/* 全站通用的响应式基础与移动导航 */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    min-width: 0;
    overflow-x: hidden;
}

img,
video,
iframe {
    max-width: 100%;
}

button,
a,
input {
    -webkit-tap-highlight-color: transparent;
}

header {
    position: relative;
    z-index: 1000;
}

.nav-toggle {
    display: none;
}

nav a[aria-current="page"] {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 0.35em;
}

@media (max-width: 768px) {
    header.nav-ready {
        display: grid !important;
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: 0;
        padding: 12px 16px !important;
        text-align: left !important;
        position: sticky;
        top: 0;
    }

    header.nav-ready .logo {
        min-width: 0;
        margin: 0 !important;
        font-size: 1.2rem;
    }

    .nav-toggle {
        display: inline-grid;
        place-items: center;
        width: 44px;
        height: 44px;
        margin: 0;
        padding: 0;
        border: 1px solid rgba(255, 255, 255, 0.45);
        border-radius: 50%;
        background: rgba(0, 0, 0, 0.16);
        color: #fff;
        cursor: pointer;
    }

    .nav-toggle__icon,
    .nav-toggle__icon::before,
    .nav-toggle__icon::after {
        display: block;
        width: 20px;
        height: 2px;
        border-radius: 2px;
        background: currentColor;
        transition: transform 0.25s ease, opacity 0.25s ease;
    }

    .nav-toggle__icon {
        position: relative;
    }

    .nav-toggle__icon::before,
    .nav-toggle__icon::after {
        content: "";
        position: absolute;
        left: 0;
    }

    .nav-toggle__icon::before {
        transform: translateY(-7px);
    }

    .nav-toggle__icon::after {
        transform: translateY(7px);
    }

    .nav-toggle[aria-expanded="true"] .nav-toggle__icon {
        background: transparent;
    }

    .nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
        transform: rotate(45deg);
    }

    .nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
        transform: rotate(-45deg);
    }

    header.nav-ready nav {
        grid-column: 1 / -1;
        width: 100%;
        max-height: 0;
        margin: 0 !important;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transition: max-height 0.3s ease, opacity 0.2s ease, margin 0.3s ease;
    }

    header.nav-ready nav.is-open {
        max-height: 420px;
        margin-top: 10px !important;
        opacity: 1;
        visibility: visible;
    }

    header.nav-ready nav ul {
        display: flex !important;
        flex-direction: column;
        gap: 0 !important;
        width: 100%;
        margin: 0 !important;
        padding: 6px 0 !important;
        border-top: 1px solid rgba(255, 255, 255, 0.24);
    }

    header.nav-ready nav li {
        display: block !important;
        width: 100%;
        margin: 0 !important;
    }

    header.nav-ready nav a {
        display: flex;
        align-items: center;
        min-height: 44px;
        padding: 8px 4px;
        font-size: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}