/* =====================================================================
 * 响应式适配
 * 桌面优先：1200px 基准
 * 平板：768-1024px，导航折叠为汉堡，3 列变 2 列
 * 手机：< 768px，单列布局
 * ===================================================================== */

/* ============ 平板（≤ 1024px）============ */
@media (max-width: 1024px) {
    :root {
        --sp-section: 56px;
    }

    .container { padding: 0 16px; }

    /* 顶部条 */
    .top-bar { font-size: 12px; }
    .top-tip { display: none; }

    /* 导航折叠 */
    .nav-toggle { display: flex; }
    .main-nav {
        position: fixed;
        top: 0;
        right: -80%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--c-white);
        box-shadow: -4px 0 30px rgba(0,0,0,0.15);
        padding: 70px 16px 30px;
        overflow-y: auto;
        transition: right var(--t-base);
        z-index: 95;
    }
    .main-nav.active { right: 0; }
    .main-nav > ul { flex-direction: column; gap: 4px; align-items: stretch; }
    .main-nav > ul > li > a { padding: 14px 18px; font-size: 16px; border-radius: var(--r-md); }
    .main-nav > ul > li > a.nav-cta { text-align: center; }
    .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0 0 0 18px;
        background: var(--c-bg);
        border-radius: var(--r-md);
        margin-top: 4px;
        display: none;
    }
    .has-sub.open .submenu { display: block; }

    /* Hero */
    .hero-slider { height: 380px; }
    .slide-title { font-size: 30px; }
    .slide-subtitle { font-size: 15px; }
    .hero-title { font-size: 30px; }
    .hero-sub { font-size: 15px; }

    /* 业务卡片：4 列 → 2 列 */
    .business-grid { grid-template-columns: repeat(2, 1fr); }

    /* 优势：4 列 → 2 列 */
    .advantage-grid { grid-template-columns: repeat(2, 1fr); }
    .philosophy-grid { grid-template-columns: repeat(2, 1fr); }

    /* 案例：3 列 → 2 列 */
    .cases-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: repeat(2, 1fr); }

    /* 服务流程：横向 → 2 列 */
    .process-flow { gap: 12px; }
    .process-step { min-width: calc(50% - 6px); }
    .process-arrow { display: none; }

    /* 关于我们：左右 → 上下 */
    .about-wrap { flex-direction: column; gap: 30px; }
    .about-image { flex: none; width: 100%; }
    .about-image img { max-width: 600px; margin: 0 auto; }

    /* 业务列表块 */
    .biz-list-item, .biz-list-item.reverse { flex-direction: column; }
    .biz-list-img { flex: none; width: 100%; }
    .biz-list-img img { max-height: 320px; }

    /* 详情页 */
    .detail-wrap { flex-direction: column; }
    .detail-side { flex: none; width: 100%; position: static; flex-direction: row; flex-wrap: wrap; }
    .detail-side > * { flex: 1; min-width: 260px; }

    /* 预约 */
    .booking-wrap { flex-direction: column; }
    .booking-info { flex: none; width: 100%; }

    /* 联系 */
    .contact-wrap { flex-direction: column; }
    .contact-map-wrap { flex-direction: column; }
    .contact-map { flex: none; width: 100%; }
    .contact-map-info { flex: none; width: 100%; }

    /* 联系卡片 - 平板保持横排 */
    .contact-cards { gap: 16px; }
    .contact-cards > .contact-card { padding: 24px 18px; }

    /* 案例 gallery */
    .case-gallery { grid-template-columns: repeat(2, 1fr); }

    /* FAQ 速览 */
    .faq-mini-list { grid-template-columns: repeat(2, 1fr); }

    /* 新闻列表横排 */
    .news-list-img { flex: 0 0 180px; }

    /* 底部 */
    .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }

    /* CTA */
    .cta-wrap { flex-direction: column; text-align: center; }
}

/* ============ 手机（≤ 768px）============ */
@media (max-width: 768px) {
    :root {
        --sp-section: 40px;
    }

    body { font-size: 14px; }
    .container { padding: 0 14px; }
    .section { padding: var(--sp-section) 0; }

    /* 顶部条 */
    .top-bar .container { justify-content: center; }
    .top-bar-left { display: none; }

    /* 头部 */
    .header-flex { padding: 10px 14px; gap: 14px; }
    .logo-main { font-size: 18px; }
    .logo-sub { font-size: 9px; }
    .logo-img { height: 40px; }

    /* Hero */
    .hero-slider { height: 280px; }
    .slide-content { max-width: 90%; }
    .slide-title { font-size: 22px; margin-bottom: 10px; }
    .slide-subtitle { font-size: 13px; margin-bottom: 16px; }
    .slide-btn { padding: 10px 22px; font-size: 14px; }
    .slider-arrow { width: 38px; height: 38px; line-height: 38px; font-size: 22px; }
    .slider-arrow.prev { left: 10px; }
    .slider-arrow.next { right: 10px; }
    .slider-dots .dot { width: 8px; height: 8px; }
    .slider-dots .dot.active { width: 22px; }

    .hero-default { padding: 56px 0; }
    .hero-title { font-size: 24px; }
    .hero-sub { font-size: 14px; margin-bottom: 22px; }
    .hero-actions { flex-direction: column; gap: 10px; }
    .hero-actions .btn { width: 80%; margin: 0 auto; }

    /* section 头 */
    .section-title { font-size: 22px; }
    .section-head { margin-bottom: 26px; }

    /* 业务卡片：1 列 */
    .business-grid { grid-template-columns: 1fr; }
    .business-img { aspect-ratio: 360 / 200; }

    /* 优势 */
    .advantage-grid { grid-template-columns: 1fr; }
    .philosophy-grid { grid-template-columns: 1fr; }
    .advantage-card, .philosophy-item { padding: 22px 18px; }
    .advantage-text, .process-text { padding: 18px; font-size: 13px; }

    /* 案例 */
    .cases-grid { grid-template-columns: 1fr; }
    .case-img { aspect-ratio: 16 / 10; }

    /* 新闻 */
    .news-grid { grid-template-columns: 1fr; }
    .faq-mini-list { grid-template-columns: 1fr; }

    /* 流程 */
    .process-step { min-width: 100%; padding: 18px; }
    .step-num { width: 40px; height: 40px; line-height: 40px; font-size: 18px; }

    /* 关于 */
    .about-title { font-size: 22px; }
    .about-stats { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .stat-num { font-size: 24px; }

    /* 服务区域 */
    .area-tag { padding: 8px 18px; font-size: 13px; }

    /* 业务列表 */
    .biz-list-info { padding: 22px; }
    .biz-list-title { font-size: 20px; }
    .biz-list-tags .biz-tag { font-size: 11px; padding: 4px 10px; }

    /* 详情 */
    .detail-article { padding: 20px; }
    .detail-title { font-size: 20px; }
    .detail-side { flex-direction: column; }
    .scope-grid { grid-template-columns: 1fr; }
    .case-gallery { grid-template-columns: repeat(2, 1fr); }
    .detail-cta { padding: 20px; }
    .detail-cta .btn { width: 100%; margin-bottom: 8px; }

    /* 筛选 */
    .filter-bar { padding: 14px; gap: 8px; }
    .filter-tag { padding: 6px 14px; font-size: 13px; }

    /* 新闻列表 */
    .news-list-item { flex-direction: column; padding: 14px; }
    .news-list-img { flex: none; width: 100%; }
    .news-list-title { font-size: 16px; }

    /* FAQ */
    .faq-q { padding: 14px 16px; font-size: 14px; gap: 10px; }
    .faq-q-icon { width: 28px; height: 28px; line-height: 28px; flex-basis: 28px; font-size: 12px; }
    .faq-a-inner { padding: 0 16px 16px 54px; font-size: 13px; }

    /* 预约表单 */
    .booking-form-card { padding: 20px; }
    .form-row-2 { grid-template-columns: 1fr; gap: 0; }
    .form-input { font-size: 14px; padding: 10px 12px; }

    /* 联系 */
    .contact-list { gap: 14px; }
    .ci { width: 32px; height: 32px; flex-basis: 32px; font-size: 16px; }
    .contact-map iframe { height: 320px; }
    .contact-cards { flex-wrap: nowrap !important; gap: 10px; }
    .contact-cards > .contact-card { flex: 1 1 0 !important; min-width: 0 !important; padding: 20px 12px; }
    .contact-card h3 { font-size: 15px; }
    .cc-desc { font-size: 11px; }
    .cc-value { font-size: 14px; }
    .cc-icon { width: 44px; height: 44px; }
    .cc-icon svg { width: 20px; height: 20px; }

    /* 页面 banner */
    .page-banner { padding: 40px 0; }
    .page-banner-title { font-size: 24px; }
    .page-banner-sub { font-size: 13px; }

    /* CTA */
    .cta-title { font-size: 22px; }
    .cta-desc { font-size: 13px; }
    .cta-right { flex-direction: column; width: 100%; }
    .cta-right .btn { width: 100%; }

    /* 底部 */
    .site-footer { padding-top: 36px; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; padding-bottom: 24px; }
    .footer-title { font-size: 18px; }
    .footer-desc { font-size: 12px; }

    /* 悬浮栏 */
    .floating-bar { right: 8px; gap: 6px; }
    .fb-item { width: 48px; height: 48px; }
    .fb-icon { font-size: 18px; }
    .fb-label { font-size: 9px; }

    /* 分页 */
    .pagination li a, .pagination li span { min-width: 34px; height: 34px; line-height: 34px; padding: 0 8px; font-size: 13px; }

    /* 按钮 */
    .btn { padding: 9px 18px; font-size: 14px; }
    .btn-lg { padding: 12px 24px; font-size: 15px; }
}

/* ============ 小屏手机（≤ 480px）============ */
@media (max-width: 480px) {
    .hero-slider { height: 240px; }
    .slide-title { font-size: 18px; }
    .slide-subtitle { font-size: 12px; }
    .slider-arrow { display: none; }

    .section-title { font-size: 20px; }
    .page-banner-title { font-size: 20px; }

    .business-img { aspect-ratio: 16 / 10; }
    .case-img { aspect-ratio: 4 / 3; }

    .case-gallery { grid-template-columns: 1fr; }

    .about-stats { grid-template-columns: repeat(2, 1fr); }
}