: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);
            --spawning-purple: #8b5cf6;
            --spawning-light: #f5f3ff;
            --spawning-border: #ddd6fe;
            --molecule-blue: #3b82f6;
            --molecule-light: #eff6ff;
            --molecule-border: #bfdbfe;
            --disruption-red: #ef4444;
            --disruption-light: #fef2f2;
            --disruption-border: #fecaca;
            --story-bg: #fffbeb;
            --story-border: #fde68a;
            --neap-teal: #0d9488;
            --neap-light: #f0fdfa;
            --neap-border: #99f6e4;
            --hypothesis-orange: #ea580c;
            --hypothesis-light: #fff7ed;
            --hypothesis-border: #fed7aa;
        }

        * { 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: 1.8;
            min-height: 100vh;
        }

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

        /* Header */
        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 {
            width: 28px;
            height: 28px;
            background: linear-gradient(135deg, #5b9a94 0%, #2b6cb0 100%);
            border-radius: 6px;
            overflow: hidden;
        }

        .logo-icon img { width: 100%; height: 100%; object-fit: cover; }

        .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 */
        main {
            max-width: 800px;
            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;
        }

        /* ===== HERO SECTION ===== */
        .hero-section {
            background: linear-gradient(135deg, rgba(5, 30, 45, 0.7), rgba(10, 60, 70, 0.6)), url("../images/bg-spawning.webp");
            color: white;
            padding: 2.5rem 2rem;
            border-radius: 12px;
            margin-bottom: 2.5rem;
            background-size: cover;
            background-position: center top;
        }

        .hero-main {
            text-align: center;
            margin-bottom: 2rem;
        }

        .hero-icon { font-size: 3.5rem; margin-bottom: 0.75rem; }

        .prediction-date {
            font-size: 2.2rem;
            font-weight: 600;
            margin-bottom: 0.25rem;
        }

        body.ja .prediction-date { font-size: 1.8rem; }

        .prediction-time-precise {
            font-size: 1.8rem;
            font-weight: 500;
            margin-bottom: 0.5rem;
            font-family: 'JetBrains Mono', monospace;
        }

        .prediction-time-range {
            font-size: 1rem;
            opacity: 0.9;
            margin-bottom: 0.5rem;
        }

        .prediction-location {
            font-size: 1rem;
            opacity: 0.85;
            margin-bottom: 0.75rem;
        }

        .prediction-basis {
            font-size: 0.85rem;
            background: rgba(255,255,255,0.15);
            padding: 0.5rem 1rem;
            border-radius: 6px;
            display: inline-block;
            margin-bottom: 0.75rem;
        }

        .countdown {
            font-size: 1rem;
            background: rgba(255,255,255,0.2);
            padding: 0.6rem 1.25rem;
            border-radius: 8px;
            display: inline-block;
        }

        /* Dark Period Visualization */
        .dark-period-viz {
            background: rgba(0,0,0,0.2);
            border-radius: 8px;
            padding: 1.25rem;
            margin-top: 1.5rem;
        }

        .dark-period-title {
            font-size: 0.85rem;
            opacity: 0.9;
            margin-bottom: 0.75rem;
            text-align: center;
        }

        .dark-period-bar {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 0.75rem;
        }

        .time-label {
            font-size: 0.75rem;
            font-family: 'JetBrains Mono', monospace;
            min-width: 50px;
            text-align: center;
        }

        .bar-container {
            flex: 1;
            height: 24px;
            background: rgba(255,255,255,0.15);
            border-radius: 4px;
            position: relative;
            overflow: hidden;
        }

        .bar-dark {
            position: absolute;
            height: 100%;
            background: linear-gradient(90deg, #1e1b4b, #312e81);
            border-radius: 4px;
        }

        .bar-spawning {
            position: absolute;
            height: 100%;
            background: #fbbf24;
            opacity: 0.9;
        }

        .dark-period-legend {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            font-size: 0.75rem;
            opacity: 0.85;
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.35rem;
        }

        .legend-dot {
            width: 10px;
            height: 10px;
            border-radius: 2px;
        }

        .legend-dot.dark { background: #312e81; }
        .legend-dot.spawning { background: #fbbf24; }

        /* ===== CONTENT SECTIONS ===== */
        .content-section {
            margin-bottom: 3rem;
        }

        .content-section h2 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

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

        /* ===== STORY BOXES ===== */
        .story-box {
            background: var(--story-bg);
            border: 1px solid var(--story-border);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .story-box .story-lead {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-primary);
            margin-bottom: 1rem;
            line-height: 1.7;
        }

        .story-box p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
            line-height: 1.9;
        }

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

        .story-box .highlight {
            background: rgba(139, 92, 246, 0.15);
            padding: 0.15rem 0.4rem;
            border-radius: 3px;
            font-weight: 500;
        }

        .story-box .emphasis {
            font-weight: 600;
            color: var(--text-primary);
        }

        /* ===== HYPOTHESIS BOX ===== */
        .hypothesis-box {
            background: var(--hypothesis-light);
            border: 2px solid var(--hypothesis-border);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .hypothesis-box .hypothesis-badge {
            display: inline-block;
            background: var(--hypothesis-orange);
            color: white;
            font-size: 0.7rem;
            font-weight: 600;
            padding: 0.25rem 0.6rem;
            border-radius: 4px;
            margin-bottom: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .hypothesis-box .hypothesis-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--hypothesis-orange);
            margin-bottom: 0.75rem;
        }

        .hypothesis-box p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
            line-height: 1.9;
        }

        .hypothesis-box .note {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-style: italic;
            border-left: 3px solid var(--hypothesis-border);
            padding-left: 1rem;
            margin-top: 1rem;
        }

        /* ===== NEAP TIDE SECTION ===== */
        .neap-section {
            background: var(--neap-light);
            border: 1px solid var(--neap-border);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .neap-section .section-title {
            font-weight: 600;
            font-size: 1rem;
            color: var(--neap-teal);
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* ===== DATA TABLE ===== */
        .data-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.85rem;
            margin-bottom: 1rem;
        }

        .data-table th {
            background: var(--bg-secondary);
            padding: 0.6rem 0.5rem;
            text-align: center;
            font-weight: 600;
            border-bottom: 2px solid var(--border);
            font-size: 0.75rem;
        }

        .data-table td {
            padding: 0.6rem 0.5rem;
            text-align: center;
            border-bottom: 1px solid var(--border);
        }

        .data-table tr:last-child td {
            border-bottom: none;
        }

        .data-table .neap-badge {
            display: inline-block;
            background: var(--neap-teal);
            color: white;
            font-size: 0.65rem;
            padding: 0.15rem 0.4rem;
            border-radius: 3px;
            font-weight: 500;
        }

        .data-table .highlight-row {
            background: rgba(13, 148, 136, 0.08);
        }

        /* ===== INTEGRATION SECTION ===== */
        .integration-section {
            background: linear-gradient(135deg, #faf5ff 0%, #f0fdfa 100%);
            border: 1px solid #d8b4fe;
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .integration-section .section-title {
            font-weight: 600;
            font-size: 1rem;
            color: var(--spawning-purple);
            margin-bottom: 1rem;
        }

        .integration-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        @media (max-width: 600px) {
            .integration-grid { grid-template-columns: 1fr; }
        }

        .integration-card {
            background: white;
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 1rem;
            text-align: center;
        }

        .integration-card .phase-label {
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            color: var(--text-muted);
            margin-bottom: 0.25rem;
        }

        .integration-card .phase-name {
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 0.5rem;
        }

        .integration-card .phase-detail {
            font-size: 0.8rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .integration-insight {
            background: rgba(139, 92, 246, 0.1);
            border-left: 3px solid var(--spawning-purple);
            padding: 1rem 1.25rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-radius: 0 4px 4px 0;
            line-height: 1.8;
        }

        .integration-insight strong {
            color: var(--spawning-purple);
        }

        /* Question-Answer format */
        .qa-block {
            margin-bottom: 1.5rem;
        }

        .qa-question {
            font-weight: 600;
            font-size: 1rem;
            color: var(--spawning-purple);
            margin-bottom: 0.5rem;
        }

        .qa-answer {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.9;
            padding-left: 1rem;
            border-left: 3px solid var(--spawning-border);
        }

        /* ===== HIERARCHY SECTION ===== */
        .hierarchy-intro {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            line-height: 1.9;
        }

        .hierarchy-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
            margin-bottom: 1.5rem;
        }

        @media (max-width: 768px) {
            .hierarchy-grid { grid-template-columns: 1fr; }
        }

        .hierarchy-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1.25rem;
            text-align: center;
            box-shadow: var(--shadow);
            position: relative;
        }

        .hierarchy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            border-radius: 8px 8px 0 0;
        }

        .hierarchy-card.season::before { background: var(--accent-warm); }
        .hierarchy-card.lunar::before { background: var(--neap-teal); }
        .hierarchy-card.daily::before { background: var(--accent-green); }

        .hierarchy-scale {
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 0.5rem;
            opacity: 0.6;
        }

        .hierarchy-question {
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 0.75rem;
            color: var(--text-primary);
        }

        .hierarchy-factors {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin-bottom: 0.75rem;
            line-height: 1.5;
        }

        .hierarchy-precision {
            font-size: 0.75rem;
            font-family: 'JetBrains Mono', monospace;
            background: var(--bg-secondary);
            padding: 0.35rem 0.75rem;
            border-radius: 4px;
            display: inline-block;
        }

        .hierarchy-citation {
            font-size: 0.7rem;
            color: var(--text-muted);
            margin-top: 0.75rem;
            font-style: italic;
        }

        /* ===== MOLECULE SECTION ===== */
        .molecule-section {
            background: var(--molecule-light);
            border: 1px solid var(--molecule-border);
            border-radius: 8px;
            padding: 1.5rem;
        }

        .molecule-intro {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            line-height: 1.9;
        }

        .wave-timeline {
            position: relative;
            padding-left: 2rem;
        }

        .wave-timeline::before {
            content: '';
            position: absolute;
            left: 0.5rem;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(180deg, var(--molecule-blue), var(--spawning-purple));
            border-radius: 2px;
        }

        .wave-item {
            position: relative;
            margin-bottom: 1.25rem;
            padding-left: 1rem;
        }

        .wave-item:last-child { margin-bottom: 0; }

        .wave-item::before {
            content: '';
            position: absolute;
            left: -1.5rem;
            top: 0.35rem;
            width: 14px;
            height: 14px;
            background: var(--molecule-blue);
            border-radius: 50%;
            border: 3px solid var(--molecule-light);
        }

        .wave-item.final::before {
            background: var(--spawning-purple);
            width: 18px;
            height: 18px;
            left: -1.6rem;
        }

        .wave-timing {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--molecule-blue);
            margin-bottom: 0.25rem;
            font-family: 'JetBrains Mono', monospace;
        }

        .wave-item.final .wave-timing {
            color: var(--spawning-purple);
        }

        .wave-title {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.25rem;
        }

        .wave-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .wave-tidal {
            font-size: 0.75rem;
            color: var(--neap-teal);
            font-weight: 500;
            margin-top: 0.25rem;
        }

        .molecule-insight {
            background: rgba(59, 130, 246, 0.1);
            border-left: 3px solid var(--molecule-blue);
            padding: 1rem 1.25rem;
            margin-top: 1.5rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-radius: 0 4px 4px 0;
            line-height: 1.8;
        }

        .molecule-insight strong {
            color: var(--molecule-blue);
        }

        /* ===== DISRUPTION SECTION ===== */
        .disruption-section {
            background: var(--disruption-light);
            border: 1px solid var(--disruption-border);
            border-radius: 8px;
            padding: 1.5rem;
        }

        .disruption-intro {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            line-height: 1.9;
        }

        .disruption-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.25rem;
        }

        @media (max-width: 600px) {
            .disruption-grid { grid-template-columns: 1fr; }
        }

        .disruption-card {
            background: white;
            border: 1px solid var(--disruption-border);
            border-radius: 6px;
            padding: 1.25rem;
        }

        .disruption-icon {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }

        .disruption-title {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            color: var(--disruption-red);
        }

        .disruption-stat {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 0.25rem;
            font-family: 'JetBrains Mono', monospace;
        }

        .disruption-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .disruption-warning {
            background: rgba(239, 68, 68, 0.1);
            border-left: 3px solid var(--disruption-red);
            padding: 1rem 1.25rem;
            margin-top: 1.5rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-radius: 0 4px 4px 0;
            line-height: 1.8;
        }

        .disruption-warning strong {
            color: var(--disruption-red);
        }

        /* ===== CALENDAR ===== */
        .calendar-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 0.5rem;
        }

        .calendar-header {
            font-weight: 600;
            font-size: 0.75rem;
            text-align: center;
            padding: 0.5rem;
            color: var(--text-muted);
            background: var(--bg-secondary);
            border-radius: 4px;
        }

        .calendar-day {
            text-align: center;
            padding: 0.5rem 0.25rem;
            border: 1px solid var(--border);
            border-radius: 6px;
            font-size: 0.8rem;
            min-height: 60px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .calendar-day.empty { border: none; background: transparent; }
        .calendar-day.fullmoon { background: #fef3c7; border-color: #fcd34d; }
        .calendar-day.last-quarter { background: var(--neap-light); border-color: var(--neap-border); }
        .calendar-day.spawning-window { background: var(--spawning-light); border-color: var(--spawning-border); }
        .calendar-day.peak { background: var(--spawning-purple); color: white; border-color: var(--spawning-purple); font-weight: 600; }

        .calendar-day .time-hint {
            font-size: 0.6rem;
            margin-top: 0.2rem;
            font-family: 'JetBrains Mono', monospace;
            opacity: 0.8;
        }

        .calendar-day .moon-hint {
            font-size: 0.55rem;
            margin-top: 0.1rem;
            opacity: 0.7;
        }

        .calendar-day.peak .time-hint { color: white; }
        .calendar-day.peak .moon-hint { color: white; }

        /* ===== INTERFACE PLACEHOLDER ===== */
        .interface-placeholder {
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
            border: 2px dashed var(--accent-teal);
            border-radius: 8px;
            padding: 2rem;
            text-align: center;
        }

        .interface-placeholder h3 {
            font-size: 1rem;
            margin-bottom: 0.5rem;
            color: var(--accent-teal);
        }

        .interface-placeholder p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }

        .interface-features {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            justify-content: center;
        }

        .interface-feature {
            background: white;
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 0.4rem 0.75rem;
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        /* ===== INSIGHTS BOX ===== */
        .insights-box {
            background: linear-gradient(135deg, var(--spawning-light) 0%, #fef7ff 100%);
            border: 1px solid var(--spawning-border);
            border-radius: 8px;
            padding: 1.25rem;
        }

        .insights-box .box-title {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--spawning-purple);
        }

        .insights-list {
            list-style: none;
        }

        .insights-list li {
            padding: 0.5rem 0;
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
            border-bottom: 1px solid rgba(139, 92, 246, 0.1);
        }

        .insights-list li:last-child { border-bottom: none; }
        .insights-list .label { font-weight: 600; color: var(--text-primary); }

        /* ===== REFERENCES ===== */
        .source-info {
            font-size: 0.8rem;
            color: var(--text-muted);
            padding: 1.25rem;
            background: var(--bg-secondary);
            border-radius: 6px;
            line-height: 1.8;
        }

        .source-info a { color: var(--accent-teal); text-decoration: none; }
        .source-info a:hover { text-decoration: underline; }
        .source-info ul { margin-top: 0.75rem; padding-left: 1.25rem; }
        .source-info li { margin-bottom: 0.5rem; }

        /* Footer */
        footer {
            max-width: 800px;
            margin: 0 auto;
            padding: 2rem;
            text-align: center;
            font-size: 0.75rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
        }

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

        /* Language toggle */
        [data-lang="ja"] { display: none; }
        body.ja [data-lang="en"] { display: none; }
        body.ja [data-lang="ja"] { display: inline; }
        div[data-lang="ja"], li[data-lang="ja"], p[data-lang="ja"], span.block[data-lang="ja"] { display: none; }
        body.ja div[data-lang="en"], body.ja li[data-lang="en"], body.ja p[data-lang="en"], body.ja span.block[data-lang="en"] { display: none; }
        body.ja div[data-lang="ja"] { display: block; }
        body.ja li[data-lang="ja"] { display: list-item; }
        body.ja p[data-lang="ja"] { display: block; }
        body.ja span.block[data-lang="ja"] { display: block; }

/* Mobile-optimized background images */
@media (max-width: 768px) {
    .hero-section {
        background: linear-gradient(135deg, rgba(5, 30, 45, 0.7), rgba(10, 60, 70, 0.6)), url("../images/bg-spawning-mobile.webp") !important;
        background-size: cover !important;
        background-position: center !important;
    }
}

/* ===== TOGGLE/ACCORDION ===== */
.science-toggle {
    margin-bottom: 1rem;
}

.science-toggle summary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: all 0.2s;
    list-style: none;
}

.science-toggle summary::-webkit-details-marker {
    display: none;
}

.science-toggle summary::before {
    content: '▶';
    font-size: 0.7rem;
    transition: transform 0.2s;
    color: var(--spawning-purple);
}

.science-toggle[open] summary::before {
    transform: rotate(90deg);
}

.science-toggle summary:hover {
    background: var(--bg-secondary);
    border-color: var(--spawning-border);
}

.science-toggle .toggle-content {
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    background: var(--bg-card);
    margin-top: -1px;
}

.science-toggle .toggle-hint {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-left: auto;
}

/* Part dividers */
.part-header {
    margin: 3rem 0 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border);
}

.part-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--spawning-purple);
    margin-bottom: 0.25rem;
}

.part-header .part-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Quick summary box */
.quick-summary {
    background: linear-gradient(135deg, var(--spawning-light) 0%, #f0fdfa 100%);
    border: 1px solid var(--spawning-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.quick-summary .summary-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--spawning-purple);
    margin-bottom: 0.75rem;
}

.quick-summary p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 0.75rem;
}

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

.quick-summary .key-point {
    font-weight: 600;
    color: var(--neap-teal);
}

/* ===== CALENDAR CONTAINER (NEW) ===== */
.calendar-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.calendar-container .calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.calendar-container .calendar-header .cal-cell {
    font-weight: 600;
    font-size: 0.7rem;
    text-align: center;
    padding: 0.5rem 0.25rem;
    color: var(--text-muted);
    background: var(--bg-secondary);
    border-radius: 4px;
}

.calendar-container .calendar-body {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.25rem;
}

.calendar-container .cal-cell {
    text-align: center;
    padding: 0.6rem 0.25rem;
    font-size: 0.85rem;
    border-radius: 4px;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-container .cal-cell.empty {
    background: transparent;
}

.calendar-container .cal-cell.lunar {
    background: #fef3c7;
    font-weight: 500;
}

.calendar-container .cal-cell.primary {
    background: var(--spawning-purple);
    color: white;
    font-weight: 600;
}

.calendar-container .cal-cell.secondary {
    background: var(--spawning-light);
    border: 1px solid var(--spawning-border);
}

.calendar-legend {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.calendar-legend .legend-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.calendar-legend .legend-box {
    width: 16px;
    height: 16px;
    border-radius: 3px;
}

.calendar-legend .legend-box.primary {
    background: var(--spawning-purple);
}

.calendar-legend .legend-box.secondary {
    background: var(--spawning-light);
    border: 1px solid var(--spawning-border);
}

.calendar-legend .legend-box.lunar {
    background: #fef3c7;
}

/* ===== TABLE CONTAINER ===== */
.table-container {
    overflow-x: auto;
    margin-bottom: 1rem;
}

/* ===== GUIDE GRID ===== */
.guide-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
    .guide-grid {
        grid-template-columns: 1fr;
    }
}

.guide-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.guide-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.guide-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.guide-content {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== PHASE TIMELINE ===== */
.phase-timeline {
    position: relative;
    padding-left: 2.5rem;
}

.phase-timeline::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.phase-item {
    position: relative;
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.phase-item:last-child {
    margin-bottom: 0;
}

.phase-item.current .phase-marker {
    background: var(--spawning-purple);
    color: white;
}

.phase-marker {
    position: absolute;
    left: -2rem;
    top: 0;
    width: 28px;
    height: 28px;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.phase-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.25rem;
}

.phase-item.current .phase-content {
    border-color: var(--spawning-border);
    background: var(--spawning-light);
}

.phase-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.phase-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
}

.phase-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== PAGE SWITCHER ===== */
.page-switcher {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--bg-secondary);
    padding: 0.35rem;
    border-radius: 8px;
    width: fit-content;
}

.switcher-tab {
    padding: 0.6rem 1.25rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.switcher-tab:hover {
    background: rgba(139, 92, 246, 0.1);
    color: var(--spawning-purple);
}

.switcher-tab.active {
    background: var(--bg-card);
    color: var(--spawning-purple);
    box-shadow: var(--shadow);
}

/* ===== MECHANISM HERO ===== */
.mechanism-hero {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #0f172a 100%);
    color: white;
    padding: 3rem 2rem;
    border-radius: 12px;
    margin-bottom: 2.5rem;
    text-align: center;
}

.mechanism-hero h1 {
    font-size: 1.8rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 1rem;
}

body.ja .mechanism-hero h1 {
    font-size: 1.5rem;
}

.mechanism-hero .hero-sub {
    font-size: 1rem;
    opacity: 0.85;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ===== PART NUMBER ===== */
.part-number {
    display: inline-block;
    background: var(--spawning-purple);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    margin-right: 0.75rem;
    vertical-align: middle;
}

/* ===== EVIDENCE GRID ===== */
.evidence-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 768px) {
    .evidence-grid {
        grid-template-columns: 1fr;
    }
}

.evidence-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    display: flex;
    gap: 1rem;
}

.evidence-number {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background: var(--neap-teal);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
}

.evidence-content {
    flex: 1;
}

.evidence-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.evidence-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ===== KEY INSIGHT ===== */
.key-insight {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: linear-gradient(135deg, #fef2f2 0%, #fff7ed 100%);
    border: 2px solid #fecaca;
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
}

.insight-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.insight-text {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===== MECHANISM DIAGRAM ===== */
.mechanism-diagram {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.diagram-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.diagram-item {
    text-align: center;
    padding: 1rem;
    border-radius: 8px;
    min-width: 100px;
}

.diagram-item.highlight {
    background: var(--neap-light);
    border: 1px solid var(--neap-border);
}

.diagram-item.spawning {
    background: var(--spawning-light);
    border: 1px solid var(--spawning-border);
}

.diagram-icon {
    font-size: 1.5rem;
    margin-bottom: 0.35rem;
}

.diagram-label {
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

.diagram-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.diagram-arrow {
    font-size: 1.25rem;
    color: var(--text-muted);
}

/* ===== COMPARISON GRID ===== */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 600px) {
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

.comparison-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
}

.comparison-title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.comparison-window {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.comparison-result {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--neap-teal);
}

/* ===== ADVANTAGE GRID ===== */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 600px) {
    .advantage-grid {
        grid-template-columns: 1fr;
    }
}

.advantage-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
}

.advantage-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.advantage-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.advantage-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ===== THREAT GRID ===== */
.threat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 768px) {
    .threat-grid {
        grid-template-columns: 1fr;
    }
}

.threat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.threat-card.critical {
    border-color: #fecaca;
    background: #fef2f2;
}

.threat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.threat-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.threat-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

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

.threat-card p.source {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* ===== WARNING BOX ===== */
.warning-box {
    background: rgba(239, 68, 68, 0.1);
    border-left: 3px solid #ef4444;
    padding: 1rem 1.25rem;
    border-radius: 0 6px 6px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.warning-box strong {
    color: #dc2626;
}

/* ===== CTA BUTTON ===== */
.cta-button {
    display: inline-block;
    background: var(--spawning-purple);
    color: white;
    padding: 0.85rem 1.75rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.cta-button:hover {
    background: #7c3aed;
    transform: translateY(-1px);
}

/* ===== SOURCE CLASS ===== */
p.source {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* ===== DISCOVERY CARD ===== */
.discovery-card {
    display: flex;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.discovery-year {
    flex-shrink: 0;
    background: var(--neap-teal);
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    height: fit-content;
}

.discovery-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.discovery-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.discovery-content p.source {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
}

/* ===== WAVE CONTENT (update) ===== */
.wave-content {
    flex: 1;
}

.wave-content .wave-title {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.wave-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}