@media (max-width: 480px) {
    .submit-modal {
        max-width: 100%;
        border-radius: 12px;
    }
    .submit-modal__header {
        padding: 18px 20px 14px;
    }
    .submit-modal__body {
        padding: 16px 20px;
    }
    .submit-modal__footer {
        padding: 12px 20px 20px;
    }
    .submit-info-label {
        width: 64px;
        font-size: 0.78rem;
    }
    .submit-info-value {
        font-size: 0.85rem;
    }
    .submit-info-row {
        padding: 10px 14px;
    }
}

@media (max-width: 480px) {
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }

    .content-image {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .content-image--reverse .content-text {
        order: 0;
    }

    .contact-wrap {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .section { padding: 7px 10px; }

    /* ===== 移动端菜单遮罩层 ===== */
    .nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.45);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.35s ease, visibility 0.35s ease;
    }
    .nav-overlay.show {
        opacity: 1;
        visibility: visible;
    }

    /* ===== 侧边导航面板 ===== */
    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        width: 78%;
        max-width: 320px;
        height: 100vh;
        height: 100dvh;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 0;
        gap: 0;
        transform: translateX(100%);
        transition: transform 0.38s cubic-bezier(0.22, 0.61, 0.36, 1);
        overflow-y: auto;
        z-index: 999;
        box-shadow: -4px 0 32px rgba(0, 0, 0, 0.10);
        border-radius: 16px 0 0 16px;
    }

    .nav-links.open {
        transform: translateX(0);
    }

    /* ---- 面板顶部品牌区 ---- */
    .nav-links::before {
        content: '';
        display: block;
        min-height: 18px;
        flex-shrink: 0;
        background: linear-gradient(135deg, #0066ff, #0088ff);
        border-radius: 16px 0 0 0;
    }

    /* ---- 菜单项容器 ---- */
    .nav-links > li {
        opacity: 0;
        transform: translateX(30px);
        transition: all 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
        border-bottom: 1px solid #f0f3f8;
    }
    .nav-links > li:last-of-type {
        border-bottom: none;
    }
    .nav-links.open > li {
        opacity: 1;
        transform: translateX(0);
    }
    .nav-links.open > li:nth-child(1) { transition-delay: 0.06s; }
    .nav-links.open > li:nth-child(2) { transition-delay: 0.12s; }
    .nav-links.open > li:nth-child(3) { transition-delay: 0.18s; }
    .nav-links.open > li:nth-child(4) { transition-delay: 0.24s; }
    .nav-links.open > li:nth-child(5) { transition-delay: 0.30s; }

    /* ---- 菜单链接 ---- */
    .nav-links a {
        display: flex;
        align-items: center;
        padding: 16px 28px;
        font-size: 1.05rem;
        font-weight: 500;
        color: #1a2a4a;
        border-bottom: none;
        position: relative;
        transition: all 0.25s ease;
    }

    /* ---- 左侧装饰条 ---- */
    .nav-links a::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%);
        width: 0;
        height: 24px;
        background: linear-gradient(180deg, #0066ff, #0088ff);
        border-radius: 0 3px 3px 0;
        transition: width 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
        color: #0066ff;
        background: rgba(0, 102, 255, 0.04);
    }

    .nav-links a:hover::before,
    .nav-links a.active::before {
        width: 3px;
    }

    .nav-links a.active span::after {
        display: none;
    }

    /* ---- 下拉菜单（手风琴） ---- */
    .nav-dropdown > a {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .nav-dropdown > a .drop-arrow {
        transition: transform 0.3s ease;
        font-size: 0.55rem;
        opacity: 0.4;
    }

    .nav-dropdown.open > a .drop-arrow {
        transform: rotate(180deg);
        opacity: 0.7;
    }

    .drop-menu {
        position: static;
        background: #f8fafd;
        box-shadow: none;
        border-radius: 0;
        opacity: 1;
        visibility: visible;
        transform: none;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }

    .nav-dropdown.open .drop-menu {
        max-height: 300px;
    }

    .drop-menu li a {
        padding: 13px 28px 13px 52px;
        font-size: 0.93rem;
        color: #5a6a80;
        font-weight: 400;
        border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    }

    .drop-menu li:last-child a {
        border-bottom: none;
    }

    .drop-menu li a:hover {
        color: #0066ff;
        background: rgba(0, 102, 255, 0.03);
    }

    /* ---- CTA 按钮 ---- */
    .nav-cta {
        margin: 20px 24px 0;
        flex-shrink: 0;
    }

    .nav-cta .btn {
        width: 100%;
        padding: 13px 0;
        font-size: 0.98rem;
        border-radius: 10px;
        text-align: center;
        font-weight: 600;
    }

    /* ---- 汉堡按钮 ---- */
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .hero h1 { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1rem; }
    .section-header h2 { font-size: 2rem !important; }
    .cta-section h2 { font-size: 1.2rem; }
    .page-hero h1 { font-size: 2rem; }
    .page-hero { padding: calc(var(--header-height) + 50px) 0 50px; }

    .grid--2,
    .grid--3,
    .grid--4 {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer {
        padding: 50px 0 0;
    }

    .footer-brand p {
        font-size: .85rem;
    }

    .footer-col h5 {
        margin-bottom: 16px;
    }

    /* 手机端隐藏快速导航和服务领域 */
    .footer-col--nav,
    .footer-col--services {
        display: none;
    }

    .footer-bottom {
        padding: 20px 0;
        font-size: .78rem;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding: 0 0 40px 50px;
    }

    .timeline-item:nth-child(even) {
        margin-left: 0;
        padding: 0 0 40px 50px;
    }

    .timeline-item .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        left: 12px;
        right: auto;
    }

    .contact-form,
    .contact-info-card {
        padding: 32px 24px;
    }

    .stat-item .stat-number { font-size: 2.2rem; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.8rem; }
    .section-header h2 { font-size: 1.2rem; }
    .cta-section h2 { font-size: 1.2rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }

    .footer {
        padding: 4px 10px;
		margin-top: 30px;
    }

    .footer-grid {
        gap: 24px;
        margin-bottom: 32px;
    }

    .footer-brand .nav-logo img {
        max-width: 140px;
    }

    .footer-brand p {
        font-size: .8rem;
        line-height: 1.7;
    }

    .footer-col h5 {
        font-size: .92rem;
        margin-bottom: 12px;
    }

    .footer-col ul li {
        margin-bottom: 10px;
    }

    .footer-col ul li a {
        font-size: .82rem;
    }

    .footer-contact li {
        font-size: .8rem;
        gap: 8px;
    }

    .footer-bottom {
        padding: 16px 0;
        font-size: .72rem;
    }
}
/* ===== submit modal QR code (mobile) ===== */
@media (max-width: 480px) {
    .submit-modal__qr {
        padding: 14px 12px;
        margin-bottom: 14px;
    }
    .submit-modal__qr img {
        width: 150px;
        height: 150px;
    }
    .submit-modal__qr-hint {
        font-size: 0.8rem;
    }
}
@media (max-width: 480px) {
    .submit-modal__details > summary {
        padding: 9px;
        font-size: 0.8rem;
    }
}