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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #ecf0f1;
            background-color: #2c3e50;
            max-width: 800px;
            margin: 0 auto;
            padding: 15px;
        }

        .container {
            background-color: #34495e;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
            margin-bottom: 20px;
            overflow: hidden;
        }

        h1,
        h2,
        h3,
        h4 {
            color: #f39c12;
            margin-bottom: 15px;
        }

        h1 {
            text-align: center;
            font-size: 2.2em;
            color: #f1c40f;
            text-transform: uppercase;
            letter-spacing: 1px;
            text-shadow: 0 0 5px #f39c12, 0 0 15px #e67e22;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 15px;
            line-height: 1.2;
        }

        h1::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            background: linear-gradient(to right, transparent, #f39c12, transparent);
        }

        h2 {
            font-size: 1.8em;
            margin-top: 10px;
        }

        h3 {
            font-size: 1.4em;
        }

        h4 {
            font-size: 1.2em;
        }

        p {
            margin-bottom: 15px;
            line-height: 1.6;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            margin: 15px 0;
            background-color: #3d566e;
            font-size: 0.9em;
        }

        th,
        td {
            padding: 12px 10px;
            text-align: left;
            border-bottom: 1px solid #4a6572;
        }

        th {
            background-color: #2c3e50;
            color: #f39c12;
        }

        tr:nth-child(even) {
            background-color: rgba(44, 62, 80, 0.4);
        }

        .highlight {
            background-color: #f1c40f;
            color: #2c3e50;
            font-weight: bold;
            padding: 3px 6px;
            border-radius: 3px;
        }

        .tip {
            background-color: rgba(39, 174, 96, 0.15);
            color: #ecf0f1;
            padding: 15px;
            border-left: 4px solid #27ae60;
            border-radius: 3px;
            margin: 15px 0;
        }

        .math-box {
            background-color: #4a6572;
            padding: 15px;
            border-radius: 5px;
            margin: 15px 0;
            overflow-x: auto;
        }

        .note {
            background-color: rgba(22, 160, 133, 0.15);
            color: #ecf0f1;
            padding: 15px;
            border-left: 4px solid #1abc9c;
            border-radius: 3px;
            margin: 15px 0;
        }

        .warning {
            background-color: rgba(231, 76, 60, 0.15);
            padding: 15px;
            border-left: 4px solid #c0392b;
            border-radius: 3px;
            margin: 15px 0;
        }

        .accuracy-notice {
            background-color: rgba(243, 156, 18, 0.15);
            padding: 12px;
            border-left: 4px solid #f39c12;
            border-radius: 3px;
            margin: 15px 0;
            font-size: 0.9em;
            text-align: center;
        }

        .comparison {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 20px;
            margin: 20px 0;
        }

        .comparison-box {
            flex: 1;
            min-width: 250px;
            background-color: #3d566e;
            padding: 20px;
            border-radius: 8px;
            text-align: center;
        }

        .comparison-box:nth-child(2) {
            background-color: rgba(39, 174, 96, 0.15);
            border: 1px solid #27ae60;
        }

        .comparison-value {
            font-size: 24px;
            font-weight: bold;
            color: #f39c12;
            margin: 10px 0;
        }

        .resource-list {
            background-color: #4a6572;
            padding: 15px;
            border-radius: 5px;
            margin: 15px 0;
        }

        .resource-list a {
            color: #f39c12;
            text-decoration: none;
            display: block;
            padding: 5px 0;
        }

        .resource-list a:hover {
            text-decoration: underline;
        }

        ul,
        ol {
            padding-left: 20px;
            margin-bottom: 15px;
        }

        li {
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .footer {
            text-align: center;
            margin-top: 30px;
            font-size: 0.9em;
            color: #7f8c8d;
            padding: 15px 0;
        }

        .footer a {
            color: #f39c12;
            text-decoration: none;
        }

        .footer a:hover {
            text-decoration: underline;
        }

        .calculator {
            background: linear-gradient(to bottom, #465c71, #34495e);
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
            border: 1px solid #f39c12;
        }

        .calculator h3 {
            text-align: center;
            margin-bottom: 20px;
            color: #f1c40f;
        }

        .input-group {
            margin-bottom: 15px;
        }

        .input-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }

        .input-group input {
            width: 100%;
            padding: 10px;
            border: 1px solid #4a6572;
            border-radius: 4px;
            background-color: #2c3e50;
            color: #ecf0f1;
        }

        .btn {
            background-color: #f39c12;
            color: #2c3e50;
            border: none;
            padding: 10px 15px;
            border-radius: 4px;
            cursor: pointer;
            font-weight: bold;
            display: block;
            width: 100%;
            margin-top: 10px;
        }

        .btn:hover {
            background-color: #e67e22;
        }

        .result-box {
            margin-top: 20px;
            padding: 15px;
            background-color: rgba(44, 62, 80, 0.7);
            border-radius: 5px;
            border-left: 4px solid #f39c12;
        }

        .result-item {
            margin-bottom: 10px;
        }

        .result-value {
            font-weight: bold;
            color: #f39c12;
        }

        @media screen and (max-width: 768px) {
            body {
                padding: 10px;
            }

            h1 {
                font-size: 1.8em;
                padding-bottom: 10px;
            }

            h2 {
                font-size: 1.5em;
            }

            h3 {
                font-size: 1.3em;
            }

            .container {
                padding: 15px;
            }

            .comparison-box {
                min-width: 100%;
            }

            table {
                font-size: 0.85em;
            }

            th,
            td {
                padding: 8px 6px;
            }
        }

        @media screen and (max-width: 480px) {
            h1 {
                font-size: 1.5em;
            }

            h2 {
                font-size: 1.3em;
            }

            h3 {
                font-size: 1.1em;
            }

            .math-box,
            .note,
            .warning,
            .tip,
            .resource-list,
            .accuracy-notice {
                padding: 12px;
            }

            table {
                display: block;
                overflow-x: auto;
                white-space: nowrap;
            }

            .comparison-value {
                font-size: 20px;
            }

            ul,
            ol {
                padding-left: 15px;
            }
        }