:root {
  --bg: #0b1116;
  --panel: #121a22;
  --panel-strong: #18222d;
  --line: rgba(255, 255, 255, 0.08);
  --muted: #9daab6;
  --text: #f4efe6;
  --shadow: 0 20px 80px rgba(0, 0, 0, 0.35);
}

body[data-page="websocket"] {
  --accent: #ff9a5a;
  --accent-soft: rgba(255, 154, 90, 0.18);
}

body[data-page="sse"] {
  --accent: #3dd3c7;
  --accent-soft: rgba(61, 211, 199, 0.18);
}

body[data-page="webrtc"] {
  --accent: #ff6f7f;
  --accent-soft: rgba(255, 111, 127, 0.18);
}

body[data-page="webtransport"] {
  --accent: #d7ff61;
  --accent-soft: rgba(215, 255, 97, 0.18);
}

body[data-page="use-cases"] {
  --accent: #8fc5ff;
  --accent-soft: rgba(143, 197, 255, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.08), transparent 28%),
    radial-gradient(circle at top right, var(--accent-soft), transparent 32%),
    linear-gradient(180deg, #101922 0%, #0b1116 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
}

a {
  color: inherit;
}

.shell {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px;
}

.card {
  background: linear-gradient(180deg, rgba(24, 34, 45, 0.92), rgba(15, 22, 29, 0.94));
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.8fr);
  padding: 24px;
  animation: fade-up 500ms ease both;
}

.hero-copy {
  display: grid;
  gap: 18px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", serif;
  font-weight: 600;
}

h1 {
  font-size: clamp(2.8rem, 5vw, 4.8rem);
  line-height: 0.95;
}

.lede {
  max-width: 54rem;
  margin: 0;
  color: #dce3ea;
  font-size: 1.08rem;
  line-height: 1.65;
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.fact {
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  color: #edf4fa;
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.92rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  color: var(--muted);
  transition: 160ms ease;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.hero-note {
  display: grid;
  gap: 14px;
  padding: 18px;
  align-self: stretch;
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.05), transparent 65%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.hero-note p,
.hero-note li {
  color: #d8e1e7;
  line-height: 1.6;
}

.list {
  margin: 0;
  padding-left: 18px;
}

.stage {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.7fr);
  margin-top: 22px;
}

.main-panel,
.side-panel,
.use-case-card {
  padding: 22px;
  animation: fade-up 560ms ease both;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 18px;
}

.subhead {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.status-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.status-pill {
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  min-width: 120px;
}

.status-label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-value {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.92rem;
}

.messages,
.notification-list {
  display: grid;
  gap: 12px;
  min-height: 380px;
  max-height: 55vh;
  padding: 4px;
  overflow: auto;
}

.bubble,
.notification-card {
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.bubble.mine {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.bubble.system {
  background: rgba(255, 255, 255, 0.03);
  color: #d6dee4;
}

.bubble-head,
.notification-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.bubble-name,
.notification-title {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.bubble.system .bubble-name {
  color: #d9e1e8;
}

.bubble-time,
.notification-time {
  color: var(--muted);
  font-size: 0.8rem;
}

.bubble-text,
.notification-body {
  margin: 0;
  line-height: 1.65;
}

.composer,
.stack-form {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.composer {
  grid-template-columns: 210px minmax(0, 1fr) auto;
  align-items: end;
}

.stack-form {
  grid-template-columns: 1fr;
}

.field {
  display: grid;
  gap: 8px;
}

.field span,
.card-label {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

input,
textarea,
button {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  font: inherit;
}

input,
textarea {
  padding: 14px 16px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

button {
  padding: 14px 18px;
  cursor: pointer;
  color: #071015;
  background: var(--accent);
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 30px var(--accent-soft);
}

button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
  box-shadow: none;
}

.side-panel {
  display: grid;
  gap: 20px;
}

.user-list,
.peer-list,
.video-grid {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.user-list li,
.peer-list li,
.video-tile {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.code-note {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px dashed rgba(255, 255, 255, 0.16);
  color: #dce5eb;
  background: rgba(255, 255, 255, 0.03);
  line-height: 1.7;
}

.code-note code {
  font-family: "SF Mono", "Menlo", monospace;
  color: var(--accent);
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.card-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.tiny {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.video-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

video {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #050709;
  object-fit: cover;
}

.telemetry-pad {
  position: relative;
  min-height: 260px;
  border-radius: 22px;
  border: 1px solid var(--line);
  overflow: hidden;
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.08), transparent 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.telemetry-pad::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

.cursor-dot {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 20px currentColor;
}

.cursor-label {
  position: absolute;
  transform: translate(-50%, calc(-50% - 24px));
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(7, 11, 15, 0.78);
  color: white;
  font-size: 0.78rem;
  white-space: nowrap;
}

.tone-info {
  border-color: rgba(143, 197, 255, 0.26);
}

.tone-success {
  border-color: rgba(138, 255, 175, 0.28);
}

.tone-warning {
  border-color: rgba(255, 212, 120, 0.28);
}

.empty {
  color: var(--muted);
  font-style: italic;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero,
  .stage,
  .use-case-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .shell {
    padding: 16px;
  }

  .hero,
  .main-panel,
  .side-panel,
  .use-case-card {
    padding: 18px;
    border-radius: 22px;
  }

  h1 {
    font-size: 2.5rem;
  }
}