/* ===== CSS Reset & Base ===== */
        *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --primary: #ff4757;
            --primary-dark: #e84118;
            --secondary: #2ed573;
            --accent: #ffa502;
            --bg: #0a0a0a;
            --bg-light: #1a1a2e;
            --bg-card: #16213e;
            --text: #f1f2f6;
            --text-muted: #a4b0be;
            --border: rgba(255,255,255,0.08);
            --shadow: 0 8px 32px rgba(0,0,0,0.4);
            --glow: 0 0 20px rgba(255,71,87,0.3);
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }
        img { max-width: 100%; display: block; }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }
        @keyframes glow {
            0%, 100% { box-shadow: 0 0 20px rgba(255,71,87,0.3); }
            50% { box-shadow: 0 0 40px rgba(255,71,87,0.6); }
        }
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }
        @keyframes shimmer {
            0% { background-position: -200% 0; }
            100% { background-position: 200% 0; }
        }
        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }
        .animate { animation: fadeInUp 0.8s ease forwards; opacity: 0; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }
        .delay-4 { animation-delay: 0.4s; }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            background: rgba(10,10,10,0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            transition: all 0.3s ease;
        }
        .nav {
            max-width: 1200px; margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
            padding: 0 20px; height: 64px;
        }
        .logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.4rem; font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo-icon {
            width: 36px; height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 10px; display: flex; align-items: center; justify-content: center;
            font-size: 1.2rem; color: #fff; -webkit-text-fill-color: #fff;
        }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a {
            color: var(--text-muted); font-size: 0.95rem; font-weight: 500;
            transition: color 0.3s; position: relative;
        }
        .nav-links a:hover { color: var(--primary); }
        .nav-links a::after {
            content: ''; position: absolute; bottom: -4px; left: 0;
            width: 0; height: 2px; background: var(--primary);
            transition: width 0.3s;
        }
        .nav-links a:hover::after { width: 100%; }
        .nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff; padding: 8px 24px; border-radius: 50px;
            font-weight: 600; font-size: 0.9rem;
            box-shadow: var(--glow); transition: all 0.3s;
        }
        .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(255,71,87,0.5); }
        .mobile-menu-btn {
            display: none; flex-direction: column; gap: 5px;
            background: none; border: none; cursor: pointer; padding: 5px;
        }
        .mobile-menu-btn span {
            display: block; width: 24px; height: 2px;
            background: var(--text); transition: all 0.3s;
        }

        /* ===== Hero Section ===== */
        .hero {
            min-height: 100vh; display: flex; align-items: center;
            padding: 100px 20px 60px; position: relative; overflow: hidden;
            background: 
                radial-gradient(ellipse at 20% 50%, rgba(255,71,87,0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(46,213,115,0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(255,165,2,0.08) 0%, transparent 50%);
        }
        .hero::before {
            content: ''; position: absolute; inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.5;
        }
        .hero-container {
            max-width: 1200px; margin: 0 auto;
            display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
            align-items: center; position: relative; z-index: 1;
        }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            background: rgba(255,71,87,0.15); border: 1px solid rgba(255,71,87,0.3);
            color: var(--primary); padding: 6px 16px; border-radius: 50px;
            font-size: 0.85rem; font-weight: 600; margin-bottom: 20px;
        }
        .hero-badge::before {
            content: ''; width: 8px; height: 8px; background: var(--secondary);
            border-radius: 50%; animation: pulse 2s infinite;
        }
        .hero h1 {
            font-size: 3.2rem; font-weight: 900; line-height: 1.1;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 0%, #a4b0be 100%);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero h1 span {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 1.15rem; color: var(--text-muted);
            margin-bottom: 30px; max-width: 500px;
        }
        .hero-stats {
            display: flex; gap: 30px; margin-bottom: 35px;
        }
        .stat-item { text-align: center; }
        .stat-num {
            font-size: 2rem; font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
        .hero-btns { display: flex; gap: 15px; flex-wrap: wrap; }
        .btn {
            display: inline-flex; align-items: center; gap: 10px;
            padding: 14px 32px; border-radius: 12px; font-weight: 700;
            font-size: 1rem; transition: all 0.3s; border: none; cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff; box-shadow: var(--glow); animation: glow 3s infinite;
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 40px rgba(255,71,87,0.4); }
        .btn-outline {
            background: transparent; color: var(--text);
            border: 2px solid rgba(255,255,255,0.2);
        }
        .btn-outline:hover { border-color: var(--primary); color: var(--primary); }

        /* Hero Image / Phone Mockup */
        .hero-visual {
            position: relative; display: flex; justify-content: center;
        }
        .phone-mockup {
            width: 280px; height: 560px;
            background: linear-gradient(145deg, #1a1a2e, #0f0f23);
            border-radius: 40px; border: 3px solid rgba(255,255,255,0.1);
            box-shadow: 0 25px 80px rgba(0,0,0,0.6), inset 0 0 60px rgba(255,71,87,0.1);
            position: relative; overflow: hidden; animation: float 6s ease-in-out infinite;
        }
        .phone-screen {
            position: absolute; inset: 12px; border-radius: 32px;
            background: linear-gradient(180deg, #16213e 0%, #0a0a0a 100%);
            overflow: hidden; display: flex; flex-direction: column;
        }
        .phone-notch {
            width: 120px; height: 24px; background: #0a0a0a;
            border-radius: 0 0 16px 16px; margin: 0 auto;
        }
        .phone-content {
            flex: 1; padding: 20px; display: flex; flex-direction: column; gap: 12px;
        }
        .phone-header {
            display: flex; justify-content: space-between; align-items: center;
        }
        .phone-title { font-size: 0.75rem; font-weight: 700; color: var(--primary); }
        .phone-status { font-size: 0.65rem; color: var(--secondary); }
        .phone-map {
            flex: 1; background: rgba(255,255,255,0.03); border-radius: 12px;
            position: relative; overflow: hidden;
        }
        .map-grid {
            position: absolute; inset: 0;
            background-image: 
                linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 20px 20px;
        }
        .map-dot {
            position: absolute; width: 8px; height: 8px; border-radius: 50%;
            background: var(--primary); box-shadow: 0 0 10px var(--primary);
        }
        .map-dot:nth-child(2) { top: 30%; left: 40%; }
        .map-dot:nth-child(3) { top: 50%; left: 70%; background: var(--secondary); box-shadow: 0 0 10px var(--secondary); }
        .map-dot:nth-child(4) { top: 70%; left: 25%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
        .map-player {
            position: absolute; top: 45%; left: 50%; transform: translate(-50%, -50%);
            width: 16px; height: 16px; background: #fff; border-radius: 50%;
            box-shadow: 0 0 20px #fff; animation: pulse 2s infinite;
        }
        .phone-features {
            display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
        }
        .phone-feature {
            background: rgba(255,71,87,0.1); border: 1px solid rgba(255,71,87,0.2);
            border-radius: 8px; padding: 8px; text-align: center;
            font-size: 0.7rem; color: var(--text-muted);
        }
        .phone-feature.active { background: rgba(46,213,115,0.1); border-color: rgba(46,213,115,0.3); color: var(--secondary); }

        /* ===== Section Common ===== */
        .section {
            padding: 100px 20px; position: relative;
        }
        .section-header {
            text-align: center; max-width: 600px; margin: 0 auto 60px;
        }
        .section-tag {
            display: inline-block; background: rgba(255,71,87,0.1);
            color: var(--primary); padding: 6px 16px; border-radius: 50px;
            font-size: 0.85rem; font-weight: 600; margin-bottom: 16px;
            border: 1px solid rgba(255,71,87,0.2);
        }
        .section-title {
            font-size: 2.5rem; font-weight: 800; margin-bottom: 16px;
            background: linear-gradient(135deg, #fff, #a4b0be);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-desc { color: var(--text-muted); font-size: 1.1rem; }

        /* ===== Download Section ===== */
        .download-section { background: var(--bg-light); }
        .download-grid {
            max-width: 1200px; margin: 0 auto;
            display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px;
        }
        .download-card {
            background: var(--bg-card); border: 1px solid var(--border);
            border-radius: 20px; padding: 40px 30px; text-align: center;
            transition: all 0.4s; position: relative; overflow: hidden;
        }
        .download-card::before {
            content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            transform: scaleX(0); transition: transform 0.4s;
        }
        .download-card:hover::before { transform: scaleX(1); }
        .download-card:hover {
            transform: translateY(-8px); border-color: rgba(255,71,87,0.3);
            box-shadow: 0 20px 60px rgba(0,0,0,0.4);
        }
        .dl-icon {
            width: 70px; height: 70px; margin: 0 auto 20px;
            background: rgba(255,71,87,0.1); border-radius: 20px;
            display: flex; align-items: center; justify-content: center;
            font-size: 2rem;
        }
        .dl-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 10px; }
        .dl-desc { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 20px; }
        .dl-version {
            display: inline-block; background: rgba(46,213,115,0.1);
            color: var(--secondary); padding: 4px 12px; border-radius: 50px;
            font-size: 0.8rem; font-weight: 600; margin-bottom: 20px;
        }
        .dl-btn {
            display: inline-block; width: 100%; padding: 14px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff; border-radius: 12px; font-weight: 700;
            transition: all 0.3s; border: none; cursor: pointer;
        }
        .dl-btn:hover { transform: scale(1.02); box-shadow: var(--glow); }
        .dl-features { margin-top: 20px; text-align: left; }
        .dl-features li {
            display: flex; align-items: center; gap: 8px;
            padding: 6px 0; color: var(--text-muted); font-size: 0.85rem;
        }
        .dl-features li::before {
            content: '?'; color: var(--secondary); font-weight: 700;
        }

        /* ===== Features Section ===== */
        .features-grid {
            max-width: 1200px; margin: 0 auto;
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
        }
        .feature-card {
            background: var(--bg-card); border: 1px solid var(--border);
            border-radius: 16px; padding: 30px;
            transition: all 0.4s; position: relative; overflow: hidden;
        }
        .feature-card::after {
            content: ''; position: absolute; bottom: 0; right: 0;
            width: 100px; height: 100px;
            background: radial-gradient(circle, rgba(255,71,87,0.1) 0%, transparent 70%);
            border-radius: 50%; transform: translate(30%, 30%);
        }
        .feature-card:hover {
            transform: translateY(-5px); border-color: rgba(255,71,87,0.2);
            box-shadow: var(--shadow);
        }
        .feature-icon {
            width: 50px; height: 50px; border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.5rem; margin-bottom: 16px;
            background: rgba(255,71,87,0.1); color: var(--primary);
        }
        .feature-card:nth-child(2) .feature-icon { background: rgba(46,213,115,0.1); color: var(--secondary); }
        .feature-card:nth-child(3) .feature-icon { background: rgba(255,165,2,0.1); color: var(--accent); }
        .feature-card:nth-child(4) .feature-icon { background: rgba(112,161,255,0.1); color: #70a1ff; }
        .feature-card:nth-child(5) .feature-icon { background: rgba(255,71,87,0.1); color: var(--primary); }
        .feature-card:nth-child(6) .feature-icon { background: rgba(46,213,115,0.1); color: var(--secondary); }
        .feature-card:nth-child(7) .feature-icon { background: rgba(255,165,2,0.1); color: var(--accent); }
        .feature-card:nth-child(8) .feature-icon { background: rgba(112,161,255,0.1); color: #70a1ff; }
        .feature-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .feature-desc { color: var(--text-muted); font-size: 0.9rem; line-height: 1.5; }

        /* ===== Tutorial Section ===== */
        .tutorial-section { background: var(--bg-light); }
        .tutorial-grid {
            max-width: 1000px; margin: 0 auto;
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
        }
        .tutorial-step {
            text-align: center; position: relative;
        }
        .tutorial-step:not(:last-child)::after {
            content: ''; position: absolute; top: 35px; right: -50%;
            width: 100%; height: 2px;
            background: linear-gradient(90deg, var(--primary), transparent);
            opacity: 0.3;
        }
        .step-num {
            width: 70px; height: 70px; margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 50%; display: flex; align-items: center; justify-content: center;
            font-size: 1.5rem; font-weight: 800; color: #fff;
            box-shadow: var(--glow); position: relative; z-index: 1;
        }
        .step-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .step-desc { color: var(--text-muted); font-size: 0.9rem; }

        /* ===== FAQ Section ===== */
        .faq-container {
            max-width: 800px; margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card); border: 1px solid var(--border);
            border-radius: 16px; margin-bottom: 16px; overflow: hidden;
            transition: all 0.3s;
        }
        .faq-item:hover { border-color: rgba(255,71,87,0.2); }
        .faq-question {
            padding: 20px 24px; display: flex; justify-content: space-between; align-items: center;
            cursor: pointer; font-weight: 600;
        }
        .faq-question::after {
            content: '+'; font-size: 1.5rem; color: var(--primary);
            transition: transform 0.3s;
        }
        .faq-item.active .faq-question::after { transform: rotate(45deg); }
        .faq-answer {
            max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease;
            color: var(--text-muted); padding: 0 24px;
        }
        .faq-item.active .faq-answer {
            max-height: 200px; padding: 0 24px 20px;
        }

        /* ===== Stats Bar ===== */
        .stats-bar {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            padding: 60px 20px; position: relative; overflow: hidden;
        }
        .stats-bar::before {
            content: ''; position: absolute; inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
        }
        .stats-grid {
            max-width: 1200px; margin: 0 auto;
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px;
            position: relative; z-index: 1; text-align: center;
        }
        .stats-bar .stat-num { font-size: 2.5rem; font-weight: 800; color: #fff; -webkit-text-fill-color: #fff; }
        .stats-bar .stat-label { color: rgba(255,255,255,0.8); font-size: 0.95rem; margin-top: 8px; }

        /* ===== Footer ===== */
        .footer {
            background: #050508; border-top: 1px solid var(--border);
            padding: 60px 20px 30px;
        }
        .footer-grid {
            max-width: 1200px; margin: 0 auto;
            display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }
        .footer-title { font-size: 1rem; font-weight: 700; margin-bottom: 20px; color: #fff; }
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: var(--text-muted); font-size: 0.9rem; transition: color 0.3s; }
        .footer-links a:hover { color: var(--primary); }
        .footer-bottom {
            max-width: 1200px; margin: 0 auto;
            border-top: 1px solid var(--border); padding-top: 30px;
            display: flex; justify-content: space-between; align-items: center;
            color: var(--text-muted); font-size: 0.85rem;
        }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            width: 36px; height: 36px; border-radius: 50%;
            background: var(--bg-card); border: 1px solid var(--border);
            display: flex; align-items: center; justify-content: center;
            transition: all 0.3s; font-size: 0.9rem;
        }
        .footer-social a:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

        /* ===== Scroll to Top ===== */
        .scroll-top {
            position: fixed; bottom: 30px; right: 30px;
            width: 48px; height: 48px; border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff; border: none; cursor: pointer;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.2rem; box-shadow: var(--glow);
            opacity: 0; visibility: hidden; transition: all 0.3s; z-index: 999;
        }
        .scroll-top.visible { opacity: 1; visibility: visible; }
        .scroll-top:hover { transform: translateY(-3px); }

        /* ===== Mobile Menu ===== */
        .mobile-menu {
            position: fixed; inset: 0; background: rgba(10,10,10,0.98);
            z-index: 999; display: flex; flex-direction: column;
            align-items: center; justify-content: center; gap: 30px;
            opacity: 0; visibility: hidden; transition: all 0.3s;
        }
        .mobile-menu.active { opacity: 1; visibility: visible; }
        .mobile-menu a { font-size: 1.5rem; font-weight: 700; color: var(--text); }
        .mobile-menu a:hover { color: var(--primary); }
        .mobile-menu-close {
            position: absolute; top: 20px; right: 20px;
            background: none; border: none; color: var(--text);
            font-size: 2rem; cursor: pointer;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero-container { grid-template-columns: 1fr; text-align: center; }
            .hero h1 { font-size: 2.5rem; }
            .hero-desc { margin: 0 auto 30px; }
            .hero-stats { justify-content: center; }
            .hero-btns { justify-content: center; }
            .hero-visual { order: -1; margin-bottom: 40px; }
            .phone-mockup { width: 240px; height: 480px; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .nav-links, .nav-cta { display: none; }
            .mobile-menu-btn { display: flex; }
            .hero { padding: 100px 16px 40px; }
            .hero h1 { font-size: 2rem; }
            .section { padding: 60px 16px; }
            .section-title { font-size: 1.8rem; }
            .download-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .tutorial-grid { grid-template-columns: 1fr; }
            .tutorial-step:not(:last-child)::after { display: none; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
        }

        /* ===== Accessibility ===== */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
        }

        /* ===== Selection ===== */
        ::selection { background: rgba(255,71,87,0.3); color: #fff; }