:root {
            --bg-deep: #0a0a0f;
            --bg-elevated: #12121a;
            --bg-card: #181822;
            --bg-card-hover: #1f1f2e;
            --border: rgba(255, 255, 255, 0.07);
            --border-hover: rgba(255, 255, 255, 0.14);
            --text-primary: #f2f2f7;
            --text-secondary: #9d9db0;
            --text-muted: #64647a;
            --accent: #7c5cff;
            --accent-2: #ff4d8d;
            --accent-glow: rgba(124, 92, 255, 0.28);
            --gradient: linear-gradient(135deg, #7c5cff 0%, #ff4d8d 100%);
            --radius: 16px;
            --radius-sm: 10px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        html { scroll-behavior: smooth; }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

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

        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ---------- 导航 ---------- */
        .nav {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(10, 10, 15, 0.78);
            backdrop-filter: blur(18px) saturate(180%);
            border-bottom: 1px solid var(--border);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        .logo-img {
            width: 30px;
            height: 30px;
            border-radius: 8px;
            display: block;
            box-shadow: 0 0 20px var(--accent-glow);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .nav-links a {
            transition: color 0.2s;
        }

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

        .nav-cta {
            padding: 8px 20px;
            border-radius: 999px;
            background: var(--gradient);
            color: #fff !important;
            font-weight: 600;
            font-size: 13px;
            box-shadow: 0 4px 20px var(--accent-glow);
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .nav-cta:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 26px var(--accent-glow);
        }

        /* ---------- Hero ---------- */
        .hero {
            position: relative;
            padding: 60px 0 80px;
            overflow: hidden;
            text-align: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -260px;
            left: 50%;
            transform: translateX(-50%);
            width: 900px;
            height: 700px;
            background: radial-gradient(ellipse at center, rgba(124, 92, 255, 0.22) 0%, rgba(255, 77, 141, 0.08) 40%, transparent 70%);
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
            background-size: 56px 56px;
            mask-image: radial-gradient(ellipse at 50% 30%, black 20%, transparent 70%);
            pointer-events: none;
        }

        .hero-content { position: relative; z-index: 1; }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            border-radius: 999px;
            border: 1px solid var(--border-hover);
            background: rgba(255, 255, 255, 0.03);
            font-size: 12.5px;
            color: var(--text-secondary);
            margin-bottom: 26px;
        }

        .hero-badge .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: #3ddc97;
            box-shadow: 0 0 8px rgba(61, 220, 151, 0.7);
        }

        .hero h1 {
            font-size: clamp(34px, 5.6vw, 64px);
            font-weight: 800;
            line-height: 1.12;
            letter-spacing: -0.035em;
            margin-bottom: 22px;
        }

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

        .hero-sub {
            max-width: 680px;
            margin: 0 auto 18px;
            font-size: clamp(15px, 1.7vw, 18px);
            color: var(--text-secondary);
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px 22px;
            margin-bottom: 36px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .hero-meta span { display: inline-flex; align-items: center; gap: 6px; }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 56px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 999px;
            font-size: 14.5px;
            font-weight: 600;
            transition: all 0.22s;
        }

        .btn-primary {
            background: var(--gradient);
            color: #fff;
            box-shadow: 0 6px 28px var(--accent-glow);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 36px rgba(124, 92, 255, 0.4);
        }

        .btn-ghost {
            border: 1px solid var(--border-hover);
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.02);
        }

        .btn-ghost:hover {
            border-color: var(--text-muted);
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        /* ---------- 视频预览框 ---------- */
        .hero-preview {
            position: relative;
            z-index: 1;
            max-width: 880px;
            margin: 0 auto;
            border-radius: 20px;
            border: 1px solid var(--border-hover);
            background: var(--bg-elevated);
            overflow: hidden;
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(124, 92, 255, 0.08);
        }

        .preview-bar {
            display: flex;
            align-items: center;
            gap: 7px;
            padding: 12px 16px;
            border-bottom: 1px solid var(--border);
            background: rgba(255, 255, 255, 0.015);
        }

        .preview-bar .dot { width: 9px; height: 9px; border-radius: 50%; }
        .preview-bar .dot:nth-child(1) { background: #ff5f57; }
        .preview-bar .dot:nth-child(2) { background: #febc2e; }
        .preview-bar .dot:nth-child(3) { background: #28c840; }

        .preview-bar .url {
            margin-left: 12px;
            font-size: 11.5px;
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.03);
            padding: 4px 12px;
            border-radius: 6px;
        }

        .preview-body {
            padding: 32px 28px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            min-height: 260px;
            background:
                radial-gradient(ellipse at 30% 40%, rgba(124, 92, 255, 0.12), transparent 60%),
                radial-gradient(ellipse at 75% 65%, rgba(255, 77, 141, 0.07), transparent 55%);
        }

        .canvas-node {
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: rgba(255, 255, 255, 0.025);
            padding: 16px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            transition: border-color 0.3s;
        }

        .canvas-node:hover { border-color: rgba(124, 92, 255, 0.35); }

        .node-tag {
            font-size: 10.5px;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--accent);
            font-weight: 700;
        }

        .node-line {
            height: 7px;
            border-radius: 4px;
            background: rgba(255, 255, 255, 0.06);
        }

        .node-line.w80 { width: 80%; }
        .node-line.w60 { width: 60%; }
        .node-line.w45 { width: 45%; }

        .node-chip-row { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }

        .node-chip {
            font-size: 10px;
            padding: 3px 9px;
            border-radius: 999px;
            border: 1px solid var(--border);
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.02);
        }

        .node-chip.active {
            border-color: rgba(124, 92, 255, 0.4);
            color: #b8a6ff;
            background: rgba(124, 92, 255, 0.08);
        }

        .node-thumb {
            flex: 1;
            min-height: 70px;
            border-radius: 8px;
            background: linear-gradient(135deg, rgba(124, 92, 255, 0.18), rgba(255, 77, 141, 0.10));
            border: 1px dashed rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 11px;
            letter-spacing: 0.04em;
        }

        .canvas-node.full { grid-column: 1 / -1; flex-direction: row; align-items: center; gap: 16px; }
        .canvas-node.full .node-thumb { min-height: 54px; }

        /* ---------- 通用 Section ---------- */
        section { padding: 88px 0; }

        .section-head {
            max-width: 720px;
            margin-bottom: 48px;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 14px;
        }

        .section-label::before {
            content: '';
            width: 18px;
            height: 2px;
            background: var(--gradient);
            border-radius: 2px;
        }

        .section-head h2 {
            font-size: clamp(26px, 3.5vw, 40px);
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.18;
            margin-bottom: 14px;
        }

        .section-head p {
            font-size: 15.5px;
            color: var(--text-secondary);
            max-width: 620px;
        }

        /* ---------- 介绍 / Intro ---------- */
        .intro-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 32px;
            align-items: start;
        }

        .intro-text p {
            color: var(--text-secondary);
            font-size: 15.5px;
            margin-bottom: 18px;
        }

        .intro-text strong { color: var(--text-primary); font-weight: 600; }

        .intro-quote {
            margin-top: 24px;
            padding: 22px 24px;
            border-radius: var(--radius-sm);
            border-left: 3px solid var(--accent);
            background: rgba(124, 92, 255, 0.05);
            font-size: 14.5px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .intro-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
        }

        .stat-card {
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--bg-card);
            padding: 20px;
        }

        .stat-card .num {
            font-size: 26px;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 4px;
        }

        .stat-card .label {
            font-size: 12.5px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ---------- 核心功能 ---------- */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .feature-card {
            border-radius: var(--radius);
            border: 1px solid var(--border);
            background: var(--bg-card);
            padding: 28px 24px;
            transition: all 0.28s;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--gradient);
            opacity: 0;
            transition: opacity 0.28s;
        }

        .feature-card:hover {
            border-color: var(--border-hover);
            background: var(--bg-card-hover);
            transform: translateY(-3px);
        }

        .feature-card:hover::before { opacity: 1; }

        .feature-icon {
            width: 42px;
            height: 42px;
            border-radius: 10px;
            background: rgba(124, 92, 255, 0.1);
            border: 1px solid rgba(124, 92, 255, 0.18);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            margin-bottom: 18px;
        }

        .feature-card h3 {
            font-size: 16.5px;
            font-weight: 700;
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }

        .feature-card p {
            font-size: 13.8px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .feature-card .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 5px;
            margin-top: 14px;
        }

        .model-tag {
            font-size: 10.5px;
            padding: 3px 9px;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            color: var(--text-muted);
        }

        /* ---------- 选择理由 ---------- */
        .reasons-wrap {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .reason-item {
            display: flex;
            gap: 18px;
            padding: 24px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            background: var(--bg-card);
        }

        .reason-num {
            flex-shrink: 0;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: var(--gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 800;
            color: #fff;
        }

        .reason-item h3 {
            font-size: 15.5px;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .reason-item p {
            font-size: 13.5px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ---------- 应用场景 ---------- */
        .scenes-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .scene-card {
            border-radius: var(--radius);
            border: 1px solid var(--border);
            background: var(--bg-card);
            padding: 26px 22px;
            transition: border-color 0.25s, background 0.25s;
        }

        .scene-card:hover {
            border-color: rgba(124, 92, 255, 0.3);
            background: var(--bg-card-hover);
        }

        .scene-card .scene-icon {
            font-size: 22px;
            margin-bottom: 14px;
            display: block;
        }

        .scene-card h3 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .scene-card p {
            font-size: 13.2px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ---------- 使用方法 ---------- */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
            counter-reset: step;
        }

        .step {
            position: relative;
            padding: 26px 20px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            background: var(--bg-card);
            counter-increment: step;
        }

        .step::before {
            content: counter(step, decimal-leading-zero);
            font-size: 13px;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: 0.04em;
            display: block;
            margin-bottom: 14px;
            font-variant-numeric: tabular-nums;
        }

        .step h3 {
            font-size: 14.5px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .step p {
            font-size: 12.8px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .steps-note {
            margin-top: 20px;
            padding: 16px 20px;
            border-radius: var(--radius-sm);
            border: 1px dashed var(--border-hover);
            font-size: 13px;
            color: var(--text-muted);
            text-align: center;
        }

        .steps-note a { color: var(--accent); border-bottom: 1px solid rgba(124, 92, 255, 0.3); }

        /* ---------- 定价简表 ---------- */
        .pricing-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 12px;
            margin-top: 8px;
        }

        .price-chip {
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--bg-card);
            padding: 18px 16px;
            text-align: center;
        }

        .price-chip .plan { font-size: 12.5px; color: var(--text-muted); margin-bottom: 6px; }
        .price-chip .amount { font-size: 20px; font-weight: 800; letter-spacing: -0.02em; }
        .price-chip .amount span { font-size: 12px; font-weight: 400; color: var(--text-muted); }
        .price-chip .credit { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

        .price-chip.hot {
            border-color: rgba(124, 92, 255, 0.4);
            background: linear-gradient(180deg, rgba(124, 92, 255, 0.08), var(--bg-card));
        }

        .price-chip.hot .amount { background: var(--gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

        /* ---------- FAQ ---------- */
        .faq-list { display: flex; flex-direction: column; gap: 10px; max-width: 860px; }

        .faq-item {
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--bg-card);
            overflow: hidden;
            transition: border-color 0.25s;
        }

        .faq-item[open] { border-color: rgba(124, 92, 255, 0.3); }

        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 18px 22px;
            font-size: 14.5px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            user-select: none;
        }

        .faq-item summary::-webkit-details-marker { display: none; }

        .faq-item summary::after {
            content: '+';
            font-size: 18px;
            font-weight: 300;
            color: var(--text-muted);
            transition: transform 0.25s;
            flex-shrink: 0;
        }

        .faq-item[open] summary::after {
            transform: rotate(45deg);
            color: var(--accent);
        }

        .faq-item p {
            padding: 0 22px 20px;
            font-size: 13.8px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* ---------- 资讯 ---------- */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .news-card {
            border-radius: var(--radius);
            border: 1px solid var(--border);
            background: var(--bg-card);
            padding: 24px 22px;
            transition: all 0.25s;
            display: flex;
            flex-direction: column;
        }

        .news-card:hover {
            border-color: var(--border-hover);
            background: var(--bg-card-hover);
            transform: translateY(-2px);
        }

        .news-date {
            font-size: 11.5px;
            color: var(--text-muted);
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }

        .news-card h3 {
            font-size: 14.8px;
            font-weight: 700;
            line-height: 1.45;
            margin-bottom: 10px;
        }

        .news-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.65;
            flex: 1;
        }

        .news-source {
            margin-top: 14px;
            font-size: 11.5px;
            color: var(--text-muted);
        }

        /* ---------- CTA / Footer ---------- */
        .final-cta {
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .final-cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(124, 92, 255, 0.15), transparent 65%);
            pointer-events: none;
        }

        .final-cta .inner { position: relative; z-index: 1; }

        .final-cta h2 {
            font-size: clamp(24px, 3.2vw, 36px);
            font-weight: 800;
            letter-spacing: -0.03em;
            margin-bottom: 12px;
        }

        .final-cta p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 28px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        footer {
            border-top: 1px solid var(--border);
            padding: 36px 0;
            font-size: 12.5px;
            color: var(--text-muted);
        }

        .footer-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
        .footer-links a { transition: color 0.2s; }
        .footer-links a:hover { color: var(--text-secondary); }

        /* ---------- 响应式 ---------- */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .scenes-grid { grid-template-columns: repeat(2, 1fr); }
            .steps { grid-template-columns: repeat(2, 1fr); }
            .news-grid { grid-template-columns: repeat(2, 1fr); }
            .pricing-row { grid-template-columns: repeat(2, 1fr); }
            .intro-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 720px) {
            .nav-links { display: none; }
            .hero { padding: 72px 0 56px; }
            .preview-body { grid-template-columns: 1fr; }
            .features-grid,
            .scenes-grid,
            .reasons-wrap,
            .news-grid,
            .pricing-row { grid-template-columns: 1fr; }
            .steps { grid-template-columns: 1fr; }
            section { padding: 64px 0; }
            .footer-inner { flex-direction: column; text-align: center; }
            .hero-actions { flex-direction: column; align-items: center; }
            .btn { width: 100%; justify-content: center; max-width: 320px; }
        }