body {
            font-family: 'Segoe UI', 'Inter', Arial, sans-serif;
            line-height: 1.7;
            color: #1f2937;
            max-width: 1100px;
            margin: 18px auto 0;
            padding: 28px 24px 40px;
            font-size: 18px;
            background:
                radial-gradient(circle at 10% 8%, #dbeafe 0%, rgba(219, 234, 254, 0) 42%),
                radial-gradient(circle at 92% 2%, #e0f2fe 0%, rgba(224, 242, 254, 0) 36%),
                #ffffff;
        }
        
        h1 {
            color: #0f172a;
            margin: 0 0 12px 0;
            font-size: 2.55rem;
            letter-spacing: 0.2px;
            line-height: 1.2;
        }
        
        h2 {
            color: #0f172a;
            margin-top: 0;
            font-size: 1.6rem;
        }

        .logo-banner {
            width: 100%;
            margin-bottom: 18px;
            border-radius: 18px;
            overflow: hidden;
            border: 1px solid #bfdbfe;
            box-shadow: 0 14px 30px rgba(30, 64, 175, 0.12);
            background: linear-gradient(120deg, #dbeafe 0%, #f0f9ff 100%);
            min-height: 170px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .logo-banner img {
            width: 100%;
            height: 170px;
            object-fit: fill;
            display: block;
            transition: transform 0.35s ease, filter 0.35s ease;
            filter: saturate(1.05) contrast(1.04);
        }

        .logo-banner::after {
            content: "";
            position: absolute;
            top: 0;
            left: -45%;
            width: 35%;
            height: 100%;
            background: linear-gradient(110deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.45) 50%, rgba(255, 255, 255, 0) 100%);
            transform: skewX(-18deg);
            pointer-events: none;
            transition: left 0.7s ease;
        }

        .logo-banner:hover::after {
            left: 115%;
        }

        .logo-banner:hover img {
            transform: scale(1.015);
            filter: saturate(1.12) contrast(1.08);
        }
        
        .hero {
            background: linear-gradient(145deg, #eef2ff 0%, #f0f9ff 40%, #ffffff 100%);
            border: 1px solid #c7d2fe;
            border-radius: 18px;
            padding: 28px 26px 24px;
            margin-bottom: 32px;
            box-shadow: 0 24px 42px rgba(30, 64, 175, 0.14);
            border-left: 9px solid #2563eb;
        }

        .subtitle {
            color: #d97706;
            font-size: 1.9em;
            font-weight: 900;
            margin: 0;
            background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 45%, #fef3c7 100%);
            border: 1px solid #fdba74;
            border-left: 6px solid #f97316;
            padding: 16px 18px;
            border-radius: 12px;
            letter-spacing: 0.35px;
            text-align: center;
            text-transform: uppercase;
            box-shadow: 0 10px 24px rgba(249, 115, 22, 0.28);
            white-space: nowrap;
            text-shadow: 0 1px 0 #fff7ed, 0 0 12px rgba(251, 146, 60, 0.3);
        }

        .credit {
            margin-top: 8px;
            color: #1e3a8a;
            font-size: 1.18rem;
            font-weight: 700;
            text-align: center;
        }

        .micro-guide {
            background: linear-gradient(145deg, #ffffff 0%, #f0f9ff 100%);
            border: 1px solid #bfdbfe;
            border-radius: 14px;
            padding: 16px 18px;
            margin-bottom: 20px;
            box-shadow: 0 12px 24px rgba(30, 41, 59, 0.08);
        }

        .micro-guide h3 {
            margin: 0 0 8px 0;
            color: #1e3a8a;
            font-size: 1.4rem;
        }

        .micro-guide p {
            margin: 4px 0;
            color: #334155;
            font-size: 1.18rem;
            font-weight: 650;
            line-height: 1.7;
        }

        .micro-guide .updated {
            margin-top: 8px;
            color: #0f766e;
            font-weight: 800;
            font-size: 1.2rem;
        }

        .feature-nav {
            background: #ffffff;
            border: 1px solid #bfdbfe;
            border-radius: 14px;
            padding: 14px 16px;
            margin-bottom: 22px;
            box-shadow: 0 10px 20px rgba(30, 41, 59, 0.08);
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            position: sticky;
            top: 10px;
            z-index: 40;
            backdrop-filter: blur(4px);
        }

        .feature-nav label {
            font-weight: 700;
            color: #1d4ed8;
            font-size: 1.14rem;
            font-family: 'Inter', 'Segoe UI Variable Text', 'Segoe UI', 'Aptos', 'Arial', sans-serif;
        }

        .feature-nav select {
            padding: 11px 14px;
            border-radius: 10px;
            border: 1px solid #93c5fd;
            font-size: 1.18rem;
            font-weight: 650;
            min-width: 320px;
            background: #f8fbff;
            color: #0f172a;
            cursor: pointer;
            font-family: 'Inter', 'Segoe UI Variable Text', 'Segoe UI', 'Aptos', 'Calibri', sans-serif;
            line-height: 1.35;
            letter-spacing: 0.15px;
            appearance: none;
            -webkit-appearance: none;
            -moz-appearance: none;
            padding-right: 42px;
            background-image:
                linear-gradient(45deg, transparent 50%, #1d4ed8 50%),
                linear-gradient(135deg, #1d4ed8 50%, transparent 50%);
            background-position:
                calc(100% - 18px) calc(50% - 3px),
                calc(100% - 12px) calc(50% - 3px);
            background-size: 6px 6px, 6px 6px;
            background-repeat: no-repeat;
            box-shadow: 0 2px 8px rgba(30, 64, 175, 0.08);
        }

        .feature-nav select:focus {
            outline: none;
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
        }

        .feature-nav select option {
            font-family: 'Inter', 'Segoe UI Variable Text', 'Segoe UI', 'Aptos', 'Calibri', sans-serif;
            font-size: 1.12rem;
            font-weight: 600;
            padding: 8px 10px;
        }
        
        .feature {
            margin-bottom: 35px;
            page-break-inside: avoid;
            background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
            border: 1px solid #cfe3ff;
            border-radius: 16px;
            padding: 22px;
            box-shadow: 0 14px 28px rgba(30, 41, 59, 0.08);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }

        .feature:hover {
            transform: translateY(-3px);
            box-shadow: 0 20px 34px rgba(30, 41, 59, 0.14);
        }
        
        .function {
            background-color: #f1f5f9;
            color: #1f2937;
            padding: 16px;
            border-left: 5px solid #3b82f6;
            margin-bottom: 14px;
            border-radius: 8px;
            font-size: 1.12rem;
            line-height: 1.8;
            font-weight: 600;
        }

        .function strong {
            color: #1e3a8a;
            font-size: 1.18rem;
        }
        
        .prompt-label {
            font-weight: 800;
            color: #1d4ed8;
            margin-top: 15px;
            margin-bottom: 10px;
            font-size: 1.28rem;
            letter-spacing: 0.2px;
        }
        
        .prompt-text {
            background: linear-gradient(180deg, #eef6ff 0%, #e0f2fe 100%);
            color: #0f172a;
            padding: 16px;
            border: 1px solid #bae6fd;
            border-left: 6px solid #0284c7;
            margin-bottom: 16px;
            font-style: normal;
            white-space: pre-wrap;
            font-family: 'Consolas', 'Monaco', monospace;
            border-radius: 8px;
            font-size: 1.18rem;
            line-height: 1.75;
            font-weight: 600;
        }
        
        .code-label {
            display: none;
        }
        
        pre {
            background-color: #0f172a;
            color: #e2e8f0;
            padding: 16px;
            border-radius: 8px;
            overflow-x: auto;
            font-size: 0.76rem;
            border-left: 5px solid #8b5cf6;
            margin-top: 10px;
        }

        .copyable-block {
            position: relative;
            margin-bottom: 15px;
        }

        .has-copy-control {
            padding-top: 46px !important;
            margin-bottom: 0 !important;
        }

        .copy-btn {
            color: white;
            border: none;
            padding: 8px 12px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.84em;
            font-weight: 600;
            position: absolute;
            top: 10px;
            right: 10px;
            z-index: 2;
            box-shadow: 0 6px 14px rgba(0, 0, 0, 0.22);
        }

        .prompt-copy-btn {
            background-color: #2563eb;
        }

        .prompt-copy-btn:hover {
            background-color: #1d4ed8;
        }

        .code-copy-btn {
            background-color: #8e44ad;
        }

        .code-copy-btn:hover {
            background-color: #732d91;
        }

        .reveal-code-btn {
            background-color: #0f172a;
            left: 10px;
            right: auto;
        }

        .reveal-code-btn:hover {
            background-color: #1e293b;
        }
        
        .footer {
            margin-top: 50px;
            padding-top: 20px;
            border-top: 2px solid #cbd5e1;
            text-align: center;
            color: #334155;
            font-style: italic;
            font-size: 1.28rem;
            font-weight: 700;
        }

        .top-btn {
            position: fixed;
            right: 20px;
            bottom: 20px;
            background: #1d4ed8;
            color: #ffffff;
            border: none;
            border-radius: 999px;
            padding: 11px 14px;
            font-size: 0.95rem;
            font-weight: 700;
            cursor: pointer;
            box-shadow: 0 14px 26px rgba(30, 64, 175, 0.25);
            display: none;
            z-index: 120;
        }

        .top-btn:hover {
            background: #1e40af;
        }