:root {
            --canvas-bg: #f8fafc;
            --surface-bg: rgba(255, 255, 255, 0.45);
            --surface-border: rgba(255, 255, 255, 0.7);
            --stroke-color: rgba(15, 23, 42, 0.04);
            --text-main: #0f172a;
            --text-muted: #475569;
            --text-accent: #4f46e5;
            --brand-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ed64a6 100%);
            --card-radius: 18px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--canvas-bg);
            color: var(--text-main);
            line-height: 1.7;
            overflow-x: hidden;
            position: relative;
        }

        body::before {
            content: "";
            position: fixed;
            top: -15%;
            left: -8%;
            width: 55vw;
            height: 55vw;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.10) 0%, rgba(255, 255, 255, 0) 70%);
            z-index: -1;
            pointer-events: none;
        }

        /* 导航栏（与首页一致） */
        .navbar {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(248, 250, 252, 0.78);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(15, 23, 42, 0.05);
            height: 72px;
            animation: fadeIn 0.7s ease both;
        }

        .navbar-container {
            max-width: 1400px;
            margin: 0 auto;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 48px;
        }

        .nav-brand a {
            text-decoration: none;
            color: var(--text-main);
            font-size: 19px;
            font-weight: 800;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.4px;
        }

        .nav-brand img {
            width: 30px;
            height: 30px;
            object-fit: contain;
        }

        .nav-right-zone {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .nav-menu {
            display: flex;
            gap: 4px;
        }

        .nav-item {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 13.5px;
            font-weight: 600;
            padding: 7px 16px;
            border-radius: 9px;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .nav-item:hover {
            color: var(--text-accent);
            background: rgba(79, 70, 229, 0.05);
        }

        .nav-item.active {
            color: #fff;
            background: var(--text-main);
            box-shadow: 0 3px 10px rgba(15, 23, 42, 0.14);
        }

        .btn-github {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 7px 15px;
            border-radius: 9px;
            background: #fff;
            border: 1px solid var(--surface-border);
            color: var(--text-main);
            text-decoration: none;
            font-size: 13px;
            font-weight: 600;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
            transition: all 0.25s ease;
        }

        .btn-github:hover {
            background: #f1f5f9;
            border-color: rgba(15, 23, 42, 0.14);
            transform: translateY(-1px);
        }

        .btn-github svg {
            width: 15px;
            height: 15px;
            fill: currentColor;
        }

        /* 页面头部 */
        .page-header {
            max-width: 1400px;
            margin: 64px auto 36px auto;
            padding: 0 48px;
            text-align: center;
            animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) both;
        }

        .header-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 5px 15px;
            background: #fff;
            border: 1px solid var(--surface-border);
            border-radius: 28px;
            font-size: 12.5px;
            font-weight: 600;
            color: var(--text-accent);
            box-shadow: 0 3px 16px rgba(0, 0, 0, 0.02);
            margin-bottom: 24px;
        }

        .badge-dot {
            width: 5px;
            height: 5px;
            background: var(--text-accent);
            border-radius: 50%;
            display: inline-block;
            animation: pulse-dot 2s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.45;
                transform: scale(1.6);
            }
        }

        .page-title {
            font-size: 48px;
            font-weight: 900;
            letter-spacing: -1.5px;
            line-height: 1.15;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #0f172a 30%, #3b82f6 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-subtitle {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 720px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* 通用区块标题 */
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-eyebrow {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.6px;
            color: var(--text-accent);
            margin-bottom: 8px;
            display: block;
        }

        .section-title {
            font-size: 32px;
            font-weight: 900;
            letter-spacing: -0.8px;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* 项目起源 */
        .origin-section {
            max-width: 1400px;
            margin: 0 auto 80px auto;
            padding: 0 48px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .origin-visual {
            background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
            border-radius: var(--card-radius);
            aspect-ratio: 4/3;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
        }

        .origin-visual img {
            max-width: 80%;
            height: auto;
            opacity: 0.8;
        }

        .origin-content h2 {
            font-size: 28px;
            font-weight: 900;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }

        .origin-content p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.75;
            margin-bottom: 16px;
        }

        /* 核心价值卡片 */
        .values-section {
            max-width: 1400px;
            margin: 0 auto 80px auto;
            padding: 0 48px;
        }

        .values-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
        }

        .value-card {
            background: #fff;
            border: 1px solid var(--surface-border);
            border-radius: var(--card-radius);
            padding: 32px 24px;
            text-align: center;
            box-shadow: 0 4px 18px rgba(15, 23, 42, 0.02);
            transition: transform 0.3s ease;
        }

        .value-card:hover {
            transform: translateY(-4px);
        }

        .value-icon {
            font-size: 40px;
            margin-bottom: 16px;
        }

        .value-card h3 {
            font-size: 18px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .value-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 技术架构亮点 */
        .tech-section {
            max-width: 1400px;
            margin: 0 auto 80px auto;
            padding: 0 48px;
        }

        .tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        .tech-card {
            background: #fff;
            border: 1px solid var(--surface-border);
            border-radius: var(--card-radius);
            padding: 28px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: transform 0.3s ease;
        }

        .tech-card:hover {
            transform: translateY(-3px);
        }

        .tech-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(79, 70, 229, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-accent);
            flex-shrink: 0;
        }

        .tech-info h3 {
            font-size: 17px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 6px;
        }

        .tech-info p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 里程碑时间线 */
        .milestone-section {
            max-width: 1400px;
            margin: 0 auto 80px auto;
            padding: 0 48px;
        }

        .timeline {
            position: relative;
            max-width: 700px;
            margin: 0 auto;
            padding-left: 40px;
        }

        .timeline::before {
            content: "";
            position: absolute;
            left: 18px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--stroke-color);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 32px;
            padding-left: 28px;
        }

        .timeline-dot {
            position: absolute;
            left: -30px;
            top: 4px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--text-accent);
            border: 3px solid #fff;
            box-shadow: 0 0 0 2px var(--text-accent);
        }

        .timeline-date {
            font-size: 12px;
            font-weight: 700;
            color: var(--text-accent);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 6px;
        }

        .timeline-title {
            font-size: 17px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 6px;
        }

        .timeline-desc {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* 社区数据 */
        .community-section {
            max-width: 1400px;
            margin: 0 auto 80px auto;
            padding: 0 48px;
        }

        .stats-row {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
        }

        .stat-item {
            text-align: center;
            min-width: 100px;
        }

        .stat-number {
            font-size: 36px;
            font-weight: 900;
            background: var(--brand-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* 联系与协作 */
        .contact-section {
            max-width: 1400px;
            margin: 0 auto 100px auto;
            padding: 0 48px;
            text-align: center;
        }

        .contact-card {
            display: inline-block;
            background: #fff;
            border: 1px solid var(--surface-border);
            border-radius: var(--card-radius);
            padding: 36px 48px;
            box-shadow: 0 8px 30px rgba(15, 23, 42, 0.03);
            text-align: left;
            max-width: 500px;
            width: 100%;
        }

        .contact-card h3 {
            font-size: 20px;
            font-weight: 800;
            margin-bottom: 12px;
        }

        .contact-card p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .contact-card a {
            color: var(--text-accent);
            font-weight: 600;
            text-decoration: none;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 11px;
            font-size: 14.5px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            margin-top: 16px;
        }

        .btn-primary {
            background: var(--brand-gradient);
            color: #fff;
            box-shadow: 0 7px 26px rgba(79, 70, 229, 0.24);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 11px 32px rgba(79, 70, 229, 0.34);
        }

        /* 页脚（与首页一致） */
        .footer {
            background-color: #fff;
            color: var(--text-muted);
            padding: 64px 48px;
            border-top: 1px solid rgba(15, 23, 42, 0.05);
            position: relative;
            z-index: 2;
        }

        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 52px;
        }

        .footer-brand-side {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .footer-brand-title {
            font-size: 15px;
            font-weight: 800;
            color: var(--text-main);
        }

        .footer-text {
            font-size: 12.5px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .footer-nav-col {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .footer-col-title {
            font-size: 13px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 0.4px;
        }

        .footer-links-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            list-style: none;
        }

        .footer-links-list a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 12.5px;
            font-weight: 500;
            transition: color 0.2s ease;
        }

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

        /* 动画 */
        @keyframes fadeIn {
            from {
                opacity: 0;
            }
            to {
                opacity: 1;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(28px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .origin-section {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .page-title {
                font-size: 38px;
            }
            .section-title {
                font-size: 28px;
            }
        }
        @media (max-width: 768px) {
            .navbar-container {
                padding: 0 20px;
            }
            .nav-menu {
                display: none;
            }
            .page-header {
                padding: 0 20px;
                margin: 40px auto 24px auto;
            }
            .page-title {
                font-size: 30px;
            }
            .origin-section,
            .values-section,
            .tech-section,
            .milestone-section,
            .community-section,
            .contact-section {
                padding: 0 20px;
                margin-bottom: 60px;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer {
                padding: 48px 24px;
            }
            .timeline {
                padding-left: 30px;
            }
        }