/* ==========================================================================
   响应式样式 - 桌面优先,平板手机适配
   ========================================================================== */

/* --------------------------------------------------------------------------
   平板 1024px 以下
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .container {
        padding: 0 20px;
    }

    .nav-menu {
        gap: 2px;
    }

    .nav-link {
        padding: 8px 10px;
        font-size: 0.875rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-num {
        font-size: 2.5rem;
    }

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

    .process-list {
        grid-template-columns: 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .about-photo-wrap {
        max-width: 320px;
        margin: 0 auto;
    }

    .about-photo-badge {
        right: 0;
        bottom: 16px;
    }

    .about-text p {
        text-align: left;
    }

    .about-highlights li {
        text-align: left;
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .contact-qr {
        max-width: 320px;
        margin: 0 auto;
    }

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* --------------------------------------------------------------------------
   手机 768px 以下
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --nav-h: 60px;
    }

    .container {
        padding: 0 16px;
    }

    /* 导航变汉堡菜单 */
    .nav-menu {
        position: fixed;
        top: var(--nav-h);
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: #FFFFFF;
        border-top: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.4s ease;
        padding: 0;
    }

    .nav-menu.active {
        max-height: 480px;
        padding: 8px 0;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 14px 20px;
        font-size: 1rem;
        border-radius: 0;
        border-bottom: 1px solid var(--bg-soft);
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .nav-link:hover,
    .nav-link.active {
        background: var(--bg-soft);
    }

    .nav-phone {
        padding: 8px 14px;
        font-size: 0.875rem;
    }

    .nav-phone span {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    /* Hero */
    .hero {
        min-height: 92vh;
        padding: calc(var(--nav-h) + 32px) 0 60px;
    }

    .hero-title {
        font-size: 1.875rem;
    }

    .hero-subtitle {
        font-size: 0.9375rem;
        margin-bottom: 32px;
    }

    .hero-cta {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 40px;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .hero-trust {
        gap: 16px;
        font-size: 0.875rem;
    }

    .hero-trust li {
        font-size: 0.8125rem;
    }

    .hero-scroll {
        display: none;
    }

    /* Section */
    .section {
        padding: 64px 0;
    }

    .section-head {
        margin-bottom: 40px;
    }

    .section-title {
        font-size: 1.625rem;
    }

    .section-subtitle {
        font-size: 0.9375rem;
    }

    /* Stats */
    .stats {
        padding: 40px 0;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-card {
        padding: 24px 12px;
    }

    .stat-num {
        font-size: 2rem;
    }

    .stat-label {
        font-size: 0.8125rem;
    }

    /* Advantages */
    .advantages-grid,
    .services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .advantage-card,
    .service-card {
        padding: 28px 20px;
    }

    /* Process */
    .process-item {
        padding: 20px;
        gap: 16px;
    }

    .process-num {
        width: 44px;
        height: 44px;
        font-size: 1.0625rem;
    }

    /* About */
    .about-photo-wrap {
        max-width: 260px;
    }

    .about-photo-badge {
        padding: 14px 18px;
        right: -12px;
        bottom: 12px;
    }

    .about-photo-badge strong {
        font-size: 1.875rem;
    }

    .about-photo-badge strong small {
        font-size: 0.875rem;
    }

    .about-photo-badge span {
        font-size: 0.75rem;
    }

    .about-highlights li {
        padding: 12px 16px;
        gap: 12px;
    }

    /* Cases */
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* FAQ */
    .faq-q {
        padding: 16px 18px;
        gap: 12px;
    }

    .faq-num {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    .faq-question {
        font-size: 0.9375rem;
    }

    .faq-a {
        padding: 0 18px 18px 62px;
        font-size: 0.875rem;
    }

    /* Contact */
    .contact-item {
        padding: 16px 18px;
        gap: 16px;
    }

    .contact-item-icon {
        width: 40px;
        height: 40px;
    }

    .contact-item-icon i {
        width: 18px;
        height: 18px;
    }

    .contact-item-value {
        font-size: 1.0625rem;
    }

    .qr-card img {
        width: 180px;
        height: 180px;
    }

    /* Links */
    .links-categories {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .link-category {
        padding: 24px 20px;
    }

    /* Footer */
    .footer {
        padding: 48px 0 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        padding-bottom: 32px;
    }

    .footer-brand p {
        max-width: 100%;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }

    /* Floating */
    .floating {
        right: 12px;
        bottom: 60px;
        gap: 8px;
    }

    .floating-item {
        width: 50px;
        height: 50px;
        font-size: 0.625rem;
    }

    .floating-item i {
        width: 18px;
        height: 18px;
    }

    .floating-qr .floating-popup {
        right: 60px;
    }

    .floating-popup img {
        width: 110px;
        height: 110px;
    }
}

/* --------------------------------------------------------------------------
   小屏手机 480px 以下
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
    .container {
        padding: 0 14px;
    }

    .logo {
        font-size: 1.125rem;
    }

    .logo-sub {
        font-size: 0.875rem;
    }

    .nav-phone {
        padding: 6px 10px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.375rem;
    }

    .stat-num {
        font-size: 1.75rem;
    }

    .stat-num em {
        font-size: 1.125rem;
    }

    .advantage-card,
    .service-card {
        padding: 24px 18px;
    }

    .btn {
        padding: 12px 22px;
        font-size: 0.9375rem;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 1rem;
    }

    .floating {
        right: 8px;
        bottom: 50px;
    }

    .floating-item {
        width: 46px;
        height: 46px;
    }
}

/* --------------------------------------------------------------------------
   大屏 1440px 以上
   -------------------------------------------------------------------------- */
@media (min-width: 1440px) {
    :root {
        --max-w: 1360px;
    }

    .section {
        padding: 112px 0;
    }

    .hero-title {
        font-size: 4.5rem;
    }
}