/* ═══════════════════════════════════════════════════════════════════════════
   Quizzman Classroom v2 — Product styles
   Built on QMF tokens. No Material / Bootstrap / Ant.
   Design mix: 40% SaaS · 30% Social · 20% Quiz Game · 10% Apple
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  --qm-accent: #4f46e5;
  --qm-accent-soft: color-mix(in srgb, var(--qm-accent) 12%, transparent);
  --qm-sidebar-w: 260px;
  --qm-header-h: var(--qmf-header-h, 64px);
  --qm-radius-card: var(--qmf-radius-2xl, 1rem);
  --qm-shadow-float: 0 8px 30px rgba(15, 23, 42, 0.08);
  --qm-shadow-hover: 0 16px 40px rgba(15, 23, 42, 0.12);
  --qm-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --qm-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --qm-motion-fast: 160ms;
  --qm-motion: 280ms;
  --qm-motion-slow: 480ms;
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--qmf-font-sans, Inter, system-ui, sans-serif);
  background: var(--qmf-bg-secondary, #f9fafb);
  color: var(--qmf-text-primary, #111827);
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
}

[data-theme="dark"] {
  --qmf-bg-primary: #0f1117;
  --qmf-bg-secondary: #151821;
  --qmf-bg-tertiary: #1c2030;
  --qmf-text-primary: #f3f4f6;
  --qmf-text-secondary: #9ca3af;
  --qmf-text-muted: #6b7280;
  --qmf-border-color: #2a3142;
  --qm-shadow-float: 0 8px 30px rgba(0, 0, 0, 0.35);
  --qm-shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.45);
}

/* ─── Boot splash ────────────────────────────────────────────────────────── */
.qm-boot {
  position: fixed; inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  background: var(--qmf-bg-primary);
  z-index: 9999;
  transition: opacity var(--qm-motion-slow) var(--qm-ease-out),
              visibility var(--qm-motion-slow);
}
.qm-boot.is-done { opacity: 0; visibility: hidden; pointer-events: none; }
.qm-boot__logo {
  width: 64px;
  height: 64px;
  animation: qm-float 2.4s ease-in-out infinite;
  filter: drop-shadow(0 8px 16px rgba(79, 70, 229, 0.22));
  background: transparent;
  border-radius: 22%;
}
.qm-boot__pulse {
  width: 36px; height: 3px; border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--qm-accent), transparent);
  background-size: 200% 100%;
  animation: qm-shimmer 1.2s linear infinite;
}
.qm-boot__label {
  margin: 0; color: var(--qmf-text-muted); font-size: 0.8rem; font-weight: 500;
}

@keyframes qm-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}
@keyframes qm-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes qm-fade-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes qm-scale-in {
  from { opacity: 0; transform: scale(0.94); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes qm-slide-in {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes qm-pop {
  0% { transform: scale(0.6); opacity: 0; }
  60% { transform: scale(1.12); }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes qm-count {
  from { transform: translateY(40%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ─── Shell layout (below QMF global header) ─────────────────────────────── */
.qm-shell {
  display: grid;
  grid-template-columns: var(--qm-sidebar-w) 1fr;
  min-height: calc(100vh - var(--qm-header-h));
  min-height: calc(100dvh - var(--qm-header-h));
}

.qm-shell__content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* App toolbar — secondary bar under global header (not a second brand header) */
.qm-toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem clamp(1rem, 3vw, 2rem);
  flex-wrap: wrap;
}
.qm-toolbar__title {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--qmf-text-secondary);
}
.qm-toolbar__logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: transparent;
  object-fit: contain;
}
.qm-toolbar__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}
.qm-toolbar--room {
  padding-bottom: 0;
  border-bottom: none;
}

/* QMF global header — Classroom product tweaks */
body.has-qmf-header .lab-header__logo {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  border-radius: 22% !important;
  object-fit: contain;
  /* Clip residual dark squircle fringe at small sizes */
  clip-path: inset(6% round 24%);
  -webkit-clip-path: inset(6% round 24%);
}

body.qm-classroom-header .lab-header::after {
  background: linear-gradient(90deg, #4f46e5, #a855f7, #f59e0b);
}

/* Product logos — transparent canvas + clip fringe */
.qm-boot__logo,
.qm-toolbar__logo {
  background: transparent;
  border-radius: 22%;
  /* Soft-clip residual dark fringe on the app-icon asset */
  clip-path: inset(3.5% round 22%);
  -webkit-clip-path: inset(3.5% round 22%);
}

.qm-search {
  flex: 1; max-width: 480px; position: relative;
}
.qm-search input {
  width: 100%;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--qmf-border-color);
  background: var(--qmf-bg-secondary);
  padding: 0 1rem 0 2.5rem;
  font: inherit; color: inherit;
  transition: border-color var(--qm-motion-fast), box-shadow var(--qm-motion-fast),
              background var(--qm-motion-fast);
}
.qm-search input:focus {
  outline: none;
  border-color: var(--qm-accent);
  box-shadow: 0 0 0 3px var(--qm-accent-soft);
  background: var(--qmf-bg-primary);
}
.qm-search__icon {
  position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; color: var(--qmf-text-muted); pointer-events: none;
}

.qm-icon-btn {
  width: 40px; height: 40px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--qmf-text-secondary);
  display: grid; place-items: center;
  cursor: pointer;
  position: relative;
  transition: background var(--qm-motion-fast), transform var(--qm-motion-fast) var(--qm-ease-spring),
              color var(--qm-motion-fast);
}
.qm-icon-btn:hover {
  background: var(--qmf-bg-tertiary);
  color: var(--qmf-text-primary);
  transform: translateY(-1px);
}
.qm-icon-btn:active { transform: scale(0.94); }
.qm-icon-btn svg { width: 20px; height: 20px; }
.qm-badge {
  position: absolute; top: 6px; right: 6px;
  min-width: 16px; height: 16px; padding: 0 4px;
  border-radius: 999px;
  background: var(--qmf-color-danger, #ef4444);
  color: white; font-size: 10px; font-weight: 700;
  display: grid; place-items: center;
  animation: qm-pop 0.35s var(--qm-ease-spring);
}

.qm-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--qm-accent), #a855f7);
  color: white; font-weight: 700; font-size: 0.85rem;
  display: grid; place-items: center;
  overflow: hidden; cursor: pointer;
  box-shadow: 0 0 0 2px var(--qmf-bg-primary), 0 0 0 3px var(--qm-accent-soft);
  transition: transform var(--qm-motion-fast) var(--qm-ease-spring);
}
.qm-avatar:hover { transform: scale(1.06); }
.qm-avatar img { width: 100%; height: 100%; object-fit: cover; }

/* ─── Sidebar ────────────────────────────────────────────────────────────── */
.qm-sidebar {
  border-right: 1px solid var(--qmf-border-color);
  background: var(--qmf-bg-primary);
  padding: 1rem 0.75rem;
  display: flex; flex-direction: column; gap: 0.25rem;
  overflow-y: auto;
  position: sticky; top: var(--qm-header-h);
  height: calc(100vh - var(--qm-header-h));
  height: calc(100dvh - var(--qm-header-h));
  align-self: start;
}

.qm-nav-item {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.7rem 0.85rem;
  border-radius: 12px;
  color: var(--qmf-text-secondary);
  text-decoration: none;
  font-weight: 500; font-size: 0.95rem;
  border: none; background: transparent; width: 100%;
  cursor: pointer; text-align: left;
  transition: background var(--qm-motion-fast), color var(--qm-motion-fast),
              transform var(--qm-motion-fast) var(--qm-ease-spring);
}
.qm-nav-item svg { width: 20px; height: 20px; flex-shrink: 0; }
.qm-nav-item:hover {
  background: var(--qmf-bg-tertiary);
  color: var(--qmf-text-primary);
  transform: translateX(2px);
}
.qm-nav-item.is-active {
  background: var(--qm-accent-soft);
  color: var(--qm-accent);
  font-weight: 600;
}
.qm-nav-item.is-active svg { stroke: var(--qm-accent); }

.qm-sidebar__section {
  margin-top: 1rem;
  padding: 0 0.85rem 0.4rem;
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--qmf-text-muted);
}

.qm-class-chip {
  display: flex; align-items: center; gap: 0.65rem;
  padding: 0.65rem 0.75rem;
  border-radius: 14px;
  border: 1px solid var(--qmf-border-color);
  background: var(--qmf-bg-secondary);
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: box-shadow var(--qm-motion), transform var(--qm-motion-fast) var(--qm-ease-spring);
}
.qm-class-chip:hover {
  box-shadow: var(--qm-shadow-float);
  transform: translateY(-1px);
}
.qm-class-chip__avatar {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--qm-accent); color: white;
  display: grid; place-items: center; font-weight: 700;
  overflow: hidden; flex-shrink: 0;
}
.qm-class-chip__avatar img { width: 100%; height: 100%; object-fit: cover; }
.qm-class-chip__meta { min-width: 0; }
.qm-class-chip__name {
  font-weight: 600; font-size: 0.9rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.qm-class-chip__sub {
  font-size: 0.75rem; color: var(--qmf-text-muted);
}

/* ─── Main ───────────────────────────────────────────────────────────────── */
.qm-main {
  padding: 1.5rem clamp(1rem, 3vw, 2.5rem) 3rem;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  animation: qm-fade-up var(--qm-motion-slow) var(--qm-ease-out);
}

.qm-page-title {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 1rem; margin-bottom: 1.25rem;
}
.qm-page-title h1 {
  margin: 0; font-size: clamp(1.5rem, 2.5vw, 1.85rem);
  letter-spacing: -0.03em; font-weight: 700;
}
.qm-page-title p {
  margin: 0.25rem 0 0; color: var(--qmf-text-secondary); font-size: 0.95rem;
}

/* ─── Buttons (QMF-aligned) ──────────────────────────────────────────────── */
.qm-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  height: 40px; padding: 0 1rem;
  border-radius: 12px; border: 1px solid transparent;
  font: inherit; font-weight: 600; font-size: 0.9rem;
  cursor: pointer;
  transition: transform var(--qm-motion-fast) var(--qm-ease-spring),
              box-shadow var(--qm-motion), background var(--qm-motion-fast),
              border-color var(--qm-motion-fast);
}
.qm-btn svg { width: 18px; height: 18px; }
.qm-btn:active { transform: scale(0.96); }
.qm-btn--primary {
  background: var(--qm-accent); color: white;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--qm-accent) 35%, transparent);
}
.qm-btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px color-mix(in srgb, var(--qm-accent) 40%, transparent);
}
.qm-btn--ghost {
  background: transparent; color: var(--qmf-text-secondary);
  border-color: var(--qmf-border-color);
}
.qm-btn--ghost:hover {
  background: var(--qmf-bg-tertiary); color: var(--qmf-text-primary);
}
.qm-btn--soft {
  background: var(--qm-accent-soft); color: var(--qm-accent);
}
.qm-btn--sm {
  height: 34px;
  padding: 0 0.75rem;
  font-size: 0.82rem;
  border-radius: 10px;
}

/* ─── Settings panel (not feed card) ─────────────────────────────────────── */
.qm-panel {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border-color);
  border-radius: var(--qm-radius-card);
  padding: 1.25rem 1.35rem 1.15rem;
  box-shadow: var(--qm-shadow-float);
  max-width: 560px;
}
.qm-panel .qm-field { margin-bottom: 0.95rem; }
.qm-panel .qm-field input,
.qm-panel .qm-field textarea {
  width: 100%;
  box-sizing: border-box;
}
.qm-panel .qm-field.is-dimmed { opacity: 0.45; pointer-events: none; }
.qm-field--inline {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.qm-field--inline input[type="color"] {
  width: 48px;
  height: 36px;
  padding: 0.15rem;
  border-radius: 10px;
  cursor: pointer;
}
.qm-panel__footer {
  display: flex;
  justify-content: flex-end;
  padding-top: 0.5rem;
  margin-top: 0.35rem;
  border-top: 1px solid var(--qmf-border-color);
}

.qm-settings-avatar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.15rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--qmf-border-color);
}
.qm-settings-avatar__preview {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  overflow: hidden;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.2);
}
.qm-settings-avatar__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.qm-settings-avatar__meta { min-width: 0; flex: 1; }
.qm-settings-avatar__title {
  font-weight: 650;
  font-size: 0.95rem;
}
.qm-settings-avatar__meta p {
  margin: 0.2rem 0 0.65rem;
  font-size: 0.8rem;
  color: var(--qmf-text-muted);
}
.qm-settings-avatar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.qm-settings-access {
  margin: 0.25rem 0 0.5rem;
  padding: 0.85rem 0.95rem;
  border-radius: 14px;
  background: var(--qmf-bg-secondary);
  border: 1px solid var(--qmf-border-color);
}
.qm-settings-access .qm-field { margin-bottom: 0; margin-top: 0.85rem; }
.qm-join-code {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  min-width: 0;
}
.qm-join-code input {
  flex: 1;
  min-width: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.04em;
}
.qm-join-code .qm-btn {
  flex-shrink: 0;
}

.qm-switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.qm-switch-row__title {
  font-weight: 650;
  font-size: 0.92rem;
}
.qm-switch-row p {
  margin: 0.2rem 0 0;
  font-size: 0.78rem;
  color: var(--qmf-text-muted);
  max-width: 34ch;
}
.qm-switch {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
  cursor: pointer;
}
.qm-switch.is-disabled { opacity: 0.5; cursor: not-allowed; }
.qm-switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.qm-switch__track {
  width: 44px;
  height: 26px;
  border-radius: 999px;
  background: var(--qmf-bg-tertiary);
  border: 1px solid var(--qmf-border-color);
  display: block;
  position: relative;
  transition: background var(--qm-motion-fast), border-color var(--qm-motion-fast);
}
.qm-switch__track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.2);
  transition: transform var(--qm-motion) var(--qm-ease-spring);
}
.qm-switch input:checked + .qm-switch__track {
  background: var(--qm-accent);
  border-color: var(--qm-accent);
}
.qm-switch input:checked + .qm-switch__track::after {
  transform: translateX(18px);
}
.qm-switch input:focus-visible + .qm-switch__track {
  box-shadow: 0 0 0 3px var(--qm-accent-soft);
}

/* ─── Composer ───────────────────────────────────────────────────────────── */
.qm-composer {
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border-color);
  border-radius: var(--qm-radius-card);
  padding: 1rem 1.15rem;
  box-shadow: var(--qm-shadow-float);
  margin-bottom: 1.25rem;
  transition: box-shadow var(--qm-motion), transform var(--qm-motion-fast);
  animation: qm-scale-in var(--qm-motion) var(--qm-ease-out);
}
.qm-composer:focus-within {
  box-shadow: var(--qm-shadow-hover);
  border-color: color-mix(in srgb, var(--qm-accent) 40%, var(--qmf-border-color));
}
.qm-composer--community {
  border-style: dashed;
  border-width: 1.5px;
}
.qm-composer__label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--qmf-text-secondary);
}
.qm-composer__label svg { width: 16px; height: 16px; }
.qm-composer__top {
  display: flex; gap: 0.85rem; align-items: flex-start;
}
.qm-composer textarea {
  flex: 1; min-height: 64px; resize: none;
  border: none; outline: none; background: transparent;
  font: inherit; color: inherit; line-height: 1.5;
}
.qm-composer__types {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.85rem;
}
.qm-type-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  height: 32px;
  padding: 0 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--qmf-border-color);
  background: var(--qmf-bg-secondary);
  color: var(--qmf-text-secondary);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--qm-motion-fast), color var(--qm-motion-fast),
              border-color var(--qm-motion-fast), transform var(--qm-motion-fast);
}
.qm-type-chip svg { width: 14px; height: 14px; }
.qm-type-chip:hover {
  color: var(--qmf-text-primary);
  border-color: color-mix(in srgb, var(--qm-accent) 35%, var(--qmf-border-color));
}
.qm-type-chip.is-active {
  background: var(--qm-accent-soft);
  color: var(--qm-accent);
  border-color: color-mix(in srgb, var(--qm-accent) 40%, transparent);
}
.qm-composer__tools {
  display: flex; align-items: center; gap: 0.35rem;
  margin-top: 0.75rem; padding-top: 0.75rem;
  border-top: 1px solid var(--qmf-border-color);
}
.qm-composer__tools .qm-icon-btn { width: 36px; height: 36px; }
.qm-composer__tools .qm-btn { margin-left: auto; }
#poll-builder { margin-top: 0.75rem; }

/* ─── Identity strip ─────────────────────────────────────────────────────── */
.qm-identity {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-height: 80px;
  padding: 0.85rem 1.1rem;
  margin-bottom: 1rem;
  border-radius: 16px;
  border: 1px solid var(--qmf-border-color);
  background:
    linear-gradient(110deg, color-mix(in srgb, var(--qm-accent) 10%, transparent), transparent 55%),
    var(--qmf-bg-primary);
  box-shadow: var(--qm-shadow-float);
  animation: qm-fade-up var(--qm-motion) var(--qm-ease-out);
}
.qm-identity__mark {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  background: var(--id-cover, var(--qm-accent));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.18);
}
.qm-identity__main { flex: 1; min-width: 0; }
.qm-identity__name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.qm-identity__stats {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--qmf-text-muted);
}
.qm-identity__dot {
  width: 3px; height: 3px; border-radius: 50%;
  background: var(--qmf-text-muted);
  opacity: 0.6;
}
.qm-identity__online {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: #15803d;
  font-weight: 600;
}
.qm-identity__online svg { width: 8px; height: 8px; color: var(--qmf-color-success); }
.qm-identity__prompt {
  margin: 0;
  max-width: 160px;
  text-align: right;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--qmf-text-secondary);
  line-height: 1.3;
}

/* ─── Feed cards ─────────────────────────────────────────────────────────── */
.qm-member-row {
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border-color);
  border-radius: var(--qm-radius-card);
  padding: 0.9rem 1.1rem;
  box-shadow: var(--qm-shadow-float);
  animation: qm-fade-up var(--qm-motion-slow) var(--qm-ease-out) both;
}

.qm-timeline__day {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qmf-text-muted);
}
.qm-timeline__list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-left: 0.85rem;
  border-left: 2px solid color-mix(in srgb, var(--qm-accent) 22%, var(--qmf-border-color));
}

.qm-card {
  display: flex;
  gap: 0.85rem;
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border-color);
  border-radius: var(--qm-radius-card);
  padding: 1rem 1.1rem;
  box-shadow: var(--qm-shadow-float);
  transition: transform var(--qm-motion) var(--qm-ease-out),
              box-shadow var(--qm-motion);
  animation: qm-fade-up var(--qm-motion-slow) var(--qm-ease-out) both;
}
.qm-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--qm-shadow-hover);
}
.qm-card__rail {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: var(--qmf-bg-tertiary);
  color: var(--qmf-text-secondary);
}
.qm-card__rail svg { width: 18px; height: 18px; }
.qm-card__content { flex: 1; min-width: 0; }
.qm-card--announce {
  border-color: color-mix(in srgb, #f59e0b 35%, var(--qmf-border-color));
  background: linear-gradient(180deg, #fffbeb, var(--qmf-bg-primary) 42%);
}
.qm-card--announce .qm-card__rail { background: #fef3c7; color: #b45309; }
.qm-card--assign {
  border-color: color-mix(in srgb, #3b82f6 35%, var(--qmf-border-color));
  background: linear-gradient(180deg, #eff6ff, var(--qmf-bg-primary) 42%);
}
.qm-card--assign .qm-card__rail { background: #dbeafe; color: #1d4ed8; }
.qm-card--poll {
  border-color: color-mix(in srgb, #8b5cf6 35%, var(--qmf-border-color));
  background: linear-gradient(180deg, #f5f3ff, var(--qmf-bg-primary) 42%);
}
.qm-card--poll .qm-card__rail { background: #ede9fe; color: #6d28d9; }
.qm-card--question {
  border-color: color-mix(in srgb, #06b6d4 30%, var(--qmf-border-color));
}
.qm-card--question .qm-card__rail { background: #cffafe; color: #0e7490; }
.qm-card--material .qm-card__rail { background: #ecfdf5; color: #047857; }
.qm-card--system {
  background: var(--qmf-bg-secondary);
  box-shadow: none;
}
.qm-card.is-pinned {
  border-color: color-mix(in srgb, var(--qm-accent) 45%, var(--qmf-border-color));
  background:
    linear-gradient(180deg, var(--qm-accent-soft), transparent 48%),
    var(--qmf-bg-primary);
}

.qm-card__head {
  display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.85rem;
}
.qm-card__meta { flex: 1; min-width: 0; }
.qm-card__author { font-weight: 600; font-size: 0.95rem; }
.qm-card__time { font-size: 0.78rem; color: var(--qmf-text-muted); }
.qm-chip {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.15rem 0.55rem; border-radius: 999px;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.02em;
  text-transform: uppercase;
  background: var(--qmf-bg-tertiary); color: var(--qmf-text-secondary);
}
.qm-chip svg { width: 12px; height: 12px; }
.qm-chip--announce { background: #fef3c7; color: #b45309; }
.qm-chip--assign { background: #dbeafe; color: #1d4ed8; }
.qm-chip--quizzman {
  background: linear-gradient(135deg, #312e81, #4f46e5);
  color: #eef2ff;
}
.qm-card__headline {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #1d4ed8;
  margin-bottom: 0.25rem;
}
.qm-card__title {
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin-bottom: 0.55rem;
}
.qm-card__links {
  display: grid;
  gap: 0.45rem;
  margin: 0.35rem 0 0.85rem;
}
.qm-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 0.8rem;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, #3b82f6 28%, var(--qmf-border-color));
  background: #fff;
  color: #1d4ed8;
  font-weight: 650;
  font-size: 0.9rem;
  text-decoration: none;
}
.qm-card__link:hover {
  background: #eff6ff;
}
.qm-card__link svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}
.qm-assign-share {
  margin: 0.2rem 0 0.9rem;
  padding: 0.85rem;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, #3b82f6 28%, var(--qmf-border-color));
  background:
    linear-gradient(160deg, #eff6ff 0%, #fff 55%);
}
.qm-assign-share__row {
  display: flex;
  gap: 0.9rem;
  align-items: stretch;
}
.qm-assign-share__qr {
  flex: 0 0 auto;
  display: grid;
  gap: 0.35rem;
  justify-items: center;
  align-content: start;
}
.qm-assign-share__qr img {
  width: 132px;
  height: 132px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #e2e8f0;
  padding: 6px;
  object-fit: contain;
}
.qm-assign-share__qr span {
  font-size: 0.72rem;
  font-weight: 650;
  color: var(--qmf-text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.qm-assign-share__side {
  flex: 1 1 auto;
  min-width: 0;
  display: grid;
  gap: 0.75rem;
  align-content: center;
}
.qm-assign-share__label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #1d4ed8;
  margin-bottom: 0.2rem;
}
.qm-assign-share__code {
  display: block;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  font-variant-numeric: tabular-nums;
  color: #0f172a;
  margin-bottom: 0.45rem;
}
.qm-assign-share__url {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: #1d4ed8;
  text-decoration: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 0.45rem;
}
.qm-assign-share__url:hover {
  text-decoration: underline;
}
.qm-assign-share__link-actions,
.qm-assign-share__code-block {
  min-width: 0;
}
.qm-assign-share__link-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.qm-assign-share__copy {
  font-size: 0.82rem;
}
@media (max-width: 640px) {
  .qm-assign-share__row {
    flex-direction: column;
    align-items: center;
  }
  .qm-assign-share__side {
    width: 100%;
  }
}
.qm-chip--poll { background: #ede9fe; color: #6d28d9; }
.qm-chip--system { background: #e5e7eb; color: #374151; }
.qm-chip--material { background: #d1fae5; color: #047857; }
.qm-chip--question { background: #cffafe; color: #0e7490; }
.qm-chip--pin { background: var(--qm-accent-soft); color: var(--qm-accent); }

.qm-card__body {
  font-size: 0.98rem; line-height: 1.6;
  white-space: pre-wrap; word-break: break-word;
  margin-bottom: 0.85rem;
}

.qm-card__actions {
  display: flex; align-items: center; gap: 0.35rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--qmf-border-color);
}
.qm-action {
  display: inline-flex; align-items: center; gap: 0.4rem;
  height: 34px; padding: 0 0.7rem;
  border-radius: 10px; border: none;
  background: transparent; color: var(--qmf-text-secondary);
  font: inherit; font-size: 0.85rem; font-weight: 500;
  cursor: pointer;
  transition: background var(--qm-motion-fast), color var(--qm-motion-fast),
              transform var(--qm-motion-fast) var(--qm-ease-spring);
}
.qm-action svg { width: 18px; height: 18px; }
.qm-action:hover { background: var(--qmf-bg-tertiary); color: var(--qmf-text-primary); }
.qm-action.is-active { color: var(--qm-accent); background: var(--qm-accent-soft); }
.qm-action.is-active svg { animation: qm-pop 0.35s var(--qm-ease-spring); }
.qm-action__count { font-variant-numeric: tabular-nums; animation: qm-count 0.3s var(--qm-ease-out); }

/* ─── Poll ───────────────────────────────────────────────────────────────── */
.qm-poll { display: flex; flex-direction: column; gap: 0.5rem; margin: 0.5rem 0 1rem; }
.qm-poll__q { font-weight: 600; margin-bottom: 0.25rem; }
.qm-poll__opt {
  position: relative; overflow: hidden;
  border: 1px solid var(--qmf-border-color);
  border-radius: 12px; padding: 0.7rem 0.9rem;
  background: var(--qmf-bg-secondary);
  cursor: pointer; text-align: left; font: inherit;
  transition: border-color var(--qm-motion-fast), transform var(--qm-motion-fast) var(--qm-ease-spring);
}
.qm-poll__opt:hover { border-color: var(--qm-accent); transform: translateX(2px); }
.qm-poll__opt.is-mine { border-color: var(--qm-accent); }
.qm-poll__bar {
  position: absolute; inset: 0 auto 0 0;
  background: var(--qm-accent-soft);
  transition: width var(--qm-motion-slow) var(--qm-ease-out);
  z-index: 0;
}
.qm-poll__label, .qm-poll__pct {
  position: relative; z-index: 1;
}
.qm-poll__row { display: flex; justify-content: space-between; gap: 0.5rem; }

/* ─── Comments ───────────────────────────────────────────────────────────── */
.qm-comments {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--qmf-border-color);
  display: none;
  animation: qm-fade-up var(--qm-motion) var(--qm-ease-out);
}
.qm-comments.is-open { display: block; }
.qm-comment {
  display: flex; gap: 0.65rem; padding: 0.55rem 0;
  animation: qm-slide-in var(--qm-motion) var(--qm-ease-out);
}
.qm-comment__bubble {
  background: var(--qmf-bg-secondary);
  border-radius: 14px; padding: 0.55rem 0.8rem;
  flex: 1;
}
.qm-comment__author { font-weight: 600; font-size: 0.85rem; }
.qm-comment__body { font-size: 0.9rem; margin-top: 0.15rem; white-space: pre-wrap; }
.qm-comment-form {
  display: flex; gap: 0.5rem; margin-top: 0.5rem;
}
.qm-comment-form input {
  flex: 1; height: 38px; border-radius: 999px;
  border: 1px solid var(--qmf-border-color);
  background: var(--qmf-bg-secondary);
  padding: 0 1rem; font: inherit; color: inherit;
}
.qm-comment-form input:focus {
  outline: none; border-color: var(--qm-accent);
  box-shadow: 0 0 0 3px var(--qm-accent-soft);
}

/* ─── Empty / skeleton / error ───────────────────────────────────────────── */
.qm-empty {
  text-align: center; padding: 3rem 1.5rem;
  background: var(--qmf-bg-primary);
  border: 1px dashed var(--qmf-border-color);
  border-radius: var(--qm-radius-card);
  animation: qm-scale-in var(--qm-motion) var(--qm-ease-out);
}
.qm-empty__art {
  width: 120px; height: 120px; margin: 0 auto 1rem;
}
.qm-empty h3 { margin: 0 0 0.35rem; }
.qm-empty p { margin: 0 0 1.25rem; color: var(--qmf-text-secondary); }
.qm-empty__actions {
  display: flex;
  justify-content: center;
  gap: 0.625rem;
}

.qm-skel {
  background: linear-gradient(90deg,
    var(--qmf-bg-tertiary) 25%,
    var(--qmf-bg-secondary) 50%,
    var(--qmf-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: qm-shimmer 1.4s linear infinite;
  border-radius: 10px;
}
.qm-skel-card { height: 140px; margin-bottom: 1rem; border-radius: var(--qm-radius-card); }

.qm-toast-host {
  position: fixed; right: 1rem; bottom: 1rem; z-index: var(--qmf-z-toast, 700);
  display: flex; flex-direction: column; gap: 0.5rem;
}
.qm-toast {
  min-width: 260px; max-width: 360px;
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border-color);
  border-radius: 14px; padding: 0.85rem 1rem;
  box-shadow: var(--qm-shadow-hover);
  animation: qm-slide-in var(--qm-motion) var(--qm-ease-spring);
  display: flex; gap: 0.65rem; align-items: flex-start;
}
.qm-toast__title { font-weight: 600; font-size: 0.9rem; }
.qm-toast__msg { font-size: 0.82rem; color: var(--qmf-text-secondary); }

/* ─── Content-first classroom dashboard ────────────────────────────────── */
.qm-home {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem clamp(1rem, 2.5vw, 2rem) 2rem;
}
.qm-home > .qm-toolbar {
  min-height: 52px;
  padding: 0 0 0.85rem;
  margin-bottom: 0.25rem;
  border-bottom: 1px solid var(--qmf-border-color);
}
.qm-home .qm-toolbar__title h1 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.25;
  color: var(--qmf-text-primary);
  letter-spacing: -0.02em;
}

.qm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  padding-top: 0.875rem;
}
.qm-room-card {
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border-color);
  border-radius: 18px;
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--qm-shadow-float);
  transition: transform var(--qm-motion) var(--qm-ease-spring),
              box-shadow var(--qm-motion),
              border-color var(--qm-motion-fast);
  animation: qm-fade-up var(--qm-motion-slow) var(--qm-ease-out) both;
}
.qm-room-card:hover {
  transform: translateY(-6px) scale(1.015);
  box-shadow: var(--qm-shadow-hover);
  border-color: color-mix(in srgb, var(--room-accent, var(--qm-accent)) 35%, var(--qmf-border-color));
}
.qm-room-card__cover {
  position: relative;
  height: 132px;
  overflow: hidden;
  background: var(--room-cover, var(--qm-accent));
}
.qm-room-card__cover-img,
.qm-room-card__cover-art {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.45s var(--qm-ease-out);
}
.qm-room-card__cover-img--avatar {
  object-position: center;
}
.qm-room-card:hover .qm-room-card__cover-img,
.qm-room-card:hover .qm-room-card__cover-art {
  transform: scale(1.06);
}
.qm-room-card__cover-label {
  position: absolute;
  left: 0.85rem;
  bottom: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 8px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(15, 23, 42, 0.38);
  backdrop-filter: blur(6px);
}
.qm-room-card__quick {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem;
  background: rgba(15, 23, 42, 0.42);
  opacity: 0;
  transition: opacity var(--qm-motion-fast);
}
.qm-room-card:hover .qm-room-card__quick,
.qm-room-card:focus-within .qm-room-card__quick {
  opacity: 1;
}
.qm-room-card__qa {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  height: 34px;
  padding: 0 0.7rem;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  color: #0f172a;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transform: translateY(6px);
  transition: transform var(--qm-motion) var(--qm-ease-spring),
              background var(--qm-motion-fast);
}
.qm-room-card:hover .qm-room-card__qa { transform: translateY(0); }
.qm-room-card__qa:hover { background: #fff; }
.qm-room-card__qa svg { width: 14px; height: 14px; }
.qm-room-card__body { padding: 0.9rem 1rem 1rem; }
.qm-room-card__title-row {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}
.qm-room-card__avatar {
  width: 40px; height: 40px; border-radius: 12px;
  flex-shrink: 0;
  display: grid; place-items: center;
  font-weight: 700; font-size: 0.85rem; color: #fff;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.2);
}
.qm-room-card__avatar img { width: 100%; height: 100%; object-fit: cover; }
.qm-room-card__titles { min-width: 0; flex: 1; }
.qm-room-card h3 {
  margin: 0 0 0.15rem;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.qm-room-card p {
  margin: 0;
  color: var(--qmf-text-muted);
  font-size: 0.82rem;
}
.qm-room-card__activity {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.75rem;
  padding: 0.45rem 0.6rem;
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--qmf-text-secondary);
  background: var(--qmf-bg-secondary);
}
.qm-room-card__activity-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--qmf-text-muted);
  flex-shrink: 0;
}
.qm-room-card__activity--hot {
  background: color-mix(in srgb, #f97316 12%, var(--qmf-bg-secondary));
  color: #c2410c;
}
.qm-room-card__activity--hot .qm-room-card__activity-dot { background: #f97316; }
.qm-room-card__activity--live {
  background: color-mix(in srgb, var(--qmf-color-success) 12%, var(--qmf-bg-secondary));
  color: #15803d;
}
.qm-room-card__activity--live .qm-room-card__activity-dot {
  background: var(--qmf-color-success);
  animation: qm-pulse 1.8s ease-out infinite;
}
.qm-room-card__activity--teach {
  background: var(--qm-accent-soft);
  color: var(--qm-accent);
}
.qm-room-card__activity--teach .qm-room-card__activity-dot { background: var(--qm-accent); }
.qm-room-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.65rem;
  font-size: 0.75rem;
  color: var(--qmf-text-muted);
}
.qm-room-card__role {
  text-transform: capitalize;
  font-weight: 600;
}
.qm-room-card__alive {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: #15803d;
  font-weight: 600;
}
.qm-room-card__alive svg { width: 8px; height: 8px; color: var(--qmf-color-success); }

/* ─── Dialog ─────────────────────────────────────────────────────────────── */
.qm-dialog-backdrop {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(6px);
  display: grid; place-items: center;
  z-index: var(--qmf-z-modal, 500);
  padding: 1rem;
  animation: qm-fade-up var(--qm-motion-fast) ease-out;
}
.qm-dialog {
  width: min(440px, 100%);
  background: var(--qmf-bg-primary);
  border-radius: 20px;
  border: 1px solid var(--qmf-border-color);
  box-shadow: var(--qm-shadow-hover);
  padding: 1.5rem;
  animation: qm-scale-in var(--qm-motion) var(--qm-ease-spring);
}
.qm-dialog h2 { margin: 0 0 0.35rem; letter-spacing: -0.02em; }
.qm-dialog p { margin: 0 0 1.1rem; color: var(--qmf-text-secondary); font-size: 0.9rem; }
.qm-field { display: flex; flex-direction: column; gap: 0.35rem; margin-bottom: 0.85rem; }
.qm-field label { font-size: 0.82rem; font-weight: 600; color: var(--qmf-text-secondary); }
.qm-field input, .qm-field textarea {
  height: 42px; border-radius: 12px;
  border: 1px solid var(--qmf-border-color);
  background: var(--qmf-bg-secondary);
  padding: 0 0.9rem; font: inherit; color: inherit;
}
.qm-field textarea { height: auto; min-height: 80px; padding: 0.7rem 0.9rem; resize: vertical; }
.qm-field input:focus, .qm-field textarea:focus {
  outline: none; border-color: var(--qm-accent);
  box-shadow: 0 0 0 3px var(--qm-accent-soft);
  background: var(--qmf-bg-primary);
}
.qm-dialog__actions {
  display: flex; justify-content: flex-end; gap: 0.5rem; margin-top: 0.5rem;
}

/* ─── Presence pill ──────────────────────────────────────────────────────── */
.qm-presence {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.25rem 0.65rem; border-radius: 999px;
  background: color-mix(in srgb, var(--qmf-color-success) 14%, transparent);
  color: var(--qmf-color-success-dark, #15803d);
  font-size: 0.75rem; font-weight: 600;
}
.qm-presence__dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--qmf-color-success);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--qmf-color-success) 50%, transparent);
  animation: qm-pulse 1.8s ease-out infinite;
}
@keyframes qm-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--qmf-color-success) 50%, transparent); }
  70% { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .qm-shell { grid-template-columns: 1fr; }
  .qm-sidebar {
    position: fixed; left: 0; top: var(--qm-header-h);
    width: min(280px, 86vw); z-index: 250;
    transform: translateX(-105%);
    transition: transform var(--qm-motion) var(--qm-ease-out);
    box-shadow: var(--qm-shadow-hover);
  }
  .qm-sidebar.is-open { transform: translateX(0); }
  .qm-home > .qm-toolbar {
    align-items: center;
  }
}

@media (max-width: 520px) {
  .qm-home {
    padding-inline: 0.75rem;
  }
  .qm-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.625rem;
  }
  .qm-room-card__cover {
    height: 96px;
  }
  .qm-room-card__quick {
    display: none;
  }
  .qm-identity {
    flex-wrap: wrap;
    min-height: auto;
  }
  .qm-identity__prompt {
    width: 100%;
    max-width: none;
    text-align: left;
    margin-top: 0.15rem;
  }
  .qm-home .qm-toolbar__title h1 {
    font-size: 1.1rem;
  }
  .qm-toolbar__actions .qm-btn {
    padding-inline: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}