/* 全局创意重置 — 快速、现代 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f9fbfd;
            color: #0a1e2f;
            line-height: 1.5;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* 导航 — 与首页一致 */
        header {
            background: rgba(255,255,255,0.94);
            backdrop-filter: blur(12px);
            box-shadow: 0 2px 12px rgba(0,0,0,0.02);
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid #e2eaf2;
        }
        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 14px 0;
        }
        .logo-area h1 {
            font-size: 1.8rem;
            font-weight: 750;
            background: linear-gradient(145deg, #0f2b4b, #2563eb);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.4px;
        }
        .logo-area p {
            font-size: 0.75rem;
            color: #54708f;
            margin-top: 4px;
        }
        .nav-links {
            display: flex;
            gap: 1.8rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: #1e2f44;
            transition: color 0.15s;
            font-size: 0.95rem;
        }
        .nav-links a:hover, .nav-links a.active {
            color: #2563eb;
        }

        /* 页面标题区 */
        .mission-hero {
            text-align: center;
            margin: 48px 0 32px;
        }
        .mission-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0a1c2f, #1e4bd2);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }
        .sub-mission {
            font-size: 1.2rem;
            color: #2e4b6e;
            margin-top: 8px;
        }
        .progress-summary {
            background: white;
            border-radius: 60px;
            padding: 16px 32px;
            display: inline-block;
            margin-top: 24px;
            box-shadow: 0 8px 18px rgba(0,0,0,0.02);
            border: 1px solid #d4e2f5;
        }
        .progress-text {
            font-weight: 700;
            font-size: 1.2rem;
        }

        /* 任务卡片区 */
        .tasks-grid {
            display: flex;
            flex-direction: column;
            gap: 32px;
            margin: 40px 0 50px;
        }
        .task-card {
            background: white;
            border-radius: 48px;
            padding: 36px 40px;
            box-shadow: 0 25px 40px -16px rgba(0,35,70,0.06);
            border: 1px solid #eaf0fa;
            transition: transform 0.2s;
            position: relative;
            overflow: hidden;
        }
        .task-card.completed {
            border-left: 12px solid #10b981;
            background: #fbfeff;
        }
        .task-header {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-bottom: 24px;
        }
        .task-number {
            background: #1e3b63;
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            font-weight: 800;
        }
        .task-title {
            font-size: 2rem;
            font-weight: 750;
            flex: 1;
        }
        .complete-btn {
            background: #eef4ff;
            border: none;
            padding: 12px 28px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1rem;
            color: #1e3b63;
            cursor: pointer;
            transition: all 0.15s;
            border: 1.5px solid transparent;
        }
        .complete-btn:hover {
            background: #2563eb;
            color: white;
        }
        .complete-btn.done {
            background: #10b981;
            color: white;
            border-color: #10b981;
        }
        .task-content {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 30px;
        }
        .task-steps {
            list-style: none;
        }
        .task-steps li {
            margin-bottom: 18px;
            display: flex;
            align-items: flex-start;
            gap: 14px;
            font-size: 1.05rem;
        }
        .step-check {
            color: #10b981;
            font-weight: bold;
            font-size: 1.4rem;
        }
        .task-visual {
            background: #f2f8ff;
            border-radius: 36px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .code-mini {
            background: #0a1c2f;
            color: #bdd3ff;
            padding: 12px 16px;
            border-radius: 24px;
            font-family: monospace;
            font-size: 0.9rem;
            margin-top: 16px;
        }

        /* 号召下载区域 */
        .cta-tutorial {
            background: linear-gradient(145deg, #0f2b4b, #1e3a5f);
            border-radius: 60px;
            padding: 52px 48px;
            margin: 60px 0 40px;
            color: white;
            text-align: center;
        }
        .cta-tutorial h3 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        .btn-download-large {
            background: white;
            color: #0f2b4b;
            padding: 18px 54px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.3rem;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
            transition: 0.2s;
            border: none;
            cursor: pointer;
        }

        /* 底部 — 完全一致 */
        footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 40px 0 24px;
            margin-top: 20px;
            border-top: 1px solid #1e293b;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }
        .footer-copyright {
            text-align: center;
            padding-top: 32px;
            font-size: 0.85rem;
            border-top: 1px solid #1e293b;
            margin-top: 24px;
        }

        @media (max-width: 700px) {
            .task-content {
                grid-template-columns: 1fr;
            }
            .mission-hero h1 {
                font-size: 2.2rem;
            }
            .task-card {
                padding: 24px;
            }
            .header-flex {
                flex-direction: column;
                gap: 12px;
            }
        }