.topics-page.active { display: block; }
.topic-directory { max-width: 1180px; margin: 0 auto; padding: 32px 0 64px; }
.topic-directory-intro p { font-size: 26px; font-weight: 600; line-height: 1.4; letter-spacing: -.5px; }
.topic-directory-intro > span { display: block; margin-top: 10px; color: var(--topic-muted); font-size: 15px; }
.topic-directory { --topic-muted: rgba(var(--ink-rgb), .68); --topic-border: rgba(var(--ink-rgb), .16); }
.topic-directory-controls { display: flex; gap: 24px; justify-content: space-between; align-items: end; margin: 30px 0 0; padding-bottom: 20px; border-bottom: 1px solid var(--topic-border); }
.topic-filters { display: flex; flex-wrap: wrap; gap: 6px; }
.topic-filters button, .topic-empty button { border: 1px solid transparent; border-radius: 6px; background: transparent; color: var(--topic-muted); min-height: 42px; padding: 8px 14px; font: inherit; touch-action: manipulation; }
.topic-filters button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.topic-filters button:hover:not([aria-pressed="true"]), .topic-empty button:hover { background: var(--paper-dim); color: var(--ink); }
.topic-search { display: flex; flex-direction: column; gap: 7px; font-size: 12px; color: var(--topic-muted); width: 280px; max-width: 100%; }
.topic-search input { width: 100%; min-width: 0; min-height: 42px; padding: 10px 12px; border: 1px solid var(--topic-border); border-radius: 6px; background: var(--paper); color: var(--ink); font: 14px/1.5 var(--font-display); }
.topic-search input::placeholder { color: var(--topic-muted); }
.topic-search-status { margin: 12px 0 0; font-size: 12px; color: var(--topic-muted); min-height: 18px; }
.topic-section { margin-top: 32px; }
.topic-section > header { margin-bottom: 18px; }
.topic-section h2 { font-size: 19px; font-weight: 600; line-height: 1.5; }
.topic-section header p { margin-top: 5px; font-size: 13px; color: var(--topic-muted); }
.topic-directory-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
.topic-tile { display: flex; flex-direction: column; min-width: 0; padding: 22px; border: 1px solid var(--topic-border); border-radius: 8px; background: var(--paper); transition: border-color .15s, background-color .15s; }
.topic-tile:hover { background: var(--paper-dim); border-color: rgba(var(--ink-rgb),.4); }
.topic-tile h3 { font-size: 17px; font-weight: 600; line-height: 1.5; overflow-wrap: anywhere; text-wrap: balance; }
.topic-tile p { margin: 9px 0 22px; font-size: 14px; line-height: 1.7; color: var(--topic-muted); overflow-wrap: anywhere; }
.topic-tile-action { display: flex; gap: 10px; align-items: center; margin-top: auto; font-size: 12px; color: var(--topic-muted); }
.topic-tile:hover .topic-tile-action { color: var(--ink); }
.topic-directory :is(a,button,input):focus-visible { outline: 2px solid var(--heat); outline-offset: 4px; }
.topic-directory [hidden] { display: none !important; }
.topic-empty { padding: 54px 16px; text-align: center; color: var(--topic-muted); }
.topic-empty button { margin-top: 15px; border-color: var(--topic-border); color: var(--ink); }
@media (max-width: 1100px) { .topic-directory-grid { grid-template-columns: repeat(2,minmax(0,1fr)); } .topic-directory-controls { align-items: start; flex-direction: column; gap: 16px; } }
@media (max-width: 600px) { .topic-directory { padding-top: 20px; } .topic-directory-intro p { font-size: 23px; } .topic-directory-grid { grid-template-columns: minmax(0,1fr); gap: 10px; } .topic-search { width: 100%; } .topic-directory-controls { gap: 18px; } .topic-filters { gap: 3px; } .topic-filters button { padding: 8px 10px; } .topic-tile { padding: 20px; } .topic-tile p { margin-bottom: 15px; } }
@media (prefers-reduced-motion: reduce) { .topic-tile { transition: none; } }