/* 平板设备 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .process-steps {
        flex-direction: column;
    }

    .process-arrow {
        transform: rotate(90deg);
    }

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

    .inspection-options {
        grid-template-columns: 1fr;
    }

    .services-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 60px 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .services {
        padding: 60px 0;
    }

    .process {
        padding: 60px 0;
    }

    .contact-methods {
        padding: 60px 0;
    }

    .quick-contact {
        padding: 60px 0;
    }

    .contact-form {
        padding: 25px;
    }

    .agreement-content {
        padding: 60px 0;
    }

    .agreement-section {
        padding: 25px;
    }

    .agreement-header {
        padding: 30px 20px;
    }

    .agreement-footer {
        padding: 25px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .process-item {
        flex-direction: column;
        text-align: center;
    }

    .requirement-item {
        flex-direction: column;
        text-align: center;
    }

    .qr-code {
        width: 120px;
        height: 120px;
    }

    .contact-id {
        font-size: 0.9rem;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .nav-avatar {
        width: 35px;
        height: 35px;
    }
}

/* 超大屏幕 */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }

    .hero-content {
        max-width: 1400px;
    }

    .nav-container {
        max-width: 1400px;
    }
}

/* 折叠面板 */
.collapse-header {
    background: var(--light-color);
    padding: 15px 20px;
    border-radius: 5px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    transition: var(--transition);
}

.collapse-header:hover {
    background: #e9ecef;
}

.collapse-header h4 {
    margin: 0;
    color: var(--dark-color);
}

.collapse-icon {
    transition: var(--transition);
}

.collapse-header.active .collapse-icon {
    transform: rotate(180deg);
}

.collapse-content {
    padding: 20px;
    background: white;
    border-radius: 5px;
    margin-bottom: 15px;
    display: none;
}

.collapse-content.active {
    display: block;
}