/* ========================================
           PROFESSIONAL MATERIAL DATABASE UI
           Based on calculator.html design system
        ======================================== */

        /* Base Reset & Typography */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            /* Color System - White & Dark Gray Theme */
            --color-primary: #2C2C2C;
            --color-primary-dark: #1A1A1A;
            --color-primary-light: #404040;
            --color-bg-base: #FFFFFF;
            --color-bg-white: #FFFFFF;
            --color-bg-subtle: #F3F4F6;
            --color-bg-card: #F8F9FA;
            --color-border: #D0D0D0;
            --color-border-light: #E5E5E5;
            --color-border-hover: #BBBBBB;
            --color-text-primary: #1A1A1A;
            --color-text-secondary: #555555;
            --color-text-subtle: #888888;
            --color-shadow-sm: rgba(0, 0, 0, 0.06);
            --color-shadow-md: rgba(0, 0, 0, 0.10);
            --color-shadow-lg: rgba(0, 0, 0, 0.14);
            --color-success: #00875A;
            --color-warning: #FFA726;
            --color-error: #DE350B;

            /* Spacing Scale */
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;

            /* Typography Scale */
            --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --font-size-xs: 11px;
            --font-size-sm: 13px;
            --font-size-base: 14px;
            --font-size-md: 16px;
            --font-size-lg: 18px;
            --font-size-xl: 24px;
            --font-size-2xl: 32px;
            --font-weight-normal: 400;
            --font-weight-medium: 500;
            --font-weight-semibold: 600;
            --font-weight-bold: 700;

            /* Layout */
            --border-radius-sm: 6px;
            --border-radius-md: 8px;
            --border-radius-lg: 12px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --container-max: 1350px;
            --card-gap: 20px;
        }

        body {
            font-family: var(--font-family);
            background: var(--color-bg-base);
            color: var(--color-text-primary);
            line-height: 1.6;
            font-size: var(--font-size-base);
            padding-top: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
            overflow-x: hidden;
        }

        /* 左固定バナー:
           - 一覧ページ(.page-layout内): 絞り込み条件の左に sticky 配置、サイドバーと共にスクロール追従
           - 詳細ページ: absolute でページと一緒にスクロール（フッダ到達前に画面外へ消える） */
        .left-fixed-banner {
            position: fixed;
            left: calc(50% - 675px - 195px);
            top: 250px;
            z-index: 100;
            width: 195px;
        }

        /* 詳細ページ: fixedではなくabsoluteにしてコンテンツと一緒にスクロール */
        body.detail-page .left-fixed-banner {
            position: absolute;
        }

        /* 一覧ページ: フッダがバナーの上に来るよう stacking context を作る */
        footer {
            position: relative;
            z-index: 200;
        }

        .left-fixed-banner a {
            display: block;
            transition: opacity 0.2s;
        }

        .left-fixed-banner a:hover {
            opacity: 0.85;
        }

        .left-fixed-banner img {
            width: 195px;
            max-height: calc(100vh - 290px);
            height: auto;
            object-fit: contain;
            object-position: top;
            display: block;
        }

        /* 一覧ページ用: .page-layout 直下の .left-fixed-banner は sticky 扱い。
           幅0コンテナ + margin-right: -gap で flex gap を相殺し、サイドバー/本文の位置を変えない */
        .page-layout > .left-fixed-banner {
            position: sticky;
            top: 20px;
            left: auto;
            width: 0;
            flex-shrink: 0;
            align-self: flex-start;
            margin-right: calc(var(--space-xl) * -1);
            z-index: 50;
        }

        .page-layout > .left-fixed-banner > a {
            position: absolute;
            right: 20px;   /* 絞り込み条件との余白 */
            top: 0;
            width: 195px;
        }

        .page-layout > .left-fixed-banner img {
            width: 195px;
            max-height: calc(100vh - 60px);
        }

        /* 幅が足りない場合は非表示 (一覧・詳細どちらも) */
        @media (max-width: 1779px) {
            .left-fixed-banner {
                display: none;
            }
        }

        /* フェードインアニメーション */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ========================================
           MAIN CONTAINER
        ======================================== */
        main {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 15px var(--space-xl) var(--space-3xl);
        }

        /* ========================================
           PAGE HEADER
        ======================================== */
        .page-header {
            margin-bottom: var(--space-2xl);
            text-align: left;
            padding: 0;
        }

        .breadcrumb {
            font-size: var(--font-size-sm);
            color: var(--color-text-subtle);
            margin-bottom: 25px;
        }

        .breadcrumb a {
            color: var(--color-text-subtle);
            text-decoration: none;
            transition: color 0.15s ease;
        }

        .breadcrumb a:hover {
            color: var(--color-text-primary);
            text-decoration: underline;
        }

        .breadcrumb .separator {
            margin: 0 6px;
        }

        .page-title {
            font-size: var(--font-size-2xl);
            font-weight: var(--font-weight-bold);
            color: var(--color-text-primary);
            margin-bottom: 10px;
            letter-spacing: -0.8px;
            line-height: 1.2;
        }

        .page-subtitle {
            font-size: var(--font-size-md);
            color: var(--color-text-secondary);
            font-weight: var(--font-weight-normal);
            line-height: 1.6;
            max-width: 100%;
            white-space: normal;
        }

        /* ========================================
           DISCLAIMER BANNER
        ======================================== */
        .disclaimer-banner {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin: 0 auto 24px;
            max-width: 1700px;
            width: 100%;
            box-sizing: border-box;
        }

        .disclaimer-icon {
            flex-shrink: 0;
            color: #c00;
            margin-top: 1px;
        }

        .disclaimer-content {
            font-size: 14px;
            line-height: 1.6;
            color: #c00;
        }

        .disclaimer-content strong {
            color: #c00;
        }

        /* ========================================
           SEARCH SECTION
        ======================================== */
        .search-section {
            background: var(--color-bg-card);
            padding: 20px;
            border-radius: var(--border-radius-lg);
            border: 1px solid var(--color-border-light);
            max-width: var(--container-max);
            width: 100%;
            margin-left: auto;
            margin-right: auto;
            margin-bottom: var(--space-2xl);
            box-sizing: border-box;
        }

        .search-wrapper {
            position: relative;
            display: flex;
            align-items: center;
            width: 100%;
        }

        .search-icon {
            position: absolute;
            left: 20px;
            width: 18px;
            height: 18px;
            stroke: var(--color-text-subtle);
            fill: none;
            stroke-width: 2;
            pointer-events: none;
        }

        .search-input {
            width: 100%;
            padding: 16px 20px 16px 52px;
            font-size: var(--font-size-base);
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-md);
            outline: none;
            transition: all var(--transition-base);
            font-family: var(--font-family);
            background: var(--color-bg-white);
        }

        .search-input:hover {
            border-color: var(--color-border-hover);
        }

        .search-input:focus {
            border-color: var(--color-primary);
            background: var(--color-bg-white);
            box-shadow: 0 0 0 3px rgba(0, 94, 158, 0.08);
        }

        .search-input::placeholder {
            color: var(--color-text-subtle);
        }

        /* ========================================
           FILTER BAR - Large Button Style
        ======================================== */
        .filter-bar {
            margin-bottom: var(--space-3xl);
        }

        .filter-section-title {
            font-size: var(--font-size-md);
            font-weight: var(--font-weight-semibold);
            color: var(--color-text-primary);
            margin-bottom: var(--space-md);
        }

        /* ========================================
           SIDEBAR + MAIN CONTENT LAYOUT
        ======================================== */
        .page-layout {
            display: flex;
            gap: var(--space-xl);
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0;
            align-items: start;
        }

        .sidebar-filters {
            width: 280px;
            flex-shrink: 0;
            position: sticky;
            top: 20px;
            height: fit-content;
        }

        .main-content {
            flex: 1;
            min-width: 0;
            overflow-x: hidden;
            position: relative;
        }
        .main-content::after {
            display: none;
        }

        /* ========================================
           FACET FILTER PANEL (SIDEBAR VERSION)
        ======================================== */
        .facet-filter-container {
            background: var(--color-bg-white);
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-lg);
            overflow: hidden;
        }

        .facet-filter-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 16px;
            background: var(--color-bg-subtle);
            border-bottom: 1px solid var(--color-border-light);
        }

        .facet-filter-title {
            font-size: var(--font-size-base);
            font-weight: var(--font-weight-bold);
            color: var(--color-text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .facet-filter-title svg {
            width: 18px;
            height: 18px;
            stroke: var(--color-primary);
            fill: none;
            stroke-width: 2;
        }

        .facet-clear-all {
            padding: 5px 12px;
            background: transparent;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-xs);
            color: var(--color-text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .facet-clear-all:hover {
            border-color: var(--color-error);
            color: var(--color-error);
        }

        /* サイドバー用: 縦に積む形式 */
        .facet-columns {
            display: flex;
            flex-direction: column;
        }

        .facet-column {
            padding: 14px 16px;
            border-bottom: 1px solid var(--color-border-light);
        }

        .facet-column:last-child {
            border-bottom: none;
        }

        .facet-column-title {
            font-size: 12px;
            font-weight: var(--font-weight-bold);
            color: var(--color-text-primary);
            margin-bottom: 10px;
            padding-bottom: 6px;
            border-bottom: 2px solid var(--color-primary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .facet-column-title svg {
            width: 13px;
            height: 13px;
            stroke: var(--color-primary);
            fill: none;
            stroke-width: 2;
        }

        .facet-options {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .facet-option {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 6px 8px;
            border-radius: var(--border-radius-sm);
            cursor: pointer;
            transition: all var(--transition-fast);
            font-size: 12px;
            color: var(--color-text-primary);
        }

        .facet-option:hover {
            background: var(--color-bg-subtle);
        }

        .facet-option.active {
            background: rgba(0, 102, 204, 0.1);
            color: var(--color-primary);
            font-weight: var(--font-weight-semibold);
        }

        .facet-checkbox {
            width: 14px;
            height: 14px;
            border: 2px solid var(--color-border);
            border-radius: 3px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: all var(--transition-fast);
        }

        .facet-option.active .facet-checkbox {
            background: var(--color-primary);
            border-color: var(--color-primary);
        }

        .facet-checkbox svg {
            width: 9px;
            height: 9px;
            stroke: white;
            stroke-width: 3;
            fill: none;
            opacity: 0;
        }

        .facet-option.active .facet-checkbox svg {
            opacity: 1;
        }

        .facet-radio {
            width: 14px;
            height: 14px;
            border: 2px solid var(--color-border);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: all var(--transition-fast);
        }

        .facet-option.active .facet-radio {
            border-color: var(--color-primary);
        }

        .facet-radio-inner {
            width: 6px;
            height: 6px;
            background: var(--color-primary);
            border-radius: 50%;
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .facet-option.active .facet-radio-inner {
            opacity: 1;
        }

        .facet-select {
            width: 100%;
            padding: 6px 8px;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-sm);
            font-size: 12px;
            font-family: var(--font-family);
            background: var(--color-bg-white);
            color: var(--color-text-primary);
            cursor: pointer;
            margin-bottom: 6px;
        }

        .facet-select:focus {
            outline: none;
            border-color: var(--color-primary);
        }

        .facet-select.has-value {
            border-color: var(--color-primary);
            background: rgba(0, 102, 204, 0.05);
        }

        /* レスポンシブ: タブレット以下でサイドバーを非表示にして上部に表示 */
        @media (max-width: 1024px) {
            .page-layout {
                flex-direction: column;
            }

            .sidebar-filters {
                width: 100%;
                position: static;
                max-height: none;
                overflow: visible;
                margin-bottom: var(--space-lg);
            }

            .facet-columns {
                display: grid;
                grid-template-columns: repeat(3, 1fr);
            }

            .facet-column {
                border-bottom: none;
                border-right: 1px solid var(--color-border-light);
            }

            .facet-column:last-child {
                border-right: none;
            }
        }

        @media (max-width: 768px) {
            .facet-columns {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .facet-columns {
                grid-template-columns: 1fr;
            }

            .facet-column {
                border-right: none;
                border-bottom: 1px solid var(--color-border-light);
            }
        }

        /* Quick filter row */
        .facet-quick-row {
            display: flex;
            gap: 8px;
            padding: 12px 16px;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-top: 1px solid var(--color-border-light);
            flex-wrap: wrap;
        }

        .facet-quick-btn {
            padding: 6px 14px;
            background: var(--color-bg-white);
            border: 1px solid var(--color-border);
            border-radius: 16px;
            font-size: 12px;
            color: var(--color-text-primary);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .facet-quick-btn:hover {
            border-color: var(--color-primary);
            background: var(--color-bg-white);
            transform: translateY(-1px);
        }

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

        .facet-quick-btn svg {
            width: 12px;
            height: 12px;
            stroke: currentColor;
            fill: none;
            stroke-width: 2;
        }

        .category-filters {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: var(--space-md);
            margin-bottom: var(--space-lg);
        }

        .category-filter-btn {
            padding: var(--space-lg) var(--space-md);
            background: var(--color-bg-white);
            border: 2px solid var(--color-border);
            border-radius: var(--border-radius-md);
            font-size: var(--font-size-md);
            font-weight: var(--font-weight-semibold);
            color: var(--color-text-primary);
            cursor: pointer;
            transition: all var(--transition-base);
            text-align: center;
            font-family: var(--font-family);
        }

        .category-filter-btn:hover {
            border-color: var(--color-primary);
            background: var(--color-bg-subtle);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px var(--color-shadow-md);
        }

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

        .category-filter-btn.active:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
        }

        .filter-info-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--space-md);
            background: var(--color-bg-subtle);
            border-radius: var(--border-radius-md);
            flex-wrap: wrap;
            gap: var(--space-md);
            margin-bottom: var(--card-gap);
        }

        .comparison-controls {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .active-filters {
            display: flex;
            gap: var(--space-sm);
            align-items: center;
            flex-wrap: wrap;
        }

        .filter-tag {
            display: inline-flex;
            align-items: center;
            gap: var(--space-xs);
            padding: 6px 12px;
            background: var(--color-primary);
            color: white;
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-sm);
            font-weight: var(--font-weight-semibold);
        }

        .filter-tag button {
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 0;
            margin-left: var(--space-xs);
            font-size: 16px;
            line-height: 1;
        }

        .result-count {
            font-size: var(--font-size-md);
            color: var(--color-text-primary);
            font-weight: var(--font-weight-semibold);
        }

        /* ========================================
           SEARCH MATCH TOOLTIP
        ======================================== */
        .material-card {
            position: relative;
        }

        .match-tooltip {
            position: absolute;
            top: 0;
            left: 100%;
            margin-left: 12px;
            transform: translateY(0);
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            color: #fff;
            padding: 12px 16px;
            border-radius: 10px;
            font-size: 12px;
            line-height: 1.5;
            min-width: 280px;
            max-width: 400px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 2px 8px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
            z-index: 9999;
            pointer-events: none;
        }

        .material-card:hover {
            z-index: 100;
        }

        .match-tooltip::after {
            content: '';
            position: absolute;
            top: 20px;
            left: -8px;
            border-width: 8px 8px 8px 0;
            border-style: solid;
            border-color: transparent #1a1a2e transparent transparent;
        }

        .material-card:hover .match-tooltip {
            opacity: 1;
            visibility: visible;
            transform: translateX(4px);
        }

        .match-tooltip-header {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 10px;
            padding-bottom: 8px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.15);
            font-weight: 600;
            color: #4fc3f7;
        }

        .match-tooltip-header svg {
            width: 14px;
            height: 14px;
            stroke: #4fc3f7;
            fill: none;
            stroke-width: 2;
        }

        .match-item {
            display: flex;
            margin-bottom: 6px;
            align-items: flex-start;
        }

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

        .match-field {
            background: rgba(79, 195, 247, 0.2);
            color: #4fc3f7;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 10px;
            font-weight: 600;
            margin-right: 8px;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .match-value {
            color: #e0e0e0;
            font-size: 11px;
            word-break: break-word;
        }

        .match-value mark {
            background: rgba(255, 235, 59, 0.3);
            color: #ffeb3b;
            padding: 0 2px;
            border-radius: 2px;
        }

        /* ========================================
           ADVANCED FILTER PANEL
        ======================================== */
        .advanced-filter-toggle {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 12px 20px;
            background: var(--color-bg-white);
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-md);
            font-size: var(--font-size-base);
            font-weight: var(--font-weight-semibold);
            color: var(--color-text-primary);
            cursor: pointer;
            transition: all var(--transition-base);
            margin-bottom: var(--space-lg);
        }

        .advanced-filter-toggle:hover {
            border-color: var(--color-primary);
            background: var(--color-bg-subtle);
        }

        .advanced-filter-toggle.active {
            border-color: var(--color-primary);
            background: var(--color-bg-subtle);
        }

        .advanced-filter-toggle svg {
            width: 18px;
            height: 18px;
            stroke: currentColor;
            fill: none;
            stroke-width: 2;
            transition: transform 0.2s ease;
        }

        .advanced-filter-toggle.active svg {
            transform: rotate(180deg);
        }

        .advanced-filter-panel {
            display: none;
            background: var(--color-bg-white);
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-lg);
            padding: var(--space-xl);
            margin-bottom: var(--space-xl);
        }

        .advanced-filter-panel.open {
            display: block;
        }

        .filter-group {
            margin-bottom: var(--space-xl);
        }

        .filter-group:last-child {
            margin-bottom: 0;
        }

        .filter-group-title {
            font-size: var(--font-size-base);
            font-weight: var(--font-weight-bold);
            color: var(--color-text-primary);
            margin-bottom: var(--space-md);
            padding-bottom: var(--space-sm);
            border-bottom: 1px solid var(--color-border-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .filter-group-title svg {
            width: 16px;
            height: 16px;
            stroke: var(--color-text-secondary);
            fill: none;
            stroke-width: 2;
        }

        .filter-options {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .filter-chip {
            padding: 8px 16px;
            background: var(--color-bg-subtle);
            border: 1px solid var(--color-border);
            border-radius: 20px;
            font-size: var(--font-size-sm);
            color: var(--color-text-primary);
            cursor: pointer;
            transition: all var(--transition-fast);
            user-select: none;
        }

        .filter-chip:hover {
            border-color: var(--color-primary);
            background: var(--color-bg-white);
        }

        .filter-chip.active {
            background: var(--color-primary);
            color: white;
            border-color: var(--color-primary);
        }

        .filter-range-group {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--space-md);
        }

        .filter-range-item {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .filter-range-label {
            font-size: var(--font-size-sm);
            color: var(--color-text-secondary);
        }

        .filter-range-select {
            padding: 10px 14px;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-base);
            font-family: var(--font-family);
            background: var(--color-bg-white);
            color: var(--color-text-primary);
            cursor: pointer;
        }

        .filter-range-select:focus {
            outline: none;
            border-color: var(--color-primary);
        }

        .quick-filter-section {
            margin-bottom: var(--space-xl);
        }

        .quick-filter-title {
            font-size: var(--font-size-sm);
            font-weight: var(--font-weight-semibold);
            color: var(--color-text-secondary);
            margin-bottom: var(--space-sm);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .quick-filters {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .quick-filter-btn {
            padding: 10px 16px;
            background: var(--color-bg-white);
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-sm);
            color: var(--color-text-primary);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .quick-filter-btn:hover {
            border-color: var(--color-primary);
            background: var(--color-bg-subtle);
        }

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

        .quick-filter-btn svg {
            width: 14px;
            height: 14px;
            stroke: currentColor;
            fill: none;
            stroke-width: 2;
        }

        .filter-actions {
            display: flex;
            gap: var(--space-md);
            padding-top: var(--space-lg);
            border-top: 1px solid var(--color-border-light);
            margin-top: var(--space-lg);
        }

        .filter-clear-btn {
            padding: 10px 20px;
            background: transparent;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-sm);
            color: var(--color-text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .filter-clear-btn:hover {
            border-color: var(--color-error);
            color: var(--color-error);
        }

        /* ========================================
           MATERIAL GRID
        ======================================== */
        .material-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: var(--card-gap);
        }

        .material-card {
            background: #FFFFFF;
            border: 1px solid var(--color-border-light);
            border-radius: var(--border-radius-md);
            padding: var(--space-xl);
            cursor: pointer;
            transition: all var(--transition-base);
            position: relative;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .material-card:hover {
            border-color: var(--color-primary);
            box-shadow: 0 2px 12px var(--color-shadow-md);
            transform: translateY(-2px);
            background: var(--color-bg-card);
        }

        .material-header {
            display: flex;
            flex-direction: column;
            gap: var(--space-xs);
            margin-bottom: var(--space-md);
        }

        .material-name {
            font-size: var(--font-size-lg);
            font-weight: var(--font-weight-bold);
            color: var(--color-text-primary);
        }

        .material-tags {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-xs);
        }

        .category-badge {
            display: inline-block;
            padding: 3px 8px;
            background: var(--color-bg-subtle);
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-xs);
            font-weight: var(--font-weight-semibold);
            color: var(--color-text-secondary);
            white-space: nowrap;
        }

        .material-aliases {
            font-size: var(--font-size-xs);
            color: var(--color-text-subtle);
            font-style: normal;
        }

        .material-props {
            display: grid;
            gap: var(--space-sm);
            margin-bottom: var(--space-md);
        }

        .prop-row {
            display: flex;
            justify-content: space-between;
            font-size: var(--font-size-sm);
            padding: var(--space-sm) 0;
            border-bottom: 1px solid var(--color-border-light);
        }

        .prop-label {
            color: var(--color-text-secondary);
        }

        .prop-value {
            color: var(--color-text-primary);
            font-weight: var(--font-weight-medium);
            font-variant-numeric: tabular-nums;
        }

        .material-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: auto;
            padding-top: var(--space-md);
        }

        .updated-date {
            font-size: var(--font-size-xs);
            color: var(--color-text-subtle);
        }

        .view-details-btn {
            padding: 6px 14px;
            background: var(--color-primary);
            color: white;
            border: none;
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-sm);
            font-weight: var(--font-weight-semibold);
            cursor: pointer;
            transition: all var(--transition-base);
        }

        .view-details-btn:hover {
            background: var(--color-primary-dark);
            transform: translateY(-1px);
        }

        /* ========================================
           MODAL STYLES
        ======================================== */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0);
            display: flex;
            align-items: flex-start;
            justify-content: center;
            z-index: 99999;
            padding: 40px 20px 20px;
            overflow-y: auto;
            animation: modalOverlayFadeIn 0.3s ease forwards;
        }

        @keyframes modalOverlayFadeIn {
            from {
                background: rgba(0, 0, 0, 0);
            }
            to {
                background: rgba(0, 0, 0, 0.6);
            }
        }

        .modal-content {
            background: white;
            border-radius: 12px;
            max-width: 600px;
            width: 100%;
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            animation: modalContentSlideIn 0.3s ease forwards;
            opacity: 0;
            transform: translateY(-30px) scale(0.95);
        }

        @keyframes modalContentSlideIn {
            from {
                opacity: 0;
                transform: translateY(-30px) scale(0.95);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .modal-content.modal-wide {
            max-width: 900px;
        }

        /* 比較モーダル用（代替材料モーダルの上に表示） */
        .modal-overlay.comparison-overlay {
            z-index: 100000;
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            border-bottom: 1px solid #e0e0e0;
            position: sticky;
            top: 0;
            background: white;
            z-index: 10;
        }

        .modal-header h2 {
            margin: 0;
            font-size: 18px;
            font-weight: 600;
            color: #1A1A1A;
        }

        .modal-close {
            background: none;
            border: none;
            font-size: 28px;
            color: #666;
            cursor: pointer;
            padding: 0;
            line-height: 1;
        }

        .modal-close:hover {
            color: #1A1A1A;
        }

        .modal-body {
            padding: 24px;
        }

        .alternatives-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .alternative-item {
            background: #f8f9fa;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            padding: 16px;
        }

        .alternative-item.different-category {
            border: 2px solid #f0ad4e;
            background: #fffdf5;
        }

        .category-warning {
            display: flex;
            align-items: center;
            gap: 8px;
            background: #fff3cd;
            color: #856404;
            padding: 8px 12px;
            border-radius: 6px;
            margin-bottom: 12px;
            font-size: 13px;
            font-weight: 500;
        }

        .category-warning .warning-icon {
            font-size: 16px;
        }

        .alternative-category-badge {
            font-size: 11px;
            color: #555;
            background: #e0e0e0;
            padding: 2px 8px;
            border-radius: 4px;
            margin-left: 10px;
        }

        .reasons-label {
            font-size: 12px;
            color: #666;
            font-weight: 500;
            margin-right: 4px;
        }

        .alternative-detailed-reasons {
            background: #fff;
            border: 1px solid #e0e0e0;
            border-radius: 6px;
            padding: 10px 12px;
            margin-bottom: 12px;
        }

        .detailed-reason {
            font-size: 12px;
            color: #444;
            line-height: 1.6;
            padding: 2px 0;
        }

        .detailed-reason::before {
            content: "• ";
            color: #0066cc;
        }

        .alternative-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
        }

        .alternative-name {
            font-weight: 600;
            font-size: 16px;
            color: #1A1A1A;
        }

        .alternative-score {
            font-size: 12px;
            color: #666;
            background: #e8e8e8;
            padding: 2px 8px;
            border-radius: 4px;
            margin-left: 10px;
        }

        .alternative-reasons {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 10px;
        }

        .reason-tag {
            font-size: 11px;
            color: #0066cc;
            background: #e6f0ff;
            padding: 2px 8px;
            border-radius: 4px;
        }

        .alternative-props {
            font-size: 13px;
            color: #666;
            margin-bottom: 12px;
        }

        .alternative-props span {
            margin-right: 16px;
        }

        .btn-compare {
            background: transparent;
            border: 1px solid #2C2C2C;
            color: #2C2C2C;
            padding: 6px 12px;
            border-radius: 4px;
            font-size: 12px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-compare:hover {
            background: #2C2C2C;
            color: white;
        }

        .btn-view-detail {
            background: #2C2C2C;
            border: none;
            color: white;
            padding: 8px 16px;
            border-radius: 4px;
            font-size: 13px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-view-detail:hover {
            background: #1A1A1A;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 24px;
        }

        .comparison-table th,
        .comparison-table td {
            padding: 12px 16px;
            text-align: left;
            border-bottom: 1px solid #e0e0e0;
        }

        .comparison-table th {
            background: #f8f9fa;
            font-weight: 600;
            font-size: 13px;
        }

        .comparison-table td {
            font-size: 14px;
        }

        .comparison-table th:first-child,
        .comparison-table td:first-child {
            width: 120px;
            color: #666;
        }

        .comparison-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .feature-column {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 16px;
        }

        .feature-column h4 {
            margin: 0 0 12px 0;
            font-size: 14px;
            font-weight: 600;
            color: #1A1A1A;
        }

        .feature-column ul {
            margin: 0;
            padding-left: 18px;
            font-size: 13px;
            line-height: 1.7;
            color: #444;
        }

        .btn-find-alternatives {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            border: 2px solid #FFFFFF;
            color: #FFFFFF;
            padding: 10px 20px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
            margin-top: 16px;
        }

        .btn-find-alternatives:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #FFFFFF;
        }

        .btn-find-alternatives svg {
            width: 18px;
            height: 18px;
            stroke: currentColor;
            stroke-width: 2;
            fill: none;
        }

        /* ========================================
           COMPARISON BAR & MODE
        ======================================== */
        .btn-toggle-compare {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 1px solid #ccc;
            color: #333;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-toggle-compare:hover {
            background: #222;
            border-color: #222;
            color: #fff;
        }

        .btn-toggle-compare svg {
            width: 16px;
            height: 16px;
            stroke: currentColor;
            stroke-width: 2;
            fill: none;
        }

        .comparison-count {
            font-size: 13px;
            font-weight: 600;
            color: #2C2C2C;
        }

        .comparison-hint {
            font-size: 13px;
            color: #666;
        }

        .comparison-selected {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .selected-material {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #e6f0ff;
            color: #0066cc;
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 12px;
        }

        .selected-material button {
            background: none;
            border: none;
            color: #0066cc;
            font-size: 14px;
            cursor: pointer;
            padding: 0;
            line-height: 1;
        }

        .selected-material button:hover {
            color: #004499;
        }

        .btn-show-comparison {
            background: #0066cc;
            border: none;
            color: white;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-show-comparison:hover:not(:disabled) {
            background: #0052a3;
        }

        .btn-show-comparison:disabled {
            background: #ccc;
            cursor: not-allowed;
        }

        .btn-clear-comparison {
            background: transparent;
            border: 1px solid #999;
            color: #666;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 13px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-clear-comparison:hover {
            border-color: #DE350B;
            color: #DE350B;
        }

        /* Material card in comparison mode */
        .material-card.comparison-mode {
            position: relative;
            padding-left: 50px;
        }

        .material-card.comparison-selected {
            border-color: #0066cc;
            background: #f0f7ff;
        }

        /* 最大選択数アラート */
        .max-selection-alert {
            position: fixed;
            top: 100px;
            left: 50%;
            transform: translateX(-50%);
            background: #DE350B;
            color: white;
            padding: 12px 24px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            z-index: 2000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            animation: alertSlideIn 0.3s ease;
        }

        .max-selection-alert.fade-out {
            opacity: 0;
            transform: translateX(-50%) translateY(-10px);
            transition: all 0.3s ease;
        }

        @keyframes alertSlideIn {
            from {
                opacity: 0;
                transform: translateX(-50%) translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateX(-50%) translateY(0);
            }
        }

        .comparison-checkbox {
            position: absolute;
            left: 12px;
            top: 12px;
            width: 24px;
            height: 24px;
            border: 2px solid #ccc;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
            background: white;
            z-index: 1;
        }

        .comparison-checkbox:hover {
            border-color: #0066cc;
        }

        .comparison-checkbox.checked {
            background: #0066cc;
            border-color: #0066cc;
        }

        .comparison-checkbox svg {
            width: 16px;
            height: 16px;
            stroke: white;
            stroke-width: 3;
            fill: none;
        }

        /* Multi-comparison modal */
        .modal-content.modal-extra-wide {
            max-width: 1133px;
        }

        .multi-comparison-table-wrapper {
            overflow-x: auto;
            margin-bottom: 16px;
        }

        .multi-comparison-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }

        .multi-comparison-table th,
        .multi-comparison-table td {
            padding: 12px 16px;
            text-align: center;
            border: 1px solid #e0e0e0;
            white-space: nowrap;
        }

        .multi-comparison-table th {
            background: #f8f9fa;
            font-weight: 600;
            font-size: 13px;
            position: sticky;
            top: 0;
            text-align: center;
        }

        .multi-comparison-table td {
            font-size: 14px;
            text-align: center;
        }

        .multi-comparison-table .sticky-col {
            position: sticky;
            left: 0;
            background: #f8f9fa;
            z-index: 1;
            min-width: 140px;
            font-weight: 500;
            color: #666;
            text-align: left;
        }

        .multi-comparison-table tbody .sticky-col {
            background: white;
        }

        /* 比較項目フィルターパネル */
        .comparison-filter-panel {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 12px 16px;
            margin-bottom: 16px;
        }

        .comparison-filter-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
        }

        .comparison-filter-label {
            font-size: 14px;
            font-weight: 600;
            color: #1A1A1A;
        }

        .btn-filter-toggle {
            background: none;
            border: none;
            padding: 4px;
            cursor: pointer;
            color: #666;
            transition: transform 0.2s ease;
        }

        .btn-filter-toggle.open {
            transform: rotate(180deg);
        }

        .comparison-filter-options {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 16px;
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid #e0e0e0;
        }

        .comparison-filter-options.closed {
            display: none;
        }

        .comparison-filter-checkbox {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: #333;
            cursor: pointer;
            user-select: none;
        }

        .comparison-filter-checkbox input[type="checkbox"] {
            width: 16px;
            height: 16px;
            accent-color: #2563eb;
            cursor: pointer;
        }

        .comparison-filter-checkbox span {
            white-space: nowrap;
        }

        /* 比較テーブル内のリスト表示 */
        .comparison-list {
            margin: 0;
            padding-left: 16px;
            text-align: left;
            font-size: 12px;
            line-height: 1.6;
        }

        .comparison-list li {
            margin-bottom: 4px;
        }

        .comparison-list li:last-child {
            margin-bottom: 0;
        }

        /* メリット・デメリット行のセル */
        .multi-comparison-table tr[data-row-key="advantages"] td,
        .multi-comparison-table tr[data-row-key="disadvantages"] td {
            vertical-align: top;
            min-width: 180px;
        }

        .multi-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
        }

        .multi-feature-card {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 16px;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .multi-feature-card h4 {
            margin: 0 0 12px 0;
            font-size: 14px;
            font-weight: 600;
            color: #1A1A1A;
        }

        .multi-feature-card ul {
            margin: 0 0 12px 0;
            padding-left: 18px;
            font-size: 12px;
            line-height: 1.6;
            color: #444;
            flex: 1;
        }

        .multi-feature-card .btn-view-detail {
            margin-top: auto;
        }

        /* ========================================
           BACK BUTTON
        ======================================== */
        .back-btn {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: 12px 20px;
            background: var(--color-bg-white);
            color: var(--color-text-primary);
            text-decoration: none;
            border: 1px solid var(--color-border);
            border-radius: var(--border-radius-md);
            margin-bottom: var(--space-xl);
            font-size: var(--font-size-sm);
            font-weight: var(--font-weight-semibold);
            transition: all var(--transition-base);
        }

        .back-btn::before {
            content: '←';
            font-size: var(--font-size-lg);
        }

        .back-btn:hover {
            background: var(--color-primary);
            color: white;
            border-color: var(--color-primary);
            transform: translateX(-4px);
        }

        /* ========================================
           DETAIL VIEW
        ======================================== */
        .detail-container {
            background: var(--color-bg-white);
            border: 1px solid var(--color-border-light);
            border-radius: var(--border-radius-lg);
            overflow: hidden;
            box-shadow: 0 1px 4px var(--color-shadow-sm);
        }

        .detail-header {
            padding: 38px var(--space-xl);
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            color: white;
        }

        .detail-header h1 {
            font-size: var(--font-size-2xl);
            font-weight: var(--font-weight-bold);
            margin-bottom: var(--space-sm);
        }

        .detail-content {
            padding: var(--space-2xl);
        }

        .section-title {
            font-size: var(--font-size-lg);
            font-weight: var(--font-weight-bold);
            color: var(--color-text-primary);
            margin-bottom: var(--space-md);
            padding-bottom: var(--space-sm);
            border-bottom: 2px solid var(--color-primary);
        }

        .properties-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: var(--space-xl);
        }

        .properties-table th,
        .properties-table td {
            text-align: left;
            padding: var(--space-md);
            border-bottom: 1px solid var(--color-border-light);
        }

        .properties-table th {
            background: var(--color-bg-subtle);
            font-weight: var(--font-weight-semibold);
            font-size: var(--font-size-sm);
            color: var(--color-text-secondary);
        }

        .properties-table td {
            font-size: var(--font-size-base);
        }

        .properties-table tr:hover {
            background: var(--color-bg-subtle);
        }

        .condition-badge {
            display: inline-block;
            padding: 2px 6px;
            background: var(--color-bg-subtle);
            border-radius: var(--border-radius-sm);
            font-size: var(--font-size-xs);
            color: var(--color-text-subtle);
            margin-left: var(--space-xs);
        }

        .source-link {
            color: var(--color-primary);
            text-decoration: none;
            font-size: var(--font-size-xs);
            font-weight: var(--font-weight-medium);
        }

        .source-link:hover {
            text-decoration: underline;
        }

        /* ========================================
           UTILITY CLASSES
        ======================================== */
        .hidden {
            display: none;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-in {
            animation: fadeIn 0.3s ease;
        }

        /* ビュー切り替えのフェードトランジション */
        #app {
            transition: opacity 0.25s ease;
        }

        #app.fade-out {
            opacity: 0;
        }

        #app.fade-visible {
            opacity: 1;
        }

        /* ========================================
           MOBILE RESPONSIVE (768px以下)
        ======================================== */
        @media (max-width: 768px) {
            /* ベースフォントサイズ拡大 */
            body {
                font-size: 15px;
            }

            main {
                padding: 10px 12px var(--space-xl);
            }

            /* ページタイトル */
            .page-title {
                font-size: 20px;
            }
            .page-subtitle {
                font-size: 13px;
            }

            /* サイドバー */
            .sidebar-filters {
                max-height: none;
                overflow: visible;
            }

            .facet-option {
                min-height: 44px;
                padding: 10px 12px;
                font-size: 14px;
            }

            .facet-column-title {
                font-size: 14px;
                padding: 10px 12px;
            }

            .facet-select {
                font-size: 14px;
                padding: 10px 12px;
                min-height: 44px;
            }

            /* 検索バー */
            .search-input {
                font-size: 16px;
                padding: 12px 16px 12px 44px;
            }

            /* カード1列表示 */
            .material-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .material-card {
                padding: 16px;
            }

            .material-name {
                font-size: 16px;
            }

            /* フィルタータグ */
            .filter-tag {
                font-size: 12px;
            }

            /* 詳細ページ */
            .detail-container {
                border-radius: 8px;
            }

            .detail-header {
                padding: 24px 16px;
            }

            .detail-header h1 {
                font-size: 22px;
            }

            .detail-content {
                padding: 16px;
            }

            .section-title {
                font-size: 16px;
            }

            /* テーブル横スクロール対応 */
            .properties-table {
                display: block;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }

            .properties-table th,
            .properties-table td {
                padding: 10px 12px;
                font-size: 13px;
                white-space: nowrap;
            }

            /* メリット・デメリットのグリッドを1列に */
            .detail-content > div[style*="grid-template-columns: 1fr 1fr"] {
                grid-template-columns: 1fr !important;
            }

            /* パンくず */
            .breadcrumb {
                font-size: 12px;
            }

            /* 比較コントロール */
            .comparison-controls {
                flex-wrap: wrap;
                gap: 8px;
            }

            /* モーダル */
            .modal-overlay {
                padding: 16px 8px;
            }

            .modal-content {
                max-width: 100%;
                max-height: 90vh;
                border-radius: 8px;
            }

            .modal-content.modal-wide,
            .modal-content.modal-extra-wide {
                max-width: 100%;
            }

            .modal-header {
                padding: 16px;
            }

            .modal-header h2 {
                font-size: 16px;
            }

            .modal-body {
                padding: 16px;
            }

            /* 比較テーブル横スクロール */
            .multi-comparison-table-wrapper {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }

            .multi-comparison-table th,
            .multi-comparison-table td {
                font-size: 13px;
                padding: 8px 10px;
                white-space: nowrap;
            }

            /* ボタンのタッチ領域 */
            .view-details-btn,
            .btn-find-alternatives,
            .btn-view-alt-detail {
                min-height: 44px;
                padding: 10px 16px;
            }

            /* 代替材料カード内のグリッドを1列に */
            .info-card div[style*="grid-template-columns: 1fr 1fr"] {
                grid-template-columns: 1fr !important;
            }

            /* disclaimer-banner */
            .disclaimer-banner {
                font-size: 12px;
                padding: 12px;
            }
        }

        /* ========================================
           SMALL MOBILE (480px以下)
        ======================================== */
        @media (max-width: 480px) {
            body {
                font-size: 15px;
            }

            main {
                padding: 8px 8px var(--space-lg);
            }

            .page-title {
                font-size: 18px;
            }

            .material-card {
                padding: 14px;
            }

            .detail-header {
                padding: 20px 12px;
            }

            .detail-header h1 {
                font-size: 20px;
            }

            .detail-content {
                padding: 12px;
            }

            .properties-table th,
            .properties-table td {
                padding: 8px 10px;
                font-size: 12px;
            }

            .modal-overlay {
                padding: 8px 4px;
            }
        }