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.left{display:flex;gap:8px}.ai-mini{width:38px;height:38px;border-radius:50%;background:#f5f5f5;display:grid;place-items:center;color:var(--ink-2)}.ai-send{width:40px;height:40px;border-radius:50%;background:#f0f0f0;display:grid;place-items:center}.wave{display:flex;align-items:center;gap:2px;height:50px;margin:30px 0}.wave i{width:2px;background:#8a8a8a;border-radius:2px;animation:wv 1.1s ease-in-out infinite}@keyframes wv{0%,to{height:6px}50%{height:36px}}.voice-ctrl{display:flex;gap:16px}.voice-ctrl button{width:52px;height:52px;border-radius:50%;background:#fff;display:grid;place-items:center;box-shadow:var(--shadow-sm);color:var(--ink-2)}.voice-ctrl .mic-on{background:var(--primary)}.notes-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.flashcard{perspective:1000px;height:150px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flash-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:16px;background:#fff;box-shadow:var(--shadow-sm);padding:20px;display:flex;flex-direction:column;justify-content:space-between}.flash-face.front.hi{background:var(--card-pale)}.flash-face.back{transform:rotateY(180deg);background:var(--primary-soft)}.flash-face .q{font-size:16px;font-weight:700}.flash-flip{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--muted)}.note-card{background:#fff;border-radius:16px;box-shadow:var(--shadow-sm);padding:18px;display:flex;flex-direction:column;gap:14px}.note-card.pale{background:var(--card-pale)}.note-card .body{font-size:13.5px;color:var(--ink-2);line-height:1.55}.note-card .foot{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted)}.post-grid{columns:4;column-gap:16px}.post-card{break-inside:avoid;background:#fff;border-radius:16px;box-shadow:var(--shadow-sm);padding:18px;margin-bottom:16px;display:flex;flex-direction:column;gap:12px}.post-card:nth-child(3n){background:var(--card-pale)}.post-head{display:flex;align-items:center;gap:10px}.post-head img{width:38px;height:38px;border-radius:50%}.post-head .n{font-size:14px;font-weight:700}.post-head .r{font-size:12px;color:var(--muted)}.post-card .body{font-size:13.5px;color:var(--ink-2);line-height:1.55}.live-main{background:#111;border-radius:18px;overflow:hidden;position:relative;aspect-ratio:16/9}.live-main img{width:100%;height:100%;object-fit:cover}.live-layout{display:grid;grid-template-columns:1fr 220px;gap:16px}.live-thumbs{display:flex;flex-direction:column;gap:12px}.live-thumb{border-radius:14px;overflow:hidden;aspect-ratio:4/3;background:#222}.live-thumb img{width:100%;height:100%;object-fit:cover}.live-controls{position:absolute;bottom:18px;left:50%;transform:translate(-50%);display:flex;gap:12px}.live-controls button{width:50px;height:50px;border-radius:50%;background:#ffffffeb;display:grid;place-items:center;color:#1b1b1b}.live-controls button.end{background:var(--error);color:#fff}.nf-wrap{text-align:center;padding:40px 20px}.nf-big{font-size:150px;font-weight:800;color:var(--primary);letter-spacing:.05em;line-height:1}.nf-emoji{font-size:90px}@media (max-width: 1100px){.course-grid,.notes-grid,.ai-cards{grid-template-columns:repeat(2,1fr)}.post-grid{columns:2}.dash-grid{grid-template-columns:1fr}.topnav-links{display:none}}@media (max-width: 680px){.course-grid,.notes-grid,.ai-cards{grid-template-columns:1fr}.post-grid{columns:1}.settings-panel,.settings-wrap{grid-template-columns:1fr}.settings-section{grid-template-columns:1fr;gap:14px}.settings-nav{flex-direction:row;overflow-x:auto;border-right:none;border-bottom:1px solid var(--line)}.settings-nav button{white-space:nowrap}.live-layout{grid-template-columns:1fr}.live-thumbs{flex-direction:row;overflow-x:auto}}