/* ================= 1. AI+编程 专属展示页 ================= */
        #ai-portfolio-page {
            position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: 9999;
            opacity: 0; pointer-events: none; transition: opacity 0.4s ease;
            background-color: #050505;
            background-image: linear-gradient(rgba(37, 99, 235, 0.1) 1px, transparent 1px), linear-gradient(90deg, rgba(37, 99, 235, 0.1) 1px, transparent 1px);
            background-size: 40px 40px; background-position: center center; display: block; overflow-y: auto; overflow-x: hidden; -webkit-overflow-scrolling: touch;
        }
        #ai-portfolio-page.active { opacity: 1; pointer-events: auto; }

        #matrix-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100vh; z-index: 1; opacity: 0.25; pointer-events: none; }

        .glow-orb {
            position: absolute; top: 50vh; left: 50%; transform: translate(-50%, -50%);
            width: 50vw; height: 50vw; max-width: 500px; max-height: 500px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.25) 0%, transparent 65%); border-radius: 50%; z-index: 2; pointer-events: none;
            animation: pulseOrb 4s infinite alternate ease-in-out;
        }
        @keyframes pulseOrb { 0% { transform: translate(-50%, -50%) scale(0.85); opacity: 0.6; } 100% { transform: translate(-50%, -50%) scale(1.15); opacity: 1; } }

        .btn-close-overlay {
            position: fixed; top: 2rem; left: 2rem; background: rgba(10, 10, 10, 0.8); color: #60a5fa; border: 1px solid #3b82f6;
            padding: 10px 20px; font-family: monospace; font-size: 0.95rem; cursor: pointer; transition: all 0.3s; text-transform: uppercase; z-index: 10; backdrop-filter: blur(5px);
        }
        .btn-close-overlay:hover { background: rgba(59, 130, 246, 0.3); box-shadow: 0 0 20px rgba(59, 130, 246, 0.8); color: #ffffff; letter-spacing: 1px; }

        .title-wrapper-ai { display: flex; flex-direction: column; align-items: center; z-index: 3; position: relative;}

        .glitch-text {
            font-size: 3rem; font-weight: 900; color: #ffffff; letter-spacing: 4px; position: relative; text-align: center;
            -webkit-mask-image: linear-gradient(to right, #000 50%, transparent 50%); -webkit-mask-size: 200% 100%; -webkit-mask-position: 100% 0; opacity: 0;
        }
        @media (min-width: 768px) { .glitch-text { font-size: 5.5rem; letter-spacing: 8px; } }

        #ai-portfolio-page.active .glitch-text { animation: wipeReveal 0.8s cubic-bezier(0.2, 1, 0.3, 1) forwards, textJitter 0.2s 0.8s infinite linear alternate-reverse; }

        @keyframes wipeReveal { 0% { -webkit-mask-position: 100% 0; filter: blur(10px); transform: translateX(-30px); opacity: 0; } 100% { -webkit-mask-position: 0 0; filter: blur(0px); transform: translateX(0); opacity: 1; } }

        @keyframes textJitter {
            0% { transform: translate(2px, 1px) skewX(2deg); filter: hue-rotate(0deg) drop-shadow(0 0 2px rgba(255,255,255,0.5)); }
            20% { transform: translate(-2px, 0px) skewX(0deg); filter: hue-rotate(45deg); }
            40% { transform: translate(2px, -1px) skewX(-1deg); filter: hue-rotate(90deg); }
            60% { transform: translate(-2px, -2px) skewX(-2deg); filter: hue-rotate(135deg); }
            80% { transform: translate(2px, 2px) skewX(1deg); filter: hue-rotate(180deg) drop-shadow(0 0 4px rgba(0,255,255,0.8)); }
            100% { transform: translate(0px, 0px) skewX(0deg); filter: hue-rotate(225deg); }
        }

        .glitch-text::before, .glitch-text::after { content: attr(data-text); position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; }
        .glitch-text::before { color: #0ff; z-index: -1; }
        .glitch-text::after { color: #f0f; z-index: -2; }

        #ai-portfolio-page.active .glitch-text::before { animation: glitch-anim-1 2s 0.8s infinite linear alternate-reverse forwards; }
        #ai-portfolio-page.active .glitch-text::after { animation: glitch-anim-2 3s 0.8s infinite linear alternate-reverse forwards; }

        @keyframes glitch-anim-1 {
            0% { clip-path: inset(20% 0 80% 0); transform: translate(-4px, 2px); filter: blur(2px); opacity: 0.9; text-shadow: 3px 0 5px rgba(0,255,255,0.8); }
            20% { clip-path: inset(60% 0 10% 0); transform: translate(4px, -2px); filter: blur(0px); opacity: 1; }
            40% { clip-path: inset(40% 0 50% 0); transform: translate(-4px, 4px); filter: blur(3px); opacity: 0.8; }
            60% { clip-path: inset(80% 0 5% 0); transform: translate(4px, -4px); filter: blur(0px); opacity: 1; text-shadow: none; }
            80% { clip-path: inset(10% 0 70% 0); transform: translate(-2px, 2px); filter: blur(1.5px); opacity: 0.9; }
            100% { clip-path: inset(30% 0 40% 0); transform: translate(2px, -2px); filter: blur(0px); opacity: 1; }
        }
        @keyframes glitch-anim-2 {
            0% { clip-path: inset(10% 0 60% 0); transform: translate(4px, -2px); filter: blur(0px); opacity: 1; }
            20% { clip-path: inset(30% 0 20% 0); transform: translate(-4px, 4px); filter: blur(2px); opacity: 0.8; text-shadow: -3px 0 5px rgba(255,0,255,0.8); }
            40% { clip-path: inset(70% 0 10% 0); transform: translate(4px, 2px); filter: blur(0px); opacity: 1; }
            60% { clip-path: inset(20% 0 50% 0); transform: translate(-2px, -4px); filter: blur(3px); opacity: 0.7; }
            80% { clip-path: inset(50% 0 30% 0); transform: translate(2px, 4px); filter: blur(0px); opacity: 1; }
            100% { clip-path: inset(5% 0 80% 0); transform: translate(-4px, 2px); filter: blur(2px); opacity: 0.9; }
        }

        .ai-subtitle-en {
            display: inline-block; background-color: #111111; color: #39ff14; font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 1.1rem; padding: 6px 16px; border-radius: 6px; letter-spacing: 3px; margin-top: 1.5rem; text-transform: uppercase;
            opacity: 0; border: 1px solid rgba(57, 255, 20, 0.3); box-shadow: 0 5px 15px rgba(0,0,0,0.5); position: relative; z-index: 3;
        }
        @media (min-width: 768px) { .ai-subtitle-en { font-size: 1.3rem; letter-spacing: 5px; } }

        #ai-portfolio-page.active .ai-subtitle-en { animation: subReveal 0.6s 0.6s cubic-bezier(0.2, 1, 0.3, 1) forwards; }
        @keyframes subReveal { 0% { opacity: 0; filter: blur(5px); transform: translateY(15px); } 100% { opacity: 0.8; filter: blur(0); transform: translateY(0); } }

        .ai-hero-section { height: 100vh; width: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; z-index: 3; }
        .ai-content-section { max-width: 900px; margin: 0 auto; padding: 2rem 1rem 10rem 1rem; position: relative; z-index: 3; }

        .ai-project-card {
            background-color: #161616; border-radius: 20px; padding: 1.5rem; box-shadow: 0 20px 50px rgba(0,0,0,0.5);
            border: 1px solid rgba(255,255,255,0.05); transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.4s ease; margin-bottom: 35vh;
        }
        .ai-project-card:last-child { margin-bottom: 10vh; }
        .ai-project-card:hover { transform: translateY(-8px); border-color: rgba(255,255,255,0.1); }

        .ai-fade-in { opacity: 0; transform: translateY(80px); transition: opacity 1.2s cubic-bezier(0.2, 1, 0.3, 1), transform 1.2s cubic-bezier(0.2, 1, 0.3, 1); will-change: opacity, transform; }
        .ai-fade-in.visible { opacity: 1; transform: translateY(0); }

        .ai-project-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; border-radius: 12px; background-color: #222; display: block; margin-bottom: 1.5rem; }
        .ai-project-meta { color: #a3a3a3; font-size: 0.9rem; font-weight: 500; letter-spacing: 2px; margin-bottom: 0.8rem; }
        .ai-project-title-en { font-family: 'Impact', 'Arial Black', sans-serif; color: #ffffff; font-size: 2.2rem; text-transform: uppercase; letter-spacing: 1px; line-height: 1.1; margin: 0; text-shadow: 2px 2px 10px rgba(255,255,255,0.1); }

        .ai-video-trigger {
            position: relative; display: block; width: 100%; padding: 0; margin: 0 0 1.5rem;
            border: 0; border-radius: 12px; overflow: hidden; background: #222; color: #fff;
            cursor: pointer; font: inherit; text-align: left;
        }
        .ai-video-trigger .ai-project-img { margin-bottom: 0; transition: transform 0.5s ease, filter 0.5s ease; }
        .ai-video-trigger::after {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(180deg, transparent 35%, rgba(0, 0, 0, 0.68));
            pointer-events: none;
        }
        .ai-video-trigger:hover .ai-project-img,
        .ai-video-trigger:focus-visible .ai-project-img { transform: scale(1.025); filter: brightness(0.82); }
        .ai-video-trigger:focus-visible { outline: 3px solid #39ff14; outline-offset: 4px; }
        .ai-video-play {
            position: absolute; z-index: 2; left: 50%; top: 50%; transform: translate(-50%, -50%);
            display: inline-flex; align-items: center; gap: 0.7rem; padding: 0.7rem 1rem;
            border: 1px solid rgba(255, 255, 255, 0.6); border-radius: 999px;
            background: rgba(5, 5, 5, 0.72); color: #fff; font-weight: 800; letter-spacing: 1px;
            backdrop-filter: blur(8px); transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
        }
        .ai-video-trigger:hover .ai-video-play,
        .ai-video-trigger:focus-visible .ai-video-play {
            background: rgba(0, 180, 216, 0.92); box-shadow: 0 0 26px rgba(0, 180, 216, 0.65);
            transform: translate(-50%, -50%) scale(1.04);
        }
        .ai-video-play-icon { display: grid; place-items: center; width: 1.8rem; height: 1.8rem; font-size: 0.9rem; }
        .ai-project-summary { margin: 0.9rem 0 1.2rem; color: #d4d4d4; line-height: 1.8; }
        .ai-douyin-link, .ai-video-modal-link {
            display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.7rem 1rem;
            border: 1px solid rgba(96, 165, 250, 0.65); border-radius: 999px;
            color: #93c5fd; font-weight: 800; letter-spacing: 1px;
        }
        .ai-douyin-link:hover, .ai-video-modal-link:hover,
        .ai-douyin-link:focus-visible, .ai-video-modal-link:focus-visible {
            border-color: #39ff14; color: #39ff14; box-shadow: 0 0 18px rgba(57, 255, 20, 0.2);
        }

        .ai-video-modal[hidden] { display: none; }
        .ai-video-modal {
            position: fixed; inset: 0; z-index: 12000; display: grid; place-items: center;
            padding: 4.5rem 1.5rem 1.5rem; opacity: 0; transition: opacity 0.25s ease;
        }
        .ai-video-modal.is-open { opacity: 1; }
        .ai-video-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.88); backdrop-filter: blur(12px); }
        .ai-video-dialog {
            position: relative; z-index: 1; width: min(900px, 100%); max-height: calc(100vh - 6rem);
            overflow-y: auto; padding: 1.25rem; border: 1px solid rgba(96, 165, 250, 0.45);
            border-radius: 20px; background: #0d0d0d; box-shadow: 0 30px 100px rgba(0, 0, 0, 0.75);
            transform: translateY(16px) scale(0.98); transition: transform 0.25s ease;
        }
        .ai-video-modal.is-open .ai-video-dialog { transform: translateY(0) scale(1); }
        .ai-video-close {
            position: sticky; top: 0; float: right; z-index: 3; width: 42px; height: 42px;
            border: 1px solid rgba(255, 255, 255, 0.32); border-radius: 50%;
            background: rgba(5, 5, 5, 0.9); color: #fff; font-size: 1.8rem; line-height: 1;
            cursor: pointer;
        }
        .ai-video-close:hover, .ai-video-close:focus-visible { border-color: #39ff14; color: #39ff14; outline: none; }
        .ai-video-modal-title { margin: 0 3.5rem 1rem 0; color: #fff; font-size: clamp(1.25rem, 3vw, 2rem); }
        .ai-video-frame-slot { width: 100%; aspect-ratio: 16/9; border-radius: 12px; overflow: hidden; background: #000; }
        .ai-video-frame-slot iframe { display: block; width: 100%; height: 100%; border: 0; }
        .ai-video-status { margin: 1rem 0; color: #a3a3a3; line-height: 1.6; }

        @media (max-width: 600px) {
            .ai-video-modal { padding: 4rem 0.75rem 0.75rem; }
            .ai-video-dialog { max-height: calc(100vh - 4.75rem); padding: 0.85rem; border-radius: 14px; }
            .ai-video-play { padding: 0.55rem 0.8rem; font-size: 0.85rem; }
            .ai-video-close { width: 40px; height: 40px; }
        }

        @media (prefers-reduced-motion: reduce) {
            .ai-video-modal, .ai-video-dialog, .ai-video-trigger .ai-project-img, .ai-video-play { transition: none; }
        }

        @media (min-width: 768px) { .ai-project-card { padding: 2rem; margin-bottom: 25vh; } .ai-project-title-en { font-size: 3.5rem; } }