:root {
            --background-primary: #0a0c0f;
            --background-secondary: #14181c;
            --background-tertiary: #1e2429;
            --accent-primary: #00e676;
            --accent-secondary: #00b0ff;
            --text-primary: #ffffff;
            --text-secondary: #a0a8b8;
            --border-color: rgba(255, 255, 255, 0.08);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--background-primary);
            color: var(--text-primary);
            min-height: 100vh;
            padding-bottom: 90px;
        }

        .header {
            background: var(--background-secondary);
            border-bottom: 1px solid var(--border-color);
            padding: 16px 24px;
            position: sticky;
            top: 0;
            z-index: 90;
        }

        .header-content {
            max-width: 850px;
            margin: 0 auto;
        }

        .page-title { font-size: 1.3rem; font-weight: 700; }

        .container {
            max-width: 850px;
            margin: 0 auto;
            padding: 24px 16px;
        }

        .card-section {
            background: var(--background-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 20px;
            margin-bottom: 24px;
        }

        .section-heading {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--accent-primary);
            margin-bottom: 12px;
        }

        .about-text {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.6;
        }

        /* Crypto List Grid */
        .crypto-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 16px;
            margin-top: 16px;
        }

        .crypto-card {
            background: var(--background-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .crypto-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .crypto-name {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .crypto-symbol {
            font-size: 11px;
            font-weight: 700;
            color: var(--accent-primary);
            background: rgba(0, 230, 118, 0.1);
            padding: 2px 6px;
            border-radius: 4px;
        }

        .address-box {
            display: flex;
            align-items: center;
            background: var(--background-primary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 8px 10px;
            gap: 8px;
        }

        .address-text {
            font-family: monospace;
            font-size: 11px;
            color: var(--text-secondary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            flex: 1;
        }

        .copy-btn {
            background: var(--accent-primary);
            color: #000;
            border: none;
            border-radius: 4px;
            padding: 4px 10px;
            font-size: 11px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
        }

        .copy-btn:hover {
            opacity: 0.85;
        }

        /* Bottom Nav bar for 4 items */
        .bottom-nav {
            position: fixed;
            bottom: 0; left: 0; right: 0;
            height: 65px;
            background: var(--background-secondary);
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: space-around;
            align-items: center;
            z-index: 100;
            max-width: 850px;
            margin: 0 auto;
        }

        .nav-item {
            display: flex; flex-direction: column; align-items: center; gap: 4px;
            color: var(--text-secondary); font-size: 11px; font-weight: 500;
            text-decoration: none; padding: 6px 14px; border-radius: var(--radius-lg);
            transition: var(--transition);
        }

        .nav-item svg {
            width: 20px; height: 20px; fill: none; stroke: currentColor;
            stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
        }

        .nav-item.active-pill {
            background: var(--background-tertiary); color: var(--accent-primary);
            border: 1px solid var(--border-color);
        }