:root {
            --primary-color: #28a745; --secondary-color: #007bff; --light-primary-color: #e9f7eb;
            --light-secondary-color: #e6f2ff; --text-color: #333; --light-text-color: #6c757d;
            --bg-color: #f0f2f5; --card-bg-color: #ffffff; --border-color: #dee2e6;
            --danger-color: #dc3545; --success-color: #28a745; --shadow: 0 4px 15px rgba(0, 0, 0, 0.07);
        }

        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"; background-color: var(--bg-color); color: var(--text-color); font-size: 16px; line-height: 1.6; }
        .navbar-default {
            background-color: #ffffff;
            border: none;
            box-shadow: 0 4px 12px rgba(0,0,0,0.06);
            min-height: 80px;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            padding: 0 15px;
            height: 80px;
            display: flex;
            align-items: center;
        }
        .navbar-brand .logo {
            height: 50px;
            width: auto;
        }
        .navbar-default .navbar-nav > li > a {
            color: var(--text-color);
            font-weight: 500;
            line-height: 50px;
            padding-top: 15px;
            padding-bottom: 15px;
            margin: 0 5px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .navbar-default .navbar-nav > li > a:hover,
        .navbar-default .navbar-nav > li > a:focus {
            color: var(--primary-color);
            background-color: var(--light-primary-color);
        }
        .navbar-default .navbar-nav > .active > a,
        .navbar-default .navbar-nav > .active > a:hover,
        .navbar-default .navbar-nav > .active > a:focus {
            color: var(--primary-color);
            background-color: var(--light-primary-color);
            font-weight: 600;
        }
        .navbar-default .navbar-toggle {
            border-color: #ddd;
            margin-top: 22px;
        }
        .navbar-default .navbar-toggle:hover,
        .navbar-default .navbar-toggle:focus {
            background-color: #f7f7f7;
        }
        .navbar-default .navbar-toggle .icon-bar {
            background-color: var(--primary-color);
        }
        .content-card { background-color: var(--card-bg-color); border-radius: 12px; box-shadow: var(--shadow); margin-top: 30px; padding: 30px; }
        .page-header { margin-top: 0; border-bottom-color: var(--border-color); }
        .page-header h1 { font-weight: 600; font-size: 32px; }
        .page-header p { font-size: 16px; }
        .trade-row { display: flex; align-items: flex-end; gap: 15px; margin-bottom: 15px; flex-wrap: wrap; }
        .trade-row .form-group { flex: 1; min-width: 120px; margin-bottom: 0; }
        .form-control { height: 42px; border-radius: 8px; border-color: var(--border-color); box-shadow: none; font-size: 16px; }
        .form-control:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.15); }
        .btn-remove-trade { background: none; border: none; color: var(--danger-color); font-size: 24px; font-weight: bold; padding: 0 5px; height: 42px; }
        .btn-add-trade { background-color: var(--light-primary-color); color: var(--primary-color); border: 1px dashed var(--primary-color); font-weight: 500; font-size: 16px; }
        .btn-calculate { background-color: var(--primary-color); border-color: var(--primary-color); font-weight: 600; font-size: 16px; }
        #results-section { margin-top: 30px; padding-top: 30px; border-top: 1px solid var(--border-color); }
        #results-section h2 { font-weight: 600; text-align: center; margin-bottom: 25px; font-size: 24px; }
        .result-text-area p { font-size: 18px; display: flex; justify-content: space-between; }
        .result-text-area p span { font-weight: 600; }
        .average-cost-display { background-color: var(--light-primary-color); border-radius: 8px; padding: 15px; text-align: center; margin-top: 20px; }
        .average-cost-display h3 { margin: 0; font-weight: 500; font-size: 16px; }
        .average-cost-display span { font-size: 32px; font-weight: 600; color: var(--primary-color); }
        #chart-container { min-height: 250px; }
        .info-card h2, .info-card h3, .info-card h4 { font-weight: 600; margin-top: 25px; margin-bottom: 15px; }
        .info-card h2 { font-size: 24px; }
        .info-card h3 { font-size: 20px; }
        .info-card h4 { font-size: 18px; }
        .info-card h2:first-child { margin-top: 0; }
        .info-card ul { padding-left: 20px; list-style-type: square; }
        .info-card li { margin-bottom: 8px; font-size: 16px; }
        .site-footer { background-color: #2c3e50; color: #bdc3c7; padding: 40px 0 20px; margin-top: 50px; }
        .site-footer h4 { color: #ffffff; font-weight: 600; margin-bottom: 15px; }
        .footer-bottom { border-top: 1px solid #34495e; margin-top: 30px; padding-top: 20px; display: flex; justify-content: space-between; align-items: center; }
        .footer-links a { color: #bdc3c7; text-decoration: none; margin: 0 10px; }
        #sell-simulator-card { display: none; border-top: 2px solid var(--secondary-color); margin-top: 30px; padding-top: 25px; }
        #sell-simulator-card h2 { text-align: center; color: var(--secondary-color); margin-top:0; font-size: 24px; }
        .sell-result-area p { font-size: 16px; margin-bottom: 15px; }
        .sell-result-area span { font-weight: 600; }
        #realized-pnl.profit { color: var(--success-color); }
        #realized-pnl.loss { color: var(--danger-color); }
        .result-insights {
            margin-top: 20px;
            padding: 15px;
            border-radius: 8px;
            background-color: var(--light-secondary-color);
        }
        .result-insights p {
            font-size: 16px;
            font-weight: 500;
            margin-bottom: 5px;
        }
        .profit { color: var(--success-color); font-weight: 600; }
        .loss { color: var(--danger-color); font-weight: 600; }
        .neutral { color: var(--text-color); font-weight: 600; }