/* ==========================================================================
   가시설해석 웹 SaaS 스타일시트 (반응형 엔지니어링 워크벤치 레이아웃)
   ========================================================================== */

:root {
    --bg-main: #f1f5f9;
    --bg-panel: #ffffff;
    --bg-header: #0f172a;
    --bg-sub: #f8fafc;
    --border-color: #cbd5e1;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent-primary: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-success: #059669;
    --accent-warn: #d97706;
    --accent-danger: #dc2626;
}

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

html, body {
    width: 100%;
    height: 100%;
    font-family: 'Pretendard', 'Malgun Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.45;
    overflow: hidden;
}

/* 전체 애플리케이션 컨테이너 */
.app-shell {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
}

/* 1. 상단 글로벌 헤더 및 워크플로우 바 */
.top-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-header);
    color: #ffffff;
    padding: 0.6rem 1.2rem;
    border-bottom: 1px solid #334155;
    flex-shrink: 0;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.brand-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #ffffff;
}

.brand-subtitle {
    font-size: 0.8rem;
    color: #94a3b8;
    border-left: 1px solid #475569;
    padding-left: 0.75rem;
}

.engine-badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-weight: 600;
    background-color: #334155;
    color: #cbd5e1;
}

.engine-badge.ready {
    background-color: #065f46;
    color: #a7f3d0;
}

/* 5단계 워크플로우 네비게이션 탭 */
.workflow-nav {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background-color: #1e293b;
    padding: 0.25rem;
    border-radius: 0.5rem;
}

.wf-step-btn {
    background: transparent;
    border: none;
    color: #cbd5e1;
    padding: 0.45rem 0.9rem;
    border-radius: 0.35rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.wf-step-btn:hover:not(:disabled) {
    background-color: #334155;
    color: #ffffff;
}

.wf-step-btn.active {
    background-color: var(--accent-primary);
    color: #ffffff;
}

.wf-step-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.wf-arrow {
    color: #64748b;
    font-size: 0.75rem;
    user-select: none;
}

/* 우측 유틸리티 및 실행 영역 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.preset-select {
    background-color: #1e293b;
    color: #f8fafc;
    border: 1px solid #475569;
    padding: 0.4rem 0.7rem;
    border-radius: 0.35rem;
    font-size: 0.82rem;
    cursor: pointer;
}

.btn-solve-main {
    background-color: var(--accent-success);
    color: #ffffff;
    border: none;
    padding: 0.45rem 1rem;
    border-radius: 0.35rem;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.15s;
}

.btn-solve-main:hover:not(:disabled) {
    background-color: #047857;
}

.btn-solve-main.needs-solve {
    background-color: var(--accent-warn);
}

/* 상태 알림 배너 */
.status-banner {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 0.45rem 1.2rem;
    font-size: 0.82rem;
    font-weight: 600;
    flex-shrink: 0;
}

.status-banner.warn {
    display: flex;
    background-color: #fef3c7;
    color: #92400e;
    border-bottom: 1px solid #fde68a;
}

.status-banner.error {
    display: flex;
    background-color: #fee2e2;
    color: #991b1b;
    border-bottom: 1px solid #fecaca;
}

/* 2. 메인 워크스페이스 (반응형 분할 레이아웃) */
.workspace-body {
    flex: 1;
    display: flex;
    overflow: hidden;
    padding: 0.75rem;
    gap: 0.75rem;
}

/* 전처리 모드 레이아웃: 좌측 입력 패널 + 우측 2D 단면 뷰어 */
.preproc-container {
    display: flex;
    width: 100%;
    height: 100%;
    gap: 0.75rem;
}

.input-column {
    flex: 1.15;
    min-width: 320px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.preview-column {
    flex: 1;
    min-width: 300px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 후처리(해석결과) 모드 레이아웃: 3분할 반응형 */
.postproc-container {
    display: none;
    flex-direction: column;
    width: 100%;
    height: 100%;
    gap: 0.75rem;
}

.result-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.6rem 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
    flex-shrink: 0;
}

.stage-selector-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.stage-pill-btn {
    background-color: var(--bg-sub);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.35rem 0.75rem;
    border-radius: 0.35rem;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
}

.stage-pill-btn.active {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #ffffff;
}

.kpi-cards-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.kpi-item {
    display: flex;
    flex-direction: column;
    border-left: 3px solid var(--accent-primary);
    padding-left: 0.6rem;
}

.kpi-label {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.kpi-val {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-panels-grid {
    flex: 1;
    display: flex;
    gap: 0.75rem;
    overflow: hidden;
}

.result-col-summary {
    flex: 0.95;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.result-col-section {
    flex: 1.05;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.result-col-charts {
    flex: 1.3;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 패널 공통 헤더 및 바디 */
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 1rem;
    background-color: var(--bg-sub);
    border-bottom: 1px solid var(--border-color);
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.panel-body {
    flex: 1;
    padding: 0.9rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 섹션 카드 및 폼 컨트롤 */
.section-box {
    border: 1px solid var(--border-color);
    border-radius: 0.4rem;
    background-color: #ffffff;
    overflow: hidden;
}

.section-box-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #f8fafc;
    padding: 0.5rem 0.8rem;
    border-bottom: 1px solid var(--border-color);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.section-box-content {
    padding: 0.75rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 0.65rem;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.form-field label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-field input, .form-field select {
    padding: 0.38rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.3rem;
    font-size: 0.83rem;
    color: var(--text-primary);
    background-color: #ffffff;
}

.form-field input:focus, .form-field select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* 데이터 입력 그리드 테이블 */
.data-table-wrap {
    width: 100%;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.data-table th, .data-table td {
    border: 1px solid var(--border-color);
    padding: 0.35rem 0.45rem;
    text-align: center;
}

.data-table th {
    background-color: #f1f5f9;
    font-weight: 700;
    color: var(--text-secondary);
    white-space: nowrap;
}

.data-table td input, .data-table td select {
    width: 100%;
    border: 1px solid transparent;
    background: transparent;
    text-align: center;
    font-size: 0.8rem;
    padding: 0.2rem;
    border-radius: 0.2rem;
}

.data-table td input:focus, .data-table td select:focus {
    border-color: var(--accent-primary);
    background-color: #ffffff;
    outline: none;
}

.data-table tr.selected-row {
    background-color: #eff6ff;
}

/* 소형 액션 버튼 */
.btn-sm {
    padding: 0.25rem 0.6rem;
    font-size: 0.76rem;
    font-weight: 600;
    border-radius: 0.3rem;
    border: 1px solid var(--border-color);
    background-color: #ffffff;
    cursor: pointer;
}

.btn-sm.primary {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #ffffff;
}

.btn-sm.danger {
    color: var(--accent-danger);
    border-color: #fca5a5;
}

/* SVG 캔버스 뷰포트 영역 */
.svg-viewport {
    flex: 1;
    width: 100%;
    height: 100%;
    background-color: #f8fafc;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.svg-viewport svg {
    width: 100%;
    height: 100%;
}

/* 차트 서브 탭 */
.chart-tabs {
    display: flex;
    gap: 0.3rem;
}

.chart-tab-btn {
    padding: 0.3rem 0.65rem;
    font-size: 0.78rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background-color: #ffffff;
    border-radius: 0.3rem;
    cursor: pointer;
}

.chart-tab-btn.active {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #ffffff;
}

/* 교차 검증 비교 아코디언 */
.overlay-box {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-sub);
    padding: 0.6rem 0.9rem;
    flex-shrink: 0;
}

.overlay-textarea {
    width: 100%;
    height: 4.2rem;
    font-family: monospace;
    font-size: 0.76rem;
    padding: 0.4rem;
    border: 1px solid var(--border-color);
    border-radius: 0.3rem;
    margin-top: 0.4rem;
}