/* Mimi: warm paper, course red, gold rules. Controls use the system face;
   report prose retains the course's serif typography. */
.tc-app {
  --report-red: #c40000;
  --ui-muted: #58636b;
  height: calc(100 * var(--mimi-vh)); display: flex; flex-direction: column; overflow: hidden;
  background: var(--paper); color: var(--ink);
}
.tc-app [hidden] { display: none !important; }
.tc-header { display: flex; align-items: center; gap: 16px; min-height: 72px; padding: 12px clamp(16px, 3vw, 40px); border-bottom: 1px solid var(--gold-line); }
.tc-header .wordmark { font: 30px/1 var(--serif); color: var(--report-red); letter-spacing: -.04em; }
.tc-actions { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.tc-actions button { min-height: 44px; border-color: transparent; border-radius: 6px; padding: 8px 12px; color: var(--ink); }
.tc-actions button[data-tc="new"] { border-color: var(--gold-line); }
.tc-status { color: var(--ui-muted); font-size: 13px; }
.tc-body { display: flex; flex: 1; min-height: 0; }
.tc-chat { display: flex; flex-direction: column; flex: 1; min-width: 0; min-height: 0; }
.tc-scroll { flex: 1; min-height: 0; overflow: auto; width: min(740px, 100%); margin: 0 auto; padding: 32px 24px; scrollbar-gutter: stable; }
.tc-line { font-size: 16px; line-height: 1.7; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0 0 24px; }
.tc-teacher { max-width: 88%; width: fit-content; margin-left: auto; padding: 12px 18px; border-radius: 14px 14px 3px 14px; background: var(--soft); }
.tc-mimi { padding: 0; }
.tc-composer { width: min(740px, 100%); margin: 0 auto; padding: 16px 24px max(24px, env(safe-area-inset-bottom)); }
.tc-composer textarea { width: 100%; min-height: 56px; max-height: 180px; padding: 16px; border: 1px solid var(--gold-line); border-radius: 10px; background: var(--paper); resize: vertical; font-size: 16px; line-height: 1.5; }
.tc-composer textarea::placeholder { color: var(--ui-muted); }
.tc-chat.is-empty { justify-content: center; }
.tc-chat.is-empty .tc-scroll { display: none; }
.tc-chat.is-empty .tc-composer { margin: 0 auto; padding-bottom: 12vh; }
.tc-hint { margin: 8px 0 0; font-size: 13px; color: var(--ui-muted); }
.tc-empty { margin: 32px 0; color: var(--ui-muted); }
.tc-error { margin: 0; padding: 12px 24px; color: var(--report-red); font-size: 14px; }
.tc-sessions { width: min(740px, 100%); margin: 0 auto; padding: 24px; overflow: auto; }
.tc-session { display: flex; flex-direction: column; align-items: flex-start; width: 100%; text-align: left; gap: 8px; padding: 16px; border: 0; border-bottom: 1px solid var(--gold-line); border-radius: 0; }
.tc-session strong { font-size: 16px; font-weight: 500; overflow-wrap: anywhere; }
.tc-session small { color: var(--ui-muted); font-size: 13px; }
.tc-session.is-current { background: var(--soft); }

.tc-app :is(button, textarea):focus-visible { outline: 2px solid var(--red-dark); outline-offset: 3px; }
.tc-app button:disabled { opacity: .5; cursor: default; }
.tc-header { min-height: 64px; padding: 8px 16px; gap: 8px; }
.tc-header .wordmark { font-size: 27px; }
.tc-actions button { padding: 8px; font-size: 13px; }
.tc-scroll { padding: 24px 20px; }
.tc-composer { padding-left: 20px; padding-right: 20px; }

/* Desktop: the report occupies the window; the avatar is the only overlay. */
.mimi-stage {
  --avatar-size: clamp(200px, 35vmin, 420px);
  --avatar-scale: .26;
  --avatar-right: max(24px, env(safe-area-inset-right));
  --avatar-bottom: max(24px, env(safe-area-inset-bottom));
  --motion-travel: 700ms;
  --motion-ease: cubic-bezier(.22,.68,.16,1);
  --stage-accent: var(--red);
  position: relative; isolation: isolate; width: 100%; height: calc(100 * var(--mimi-vh));
  overflow: hidden; background: var(--paper); color: var(--ink);
}
.mimi-stage::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse at 50% 43%, #fffdfa00 16%, #fffdfa99 65%),
    radial-gradient(ellipse at 40% 42%, #e4ecdf99 0%, transparent 43%),
    radial-gradient(ellipse at 64% 48%, #f2dfd380 0%, transparent 42%),
    linear-gradient(145deg, #faf8f1, #fffdfa 55%, #f4f0e8);
}
.mimi-stage::after {
  content: ''; position: absolute; inset: 24px; pointer-events: none;
  border: 1px solid #c9bb9e40; border-radius: 24px;
}
.mimi-stage.has-report::before, .mimi-stage.has-report::after { display: none; }
.mimi-stage[data-phase="idle"]:not(.has-report) .mimi-presence {
  transform: translate(calc(50vw - var(--avatar-size)/2), calc(calc(44 * var(--mimi-vh)) - var(--avatar-size)/2));
}
.mimi-presence__standby {
  position: absolute; top: calc(100% + 58px); left: 50%; transform: translateX(-50%);
  width: max-content; max-width: 90vw; margin: 0;
  color: #4d5c54; font: 400 clamp(22px, 2.1vw, 32px)/1.4 var(--serif);
  letter-spacing: .015em; text-align: center;
}
.mimi-presence__standby::before {
  content: ''; display: block; width: 32px; height: 1px; margin: 0 auto 20px; background: #a99d7b;
}
.mimi-stage__report { position: absolute; inset: 0; background: var(--paper); animation: mimi-report-appear 480ms ease-out both; }
.mimi-stage__report iframe { display: block; width: 100%; height: 100%; border: 0; background: var(--paper); }
.mimi-presence {
  --voice-level: 0;
  --voice-motion: min(1, calc(var(--voice-level)*1.65));
  --idle-lift: -12px;
  position: absolute; z-index: 2; top: 0; left: 0;
  width: var(--avatar-size); aspect-ratio: 1; pointer-events: none;
  transform-origin: 0 0;
  transform: translate(calc(50vw - var(--avatar-size)/2), calc(calc(50 * var(--mimi-vh)) - var(--avatar-size)/2));
  transition: transform var(--motion-travel) var(--motion-ease);
}
.mimi-stage.has-report .mimi-presence {
  /* Compensate for the smaller avatar so motion stays visible on the report. */
  --idle-lift: -22px;
  transform: translate(calc(100vw - var(--avatar-size)*var(--avatar-scale) - var(--avatar-right)), calc(calc(100 * var(--mimi-vh)) - var(--avatar-size)*var(--avatar-scale) - var(--avatar-bottom))) scale(var(--avatar-scale));
}
.mimi-presence__breath { width: 100%; height: 100%; animation: mimi-breathe 3.4s ease-in-out infinite; }
.mimi-presence__portrait {
  width: 100%; height: 100%; padding: 8px; border: 1px solid var(--gold-line);
  border-radius: 50%; background: var(--paper);
  box-shadow: 0 24px 70px #485b421a, 0 4px 16px #59452b08;
  transform: translateY(calc(var(--voice-motion)*-6px)) scale(calc(1 + var(--voice-motion)*.085));
  transition: transform 80ms linear;
}
.mimi-presence__portrait img { display: block; width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.mimi-presence__orbit {
  position: absolute; inset: -22px; border: 1px solid #b8b79a; border-radius: 50%;
  opacity: .65; transition: opacity 250ms;
}
.mimi-presence__orbit::before {
  content: ''; position: absolute; inset: -17px; border: 1px solid #c5bd9d40; border-radius: inherit;
}
.mimi-presence__orbit::after {
  content: ''; position: absolute; inset: -1px; border-radius: inherit;
  border: 4px solid transparent; border-top-color: var(--stage-accent); border-right-color: var(--gold-line); opacity: 0;
}
.mimi-stage[data-phase="idle"] .mimi-presence__orbit { animation: mimi-presence-pulse 3.4s ease-in-out infinite; }
.mimi-stage[data-phase="generating"] .mimi-presence__orbit::after { opacity: 1; animation: mimi-orbit 1.65s linear infinite; }
.mimi-stage[data-phase="generating"] .mimi-presence__breath { animation-duration: 2.2s; }
.mimi-stage[data-phase="speaking"] .mimi-presence__orbit {
  border-color: var(--stage-accent); opacity: calc(.4 + var(--voice-motion)*.6);
  transform: scale(calc(1 + var(--voice-motion)*.13));
  transition: transform 80ms linear, opacity 80ms linear;
}
.mimi-presence__signal {
  position: absolute; bottom: -20px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; justify-content: center; gap: 7px;
  width: 108px; height: 48px; border: 1px solid var(--gold-line); border-radius: 99px;
  background: var(--paper); opacity: 0; transition: opacity 200ms;
}
.mimi-presence__signal i { width: 6px; height: 26px; border-radius: 4px; background: var(--stage-accent); transform: scaleY(calc(.14 + var(--voice-motion)*.86)); transition: transform 80ms linear; }
.mimi-presence__signal i:nth-child(2n) { height: 38px; }
.mimi-presence__signal i:nth-child(3) { height: 30px; }
.mimi-stage[data-phase="speaking"] .mimi-presence__signal { opacity: 1; }
.mimi-stage.has-report .mimi-presence__signal { bottom: -26px; transform: translateX(-50%) scale(1.65); transform-origin: center bottom; }
.mimi-stage__error { position: absolute; z-index: 3; bottom: 22px; left: 24px; max-width: min(560px, calc(100% - 190px)); margin: 0; padding: 8px 12px; border-radius: 6px; background: var(--paper); color: var(--red-dark); font-size: 14px; line-height: 1.5; }
@keyframes mimi-breathe { 0%,100% { transform: translateY(2px) rotate(-1deg) scale(.99); } 50% { transform: translateY(var(--idle-lift)) rotate(1.2deg) scale(1.035); } }
@keyframes mimi-presence-pulse { 0%,100% { transform: scale(.99); opacity: .45; } 50% { transform: scale(1.045); opacity: .85; } }
@keyframes mimi-orbit { to { transform: rotate(360deg); } }
@keyframes mimi-report-appear { from { opacity: 0; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .mimi-presence, .mimi-presence *, .mimi-presence *::after, .mimi-stage__report { animation: none !important; transition: none !important; }
  .mimi-presence__breath, .mimi-presence__portrait, .mimi-presence__orbit, .mimi-presence__signal i { transform: none !important; }
  .mimi-stage[data-phase="speaking"] .mimi-presence__orbit { opacity: .8; }
}

.mimi-stage [hidden] { display: none !important; }
.mimi-stage[data-phase="working"] .mimi-presence {
  transform: translate(calc(50vw - var(--avatar-size)*.62/2), calc(calc(24 * var(--mimi-vh)) - var(--avatar-size)*.62/2)) scale(.62);
}
.mimi-stage[data-phase="working"] .mimi-presence__orbit::after { opacity: 1; animation: mimi-orbit 1.65s linear infinite; }
.mimi-work { position: absolute; top: calc(40 * var(--mimi-vh)); left: 50%; transform: translateX(-50%); width: min(640px, calc(100% - 64px)); font-family: var(--sans); }
.mimi-work ol { list-style: none; margin: 0; padding: 0; }
.mimi-work li { display: flex; gap: 16px; align-items: center; min-height: 58px; font-size: clamp(17px, 1.5vw, 22px); transition: color 240ms, opacity 240ms; }
.mimi-work li.is-done { color: #657465; }
.mimi-work li.is-current { color: var(--red-dark); animation: mimi-call-appear 260ms ease-out both; }
.mimi-work__mark { flex: 0 0 18px; width: 18px; height: 18px; display: grid; place-items: center; font-size: 17px; }
.is-current .mimi-work__mark { border: 2px solid var(--gold-line); border-top-color: var(--red-dark); border-radius: 50%; animation: mimi-orbit 1.2s linear infinite; }
.mimi-work__note { margin: 24px 0 0 34px; min-height: 3em; font-size: clamp(15px, 1.2vw, 18px); line-height: 1.6; color: var(--muted, #655e56); }
.mimi-presence__return { position: absolute; inset: -14px; width: calc(100% + 28px); height: calc(100% + 28px); padding: 0; border: 0; border-radius: 50%; background: transparent; pointer-events: auto; cursor: pointer; }
.mimi-presence__return:hover { background: transparent; box-shadow: 0 0 0 3px var(--gold-line); }
.mimi-presence__return:focus-visible { outline: 5px solid var(--red-dark); outline-offset: 8px; }
.mimi-stage__error p { margin: 0 0 8px; }
.mimi-stage__error button { margin-right: 8px; min-height: 40px; padding: 6px 12px; font-size: 14px; }
@media (max-height: 600px) {
  .mimi-work { top: calc(35 * var(--mimi-vh)); }
  .mimi-work li { min-height: 34px; font-size: 16px; }
  .mimi-work__note { margin-top: 12px; font-size: 14px; }
  .mimi-stage[data-phase="working"] .mimi-presence { transform: translate(calc(50vw - var(--avatar-size)*.4/2), calc(calc(20 * var(--mimi-vh)) - var(--avatar-size)*.4/2)) scale(.4); }
}
@media (prefers-reduced-motion: reduce) { .mimi-work__mark { animation: none !important; } }

.mimi-work__action { display: flex; flex-direction: column; gap: 3px; padding: 4px 0; }
.mimi-work__action code { font: 12px/1.3 ui-monospace, SFMono-Regular, Consolas, monospace; opacity: .7; letter-spacing: .01em; }

.mimi-work__result { color: var(--muted, #655e56); font-size: 14px; line-height: 1.45; padding: 3px 0 8px; }
@keyframes mimi-call-appear { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { .mimi-work li.is-current { animation: none; } }

.mimi-stage__controls { position: absolute; z-index: 8; top: max(40px, env(safe-area-inset-top)); right: max(40px, env(safe-area-inset-right)); }
.mimi-stage__hamburger {
  display: grid; place-items: center; width: 48px; height: 48px; margin-left: auto;
  list-style: none; cursor: pointer; border: 1px solid #d3cbb880; border-radius: 50%;
  color: #576356; background: #fffdfaaf; box-shadow: 0 4px 16px #485b4206;
  transition: background 180ms, border-color 180ms;
}
.mimi-stage__hamburger::-webkit-details-marker { display: none; }
.mimi-stage__hamburger svg { fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
.mimi-stage__hamburger:hover, .mimi-stage__controls[open] .mimi-stage__hamburger { background: #fffdfa; border-color: #a9b19d; }
.mimi-stage__panel {
  position: absolute; right: 0; top: 60px; width: min(288px, calc(100vw - 48px));
  max-height: calc(100 * var(--mimi-vh) - 132px); overflow: auto;
  padding: 10px; border: 1px solid #ded7c8; border-radius: 18px;
  background: #fffdfa; box-shadow: 0 18px 55px #36432b1a;
}
.mimi-stage__settings, .mimi-stage__logout {
  display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 14px;
  border: 0; border-radius: 9px; color: #48544b; text-decoration: none;
  background: transparent; font: 400 14px/1.5 system-ui, sans-serif; justify-content: flex-start;
}
.mimi-stage__settings:hover, .mimi-stage__logout:hover { background: #f0f2e9; }
.mimi-stage__logout-error { margin: 8px 14px; color: var(--red-dark); font-size: 13px; }
.mimi-entry { margin: 8px 4px 4px; padding: 16px 10px 6px; border-top: 1px solid var(--line); color: #58645c; }
.mimi-entry p { font: 13px/1.6 system-ui, sans-serif; margin: 0 0 12px; overflow-wrap: anywhere; }
.mimi-entry button { width: 100%; border: 0; border-radius: 10px; padding: 10px 16px; background: #52664f; color: white; font: 500 14px/1.5 system-ui, sans-serif; }
.mimi-entry button:hover:not(:disabled) { background: #40553d; }
@media (max-width: 600px), (max-height: 500px) {
  .mimi-stage::after { inset: 12px; border-radius: 18px; }
  .mimi-stage__controls { top: max(24px, env(safe-area-inset-top)); right: max(24px, env(safe-area-inset-right)); }
  .mimi-presence__standby { top: calc(100% + 44px); font-size: 22px; }
  .mimi-presence__standby::before { margin-bottom: 12px; }
}
@media (max-height: 450px) {
  .mimi-stage { --avatar-size: 36vmin; }
  .mimi-presence__standby { top: calc(100% + 32px); font-size: 19px; }
  .mimi-presence__standby::before { display: none; }
}

.tc-reset{display:flex;align-items:center;gap:12px;flex-shrink:0;padding:8px 16px;border-bottom:1px solid var(--gold-line)}
.tc-reset button{min-height:44px;padding:8px 12px;color:var(--report-red);border:1px solid var(--gold-line);border-radius:6px;white-space:nowrap}
.tc-reset [role="status"]{font-size:13px;color:var(--ui-muted)}

[data-teacher-viewport]{position:fixed;top:var(--app-offset-top,0px);left:0;right:0;height:var(--app-height)}
[data-teacher-viewport] .tc-app{height:100%}
[data-teacher-viewport] .tc-header{flex-shrink:0}
[data-teacher-viewport] .tc-composer textarea{resize:none}
[data-teacher-viewport] .tc-error{max-height:64px;overflow:auto;flex-shrink:0}
[data-teacher-viewport][data-compact-viewport="true"] .tc-composer{padding:6px 16px max(6px,env(safe-area-inset-bottom))}
[data-teacher-viewport][data-compact-viewport="true"] .tc-composer textarea{min-height:44px;max-height:min(96px,calc(var(--app-height) * .3));padding:10px 12px}
[data-teacher-viewport][data-compact-viewport="true"] .tc-scroll{padding:12px 16px}
[data-teacher-viewport][data-compact-viewport="true"] .tc-header{min-height:48px;padding-block:2px}
[data-teacher-viewport][data-compact-viewport="true"] .tc-reset{padding-block:2px}