.session-app { width: min(calc(100% - 2rem), var(--content)); margin: 0 auto; padding: clamp(2.5rem, 6vw, 5rem) 0; }
.session-intro { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(17rem, .75fr); align-items: end; gap: clamp(1.5rem, 4vw, 3rem); margin-bottom: 1.5rem; }
.session-intro h1 { max-width: 12ch; margin-bottom: .6rem; font-size: clamp(2.35rem, 6vw, 4.5rem); }
.session-private-note { margin: 0; }
.session-shell { display: grid; grid-template-columns: minmax(16rem, 21rem) minmax(0, 1fr); align-items: start; gap: clamp(1rem, 3vw, 2rem); margin-top: 1.5rem; }
.session-sidebar, .session-card, .session-empty { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); padding: clamp(1rem, 2.5vw, 1.5rem); }
.session-sidebar { position: sticky; top: 1rem; max-height: calc(100vh - 2rem); overflow: auto; }
.session-section-heading, .session-editor-heading, .session-current-activity { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.session-section-heading h2, .session-section-heading h3, .session-editor-heading h2 { margin-bottom: .25rem; }
.session-list { display: grid; gap: 1rem; margin: 1rem 0 1.5rem; }
.session-list section + section { border-top: 1px solid var(--line); padding-top: 1rem; }
.session-list h3 { margin-bottom: .55rem; font-size: .82rem; letter-spacing: .07em; text-transform: uppercase; }
.session-list ul { display: grid; gap: .4rem; margin: 0; padding: 0; list-style: none; }
.session-list button { width: 100%; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .2rem .75rem; text-align: left; }
.session-list button[aria-current="true"] { border-color: var(--accent); background: var(--surface-tint); }
.session-list button strong { overflow: hidden; text-overflow: ellipsis; }
.session-list button span { grid-column: 1 / -1; color: var(--muted); font-size: .8rem; }
.session-create { border-top: 1px solid var(--line); padding-top: 1.25rem; }
.session-create h3 { font-size: 1.1rem; }
.session-workspace { min-width: 0; }
.session-editor-heading { align-items: center; margin: .25rem 0 1rem; }
.session-editor-heading h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
.session-card + .session-card { margin-top: 1rem; }
.session-card h3 { font-size: 1.25rem; }
.session-activity-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; margin: 1rem 0; }
.session-activity-grid button { min-height: 6rem; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; text-align: left; }
.session-activity-grid button strong { font-size: 1rem; }
.session-activity-grid button span { color: var(--muted); font-size: .84rem; }
.session-current-activity { align-items: center; border-top: 1px solid var(--line); padding-top: 1rem; }
.session-current-activity p { margin: .25rem 0 0; color: var(--muted); }
.session-board { position: relative; overflow: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface-tint); padding: clamp(1rem, 4vw, 2rem); }
.session-board-controls { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: .65rem; }
.session-board > h2 { max-width: 18ch; font-size: clamp(2rem, 6vw, 4rem); }
.session-board-date { color: var(--muted); }
.session-board-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 2rem 0 0; }
.session-board-grid > div { min-width: 0; padding: 1rem; border-radius: var(--radius-sm); background: var(--surface); }
.session-board-grid dt { color: var(--muted); font-size: .82rem; font-weight: 750; text-transform: uppercase; letter-spacing: .05em; }
.session-board-grid dd { overflow-wrap: anywhere; margin: .35rem 0 0; font-size: clamp(1.1rem, 3vw, 1.65rem); font-weight: 800; }
.session-board-result { grid-column: 1 / -1; }
.session-board-result dd { font-size: clamp(1.7rem, 5vw, 3.5rem); }
.session-board:fullscreen, .session-board.is-presenting { width: 100%; height: 100%; max-width: none; border: 0; border-radius: 0; background: var(--bg); padding: clamp(1rem, 5vw, 5rem); }
.session-board.is-presenting { position: fixed; z-index: 900; inset: 0; }
.session-board:fullscreen .session-board-grid, .session-board.is-presenting .session-board-grid { align-content: center; min-height: 55vh; }
.session-history-list { display: grid; gap: .65rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.session-history-list li { display: grid; gap: .25rem; border-top: 1px solid var(--line); padding: .8rem 0 0; }
.session-history-list li:first-child { border-top: 0; }
.session-history-list strong, .session-board-result dd { white-space: pre-wrap; overflow-wrap: anywhere; }
.session-history-list span, .session-history-empty { color: var(--muted); font-size: .86rem; }
.session-notes-preview { white-space: pre-wrap; overflow-wrap: anywhere; }
.session-explainer { max-width: 54rem; border-top: 1px solid var(--line); margin-top: clamp(2rem, 6vw, 4rem); padding-top: 2rem; }

@media (max-width: 850px) {
  .session-intro, .session-shell { grid-template-columns: 1fr; }
  .session-sidebar { position: static; max-height: none; }
}

@media (max-width: 560px) {
  .session-app { width: min(calc(100% - 1rem), var(--content)); }
  .session-activity-grid, .session-board-grid { grid-template-columns: 1fr; }
  .session-board-result { grid-column: 1; }
  .session-section-heading, .session-current-activity { align-items: stretch; flex-direction: column; }
  .session-section-heading > .button, .session-current-activity button { width: 100%; }
}

@media print {
  .session-intro, #session-status, #session-error, .session-sidebar, .session-editor-heading, #session-edit-form, #session-activities, .session-board-preview > .session-section-heading, .session-board-controls, .session-explainer { display: none !important; }
  .session-app, .session-shell, .session-workspace { width: 100%; display: block; margin: 0; padding: 0; }
  .session-card { break-inside: avoid; border: 0; box-shadow: none; padding: .5rem 0; }
  .session-board { border: 0; background: white; padding: 0; }
  .session-board-grid > div { border: 1px solid #aaa; background: white; }
}