enhancement-toggle span {
    line-height: 1.2;
}

.form-col label,
.external-conditions label {
    display: block;
    color: var(--text);
    font-weight: 500;
    margin-bottom: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 18px;
    margin: 0 10px 10px 0;
    background: var(--white);
    border: 1px solid var(--black);
    border-radius: 0;
    color: var(--black);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: background 0.15s ease, color 0.15s ease;
}

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

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

.btn-secondary:hover {
    background: var(--surface-muted);
    color: var(--black);
}

.btn-sm {
    min-height: 36px;
    padding: 8px 14px;
    font-size: 12px;
}

.btn:disabled {
    border-color: var(--border);
    color: var(--text-soft);
    cursor: not-allowed;
}

.loading {
    display: none;
    padding: 36px;
    text-align: center;
    color: var(--text-muted);
}

.loading.active {
    display: block;
}

.spinner {
    width: 28px;
    height: 28px;
    margin: 0 auto 14px;
    border: 1px solid var(--border);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.result {
    display: none;
    margin-top: 22px;
}

.result.active {
    display: block;
}

.result-section {
    margin-bottom: 18px;
}

.progress-panel {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    text-align: left;
}

.progress-panel-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 12px;
    font-size: 15px;
}

.progress-panel-header span {
    color: var(--text-muted);
    font-size: 13px;
}

.progress-current {
    padding: 12px 14px;
    margin-bottom: 14px;
    background: var(--black);
    color: var(--white);
}

.progress-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 10px;
}

.progress-step {
    padding: 10px 12px;
    border: 1px solid var(--border);
    background: var(--surface-muted);
}

.progress-step.active {
    border-color: var(--black);
    background: var(--white);
    box-shadow: inset 0 0 0 1px var(--black);
}

.progress-inline-spinner,
.progress-step-spinner {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 8px;
    border: 1px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: -1px;
}

.progress-inline-spinner {
    color: var(--white);
}

.progress-step-spinner {
    color: var(--black);
}

.progress-step strong,
.progress-step span {
    display: block;
}

.progress-step span {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 4px;
}

.drawing-explanations {
    display: grid;
    gap: 16px;
}

.drawing-card {
    border: 1px solid var(--border-strong);
    background: var(--white);
    padding: 16px;
    margin-bottom: 14px;
}

.drawing-card-header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 10px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.drawing-card-header span {
    color: var(--text-muted);
    word-break: break-all;
}

.drawing-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 14px;
    align-items: start;
}

.drawing-preview {
    display: block;
    max-width: 100%;
    max-height: 520px;
    object-fit: contain;
    border: 1px solid var(--border);
    background: var(--surface-muted);
}

.annotation-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.annotation-table th,
.annotation-table td {
    border: 1px solid var(--border);
    padding: 7px 8px;
    vertical-align: top;
}

.annotation-table input,
.annotation-table select {
    min-width: 130px;
    padding: 6px 8px;
    font-size: 12px;
}

.flow-readable-hint {
    color: var(--text-muted);
    margin-bottom: 14px;
}

.readable-flow {
    display: grid;
    gap: 8px;
    max-width: 980px;
}

.flow-step-card {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--border-strong);
    background: var(--white);
}

.flow-step-index {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    background: var(--black);
    color: var(--white);
    font-weight: 700;
}

.flow-step-body {
    min-width: 0;
}

.flow-step-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.flow-step-body p {
    color: var(--text);
    margin-bottom: 10px;
}

.flow-step-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.flow-step-meta span {
    border: 1px solid var(--border);
    background: var(--surface-muted);
    padding: 3px 7px;
    font-size: 12px;
    color: var(--text-muted);
}

.flow-step-points {
    padding: 8px 10px;
    border-left: 3px solid var(--black);
    background: var(--surface-muted);
    color: var(--text);
}

.flow-step-arrow {
    width: 42px;
    text-align: center;
    color: var(--text-muted);
    font-size: 20px;
    line-height: 1;
}

.technical-flow-details {
    margin-top: 18px;
    border: 1px solid var(--border);
    background: var(--surface-muted);
}

.technical-flow-details summary {
    cursor: pointer;
    padding: 12px 14px;
    font-weight: 600;
}

.mermaid-scroll {
    overflow: auto;
    max-width: 100%;
    max-height: 70vh;
    padding: 14px;
    background: var(--white);
    border-top: 1px solid var(--border);
}

.mermaid-diagram {
    min-width: 960px;
    width: max-content;
}

.mermaid-diagram svg {
    max-width: none !important;
    height: auto !important;
}

.operation-card {
    padding: 18px;
    margin-bottom: 12px;
}

.operation-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.operation-no {
    min-width: 38px;
    padding: 3px 8px;
    background: var(--black);
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    text-align: center;
}

.operation-name {
    flex: 1;
    color: var(--text);
    font-size: 15px;
    font-weight: 600;
}

.worker-guidance {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 10px;
    margin: 14px 0;
}

.worker-guidance-block {
    border: 1px solid var(--border);
    background: var(--surface-muted);
    padding: 10px 12px;
}

.worker-guidance-block strong {
    display: block;
    margin-bottom: 6px;
}

.worker-guidance-block ul {
    margin-left: 18px;
}

.worker-guidance-block li {
    margin: 4px 0;
}

.operation-type,
.badge,
.case-status {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--black);
    background: var(--white);
    color: var(--black);
    font-size: 11px;
    line-height: 1;
    padding: 4px 7px;
    margin-left: 5px;
}

.badge.mandatory,
.badge.review,
.case-status.approved,
.case-status.reviewed,
.case-status.draft {
    background: var(--white);
    color: var(--black);
}

.warning,
.info,
.critical,
.success,
.file-info,
.upload-summary,
.help-text {
    padding: 12px 14px;
    margin: 10px 0;
    border: 1px solid var(--border-strong);
    border-radius: 0;
    background: var(--surface-muted);
    color: var(--text);
}

.critical {
    background: #111111;
    color: #ffffff;
}

.success {
    background: #ffffff;
}

.part-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 10px 18px;
    margin-bottom: 16px;
}

.cases-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.cases-filter select {
    max-width: 220px;
}

.case-item {
    padding: 16px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.case-item:hover {
    background: var(--surface-muted);
}

.case-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.case-title {
    color: var(--text);
    font-size: 15px;
    font-weight: 600;
}

.settings-info {
    color: var(--text-muted);
    line-height: 2;
}

.settings-info strong {
    color: var(--text);
}

.mermaid-diagram {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 0;
    overflow-x: auto;
    padding: 18px;
}

.raw-text-preview {
    max-height: 260px;
    overflow: auto;
    padding: 15px;
    background: var(--black);
    color: var(--white);
    border-radius: 0;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    font-size: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
}

p[style],
span[style] {
    color: inherit !important;
    background: transparent !important;
}

@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .header,
    .tab-content {
        padding: 24px 18px;
    }

    .tabs {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}