* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', 'Segoe UI', Tahoma, sans-serif;
        }

        body {
            background-color: #f5f7fa;
            color: #2d3748;
            transition: all 0.3s ease;
        }

        body.dark-mode {
            background-color: #1a202c;
            color: #e2e8f0;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
            display: flex;
            gap: 20px;
        }

        .sidebar {
            width: 240px;
            position: sticky;
            top: 20px;
            background: #ffffff;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            height: fit-content;
        }

        body.dark-mode .sidebar {
            background: #2d3748;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        }

        .sidebar h2 {
            font-size: 1.4rem;
            color: #4c51bf;
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar h2 {
            color: #a5b4fc;
        }

        .sidebar ul {
            list-style: none;
        }

        .sidebar li {
            margin: 12px 0;
        }

        .sidebar a {
            text-decoration: none;
            color: #4a5568;
            font-size: 0.95rem;
            transition: color 0.2s;
            display: block;
            padding: 8px 0;
        }

        body.dark-mode .sidebar a {
            color: #a0aec0;
        }

        .sidebar a:hover {
            color: #4c51bf;
        }

        body.dark-mode .sidebar a:hover {
            color: #a5b4fc;
        }

        .main-content {
            flex: 1;
            padding: 10px;
        }

        header {
            text-align: left;
            padding: 15px 20px;
            margin-bottom: 20px;
        }

        header h1 {
            font-size: 2rem;
            font-weight: 600;
            color: #4c51bf;
            text-align: center;
        }

        body.dark-mode header h1 {
            color: #a5b4fc;
        }

        .toggle-mode {
            position: absolute;
            right: 20px;
            cursor: pointer;
            font-size: 0.95rem;
            padding: 8px 16px;
            background: #4c51bf;
            color: #ffffff;
            border-radius: 8px;
            transition: background 0.3s, transform 0.2s;
        }

        body.dark-mode .toggle-mode {
            background: #6366f1;
        }

        .toggle-mode:hover {
            background: #4338ca;
            transform: scale(1.05);
        }

        body.dark-mode .toggle-mode:hover {
            background: #7f9cf5;
        }

        .trade-section {
            margin-bottom: 25px;
            margin-top: 60px;
        }

        .trade-section h2 {
            font-size: 1.7rem;
            font-weight: 600;
            color: #2d3748;
            background: #edf2f7;
            padding: 12px 15px;
            border-radius: 8px;
            margin-bottom: 10px;
        }

        body.dark-mode .trade-section h2 {
            color: #e2e8f0;
            background: #2d3748;
        }

        .accordion {
            background: #ffffff;
            border-radius: 8px;
            margin: 8px 0;
            overflow: hidden;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
        }

        body.dark-mode .accordion {
            background: #2d3748;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
        }

        .accordion-header {
            padding: 12px 15px;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 500;
            color: #4c51bf;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s;
        }

        body.dark-mode .accordion-header {
            color: #a5b4fc;
        }

        .accordion-header:hover {
            background: #f7fafc;
        }

        body.dark-mode .accordion-header:hover {
            background: #4a5568;
        }

        .accordion-header::after {
            content: '+';
            font-size: 1.3rem;
            transition: transform 0.2s;
        }

        .accordion-header.active::after {
            content: '−';
            transform: rotate(180deg);
        }

        .accordion-content {
            display: none;
            padding: 12px 15px;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .accordion-content.active {
            display: block;
        }

        .accordion-content ul {
            list-style-type: none;
            padding-left: 0;
        }

        .accordion-content li {
            margin: 6px 0;
            position: relative;
            padding-left: 20px;
        }

        .accordion-content li::before {
            content: '→';
            position: absolute;
            left: 0;
            color: #4c51bf;
        }

        body.dark-mode .accordion-content li::before {
            color: #a5b4fc;
        }

        @media (max-width: 1024px) {
            .container {
                gap: 15px;
            }

            .sidebar {
                width: 200px;
            }

            .trade-section h2 {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 768px) {
            .container {
                flex-direction: column;
                padding: 15px;
            }

            .sidebar {
                width: 100%;
                position: static;
                margin-bottom: 15px;
                padding: 15px;
                display: flex;
                flex-wrap: wrap;
                gap: 10px;
                justify-content: center;
                border-radius: 8px;
            }

            .sidebar h2 {
                font-size: 1.3rem;
                width: 100%;
                text-align: center;
                margin-bottom: 10px;
            }

            .sidebar ul {
                display: flex;
                flex-wrap: wrap;
                gap: 8px;
                justify-content: center;
            }

            .sidebar li {
                margin: 0;
            }

            .sidebar a {
                font-size: 0.9rem;
                padding: 8px 16px;
                background: #e2e8f0;
                color: #4c51bf;
                border-radius: 20px;
                text-align: center;
                transition: background 0.2s, color 0.2s;
            }

            body.dark-mode .sidebar a {
                background: #4a5568;
                color: #a5b4fc;
            }

            .sidebar a:hover {
                background: #4c51bf;
                color: #ffffff;
            }

            body.dark-mode .sidebar a:hover {
                background: #a5b4fc;
                color: #1a202c;
            }

            header h1 {
                font-size: 1.7rem;
            }

            .trade-section h2 {
                font-size: 1.5rem;
                padding: 10px;
            }

            .accordion-header {
                font-size: 1rem;
                padding: 10px 12px;
            }

            .accordion-content {
                font-size: 0.85rem;
                padding: 10px 12px;
            }

            .toggle-mode {
                font-size: 0.85rem;
                padding: 6px 12px;
                right: 15px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 10px;
            }

            .main-content {
                flex: 1;
                padding: 0px;
            }

            header {
                padding: 10px;
            }

            header h1 {
                font-size: 1.5rem;
            }

            .sidebar {
                padding: 10px;
                gap: 8px;
            }

            .sidebar a {
                font-size: 0.85rem;
                padding: 6px 12px;
            }

            .trade-section {
                margin-bottom: 15px;
                margin-top: 50px;
            }

            .accordion {
                margin: 5px 0;
            }

            .accordion-header {
                padding: 8px 10px;
            }

            .accordion-content {
                padding: 8px 10px;
            }

            .toggle-mode {
                font-size: 0.8rem;
                padding: 5px 10px;
            }
        }