:root {
            --bg-color: #f8fafc;
            --card-bg: #ffffff;
            --card-hover: #f1f5f9;
            --text-color: #0f172a;
            --text-muted: #64748b;
            --accent: #0284c7;
            --success: #16a34a;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-color);
            min-height: 100vh;
            padding: 2rem 1rem;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .nav-breadcrumb {
            width: 100%;
            max-width: 1000px;
            margin-bottom: 1.5rem;
            font-size: 0.9rem;
        }

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

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

        .nav-breadcrumb span {
            color: var(--text-muted);
            margin: 0 0.5rem;
        }

        header {
            text-align: center;
            margin-bottom: 2.5rem;
            max-width: 600px;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 800;
            letter-spacing: -0.05em;
            margin-bottom: 0.5rem;
            background: linear-gradient(to right, #0284c7, #4f46e5);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        header p {
            color: var(--text-muted);
            font-size: 1.1rem;
        }

        .search-container {
            width: 100%;
            max-width: 500px;
            margin-bottom: 2rem;
            position: relative;
        }

        #searchBar {
            width: 100%;
            padding: 1rem 1.5rem;
            font-size: 1.1rem;
            background-color: var(--card-bg);
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            color: var(--text-color);
            outline: none;
            transition: all 0.2s ease;
        }

        #searchBar:focus {
            border-color: var(--accent);
            box-shadow: 0 0 15px rgba(2, 132, 199, 0.15);
        }

        #shareButton {
            margin: 0 auto 2.5rem auto;
            display: block;
            padding: 10px 20px;
            cursor: pointer;
            background-color: var(--card-bg);
            border: 1px solid #e2e8f0;
            color: var(--text-color);
            font-weight: 600;
            border-radius: 30px;
            font-size: 0.9rem;
            transition: all 0.2s ease;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }

        #shareButton:hover {
            background-color: var(--card-hover);
            border-color: var(--accent);
            transform: translateY(-1px);
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            gap: 1rem;
            width: 100%;
            max-width: 1000px;
            padding: 0 1rem;
        }

        .symbol-card {
            background-color: var(--card-bg);
            border-radius: 12px;
            aspect-ratio: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            user-select: none;
            border: 1px solid #e2e8f0;
            position: relative;
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
        }

        .symbol-card:hover {
            background-color: var(--card-hover);
            transform: translateY(-2px);
            border-color: #cbd5e1;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        }

        .symbol-char {
            font-size: 2.2rem;
            margin-bottom: 0.2rem;
        }

        .symbol-name {
            font-size: 0.75rem;
            color: var(--text-muted);
            text-align: center;
            padding: 0 0.25rem;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            width: 100%;
        }

        .symbol-card.copied {
            background-color: rgba(22, 163, 74, 0.1);
            border-color: var(--success);
            transform: scale(0.95);
        }

        .symbol-card.copied .symbol-char {
            display: none;
        }

        .symbol-card.copied .symbol-name {
            color: var(--success);
            font-weight: bold;
            font-size: 0.9rem;
        }

        .content-section {
            max-width: 960px;
            width: 100%;
            margin: 5rem auto 2rem auto;
            padding: 0 1rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .content-section h2 {
            color: var(--text-color);
            margin-bottom: 1rem;
            font-size: 1.6rem;
            font-weight: 700;
        }

        .content-section h3 {
            color: var(--accent);
            margin: 1.5rem 0 0.5rem 0;
            font-size: 1.2rem;
        }

        .content-section p {
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }

        .keyword-hub-tags {
            margin-top: 1rem;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .keyword-hub-tags a {
            text-decoration: none;
        }

        .keyword-hub-tags span {
            background: #ffffff;
            color: #0284c7;
            padding: 4px 12px;
            font-size: 0.8rem;
            border-radius: 20px;
            border: 1px solid #e2e8f0;
            transition: all 0.2s;
            display: inline-block;
        }

        .keyword-hub-tags span:hover {
            background: #f1f5f9;
            border-color: #cbd5e1;
        }

        .main-footer {
            margin-top: auto;
            padding: 4rem 0 1rem 0;
            color: var(--text-muted);
            font-size: 0.85rem;
            text-align: center;
            width: 100%;
            border-top: 1px solid #e2e8f0;
        }

        .main-footer a {
            color: var(--text-muted);
            text-decoration: none;
            margin: 0 10px;
        }

        .main-footer a:hover {
            color: var(--accent);
        }

        @media (max-width: 480px) {
            .grid {
                grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
                gap: 0.75rem;
            }
            .symbol-char { font-size: 1.8rem; }
            h1 { font-size: 2rem; }
        }