/* ============================================================
   Digital Productivity Unit Assessment Platform V2 - Styles
   Enterprise-grade, warm neutral, card-based workbench
   ============================================================ */

:root {
    --primary: #2563eb;
    --primary-light: #dbeafe;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --success-light: #dcfce7;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --info: #0891b2;
    --info-light: #cffafe;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --bg: #f8f9fb;
    --card-bg: #ffffff;
    --border: #e5e7eb;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.07), 0 4px 6px rgba(0,0,0,0.04);
    --radius: 8px;
    --radius-lg: 12px;

    --label-a: #16a34a;
    --label-a-bg: #dcfce7;
    --label-b: #2563eb;
    --label-b-bg: #dbeafe;
    --label-c: #d97706;
    --label-c-bg: #fef3c7;
    --label-d: #dc2626;
    --label-d-bg: #fee2e2;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
.app-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
}

.version-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

.domain-badge {
    background: var(--gray-100);
    color: var(--gray-600);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
}

.header-nav {
    display: flex;
    gap: 4px;
}

.nav-item {
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    color: var(--gray-600);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    min-height: calc(100vh - 120px);
}

.page { display: none; }
.page.active { display: block; }

/* Footer */
.app-footer {
    text-align: center;
    padding: 16px;
    color: var(--gray-400);
    font-size: 12px;
    border-top: 1px solid var(--border);
    background: var(--card-bg);
}

/* ============================================================
   Common Components
   ============================================================ */

/* Page Title */
.page-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.page-subtitle {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 24px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title .icon {
    font-size: 18px;
}

/* Grid Layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

@media (max-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .app-header { flex-direction: column; height: auto; padding: 12px; gap: 8px; }
    .header-nav { flex-wrap: wrap; justify-content: center; }
}

/* Labels */
.label {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    line-height: 20px;
}

.label-a { background: var(--label-a-bg); color: var(--label-a); }
.label-b { background: var(--label-b-bg); color: var(--label-b); }
.label-c { background: var(--label-c-bg); color: var(--label-c); }
.label-d { background: var(--label-d-bg); color: var(--label-d); }

.label-pass { background: var(--success-light); color: var(--success); }
.label-conditional { background: var(--warning-light); color: var(--warning); }
.label-fail { background: var(--danger-light); color: var(--danger); }

.label-platform { background: #ede9fe; color: #7c3aed; }
.label-agent { background: #fce7f3; color: #db2777; }
.label-workflow { background: #ccfbf1; color: #0d9488; }

/* Stat Cards */
.stat-card {
    text-align: center;
    padding: 16px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}

/* Progress Bar */
.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin: 4px 0;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.6s ease;
}

.progress-fill.high { background: var(--success); }
.progress-fill.medium { background: var(--warning); }
.progress-fill.low { background: var(--danger); }

/* Score Display */
.score-display {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.score-value {
    font-size: 24px;
    font-weight: 700;
}

.score-max {
    font-size: 13px;
    color: var(--gray-400);
}

.score-high { color: var(--success); }
.score-medium { color: var(--warning); }
.score-low { color: var(--danger); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--gray-600);
    border-color: var(--gray-300);
}

.btn-outline:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 2px 8px;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: 4px;
    font-size: 11px;
    margin: 2px;
}

.tag-primary {
    background: var(--primary-light);
    color: var(--primary);
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.data-table th {
    background: var(--gray-50);
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-600);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.data-table tr:hover td {
    background: var(--gray-50);
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--gray-500);
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb .sep {
    color: var(--gray-300);
}

/* ============================================================
   Overview Page
   ============================================================ */

.overview-hero {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
}

.overview-hero h2 {
    font-size: 20px;
    margin-bottom: 8px;
}

.overview-hero p {
    font-size: 14px;
    opacity: 0.85;
    line-height: 1.7;
}

.overview-hero .hero-tags {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.overview-hero .hero-tag {
    background: rgba(255,255,255,0.2);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
}

.overview-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.flow-step {
    background: rgba(255,255,255,0.15);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
}

.flow-arrow {
    font-size: 16px;
    opacity: 0.6;
}

/* ============================================================
   Track Cards
   ============================================================ */

.track-card {
    border-left: 4px solid var(--primary);
    cursor: pointer;
    transition: all 0.2s;
}

.track-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.track-card.track-sourcing { border-left-color: #7c3aed; }
.track-card.track-interview { border-left-color: #0891b2; }
.track-card.track-fullcycle { border-left-color: #d97706; }

.track-card .track-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.track-card .track-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
}

.track-card .track-count {
    background: var(--gray-100);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    color: var(--gray-600);
    font-weight: 600;
}

.track-card .track-desc {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 12px;
    line-height: 1.6;
}

.track-card .track-dims {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 12px;
}

.track-card .track-labels {
    display: flex;
    gap: 6px;
}

/* ============================================================
   SKU Cards
   ============================================================ */

.sku-card {
    position: relative;
    transition: all 0.2s;
}

.sku-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.sku-card .sku-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.sku-card .sku-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-900);
}

.sku-card .sku-vendor {
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.sku-card .sku-desc {
    font-size: 13px;
    color: var(--gray-600);
    margin-bottom: 12px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sku-card .sku-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.sku-card .sku-scores {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.sku-card .sku-actions {
    display: flex;
    gap: 6px;
    margin-top: 12px;
}

.sku-card .compare-checkbox {
    position: absolute;
    top: 12px;
    right: 12px;
}

/* ============================================================
   SKU Detail Page
   ============================================================ */

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

.detail-title {
    font-size: 24px;
    font-weight: 700;
}

.detail-vendor {
    font-size: 14px;
    color: var(--gray-500);
    margin-top: 4px;
}

.detail-badges {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.detail-section {
    margin-bottom: 24px;
}

.detail-section-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
}

.gate-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius);
    margin-bottom: 8px;
}

.gate-item.passed {
    background: var(--success-light);
}

.gate-item.failed {
    background: var(--danger-light);
}

.gate-icon {
    font-size: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

.gate-content .gate-name {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 2px;
}

.gate-content .gate-reason {
    font-size: 13px;
    color: var(--gray-600);
}

.dimension-bar {
    margin-bottom: 12px;
}

.dimension-bar .dim-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

.dimension-bar .dim-name {
    font-size: 13px;
    font-weight: 500;
}

.dimension-bar .dim-score {
    font-size: 13px;
    font-weight: 700;
}

.dimension-bar .dim-comment {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}

/* Strengths / Weaknesses */
.sw-list {
    list-style: none;
    padding: 0;
}

.sw-list li {
    padding: 6px 0;
    font-size: 13px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.sw-list li::before {
    flex-shrink: 0;
    margin-top: 2px;
}

.sw-list.strengths li::before { content: "✅"; }
.sw-list.weaknesses li::before { content: "⚠️"; }
.sw-list.suitable li::before { content: "👍"; }
.sw-list.not-suitable li::before { content: "👎"; }

/* ============================================================
   Compare Page
   ============================================================ */

.compare-selector {
    margin-bottom: 24px;
}

.compare-selector .selected-skus {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.compare-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.compare-chip .remove-btn {
    cursor: pointer;
    font-size: 14px;
    opacity: 0.7;
}

.compare-chip .remove-btn:hover {
    opacity: 1;
}

.compare-table-wrapper {
    overflow-x: auto;
}

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

.compare-table th {
    background: var(--gray-50);
    padding: 10px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-600);
    border-bottom: 2px solid var(--border);
    min-width: 180px;
}

.compare-table th:first-child {
    min-width: 160px;
    position: sticky;
    left: 0;
    background: var(--gray-50);
    z-index: 1;
}

.compare-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.compare-table td:first-child {
    font-weight: 600;
    color: var(--gray-700);
    position: sticky;
    left: 0;
    background: var(--card-bg);
    z-index: 1;
}

.compare-table .row-group-header td {
    background: var(--gray-50);
    font-weight: 700;
    color: var(--gray-800);
    font-size: 13px;
}

/* ============================================================
   Scenario & Bundle Pages
   ============================================================ */

.scenario-card {
    border-left: 4px solid var(--info);
    margin-bottom: 16px;
}

.scenario-card .scenario-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.scenario-card .scenario-problem {
    font-size: 13px;
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.6;
}

.scenario-card .recommended-skus {
    margin-top: 12px;
}

.recommended-sku-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px;
    background: var(--gray-50);
    border-radius: var(--radius);
    margin-bottom: 8px;
}

.recommended-sku-item .sku-rank {
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

.recommended-sku-item .sku-info .sku-name {
    font-weight: 600;
    font-size: 14px;
}

.recommended-sku-item .sku-info .sku-reason {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 2px;
}

.bundle-card {
    border-top: 4px solid var(--primary);
    margin-bottom: 16px;
}

.bundle-card .bundle-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.bundle-card .bundle-target {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.bundle-component {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--gray-50);
    border-radius: var(--radius);
    margin-bottom: 8px;
}

.bundle-component .comp-role {
    font-size: 11px;
    color: var(--primary);
    font-weight: 600;
    background: var(--primary-light);
    padding: 2px 8px;
    border-radius: 4px;
    white-space: nowrap;
}

.bundle-component .comp-name {
    font-weight: 600;
    font-size: 14px;
}

.bundle-component .comp-desc {
    font-size: 12px;
    color: var(--gray-500);
}

.bundle-section {
    margin-top: 16px;
}

.bundle-section h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.bundle-section ul {
    list-style: none;
    padding: 0;
}

.bundle-section ul li {
    font-size: 13px;
    padding: 3px 0;
    color: var(--gray-600);
}

.bundle-section.advantages ul li::before { content: "✅ "; }
.bundle-section.risks ul li::before { content: "⚠️ "; }

/* Task Evidence */
.task-evidence-card {
    margin-bottom: 12px;
    padding: 16px;
}

.task-evidence-card .task-name {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}

.task-evidence-card .task-desc {
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.task-evidence-card .task-score {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.task-evidence-card .task-summary {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}

/* Chart Container */
.chart-container {
    position: relative;
    width: 100%;
    max-height: 300px;
}

/* Info Box */
.info-box {
    background: var(--info-light);
    border: 1px solid #a5f3fc;
    border-radius: var(--radius);
    padding: 12px 16px;
    font-size: 13px;
    color: var(--gray-700);
    margin-bottom: 16px;
    line-height: 1.6;
}

.info-box strong {
    color: var(--gray-900);
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-bar select {
    padding: 6px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 13px;
    color: var(--gray-700);
    background: white;
    cursor: pointer;
}

.filter-bar select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

/* Scatter Plot Area */
.scatter-container {
    position: relative;
    height: 350px;
    margin: 16px 0;
}

/* ROI Badge */
.roi-badge {
    background: linear-gradient(135deg, #dcfce7, #bbf7d0);
    border: 1px solid #86efac;
    border-radius: var(--radius);
    padding: 12px 16px;
    font-size: 13px;
    color: #166534;
    font-weight: 500;
}

/* Methodology Section */
.methodology-card {
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
}

.methodology-card h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.methodology-card p {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.6;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--gray-400);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-400);
}

.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.empty-state p {
    font-size: 14px;
}