:root {
            --primary: #006be5;
            --bg: #f4f6f9;
            --card: #ffffff;
            --text: #333;
            --success: #28a745;
            --error: #dc3545;
            --warning: #ffc107;
            --border: #e0e0e0;
            --accent: #0381fe;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            margin: 0;
            padding: 20px;
            transition: direction 0.3s ease;
        }

        .header-content {
            border: 1px solid #cce5ff;
            padding: 10px;
            border-radius: 12px;
            background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 100%);
            ;
        }

        .lang-bar {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 20px;
        }

        .lang-btn {
            padding: 5px 15px;
            border: 1px solid var(--primary);
            background: white;
            cursor: pointer;
            border-radius: 20px;
            font-weight: bold;
            transition: 0.3s;
        }

        .lang-btn:hover,
        .lang-btn.active {
            background: var(--primary);
            color: white;
        }

        .container {
            max-width: 850px;
            margin: 0 auto;
            background: var(--card);
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            /* overflow: hidden; Removed to allow sticky header */
            border-top: 5px solid var(--primary);
        }

        header {
            background: #fff;
            padding: 20px;
            text-align: center;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        header h1 {
            margin: 0;
            font-size: 1.5rem;
            color: var(--primary);
        }

        .subtitle {
            font-size: 0.95rem;
            color: #666;
            margin-top: 5px;
        }

        .btn-info-link {
            background: none;
            border: none;
            color: var(--accent);
            cursor: pointer;
            font-size: 0.9rem;
            text-decoration: underline;
            margin-top: 10px;
            display: inline-block;
        }

        .btn-main {
            transition: all 0.3s ease;
            background: var(--primary);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 25px;
            font-size: 1rem;
            cursor: pointer;
            transition: 0.2s;
            font-weight: 600;
            width: 100%;
            max-width: 280px;
            margin-top: 10px;
        }

        .btn-main:hover {
            background: #0056b3;
            transform: translateY(-2px);
        }

        .content {
            padding: 25px;
            scroll-margin-top: 280px;
        }



        /* Guide & Footer */
        #section-guide {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 2px solid #eee;
            display: none;
        }

        h2.guide-title {
            color: var(--primary);
            margin-bottom: 20px;
            text-align: center;
            scroll-margin-top: 280px;
            /* Offset for sticky header */
        }

        .guide-check-promo {
            text-align: center;
            background: #e3f2fd;
            color: #0d47a1;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 25px;
            font-size: 1.05rem;
            border: 1px solid #bbdefb;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
        }

        h3.step-title {
            color: var(--accent);
            margin-top: 30px;
            margin-bottom: 15px;
        }

        .checklist-item {
            display: block;
            padding: 15px;
            border-bottom: 1px solid #eee;
            cursor: pointer;
            background: #fff;
            border-radius: 6px;
            margin-bottom: 8px;
            border: 1px solid #eee;
        }

        .item-header {
            display: flex;
            align-items: flex-start;
        }

        .item-header input {
            transform: scale(1.3);
            margin: 5px 15px 5px 15px;
            cursor: pointer;
        }

        body[dir="ltr"] .item-header input {
            margin: 5px 15px 5px 0;
        }

        .checklist-item.completed .item-header {
            text-decoration: line-through;
            color: #aaa;
            opacity: 0.8;
        }

        .toggle-link {
            color: var(--primary);
            text-decoration: underline;
            cursor: pointer;
            font-weight: bold;
            font-size: 0.9rem;
            display: block;
            margin-top: 5px;
        }

        .hidden-info-content {
            display: none;
            margin-top: 10px;
            padding-top: 10px;
            border-top: 1px dashed #ccc;
            font-size: 0.9rem;
        }

        .troubleshoot-box {
            background-color: #fff3cd;
            color: #856404;
            padding: 15px;
            border-radius: 5px;
            margin-top: 10px;
            font-size: 0.9rem;
            border: 1px solid #ffeeba;
            display: none;
            cursor: default;
        }

        .btn-download {
            display: inline-block;
            background: var(--accent);
            color: white;
            padding: 8px 15px;
            text-decoration: none;
            border-radius: 6px;
            font-weight: bold;
            margin-top: 5px;
            font-size: 0.9rem;
        }

        details {
            margin-bottom: 10px;
            border: 1px solid #eee;
            border-radius: 8px;
            overflow: hidden;
            background: #fff;
        }

        summary {
            padding: 15px;
            background: #f8f9fa;
            cursor: pointer;
            font-weight: bold;
            color: var(--primary);
        }

        .faq-answer {
            padding: 15px;
            background: #fff;
            border-top: 1px solid #eee;
        }

        .video-container {
            position: relative;
            width: 100%;
            padding-bottom: 56.25%;
            height: 0;
            background: #000;
            border-radius: 8px;
            overflow: hidden;
            margin-top: 20px;
        }

        .video-container iframe,
        .video-container video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border: 0;
            object-fit: contain;
        }

        .community-section {
            background: #eef4ff;
            border: 1px solid #d0d7de;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            margin-top: 40px;
        }

        .copyright {
            text-align: center;
            font-size: 1rem;
            color: #000;
            margin-top: 30px;
        }

        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: 999;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
        }

        .modal-content {
            background: #fff;
            margin: 5% auto;
            padding: 25px;
            border-radius: 12px;
            width: 90%;
            max-width: 550px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            max-height: 85vh;
            overflow-y: auto;
        }

        .close-modal {
            float: left;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            color: #aaa;
        }

        .close-modal:hover {
            color: #000;
        }

        body[dir="ltr"] .close-modal {
            float: right;
        }

        .about-section {
            margin-bottom: 25px;
            text-align: start;
        }

        .about-section h3 {
            font-size: 1.1rem;
            color: var(--primary);
            margin-bottom: 8px;
            border-bottom: 1px solid #eee;
            padding-bottom: 5px;
        }

        .about-section p {
            font-size: 0.95rem;
            margin: 0 0 10px 0;
            color: #555;
        }

        .about-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .about-list li {
            margin-bottom: 8px;
            padding-inline-start: 15px;
            position: relative;
            font-size: 0.9rem;
            color: #444;
        }

        .about-list li::before {
            content: "•";
            color: var(--accent);
            font-weight: bold;
            display: inline-block;
            width: 1em;
            margin-inline-start: -1em;
        }


        /* Promo / Ad Style for Header Link */
        .header-promo {
            background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 100%);
            border: 1px solid #cce5ff;
            border-radius: 12px;
            padding: 15px;
            margin-top: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            box-shadow: 0 4px 12px rgba(0, 107, 229, 0.08);
            position: relative;
            overflow: hidden;
        }

        .header-promo::before {
            position: absolute;
            top: 10px;
            right: 15px;
            font-size: 1.2rem;
            opacity: 0.5;
        }

        .promo-text {
            font-size: 0.95rem;
            color: #444;
            margin-bottom: 12px;
            font-weight: 500;
        }

        .btn-promo {
            background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
            color: white;
            text-decoration: none;
            padding: 10px 24px;
            border-radius: 25px;
            font-weight: bold;
            font-size: 0.95rem;
            box-shadow: 0 4px 15px rgba(0, 107, 229, 0.3);
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-promo:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 107, 229, 0.4);
            filter: brightness(1.1);
        }