/* 森林绿原木 (浅色背景) */
        :root {
            --primary: #16a34a;
            --accent: #84cc16;
            --bg: #f7fee7;
            --text: #1a2e05;
            --border: #3f6212;
            --white: #ffffff;
            --soft-glow: rgba(132, 204, 22, 0.25);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            background-color: var(--bg);
            color: var(--text);
            font-family: 'Inter', sans-serif;
            line-height: 1.7;
            position: relative;
            overflow-x: hidden;
        }

        h1, h2, h3, .navbar-brand, .display-3, .font-title {
            font-family: 'Quicksand', 'Inter', sans-serif;
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        /* 渐变光晕/模糊光斑点缀 */
        .glow-spot {
            position: absolute;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(132, 204, 22, 0.25) 0%, transparent 70%);
            filter: blur(50px);
            pointer-events: none;
            z-index: 0;
            border-radius: 50%;
        }
        .glow-spot-1 { top: 120px; left: -100px; }
        .glow-spot-2 { bottom: 300px; right: -80px; background: rgba(22, 163, 74, 0.2); }

        /* 极简无阴影，纯描边 */
        .no-shadow, .card, .timeline-item, .feature-card, .faq-item, .section-box {
            box-shadow: none !important;
            border: 2px solid var(--border);
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.6);
            backdrop-filter: blur(2px);
        }

        /* 导航 */
        .navbar {
            border-bottom: 2px solid var(--border);
            background: rgba(247, 254, 231, 0.9);
            backdrop-filter: blur(8px);
            z-index: 100;
            padding: 0.8rem 0;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary) !important;
            letter-spacing: -0.03em;
        }
        .navbar-nav .nav-link {
            color: var(--text) !important;
            font-weight: 500;
            margin: 0 1rem;
            border-bottom: 2px solid transparent;
            transition: 0.2s;
            font-size: 1.05rem;
        }
        .navbar-nav .nav-link:hover { border-bottom-color: var(--accent); color: var(--primary) !important; }

        /* Hero 主视觉压暗 */
        .hero-section {
            position: relative;
            background-image: url('{随机图片}'); /* 程序替换，这里使用占位符 */
            background-size: cover;
            background-position: center;
            background-color: #2b3b1a; /* 深色底 */
            padding: 6rem 0 5rem;
            isolation: isolate;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: rgba(20, 35, 0, 0.65); /* 压暗 */
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 3;
            color: white;
            text-shadow: 0 2px 6px rgba(0,0,0,0.4);
        }
        .hero-title {
            font-size: 3.8rem;
            font-weight: 800;
            line-height: 1.2;
        }
        .hero-sub {
            font-size: 1.3rem;
            font-weight: 400;
            opacity: 0.95;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-hero {
            border: 2px solid white;
            color: white;
            padding: 0.7rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: 0.3s;
            background: transparent;
            backdrop-filter: blur(4px);
            margin-top: 1.2rem;
        }
        .btn-hero:hover { background: var(--accent); border-color: var(--accent); color: #1a2e05; }

        /* 区块标题 */
        .section-title {
            font-size: 2.4rem;
            font-weight: 700;
            display: inline-block;
            border-bottom: 4px solid var(--accent);
            padding-bottom: 0.3rem;
            margin-bottom: 2.5rem;
        }

        /* 时间线 (使用说明) */
        .timeline {
            position: relative;
            padding-left: 2.2rem;
            border-left: 3px dashed var(--primary);
        }
        .timeline-item {
            position: relative;
            padding: 1.5rem 1.8rem;
            margin-bottom: 2rem;
            background: rgba(255,255,255,0.75);
            border: 2px solid var(--border);
            border-radius: 20px;
        }
        .timeline-item::before {
            content: "";
            position: absolute;
            left: -2.6rem;
            top: 1.8rem;
            width: 18px;
            height: 18px;
            background: var(--accent);
            border: 3px solid var(--bg);
            border-radius: 50%;
            box-shadow: 0 0 0 3px var(--primary);
        }
        .timeline-step {
            font-family: 'Quicksand';
            font-weight: 700;
            color: var(--primary);
            font-size: 1.6rem;
            margin-right: 0.8rem;
        }

        /* 特色网格卡片 */
        .feature-card {
            background: rgba(255, 255, 255, 0.8);
            padding: 1.8rem 1.5rem;
            transition: 0.25s;
            border: 2px solid var(--border);
        }
        .feature-card:hover { border-color: var(--primary); background: white; }
        .feature-icon { font-size: 2.8rem; color: var(--primary); }

        /* 标签页切换 */
        .nav-tabs .nav-link {
            color: var(--text);
            border: 2px solid var(--border);
            border-radius: 40px;
            margin: 0 0.4rem;
            font-weight: 600;
            background: transparent;
        }
        .nav-tabs .nav-link.active {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        /* 表格样式（中部对比） */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border: 2px solid var(--border);
            border-radius: 16px;
            overflow: hidden;
        }
        .compare-table th, .compare-table td {
            padding: 1.2rem 1rem;
            border-bottom: 2px solid var(--border);
            background: rgba(255, 255, 240, 0.5);
            text-align: center;
        }
        .compare-table tr:last-child td { border-bottom: none; }
        .compare-table .highlight-col { background: rgba(132, 204, 22, 0.15); }

        /* FAQ 手风琴 */
        .faq-item {
            background: rgba(255,255,255,0.8);
            border: 2px solid var(--border);
            border-radius: 14px;
            margin-bottom: 1rem;
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            text-align: left;
            font-size: 1.25rem;
            font-weight: 600;
            padding: 1.4rem 2rem 1rem 2rem;
            color: var(--text);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question i { transition: transform 0.3s; }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            padding: 0 2rem;
            color: #2c3e1e;
            border-top: 1px solid transparent;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding-bottom: 1.4rem;
            border-top-color: var(--border);
        }
        .faq-item.active .faq-question i { transform: rotate(180deg); }

        /* 回到顶部按钮 */
        #backToTop {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary);
            color: white;
            border: 2px solid white;
            font-size: 1.4rem;
            display: none;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 200;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            transition: opacity 0.3s;
        }
        #backToTop.visible { display: flex; }

        /* 滚动淡入动画 */
        .fade-in-section {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-in-section.is-visible {
            opacity: 1;
            transform: none;
        }

        /* 友情链接 */
        .friend-links {
            border-top: 2px dashed var(--border);
            padding: 1.5rem 0;
            margin-top: 2.5rem;
        }
        .friend-links a { color: var(--primary); text-decoration: none; margin-right: 1.5rem; }

        footer {
            border-top: 3px solid var(--border);
            background: rgba(255,255,255,0.7);
            color: #1e3a0c;
            font-weight: 500;
        }

        /* 细节 */
        .big-number { font-size: 3.2rem; font-weight: 800; color: var(--primary); }
        .label-text { font-size: 0.9rem; letter-spacing: 1px; }

        @media (max-width: 768px) {
            .hero-title { font-size: 2.6rem; }
            .navbar-collapse { background: var(--bg); padding: 1rem; border-radius: 12px; }
        }

/* --- 子页面追加 --- */
.about-hero { background: linear-gradient(135deg, var(--bg) 0%, rgba(132,204,22,0.15) 100%); padding: 80px 0 60px; position: relative; overflow: hidden; }
.about-hero .container { position: relative; z-index: 2; }
.about-section { padding: 60px 0; }
.about-section:nth-child(even) { background: rgba(132,204,22,0.08); }
.about-card { background: var(--white); border-radius: 20px; padding: 40px; box-shadow: 0 10px 40px rgba(0,0,0,0.08); transition: transform 0.3s ease, box-shadow 0.3s ease; height: 100%; }
.about-card:hover { transform: translateY(-5px); box-shadow: 0 20px 60px rgba(22,163,74,0.15); }
.about-icon { width: 64px; height: 64px; border-radius: 16px; display: flex; align-items: center; justify-content: center; background: var(--soft-glow); color: var(--primary); font-size: 28px; margin-bottom: 20px; }
.about-card h3 { color: var(--primary); font-size: 20px; font-weight: 700; margin-bottom: 15px; }
.about-card p { color: var(--text); font-size: 15px; line-height: 1.8; opacity: 0.9; }
.stat-number { font-size: 48px; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 8px; }
.stat-label { color: var(--text); font-size: 14px; font-weight: 500; opacity: 0.7; }
.about-quote { background: var(--white); border-left: 4px solid var(--primary); padding: 30px 40px; border-radius: 0 20px 20px 0; margin: 40px 0; box-shadow: 0 5px 30px rgba(0,0,0,0.05); }
.about-quote p { font-size: 18px; font-style: italic; color: var(--text); margin: 0; line-height: 1.8; }
.about-quote .quote-author { font-style: normal; font-size: 14px; color: var(--primary); margin-top: 12px; font-weight: 600; }
.timeline::before { content: ''; position: absolute; left: 24px; top: 0; bottom: 0; width: 3px; background: linear-gradient(to bottom, var(--primary), var(--accent)); border-radius: 2px; }
.timeline-content { background: var(--white); border-radius: 15px; padding: 25px 30px; box-shadow: 0 5px 20px rgba(0,0,0,0.06); }
.timeline-content h4 { color: var(--primary); font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.timeline-content p { color: var(--text); font-size: 15px; line-height: 1.7; opacity: 0.9; margin: 0; }
.value-list { list-style: none; padding: 0; }
.value-list li { display: flex; align-items: flex-start; margin-bottom: 20px; color: var(--text); font-size: 15px; line-height: 1.7; }
.value-list li i { color: var(--primary); margin-right: 15px; font-size: 20px; flex-shrink: 0; margin-top: 2px; }
.friend-links .container { display: flex; justify-content: center; }
.friend-links a:hover { opacity: 1; }