:root {
  color-scheme: dark;
  --bg: #0c1117;
  --bg-soft: #111821;
  --panel: #151d27;
  --panel-strong: #1b2633;
  --panel-muted: #0f151d;
  --line: #2b3746;
  --line-soft: rgba(255, 255, 255, 0.08);
  --text: #eef5fb;
  --muted: #9baab9;
  --subtle: #758596;
  --teal: #29d3c3;
  --teal-deep: #119d95;
  --amber: #f7b955;
  --danger: #ef5f68;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 8px;
  --font: "Inter", "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  background:
    linear-gradient(135deg, rgba(41, 211, 195, 0.08), transparent 32%),
    linear-gradient(180deg, #0c1117 0%, #0f151d 100%);
  color: var(--text);
  font-family: var(--font);
}

button,
input {
  font: inherit;
}

button {
  border: 0;
}

svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.app-shell {
  width: min(1320px, calc(100vw - 40px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 28px 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0 24px;
}

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

.brand-mark,
.panel-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid rgba(41, 211, 195, 0.45);
  border-radius: 8px;
  background: rgba(41, 211, 195, 0.1);
  color: var(--teal);
}

.brand h1,
.panel-heading h2 {
  margin: 0;
  letter-spacing: 0;
}

.brand h1 {
  font-size: 24px;
  line-height: 1.2;
  font-weight: 760;
}

.brand p,
.panel-heading p,
.activity-bar p {
  margin: 4px 0 0;
  color: var(--muted);
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 24, 33, 0.78);
  color: var(--muted);
  font-size: 14px;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--amber);
  box-shadow: 0 0 16px rgba(247, 185, 85, 0.65);
}

.status-dot.online {
  background: var(--teal);
  box-shadow: 0 0 16px rgba(41, 211, 195, 0.7);
}

.status-dot.offline {
  background: var(--danger);
  box-shadow: 0 0 16px rgba(239, 95, 104, 0.65);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(340px, 430px) minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(21, 29, 39, 0.94);
  box-shadow: var(--shadow);
}

.panel-host {
  display: flex;
  min-height: 760px;
  flex-direction: column;
  padding: 20px;
}

.panel-viewer {
  display: flex;
  min-height: 760px;
  flex-direction: column;
  padding: 20px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  padding-bottom: 18px;
}

.panel-heading h2 {
  font-size: 18px;
  line-height: 1.25;
  font-weight: 730;
}

.panel-heading p {
  font-size: 14px;
  line-height: 1.5;
}

.panel-icon {
  width: 38px;
  height: 38px;
}

.panel-icon-alt {
  border-color: rgba(247, 185, 85, 0.42);
  background: rgba(247, 185, 85, 0.09);
  color: var(--amber);
}

.form-stack,
.join-grid {
  display: grid;
  gap: 12px;
}

.join-grid {
  grid-template-columns: minmax(140px, 1fr) minmax(140px, 1fr) auto;
  align-items: end;
}

label {
  display: grid;
  gap: 7px;
}

label span,
.meta-label,
dt {
  color: var(--subtle);
  font-size: 12px;
  font-weight: 680;
  line-height: 1.2;
}

input {
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  background: #0f151d;
  color: var(--text);
  padding: 0 12px;
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

input::placeholder {
  color: #627282;
}

input:focus {
  border-color: rgba(41, 211, 195, 0.8);
  box-shadow: 0 0 0 3px rgba(41, 211, 195, 0.12);
}

.primary-btn,
.accent-btn,
.danger-btn,
.secondary-btn,
.ghost-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 720;
  line-height: 1;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease, opacity 150ms ease;
}

.primary-btn {
  background: linear-gradient(180deg, #29d3c3, #16a9a0);
  color: #061112;
  padding: 0 18px;
}

.accent-btn {
  background: rgba(41, 211, 195, 0.13);
  border: 1px solid rgba(41, 211, 195, 0.45);
  color: var(--teal);
  padding: 0 16px;
}

.danger-btn {
  background: rgba(239, 95, 104, 0.13);
  border: 1px solid rgba(239, 95, 104, 0.45);
  color: #ff8d94;
  padding: 0 16px;
}

.secondary-btn {
  background: #111821;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 0 14px;
}

.ghost-icon {
  width: 42px;
  background: #111821;
  border: 1px solid var(--line);
  color: var(--muted);
}

button:not(:disabled):hover {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.room-card,
.viewer-meta,
.activity-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-muted);
}

.room-card {
  margin-top: 16px;
  padding: 14px;
}

.room-card strong {
  display: block;
  margin-top: 4px;
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0;
}

.host-actions {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-top: 14px;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0;
}

.stats-grid div {
  min-height: 76px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #111821;
  padding: 13px;
}

.stats-grid dd {
  margin: 9px 0 0;
  font-size: 22px;
  font-weight: 760;
}

.preview-shell,
.screen-stage {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 28%),
    #090d12;
}

.preview-shell {
  flex: 1;
  min-height: 230px;
}

.screen-stage {
  flex: 1;
  min-height: 560px;
  margin-top: 14px;
}

video {
  width: 100%;
  height: 100%;
  background: #05070a;
  object-fit: contain;
}

.video-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 12px;
  padding: 24px;
  color: var(--subtle);
  text-align: center;
}

.video-empty svg {
  width: 42px;
  height: 42px;
  color: var(--teal);
}

.stage-empty svg {
  color: var(--amber);
}

.viewer-meta {
  min-height: 58px;
  margin-top: 14px;
  padding: 10px 12px;
}

.viewer-meta strong {
  display: block;
  margin-top: 4px;
  color: var(--text);
  font-size: 15px;
}

.activity-bar {
  margin-top: 18px;
  padding: 14px 16px;
  background: rgba(15, 21, 29, 0.9);
}

.activity-bar p {
  font-size: 14px;
}

.is-hidden {
  display: none;
}

@media (max-width: 980px) {
  .app-shell {
    width: min(100% - 24px, 760px);
    padding: 18px 0;
  }

  .topbar,
  .workspace {
    display: grid;
  }

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

  .panel-host,
  .panel-viewer {
    min-height: auto;
  }

  .screen-stage {
    min-height: 420px;
  }
}

@media (max-width: 680px) {
  .topbar {
    gap: 14px;
  }

  .brand h1 {
    font-size: 21px;
  }

  .topbar-status {
    justify-content: center;
  }

  .join-grid,
  .host-actions,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .screen-stage {
    min-height: 300px;
  }

  .panel {
    padding: 16px;
  }
}