/* ============================================
   铭赞网络 - 微信公众号开发运营营销网站
   响应式样式表 responsive.css
   断点：1200 / 992 / 768 / 576
   ============================================ */

/* === 大屏 < 1200 === */
@media (max-width: 1200px) {
    :root {
        --container: 100%;
    }
    .container {
        padding: 0 32px;
    }
    .hero-title { font-size: 48px; }
    .services-grid,
    .extras-grid,
    .solutions-grid { gap: 20px; }
    .footer-inner {
        grid-template-columns: 1.2fr 1fr 2.5fr;
        gap: 40px;
    }
    .footer-business { grid-template-columns: repeat(3, 1fr); }
    .process-list { gap: 12px; }
    .process-step { padding: 28px 16px; }
    .contact-grid { grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .contact-card { padding: 24px 14px; }
}

/* === 桌面 < 992 === */
@media (max-width: 992px) {
    .topbar { display: none; }

    .nav-inner { height: 64px; }
    .brand-tagline { display: none; }
    .brand-name { font-size: 20px; }
    .brand-divider { display: none; }

    .nav-list {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        gap: 4px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transform: translateX(100%);
        transition: transform 0.3s var(--ease);
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }
    .nav-list.open { transform: translateX(0); }
    .nav-list a {
        padding: 14px 16px;
        border-radius: var(--radius-sm);
        font-size: 15px;
    }
    .nav-list a:hover { background: var(--color-bg-alt); }
    .nav-list a::after { display: none; }
    .nav-toggle { display: flex; }

    .hero { padding: 60px 0 80px; min-height: auto; }
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero-visual { display: none; }
    .hero-title { font-size: 38px; }
    .title-line-sub { font-size: 0.5em; }
    .hero-sub { font-size: 15.5px; }
    .hero-trust {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .section { padding: 70px 0; }
    .section-title { font-size: 30px; }
    .section-head { margin-bottom: 48px; }

    .services-grid { grid-template-columns: 1fr; }
    .extras-grid { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }

    .advantage-wrap { grid-template-columns: 1fr; gap: 40px; }
    .advantage-stats { position: static; }

    .process-list { grid-template-columns: repeat(3, 1fr); }
    .process-step::after { display: none; }

    .contact-grid { grid-template-columns: repeat(3, 1fr); }
    .contact-card:nth-child(n+4) { grid-column: span 1; }
    .contact-card:last-child {
        grid-column: 1 / -1;
        max-width: 320px;
        margin: 0 auto;
        width: 100%;
    }

    .qr-card {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 24px;
        padding: 30px 24px;
    }
    .qr-img { margin: 0 auto; }

    .footer-inner { grid-template-columns: 1fr 1fr; gap: 36px; }
    .footer-wide { grid-column: 1 / -1; }
    .footer-business { grid-template-columns: repeat(4, 1fr); }
}

/* === 平板 < 768 === */
@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .hero { padding: 50px 0 60px; }
    .hero-title { font-size: 32px; line-height: 1.25; }
    .hero-eyebrow { font-size: 12px; margin-bottom: 22px; }
    .hero-sub { font-size: 15px; margin-bottom: 28px; }
    .hero-cta { flex-direction: column; }
    .hero-cta .btn { width: 100%; justify-content: center; }
    .hero-trust {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
        padding-top: 28px;
    }
    .hero-trust strong { font-size: 26px; }
    .hero-scroll { display: none; }

    .section { padding: 56px 0; }
    .section-title { font-size: 26px; }
    .section-lead { font-size: 15px; }
    .section-head { margin-bottom: 36px; }

    .services-grid { gap: 16px; }
    .service-card { padding: 30px 24px; }
    .service-title { font-size: 20px; }

    .extras-grid { grid-template-columns: 1fr; }
    .extra-card { padding: 24px 22px; }

    .advantage-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .stat-card { padding: 24px 18px; }
    .stat-num { font-size: 36px; }

    .timeline li { padding-bottom: 28px; }
    .time-year { font-size: 20px; }

    .process-list { grid-template-columns: repeat(2, 1fr); }
    .process-step { padding: 24px 16px; }

    .solutions-grid { grid-template-columns: 1fr; }
    .solution-card { padding: 28px 24px; }

    .faq-item summary { padding: 18px 20px; font-size: 15px; }
    .faq-a { padding: 0 20px 20px; font-size: 14px; }

    .contact-grid { grid-template-columns: 1fr; gap: 12px; }
    .contact-card { padding: 22px 18px; }
    .contact-card:last-child { max-width: none; }

    .qr-card { padding: 24px 20px; }
    .qr-img img { width: 160px; height: 160px; }
    .qr-text h3 { font-size: 20px; }

    .footer { padding-top: 60px; }
    .site-footer { padding-top: 60px; }
    .footer-inner { grid-template-columns: 1fr; gap: 30px; }
    .footer-wide { grid-column: auto; }
    .footer-business { grid-template-columns: repeat(2, 1fr); }
    .footer-bottom-inner { flex-direction: column; text-align: center; }
}

/* === 手机 < 576 === */
@media (max-width: 576px) {
    .container { padding: 0 16px; }
    .brand-name { font-size: 18px; }
    .reg-mark { font-size: 10px; }

    .hero { padding: 40px 0 50px; }
    .hero-title { font-size: 26px; }
    .title-line-sub { font-size: 0.5em; letter-spacing: 0.1em; }
    .hero-sub { font-size: 14px; line-height: 1.75; }
    .hero-sub br { display: none; }
    .btn { padding: 12px 20px; font-size: 14px; }

    .hero-trust { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .hero-trust strong { font-size: 24px; }
    .hero-trust span { font-size: 12px; }

    .section { padding: 48px 0; }
    .section-title { font-size: 22px; }
    .section-eyebrow { font-size: 12px; margin-bottom: 12px; }
    .section-eyebrow::before, .section-eyebrow::after { width: 20px; margin: 0 8px; }
    .section-lead { font-size: 14px; }

    .service-card { padding: 26px 20px; }
    .service-num { font-size: 30px; margin-bottom: 14px; }
    .service-title { font-size: 18px; }
    .service-desc { font-size: 13.5px; }

    .extra-card { padding: 22px 18px; }
    .extra-card h3 { font-size: 16px; }
    .extra-icon { width: 48px; height: 48px; font-size: 28px; }

    .advantage-stats { grid-template-columns: 1fr 1fr; }
    .stat-num { font-size: 32px; }
    .stat-label { font-size: 14px; }

    .process-list { grid-template-columns: 1fr; }
    .process-step { padding: 24px 20px; }

    .solution-card { padding: 24px 20px; }
    .solution-card h3 { font-size: 18px; }

    .faq-item summary { padding: 16px 18px; font-size: 14.5px; }
    .faq-a { padding: 0 18px 18px; }

    .qr-img img { width: 140px; height: 140px; }
    .qr-text h3 { font-size: 18px; }

    .footer-business { grid-template-columns: repeat(2, 1fr); gap: 6px 12px; }
    .footer-business a { font-size: 12.5px; }
    .footer-bottom-inner { font-size: 12px; }
}