* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', Oxygen, Ubuntu, sans-serif;
        }
        
        body {
            background: #f5f7fc;
            color: #1a2634;
            line-height: 1.5;
        }
        
        /* Smart Header - Non Sticky, Clean, International */
        .smart-header {
            background: #ffffff;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            position: relative;
            z-index: 100;
        }
        .header-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 20px 32px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .logo-icon {
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, #FF5959, #ff8c42);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 6px 14px rgba(255,89,89,0.2);
            transition: transform 0.2s;
        }
        .logo-icon:hover {
            transform: scale(1.02);
        }
        .logo-icon i {
            font-size: 24px;
            color: white;
        }
        .logo-text h1 {
            font-size: 24px;
            font-weight: 800;
            background: linear-gradient(135deg, #FF5959, #ff8c42);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.3px;
        }
        .logo-text p {
            font-size: 11px;
            color: #6c7a89;
            font-weight: 500;
            letter-spacing: 0.5px;
        }
        .main-nav {
            display: flex;
            gap: 36px;
            align-items: center;
            flex-wrap: wrap;
        }
        .main-nav a {
            text-decoration: none;
            color: #2c3e50;
            font-weight: 600;
            font-size: 15px;
            transition: 0.2s;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a i {
            font-size: 14px;
            color: #FF5959;
            opacity: 0.7;
        }
        .main-nav a:hover {
            color: #FF5959;
        }
        .lang-switch {
            background: #f0f2f5;
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 13px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: default;
            color: #2c3e50;
        }
        
        /* Smart Hero Banner - Direct, International, Compact */
        .hero-smart {
            background: linear-gradient(115deg, #ffffff 0%, #fafcff 100%);
            padding: 70px 32px 60px;
            border-bottom: 1px solid rgba(255,89,89,0.1);
        }
        .hero-smart-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 48px;
        }
        .hero-content {
            flex: 1;
            min-width: 300px;
        }
        .hero-badge-smart {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,89,89,0.1);
            padding: 6px 16px;
            border-radius: 40px;
            color: #FF5959;
            font-weight: 700;
            font-size: 13px;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
        }
        .hero-content h1 {
            font-size: 56px;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            color: #1a2a3a;
            letter-spacing: -1px;
        }
        .hero-content h1 span {
            background: linear-gradient(135deg, #FF5959, #ff8c42);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-description {
            font-size: 18px;
            color: #5a6e7c;
            line-height: 1.6;
            margin-bottom: 32px;
            max-width: 550px;
        }
        .hero-stats-smart {
            display: flex;
            gap: 32px;
            margin-bottom: 32px;
            flex-wrap: wrap;
        }
        .stat-smart {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .stat-smart i {
            font-size: 24px;
            color: #FF5959;
        }
        .stat-smart strong {
            font-size: 20px;
            font-weight: 800;
            color: #1a2a3a;
        }
        .stat-smart span {
            font-size: 13px;
            color: #7f8c8d;
            font-weight: 500;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-hero-primary {
            background: #FF5959;
            border: none;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 15px;
            cursor: pointer;
            transition: all 0.25s;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: white;
            box-shadow: 0 4px 12px rgba(255,89,89,0.25);
        }
        .btn-hero-primary:hover {
            background: #ff4444;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255,89,89,0.3);
        }
        .btn-hero-secondary {
            background: white;
            border: 1.5px solid #e2e8f0;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 15px;
            cursor: pointer;
            transition: all 0.25s;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: #2c3e50;
        }
        .btn-hero-secondary:hover {
            border-color: #FF5959;
            background: #fff5f5;
            transform: translateY(-2px);
        }
        .hero-visual {
            flex: 0.8;
            min-width: 280px;
            text-align: center;
        }
        .hero-visual .visual-card {
            background: linear-gradient(145deg, #ffffff, #f8fafc);
            border-radius: 32px;
            padding: 32px 24px;
            box-shadow: 0 20px 40px -12px rgba(0,0,0,0.1);
            border: 1px solid rgba(255,89,89,0.15);
        }
        .hero-visual i {
            font-size: 64px;
            color: #FF5959;
            margin-bottom: 20px;
        }
        .hero-visual h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .hero-visual p {
            font-size: 14px;
            color: #7f8c8d;
        }
        
        /* Tool Container */
        .tool-container {
            max-width: 1200px;
            margin: 50px auto 70px;
            padding: 0 24px;
        }
        .converter-card {
            background: white;
            border-radius: 28px;
            box-shadow: 0 20px 40px -12px rgba(0,0,0,0.12);
            overflow: hidden;
            border: 1px solid rgba(255,89,89,0.1);
        }
        .tool-header-bar {
            background: linear-gradient(135deg, #FF5959, #ff7b4a);
            padding: 18px 28px;
            color: white;
            font-weight: 700;
            font-size: 17px;
        }
        .tool-panel {
            display: none;
            padding: 28px;
        }
        .tool-panel.active-tool-panel { display: block; }
        .upload-area-modern {
            border: 2px dashed #e0e6ed;
            border-radius: 24px;
            padding: 40px 28px;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s;
            background: #fefcfc;
        }
        .upload-area-modern:hover, .upload-area-modern.drag-over {
            border-color: #FF5959;
            background: #fff9f9;
        }
        .upload-area-modern i {
            font-size: 52px;
            color: #FF5959;
            margin-bottom: 14px;
        }
        .preview-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            gap: 12px;
            max-height: 280px;
            overflow-y: auto;
            padding: 16px;
            background: #f9fafc;
            border-radius: 20px;
            margin-top: 20px;
        }
        .preview-item {
            background: white;
            border-radius: 14px;
            padding: 8px;
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
            border: 2px solid transparent;
            transition: all 0.2s;
        }
        .preview-item:hover {
            border-color: #FF5959;
            transform: translateY(-3px);
        }
        .preview-item img {
            width: 100%;
            height: 90px;
            object-fit: contain;
        }
        .controls-row {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin: 20px 0;
            align-items: center;
        }
        .btn-convert {
            background: #FF5959;
            border: none;
            padding: 12px 28px;
            border-radius: 40px;
            color: white;
            font-weight: 700;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-convert:hover { background: #ff4444; transform: translateY(-2px); }
        .btn-secondary {
            background: #e2e8f0;
            border: none;
            padding: 12px 28px;
            border-radius: 40px;
            color: #2c3e50;
            font-weight: 700;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-secondary:hover { background: #cbd5e1; }
        .progress-bar {
            width: 100%;
            height: 5px;
            background: #e2e8f0;
            border-radius: 3px;
            margin-top: 12px;
            overflow: hidden;
        }
        .progress-fill {
            height: 100%;
            background: linear-gradient(to right, #FF5959, #ff8c42);
            width: 0%;
            transition: width 0.3s;
        }
        .loading-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.7);
            z-index: 10000;
            justify-content: center;
            align-items: center;
        }
        .loading-content {
            background: white;
            padding: 40px;
            border-radius: 28px;
            text-align: center;
        }
        .spinner {
            border: 4px solid #f1f5f9;
            border-top: 4px solid #FF5959;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }
        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
        select, input[type="range"] {
            padding: 10px 16px;
            border: 1px solid #e0e6ed;
            border-radius: 12px;
            background: white;
            font-size: 14px;
        }
        
        /* How To Section */
        .howto-section {
            background: #ffffff;
            padding: 70px 32px;
        }
        .howto-container {
            max-width: 1280px;
            margin: 0 auto;
        }
        .section-badge {
            text-align: center;
            margin-bottom: 16px;
        }
        .section-badge span {
            display: inline-block;
            background: rgba(255,89,89,0.1);
            padding: 5px 18px;
            border-radius: 40px;
            color: #FF5959;
            font-weight: 600;
            font-size: 13px;
        }
        .section-title {
            text-align: center;
            font-size: 38px;
            font-weight: 800;
            margin-bottom: 18px;
            color: #1e2a3a;
        }
        .section-title span { color: #FF5959; }
        .section-sub {
            text-align: center;
            color: #6c7a89;
            max-width: 680px;
            margin: 0 auto 50px;
            font-size: 17px;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
        }
        .step-card {
            background: #fafcff;
            border-radius: 24px;
            padding: 36px 24px;
            text-align: center;
            transition: all 0.3s;
            border: 1px solid #edf2f7;
        }
        .step-card:hover {
            transform: translateY(-5px);
            border-color: #FF5959;
            box-shadow: 0 15px 30px -10px rgba(255,89,89,0.1);
        }
        .step-icon {
            width: 70px;
            height: 70px;
            background: rgba(255,89,89,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        .step-icon i {
            font-size: 32px;
            color: #FF5959;
        }
        .step-card h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .step-card p {
            color: #5a6e7c;
            line-height: 1.6;
        }
        
        /* Features Section */
        .features-section {
            background: #f8fafd;
            padding: 70px 32px;
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 28px;
            max-width: 1280px;
            margin: 0 auto;
        }
        .feature-card {
            background: white;
            border-radius: 24px;
            padding: 28px;
            transition: 0.25s;
            border: 1px solid #edf2f7;
        }
        .feature-card:hover {
            border-color: #FF5959;
            transform: translateY(-3px);
        }
        .feature-icon-large {
            width: 56px;
            height: 56px;
            background: rgba(255,89,89,0.1);
            border-radius: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .feature-icon-large i {
            font-size: 28px;
            color: #FF5959;
        }
        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .feature-card p {
            color: #5a6e7c;
            line-height: 1.6;
        }
        
        /* FAQ Accordion */
        .faq-section {
            background: #ffffff;
            padding: 70px 32px;
        }
        .faq-container {
            max-width: 900px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fafcff;
            border-radius: 20px;
            margin-bottom: 14px;
            overflow: hidden;
            border: 1px solid #eef2f8;
        }
        .faq-question {
            padding: 20px 26px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 700;
            font-size: 17px;
            color: #1e2a3a;
            transition: background 0.2s;
        }
        .faq-question:hover {
            background: #fff5f5;
        }
        .faq-question i {
            color: #FF5959;
            font-size: 18px;
            transition: transform 0.3s;
        }
        .faq-answer {
            max-height: 0;
            padding: 0 26px;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.3s;
            color: #5a6e7c;
            line-height: 1.6;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 0 26px 22px 26px;
            border-top: 1px solid #eef2f8;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        
        /* Premium Footer */
        .premium-footer {
            background: #0f172a;
            padding: 55px 32px 30px;
            color: #cbd5e6;
        }
        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
        }
        .footer-top {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 40px;
            margin-bottom: 45px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            padding-bottom: 45px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 18px;
        }
        .footer-logo-icon {
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, #FF5959, #ff8c42);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .footer-logo-icon i {
            font-size: 22px;
            color: white;
        }
        .footer-logo-text h3 {
            font-size: 20px;
            font-weight: 800;
            background: linear-gradient(135deg, #FF5959, #ff8c42);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .footer-desc {
            font-size: 13px;
            line-height: 1.6;
            color: #94a3b8;
            margin-top: 12px;
        }
        .footer-links h4, .footer-contact h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 18px;
            color: white;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links ul li {
            margin-bottom: 10px;
        }
        .footer-links ul li a {
            color: #94a3b8;
            text-decoration: none;
            transition: 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
        }
        .footer-links ul li a:hover {
            color: #FF5959;
            transform: translateX(4px);
        }
        .footer-contact p {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            font-size: 13px;
            color: #94a3b8;
        }
        .footer-contact i {
            width: 22px;
            color: #FF5959;
        }
        .social-icons {
            display: flex;
            gap: 14px;
            margin-top: 18px;
        }
        .social-icons a {
            width: 36px;
            height: 36px;
            background: rgba(255,255,255,0.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            transition: 0.2s;
        }
        .social-icons a:hover {
            background: #FF5959;
            transform: translateY(-2px);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            font-size: 12px;
            color: #64748b;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        @media (max-width: 768px) {
            .hero-content h1 { font-size: 38px; }
            .hero-smart-container { flex-direction: column; text-align: center; }
            .hero-stats-smart { justify-content: center; }
            .hero-buttons { justify-content: center; }
            .section-title { font-size: 30px; }
        }