/* ===== 全局重置 & 字体 ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --bg-primary: #0b0e1a;
            --bg-secondary: #11162b;
            --bg-card: rgba(255, 255, 255, 0.04);
            --bg-card-hover: rgba(255, 255, 255, 0.08);
            --border-glass: rgba(255, 255, 255, 0.06);
            --text-primary: #ffffff;
            --text-secondary: rgba(255, 255, 255, 0.75);
            --text-muted: rgba(255, 255, 255, 0.45);
            --accent-blue: #4f8cff;
            --accent-purple: #7c5cfc;
            --accent-glow: rgba(79, 140, 255, 0.25);
            --gradient-main: linear-gradient(135deg, #4f8cff 0%, #7c5cfc 100%);
            --gradient-hero: linear-gradient(160deg, #0b0e1a 0%, #141a33 40%, #1a1040 100%);
            --shadow-btn: 0 12px 40px rgba(79, 140, 255, 0.35);
            --radius-lg: 24px;
            --radius-md: 16px;
            --radius-sm: 10px;
            --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-family);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            outline: none;
        }

        img {
            display: block;
            max-width: 100%;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-primary);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--accent-blue);
            border-radius: 10px;
        }

        /* ===== 导航栏 ===== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 16px 0;
            background: rgba(11, 14, 26, 0.72);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #fff;
        }

        .nav-logo svg {
            flex-shrink: 0;
        }

        .nav-logo span {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            letter-spacing: 0.3px;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-main);
            border-radius: 4px;
            transition: var(--transition);
        }

        .nav-links a:hover {
            color: #fff;
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 24px;
            border-radius: 60px;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--gradient-main);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 48px rgba(79, 140, 255, 0.45);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.16);
            transform: translateY(-2px);
        }

        .btn-large {
            padding: 16px 44px;
            font-size: 17px;
            border-radius: 60px;
        }

        .btn-large .btn-icon {
            margin-right: 10px;
            font-size: 20px;
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            padding: 4px;
        }

        .menu-toggle span {
            display: block;
            width: 26px;
            height: 2px;
            background: #fff;
            border-radius: 4px;
            transition: var(--transition);
        }

        /* ===== 英雄区 ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 120px 0 80px;
            background: var(--gradient-hero);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(79, 140, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(124, 92, 252, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .hero-content {
            max-width: 600px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(79, 140, 255, 0.12);
            border: 1px solid rgba(79, 140, 255, 0.2);
            padding: 6px 16px 6px 10px;
            border-radius: 60px;
            font-size: 13px;
            font-weight: 500;
            color: var(--accent-blue);
            margin-bottom: 28px;
            letter-spacing: 0.5px;
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: #4ade80;
            border-radius: 50%;
            display: inline-block;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(0.8);
            }
        }

        .hero h1 {
            font-size: clamp(42px, 5.5vw, 68px);
            font-weight: 800;
            line-height: 1.08;
            letter-spacing: -1.5px;
            margin-bottom: 20px;
        }

        .hero h1 .highlight {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 480px;
            margin-bottom: 36px;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-actions .btn-primary {
            box-shadow: 0 16px 48px rgba(79, 140, 255, 0.4);
        }

        .hero-actions .btn-secondary {
            background: rgba(255, 255, 255, 0.06);
        }

        .hero-stats {
            display: flex;
            gap: 48px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .hero-stats .stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stats .stat-number {
            font-size: 28px;
            font-weight: 700;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-stats .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 2px;
        }

        /* 英雄区右侧 · 视觉展示 */
        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .hero-phone {
            width: 100%;
            max-width: 420px;
            aspect-ratio: 9 / 19;
            background: linear-gradient(145deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.01));
            border-radius: 44px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            padding: 16px;
            box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(8px);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            position: relative;
        }

        .hero-phone .mock-ui {
            width: 100%;
            height: 100%;
            border-radius: 28px;
            background: rgba(255, 255, 255, 0.03);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
            gap: 12px;
        }

        .hero-phone .mock-ui .mock-avatar {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: var(--gradient-main);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            font-weight: 700;
            color: #fff;
            box-shadow: 0 8px 24px rgba(79, 140, 255, 0.3);
        }

        .hero-phone .mock-ui .mock-name {
            font-size: 18px;
            font-weight: 600;
            margin-top: 4px;
        }

        .hero-phone .mock-ui .mock-msg {
            font-size: 14px;
            color: var(--text-secondary);
            max-width: 200px;
            line-height: 1.5;
        }

        .hero-phone .mock-ui .mock-bubbles {
            display: flex;
            flex-direction: column;
            gap: 8px;
            width: 100%;
            margin-top: 8px;
        }

        .hero-phone .mock-ui .mock-bubble {
            padding: 10px 14px;
            border-radius: 16px;
            font-size: 13px;
            max-width: 80%;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-secondary);
            align-self: flex-start;
        }

        .hero-phone .mock-ui .mock-bubble.sent {
            align-self: flex-end;
            background: rgba(79, 140, 255, 0.2);
            color: #fff;
        }

        /* 浮动装饰 */
        .float-orb {
            position: absolute;
            border-radius: 50%;
            pointer-events: none;
            filter: blur(60px);
            opacity: 0.3;
        }

        .float-orb.orb1 {
            width: 200px;
            height: 200px;
            background: var(--accent-blue);
            top: -40px;
            right: -40px;
        }

        .float-orb.orb2 {
            width: 160px;
            height: 160px;
            background: var(--accent-purple);
            bottom: -30px;
            left: -30px;
        }

        /* ===== 通用 Section ===== */
        .section {
            padding: 100px 0;
        }

        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }

        .section-header .tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-blue);
            background: rgba(79, 140, 255, 0.1);
            padding: 4px 16px;
            border-radius: 60px;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-header h2 {
            font-size: clamp(32px, 3.6vw, 44px);
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
        }

        .section-header p {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== 功能特点 ===== */
        #features {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 28px;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            transition: var(--transition);
            backdrop-filter: blur(4px);
        }

        .feature-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-6px);
            border-color: rgba(79, 140, 255, 0.15);
        }

        .feature-card .icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(79, 140, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            margin-bottom: 18px;
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== 关于 QuickQ ===== */
        #about {
            background: var(--bg-primary);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-text h2 {
            font-size: clamp(30px, 3.2vw, 40px);
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }

        .about-text h2 .highlight {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .about-text p {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .about-text ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .about-text ul li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 15px;
            color: var(--text-secondary);
        }

        .about-text ul li .check {
            color: var(--accent-blue);
            font-weight: 700;
            font-size: 18px;
        }

        .about-visual {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .about-visual .card-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            width: 100%;
            max-width: 440px;
        }

        .about-visual .card-grid .mini-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: center;
            transition: var(--transition);
        }

        .about-visual .card-grid .mini-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-4px);
        }

        .about-visual .card-grid .mini-card .num {
            font-size: 32px;
            font-weight: 700;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .about-visual .card-grid .mini-card .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== 下载区 ===== */
        #download {
            background: var(--gradient-hero);
            border-top: 1px solid var(--border-glass);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        #download::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(79, 140, 255, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        #download .container {
            position: relative;
            z-index: 2;
        }

        #download .section-header h2 {
            font-size: clamp(34px, 4vw, 48px);
        }

        .download-actions {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 12px;
        }

        .download-actions .btn-primary {
            box-shadow: 0 16px 56px rgba(79, 140, 255, 0.45);
            padding: 18px 52px;
            font-size: 18px;
        }

        .download-actions .btn-primary:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 24px 64px rgba(79, 140, 255, 0.55);
        }

        .download-actions .btn-secondary {
            padding: 18px 40px;
            font-size: 16px;
        }

        .download-platforms {
            display: flex;
            justify-content: center;
            gap: 32px;
            margin-top: 40px;
            flex-wrap: wrap;
        }

        .download-platforms .platform {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .download-platforms .platform:hover {
            color: var(--text-primary);
        }

        .download-platforms .platform svg {
            opacity: 0.5;
            transition: var(--transition);
        }

        .download-platforms .platform:hover svg {
            opacity: 1;
        }

        /* ===== 页脚 ===== */
        .footer {
            padding: 48px 0 32px;
            border-top: 1px solid var(--border-glass);
            background: var(--bg-primary);
        }

        .footer .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 600;
        }

        .footer .footer-brand span {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer .footer-links {
            display: flex;
            gap: 24px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .footer .footer-links a:hover {
            color: var(--text-primary);
        }

        .footer .footer-copy {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                text-align: center;
            }

            .hero-content {
                max-width: 100%;
            }

            .hero p {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }

            .hero-actions {
                justify-content: center;
            }

            .hero-stats {
                justify-content: center;
            }

            .hero-visual {
                order: -1;
            }

            .hero-phone {
                max-width: 300px;
            }

            .about-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }

            .about-text ul {
                align-items: center;
            }

            .about-visual .card-grid {
                max-width: 360px;
                margin: 0 auto;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                flex-direction: column;
                background: rgba(11, 14, 26, 0.96);
                backdrop-filter: blur(20px);
                padding: 24px;
                gap: 18px;
                border-bottom: 1px solid var(--border-glass);
            }

            .nav-links.open {
                display: flex;
            }

            .menu-toggle {
                display: flex;
            }

            .nav-actions .btn-secondary {
                display: none;
            }

            .hero h1 {
                font-size: 34px;
            }

            .hero-stats {
                gap: 28px;
                flex-wrap: wrap;
                justify-content: center;
            }

            .hero-stats .stat-number {
                font-size: 22px;
            }

            .features-grid {
                grid-template-columns: 1fr;
                max-width: 420px;
                margin: 0 auto;
            }

            .download-actions {
                flex-direction: column;
                align-items: center;
            }

            .download-actions .btn {
                width: 100%;
                max-width: 320px;
            }

            .footer .container {
                flex-direction: column;
                text-align: center;
                gap: 16px;
            }

            .footer .footer-links {
                flex-wrap: wrap;
                justify-content: center;
            }

            .section {
                padding: 60px 0;
            }

            .hero {
                padding: 100px 0 60px;
                min-height: auto;
            }

            .about-visual .card-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
        }

        @media (max-width: 480px) {
            .hero-phone {
                max-width: 240px;
                border-radius: 32px;
                padding: 12px;
            }

            .hero-phone .mock-ui .mock-avatar {
                width: 56px;
                height: 56px;
                font-size: 24px;
            }

            .hero-phone .mock-ui .mock-name {
                font-size: 15px;
            }

            .hero-phone .mock-ui .mock-msg {
                font-size: 12px;
            }

            .hero-phone .mock-ui .mock-bubble {
                font-size: 11px;
                padding: 6px 10px;
            }

            .about-visual .card-grid {
                grid-template-columns: 1fr 1fr;
            }

            .about-visual .card-grid .mini-card {
                padding: 16px 12px;
            }

            .about-visual .card-grid .mini-card .num {
                font-size: 24px;
            }
        }