/* Aigent4U 2.0 — product experience layer */

/* Microinteractions */
.a4u-card {
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.a4u-card:hover {
  border-color: var(--a4u-border-strong);
  box-shadow: var(--a4u-shadow);
}

.a4u-fade-in {
  animation: a4uFadeIn 0.35s ease both;
}

@keyframes a4uFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Empty states */
.a4u-empty--compact {
  padding: 28px 16px;
}

.a4u-empty__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  border-radius: var(--a4u-radius-md);
  background: var(--a4u-surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--a4u-muted);
}

/* Activity feed */
.a4u-activity-feed {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-height: 420px;
  overflow-y: auto;
}

.a4u-activity-feed__item {
  display: flex;
  gap: 12px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--a4u-border);
  transition: background 0.15s;
}

.a4u-activity-feed__item:hover {
  background: var(--a4u-surface-hover);
}

.a4u-activity-feed__item:last-child {
  border-bottom: none;
}

.a4u-activity-feed__icon {
  width: 38px;
  height: 38px;
  border-radius: var(--a4u-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 15px;
  background: var(--a4u-surface-raised);
}

.a4u-activity-feed__item--ok .a4u-activity-feed__icon { color: var(--a4u-accent); background: var(--a4u-accent-soft); }
.a4u-activity-feed__item--warn .a4u-activity-feed__icon { color: var(--a4u-warning); background: var(--a4u-warning-soft); }
.a4u-activity-feed__item--error .a4u-activity-feed__icon { color: var(--a4u-danger); background: var(--a4u-danger-soft); }
.a4u-activity-feed__item--info .a4u-activity-feed__icon { color: var(--a4u-info); background: var(--a4u-info-soft); }

.a4u-activity-feed__body { flex: 1; min-width: 0; }
.a4u-activity-feed__row { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
.a4u-activity-feed__title { font-size: 14px; font-weight: 600; line-height: 1.35; }
.a4u-activity-feed__time { font-size: 11px; color: var(--a4u-muted); white-space: nowrap; }
.a4u-activity-feed__subtitle { font-size: 13px; color: var(--a4u-muted); margin-top: 3px; }

/* Health center */
.a4u-health {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.a4u-health__row {
  background: var(--a4u-bg);
  border: 1px solid var(--a4u-border);
  border-radius: var(--a4u-radius-sm);
  padding: 14px;
}

.a4u-health__label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--a4u-muted);
}

.a4u-health__state {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--a4u-radius-full);
}

.a4u-health__state--ok { color: #86efac; background: var(--a4u-accent-soft); }
.a4u-health__state--warn { color: #fcd34d; background: var(--a4u-warning-soft); }
.a4u-health__state--bad { color: #fca5a5; background: var(--a4u-danger-soft); }
.a4u-health__state--muted { color: var(--a4u-muted); background: var(--a4u-surface-raised); }

.a4u-health__msg {
  font-size: 13px;
  color: var(--a4u-text-secondary);
  margin-top: 8px;
  line-height: 1.45;
}

/* Queue timeline */
.a4u-timeline__summary {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--a4u-muted);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--a4u-border);
}

.a4u-timeline__summary strong { color: var(--a4u-text); }

.a4u-timeline__node {
  display: flex;
  gap: 14px;
  padding: 10px 0;
  position: relative;
}

.a4u-timeline__rail {
  width: 20px;
  display: flex;
  justify-content: center;
  position: relative;
}

.a4u-timeline__rail::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: -10px;
  width: 2px;
  background: var(--a4u-border);
  left: 50%;
  transform: translateX(-50%);
}

.a4u-timeline__node:last-child .a4u-timeline__rail::before { display: none; }

.a4u-timeline__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--a4u-surface-raised);
  border: 2px solid var(--a4u-border-strong);
  position: relative;
  z-index: 1;
  margin-top: 4px;
}

.a4u-timeline__node--done .a4u-timeline__dot { background: var(--a4u-accent); border-color: var(--a4u-accent); }
.a4u-timeline__node--running .a4u-timeline__dot {
  background: var(--a4u-music);
  border-color: var(--a4u-music);
  box-shadow: 0 0 0 4px var(--a4u-music-soft);
}

.a4u-timeline__title { font-size: 14px; font-weight: 600; }
.a4u-timeline__meta { font-size: 12px; color: var(--a4u-muted); margin-top: 2px; }
.a4u-timeline__node--running .a4u-timeline__title { color: var(--a4u-music); }

/* Live session card */
.a4u-session-card {
  overflow: hidden;
}

.a4u-session-card__hero {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.a4u-session-card__art {
  width: 88px;
  height: 88px;
  border-radius: var(--a4u-radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.a4u-session-card__art--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: rgba(255,255,255,0.85);
}

.a4u-session-card__badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: var(--a4u-radius-full);
  margin-bottom: 8px;
}

.a4u-session-card__badge--ok { background: var(--a4u-accent-soft); color: var(--a4u-accent); }
.a4u-session-card__badge--warn { background: var(--a4u-warning-soft); color: var(--a4u-warning); }
.a4u-session-card__badge--bad { background: var(--a4u-danger-soft); color: var(--a4u-danger); }

.a4u-session-card__hero-text { min-width: 0; flex: 1; }

.a4u-session-card__playlist {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.a4u-session-card__track {
  font-size: 13px;
  color: var(--a4u-muted);
  margin-top: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.a4u-session-card__progress {
  height: 4px;
  background: var(--a4u-bg);
  border-radius: var(--a4u-radius-full);
  margin: 18px 0 14px;
  overflow: hidden;
}

.a4u-session-card__progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--a4u-accent), var(--a4u-music));
  border-radius: inherit;
  transition: width 0.4s ease;
}

.a4u-session-card__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.a4u-session-card__stat-label {
  display: block;
  font-size: 10px;
  color: var(--a4u-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.a4u-session-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.a4u-session-card__hint {
  font-size: 11px;
  color: var(--a4u-muted-faint);
  margin-top: 12px;
}

/* AI Coach */
.a4u-coach__head {
  margin-bottom: 14px;
}

.a4u-coach__label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--a4u-music);
}

.a4u-coach__head h2 {
  font-size: 17px;
  font-weight: 700;
  margin-top: 4px;
}

.a4u-coach__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.a4u-coach__tip {
  padding: 12px;
  border-radius: var(--a4u-radius-sm);
  border: 1px solid var(--a4u-border);
  background: var(--a4u-bg);
}

.a4u-coach__tip strong { font-size: 13px; display: block; }
.a4u-coach__tip p { font-size: 13px; color: var(--a4u-muted); margin-top: 4px; line-height: 1.45; }
.a4u-coach__tip--ok { border-color: rgba(34,197,94,0.25); }
.a4u-coach__tip--warn { border-color: rgba(245,158,11,0.25); }
.a4u-coach__tip--info { border-color: rgba(96,165,250,0.25); }
.a4u-coach__footnote { font-size: 11px; color: var(--a4u-muted-faint); margin-top: 12px; }

/* Toasts */
.a4u-toast-stack {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: min(380px, calc(100vw - 32px));
  pointer-events: none;
}

.a4u-toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--pulse-radius-sm, var(--a4u-radius-sm));
  border: 1px solid var(--pulse-border, var(--a4u-border));
  background: var(--pulse-surface-raised, var(--a4u-surface-raised));
  box-shadow: var(--pulse-shadow-md, var(--a4u-shadow));
  pointer-events: auto;
  cursor: pointer;
  opacity: 0;
  transform: translateX(12px);
  transition:
    opacity var(--pulse-motion-base, 180ms) var(--pulse-ease-out, ease),
    transform var(--pulse-motion-base, 180ms) var(--pulse-ease-out, ease);
}

.a4u-toast--visible { opacity: 1; transform: translateX(0); }
.a4u-toast--exit { opacity: 0; transform: translateX(12px); }
.a4u-toast--success { border-color: color-mix(in srgb, var(--pulse-success, #22c55e) 40%, transparent); }
.a4u-toast--warning { border-color: color-mix(in srgb, var(--pulse-warning, #f59e0b) 40%, transparent); }
.a4u-toast--error { border-color: color-mix(in srgb, var(--pulse-danger, #ef4444) 40%, transparent); }
.a4u-toast--info { border-color: color-mix(in srgb, var(--pulse-info, #60a5fa) 40%, transparent); }
.a4u-toast__icon { font-weight: 700; flex-shrink: 0; }
.a4u-toast__msg { font-size: 13px; line-height: 1.4; }

/* Confirm dialog (shared — Community and other pages load experience.css) */
.a4u-confirm {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.a4u-confirm[hidden] { display: none !important; }

.a4u-confirm__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
}

.a4u-confirm__panel {
  position: relative;
  width: min(420px, 100%);
  background: var(--a4u-surface);
  border: 1px solid var(--a4u-border-strong);
  border-radius: var(--a4u-radius-md);
  padding: 22px;
  box-shadow: var(--a4u-shadow);
}

.a4u-confirm__title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}

.a4u-confirm__body {
  font-size: 14px;
  color: var(--a4u-muted);
  line-height: 1.45;
  margin: 0 0 18px;
}

.a4u-confirm__actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

/* Command palette */
.a4u-cmd {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px 16px;
}

.a4u-cmd[hidden] { display: none !important; }

.a4u-cmd__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
}

.a4u-cmd__panel {
  position: relative;
  width: min(560px, 100%);
  background: var(--a4u-surface);
  border: 1px solid var(--a4u-border-strong);
  border-radius: var(--a4u-radius-md);
  box-shadow: var(--a4u-shadow);
  overflow: hidden;
  animation: a4uFadeIn 0.2s ease;
}

.a4u-cmd__input {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--a4u-border);
  background: transparent;
  color: var(--a4u-text);
  font-family: var(--a4u-font);
  font-size: 15px;
  padding: 16px 18px;
  outline: none;
}

.a4u-cmd__list {
  max-height: 320px;
  overflow-y: auto;
  padding: 8px;
}

.a4u-cmd__item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: none;
  border-radius: var(--a4u-radius-sm);
  background: transparent;
  color: var(--a4u-text);
  font-family: var(--a4u-font);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}

.a4u-cmd__item:hover,
.a4u-cmd__item--active {
  background: var(--a4u-surface-hover);
}

.a4u-cmd__icon { width: 24px; text-align: center; }
.a4u-cmd__label { flex: 1; }
.a4u-cmd__group { font-size: 11px; color: var(--a4u-muted); }
.a4u-cmd__hint { padding: 10px 14px; font-size: 11px; color: var(--a4u-muted); border-top: 1px solid var(--a4u-border); }
.a4u-cmd__hint kbd { background: var(--a4u-bg); padding: 2px 6px; border-radius: 4px; border: 1px solid var(--a4u-border); }
.a4u-cmd__empty { padding: 20px; text-align: center; color: var(--a4u-muted); font-size: 13px; }

/* Nested dashboard sections */
.a4u-dash-section .a4u-session-card,
.a4u-dash-section .a4u-coach {
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
}

.a4u-dash-section .a4u-empty {
  padding: 28px 12px;
}

.a4u-dash-section { margin-bottom: 20px; }
.a4u-dash-row { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 16px; margin-bottom: 16px; }
.a4u-dash-row--3 { grid-template-columns: 2fr 1fr; }

@media (max-width: 1000px) {
  .a4u-health { grid-template-columns: 1fr; }
  .a4u-dash-row, .a4u-dash-row--3 { grid-template-columns: 1fr; }
  .a4u-session-card__stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .a4u-toast-stack { right: 12px; left: 12px; max-width: none; }
}