@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

        .stt-app-body {
            margin: 0 !important;
            padding: 20px 0 !important;
            background-color: #ffffff !important;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif !important;
            color: #1e293b !important;
            line-height: 1.6 !important;
            -webkit-font-smoothing: antialiased !important;
        }

        .stt-app-container {
            max-width: 1048px !important;
            width: 100% !important;
            margin: 0 auto !important;
            padding-left: 0 !important;
            padding-right: 0 !important;
            background-color: #ffffff !important;
            box-sizing: border-box !important;
        }

        .stt-intro-banner {
            margin-bottom: 24px !important;
            padding: 0 !important;
            background: transparent !important;
            border: none !important;
            box-shadow: none !important;
        }

        .stt-banner-desc {
            font-size: 15px !important;
            color: #334155 !important;
            margin: 0 0 12px 0 !important;
            line-height: 1.7 !important;
        }

        .stt-banner-desc strong {
            color: #059669 !important;
            font-weight: 700 !important;
        }

        .stt-copy-notice {
            display: inline-flex !important;
            align-items: center !important;
            gap: 8px !important;
            background-color: #ecfdf5 !important;
            color: #059669 !important;
            border: 1px solid #6ee7b7 !important;
            font-size: 13.5px !important;
            font-weight: 700 !important;
            padding: 8px 16px !important;
            border-radius: 8px !important;
            margin-top: 6px !important;
        }

        .stt-tabs-wrapper {
            margin-top: 20px !important;
        }

        /* Hide radio inputs */
        .stt-tab-radio {
            display: none !important;
        }

        .stt-tabs-nav {
            display: flex !important;
            flex-wrap: wrap !important;
            gap: 10px !important;
            margin-bottom: 24px !important;
            border-bottom: 2px solid #f1f5f9 !important;
            padding-bottom: 12px !important;
        }

        .stt-tab-btn {
            display: inline-flex !important;
            align-items: center !important;
            padding: 10px 18px !important;
            background-color: #f8fafc !important;
            color: #64748b !important;
            border: 1px solid #e2e8f0 !important;
            border-radius: 30px !important;
            font-size: 14px !important;
            font-weight: 600 !important;
            cursor: pointer !important;
            transition: all 0.2s ease !important;
            user-select: none !important;
        }

        .stt-tab-btn:hover {
            background-color: #f1f5f9 !important;
            color: #0f172a !important;
        }

        /* Active Tab Styles */
        #stt-tab-all:checked ~ .stt-tabs-nav label[for="stt-tab-all"],
        #stt-tab-vui:checked ~ .stt-tabs-nav label[for="stt-tab-vui"],
        #stt-tab-nl:checked ~ .stt-tabs-nav label[for="stt-tab-nl"],
        #stt-tab-tc:checked ~ .stt-tabs-nav label[for="stt-tab-tc"],
        #stt-tab-en:checked ~ .stt-tabs-nav label[for="stt-tab-en"] {
            background-color: #10b981 !important;
            color: #ffffff !important;
            border-color: #10b981 !important;
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25) !important;
        }

        .stt-grid-container {
            display: grid !important;
            grid-template-columns: repeat(2, 1fr) !important;
            gap: 16px !important;
        }

        .stt-section-title {
            grid-column: 1 / -1 !important;
            font-size: 18px !important;
            font-weight: 700 !important;
            color: #0f172a !important;
            margin: 20px 0 8px 0 !important;
            padding-bottom: 8px !important;
            border-bottom: 2px solid #10b981 !important;
            display: block !important;
        }

        .stt-card {
            position: relative !important;
            background-color: #ffffff !important;
            border: 1px solid #e2e8f0 !important;
            border-radius: 12px !important;
            padding: 18px 20px !important;
            font-size: 14.5px !important;
            color: #1e293b !important;
            line-height: 1.6 !important;
            cursor: pointer !important;
            transition: all 0.2s ease !important;
            box-sizing: border-box !important;
            display: flex !important;
            flex-direction: column !important;
            justify-content: center !important;
        }

        .stt-card:hover {
            border-color: #10b981 !important;
            background-color: #f0fdf4 !important;
            transform: translateY(-2px) !important;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05) !important;
        }

        .stt-card-text {
            word-break: break-word !important;
        }

        .stt-poem-text {
            white-space: pre-line !important;
            font-style: italic !important;
        }

        /* Pure CSS Filter Rules */
        #stt-tab-vui:checked ~ .stt-grid-container > *:not(.cat-vui),
        #stt-tab-nl:checked ~ .stt-grid-container > *:not(.cat-nl),
        #stt-tab-tc:checked ~ .stt-grid-container > *:not(.cat-tc),
        #stt-tab-en:checked ~ .stt-grid-container > *:not(.cat-en) {
            display: none !important;
        }

        .copy-toast {
            position: absolute !important;
            background-color: #059669 !important;
            color: #ffffff !important;
            padding: 6px 14px !important;
            border-radius: 20px !important;
            font-size: 13px !important;
            font-weight: 700 !important;
            box-shadow: 0 4px 14px rgba(5, 150, 105, 0.35) !important;
            z-index: 9999 !important;
            display: none;
            pointer-events: none !important;
            white-space: nowrap !important;
            animation: copyToastFade 0.2s ease-out !important;
        }

        @keyframes copyToastFade {
            from { opacity: 0; transform: translate(-50%, 5px); }
            to { opacity: 1; transform: translate(-50%, 0); }
        }

        @media (max-width: 768px) {
            .stt-grid-container {
                grid-template-columns: 1fr !important;
            }
        }

        @media (max-width: 480px) {
            .stt-app-body {
                padding: 10px 0 !important;
            }
            .stt-banner-desc {
                font-size: 13.5px !important;
            }
            .stt-copy-notice {
                font-size: 12.5px !important;
                padding: 6px 12px !important;
                width: 100% !important;
                box-sizing: border-box !important;
                justify-content: center !important;
            }
            .stt-tabs-nav {
                gap: 6px !important;
            }
            .stt-tab-btn {
                padding: 8px 14px !important;
                font-size: 13px !important;
                flex: 1 1 auto !important;
                justify-content: center !important;
            }
            .stt-section-title {
                font-size: 16px !important;
                margin: 16px 0 6px 0 !important;
            }
            .stt-card {
                padding: 14px 16px !important;
                font-size: 13.5px !important;
            }
        }