/* Virtual classroom — full-viewport room: stage + bottom bar, right rail. */
.cr {
  --cr-bezel: #143642;
  --cr-surface: rgba(255, 255, 255, 0.045);
  --cr-rail: #0a1f2a;
  --cr-stage: #151514;
  --cr-rail-w: 380px;
  height: 100vh; height: 100dvh;
  display: grid; grid-template-rows: 68px minmax(0, 1fr);
  background: var(--bg); color: var(--ink);
  overflow: hidden;
}
[data-theme="light"] .cr { --cr-bezel: #a29e96; --cr-surface: #f8f7f3; --cr-rail: #f8f7f3; }
.cr button { font: inherit; color: inherit; cursor: pointer; }
.cr button:disabled { cursor: default; opacity: .4; }
.cr :focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* top bar */
.cr-top { display: flex; align-items: center; gap: 26px; padding: 0 16px 0 14px; min-width: 0; }
.cr-brand { display: grid; place-items: center; padding: 0; border: 0; background: none; }
.cr-brand img { width: 34px; height: 34px; object-fit: contain; }
.cr-tabs { display: flex; gap: 26px; min-width: 0; }
.cr-tabs button { padding: 6px 0; border: 0; background: none; color: var(--muted); font: 500 18px var(--font-display); letter-spacing: -.01em; }
.cr-tabs button.active, .cr-tabs button:hover { color: var(--ink-strong); }
.cr-top-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.cr-me { width: 36px; height: 36px; }

/* buttons */
.cr-pill { display: inline-flex; align-items: center; gap: 8px; height: 44px; padding: 0 22px; border: 0; border-radius: 999px; background: var(--ink-strong); color: var(--bg) !important; font: 600 15px var(--font-display) !important; white-space: nowrap; transition: transform .15s; }
.cr-pill:hover { transform: translateY(-1px); }
.cr-pill.light { background: #fff; color: #151514 !important; }
.cr-pill.ghost { background: transparent; color: #fff !important; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .35); }
.cr-pill.danger { background: var(--coral); color: #fff !important; }
.cr-bar .cr-pill { height: 38px; padding: 0 18px; font-size: 14px !important; }
.cr-icon-btn { display: grid; place-items: center; width: 38px; height: 38px; padding: 0; border: 0; border-radius: 10px; background: transparent; }
.cr-sheet-btn { background: var(--ink-strong); color: var(--bg) !important; }
.cr-text-btn { padding: 4px 6px; border: 0; background: none; color: var(--muted) !important; font-size: 12px !important; text-decoration: underline; text-underline-offset: 3px; }
.cr-bar-btn { min-width: 38px; height: 38px; padding: 0 12px; border: 1px solid var(--line-strong); border-radius: 10px; background: transparent; font-size: 14px !important; }
.cr-bar-btn:hover:not(:disabled), .cr-bar-btn.on { background: var(--surface-hover); }
.cr-seg { display: inline-flex; padding: 3px; border: 1px solid var(--line-strong); border-radius: 10px; }
.cr-seg button { height: 30px; padding: 0 12px; border: 0; border-radius: 7px; background: none; color: var(--muted); font-size: 13px; }
.cr-seg button.active { background: var(--ink-strong); color: var(--bg); }

/* body */
.cr-body { display: grid; grid-template-columns: minmax(0, 1fr) var(--cr-rail-w); min-height: 0; transition: grid-template-columns .25s ease; }
.cr.sheet-open .cr-body { grid-template-columns: minmax(0, 1fr) 0; }
.cr-main { display: grid; grid-template-rows: minmax(0, 1fr) auto; gap: 16px; min-width: 0; min-height: 0; padding: 4px 10px 10px; }
.cr-view { display: flex; min-height: 0; }

/* stage */
.cr-frame { flex: 1; display: flex; min-width: 0; padding: 26px; border-radius: 30px; background: var(--cr-bezel); transition: box-shadow .3s; }
.cr-frame.is-live { box-shadow: 0 0 0 2px color-mix(in srgb, var(--coral) 55%, transparent); }
.cr-stage { position: relative; flex: 1; display: grid; place-items: center; min-width: 0; overflow: hidden; border-radius: 18px; background: var(--cr-stage); color: #f3f1ea; container-type: size; }
.cr-card { display: grid; justify-items: center; gap: 4px; max-width: 86%; text-align: center; }
.cr-card h1 { margin: 0 0 22px; color: #fff; font: 600 clamp(22px, 3.1cqw, 46px)/1.15 var(--font-display); letter-spacing: -.02em; text-wrap: balance; }
.cr-meta { margin: 0 0 22px; font: 500 clamp(13px, 1.35cqw, 19px) var(--font-display); letter-spacing: .02em; opacity: .92; }
.cr-sub { margin: 0; font: 500 clamp(14px, 1.45cqw, 20px) var(--font-display); font-variant-numeric: tabular-nums; opacity: .92; }
.cr-card-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 28px; }
.cr-slide { align-self: stretch; justify-self: stretch; display: flex; flex-direction: column; justify-content: center; gap: 2cqh; padding: 7cqh 7cqw; background: radial-gradient(circle at 85% 15%, rgba(185, 165, 255, .16), transparent 32%); }
.cr-slide-kicker { color: var(--gold); font: 600 clamp(11px, 1.1cqw, 15px) var(--font-display); letter-spacing: .14em; text-transform: uppercase; }
.cr-slide h2 { max-width: 22ch; margin: 0; color: #fff; font: 600 clamp(26px, 5cqw, 72px)/1.02 var(--font-display); letter-spacing: -.03em; text-wrap: balance; }
.cr-slide p { max-width: 60ch; margin: 0; color: #d6d3cb; font-size: clamp(14px, 1.6cqw, 21px); line-height: 1.5; }
.cr-slide-count { position: absolute; right: 4cqw; bottom: 4cqh; color: #a9a59c; font: 500 clamp(12px, 1.2cqw, 16px) var(--font-display); font-variant-numeric: tabular-nums; }
.cr-embed { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: #000; }
.cr-ribbon { position: absolute; top: 14px; left: 50%; translate: -50% 0; padding: 7px 14px; border: 0; border-radius: 999px; background: rgba(0, 0, 0, .7); color: #fff; font-size: 12px; white-space: nowrap; }

/* reactions float up over the stage */
.cr-float { position: fixed; left: 0; bottom: 96px; width: calc(100% - var(--cr-rail-w)); height: 60vh; pointer-events: none; z-index: 5; }
.cr.sheet-open .cr-float { width: 100%; }
.cr-float span { position: absolute; bottom: 0; font-size: 32px; animation: cr-rise 2.8s cubic-bezier(.2, .7, .3, 1) forwards; }
@keyframes cr-rise { 0% { opacity: 0; transform: translate(0, 0) scale(.6); } 12% { opacity: 1; transform: translate(0, -20px) scale(1.1); } 100% { opacity: 0; transform: translate(var(--drift), -52vh) scale(1); } }

/* bottom bar */
.cr-bar { display: flex; align-items: center; gap: 22px; min-height: 76px; padding: 10px 14px 10px 26px; border-radius: 14px; background: var(--cr-surface); }
.cr-bar-status { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; color: var(--ink); font-size: 14px; font-variant-numeric: tabular-nums; }
.cr-bar-status.live { color: var(--coral); font-weight: 600; }
.cr-bar-status svg { margin-right: 6px; }
.cr-bar-title { min-width: 0; overflow: hidden; color: var(--ink-strong); font: 700 17px var(--font-display); letter-spacing: -.02em; text-overflow: ellipsis; white-space: nowrap; }
.cr-bar-controls { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.cr-reacts { display: flex; gap: 2px; }
.cr-reacts button { width: 36px; height: 36px; padding: 0; border: 0; border-radius: 10px; background: none; font-size: 19px; transition: transform .12s; }
.cr-reacts button:hover { transform: scale(1.2); background: var(--surface-hover); }
.cr-reacts button:active { transform: scale(.9); }
.cr-settings-btn { display: grid; justify-items: center; gap: 3px; min-width: 64px; padding: 6px; border: 0; background: none; font-size: 12px !important; }
.cr-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--coral); animation: cr-pulse 1.6s ease-in-out infinite; }
@keyframes cr-pulse { 50% { box-shadow: 0 0 0 5px color-mix(in srgb, var(--coral) 25%, transparent); } }

/* speakers + agenda views */
.cr-panel-view { flex: 1; min-width: 0; overflow: auto; padding: clamp(20px, 3vw, 40px); border-radius: 30px; background: var(--cr-surface); }
.cr-speakers { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }
.cr-speaker { display: grid; justify-items: center; gap: 6px; padding: 24px 14px; border: 1px solid var(--line); border-radius: 18px; text-align: center; }
.cr-speaker strong { margin-top: 8px; color: var(--ink-strong); font: 600 16px var(--font-display); }
.cr-speaker span { color: var(--muted); font-size: 13px; }
.cr-empty { color: var(--muted); }
.cr-agenda { margin: 0; padding: 0; list-style: none; }
.cr-agenda-row { display: grid; grid-template-columns: 88px minmax(0, 1fr) auto; align-items: center; gap: 16px; width: 100%; padding: 18px 16px; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: none; text-align: left; }
button.cr-agenda-row:hover, .cr-agenda-row.active { background: var(--surface-hover); border-radius: 12px; }
.cr-agenda-time { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.cr-agenda-row strong { display: block; color: var(--ink-strong); font: 600 16px var(--font-display); }
.cr-agenda-row small { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.cr-agenda-row em, .cr-chat em, .cr-people em { padding: 3px 9px; border-radius: 999px; background: color-mix(in srgb, var(--coral) 16%, transparent); color: var(--coral); font: 600 11px var(--font-body); font-style: normal; }

/* forms */
.cr input, .cr select, .cr textarea { width: 100%; min-height: 42px; padding: 9px 12px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--surface-input, rgba(255, 255, 255, .05)); color: var(--ink-strong); font: 14px var(--font-body); }
.cr-inline-form { display: flex; flex-wrap: wrap; gap: 10px; max-width: 640px; margin-top: 26px; }
.cr-inline-form input { flex: 1 1 180px; width: auto; }

/* rail */
.cr-rail { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; min-width: 0; min-height: 0; overflow: hidden; padding: 0 26px; border-top-left-radius: 18px; background: var(--cr-rail); }
.cr-rail-tabs { display: flex; align-items: center; gap: 24px; padding-top: 26px; }
.cr-rail-tabs > button:not(.cr-icon-btn) { position: relative; padding: 4px 0 10px; border: 0; background: none; color: var(--muted); font: 500 16px var(--font-display); white-space: nowrap; }
.cr-rail-tabs > button.active { color: var(--ink-strong); }
.cr-rail-tabs > button.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; border-radius: 2px; background: var(--ink-strong); }
.cr-rail-tabs b { margin-left: 3px; color: var(--muted); font-weight: 500; font-size: 13px; }
.cr-sheet-close { display: none !important; margin-left: auto; font-size: 22px !important; }
.cr-rail-list { overflow-y: auto; padding: 16px 0; overscroll-behavior: contain; }
.cr-empty-rail { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; height: 100%; color: var(--muted); font-size: 14px; text-align: center; }
.cr-empty-rail svg { margin-bottom: 8px; color: var(--ink); }
.cr-empty-rail strong { color: var(--ink-strong); font: 500 17px var(--font-display); }
.cr-avatar { display: inline-grid; place-items: center; flex-shrink: 0; width: 30px; height: 30px; border-radius: 50%; background: var(--surface-card-2); color: var(--muted); font-size: 12px; object-fit: cover; }
.cr-avatar.lg { width: 76px; height: 76px; }
.cr-chat, .cr-questions, .cr-people { display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; }
.cr-chat li { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 10px; }
.cr-chat strong { display: flex; align-items: center; gap: 6px; color: var(--ink-strong); font-size: 13px; }
.cr-chat p { margin: 3px 0 0; font-size: 14px; line-height: 1.45; overflow-wrap: anywhere; }
.cr-questions li { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; align-items: start; gap: 10px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.cr-questions li.answered { opacity: .55; }
.cr-questions p { margin: 0 0 4px; color: var(--ink-strong); font-size: 14px; line-height: 1.45; overflow-wrap: anywhere; }
.cr-questions small { color: var(--muted); font-size: 12px; }
.cr-vote { display: grid; justify-items: center; gap: 2px; padding: 6px 0; border: 1px solid var(--line-strong); border-radius: 10px; background: none; font-size: 10px !important; }
.cr-vote span { font-size: 14px; font-weight: 600; }
.cr-vote.voted { border-color: var(--ink-strong); background: var(--ink-strong); color: var(--bg) !important; opacity: 1 !important; }
.cr-people li { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.cr-people b { margin-left: auto; font-size: 17px; }
.cr-compose { display: flex; align-items: center; gap: 6px; margin: 4px 0 20px; padding: 4px 4px 4px 4px; border: 1px solid var(--line-strong); border-radius: 14px; }
.cr-compose input { min-height: 40px; border: 0; background: transparent; }
.cr-compose input:focus-visible { outline: none; }
.cr-compose:focus-within { border-color: var(--ink); }
.cr-compose-note { display: flex; justify-content: center; margin: 4px 0 20px; color: var(--muted); font-size: 13px; text-align: center; }

/* settings dialog */
.cr-overlay { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; padding: 16px; background: rgba(0, 0, 0, .45); }
.cr-dialog { width: min(460px, 100%); max-height: calc(100dvh - 32px); overflow: auto; padding: 22px; border-radius: 20px; background: var(--modal-bg, var(--panel-strong)); box-shadow: var(--shadow); }
.cr-dialog-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.cr-dialog h2 { margin: 0; color: var(--ink-strong); font: 600 20px var(--font-display); }
.cr-dialog h3 { margin: 6px 0 2px; color: var(--ink-strong); font: 600 15px var(--font-display); }
.cr-field-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.cr-session-form { display: grid; gap: 12px; padding-top: 16px; }
.cr-session-form label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
.cr-session-form label small { color: var(--dim); }
.cr-field-pair { display: grid; grid-template-columns: 1.5fr 1fr; gap: 10px; }
.cr-session-form .cr-pill { justify-self: start; margin-top: 4px; }

/* course page + catalog */
.cr-course-card { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.cr-course-card.is-live { border-color: color-mix(in srgb, var(--coral) 55%, transparent); }
.cr-course-card .eyebrow { display: flex; align-items: center; gap: 8px; }
.cr-live-badge { display: inline-flex; align-items: center; gap: 6px; margin-left: 8px; color: var(--coral); font: 700 10px var(--font-body); letter-spacing: .1em; vertical-align: middle; }

/* rail: unread markers */
.cr-badge { position: absolute; top: -9px; left: -8px; display: grid; place-items: center; min-width: 18px; height: 18px; padding: 0 5px; border-radius: 999px; background: var(--coral); color: #fff; font: 600 11px/1 var(--font-body); }
.cr-new-dot { position: absolute; top: 0; right: -8px; width: 6px; height: 6px; border-radius: 50%; background: var(--coral); }
.cr-rail-head { margin: 0 0 14px; color: var(--muted); font: 500 13px var(--font-body); }

/* rail: polls */
.cr-polls { display: grid; gap: 22px; margin: 0; padding: 0; list-style: none; }
.cr-poll { display: grid; gap: 14px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.cr-poll.closed { opacity: .8; }
.cr-poll .cr-text-btn { justify-self: start; }
.cr-poll-q { margin: 0; color: var(--ink-strong); font: 500 17px/1.35 var(--font-display); letter-spacing: -.01em; }
.cr-poll-choices { display: grid; gap: 4px; }
.cr-poll-choice { display: flex; align-items: center; gap: 14px; padding: 10px 4px; border: 0; border-radius: 10px; background: none; color: var(--ink-strong) !important; font-size: 16px !important; text-align: left; }
.cr-poll-choice:hover:not(:disabled) { background: var(--surface-hover); }
.cr-poll-choice i { flex-shrink: 0; width: 22px; height: 22px; border: 1.5px solid var(--line-strong); border-radius: 50%; transition: box-shadow .15s; }
.cr-poll-choice[aria-checked="true"] i { border-color: var(--ink-strong); box-shadow: inset 0 0 0 5px var(--cr-rail), inset 0 0 0 11px var(--ink-strong); }
.cr-poll-done { margin: 4px 0 0; padding: 10px; border: 1px solid var(--ink-strong); color: var(--ink); font-style: italic; text-align: center; }
.cr-poll-results { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.cr-poll-results div { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 5px; font-size: 14px; }
.cr-poll-results b { font-weight: 600; font-variant-numeric: tabular-nums; }
.cr-poll-results i { display: block; height: 6px; border-radius: 3px; background: linear-gradient(90deg, var(--ink-strong) var(--share), var(--line) var(--share)); }
.cr-poll-results li.mine span::after { content: " · your answer"; color: var(--muted); }
.cr-poll-meta, .cr-poll-note { color: var(--muted); font-size: 12px; }
.cr-poll-note { margin: 4px 0 20px; text-align: center; font-size: 13px; }
.cr-poll-form, .cr-doc-form { display: grid; gap: 8px; margin: 4px 0 20px; }
.cr-poll-form textarea { resize: vertical; min-height: 72px; }
.cr-poll-form .cr-pill, .cr-doc-actions .cr-pill { justify-self: start; height: 38px; padding: 0 18px; font-size: 14px !important; }
.cr-doc-actions { display: flex; align-items: center; gap: 8px; }
.cr-upload { display: inline-flex; align-items: center; cursor: pointer; }

/* rail: docs */
.cr-docs { display: grid; gap: 4px; margin: 0; padding: 0; list-style: none; }
.cr-docs li { display: flex; align-items: center; gap: 8px; }
.cr-docs a { display: flex; flex: 1; align-items: center; gap: 12px; min-width: 0; padding: 10px 8px; border-radius: 10px; color: var(--ink-strong); text-decoration: none; }
.cr-docs a:hover { background: var(--surface-hover); }
.cr-docs a svg { flex-shrink: 0; color: var(--muted); }
.cr-docs a span { min-width: 0; }
.cr-docs strong { display: block; overflow: hidden; font-size: 14px; font-weight: 500; text-overflow: ellipsis; white-space: nowrap; }
.cr-docs small { color: var(--muted); font-size: 12px; }

/* bar: who's in the room (opens People) */
.cr-stack { display: inline-flex; align-items: center; flex-shrink: 0; gap: 0; padding: 4px 10px 4px 4px; border: 0; border-radius: 999px; background: none; color: var(--ink) !important; font-size: 13px !important; }
.cr-stack:hover, .cr-stack.active { background: var(--surface-hover); }
.cr-stack .cr-avatar { width: 30px; height: 30px; margin-right: -8px; border: 2px solid var(--cr-surface-solid, var(--bg)); }
.cr-stack span { margin-left: 14px; font-variant-numeric: tabular-nums; }
.cr-stack b { margin-left: 6px; font-weight: 500; }

/* phone + small tablet: stage on top, rail becomes a bottom sheet */
@media (max-width: 900px) {
  .cr { grid-template-rows: 58px minmax(0, 1fr); }
  .cr-top { gap: 16px; padding: 0 12px; }
  .cr-tabs { gap: 16px; }
  .cr-tabs button { font-size: 15px; }
  .cr-top-actions .cr-pill { height: 36px; padding: 0 14px; font-size: 13px !important; }
  .cr-body, .cr.sheet-open .cr-body { grid-template-columns: minmax(0, 1fr); }
  .cr-main { grid-template-rows: auto auto; align-content: start; overflow-y: auto; padding: 0 8px 8px; }
  .cr-frame { padding: 10px; border-radius: 18px; }
  .cr-stage { aspect-ratio: 16 / 9; border-radius: 12px; }
  .cr-bar { flex-wrap: wrap; gap: 10px 14px; padding: 12px 14px; }
  .cr-bar-title { flex: 1 1 100%; order: -1; white-space: normal; }
  .cr-bar-controls { margin-left: 0; flex-wrap: wrap; }
  .cr-settings-btn { margin-left: auto; }
  .cr-rail { position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; height: 72dvh; padding: 0 18px; border-radius: 20px 20px 0 0; box-shadow: 0 -20px 60px rgba(0, 0, 0, .3); transform: translateY(105%); transition: transform .28s ease; }
  .cr.sheet-open .cr-rail { transform: none; }
  .cr-rail-tabs { padding-top: 16px; }
  .cr-sheet-close { display: grid !important; }
  .cr-float { width: 100%; bottom: 40vh; }
  .cr-course-card { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { .cr-dot { animation: none; } .cr-body, .cr-rail { transition: none; } }