:root {
  color-scheme: dark;
  --bg: #06070b;
  --panel: rgba(19, 24, 34, 0.76);
  --line: rgba(255, 255, 255, 0.09);
  --text: #f5f7fb;
  --muted: rgba(228, 234, 246, 0.68);
  --success: #9ef3c0;
  --shadow: 0 36px 120px rgba(0, 0, 0, 0.35);
  --radius-xl: 34px;
  --radius-lg: 24px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(123, 170, 255, 0.22), transparent 32%),
    radial-gradient(circle at 78% 20%, rgba(110, 220, 212, 0.18), transparent 34%),
    linear-gradient(180deg, #090a10 0%, #05060a 52%, #040508 100%);
  color: var(--text);
}

body {
  min-height: 100vh;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

input[type="color"] {
  padding: 0;
  inline-size: 48px;
  block-size: 44px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: transparent;
}

.app-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  padding: 24px;
}

.bg-glow {
  position: absolute;
  inline-size: 34rem;
  block-size: 34rem;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.32;
  pointer-events: none;
}

.bg-glow-left {
  top: -8rem;
  left: -10rem;
  background: linear-gradient(135deg, rgba(93, 146, 255, 0.45), rgba(255, 255, 255, 0));
}

.bg-glow-right {
  right: -12rem;
  bottom: -14rem;
  background: linear-gradient(135deg, rgba(112, 255, 228, 0.42), rgba(255, 255, 255, 0));
}

.topbar,
.stage-card,
.panel,
.join-card,
.control-dock,
.status-pill,
.room-pill,
.ghost-button,
.primary-button,
.control-button {
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

.topbar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 16px 28px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  inline-size: 18px;
  block-size: 18px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.22)),
    linear-gradient(180deg, #89c8ff, #4b8dff);
  box-shadow:
    0 0 0 6px rgba(255, 255, 255, 0.05),
    0 16px 30px rgba(87, 141, 255, 0.45);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(225, 232, 246, 0.55);
}

.topbar h1,
.stage-head h2,
.panel h3,
.join-card h2 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.04em;
}

.topbar h1 {
  font-size: 1.2rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-pill,
.room-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.room-pill {
  min-block-size: 38px;
  font-size: 0.9rem;
  color: rgba(245, 247, 251, 0.86);
}

.ghost-button,
.primary-button,
.control-button {
  min-block-size: 46px;
  padding: 0 18px;
  border-radius: 999px;
  transition:
    transform 180ms var(--ease),
    background 180ms var(--ease),
    border-color 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.ghost-button,
.control-button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.primary-button {
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #08111c;
  font-weight: 600;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(228, 240, 255, 0.92)),
    linear-gradient(135deg, rgba(128, 171, 255, 0.72), rgba(170, 255, 237, 0.72));
  box-shadow: 0 20px 50px rgba(255, 255, 255, 0.16);
}

.ghost-button:hover,
.primary-button:hover,
.control-button:hover {
  transform: translateY(-1px);
}

.wide-button {
  inline-size: 100%;
}

.flex-button {
  flex: 1;
}

.layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.75fr) minmax(320px, 0.88fr);
  gap: 20px;
  min-height: calc(100vh - 108px);
}

.stage-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.stage-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding-inline: 8px;
}

.title-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.stage-head h2 {
  max-width: 50rem;
  font-size: clamp(1.6rem, 2vw + 1rem, 2.5rem);
  line-height: 1;
}

.stage-meta,
.join-copy {
  margin: 10px 0 0;
  max-width: 56rem;
  color: var(--muted);
  line-height: 1.55;
}

.presence-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.presence-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
}

.presence-chip strong {
  max-inline-size: 11rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.presence-chip small {
  font-size: 0.75rem;
  color: rgba(245, 247, 251, 0.74);
}

.presence-chip span {
  inline-size: 10px;
  block-size: 10px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 18px rgba(158, 243, 192, 0.68);
}

.presence-chip.is-loading span,
.participant-badge.is-loading {
  background: #9dd5ff;
  box-shadow: 0 0 18px rgba(157, 213, 255, 0.55);
}

.presence-chip.is-error span,
.participant-badge.is-error {
  background: #ff8585;
  box-shadow: 0 0 18px rgba(255, 133, 133, 0.55);
}

.presence-chip.is-idle span,
.participant-badge.is-idle {
  background: rgba(255, 255, 255, 0.34);
  box-shadow: none;
}

.participant-badge.is-error,
.participant-badge.is-idle {
  color: var(--text);
}

.stage-card {
  position: relative;
  display: grid;
  place-items: center;
  min-height: min(72vh, 860px);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at top, rgba(133, 169, 255, 0.18), transparent 30%),
    linear-gradient(180deg, rgba(15, 18, 25, 0.98), rgba(7, 9, 14, 0.96));
  box-shadow: var(--shadow);
}

#player,
#youtubePlayerHost,
#drawCanvas,
.danmaku-layer,
.empty-state,
.pause-overlay,
.fullscreen-hud {
  position: absolute;
  inset: 0;
}

#player,
.youtube-player-shell {
  inline-size: 100%;
  block-size: 100%;
  z-index: 0;
  background: #000;
}

#player {
  object-fit: contain;
}

.youtube-player-shell iframe {
  inline-size: 100%;
  block-size: 100%;
  border: 0;
}

#drawCanvas {
  z-index: 3;
  touch-action: none;
  pointer-events: none;
}

#drawCanvas.is-drawing {
  pointer-events: auto;
  cursor: crosshair;
}

.danmaku-layer {
  z-index: 2;
  overflow: hidden;
  pointer-events: none;
}

.danmaku-item {
  position: absolute;
  left: 100%;
  max-inline-size: min(40vw, 28rem);
  font-size: clamp(1rem, 0.8rem + 0.8vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-shadow:
    0 2px 10px rgba(0, 0, 0, 0.75),
    0 0 1px rgba(0, 0, 0, 1);
  white-space: nowrap;
  animation: danmaku-move var(--duration, 9000ms) linear forwards;
}

.empty-state {
  z-index: 1;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  background: none;
}

.empty-state h3 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  letter-spacing: -0.05em;
}

.empty-state p:last-child {
  margin: 12px 0 0;
  max-width: 30rem;
  color: var(--muted);
  line-height: 1.6;
}

.pause-overlay {
  z-index: 4;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 24px;
  background: none;
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms var(--ease);
}

.fullscreen-hud {
  z-index: 6;
  display: none;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms var(--ease);
}

.fullscreen-hud.is-visible {
  opacity: 1;
}

.fullscreen-hud-top,
.fullscreen-hud-bottom {
  display: flex;
  gap: 14px;
  pointer-events: auto;
}

.fullscreen-hud-top {
  justify-content: flex-end;
}

.fullscreen-hud-bottom {
  flex-direction: column;
}

.fullscreen-control-dock,
.fullscreen-tool-dock,
.fullscreen-inline-form,
.fullscreen-ink-panel {
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

.fullscreen-control-dock,
.fullscreen-tool-dock {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 14, 20, 0.62);
  box-shadow: 0 24px 90px rgba(0, 0, 0, 0.34);
}

.fullscreen-control-dock {
  display: grid;
  grid-template-columns: auto auto auto minmax(180px, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border-radius: 999px;
}

.fullscreen-tool-dock {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto;
  gap: 12px;
  padding: 14px;
  border-radius: 26px;
}

.fullscreen-inline-form,
.fullscreen-ink-panel {
  display: flex;
  align-items: center;
  gap: 12px;
}

.fullscreen-inline-form input[type="text"],
.fullscreen-inline-form input:not([type]),
.fullscreen-inline-form input[type="search"],
.fullscreen-inline-form input[type="url"],
.fullscreen-inline-form input[type="email"],
.fullscreen-inline-form input[type="tel"],
.fullscreen-inline-form input[type="password"],
.fullscreen-inline-form input[type="number"],
#fullscreenDanmakuInput {
  min-inline-size: 0;
  flex: 1;
  min-block-size: 48px;
  padding: 0 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  outline: none;
}

#fullscreenDanmakuInput::placeholder {
  color: rgba(225, 232, 246, 0.34);
}

#fullscreenDanmakuInput:focus {
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: 0 0 0 6px rgba(157, 213, 255, 0.08);
}

.fullscreen-tool-field {
  display: grid;
  gap: 6px;
  color: rgba(245, 247, 251, 0.82);
  font-size: 0.78rem;
}

.fullscreen-range-field {
  min-inline-size: 140px;
}

.fullscreen-range-field input {
  inline-size: 100%;
}

#fullscreenProgressBar {
  inline-size: 100%;
  accent-color: #ffffff;
}

#videoStage:fullscreen .fullscreen-hud,
body.is-mobile-fullscreen .fullscreen-hud {
  display: flex;
}

#videoStage:fullscreen {
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: #000;
}

body.is-mobile-fullscreen {
  overflow: hidden;
}

.stage-panel.is-mobile-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 70;
  padding: 0;
  margin: 0;
  gap: 0;
  background: #000;
}

body.is-mobile-fullscreen .topbar,
body.is-mobile-fullscreen .sidebar,
body.is-mobile-fullscreen .stage-panel.is-mobile-fullscreen .stage-head {
  display: none;
}

.stage-panel.is-mobile-fullscreen .stage-card {
  min-height: 100vh;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: #000;
}

body.is-mobile-fullscreen .stage-panel.is-mobile-fullscreen .control-dock {
  display: none;
}

.pause-overlay.is-visible {
  opacity: 1;
}

.control-dock {
  display: grid;
  grid-template-columns: auto auto auto minmax(120px, 1fr) auto auto auto auto;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(14, 18, 25, 0.82);
}

#progressBar {
  inline-size: 100%;
  accent-color: #ffffff;
}

.time-readout {
  min-inline-size: 9rem;
  text-align: center;
  color: rgba(245, 247, 251, 0.82);
  font-variant-numeric: tabular-nums;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  padding: 18px;
  box-shadow: var(--shadow);
}

.panel-head {
  margin-bottom: 16px;
}

.panel h3 {
  font-size: 1.25rem;
}

.stack-form {
  display: grid;
  gap: 14px;
}

.compact-form {
  margin-top: 16px;
}

.field,
.tool-field {
  display: grid;
  gap: 8px;
}

.field span,
.tool-field span {
  font-size: 0.84rem;
  color: rgba(245, 247, 251, 0.78);
}

.field input,
.tool-row,
.participant-card,
.feed-item {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.field input {
  min-block-size: 50px;
  padding: 0 16px;
  color: var(--text);
  border-radius: 16px;
  outline: none;
}

.field input::placeholder {
  color: rgba(225, 232, 246, 0.34);
}

.field input:focus {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 0 6px rgba(157, 213, 255, 0.08);
}

.participant-list,
.feed {
  display: grid;
  gap: 12px;
}

.participant-card,
.feed-item {
  padding: 14px 16px;
  border-radius: 18px;
}

.participant-card strong,
.feed-item strong {
  display: block;
  margin-bottom: 6px;
}

.participant-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 28px;
  inline-size: fit-content;
  margin-bottom: 10px;
  padding: 0 12px;
  border-radius: 999px;
  color: #08111c;
  font-size: 0.76rem;
  font-weight: 700;
  background: var(--success);
}

.participant-card p,
.feed-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.tool-row {
  display: flex;
  align-items: end;
  gap: 12px;
  padding: 12px;
  border-radius: 18px;
}

.range-field {
  flex: 1;
}

.range-field input {
  inline-size: 100%;
}

.join-sheet {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(4, 6, 10, 0.62);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition:
    opacity 220ms var(--ease),
    visibility 220ms var(--ease);
}

.join-sheet.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.join-card {
  inline-size: min(34rem, 100%);
  padding: 28px;
  border-radius: calc(var(--radius-xl) + 4px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  background:
    radial-gradient(circle at top, rgba(138, 177, 255, 0.18), transparent 32%),
    linear-gradient(180deg, rgba(16, 21, 31, 0.96), rgba(10, 13, 20, 0.94));
  box-shadow: 0 40px 140px rgba(0, 0, 0, 0.45);
}

.join-card h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.toast-stack {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 30;
  display: grid;
  gap: 12px;
}

.toast {
  min-inline-size: 18rem;
  max-inline-size: 26rem;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(19, 24, 34, 0.88);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.32);
  animation: toast-in 220ms var(--ease);
}

@media (max-width: 980px) {
  .fullscreen-hud {
    padding: 16px;
  }

  .fullscreen-control-dock {
    grid-template-columns: repeat(3, auto) minmax(120px, 1fr) auto;
  }

  .fullscreen-control-dock #fullscreenSyncButton {
    grid-column: span 2;
  }

  .fullscreen-tool-dock {
    grid-template-columns: 1fr;
  }

  .fullscreen-ink-panel {
    flex-wrap: wrap;
  }

  .fullscreen-range-field {
    min-inline-size: 0;
    flex: 1;
  }
}

@media (max-width: 720px) {
  .fullscreen-control-dock {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-radius: 28px;
  }

  .fullscreen-control-dock > * {
    min-width: 0;
  }

  #fullscreenProgressBar,
  #fullscreenTimeReadout {
    grid-column: 1 / -1;
  }

  .fullscreen-inline-form,
  .fullscreen-ink-panel {
    flex-wrap: wrap;
  }

  .fullscreen-inline-form button,
  .fullscreen-ink-panel button {
    inline-size: 100%;
  }

  .fullscreen-inline-form input[type="color"] {
    inline-size: 52px;
  }
}

.toast p {
  margin: 0;
  color: var(--text);
}

.toast.error {
  border-color: rgba(255, 120, 120, 0.28);
}

@keyframes danmaku-move {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(calc(-100vw - 24rem));
  }
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: -1;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 880px) {
  .app-shell {
    padding: 16px;
  }

  .topbar,
  .stage-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .presence-row {
    justify-content: flex-start;
  }

  .control-dock {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-radius: 28px;
  }

  #progressBar,
  .time-readout {
    grid-column: 1 / -1;
  }

  .sidebar {
    grid-template-columns: 1fr;
  }

  .stage-card {
    min-height: 52vh;
  }
}

@media (max-width: 560px) {
  .control-dock {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ghost-button,
  .primary-button,
  .control-button,
  .status-pill,
  .room-pill {
    min-block-size: 42px;
  }

  .toast-stack {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }

  .toast {
    min-inline-size: auto;
    max-inline-size: none;
  }
}