:root {
            --header-bg: #1a1f2e;
            --header-text: #ffffff;
            --bg-primary: #ffffff;
            --bg-secondary: #f8f9fa;
            --bg-card: #ffffff;
            --text-primary: #1a202c;
            --text-secondary: #4a5568;
            --text-muted: #718096;
            --accent-teal: #2b6cb0;
            --accent-coral: #996060;
            --accent-warm: #c05621;
            --accent-green: #2f855a;
            --border: #e2e8f0;
            --shadow: 0 1px 3px rgba(0,0,0,0.08);
            --manza: #c05621;
            --sesoko: #2b6cb0;
            --ogasawara: #2f855a;
            --turbidity-color: #8b7355;
        }

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

        body {
            font-family: 'DM Sans', 'Noto Sans JP', sans-serif;
            background: var(--bg-secondary);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
        }

        body.ja {
            font-family: 'Noto Sans JP', 'DM Sans', sans-serif;
        }

        header {
            background: var(--header-bg);
            color: var(--header-text);
            padding: 0.75rem 2rem;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-weight: 600;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
            color: inherit;
        }

        .logo-icon {
            overflow: hidden;
            width: 28px;
            height: 28px;
            background: linear-gradient(135deg, #5b9a94 0%, #2b6cb0 100%);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
        }

        .header-controls {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .lang-switch {
            font-size: 0.8rem;
            display: flex;
            gap: 0.25rem;
        }

        .lang-switch button {
            background: none;
            border: none;
            color: rgba(255,255,255,0.6);
            cursor: pointer;
            font-size: 0.8rem;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            transition: all 0.2s;
        }

        .lang-switch button:hover { color: rgba(255,255,255,0.9); }
        .lang-switch button.active { color: #ffffff; background: rgba(255,255,255,0.15); }

        main {
            max-width: 900px;
            margin: 0 auto;
            padding: 2.5rem 2rem;
        }

        .breadcrumb {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 1.5rem;
        }

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

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

        .page-header {
            margin-bottom: 2.5rem;
        }

        .page-header h1 {
            font-size: 1.75rem;
            font-weight: 600;
            letter-spacing: -0.02em;
            margin-bottom: 0.75rem;
        }

        body.ja .page-header h1 {
            font-size: 1.5rem;
            letter-spacing: 0;
        }

        .page-header .lead {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 720px;
        }

        body.ja .page-header .lead {
            line-height: 2;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
        }

        .card-title {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border);
        }

        .card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
            line-height: 1.8;
        }

        .card p:last-child {
            margin-bottom: 0;
        }

        body.ja .card p {
            line-height: 2;
        }

        /* Status card */
        .status-card {
            background: #f7f5f3;
            border: 1px solid #d4cfc7;
            border-left: 4px solid var(--turbidity-color);
        }

        .status-card .card-title {
            color: var(--turbidity-color);
        }

        .status-badge {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            background: #e8e4df;
            color: var(--turbidity-color);
            margin-left: 0.5rem;
        }

        /* Threshold table */
        .threshold-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.8rem;
            margin: 1rem 0;
        }

        .threshold-table th,
        .threshold-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }

        .threshold-table th {
            background: var(--bg-secondary);
            font-weight: 600;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-muted);
        }

        .threshold-table td {
            color: var(--text-secondary);
        }

        .threshold-value {
            font-family: 'JetBrains Mono', monospace;
            font-weight: 500;
            color: var(--text-primary);
        }

        /* Comparison grid */
        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin: 1rem 0;
        }

        @media (max-width: 640px) {
            .comparison-grid { grid-template-columns: 1fr; }
        }

        .comparison-item {
            padding: 1rem;
            border-radius: 6px;
            background: var(--bg-secondary);
        }

        .comparison-item.satellite {
            border-left: 3px solid var(--accent-teal);
        }

        .comparison-item.insitu {
            border-left: 3px solid var(--turbidity-color);
        }

        .comparison-item h4 {
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-primary);
        }

        .comparison-item ul {
            font-size: 0.8rem;
            color: var(--text-secondary);
            padding-left: 1rem;
            margin: 0;
        }

        .comparison-item li {
            margin-bottom: 0.35rem;
        }

        /* Profile mockup */
        .profile-mockup {
            background: var(--bg-secondary);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1rem 0;
        }

        .profile-mockup svg {
            width: 100%;
            height: auto;
        }

        .profile-label {
            font-size: 0.7rem;
            color: var(--text-muted);
            text-align: center;
            margin-top: 0.5rem;
        }

        /* No data notice */
        .no-data-notice {
            background: #f5f5f5;
            border: 2px dashed #d0d0d0;
            border-radius: 8px;
            padding: 2rem;
            text-align: center;
            margin: 1.5rem 0;
        }

        .no-data-notice .icon {
            font-size: 2rem;
            margin-bottom: 0.75rem;
        }

        .no-data-notice p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* References */
        .references {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border);
        }

        .references h3 {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-muted);
            margin-bottom: 1rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .ref-list {
            list-style: none;
            padding: 0;
        }

        .ref-list li {
            font-size: 0.75rem;
            color: var(--text-secondary);
            margin-bottom: 0.75rem;
            padding-left: 1rem;
            border-left: 2px solid var(--border);
            line-height: 1.6;
        }

        .ref-list a {
            color: var(--accent-teal);
            text-decoration: none;
        }

        .ref-list a:hover {
            text-decoration: underline;
        }

        .ref-category {
            font-size: 0.7rem;
            font-weight: 600;
            color: var(--text-muted);
            margin-top: 1rem;
            margin-bottom: 0.5rem;
            text-transform: uppercase;
            letter-spacing: 0.03em;
        }

        /* Footer */
        footer {
            max-width: 900px;
            margin: 0 auto;
            padding: 2rem;
            text-align: center;
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        footer a {
            color: var(--accent-teal);
            text-decoration: none;
        }

        /* Key insight box */
        .insight-box {
            background: linear-gradient(135deg, #faf9f7 0%, #f5f3f0 100%);
            border: 1px solid #e8e4df;
            border-radius: 8px;
            padding: 1.25rem;
            margin: 1rem 0;
        }

        .insight-box .insight-label {
            font-size: 0.65rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--turbidity-color);
            margin-bottom: 0.5rem;
        }

        .insight-box blockquote {
            font-size: 0.85rem;
            font-style: italic;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.7;
        }

        .insight-box .source {
            font-size: 0.7rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
            font-style: normal;
        }