/* OceanAds / a two-plane, square-edged navigation signature. */
body.expo-theme dialog.mobile-nav {
    position: fixed; inset: 0; width: 100%; max-width: none; height: 100dvh; max-height: none;
    margin: 0; padding: 0; border: 0; background: transparent !important;
    color: var(--ex-text); opacity: 1; visibility: visible; overflow: hidden;
    transition: none; text-align: left;
}
body.expo-theme dialog.mobile-nav:not([open]) { display: none; }
body.expo-theme dialog.mobile-nav[open] { display: block; }
.mobile-nav::backdrop { background: transparent; }
body.expo-theme dialog.mobile-nav::before {
    content: ''; position: absolute; inset: 0; background: var(--ex-border-strong);
    transform: translateY(-101%); transition: transform 430ms cubic-bezier(.76,0,.24,1) 65ms;
}
.oa-menu-sheet {
    position: absolute; inset: 0; display: flex; flex-direction: column; overflow-y: auto;
    overscroll-behavior: contain; padding: max(22px,env(safe-area-inset-top)) clamp(24px,6vw,80px) max(24px,env(safe-area-inset-bottom));
    background: var(--ex-bg); transform: translateY(-101%);
    transition: transform 440ms cubic-bezier(.76,0,.24,1);
}
body.expo-theme dialog.mobile-nav.is-open::before { transform: translateY(0); transition-delay: 0ms; }
.mobile-nav.is-open .oa-menu-sheet { transform: translateY(0); transition-duration: 620ms; transition-delay: 65ms; }
.oa-menu-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-bottom: 30px; }
.oa-menu-header > span { font-size: 18px; font-weight: 800; letter-spacing: -.04em; }
.oa-menu-header small { display: block; margin-top: 4px; color: var(--ex-text-2); font-size: 10px; font-weight: 400; letter-spacing: .04em; }
.oa-menu-close { position: relative; width: 48px; height: 48px; flex-shrink: 0; padding: 0; border-radius: 9999px; border: 1px solid var(--ex-border-strong); background: var(--ex-surface); color: var(--ex-text); cursor: pointer; }
.oa-menu-close span { position: absolute; left: 13px; top: 23px; width: 20px; height: 1px; background: currentColor; transform: rotate(45deg); }
.oa-menu-close span:last-child { transform: rotate(-45deg); }
.oa-menu-close:hover { background: var(--ex-border); }
.oa-menu-caption { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 14px; font-size: 10px; letter-spacing: .1em; color: var(--ex-text-2); }
body.expo-theme dialog.mobile-nav ul { counter-reset: nav-item; display: grid; grid-template-columns: 1fr; gap: 0; margin: 0; padding: 0; width: 100%; text-align: left; list-style: none; }
body.expo-theme dialog.mobile-nav li { margin: 0; border-top: 1px solid var(--ex-border); opacity: 0; transform: translateY(28px); transition: opacity 180ms, transform 260ms cubic-bezier(.22,1,.36,1); }
body.expo-theme dialog.mobile-nav.is-open li { opacity: 1; transform: translateY(0); transition-duration: 400ms,560ms; transition-delay: calc(145ms + var(--oa-order,0) * 40ms); }
body.expo-theme dialog.mobile-nav a { display: grid; grid-template-columns: 28px 1fr 20px; column-gap: 8px; align-items: center; min-height: 61px; padding: 9px 0; text-decoration: none; color: var(--ex-text) !important; }
body.expo-theme dialog.mobile-nav li a::before { counter-increment: nav-item; content: '0' counter(nav-item); grid-column: 1; grid-row: 1 / 3; font-size: 10px; color: var(--ex-text-2); }
body.expo-theme dialog.mobile-nav li a::after { content: '↗'; grid-column: 3; grid-row: 1 / 3; font-size: 18px; transition: transform 200ms; }
body.expo-theme dialog.mobile-nav li a:hover::after { transform: translate(2px,-2px); }
body.expo-theme dialog.mobile-nav li a .zh { grid-column: 2; grid-row: 1; font-size: clamp(20px,5.4vw,28px); font-weight: 600; line-height: 1.2; letter-spacing: -.04em; color: var(--ex-text) !important; }
body.expo-theme dialog.mobile-nav li a .en { grid-column: 2; grid-row: 2; font-size: 9px; line-height: 1.4; letter-spacing: .08em; color: var(--ex-text-2) !important; }
body.expo-theme dialog.mobile-nav li a[aria-current='page'] { background: var(--ex-surface); }
body.expo-theme dialog.mobile-nav li a[aria-current='page'] .zh { text-decoration: underline; text-underline-offset: 5px; text-decoration-thickness: 1px; }
.oa-menu-footer { margin-top: auto; padding-top: 26px; display: flex; align-items: center; justify-content: space-between; gap: 14px; font-size: 10px; color: var(--ex-text-2); }
body.expo-theme dialog.mobile-nav .oa-menu-footer a { display: inline-flex; padding: 0; min-height: 44px; font-size: 12px; color: var(--ex-link) !important; }
.oa-menu-close:focus-visible,body.expo-theme dialog.mobile-nav a:focus-visible { outline: 2px solid var(--ex-link); outline-offset: 3px; }
.oa-route-veil { position: fixed; inset: 0; z-index: 2147483000; pointer-events: none; visibility: hidden; contain: layout style; }
.oa-route-veil.is-active { visibility: visible; pointer-events: auto; }
.oa-route-plane { position: absolute; inset: 0; background: var(--ex-border-strong); transform: translateY(101%); }
.oa-route-front { background: var(--ex-bg); }
.oa-route-title { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 22px; color: var(--ex-text); opacity: 0; }
.oa-route-title small { font-size: 11px; letter-spacing: .18em; color: var(--ex-text-2); }
.oa-route-title strong { font-size: clamp(30px,6vw,72px); line-height: 1.2; letter-spacing: -.04em; padding-inline: 24px; text-align: center; }
.oa-route-title::after { content: ''; width: 48px; height: 1px; background: var(--ex-text); }
@media(min-width: 700px) {
 .oa-menu-sheet { padding-inline: max(48px,calc((100vw - 960px)/2)); }
 body.expo-theme dialog.mobile-nav ul { grid-template-columns: 1fr 1fr; column-gap: 48px; }
 body.expo-theme dialog.mobile-nav li a { min-height: 95px; }
 .oa-menu-header { padding-bottom: 48px; }
}
@media(max-height: 720px) and (max-width:699px) {
 .oa-menu-header { padding-bottom: 14px; }
 body.expo-theme dialog.mobile-nav li a { min-height: 53px; padding-block: 6px; }
 body.expo-theme dialog.mobile-nav li a .zh { font-size: 20px; }
 .oa-menu-footer { padding-top: 14px; }
}
@media(prefers-reduced-motion: reduce) {
 .oa-menu-sheet,body.expo-theme dialog.mobile-nav::before,body.expo-theme dialog.mobile-nav li { transition: none !important; }
 .oa-route-veil { display: none !important; }
}

/* Use the same geometry/font before and after the document handoff. */
.oa-route-title { gap: 0; font-family: system-ui, sans-serif; }
.oa-route-title small { position: absolute; top: calc(50% - 62px); line-height: 12px; }
.oa-route-title strong { font-family: system-ui, sans-serif; font-weight: 700; }
.oa-route-title::after { content: none; }

.oa-loading-skip { position: absolute; bottom: max(48px,env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%); padding: 12px 20px; min-height: 44px; border-radius: 9999px; border: 1px solid var(--ex-border-strong); background: var(--ex-surface); color: var(--ex-text); font-size: 13px; cursor: pointer; white-space: nowrap; }
.oa-loading-skip[hidden] { display: none; }
.oa-loading-skip:focus-visible { outline: 2px solid var(--ex-link); outline-offset: 3px; }

.oa-route-veil.is-loading .oa-route-title::after { content: '正在準備頁面…'; position: absolute; top: calc(50% + 74px); width: auto; height: auto; background: none; color: var(--ex-text-2); font-size: 12px; font-weight: 400; letter-spacing: .05em; }