:root {
  --bg: #0b141a;
  --chat-bg: #0b141a;
  --chat-pattern: #111b21;
  --panel: #202c33;
  --panel2: #2a3942;
  --border: #222d34;
  --text: #e9edef;
  --muted: #8696a0;
  --subtle: #667781;

  --accent: #00a884;           /* wa green */
  --accent-dim: #06cf9c;
  --bubble-self: #005c4b;       /* dark green for me */
  --bubble-other: #202c33;      /* dark gray for others */
  --bubble-grok: #3b2e5e;       /* purple tint for grok */
  --bubble-grok-border: #5a4691;
  --tick: #53bdeb;
  --system-bg: #182229;

  --radius: 7px;
  --radius-lg: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.45);
  --header-h: 59px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%;
  background: var(--bg); color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}
body {
  display: flex;
  align-items: stretch;
  justify-content: center;
}
.muted { color: var(--muted); }

.screen {
  width: 100%;
  max-width: 1000px;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--chat-bg);
}
[hidden] { display: none !important; }

/* -------- join screen -------- */
#join {
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(1000px 500px at 50% -10%, rgba(0,168,132,.12), transparent),
    var(--bg);
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}
.card h1 {
  margin: 0 0 4px;
  font-size: 26px;
  letter-spacing: -0.02em;
  color: var(--accent);
}
.card p { margin: 0 0 20px; font-size: 13.5px; line-height: 1.55; color: var(--muted); }
.card label {
  font-size: 11px;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.card input {
  width: 100%;
  padding: 12px 14px;
  background: var(--panel2);
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 14px;
  outline: none;
  transition: border-color .15s, background .15s;
}
.card input:focus { border-color: var(--accent); background: #1f2a30; }
.card button {
  width: 100%;
  padding: 12px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
  transition: filter .15s, transform .05s;
}
.card button:hover { filter: brightness(1.08); }
.card button:active { transform: translateY(1px); }
.card .hint { font-size: 11px; margin-top: 4px; }

/* -------- chat header -------- */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid rgba(0,0,0,.25);
  gap: 12px;
  height: var(--header-h);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}
.head-left, .head-right {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00a884, #00735d);
  color: #fff;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}
.head-info { min-width: 0; }
.title {
  font-weight: 500;
  font-size: 16px;
  letter-spacing: -0.005em;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.meta {
  font-size: 12.5px;
  color: var(--muted);
  max-width: 55vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.icon-btn {
  background: transparent;
  color: var(--muted);
  border: 0;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  cursor: pointer;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background .15s, color .15s;
}
.icon-btn:hover {
  background: rgba(255,255,255,.07);
  color: var(--text);
}
.conn {
  font-size: 9px;
  color: var(--accent);
  line-height: 1;
}
.conn.bad { color: #ef4444; }
.conn.warn { color: #facc15; }

/* -------- command bar -------- */
#cmdbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: #151e24;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.cmd {
  background: var(--panel2);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 5px;
  font-family: monospace;
  font-size: 11.5px;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: background .15s;
  user-select: none;
}
.cmd:hover { background: #2e3d47; }
.cmddesc { color: var(--muted); font-size: 11.5px; }
.cmdsep { color: var(--border); }

/* -------- messages -------- */
#messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px 5% 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background-color: var(--chat-pattern);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.015) 0, transparent 40%),
    radial-gradient(circle at 80% 60%, rgba(255,255,255,.015) 0, transparent 40%);
  scrollbar-width: thin;
  scrollbar-color: #374248 transparent;
}
#messages::-webkit-scrollbar { width: 8px; }
#messages::-webkit-scrollbar-thumb { background: #374248; border-radius: 4px; }
#messages::-webkit-scrollbar-thumb:hover { background: #495760; }

.msg {
  display: flex;
  flex-direction: column;
  max-width: 65%;
  animation: pop .12s ease-out;
  position: relative;
}
@keyframes pop {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: none; }
}

.msg .bubble {
  background: var(--bubble-other);
  border-radius: var(--radius-lg);
  padding: 6px 9px 8px 12px;
  line-height: 1.35;
  font-size: 14.2px;
  word-wrap: break-word;
  overflow-wrap: anywhere;
  box-shadow: 0 1px 0.5px rgba(0,0,0,.13);
  position: relative;
}
.msg .bubble .text {
  white-space: pre-wrap;
  padding-right: 54px; /* space for inline timestamp */
}
.msg .bubble a { color: #53bdeb; text-decoration: none; }
.msg .bubble a:hover { text-decoration: underline; }

.msg .who {
  font-size: 12.8px;
  font-weight: 600;
  margin: 0 0 2px;
  line-height: 1.2;
}

.msg .time {
  position: absolute;
  right: 8px;
  bottom: 4px;
  font-size: 10.5px;
  color: var(--muted);
  opacity: .85;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  user-select: none;
}

/* grouping: first in a run gets a tail + sender name, plus extra top gap */
.msg.first { margin-top: 10px; }
.msg.first:first-child { margin-top: 0; }
.msg.first .bubble {
  border-top-left-radius: 4px;
}
.msg.first .bubble::before {
  content: "";
  position: absolute;
  top: 0;
  left: -8px;
  width: 8px;
  height: 13px;
  background: var(--bubble-other);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

/* self messages */
.msg.self { align-self: flex-end; }
.msg.self .bubble {
  background: var(--bubble-self);
  color: #fff;
}
.msg.self.first .bubble { border-top-left-radius: var(--radius-lg); border-top-right-radius: 4px; }
.msg.self.first .bubble::before {
  left: auto;
  right: -8px;
  background: var(--bubble-self);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}
.msg.self .who { display: none; }
.msg.self .time { color: rgba(255,255,255,.6); }

/* grok messages */
.msg.grok .bubble {
  background: var(--bubble-grok);
  color: #efe9ff;
  border: 1px solid rgba(255,255,255,.05);
}
.msg.grok.first .bubble::before { background: var(--bubble-grok); }
.msg.grok .who { color: #c0a9ff; }
.msg.grok .time { color: rgba(255,255,255,.55); }

/* random name tint per-author */
.who[data-tint="1"] { color: #ff9f5a; }
.who[data-tint="2"] { color: #53bdeb; }
.who[data-tint="3"] { color: #e5bf50; }
.who[data-tint="4"] { color: #ff6b9b; }
.who[data-tint="5"] { color: #a0e36b; }
.who[data-tint="6"] { color: #c19bff; }
.who[data-tint="7"] { color: #ffb26b; }
.who[data-tint="8"] { color: #6be0c9; }

/* system + day separator */
.system {
  align-self: center;
  background: var(--system-bg);
  color: var(--muted);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  margin: 8px 0;
  box-shadow: 0 1px 0.5px rgba(0,0,0,.13);
  text-align: center;
}
.day-sep {
  align-self: center;
  background: var(--system-bg);
  color: var(--muted);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  margin: 14px 0 8px;
  text-transform: uppercase;
  letter-spacing: .05em;
  font-weight: 500;
  box-shadow: 0 1px 0.5px rgba(0,0,0,.13);
}

/* typing */
.typing {
  color: var(--accent);
  font-size: 12.5px;
  padding: 0 5% 4px;
  height: 18px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--chat-pattern);
}
.typing .dots { display: inline-flex; gap: 3px; margin-left: 2px; }
.typing .dots span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  animation: bounce 1.2s infinite;
}
.typing .dots span:nth-child(2) { animation-delay: .2s; }
.typing .dots span:nth-child(3) { animation-delay: .4s; }
@keyframes bounce {
  0%, 60%, 100% { opacity: .3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-2px); }
}

/* composer */
form {
  display: flex;
  gap: 8px;
  padding: 8px 12px 10px;
  background: var(--panel);
  align-items: center;
  flex-shrink: 0;
  border-top: 1px solid rgba(0,0,0,.2);
}
form input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  background: var(--panel2);
  color: var(--text);
  border: 0;
  border-radius: 10px;
  outline: none;
  font-size: 14.5px;
}
form input::placeholder { color: var(--subtle); }
form button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 0;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: filter .15s, transform .05s;
  flex-shrink: 0;
}
form button:hover { filter: brightness(1.08); }
form button:active { transform: scale(.95); }
form button:disabled { opacity: .45; cursor: not-allowed; }

/* toast */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  color: var(--text);
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 13px;
  box-shadow: var(--shadow);
  z-index: 100;
  animation: toast .3s ease-out;
  border: 1px solid var(--border);
}
@keyframes toast {
  from { opacity: 0; transform: translate(-50%, -8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* -------- responsive -------- */
@media (max-width: 768px) {
  .screen { max-width: 100%; }
  #messages { padding: 10px 3% 8px; }
  .msg { max-width: 80%; }
  .typing { padding: 0 3% 4px; }
  .meta { max-width: 45vw; }
}

@media (max-width: 480px) {
  header { padding: 8px 10px; height: 56px; }
  .avatar { width: 36px; height: 36px; font-size: 14px; }
  .title { font-size: 15px; }
  .meta { font-size: 11.5px; max-width: 40vw; }
  .msg { max-width: 85%; }
  .msg .bubble { font-size: 14px; padding: 6px 8px 7px 10px; }
  .msg .bubble .text { padding-right: 50px; }
  form { padding: 6px 8px 8px; gap: 6px; }
  form input { padding: 11px 14px; font-size: 14px; }
  form button { width: 42px; height: 42px; font-size: 17px; }
  .card { padding: 22px; }
  .card h1 { font-size: 22px; }
}

/* safe-area for iOS */
@supports (padding: max(0px)) {
  form {
    padding-bottom: max(10px, env(safe-area-inset-bottom));
  }
}