/* 应用内更新公告：保持为独立样式，方便后续发布时替换公告内容。 */
:root {
    --update-notice-bg: #f6f6f3;
    --update-notice-surface: #ffffff;
    --update-notice-soft: #efefed;
    --update-notice-text: #151515;
    --update-notice-muted: #747470;
    --update-notice-border: rgba(17, 17, 17, 0.07);
}

body.update-announcement-open { overflow: hidden !important; }

.update-announcement-mask {
    position: fixed;
    inset: 0;
    z-index: 210100;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: max(18px, env(safe-area-inset-top)) 18px max(18px, env(safe-area-inset-bottom));
    background: rgba(21, 21, 21, 0.34);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 220ms ease, visibility 0s linear 220ms;
}

.update-announcement-mask.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 220ms ease;
}

.update-announcement-card {
    width: min(100%, 420px);
    max-height: min(82dvh, 700px);
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    overflow: hidden;
    border: 1px solid var(--update-notice-border);
    border-radius: 28px;
    background: var(--update-notice-surface);
    color: var(--update-notice-text);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.16);
    transform: translateY(8px) scale(0.985);
    transition: transform 220ms ease;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

.update-announcement-mask.is-visible .update-announcement-card { transform: translateY(0) scale(1); }

.update-announcement-scroll {
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    overscroll-behavior: contain;
    touch-action: pan-y;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    padding: 26px 23px 20px;
    scrollbar-width: none;
}

.update-announcement-scroll:focus,
.update-announcement-scroll:focus-visible { outline: none; }
.update-announcement-scroll::-webkit-scrollbar { width: 0; height: 0; }

.update-announcement-kicker {
    margin: 0 0 13px;
    color: var(--update-notice-muted);
    font-size: 10px;
    font-weight: 650;
    letter-spacing: 0.15em;
    line-height: 1.3;
}

.update-announcement-title {
    margin: 0;
    font-size: 25px;
    font-weight: 680;
    letter-spacing: -0.045em;
    line-height: 1.18;
}

.update-announcement-summary {
    margin: 12px 0 0;
    color: #4d4d4a;
    font-size: 14px;
    line-height: 1.7;
}

.update-announcement-divider { height: 1px; margin: 23px 0 6px; background: var(--update-notice-border); }

.update-announcement-section { padding: 17px 0; border-bottom: 1px solid var(--update-notice-border); }
.update-announcement-section:last-child { border-bottom: 0; }

.update-announcement-section-title {
    margin: 0 0 7px;
    font-size: 15px;
    font-weight: 630;
    letter-spacing: -0.015em;
    line-height: 1.45;
}

.update-announcement-section-copy {
    margin: 0;
    color: var(--update-notice-muted);
    font-size: 13px;
    line-height: 1.75;
    white-space: pre-line;
}

.update-announcement-end {
    padding: 18px 0 3px;
    color: #9a9995;
    font-size: 10px;
    letter-spacing: 0.14em;
    line-height: 1.5;
    text-align: center;
}

.update-announcement-footer {
    flex: 0 0 auto;
    padding: 13px 18px max(18px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--update-notice-border);
    background: rgba(255, 255, 255, 0.98);
}

.update-announcement-status {
    min-height: 17px;
    margin: 0 0 9px;
    color: var(--update-notice-muted);
    font-size: 11px;
    line-height: 1.45;
    text-align: center;
}

.update-announcement-actions {
    display: grid;
    gap: 8px;
}

.update-announcement-close {
    width: 100%;
    min-height: 48px;
    border: 0;
    border-radius: 999px;
    background: #151515;
    color: #fff;
    font: inherit;
    font-size: 14px;
    font-weight: 650;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: transform 160ms ease, opacity 160ms ease, background 160ms ease;
}

.update-announcement-close:active:not(:disabled) { transform: scale(0.975); }
.update-announcement-close:disabled { cursor: not-allowed; background: var(--update-notice-soft); color: #aaa9a5; }

.update-announcement-dismiss {
    min-height: 35px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: #747470;
    font: inherit;
    font-size: 12px;
    cursor: pointer;
    transition: color 160ms ease, background 160ms ease;
}

.update-announcement-dismiss:active:not(:disabled) { background: var(--update-notice-soft); color: #151515; }
.update-announcement-dismiss:disabled { cursor: not-allowed; color: #b8b7b2; }

@media (max-width: 480px) {
    .update-announcement-mask { padding: 10px 10px max(10px, env(safe-area-inset-bottom)); }
    .update-announcement-card { max-height: min(84dvh, 720px); border-radius: 25px; }
    .update-announcement-scroll { padding: 24px 20px 17px; }
}

@media (prefers-reduced-motion: reduce) {
    .update-announcement-mask, .update-announcement-card, .update-announcement-close, .update-announcement-dismiss { transition-duration: 0.01ms; }
}