:root {
  color-scheme: light dark;
  --ui-bg: #f4f6f3;
  --ui-surface: rgba(255, 255, 255, 0.84);
  --ui-surface-solid: #ffffff;
  --ui-surface-soft: #eef2ef;
  --ui-ink: #122019;
  --ui-muted: #66726c;
  --ui-line: #d6ddd9;
  --ui-line-strong: #bdc9c3;
  --ui-accent: #176b4e;
  --ui-accent-strong: #0c4f38;
  --ui-accent-soft: #dfeee7;
  --ui-danger: #a23f3f;
  --ui-shadow: 0 18px 54px rgba(17, 31, 24, 0.08);
  --ui-shadow-soft: 0 8px 24px rgba(17, 31, 24, 0.055);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--ui-bg);
  color: var(--ui-ink);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ui-bg: #0b100e;
    --ui-surface: rgba(18, 26, 22, 0.9);
    --ui-surface-solid: #121a16;
    --ui-surface-soft: #16201b;
    --ui-ink: #edf3f0;
    --ui-muted: #9eaaa4;
    --ui-line: #2a3530;
    --ui-line-strong: #3b4942;
    --ui-accent: #78c7a9;
    --ui-accent-strong: #9bd9c0;
    --ui-accent-soft: #173027;
    --ui-danger: #e79090;
    --ui-shadow: none;
    --ui-shadow-soft: none;
  }
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--ui-bg); }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    radial-gradient(circle at 14% -10%, color-mix(in srgb, var(--ui-accent) 11%, transparent), transparent 34rem),
    var(--ui-bg);
  color: var(--ui-ink);
}
body:not(.explainer-page) main { width: min(100%, 1080px); margin: 0 auto; padding: 24px 28px 72px; }
a { color: var(--ui-accent); }
p { line-height: 1.55; }
h1, h2, h3 { color: var(--ui-ink); }
h1 {
  margin: 0 0 14px;
  max-width: 900px;
  font-size: clamp(2.15rem, 6vw, 3.8rem);
  line-height: .98;
  letter-spacing: -.045em;
}
h2 { margin: 0; font-size: clamp(1.25rem, 3vw, 1.65rem); letter-spacing: -.02em; }

body:not(.explainer-page) nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 54px;
  padding: 8px;
  border: 1px solid color-mix(in srgb, var(--ui-line) 85%, transparent);
  border-radius: 14px;
  background: color-mix(in srgb, var(--ui-bg) 78%, transparent);
  box-shadow: var(--ui-shadow-soft);
  backdrop-filter: blur(16px) saturate(1.2);
}
body:not(.explainer-page) nav a {
  padding: 8px 10px;
  border-radius: 9px;
  color: var(--ui-muted);
  font-size: .9rem;
  font-weight: 650;
  text-decoration: none;
}
body:not(.explainer-page) nav a:hover { background: var(--ui-surface-soft); color: var(--ui-ink); }

.lead {
  max-width: 780px;
  margin: 0 0 30px;
  color: var(--ui-muted);
  font-size: clamp(1rem, 2vw, 1.12rem);
}
.eyebrow {
  margin: 0 0 10px;
  color: var(--ui-accent);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.panel {
  border: 1px solid var(--ui-line);
  border-radius: 18px;
  padding: clamp(16px, 3vw, 22px);
  background: var(--ui-surface);
  box-shadow: var(--ui-shadow-soft);
  backdrop-filter: blur(14px);
}
.panel + .panel,
.panel + .game-shell,
.game-shell + .panel { margin-top: 18px; }
.lobby-panel { display: grid; gap: 16px; }
.lobby-panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}
.lobby-panel-heading p { margin: 5px 0 0; }
.lobby {
  display: grid;
  grid-template-columns: minmax(160px, .8fr) auto minmax(240px, 1fr) minmax(130px, auto);
  gap: 10px;
  align-items: end;
}
.lobby > span { align-self: center; color: var(--ui-muted); font-size: .88rem; }
label { display: grid; gap: 7px; color: var(--ui-muted); font-size: .85rem; font-weight: 700; }
input, select, button {
  min-height: 44px;
  border: 1px solid var(--ui-line-strong);
  border-radius: 10px;
  padding: 9px 12px;
  font: inherit;
  color: var(--ui-ink);
}
input, select { width: 100%; background: var(--ui-surface-solid); }
input::placeholder { color: color-mix(in srgb, var(--ui-muted) 76%, transparent); }
button {
  cursor: pointer;
  background: var(--ui-surface-solid);
  font-weight: 720;
  transition: transform .14s ease, border-color .14s ease, background .14s ease;
}
button:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--ui-accent); background: var(--ui-accent-soft); }
button:active:not(:disabled) { transform: translateY(0); }
button:disabled { cursor: not-allowed; opacity: .48; }
button.primary {
  border-color: var(--ui-accent);
  background: var(--ui-accent);
  color: var(--ui-bg);
}
button.primary:hover:not(:disabled) { background: var(--ui-accent-strong); color: var(--ui-bg); }
button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--ui-accent) 38%, transparent);
  outline-offset: 2px;
}

.status {
  min-height: 1.5em;
  margin: 0;
  color: var(--ui-ink);
}
.room-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .045em;
  font-weight: 750;
}
.muted { color: var(--ui-muted); }
.hidden { display: none !important; }

.lobby-meta {
  display: flex;
  gap: 10px 18px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--ui-muted);
  font-size: .9rem;
}
.latency-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 30px;
  padding: 5px 9px;
  border: 1px solid var(--ui-line);
  border-radius: 999px;
  background: var(--ui-surface-soft);
  color: var(--ui-muted);
  font-size: .8rem;
  font-weight: 750;
  white-space: nowrap;
}
.latency-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--ui-muted);
}
.latency-chip[data-quality="good"]::before { background: #3aa66d; }
.latency-chip[data-quality="fair"]::before { background: #d39b35; }
.latency-chip[data-quality="poor"]::before { background: var(--ui-danger); }

.invite-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--ui-line);
  border-radius: 12px;
  background: var(--ui-surface-soft);
}
.invite-code { display: grid; gap: 2px; min-width: max-content; }
.invite-code .muted { font-size: .72rem; font-weight: 750; text-transform: uppercase; letter-spacing: .08em; }
.invite-link {
  min-width: 0;
  overflow: hidden;
  color: var(--ui-muted);
  font: .78rem/1.35 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: none;
}
.invite-link:hover { color: var(--ui-accent); text-decoration: underline; }

.lobby-chat {
  overflow: hidden;
  border: 1px solid var(--ui-line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--ui-surface-solid) 74%, transparent);
}
.lobby-chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--ui-line);
}
.lobby-chat-head strong { font-size: .92rem; }
.chat-log {
  display: grid;
  align-content: end;
  gap: 8px;
  min-height: 82px;
  max-height: 180px;
  margin: 0;
  padding: 10px 12px;
  overflow-y: auto;
  list-style: none;
}
.chat-log:empty::before {
  content: "Chat stays peer to peer and appears here once someone sends a message.";
  align-self: center;
  color: var(--ui-muted);
  font-size: .84rem;
}
.chat-message { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 8px; align-items: baseline; }
.chat-message strong { color: var(--ui-accent); font-size: .78rem; }
.chat-message[data-local="true"] strong { color: var(--ui-muted); }
.chat-message span { min-width: 0; overflow-wrap: anywhere; font-size: .9rem; }
.chat-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--ui-line);
}
.chat-form input { min-height: 40px; }
.chat-form button { min-height: 40px; }

.game-shell {
  margin-top: 20px;
  border: 1px solid var(--ui-line);
  border-radius: 18px;
  padding: clamp(16px, 3vw, 22px);
  background: var(--ui-surface);
  box-shadow: var(--ui-shadow-soft);
}
.game-telemetry { display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }

@media (max-width: 760px) {
  body:not(.explainer-page) main { padding: 18px 16px 54px; }
  body:not(.explainer-page) nav { margin-bottom: 38px; }
  .lobby { grid-template-columns: 1fr 1fr; }
  .lobby > span { display: none; }
  .lobby label { grid-column: 1 / -1; }
  .invite-row { grid-template-columns: 1fr auto; }
  .invite-code { grid-column: 1 / 2; }
  .invite-link { grid-column: 1 / -1; grid-row: 2; }
}

@media (max-width: 480px) {
  .lobby { grid-template-columns: 1fr; }
  .lobby label { grid-column: auto; }
  .lobby-panel-heading { align-items: stretch; flex-direction: column; }
  .invite-row { grid-template-columns: 1fr; }
  .invite-code, .invite-link { grid-column: auto; grid-row: auto; }
  .chat-form { grid-template-columns: 1fr; }
}