/* Visual language follows spherechain.space: near-black navy, SphereChain red,
   mono "eyebrow" labels, hairline-bordered cards and pill buttons. */
:root {
  --background: oklch(12% .01 260);
  --background-deep: oklch(9% .008 260);
  --card: oklch(16% .01 260);
  --muted: oklch(22% .01 260);
  --text: oklch(95% .005 260);
  --text-strong: #fff;
  --muted-foreground: oklch(60% .01 260);
  --border: oklch(100% 0 0 / .1);
  --input: oklch(100% 0 0 / .12);
  --red: oklch(57.7% .245 27.325);
  --red-bright: oklch(63.7% .237 25.331);
  --red-soft: oklch(70.4% .191 22.216);
  --red-deep: oklch(25.8% .092 26.042);
  --logo-red: #fb2c36;
  --tagline: #8f6a6d;
  --linkusd-cyan: #7ee8f2;
  --linkusd-violet: #b79cf5;
  --ok: oklch(76.5% .177 163.223);
  --warn: oklch(82.8% .189 84.429);
  --radius: .625rem;
  --font-sans: ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font: 15px/1.5 var(--font-sans);
  background: var(--background);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

h1, h2 { color: var(--text-strong); font-weight: 700; letter-spacing: -.02em; margin: 0; }
.accent { color: var(--red); }
.muted { color: var(--muted-foreground); }
.small { font-size: 13px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--red-bright);
  margin: 22px 0 10px;
}
.eyebrow.wide { letter-spacing: .35em; font-size: 12px; }

/* form controls */
input, textarea, button { font: inherit; color: inherit; }
input, textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--input);
  border-radius: var(--radius);
  background: oklch(100% 0 0 / .04);
  transition: border-color .15s, box-shadow .15s;
}
input::placeholder, textarea::placeholder { color: var(--muted-foreground); }
input:focus, textarea:focus { outline: none; border-color: var(--red); box-shadow: 0 0 0 3px oklch(57.7% .245 27.325 / .25); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, box-shadow .15s, transform .1s;
}
.btn:hover { background: var(--red-bright); box-shadow: 0 0 24px oklch(57.7% .245 27.325 / .35); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible, .link:focus-visible, .group:focus-visible { outline: 2px solid var(--red-soft); outline-offset: 2px; }
.btn.ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn.ghost:hover { border-color: oklch(57.7% .245 27.325 / .6); background: oklch(57.7% .245 27.325 / .08); box-shadow: none; }
.btn.danger { background: transparent; border-color: oklch(57.7% .245 27.325 / .5); color: var(--red-soft); width: 100%; margin-top: 18px; }
.btn.danger:hover { background: var(--red-deep); box-shadow: none; }
.small-btn { padding: 6px 14px; font-size: 13px; margin-top: 14px; }
.link { background: none; border: 0; padding: 2px 0; color: var(--red-soft); cursor: pointer; font-size: 13px; }
.link:hover { color: var(--text-strong); }
.link.danger { color: var(--red-bright); }
.stack { display: flex; flex-direction: column; gap: 10px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: calc(var(--radius) + 4px); padding: 16px; }
.card .eyebrow:first-child { margin-top: 0; }

/* OrbiSphere wordmark: light weight, as in the brand mark. */
.wordmark { font-weight: 300; letter-spacing: -.01em; color: var(--text-strong); }
.wordmark .accent { color: var(--logo-red); }
.tagline { color: var(--tagline); font-weight: 300; text-wrap: balance; }
.lead, .sub, .empty p { text-wrap: balance; }

/* ------------------------------------------------ landing / setup */
.hero {
  position: relative;
  min-height: 100%;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 38% 22%, rgb(251 44 54 / .14), transparent 32%),
    radial-gradient(circle at 62% 22%, rgb(126 92 220 / .16), transparent 32%),
    radial-gradient(ellipse at center, #0c0304 0 40%, #030102 85%);
  padding: 48px 16px;
}
.rain { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .3; }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 45% at center, rgb(0 0 0 / .78), transparent 75%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 760px; text-align: center; }
.hero h1 { font-size: clamp(44px, 8vw, 80px); line-height: 1.05; margin: 10px 0 14px; }
.hero .tagline { font-size: clamp(17px, 2.4vw, 22px); max-width: 560px; margin: 0 auto 8px; }
.pair { display: flex; align-items: center; justify-content: center; }
.mark { width: clamp(96px, 16vw, 152px); height: auto; border-radius: 999px; }
.mark.sphere { box-shadow: 0 0 0 1px rgb(183 156 245 / .3), 0 0 44px rgb(126 232 242 / .28); }
/* The bond between the two marks: OrbiSphere red flowing into LinkUSD cyan/violet. */
.bond {
  position: relative;
  width: clamp(48px, 12vw, 120px);
  height: 2px;
  margin: 0 -6px;
  background: linear-gradient(90deg, var(--logo-red), var(--linkusd-violet) 55%, var(--linkusd-cyan));
  box-shadow: 0 0 12px rgb(183 156 245 / .5);
}
.pulse {
  position: absolute;
  top: 50%;
  left: 0;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 0 10px #fff, 0 0 18px var(--linkusd-cyan);
  animation: travel 3.2s ease-in-out infinite alternate;
}
@keyframes travel { from { left: 0; } to { left: calc(100% - 8px); } }
.duo {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .35em;
  text-transform: uppercase;
  margin: 26px 0 0;
}
.duo-orbi { color: var(--logo-red); }
.duo-x { color: var(--muted-foreground); }
.duo-link { color: var(--linkusd-cyan); }
.dedication {
  margin: 34px auto 0;
  max-width: 460px;
  font-size: 13px;
  font-style: italic;
  font-weight: 300;
  color: var(--tagline);
  text-wrap: balance;
}
.dedication::before {
  content: "";
  display: block;
  width: 64px;
  height: 1px;
  margin: 0 auto 14px;
  background: linear-gradient(90deg, var(--logo-red), var(--linkusd-cyan));
  opacity: .6;
}
.link-word {
  background: linear-gradient(90deg, var(--linkusd-cyan), var(--linkusd-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--text); margin: 0 auto 14px; max-width: 640px; }
.hero .sub { color: var(--muted-foreground); max-width: 560px; margin: 0 auto 30px; }
.pill-form { display: flex; gap: 10px; max-width: 480px; margin: 0 auto; }
.pill-form input { border-radius: 999px; padding: 12px 20px; background: oklch(100% 0 0 / .06); }
.pill-form .btn { padding: 12px 24px; }
.fine { font-size: 12px; color: var(--muted-foreground); margin-top: 18px; }

/* ------------------------------------------------ app layout */
.app { display: grid; grid-template-columns: 300px 1fr auto; height: 100%; }
.sidebar, .members {
  background: var(--background-deep);
  border-right: 1px solid var(--border);
  padding: 18px;
  overflow-y: auto;
}
.members { width: 340px; border-right: 0; border-left: 1px solid var(--border); }
.me { display: flex; align-items: center; gap: 10px; }
.me-text { flex: 1; min-width: 0; }
.brand { font-size: 17px; }
.status {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted-foreground);
}
.status.ok { color: var(--ok); border-color: oklch(76.5% .177 163.223 / .35); background: oklch(76.5% .177 163.223 / .08); }

.group-list, .member-list, .messages { list-style: none; margin: 0; padding: 0; }
.group-list { display: flex; flex-direction: column; gap: 4px; margin-bottom: 18px; }
.group {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
}
.group:hover { background: var(--card); }
.group.active { background: var(--red-deep); border-color: oklch(57.7% .245 27.325 / .4); }
.group-text { display: flex; flex-direction: column; min-width: 0; }
.group-name { font-weight: 600; color: var(--text-strong); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.group-meta { font-family: var(--font-mono); font-size: 11px; color: var(--muted-foreground); }

.avatar {
  flex: none;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: var(--red-deep);
  border: 1px solid oklch(57.7% .245 27.325 / .45);
  color: var(--red-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

/* ------------------------------------------------ chat */
.chat { display: flex; min-width: 0; background: var(--background); }
.empty { margin: auto; padding: 24px; text-align: center; max-width: 440px; }
.empty .tagline { margin: 10px 0 0; }
.empty h2 { font-size: 28px; margin-bottom: 10px; }
.chat-view { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--background-deep);
}
.chat-header h2 { font-size: 19px; margin-bottom: 4px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}
.dot { width: 7px; height: 7px; border-radius: 99px; background: var(--red); box-shadow: 0 0 10px var(--red); }

.messages { flex: 1; overflow-y: auto; padding: 22px; display: flex; flex-direction: column; gap: 12px; }
.msg {
  max-width: min(640px, 85%);
  align-self: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px 14px 14px 4px;
  padding: 9px 14px;
}
.msg.mine {
  align-self: flex-end;
  background: var(--red-deep);
  border-color: oklch(57.7% .245 27.325 / .4);
  border-radius: 14px 14px 4px 14px;
}
.msg.bad { border-style: dashed; border-color: var(--red); color: var(--red-soft); font-style: italic; }
.msg .meta { display: flex; gap: 10px; align-items: baseline; font-size: 11px; color: var(--muted-foreground); margin-bottom: 2px; }
.msg .sender { font-weight: 700; font-size: 12px; color: var(--red-soft); }
.msg.mine .sender { color: var(--text-strong); }
.msg time { font-family: var(--font-mono); }
.msg .body { white-space: pre-wrap; overflow-wrap: anywhere; color: var(--text); }

.compose {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 14px 22px;
  border-top: 1px solid var(--border);
  background: var(--background-deep);
}
.compose textarea { resize: none; border-radius: 22px; padding: 11px 18px; min-height: 44px; max-height: 160px; }
.compose .btn { height: 44px; }

/* ------------------------------------------------ members */
.member { display: flex; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.member-info { flex: 1; min-width: 0; }
.member strong { color: var(--text-strong); }
.member .actions { display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 4px; }
.member-list { margin-bottom: 18px; }
.badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-left: 6px;
  padding: 1px 7px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted-foreground);
}
.badge.ok { color: var(--ok); border-color: oklch(76.5% .177 163.223 / .35); }
.badge.warn { color: var(--warn); border-color: oklch(82.8% .189 84.429 / .35); }

/* ------------------------------------------------ dialog + toasts */
dialog {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  color: var(--text);
  padding: 24px;
  max-width: min(460px, calc(100% - 32px));
}
dialog .eyebrow { margin-top: 0; }
dialog h2 { font-size: 20px; margin-bottom: 8px; }
dialog::backdrop { background: rgb(0 0 0 / .65); backdrop-filter: blur(4px); }
.safety {
  display: block;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.7;
  word-spacing: .35em;
  color: var(--text-strong);
  background: var(--background-deep);
  border: 1px solid oklch(57.7% .245 27.325 / .35);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 14px 0 18px;
}

.toasts { position: fixed; top: 16px; right: 16px; left: 16px; display: flex; flex-direction: column; align-items: flex-end; gap: 8px; pointer-events: none; z-index: 10; }
.toast {
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--red);
  border-radius: var(--radius);
  padding: 10px 14px;
  box-shadow: 0 10px 30px rgb(0 0 0 / .5);
}
.toast.warn { border-left-color: var(--warn); }
.toast.error { border-left-color: var(--red-bright); background: var(--red-deep); }

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; height: auto; min-height: 100%; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .chat-view { height: 78vh; }
  .members { width: auto; border-left: 0; border-top: 1px solid var(--border); }
  .pill-form { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .pulse { animation: none; left: calc(50% - 4px); }
}