/* AI 学习空间站 · 助教面板四种皮肤样式 */
#chat-panel {
  --tutor-hud-size: 88px;
  --phone-avatar-size: 112px;
  --phone-stage-top: 108px;
  --phone-stage-bottom: 156px;
  --tutor-accent: var(--accent, #6366f1);
  --phone-border-angle: 0deg;
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  transition: width 0.28s ease, min-width 0.28s ease;
}

/* 通话中 · 面板炫彩氛围 + 四边平滑流光边框 */
@property --phone-border-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

#chat-panel.is-phone-live-glow {
  box-shadow:
    -6px 0 36px color-mix(in srgb, #22d3ee 22%, transparent),
    -8px 0 56px color-mix(in srgb, var(--accent) 18%, transparent),
    -4px 0 24px color-mix(in srgb, #a78bfa 14%, transparent);
}
.phone-panel-aurora {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.58;
  mix-blend-mode: screen;
  background:
    radial-gradient(ellipse 70% 50% at 28% 32%, color-mix(in srgb, #22d3ee 32%, transparent), transparent 58%),
    radial-gradient(ellipse 75% 50% at 82% 78%, color-mix(in srgb, #a78bfa 34%, transparent), transparent 55%),
    radial-gradient(ellipse 60% 45% at 52% 48%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 52%),
    radial-gradient(ellipse 50% 40% at 70% 18%, color-mix(in srgb, #f472b6 20%, transparent), transparent 48%);
  animation: phonePanelAuroraDrift 11s ease-in-out infinite alternate;
}
#chat-panel.is-phone-live-glow .phone-panel-aurora {
  display: block;
}
@keyframes phonePanelAuroraDrift {
  0% {
    transform: scale(1) translate(0, 0);
    filter: hue-rotate(0deg) saturate(1.05);
  }
  50% {
    transform: scale(1.06) translate(-2%, 1%);
    filter: hue-rotate(18deg) saturate(1.28);
  }
  100% {
    transform: scale(1.02) translate(2%, -1%);
    filter: hue-rotate(-12deg) saturate(1.18);
  }
}
.phone-panel-border-glow {
  display: none;
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 6;
  overflow: hidden;
  border-radius: 12px;
}
#chat-panel.is-phone-live-glow .phone-panel-border-glow {
  display: block;
  animation: phoneBorderAngleFlow 5.8s linear infinite;
}
.phone-panel-border-glow::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 2px;
  background: conic-gradient(
    from var(--phone-border-angle),
    transparent 0deg,
    color-mix(in srgb, #22d3ee 82%, transparent) 14deg,
    color-mix(in srgb, #22d3ee 28%, transparent) 32deg,
    transparent 52deg,
    color-mix(in srgb, #a78bfa 78%, transparent) 88deg,
    color-mix(in srgb, #a78bfa 24%, transparent) 106deg,
    transparent 126deg,
    color-mix(in srgb, var(--accent) 72%, transparent) 158deg,
    color-mix(in srgb, var(--accent) 22%, transparent) 176deg,
    transparent 196deg,
    color-mix(in srgb, #34d399 68%, transparent) 228deg,
    color-mix(in srgb, #34d399 20%, transparent) 246deg,
    transparent 266deg,
    color-mix(in srgb, #60a5fa 66%, transparent) 298deg,
    color-mix(in srgb, #f472b6 18%, transparent) 316deg,
    transparent 360deg
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}
.phone-panel-border-glow::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  padding: 4px;
  opacity: 0.62;
  background: conic-gradient(
    from calc(var(--phone-border-angle) + 48deg),
    transparent 0deg,
    color-mix(in srgb, #22d3ee 45%, transparent) 28deg,
    transparent 72deg,
    color-mix(in srgb, #e879f9 40%, transparent) 128deg,
    transparent 168deg,
    color-mix(in srgb, #fbbf24 38%, transparent) 220deg,
    transparent 260deg,
    color-mix(in srgb, #60a5fa 42%, transparent) 312deg,
    transparent 360deg
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  filter: blur(7px);
}
@keyframes phoneBorderAngleFlow {
  to { --phone-border-angle: 360deg; }
}
html.reduce-motion .phone-panel-border-glow {
  animation: none;
}
html.reduce-motion .phone-panel-border-glow::before,
html.reduce-motion .phone-panel-border-glow::after {
  opacity: 0.45;
}
html.reduce-motion .phone-panel-aurora {
  animation: none;
}
#chat-panel.is-phone-live-glow > .tutor-panel-root {
  position: relative;
  z-index: 1;
}

#chat-panel[data-tutor-skin="ambient"] {
  width: min(340px, 92vw);
  min-width: 280px;
  overflow: visible;
}
#chat-panel[data-tutor-skin="ambient"].is-expanded {
  width: min(340px, 92vw);
  min-width: 280px;
}
.app.tutor-ambient-layout {
  grid-template-columns: 240px minmax(0, 1fr) 340px;
}
.app.tutor-ambient-layout:has(#chat-panel.is-expanded) {
  grid-template-columns: 240px minmax(0, 1fr) 340px;
}

.tutor-panel-root,
.tutor-panel-root > .chat-inner {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.tutor-panel-root .chat-logs {
  flex: 1;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
  -webkit-overflow-scrolling: touch;
}

.tutor-panel-root #chat-log,
.tutor-panel-root #phone-log {
  flex: none;
  overflow: visible;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  align-items: stretch;
}

#chat-panel[data-tutor-skin="ambient"]:not(.is-expanded) .tutor-panel-root {
  overflow: visible;
}

.tutor-panel-root {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

/* ── 共用 HUD ── */
.tutor-hud {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 12px 10px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}
.tutor-hud-avatar-wrap {
  position: relative;
  width: var(--tutor-hud-size);
  height: var(--tutor-hud-size);
  display: grid;
  place-items: center;
}
.tutor-hud-avatar {
  width: calc(var(--tutor-hud-size) - 28px);
  height: calc(var(--tutor-hud-size) - 28px);
  border-radius: 50%;
  display: grid;
  place-items: center;
  position: relative;
  overflow: visible;
  background: var(--panel2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.tutor-hud-avatar > [data-tutor-avatar] {
  position: relative;
  z-index: 2;
}
.tutor-hud-title {
  margin: 0;
  font-size: 0.92rem;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* Scene Card — removed */

/* Phone mode · HUD 固定 · 通话区独立在 HUD 下方 */
.tutor-panel-root > .chat-inner.is-phone-mode {
  display: flex;
  flex-direction: column;
}
.tutor-panel-root > .chat-inner.is-phone-mode #tutor-quick-orbit,
.tutor-panel-root > .chat-inner.is-phone-mode #tutor-thread-nav,
.tutor-panel-root > .chat-inner.is-phone-mode #tutor-xray-panel,
.tutor-panel-root > .chat-inner.is-phone-mode .chat-head {
  display: none !important;
}
.tutor-panel-root > .chat-inner.is-phone-mode #tutor-hud {
  flex-shrink: 0;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  isolation: isolate;
  transition: background 0.85s ease;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 110% 80% at 50% 22%, color-mix(in srgb, #22d3ee 52%, transparent), transparent 58%),
    radial-gradient(ellipse 95% 65% at 50% 92%, color-mix(in srgb, var(--accent) 42%, transparent), transparent 52%),
    radial-gradient(circle at 12% 74%, color-mix(in srgb, #a78bfa 38%, transparent), transparent 46%),
    radial-gradient(circle at 88% 18%, color-mix(in srgb, #60a5fa 36%, transparent), transparent 42%),
    radial-gradient(circle at 72% 62%, color-mix(in srgb, #f472b6 28%, transparent), transparent 40%),
    radial-gradient(circle at 28% 38%, color-mix(in srgb, #34d399 24%, transparent), transparent 38%),
    linear-gradient(
      168deg,
      color-mix(in srgb, #0284c7 42%, var(--panel2, var(--panel))),
      color-mix(in srgb, var(--accent) 34%, var(--panel, var(--panel2))) 32%,
      color-mix(in srgb, #4f46e5 44%, var(--panel2, var(--panel))) 68%,
      color-mix(in srgb, #0e7490 38%, var(--panel, var(--panel2))) 100%
    );
  background-size: 120% 120%, 120% 120%, 100% 100%, 100% 100%, 100% 100%, 100% 100%, 100% 100%;
  animation: phoneLiveBgBreath 7s ease-in-out infinite, phoneLiveBgShift 14s ease-in-out infinite alternate;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live > *,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-title,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .chat-modes-bar,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar-wrap,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #phone-bottom-dock,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #chat-foot {
  position: relative;
  z-index: 1;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #phone-bottom-dock {
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--accent) 6%, transparent));
  border-top-color: color-mix(in srgb, var(--accent) 18%, var(--line));
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-title,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .chat-modes-bar {
  background: transparent;
}
@keyframes phoneLiveBgBreath {
  0%,
  100% {
    opacity: 0.92;
    filter: saturate(1.12) brightness(0.96) hue-rotate(0deg);
  }
  50% {
    opacity: 1;
    filter: saturate(1.38) brightness(1.1) hue-rotate(12deg);
  }
}
@keyframes phoneLiveBgShift {
  0% { background-position: 0% 0%, 100% 100%, 0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%; }
  100% { background-position: 8% 6%, 92% 94%, 6% 4%, 0% 0%, 4% 8%, 0% 0%, 0% 0%; }
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live::before {
  content: "";
  order: 3;
  flex: 1 1 auto;
  min-height: calc(var(--phone-avatar-size) + 32px);
  pointer-events: none;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live-measure::before {
  content: "";
  order: 3;
  flex: 1 1 auto;
  min-height: calc(var(--phone-avatar-size) + 32px);
  pointer-events: none;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud {
  display: contents;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-title {
  order: 1;
  flex-shrink: 0;
  width: 100%;
  padding: 14px 12px 0;
  border-bottom: none;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .chat-modes-bar {
  order: 2;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar-wrap,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live-measure .tutor-hud-avatar-wrap {
  order: 3;
  position: absolute;
  left: 0;
  right: 0;
  top: var(--phone-stage-top);
  bottom: var(--phone-stage-bottom);
  flex: none;
  width: 100%;
  min-height: 0;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
  z-index: 2;
  pointer-events: none;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live-measure .tutor-hud-avatar {
  width: var(--phone-avatar-size);
  height: var(--phone-avatar-size);
  position: relative;
  z-index: 2;
  overflow: visible;
  pointer-events: auto;
  flex-shrink: 0;
  transition: outline-color 0.25s ease, outline-width 0.25s ease;
  transform: none !important;
  box-shadow:
    0 0 0 1px color-mix(in srgb, #fff 24%, transparent),
    0 12px 40px color-mix(in srgb, var(--accent) 28%, transparent),
    0 0 48px color-mix(in srgb, #22d3ee 18%, transparent);
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar > [data-tutor-avatar],
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live-measure .tutor-hud-avatar > [data-tutor-avatar] {
  transform: scale(1.08);
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #phone-bottom-dock {
  order: 10;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #chat-hint,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .chat-logs,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #phone-panel,
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #phone-hud-call {
  display: none !important;
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live #phone-bottom-dock {
  display: flex !important;
  flex-shrink: 0;
}
.tutor-panel-root > .chat-inner.is-phone-mode .chat-modes-bar {
  flex-shrink: 0;
}
.tutor-panel-root .chat-modes-row .chat-mode-btn {
  height: 32px;
  min-height: 32px;
  max-height: 32px;
}
.tutor-panel-root > .chat-inner.is-phone-mode #chat-voice-out-row {
  display: none !important;
}
.tutor-panel-root > .chat-inner.is-phone-mode #phone-hud-call {
  display: flex !important;
  flex-shrink: 0;
}
.tutor-panel-root > .chat-inner.is-phone-mode #phone-bottom-dock {
  display: none !important;
}
.tutor-panel-root > .chat-inner.is-phone-mode .chat-logs {
  flex: 1;
  min-height: 100px;
}
.tutor-panel-root > .chat-inner.is-phone-mode #phone-panel:not(.is-live) {
  display: none !important;
}
.tutor-panel-root > .chat-inner.is-phone-mode #phone-panel.is-live {
  display: none !important;
}

.phone-hud-call {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 0 12px 8px;
  border-bottom: 1px solid var(--line);
}
.phone-call-btn--hero {
  width: min(100%, 220px);
  min-height: 44px;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  gap: 10px;
  box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 28%, transparent);
}
.phone-call-btn--hero iconify-icon {
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.12));
}
.phone-hud-status {
  margin: 0;
  font-size: 0.72rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.4;
}
.tutor-panel-root > .chat-inner.is-phone-live .phone-call-btn--hero.active {
  background: color-mix(in srgb, #ef4444 18%, var(--panel2));
  border-color: color-mix(in srgb, #ef4444 35%, var(--line));
}

.phone-bottom-dock {
  display: none;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding: 0 12px 12px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--accent) 4%, transparent));
  flex-shrink: 0;
}
.phone-bottom-dock .phone-asr-viz-zone {
  position: relative;
  height: 72px;
  min-height: 72px;
  max-height: 72px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: transparent;
  pointer-events: none;
}
.phone-bottom-dock .phone-asr-viz-zone .fm-asr-canvas {
  width: 100%;
  height: 100%;
  display: block;
}
.phone-bottom-dock .phone-bottom-status {
  margin: 0 0 6px;
  padding: 0 4px;
  font-size: 0.72rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.4;
  min-height: 1.4em;
}
.phone-bottom-dock .phone-bottom-status:empty {
  display: none;
}
.phone-call-slot-bottom {
  display: flex;
  justify-content: center;
  min-height: 44px;
}
.phone-call-slot-bottom .phone-call-btn--hero {
  width: min(100%, 220px);
}
.phone-bottom-dock .phone-call-btn--hero.active,
.phone-bottom-dock .phone-call-btn--hero.is-hangup-morph {
  width: min(100%, 220px);
  min-height: 44px;
  margin: 0 auto;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  gap: 10px;
  background: color-mix(in srgb, #ef4444 18%, var(--panel2));
  border-color: color-mix(in srgb, #ef4444 35%, var(--line));
  color: color-mix(in srgb, #ef4444 88%, var(--text));
  box-shadow: 0 8px 24px color-mix(in srgb, #ef4444 22%, transparent);
}
.phone-bottom-dock .phone-asr-viz-zone[hidden] {
  display: none !important;
}

/* 接通动效 */
.tutor-panel-root > .chat-inner.is-phone-connecting {
  overflow: visible;
}
.tutor-panel-root > .chat-inner.is-phone-connecting .tutor-hud-avatar-wrap {
  overflow: visible;
}
.tutor-panel-root > .chat-inner.is-phone-connecting .tutor-hud-avatar {
  z-index: 110;
}
.tutor-panel-root > .chat-inner.is-phone-connecting #phone-hud-call {
  visibility: hidden;
}
.tutor-panel-root > .chat-inner.is-phone-live-measure {
  position: relative;
  display: flex;
  flex-direction: column;
}
.tutor-panel-root > .chat-inner.is-phone-live-measure .tutor-hud {
  display: contents;
}
.tutor-panel-root > .chat-inner.is-phone-live-measure #phone-bottom-dock {
  display: flex !important;
  visibility: hidden;
  flex-shrink: 0;
}

/* 通话中 · 头像震光波（同心圆渐隐扩散） */
.tutor-avatar-pulse-rings {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--phone-avatar-size);
  height: var(--phone-avatar-size);
  margin-left: calc(var(--phone-avatar-size) * -0.5);
  margin-top: calc(var(--phone-avatar-size) * -0.5);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.55s ease;
}
.tutor-avatar-pulse-rings.is-live {
  opacity: 1;
}
.tutor-avatar-pulse-rings span {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid color-mix(in srgb, #22d3ee 58%, transparent);
  box-shadow:
    0 0 10px color-mix(in srgb, #22d3ee 44%, transparent),
    inset 0 0 8px color-mix(in srgb, #22d3ee 16%, transparent);
  opacity: 0;
  transform: scale(1);
  animation: tutorAvatarPulseRing 3.4s cubic-bezier(0.22, 0.61, 0.36, 1) infinite;
}
.tutor-avatar-pulse-rings span:nth-child(1) {
  animation-delay: 0s;
  border-color: color-mix(in srgb, #22d3ee 62%, transparent);
}
.tutor-avatar-pulse-rings span:nth-child(2) {
  animation-delay: 0.85s;
  border-color: color-mix(in srgb, #a78bfa 58%, transparent);
  box-shadow: 0 0 10px color-mix(in srgb, #a78bfa 40%, transparent);
}
.tutor-avatar-pulse-rings span:nth-child(3) {
  animation-delay: 1.7s;
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 36%, transparent);
}
.tutor-avatar-pulse-rings span:nth-child(4) {
  animation-delay: 2.55s;
  border-color: color-mix(in srgb, #34d399 52%, transparent);
  box-shadow: 0 0 10px color-mix(in srgb, #34d399 38%, transparent);
}
@keyframes tutorAvatarPulseRing {
  0% {
    transform: scale(1);
    opacity: 0;
  }
  14% {
    opacity: 0.78;
  }
  58% {
    opacity: 0.22;
  }
  100% {
    transform: scale(1.92);
    opacity: 0;
  }
}
html.reduce-motion .tutor-avatar-pulse-rings.is-live {
  opacity: 0.45;
}
html.reduce-motion .tutor-avatar-pulse-rings span {
  animation: none;
  opacity: 0.35;
  transform: scale(1.35);
}

#phone-call-btn.is-hangup-morph {
  background: color-mix(in srgb, #ef4444 18%, var(--panel2));
  border-color: color-mix(in srgb, #ef4444 35%, var(--line));
  color: color-mix(in srgb, #ef4444 88%, var(--text));
  box-shadow: 0 8px 24px color-mix(in srgb, #ef4444 22%, transparent);
}

html.reduce-motion .tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live::after {
  animation: none;
}

.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar.state-listen {
  outline: 2px solid rgba(56, 189, 248, 0.42);
  outline-offset: 4px;
  box-shadow: var(--shadow);
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar.state-speak {
  outline: 2px solid rgba(52, 211, 153, 0.42);
  outline-offset: 4px;
  box-shadow: var(--shadow);
}
.tutor-panel-root > .chat-inner.is-phone-mode.is-phone-live .tutor-hud-avatar.state-think {
  outline: 2px solid rgba(167, 139, 250, 0.42);
  outline-offset: 4px;
  box-shadow: var(--shadow);
}
.tutor-hud-avatar.state-listen {
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.35);
}
.tutor-hud-avatar.state-speak {
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.35);
}
.tutor-hud-avatar.state-think {
  box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.35);
}

/* Quick Orbit */
.tutor-quick-orbit {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px 12px 0;
}
.tutor-orbit-chip {
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--input-bg);
  font-size: 0.65rem;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.tutor-orbit-chip:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* 简报帧 (deck) */
.tutor-brief-frame {
  align-self: flex-start;
  max-width: 94%;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--input-bg);
  overflow: hidden;
}
.tutor-brief-frame.user-frame {
  align-self: flex-end;
  background: var(--accent-soft);
}
.tutor-brief-tag {
  display: inline-block;
  padding: 3px 8px;
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  border-bottom: 1px solid var(--line);
}
.tutor-brief-body {
  padding: 8px 10px;
  font-size: 0.76rem;
  line-height: 1.5;
  white-space: pre-wrap;
}
.tutor-brief-fold {
  padding: 4px 10px 8px;
  font-size: 0.72rem;
  color: var(--accent);
  cursor: pointer;
  border: none;
  background: transparent;
}

/* Thread (B) */
.tutor-thread-nav {
  display: flex;
  gap: 4px;
  padding: 8px 12px 0;
  overflow-x: auto;
}
.tutor-thread-tab {
  flex-shrink: 0;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--input-bg);
  font-size: 0.72rem;
  cursor: pointer;
}
.tutor-thread-tab.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.tutor-thread-log {
  position: relative;
  padding-left: 22px;
}
.tutor-thread-log::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
  opacity: 0.5;
}
.tutor-thread-node {
  position: relative;
  margin-bottom: 12px;
  padding: 8px 10px 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--input-bg);
  font-size: 0.82rem;
  line-height: 1.5;
}
.tutor-thread-node::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 14px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
.tutor-thread-node.user-node::before { background: var(--green, #34d399); }
.tutor-thread-node.agent-node::before { background: var(--accent); }
.tutor-thread-node-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 0.68rem;
  color: var(--muted);
}
.tutor-thread-link {
  font-size: 0.68rem;
  color: var(--accent);
  cursor: pointer;
  border: none;
  background: transparent;
  padding: 0;
}

/* X-Ray (C) */
.tutor-xray-panel {
  margin: 8px 12px 0;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed color-mix(in srgb, var(--accent) 40%, var(--line));
  background: color-mix(in srgb, var(--accent) 6%, var(--panel2));
  font-size: 0.75rem;
}
.tutor-xray-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 0.78rem;
}
.tutor-xray-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.tutor-xray-chip {
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--input-bg);
  font-size: 0.68rem;
  font-family: ui-monospace, monospace;
}
.tutor-xray-chip.is-live { border-color: var(--green); color: var(--green); }
.tutor-xray-meters {
  display: flex;
  gap: 10px;
  margin-top: 8px;
  font-size: 0.68rem;
  color: var(--muted);
}
.tutor-xray-meter em {
  font-style: normal;
  color: var(--text);
  font-weight: 600;
}
.tutor-xray-retrieval {
  padding: 8px 12px;
  font-size: 0.78rem;
  color: var(--accent);
  animation: tutorScan 1.2s ease infinite;
}
.tutor-xray-retrieval[hidden] { display: none !important; }
@keyframes tutorScan {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* Ambient (A) */
.tutor-ambient-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  padding: 10px 6px;
  gap: 8px;
}
.tutor-ambient-orb {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel2);
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 30%, transparent);
  transition: box-shadow 0.3s, transform 0.2s;
}
.tutor-ambient-orb:hover { transform: scale(1.06); }
.tutor-ambient-orb.is-active {
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 35%, transparent);
}
.tutor-ambient-rail-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--input-bg);
  color: var(--muted);
  cursor: pointer;
  display: grid;
  place-items: center;
}
.tutor-ambient-rail-btn.active { color: var(--accent); border-color: var(--accent); }
.tutor-ambient-expanded {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  width: 100%;
  overflow: hidden;
}
#chat-panel.is-expanded .tutor-ambient-expanded { display: flex; }
#chat-panel.is-expanded .tutor-ambient-rail-only { display: none; }
#chat-panel .tutor-ambient-expanded { display: flex; }
#chat-panel .tutor-ambient-rail-only { display: none; }
.tutor-ambient-rail-only {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.tutor-ambient-transcript {
  position: fixed;
  right: 64px;
  bottom: 16px;
  width: min(320px, calc(100vw - 80px));
  max-height: 40vh;
  overflow-y: auto;
  padding: 10px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  z-index: 45;
  font-size: 0.78rem;
}
#chat-panel.is-expanded .tutor-ambient-transcript { display: none; }
.tutor-ambient-transcript .chat-bubble { margin-bottom: 6px; padding: 6px 10px; font-size: 0.72rem; }

/* Signal skin accent for deck variant */
#chat-panel[data-tutor-skin="deck"] .tutor-hud {
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 8%, transparent), transparent);
}

#chat-panel[data-tutor-skin="xray"] {
  background: linear-gradient(180deg, #0c1020 0%, var(--sidebar-bg) 120px);
}
#chat-panel[data-tutor-skin="xray"] .tutor-xray-panel {
  border-color: rgba(99, 102, 241, 0.45);
  background: rgba(99, 102, 241, 0.08);
}

.tutor-skin-picker { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 8px; }
.tutor-skin-opt {
  text-align: left;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel2);
  cursor: pointer;
}
.tutor-skin-opt.active { border-color: var(--accent); background: var(--accent-soft); }
.tutor-skin-opt strong { display: block; font-size: 0.82rem; margin-bottom: 2px; }
.tutor-skin-opt span { font-size: 0.7rem; color: var(--muted); }

/* 语音输入 · 底部频谱条（问答模式输入区） */
.chat-voice-viz {
  width: 100%;
  height: 36px;
  margin-bottom: 6px;
  border-radius: 10px;
  overflow: hidden;
  background: color-mix(in srgb, var(--accent) 6%, var(--input-bg));
  border: 1px solid color-mix(in srgb, var(--accent) 18%, var(--line));
}
.chat-voice-viz[hidden] {
  display: none !important;
}
.chat-voice-viz canvas {
  width: 100%;
  height: 100%;
  display: block;
}
.chat-compose-icon.voice-in-holding {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 28%, transparent);
}

html.reduce-motion .tutor-xray-retrieval { animation: none; }

  @media (max-width: 1100px) {
  .app.tutor-ambient-layout { grid-template-columns: 200px minmax(0, 1fr); }
  #chat-panel[data-tutor-skin="ambient"] { width: min(340px, 92vw); min-width: 280px; }
  #chat-panel[data-tutor-skin="ambient"].is-expanded { width: min(340px, 92vw); min-width: 280px; }
}