*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --blue: #4f6ef7;
            --blue-deep: #3b56e0;
            --warm: #f59e4b;
            --ink: #1a1a2e;
            --stone: #6b7280;
            --snow: #fafafa;
            --card-bg: #ffffff;
            --border-light: rgba(0, 0, 0, 0.05);
            --shadow-card: 0 20px 40px -12px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 28px 50px -14px rgba(0, 0, 0, 0.10);
            --radius-lg: 22px;
            --radius-xl: 28px;
            --radius-sm: 14px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
            color: var(--ink);
            background-color: var(--snow);
            overflow-x: hidden;
            letter-spacing: -0.01em;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            line-height: 1.5;
        }
        .ambient-glow {
            position: fixed;
            top: -280px;
            left: 50%;
            transform: translateX(-50%);
            width: 1000px;
            height: 800px;
            background: radial-gradient(circle, rgba(79, 110, 247, 0.06) 0%, rgba(255,255,255,0) 80%);
            z-index: -1;
            pointer-events: none;
        }
        /* 导航栏——与首页完全一致 */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(250, 250, 250, 0.78);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-bottom: 1px solid var(--border-light);
            transition: background 0.3s ease;
        }
        .nav-container {
            max-width: 1260px;
            margin: 0 auto;
            padding: 0 28px;
            height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo-box a {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: var(--ink);
            font-weight: 800;
            font-size: 20px;
            letter-spacing: -0.03em;
            gap: 10px;
            white-space: nowrap;
        }
        .logo-img {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            flex-shrink: 0;
        }
        .menu-box {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .menu-box a {
            color: #4b5563;
            text-decoration: none;
            margin-left: 28px;
            font-size: 14.5px;
            font-weight: 600;
            transition: color 0.2s ease;
            position: relative;
            white-space: nowrap;
        }
        .menu-box a:hover,
        .menu-box a.active {
            color: var(--ink);
        }
        .menu-box a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            right: 0;
            height: 2.5px;
            background: var(--blue);
            border-radius: 3px;
        }
        .github-cta {
            background: var(--ink);
            color: #ffffff !important;
            padding: 10px 20px;
            border-radius: 40px;
            font-size: 13.5px !important;
            transition: transform 0.2s, background-color 0.2s !important;
            margin-left: 32px !important;
        }
        .github-cta:hover {
            background: #2d2d44 !important;
            transform: scale(1.03);
            color: #ffffff !important;
        }
        .github-cta::after {
            display: none !important;
        }

        /* Hero区域 */
        .hero-section {
            max-width: 1260px;
            margin: 0 auto;
            padding: 70px 28px 20px 28px;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 52px;
            font-weight: 900;
            line-height: 1.12;
            color: var(--ink);
            margin: 0 auto 16px auto;
            letter-spacing: -0.04em;
            max-width: 800px;
        }
        .hero-section h1 span {
            background: linear-gradient(135deg, #4f6ef7 0%, #f59e4b 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-section .subtitle {
            font-size: 17px;
            color: #5b6578;
            max-width: 620px;
            margin: 0 auto 0 auto;
            line-height: 1.6;
            font-weight: 500;
        }

        /* 下载矩阵——猫咪品种卡片 */
        .download-matrix {
            max-width: 1260px;
            margin: 50px auto 70px auto;
            padding: 0 28px;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .download-card {
            background: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease;
            box-shadow: 0 1px 3px rgba(0,0,0,0.03);
            position: relative;
            overflow: hidden;
        }
        .download-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #4f6ef7, #f59e4b);
            border-radius: 4px 4px 0 0;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .download-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .download-card:hover::before {
            opacity: 1;
        }
        .card-header-meta {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            margin-bottom: 20px;
        }
        .platform-title {
            margin: 0;
            font-size: 26px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .platform-emoji {
            font-size: 32px;
            line-height: 1;
        }
        .platform-tag {
            font-size: 12px;
            font-weight: 700;
            background: #f1f5f9;
            color: #475569;
            padding: 4px 12px;
            border-radius: 20px;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }
        .card-body-meta p {
            font-size: 14.5px;
            color: #5f6b7c;
            line-height: 1.6;
            margin: 0 0 28px 0;
        }
        .architecture-grid {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: auto;
        }
        .btn-download-action {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: var(--ink);
            color: #ffffff;
            text-decoration: none;
            padding: 16px 24px;
            border-radius: 14px;
            font-weight: 600;
            font-size: 14.5px;
            transition: background-color 0.2s, transform 0.2s;
            letter-spacing: -0.01em;
        }
        .btn-download-action:hover {
            background: var(--blue);
        }
        .btn-download-action span.arch-type {
            font-family: ui-monospace, SFMono-Regular, monospace;
            opacity: 0.7;
            font-size: 12px;
            font-weight: 500;
            background: rgba(255,255,255,0.15);
            padding: 3px 10px;
            border-radius: 12px;
        }
        .btn-secondary-action {
            background: #ffffff;
            color: var(--ink);
            border: 1px solid #e2e8f0;
        }
        .btn-secondary-action:hover {
            background: #f8fafc;
            border-color: #cbd5e1;
        }

        /* 新增创意版块：小猫咪领养三步曲 */
        .adoption-steps {
            max-width: 1100px;
            margin: 0 auto 90px auto;
            padding: 0 28px;
            text-align: center;
        }
        .section-heading {
            text-align: center;
            margin: 0 auto 40px auto;
            max-width: 700px;
        }
        .section-heading .label-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #f59e4b;
            background: rgba(245, 158, 75, 0.08);
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .section-heading h2 {
            font-size: 36px;
            font-weight: 900;
            letter-spacing: -0.03em;
            color: var(--ink);
            margin: 0;
        }
        .section-heading h2 span {
            background: linear-gradient(135deg, #4f6ef7, #f59e4b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-heading .sub-note {
            font-size: 15px;
            color: #6b7280;
            margin-top: 8px;
        }
        .steps-row {
            display: flex;
            gap: 22px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 30px;
        }
        .step-card {
            flex: 1 1 200px;
            min-width: 180px;
            max-width: 280px;
            background: #ffffff;
            border: 2px dashed rgba(0, 0, 0, 0.08);
            border-radius: var(--radius-lg);
            padding: 32px 18px;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
        }
        .step-card:hover {
            border-color: var(--blue);
            border-style: solid;
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .step-num {
            display: inline-block;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--blue);
            color: #fff;
            font-weight: 900;
            font-size: 18px;
            line-height: 42px;
            margin-bottom: 14px;
        }
        .step-card h4 {
            font-size: 17px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 6px 0;
            letter-spacing: -0.02em;
        }
        .step-card .step-desc {
            font-size: 13.5px;
            color: #6b7280;
            line-height: 1.55;
            margin: 0;
        }

        /* 新增创意版块：猫咪品种选择器（架构标签） */
        .version-notes {
            max-width: 1260px;
            margin: 0 auto 80px auto;
            padding: 0 28px;
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        .version-card {
            flex: 1 1 220px;
            min-width: 200px;
            background: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: 0 1px 3px rgba(0,0,0,0.03);
            position: relative;
        }
        .version-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(79, 110, 247, 0.15);
        }
        .version-icon {
            font-size: 38px;
            margin-bottom: 10px;
            display: block;
        }
        .version-card h4 {
            font-size: 16px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 6px 0;
            letter-spacing: -0.02em;
        }
        .version-card .version-desc {
            font-size: 13px;
            color: #6b7280;
            line-height: 1.5;
            margin: 0;
        }
        .version-badge {
            display: inline-block;
            margin-top: 10px;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 0.04em;
            color: #f59e4b;
            background: rgba(245, 158, 75, 0.07);
            padding: 3px 10px;
            border-radius: 10px;
            text-transform: uppercase;
        }

        /* 安全审计面板——猫舍安全承诺 */
        .audit-declaration {
            max-width: 1260px;
            margin: 0 auto 100px auto;
            padding: 0 28px;
        }
        .audit-panel {
            background: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: var(--radius-xl);
            padding: 42px 40px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.03);
        }
        .audit-panel h3 {
            margin: 0 0 10px 0;
            font-size: 22px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .audit-panel .panel-sub {
            margin: 0 0 28px 0;
            font-size: 14.5px;
            color: #64748b;
            line-height: 1.6;
        }
        .audit-points {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .audit-item {
            background: #f9fafb;
            border-radius: 16px;
            padding: 24px 20px;
            transition: background 0.2s;
        }
        .audit-item:hover {
            background: #f1f5f9;
        }
        .audit-item h4 {
            margin: 0 0 8px 0;
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .audit-item p {
            margin: 0;
            font-size: 13.5px;
            color: #64748b;
            line-height: 1.5;
        }

        /* Footer */
        footer {
            background: #ffffff;
            border-top: 1px solid rgba(0, 0, 0, 0.04);
            padding: 60px 0 40px 0;
        }
        .footer-container {
            max-width: 1260px;
            margin: 0 auto;
            padding: 0 28px;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 40px;
        }
        .footer-brand h4 {
            margin: 0 0 10px 0;
            font-size: 17px;
            font-weight: 800;
            color: var(--ink);
        }
        .footer-brand p {
            margin: 0;
            font-size: 13.5px;
            color: #6b7280;
            max-width: 300px;
            line-height: 1.6;
        }
        .footer-links-grid {
            display: flex;
            gap: 70px;
        }
        .footer-col h5 {
            margin: 0 0 18px 0;
            font-size: 13px;
            font-weight: 700;
            color: var(--ink);
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col li {
            margin-bottom: 10px;
        }
        .footer-col a {
            text-decoration: none;
            font-size: 13.5px;
            color: #6b7280;
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: var(--ink);
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .download-matrix {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .audit-points {
                grid-template-columns: 1fr 1fr;
                gap: 18px;
            }
            .hero-section h1 {
                font-size: 42px;
            }
            .section-heading h2 {
                font-size: 30px;
            }
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 34px;
            }
            .hero-section .subtitle {
                font-size: 15px;
            }
            .download-matrix,
            .adoption-steps,
            .version-notes,
            .audit-declaration {
                padding: 0 18px;
            }
            .nav-container {
                padding: 0 16px;
                height: 64px;
            }
            .menu-box {
                display: none;
            }
            .footer-container {
                flex-direction: column;
                gap: 36px;
            }
            .footer-links-grid {
                gap: 36px;
                flex-wrap: wrap;
            }
            .steps-row,
            .version-notes {
                flex-direction: column;
                align-items: center;
            }
            .step-card,
            .version-card {
                max-width: 100%;
                width: 100%;
            }
            .audit-points {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .download-card {
                padding: 28px 20px;
            }
            .platform-title {
                font-size: 22px;
            }
        }
        @media (max-width: 420px) {
            .hero-section h1 {
                font-size: 28px;
            }
            .btn-download-action {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }