/* 
* Responsive Styles for Only Truth Travel Agency
* Breakpoints:
* - Large: 1200px
* - Medium: 992px
* - Small: 768px
* - Extra Small: 576px
*/

/* Large Devices (Desktops, less than 1200px) */
@media (max-width: 1199.98px) {
    html {
        font-size: 60%;
    }

    .routes-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

/* Medium Devices (Tablets, less than 992px) */
@media (max-width: 991.98px) {
    html {
        font-size: 58%;
    }

    .header-container {
        padding: 1.5rem;
    }

    .main-nav {
        gap: 2rem;
    }

    .hero h1 {
        font-size: 4.8rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 4rem;
    }

    .contact-info {
        padding-right: 0;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }

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

/* Small Devices (Landscape Phones, less than 768px) */
@media (max-width: 767.98px) {
    html {
        font-size: 56%;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        left: -100%;
        width: 80%;
        height: 100vh;
        background-color: var(--navy-blue);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 3rem;
        transition: var(--transition-standard);
        z-index: 99;
    }

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

    .main-nav a {
        font-size: 2rem;
    }

    .hero h1 {
        font-size: 4rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1.5rem;
    }

    .cta-button {
        width: 100%;
    }

    .section-title {
        font-size: 3rem;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .testimonial-content {
        padding: 3rem 2rem;
    }

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

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

    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

/* Extra Small Devices (Portrait Phones, less than 576px) */
@media (max-width: 575.98px) {
    html {
        font-size: 54%;
    }

    .hero h1 {
        font-size: 3.6rem;
    }

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

    .testimonial-content p {
        font-size: 1.6rem;
    }

    .contact-form-container {
        padding: 3rem 2rem;
    }

    .social-links {
        justify-content: center;
    }
}

/* Mobile Menu Overlay */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 98;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-standard);
}

.menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Menu Close Button */
.mobile-menu-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    color: var(--off-white);
    font-size: 2.4rem;
    cursor: pointer;
    display: none; /* 默认隐藏 */
}

/* 只在移动菜单激活时显示关闭按钮 */
.main-nav.active .mobile-menu-close {
    display: block;
}

/* Header Scroll Styles */
@media (min-width: 768px) {
    header.scrolled {
        padding: 1rem 0;
        background-color: rgba(var(--navy-blue-rgb), 0.95);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
}