/* ============== THEME ==============
   Each color is defined once for both themes with light-dark(), which picks a
   value from the active color-scheme: the OS setting by default, or the
   data-theme attribute the theme toggle sets on <html>. */
:root {
  color-scheme: light dark;
  --bg: light-dark(#f3f4f6, #0e1014);
  --surface: light-dark(#ffffff, #15181d);
  --sidebar: light-dark(#f8f9fb, #111317);
  --surface-2: light-dark(#eef0f3, #1d2128);
  --hover: light-dark(rgba(15, 23, 42, 0.06), rgba(255, 255, 255, 0.06));
  --hover-subtle: light-dark(rgba(15, 23, 42, 0.03), rgba(255, 255, 255, 0.03));
  --border: light-dark(#e4e7eb, #262a31);
  --border-strong: light-dark(#d0d5dc, #353a43);
  --text: light-dark(#1d232b, #e5e7eb);
  --text-muted: light-dark(#5d6673, #9aa2ad);
  --accent: light-dark(#2f64d6, #3b6fe0);
  --accent-fg: #ffffff;
  --accent-ink: light-dark(#2552b8, #8db0ff);
  --accent-soft: light-dark(rgba(47, 100, 214, 0.12), rgba(91, 140, 255, 0.16));
  --danger: light-dark(#c23b3b, #c94242);
  --danger-ink: light-dark(#b42f2f, #ff8a8a);
  --success: light-dark(#1d7f47, #1f8048);
  --success-ink: light-dark(#17703d, #6ad49a);
  --input-bg: light-dark(#ffffff, #1b1f25);
  --toast-bg: light-dark(#1d232b, #e5e7eb);
  --toast-fg: light-dark(#ffffff, #111317);
  --backdrop: light-dark(rgba(15, 23, 42, 0.4), rgba(0, 0, 0, 0.55));
  --shadow-color: light-dark(rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.4));
  --shadow: 0 1px 2px var(--shadow-color), 0 8px 24px var(--shadow-color);
}

:root[data-theme='light'] {
  color-scheme: light;
}

:root[data-theme='dark'] {
  color-scheme: dark;
}

/* ============== BASE ============== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 14px;
  line-height: 1.45;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

body:not(.signed-in) .signed-in-only,
body.signed-in .signed-out-only {
  display: none !important;
}

/* Features turned off in the server config (classes rendered by the server) */
.guests-disabled #guest-btn,
.room-creation-disabled #create-room-container {
  display: none !important;
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
}

/* ============== CONTROLS ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 38px;
  padding: 0 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}

.btn-primary:not(:disabled):hover {
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--surface-2);
  border-color: var(--border);
}

.btn-secondary:not(:disabled):hover {
  background: var(--hover);
}

.btn-sm {
  height: 32px;
  padding: 0 10px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.icon-btn:hover {
  background: var(--hover);
  color: var(--text);
}

.input {
  width: 100%;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--input-bg);
}

.input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.85;
}

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

.input-sm {
  height: 32px;
  padding: 0 10px;
}

.avatar {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: 50%;
  background: hsl(var(--hue, 220) 50% 40%);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  user-select: none;
}

.avatar-sm {
  width: 24px;
  height: 24px;
  font-size: 11px;
}

.role {
  display: inline-block;
  padding: 0 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
}

.role-admin {
  color: var(--danger-ink);
}

.role-moderator {
  color: var(--success-ink);
}

/* ============== LAYOUT ============== */
.app {
  display: flex;
  height: 100vh;
  height: 100dvh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  width: 280px;
  flex: 0 0 280px;
  min-height: 0;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
}

.sidebar-header {
  display: flex;
  align-items: center;
  height: 56px;
  flex: none;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
}

.brand {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  font-size: 16px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 4px 8px 12px;
}

.section-title {
  display: flex;
  justify-content: space-between;
  padding: 14px 8px 6px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  display: flex;
  align-items: center;
  border-radius: 6px;
}

.nav-item:hover {
  background: var(--hover);
}

.nav-item.active {
  background: var(--accent-soft);
}

.nav-btn {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 6px 8px;
  border: 0;
  border-radius: 6px;
  background: none;
  text-align: left;
  cursor: pointer;
}

.nav-static {
  cursor: default;
}

.nav-item.not-joined .nav-btn {
  color: var(--text-muted);
}

.nav-item.active .nav-btn {
  color: var(--accent-ink);
  font-weight: 600;
}

.nav-item.unread .nav-btn {
  color: var(--text);
  font-weight: 700;
}

.nav-icon {
  width: 24px;
  flex: none;
  color: var(--text-muted);
  font-weight: 700;
  text-align: center;
}

.nav-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-count {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 400;
}

.badge {
  min-width: 20px;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 11px;
  font-weight: 700;
  text-align: center;
}

.leave-btn {
  width: 28px;
  height: 28px;
  margin-right: 2px;
  opacity: 0;
}

.leave-btn .icon {
  width: 14px;
  height: 14px;
}

.nav-item:hover .leave-btn,
.leave-btn:focus-visible {
  opacity: 1;
}

@media (hover: none) {
  .leave-btn {
    opacity: 1;
  }
}

.join-form {
  display: flex;
  gap: 6px;
  padding: 8px;
}

.user-card {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
  padding: 12px 12px 12px 16px;
  border-top: 1px solid var(--border);
}

.user-card-info {
  flex: 1;
  min-width: 0;
}

.user-card-name {
  overflow: hidden;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-card-roles {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 2px;
}

.main {
  position: relative;
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--surface);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 56px;
  flex: none;
  padding: 0 12px 0 20px;
  border-bottom: 1px solid var(--border);
}

.menu-btn {
  display: none;
  margin-left: -8px;
}

.topbar-title {
  flex: 1;
  min-width: 0;
}

.topbar-title h1 {
  margin: 0;
  overflow: hidden;
  font-size: 16px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-meta {
  color: var(--text-muted);
  font-size: 12px;
}

/* ============== WELCOME ============== */
.welcome {
  display: grid;
  flex: 1;
  place-items: center;
  overflow-y: auto;
  padding: 24px 16px;
  background: var(--bg);
}

.welcome-card {
  width: min(100%, 380px);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.welcome-card h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

.welcome-card p {
  margin: 0;
  color: var(--text-muted);
}

.field {
  margin-top: 20px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 600;
}

.field-hint {
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 12px;
}

.welcome-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.welcome-actions .btn {
  flex: 1;
}

.connection-state {
  min-height: 20px;
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

/* ============== CHAT ============== */
.chat {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
}

.messages {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
  overflow-y: auto;
  padding: 12px 0 8px;
}

.msg {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  column-gap: 12px;
  padding: 2px 20px;
}

.msg:hover {
  background: var(--hover-subtle);
}

.msg.first {
  margin-top: 10px;
  padding-top: 4px;
}

/* Anchor short conversations to the bottom, next to the composer
   (after .msg.first so it wins over that margin) */
.messages > :first-child {
  margin-top: auto;
}

.msg-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.msg-author {
  overflow: hidden;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.msg.own .msg-author {
  color: var(--accent-ink);
}

.msg-time {
  flex: none;
  color: var(--text-muted);
  font-size: 11.5px;
}

.msg-gutter-time {
  padding-top: 2px;
  color: var(--text-muted);
  font-size: 10.5px;
  text-align: right;
  visibility: hidden;
}

.msg:hover .msg-gutter-time {
  visibility: visible;
}

.msg-text {
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.system-msg {
  padding: 6px 20px;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

.empty-state {
  margin: auto;
  padding: 40px 20px;
  color: var(--text-muted);
  text-align: center;
}

.empty-state strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-size: 15px;
}

.typing {
  height: 20px;
  flex: none;
  overflow: hidden;
  padding: 0 20px;
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.composer {
  flex: none;
  padding: 0 16px 16px;
}

.composer-box {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 5px 5px 5px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--input-bg);
}

.composer-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.composer textarea {
  flex: 1;
  min-width: 0;
  max-height: 160px;
  padding: 6px 0;
  border: 0;
  outline: none;
  background: transparent;
  line-height: 1.45;
  resize: none;
}

.composer textarea:disabled {
  cursor: not-allowed;
}

.send-btn {
  width: 34px;
  height: 34px;
  padding: 0;
}

.toast {
  position: absolute;
  top: 68px;
  left: 50%;
  z-index: 10; /* Below the mobile sidebar and its backdrop */
  max-width: calc(100% - 32px);
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--toast-bg);
  color: var(--toast-fg);
  box-shadow: var(--shadow);
  font-size: 13px;
  transform: translateX(-50%);
}

.toast.error {
  background: var(--danger);
  color: #ffffff;
}

.toast.success {
  background: var(--success);
  color: #ffffff;
}

.backdrop {
  display: none;
}

/* ============== SMALL SCREENS ============== */
@media (max-width: 760px) {
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 20;
    width: min(85vw, 300px);
    box-shadow: var(--shadow);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }

  body.sidebar-open .sidebar {
    transform: none;
  }

  body.sidebar-open .backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 15;
    background: var(--backdrop);
  }

  body.signed-in .menu-btn {
    display: inline-grid;
  }

  .topbar {
    padding-left: 16px;
  }

  .msg,
  .system-msg,
  .typing {
    padding-left: 12px;
    padding-right: 12px;
  }

  .composer {
    padding: 0 10px 10px;
  }

  /* 16px avoids iOS zooming into focused inputs */
  .input,
  .composer textarea {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar {
    transition: none;
  }
}