.announcement-content { line-height: 1.8; overflow-wrap: anywhere; text-align: start; }
.announcement-content p, .announcement-content div { margin-block: .65em; }
.announcement-content h2, .announcement-content h3 { margin-block: 1em .4em; line-height: 1.4; }
.announcement-content ul, .announcement-content ol { padding-inline-start: 1.5em; }
.announcement-content img { display: block; max-width: 100%; height: auto; border-radius: 12px; margin-block: 12px; }
.announcement-content a { color: var(--primary, #315fdb); text-decoration: underline; }
.announcement-content blockquote { margin-inline: 0; padding-inline-start: 16px; border-inline-start: 3px solid var(--line, #dbe3ed); }
.announcement-meta { color: var(--muted); margin-block: 8px 20px; }
#system-announcement-dialog { width: min(720px, calc(100vw - 24px)); max-height: calc(100dvh - 32px); padding: 24px; overflow-y: auto; border-radius: 24px; }
.announcement-heading { display: flex; align-items: start; justify-content: space-between; gap: 16px; }
.announcement-heading h2 { margin: 0; }
.announcement-heading button { flex-shrink: 0; min-width: 44px; min-height: 44px; }
.announcement-manager { margin-block: 24px; padding: 24px; }
.announcement-layout { display: grid; grid-template-columns: minmax(180px, .65fr) minmax(0, 1.5fr); gap: 24px; margin-block-start: 20px; }
.announcement-list { display: grid; align-content: start; gap: 8px; max-height: 700px; overflow-y: auto; }
.announcement-list button { display: grid; gap: 6px; text-align: start; padding: 12px; background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.announcement-list button[aria-pressed="true"] { border-color: var(--blue); box-shadow: inset 0 0 0 1px var(--blue); }
.announcement-list small { color: var(--muted); }
.announcement-form { display: grid; gap: 12px; min-width: 0; }
.announcement-form label { display: grid; gap: 6px; font-weight: 600; }
.announcement-form input, .announcement-form textarea, .announcement-editor { width: 100%; box-sizing: border-box; font: inherit; padding: 12px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.announcement-editor { min-height: 220px; max-height: 520px; overflow-y: auto; font-weight: 400; }
.announcement-editor[contenteditable="false"] { background: var(--canvas); }
.announcement-toolbar, .announcement-buttons { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.announcement-toolbar button { min-height: 40px; }
.announcement-preview { padding: 20px; background: var(--canvas); border: 1px solid var(--line); border-radius: 16px; }
.announcement-preview[hidden] { display: none; }
.announcement-manager :focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
@media (max-width: 700px) { .announcement-layout { grid-template-columns: minmax(0, 1fr); } .announcement-list { max-height: 200px; } .announcement-manager { padding: 16px; } }

.announcement-form fieldset { display: grid; gap: 14px; min-width: 0; margin: 0; padding: 0; border: 0; }
.announcement-form legend { margin-block-end: 12px; font-weight: 700; }
.announcement-form .field-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.announcement-toolbar input[type="file"] { max-width: 230px; font-size: 12px; }
@media (max-width: 450px) { .announcement-form .field-row { grid-template-columns: minmax(0, 1fr); } }