/* plaza — group chat on the open web.
   Light palette anchored on Solid purple. Generous whitespace,
   hairline rules, restrained accent (it appears only for live state
   and the user's own actions). Tabular numerals on timestamps. */

:root {
  --bg: #f9f7fc;
  --surface: #ffffff;
  --surface-alt: #fafaf6;
  --rule: rgba(35, 27, 56, 0.08);
  --rule-strong: rgba(35, 27, 56, 0.14);
  --text: #1f1a2e;
  --text-soft: #5d566f;
  --text-muted: #9c95ad;
  --selection: rgba(124, 77, 255, 0.08);
  --selection-strong: rgba(124, 77, 255, 0.20);
  --accent: #7c4dff;
  --accent-deep: #5a2be0;
  --accent-soft: #ede5ff;
  --ok: #2fa66a;
  --shadow-sm: 0 1px 2px rgba(35, 27, 56, 0.04);
  --shadow-md: 0 6px 24px rgba(35, 27, 56, 0.06);
  --shadow-bubble: 0 1px 0 rgba(35, 27, 56, 0.04);

  --type-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --type-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter",
             "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--type-ui);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "cv11", "ss03";
  letter-spacing: -0.005em;
  height: 100%;
}

body { height: 100vh; display: flex; flex-direction: column; }
button, input, textarea { font-family: inherit; font-size: inherit; color: inherit; }
button { cursor: pointer; }

/* — topbar — */

.topbar {
  max-width: 880px;
  margin: 24px auto 0;
  padding: 0 24px;
  width: 100%;
}
.topbar-inner {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
}
.topbar h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text);
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 16px;
  line-height: 1;
  align-self: center;
  overflow: hidden;
  flex-shrink: 0;
}
.brand-mark img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand-mark.has-picture { border-radius: 50%; background: transparent; }
.sub {
  font-size: 11.5px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.status-dot {
  margin-left: auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: background 200ms ease;
}
.status-dot.connecting { background: var(--text-muted); animation: pulse 1.4s ease-in-out infinite; }
.status-dot.live       { background: var(--ok); }
.status-dot.error      { background: #c0392b; }
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}
.topbar-id {
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  font-feature-settings: "tnum";
}

/* — main — */

main {
  flex: 1;
  max-width: 880px;
  width: 100%;
  margin: 16px auto 0;
  padding: 0 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

/* — room bar — */

.room-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 2px 4px;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-feature-settings: "tnum";
}
.room-host {
  font-family: var(--type-mono);
  letter-spacing: 0;
  text-transform: none;
  font-size: 12px;
  color: var(--text-soft);
}
.room-count {
  font-feature-settings: "tnum";
  margin-left: auto;
}
.room-toggle {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--accent-soft, rgba(124,77,255,0.10));
  color: var(--accent-deep, #5a30d6);
  border: 0;
  border-radius: 999px;
  padding: 4px 10px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
  font-feature-settings: "tnum";
}
.room-toggle:hover:not(:disabled) {
  background: var(--accent, #7c4dff);
  color: #fff;
}
.room-toggle:disabled { opacity: 0.6; cursor: wait; }

/* — thread — */

.thread {
  flex: 1;
  min-height: 0;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}
.thread-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  pointer-events: none;
  text-align: center;
}
.thread-empty-inner {
  max-width: 360px;
  color: var(--text-muted);
}
.thread-empty strong {
  display: block;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}
.thread-empty p {
  font-size: 13px;
  line-height: 1.55;
  margin: 0;
}

.messages {
  list-style: none;
  margin: 0;
  padding: 24px 24px 16px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scroll-behavior: smooth;
}

/* — message bubble — */

.msg {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: start;
  animation: msg-enter 220ms cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes msg-enter {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  flex-shrink: 0;
  overflow: hidden;
  user-select: none;
}
.msg-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.msg-body { min-width: 0; }
.msg-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 2px;
}
.msg-author {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.msg-author:hover { color: var(--accent-deep); }
.msg-time {
  font-size: 11px;
  color: var(--text-muted);
  font-feature-settings: "tnum";
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 120ms ease;
}
.msg-time:hover { color: var(--accent-deep); }
.msg-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.55;
  word-wrap: break-word;
  overflow-wrap: break-word;
  white-space: pre-wrap;
}
.msg-text a { color: var(--accent-deep); text-decoration: underline; text-decoration-color: var(--selection-strong); text-underline-offset: 2px; }
.msg-text a:hover { text-decoration-color: var(--accent-deep); }
.msg-text code {
  font-family: var(--type-mono);
  background: var(--surface-alt);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12.5px;
  border: 1px solid var(--rule);
}

/* Mine: subtle accent on the avatar */
.msg.mine .msg-avatar {
  background: var(--accent);
  color: #fff;
}

/* — date divider — */

.date-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 4px 0;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-feature-settings: "tnum";
}
.date-divider::before,
.date-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}

/* — composer — */

.composer {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 10px 12px 10px 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-end;
  gap: 10px;
  margin-bottom: 24px;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}
.composer:focus-within {
  border-color: var(--selection-strong);
  box-shadow: 0 0 0 3px var(--selection), var(--shadow-sm);
}
.composer-input {
  flex: 1;
  border: 0;
  outline: none;
  resize: none;
  padding: 6px 0;
  background: transparent;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
  max-height: 140px;
  font-family: inherit;
}
.composer-input::placeholder { color: var(--text-muted); }

.composer-send {
  border: 0;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: background 120ms ease, opacity 120ms ease, transform 80ms ease;
  flex-shrink: 0;
}
.composer-send:hover:not(:disabled) {
  background: var(--accent-deep);
}
.composer-send:active:not(:disabled) {
  transform: translateY(1px);
}
.composer-send:disabled {
  background: var(--text-muted);
  opacity: 0.4;
  cursor: not-allowed;
}

/* — toast — */

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  background: var(--text);
  color: #fafaf6;
  border-radius: 10px;
  padding: 10px 14px 10px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 13px;
  box-shadow: var(--shadow-md);
  z-index: 1000;
  animation: toast-rise 220ms cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes toast-rise {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}
.toast-close {
  background: transparent;
  border: 0;
  color: rgba(255, 255, 255, 0.6);
  font-size: 18px;
  line-height: 1;
  padding: 0 4px;
}
.toast-close:hover { color: #fff; }

/* — responsive — */

@media (max-width: 640px) {
  .topbar { padding: 0 16px; margin-top: 16px; }
  main { padding: 0 16px; margin-top: 12px; }
  .messages { padding: 16px; }
  .composer { margin-bottom: 16px; }
}