/* ===== 全直角硬朗风 + 天青石灰 ===== */
    :root {
      --mt-primary: #0891b2;
      --mt-accent: #0ea5e9;
      --mt-bg: #ecfeff;
      --mt-text: #083344;
      --mt-card-bg: #ffffff;
      --mt-border: #083344;
      --mt-shadow: 6px 6px 0 var(--mt-border);
      --mt-shadow-sm: 3px 3px 0 var(--mt-border);
    }

    * {
      box-sizing: border-box;
      border-radius: 0 !important; /* 全直角 */
    }

    body {
      background-color: var(--mt-bg);
      color: var(--mt-text);
      font-family: 'Inter', '思源黑体', -apple-system, sans-serif;
      font-weight: 400;
      letter-spacing: 0.01em;
      overflow-x: hidden;
    }

    h1, h2, h3, .display-font, .navbar-brand {
      font-family: 'Noto Serif SC', '思源宋体', 'Inter', serif;
      font-weight: 900;
      text-transform: uppercase;
      letter-spacing: 0.02em;
    }

    /* 标题大字重，正文正常，反差大 */
    p, li, a, span, div:not(.display-font) {
      font-weight: 400;
    }

    /* 几何色块背景 (圆/方/三角) */
    .geo-bg {
      position: relative;
      isolation: isolate;
    }
    .geo-bg::before, .geo-bg::after {
      content: '';
      position: absolute;
      z-index: -1;
      opacity: 0.1;
      background-color: var(--mt-accent);
      border: 2px solid var(--mt-border);
      pointer-events: none;
    }
    .geo-bg::before {
      width: 180px; height: 180px;
      top: 10%; left: -40px;
      border-radius: 0;
      transform: rotate(25deg);
      background: var(--mt-accent);
    }
    .geo-bg::after {
      width: 130px; height: 130px;
      bottom: 0; right: 5%;
      border-radius: 50%;
      background: var(--mt-primary);
      opacity: 0.15;
    }
    .geo-circle {
      position: absolute;
      width: 80px; height: 80px;
      background: transparent;
      border: 4px solid var(--mt-accent);
      border-radius: 50% !important;
      opacity: 0.3;
      z-index: -1;
    }
    .geo-square {
      position: absolute;
      width: 60px; height: 60px;
      background: transparent;
      border: 4px solid var(--mt-primary);
      z-index: -1;
      opacity: 0.25;
    }
    .geo-triangle {
      width: 0; height: 0;
      border-left: 25px solid transparent;
      border-right: 25px solid transparent;
      border-bottom: 45px solid var(--mt-accent);
      opacity: 0.2;
      position: absolute;
      z-index: -1;
    }

    /* 粗边框与块状硬阴影 */
    .hard-border {
      border: 3px solid var(--mt-border);
      box-shadow: var(--mt-shadow);
    }
    .btn-hard {
      border: 3px solid var(--mt-border);
      background: var(--mt-primary);
      color: white;
      font-weight: 700;
      padding: 0.6rem 1.4rem;
      box-shadow: 5px 5px 0 var(--mt-border);
      transition: 0.1s linear;
      text-transform: uppercase;
      display: inline-block;
      text-decoration: none;
    }
    .btn-hard:hover {
      background: var(--mt-accent);
      box-shadow: 2px 2px 0 var(--mt-border);
      transform: translate(3px, 3px);
      color: white;
    }

    /* 按钮光泽扫过效果 */
    .btn-glossy {
      position: relative;
      overflow: hidden;
      z-index: 1;
    }
    .btn-glossy::after {
      content: '';
      position: absolute;
      top: 0; left: -100%;
      width: 100%; height: 100%;
      background: linear-gradient(120deg, transparent, rgba(255,255,255,0.45), transparent);
      transition: 0.6s;
      z-index: 2;
    }
    .btn-glossy:hover::after {
      left: 120%;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 20px;
    }
    .feature-card {
      background: var(--mt-card-bg);
      border: 3px solid var(--mt-border);
      box-shadow: var(--mt-shadow-sm);
      padding: 1.5rem;
      transition: 0.2s ease;
    }
    .feature-card:hover {
      transform: translate(-2px, -2px);
      box-shadow: 8px 8px 0 var(--mt-border);
    }

    /* 横向时间线/步骤条 */
    .timeline-steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 1rem;
      margin: 2rem 0;
      position: relative;
    }
    .timeline-steps .step-item {
      flex: 1 1 180px;
      border-top: 5px solid var(--mt-primary);
      padding-top: 20px;
      position: relative;
    }
    .timeline-steps .step-item .step-num {
      font-size: 3rem;
      font-weight: 900;
      color: var(--mt-accent);
      display: block;
      line-height: 1;
      text-shadow: 3px 3px 0 rgba(8, 145, 178, 0.2);
    }
    .step-item:not(:last-child)::after {
      content: '→';
      position: absolute;
      right: -18px; top: -5px;
      font-size: 2.5rem;
      color: var(--mt-border);
      font-weight: 900;
    }

    /* 数字滚动动效 */
    .count-num {
      font-size: 3rem;
      font-weight: 900;
      color: var(--mt-primary);
      display: inline-block;
    }

    /* 卡片错落渐显 */
    .reveal-card {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.5s, transform 0.5s;
    }
    .reveal-card.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 导航栏 */
    .navbar-hard {
      background: var(--mt-bg);
      border-bottom: 4px solid var(--mt-border);
      box-shadow: 0 4px 0 var(--mt-accent);
    }
    .navbar-hard .nav-link {
      color: var(--mt-text) !important;
      font-weight: 600;
      border: 2px solid transparent;
      margin: 0 4px;
      padding: 5px 10px;
    }
    .navbar-hard .nav-link:hover {
      border-color: var(--mt-border);
      background: var(--mt-primary);
      color: white !important;
    }

    /* FAQ折叠 */
    .faq-item {
      border: 3px solid var(--mt-border);
      background: white;
      margin-bottom: 1rem;
      box-shadow: 4px 4px 0 var(--mt-border);
    }
    .faq-question {
      padding: 1rem 1.2rem;
      font-weight: 700;
      cursor: pointer;
      background: var(--mt-bg);
      border-bottom: 2px solid var(--mt-border);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding: 1rem 1.2rem;
      display: none;
      border-top: 2px dashed var(--mt-primary);
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* Hero */
    .hero-bg {
      background: linear-gradient(rgba(8, 51, 68, 0.75), rgba(8, 51, 68, 0.75)), url('{随机图片}') center/cover no-repeat;
      border-bottom: 6px solid var(--mt-border);
      box-shadow: inset 0 -8px 0 rgba(8, 51, 68, 0.2);
      color: white;
      padding: 5rem 0;
      position: relative;
    }

    .hero-title {
      font-size: 4rem;
      text-shadow: 6px 6px 0 var(--mt-primary);
    }

    /* 页脚 */
    .footer-hard {
      background: var(--mt-text);
      color: #ecfeff;
      border-top: 6px solid var(--mt-primary);
      margin-top: 3rem;
    }
    .footer-hard a {
      color: #ecfeff;
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    /* 友情链接区 */
    .friend-links {
      background: white;
      border: 4px solid var(--mt-border);
      box-shadow: var(--mt-shadow);
      padding: 1.5rem;
    }

    /* 动效 */
    @keyframes floatGeo {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }
    .geo-float {
      animation: floatGeo 6s infinite ease-in-out;
    }

/* --- 子页面追加 --- */
/* 本页专属样式 */
        .about-hero {
            position: relative;
            padding: 100px 0 80px;
            overflow: hidden;
        }
.about-hero .container {
            position: relative;
            z-index: 2;
        }
.about-section {
            padding: 60px 0;
            position: relative;
        }
.about-section:nth-child(even) {
            background: rgba(8, 145, 178, 0.05);
        }
.about-card {
            background: var(--mt-card-bg);
            border: 2px solid var(--mt-border);
            border-radius: 12px;
            padding: 28px;
            box-shadow: var(--mt-shadow-sm);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
.about-card:hover {
            transform: translate(-3px, -3px);
            box-shadow: var(--mt-shadow);
        }
.about-card i {
            font-size: 2.5rem;
            color: var(--mt-primary);
            margin-bottom: 16px;
        }
.about-card h3 {
            color: var(--mt-primary);
            font-weight: 700;
            font-size: 1.3rem;
            margin-bottom: 14px;
        }
.about-card p {
            color: var(--mt-text);
            line-height: 1.7;
            margin-bottom: 0;
        }
.about-badge {
            display: inline-block;
            background: var(--mt-primary);
            color: #fff;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
.about-hero-title {
            font-size: 3.2rem;
            font-weight: 900;
            color: var(--mt-text);
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 20px;
        }
.about-hero-sub {
            font-size: 1.15rem;
            color: rgba(8, 51, 68, 0.75);
            max-width: 700px;
            line-height: 1.8;
        }
.about-stats {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 2px solid var(--mt-border);
        }
.about-stat {
            text-align: center;
            padding: 20px 10px;
        }
.about-stat .count-num {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--mt-primary);
            display: block;
            margin-bottom: 6px;
        }
.about-stat span:last-child {
            color: var(--mt-text);
            font-weight: 600;
            font-size: 1rem;
        }
.story-timeline {
            position: relative;
            padding-left: 40px;
        }
.story-timeline::before {
            content: '';
            position: absolute;
            left: 12px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--mt-primary);
            border-radius: 2px;
        }
.story-item {
            position: relative;
            margin-bottom: 35px;
            padding: 20px 24px;
            background: var(--mt-card-bg);
            border: 2px solid var(--mt-border);
            border-radius: 10px;
            box-shadow: var(--mt-shadow-sm);
        }
.story-item::before {
            content: '';
            position: absolute;
            left: -34px;
            top: 22px;
            width: 16px;
            height: 16px;
            background: var(--mt-accent);
            border: 3px solid var(--mt-border);
            border-radius: 50%;
        }
.story-item .year {
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--mt-accent);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            display: block;
        }
.story-item h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--mt-text);
            margin-bottom: 8px;
        }
.story-item p {
            color: rgba(8, 51, 68, 0.8);
            line-height: 1.7;
            margin-bottom: 0;
        }
.feature-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
.feature-list li {
            padding: 12px 0;
            border-bottom: 1px dashed rgba(8, 51, 68, 0.2);
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }
.feature-list li:last-child {
            border-bottom: none;
        }
.feature-list li i {
            color: var(--mt-primary);
            font-size: 1.1rem;
            margin-top: 3px;
            flex-shrink: 0;
        }
.feature-list li span {
            color: var(--mt-text);
            line-height: 1.6;
        }
.value-tag {
            display: inline-block;
            background: rgba(14, 165, 233, 0.15);
            color: var(--mt-primary);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin: 4px;
        }
.nav-link.active {
            color: var(--mt-primary) !important;
            font-weight: 700;
        }
.about-hero .geo-float {
            position: absolute;
            z-index: 1;
        }
.about-hero {
                padding: 70px 0 50px;
            }
.about-hero-title {
                font-size: 2.2rem;
            }
.about-hero-sub {
                font-size: 1rem;
            }
.about-stat .count-num {
                font-size: 2rem;
            }
.story-timeline {
                padding-left: 30px;
            }
.story-item::before {
                left: -26px;
                width: 12px;
                height: 12px;
            }

/* --- 子页面追加 --- */
/* 确保隐私页与首页风格完全一致，但允许少量微调 */
        .privacy-title {
            font-weight: 900;
            letter-spacing: -0.02em;
        }
.privacy-hero {
            background: var(--mt-bg);
            border-bottom: 3px solid var(--mt-border);
        }
.privacy-section {
            background-color: var(--mt-card-bg);
            border: 2px solid var(--mt-border);
            box-shadow: var(--mt-shadow-sm);
            padding: 1.8rem 1.8rem;
            margin-bottom: 2.5rem;
            transition: box-shadow .2s;
        }
.privacy-section:hover {
            box-shadow: var(--mt-shadow);
        }
.privacy-section h2 {
            font-weight: 800;
            font-size: 1.75rem;
            color: var(--mt-primary);
            border-left: 8px solid var(--mt-accent);
            padding-left: 1rem;
            margin-bottom: 1.5rem;
        }
.privacy-section h3 {
            font-weight: 700;
            font-size: 1.4rem;
            color: var(--mt-text);
            margin-top: 1.8rem;
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
.privacy-section p, .privacy-section li {
            color: var(--mt-text);
            line-height: 1.8;
        }
.privacy-list {
            list-style-type: none;
            padding-left: 0;
        }
.privacy-list li {
            padding: 0.4rem 0 0.4rem 2rem;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="%230891b2" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>') left center no-repeat;
            background-size: 1.2rem;
        }
.privacy-badge {
            display: inline-block;
            background: var(--mt-primary);
            color: white;
            font-size: 0.9rem;
            font-weight: 600;
            padding: 0.2rem 0.8rem;
            border-radius: 30px;
            margin-right: 0.5rem;
            border: 2px solid var(--mt-border);
            box-shadow: 2px 2px 0 var(--mt-border);
        }
.footer-hard .friend-links a {
            color: var(--mt-text);
        }

/* --- 子页面追加 --- */
.disclaimer-section { padding: 60px 0; }
.disclaimer-card { background: var(--mt-card-bg); border: 2px solid var(--mt-border); border-radius: 12px; padding: 30px; margin-bottom: 25px; box-shadow: var(--mt-shadow-sm); }
.disclaimer-card h2 { color: var(--mt-primary); font-weight: 800; font-size: 1.4rem; margin-bottom: 15px; }
.disclaimer-card h3 { color: var(--mt-text); font-weight: 700; font-size: 1.1rem; margin-top: 20px; margin-bottom: 10px; }
.disclaimer-card p, .disclaimer-card li { color: var(--mt-text); line-height: 1.8; font-size: 0.95rem; }
.disclaimer-card ul { padding-left: 20px; margin-bottom: 15px; }
.disclaimer-card ul li { margin-bottom: 8px; }
.highlight-box { background: rgba(8, 145, 178, 0.08); border-left: 4px solid var(--mt-primary); padding: 15px 20px; margin: 20px 0; border-radius: 0 8px 8px 0; }
.highlight-box p { margin: 0; font-weight: 500; }
.effective-date { text-align: center; padding: 20px 0; color: var(--mt-text); font-weight: 500; }
.back-home-btn { text-align: center; margin: 30px 0; }
.back-home-btn a { display: inline-block; }
.active-nav { color: var(--mt-primary) !important; font-weight: 700; }