@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
        html, body { max-width: 100%; overflow-x: hidden; }
        body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }

        /* ====== SVG 桌面端构建动画变量 ====== */
        /* opacity 修改: 当白色背景(--p-bg)填充时，外侧蓝色描边渐渐透明消失 */
        #svg-border { stroke-dasharray: 3000; stroke-dashoffset: calc(3000 - var(--p-border, 0) * 3000); opacity: calc(1 - var(--p-bg, 0) - var(--p-out, 0)); will-change: stroke-dashoffset, opacity; }
        #svg-bg { opacity: calc(var(--p-bg, 0) - var(--p-out, 0)); will-change: opacity; }
        #anim-sidebar { opacity: calc(var(--p-sidebar, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-sidebar, 0)) * -120px + var(--p-out, 0) * -120px)); will-change: transform, opacity; }
        #anim-header { opacity: calc(var(--p-header, 0) - var(--p-out, 0)); transform: translateY(calc((1 - var(--p-header, 0)) * -80px + var(--p-out, 0) * -80px)); will-change: transform, opacity; }
        #anim-msg1 { opacity: calc(var(--p-msg1, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-msg1, 0)) * 120px + var(--p-out, 0) * 120px)); will-change: transform, opacity; }
        #anim-msg2 { opacity: calc(var(--p-msg2, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-msg2, 0)) * -120px + var(--p-out, 0) * -120px)); will-change: transform, opacity; }
        #anim-msg3 { opacity: calc(var(--p-msg3, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-msg3, 0)) * -120px + var(--p-out, 0) * -120px)); will-change: transform, opacity; }
        #anim-input { opacity: calc(var(--p-input, 0) - var(--p-out, 0)); transform: translateY(calc((1 - var(--p-input, 0)) * 100px + var(--p-out, 0) * 100px)); will-change: transform, opacity; }
        #mac-bar { opacity: calc(var(--p-bg, 0) - var(--p-out, 0)); }

        /* ====== SVG 移动端构建动画变量 ====== */
        /* 移动端外侧蓝色线条同样在背景出现后消失 */
        #mob-border { stroke-dasharray: 2000; stroke-dashoffset: calc(2000 - var(--p-mob-border, 0) * 2000); opacity: calc(1 - var(--p-mob-bg, 0) - var(--p-out, 0)); will-change: stroke-dashoffset, opacity; }
        #mob-bg { opacity: calc(var(--p-mob-bg, 0) - var(--p-out, 0)); will-change: opacity; }
        #mob-header { opacity: calc(var(--p-mob-header, 0) - var(--p-out, 0)); transform: translateY(calc((1 - var(--p-mob-header, 0)) * -60px + var(--p-out, 0) * -60px)); will-change: transform, opacity; }
        
        /* 移动端对话气泡：分离为独立变量，实现逐条动画效果 */
        #mob-msg1 { opacity: calc(var(--p-mob-msg1, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-mob-msg1, 0)) * 60px + var(--p-out, 0) * 60px)); will-change: transform, opacity; }
        #mob-msg2 { opacity: calc(var(--p-mob-msg2, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-mob-msg2, 0)) * -60px + var(--p-out, 0) * -60px)); will-change: transform, opacity; }
        #mob-msg3 { opacity: calc(var(--p-mob-msg3, 0) - var(--p-out, 0)); transform: translateX(calc((1 - var(--p-mob-msg3, 0)) * -60px + var(--p-out, 0) * -60px)); will-change: transform, opacity; }
        #mob-input { opacity: calc(var(--p-mob-input, 0) - var(--p-out, 0)); transform: translateY(calc((1 - var(--p-mob-input, 0)) * 80px + var(--p-out, 0) * 80px)); will-change: transform, opacity; }
        #mob-home-indicator { opacity: calc(var(--p-mob-input, 0) - var(--p-out, 0)); transform: translateY(calc(var(--p-out, 0) * 60px)); will-change: transform, opacity; }

        /* ====== 空间漂移控制 (保证绝对的齐平与居中分离) ====== */
        #desktop-wrapper {
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%) perspective(1400px) translateX(calc(var(--p-pc-focus, 0) * 260px - var(--p-shift, 0) * 470px)) rotateX(calc((var(--p-pc-angle, 0) + var(--p-pair-angle, 0)) * 1deg)) rotateY(calc(var(--p-pc-angle, 0) * -10deg + var(--p-pair-angle, 0) * 11deg)) scale(calc(1 - var(--p-shift, 0) * 0.15));
            filter: drop-shadow(calc(var(--p-device-shadow, 0) * 0px) calc(var(--p-device-shadow, 0) * 24px) calc(var(--p-device-shadow, 0) * 28px) rgba(15, 23, 42, 0.18));
            transform-style: preserve-3d;
            z-index: 30;
            will-change: transform;
        }
        #mobile-wrapper {
            /* 拥有与 desktop 完全一致的 scale 计算逻辑，确保视觉高度绝对齐平 */
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%) perspective(1400px) translateX(calc(var(--p-shift, 0) * 390px)) translateY(calc((1 - var(--p-mobile-depth, 0)) * 12px)) translateZ(calc((1 - var(--p-mobile-depth, 0)) * -180px)) rotateX(calc(var(--p-pair-angle, 0) * 1deg)) rotateY(calc(var(--p-pair-angle, 0) * -12deg)) scale(calc(0.92 + var(--p-mobile-depth, 0) * 0.08 - var(--p-shift, 0) * 0.15));
            filter: drop-shadow(calc(var(--p-device-shadow, 0) * 0px) calc(var(--p-device-shadow, 0) * 24px) calc(var(--p-device-shadow, 0) * 28px) rgba(15, 23, 42, 0.16));
            transform-style: preserve-3d;
            z-index: 20;
            opacity: calc(var(--p-shift, 0) * 1.5);
            will-change: transform, opacity;
        }

        #pc-copy-panel {
            opacity: calc(var(--p-pc-copy, 0) - var(--p-pc-copy-out, 0));
            transform: translateY(calc(-50% + (1 - var(--p-pc-copy, 0)) * 28px));
            will-change: transform, opacity;
        }
        #pc-copy-content {
            opacity: var(--p-copy-text, 0);
            transform: translateY(calc((1 - var(--p-copy-text, 0)) * 16px));
            will-change: transform, opacity;
        }
        #mobile-copy-panel {
            display: none;
        }

        /* ====== 背景遮罩与动画 ====== */
        .mask-fade-y {
            mask-image: linear-gradient(to bottom, transparent, black 5%, black 95%, transparent);
            -webkit-mask-image: linear-gradient(to bottom, transparent, black 5%, black 95%, transparent);
        }

        .card-3d { transition: transform 0.1s ease-out, box-shadow 0.1s ease-out; transform-style: preserve-3d; }
        .fade-up-element { opacity: 0; transform: translateY(40px) translateZ(-50px) rotateX(-10deg); transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1); }
        .fade-right-element { opacity: 0; transform: translateX(-40px); transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1); }
        .fade-left-element { opacity: 0; transform: translateX(40px); transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1); }
        .is-visible { opacity: 1; transform: translateY(0) translateZ(0) rotateX(0) translateX(0); }

        .glass-nav { background: rgba(255, 255, 255, 0.88); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); border-bottom: 1px solid rgba(226, 232, 240, 0.82); }
        #mobile-menu-panel {
            opacity: 0;
            pointer-events: none;
            transform: translateY(-6px) scale(0.98);
            transition: opacity 0.24s cubic-bezier(0.16, 1, 0.3, 1), transform 0.24s cubic-bezier(0.16, 1, 0.3, 1);
        }
        #mobile-menu-panel.is-open {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0) scale(1);
        }
        #mobile-menu-toggle .menu-line {
            transform-origin: center;
            transition: transform 0.22s ease, opacity 0.18s ease;
        }
        #mobile-menu-toggle.is-open .menu-line:nth-child(1) { transform: translateY(5px) rotate(45deg); }
        #mobile-menu-toggle.is-open .menu-line:nth-child(2) { opacity: 0; }
        #mobile-menu-toggle.is-open .menu-line:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
        .prompt-shell {
            box-shadow: 0 18px 45px rgba(15, 23, 42, 0.10), 0 2px 8px rgba(15, 23, 42, 0.06);
        }
        .typing-caret {
            display: inline-block;
            width: 2px;
            height: 1.2em;
            margin-left: 2px;
            background: #2563eb;
            vertical-align: -0.18em;
            animation: caret-blink 0.9s steps(2, start) infinite;
        }
        @keyframes caret-blink {
            0%, 45% { opacity: 1; }
            46%, 100% { opacity: 0; }
        }
        #scroll-track {
            --stage-scale: 1;
            --p-prompt-in: 0;
            --p-prompt-type-a: 0;
            --p-prompt-type-b: 0;
            --p-prompt-graph: 0;
        }
        #svg-container {
            width: 1200px !important;
            max-width: none !important;
            transform: scale(var(--stage-scale));
            transform-origin: center center;
            will-change: transform;
        }
        .prompt-float {
            opacity: calc(var(--p-prompt-in, 0) * 0.34);
            transform: translateY(calc((1 - var(--p-prompt-in, 0)) * 32px));
            will-change: transform, opacity;
        }
        .prompt-type-a {
            clip-path: inset(0 calc(100% - var(--p-prompt-type-a, 0) * 100%) 0 0);
        }
        .prompt-type-b {
            clip-path: inset(0 calc(100% - var(--p-prompt-type-b, 0) * 100%) 0 0);
        }
        #demo-cursor {
            opacity: var(--p-cursor, 0);
            transform: translate(calc(-50% + var(--cursor-x, 0px)), calc(-50% + var(--cursor-y, 0px))) scale(calc(1 - var(--p-click, 0) * 0.12));
            filter: drop-shadow(0 12px 18px rgba(15, 23, 42, 0.22));
            will-change: transform, opacity;
        }
        #prompt-send-button {
            transform: scale(calc(1 - var(--p-send-press, 0) * 0.07));
            box-shadow: 0 18px 28px rgba(37, 99, 235, calc(0.25 + var(--p-send-press, 0) * 0.22));
            will-change: transform, box-shadow;
        }
        #send-ripple {
            opacity: calc(var(--p-send-ripple, 0) * 0.72);
            transform: translate(-50%, -50%) scale(calc(0.25 + var(--p-send-ripple, 0) * 3.2));
            will-change: transform, opacity;
        }
        #software-demo {
            opacity: var(--p-software, 0);
            transform: translate(-50%, -50%) translateY(calc((1 - var(--p-software, 0)) * 34px)) scale(calc(0.96 + var(--p-software, 0) * 0.04));
            will-change: transform, opacity;
        }
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: #f8fafc; }
        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
        @media (max-width: 768px) {
            .glass-nav .max-w-7xl { height: 64px; padding-left: 16px; padding-right: 16px; }
            .glass-nav img { width: 34px; height: 34px; }
            .glass-nav span.text-xl { font-size: 1rem; }
            .glass-nav button { padding: 0.55rem 0.9rem; }
            #nav-actions { gap: 0.5rem; }
            #mobile-menu-toggle { padding: 0; }
            #nav-login-button { padding: 0.55rem 0.85rem; }
            #scroll-track .sticky { padding-left: 12px; padding-right: 12px; padding-top: 76px; }
            #scroll-hint {
                margin-bottom: 0.75rem;
                transform: translateY(88px);
            }
            #hint-title { font-size: 1.45rem; line-height: 1.15; }
            #svg-container {
                width: 1200px !important;
                max-width: none !important;
            }
            #pc-copy-panel { display: none; }
            #mobile-copy-panel {
                display: block;
                opacity: var(--p-copy-text, 0);
                transform: translateX(-50%) translateY(calc((1 - var(--p-copy-text, 0)) * 18px));
                will-change: transform, opacity;
            }
            #desktop-wrapper { width: 900px !important; }
            #mobile-wrapper { width: 340px !important; }
            #desktop-wrapper {
                transform: translate(-50%, -50%) perspective(1200px) translateX(calc(var(--p-shift, 0) * -130px)) rotateY(calc(var(--p-shift, 0) * 8deg)) scale(calc(1 - var(--p-shift, 0) * 0.12));
            }
            #mobile-wrapper {
                transform: translate(-50%, -50%) perspective(1200px) translateX(calc(var(--p-shift, 0) * 390px)) translateY(calc(var(--p-shift, 0) * -10px)) rotateY(calc(var(--p-shift, 0) * -16deg)) scale(calc(0.88 + var(--p-mobile-depth, 0) * 0.08 - var(--p-shift, 0) * 0.10));
            }
            #prompt-demo {
                width: 1120px !important;
                max-width: none !important;
            }
            #software-demo {
                width: 1120px !important;
                max-width: none !important;
                overflow: hidden;
            }
        }
        @media (max-width: 640px) {
            .glass-nav .max-w-7xl { padding-left: 12px; padding-right: 12px; }
            .glass-nav .max-w-7xl > div:first-child { gap: 0.5rem; min-width: 0; }
            .glass-nav span.text-xl { font-size: 0.92rem; white-space: nowrap; }
            #nav-login-button { padding: 0.5rem 0.7rem; }
            #mobile-menu-toggle { width: 2.5rem; height: 2.5rem; flex: 0 0 2.5rem; }
            #prompt-agent-label { white-space: nowrap; }
        }
        @media (max-width: 390px) {
            .glass-nav .max-w-7xl { padding-left: 10px; padding-right: 10px; }
            .glass-nav img { width: 30px; height: 30px; }
            .glass-nav span.text-xl { font-size: 0.84rem; }
            #nav-actions { gap: 0.35rem; }
            #nav-login-button { padding: 0.45rem 0.58rem; }
            #mobile-menu-toggle { width: 2.35rem; height: 2.35rem; flex-basis: 2.35rem; }
        }
        @media (max-width: 350px) {
            #nav-login-button svg { display: none; }
        }