/* Devolution — Phase 1 dark layout.
 * Header / messages / sidebar / input. Mobile breakpoint at 720px.
 * Hardcoded color custom properties; no theme switcher (per PRODUCT.md). */

:root {
  color-scheme: dark;
  --bg: #0e0f12;
  --bg-elev: #15171c;
  --bg-soft: #1a1d24;
  --border: #262a33;
  --fg: #d8dadf;
  --fg-strong: #f1f3f6;
  --muted: #8b8f99;
  --accent: #7aa2f7;
  --error: #f7768e;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  line-height: 1.5;
  height: 100dvh;
  overflow: hidden;
}

#app {
  display: grid;
  grid-template-areas:
    'header header'
    'messages sidebar'
    'input input';
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 1fr 220px;
  height: 100dvh;
}

.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}

.header__logo {
  font-weight: 700;
  color: var(--fg-strong);
  letter-spacing: 0.05em;
}

.header__nick {
  color: var(--muted);
}

.header__nick strong {
  color: var(--fg-strong);
  font-weight: 600;
}

.messages {
  grid-area: messages;
  overflow-y: auto;
  padding: 0.5rem 1rem;
  background: var(--bg);
}

.message {
  padding: 0.125rem 0;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

.message__time {
  color: var(--muted);
  margin-right: 0.5rem;
}

.message__nick {
  color: var(--accent);
  margin-right: 0.5rem;
  font-weight: 600;
}

.message__text {
  color: var(--fg);
  white-space: pre-wrap;
}

.message__nick {
  cursor: pointer;
}

.message__nick:hover {
  text-decoration: underline;
}

.message.mention-me {
  border-left: 2px solid var(--accent);
  background: rgba(122, 162, 247, 0.06);
  padding-left: 0.5rem;
}

.mention {
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
}

.mention:hover {
  text-decoration: underline;
}

.media-placeholder {
  color: var(--muted);
  cursor: pointer;
  border: 1px solid var(--border);
  padding: 0 0.25rem;
  border-radius: 2px;
  background: var(--bg-soft);
  font-size: 0.9em;
  display: inline-block;
  user-select: none;
}

.media-placeholder:hover {
  color: var(--fg-strong);
  border-color: var(--accent);
}

.media-revealed {
  display: block;
  max-width: min(100%, 480px);
  max-height: 480px;
  margin: 0.25rem 0;
  border: 1px solid var(--border);
}

img.media-revealed {
  height: auto;
}

.sidebar {
  grid-area: sidebar;
  background: var(--bg-elev);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 0.5rem 1rem;
}

.sidebar__title {
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  margin: 0 0 0.5rem;
}

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

.sidebar__item {
  padding: 0.125rem 0;
  color: var(--fg);
  cursor: pointer;
}

.sidebar__item:hover {
  color: var(--fg-strong);
}

.sidebar__item--me {
  color: var(--accent);
  font-weight: 600;
}

.input {
  grid-area: input;
  display: flex;
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
}

.input__field {
  flex: 1;
  background: var(--bg-soft);
  color: var(--fg);
  border: none;
  outline: none;
  padding: 0.75rem 1rem;
  font: inherit;
  resize: none;
  min-height: 5rem;
  max-height: 200px;
  overflow-y: auto;
  line-height: 1.5;
}

.input__field:focus {
  background: var(--bg-elev);
}

.input__field:disabled {
  opacity: 0.5;
}

.banner {
  background: var(--bg-soft);
  color: var(--muted);
  padding: 0.25rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.banner--error {
  color: var(--error);
}

.messages__empty {
  color: var(--muted);
  font-style: italic;
  padding: 1rem 0;
  text-align: center;
}

.header__drawer-toggle {
  display: none;
  background: var(--bg-soft);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  font: inherit;
  cursor: pointer;
}

.header__drawer-toggle:hover {
  color: var(--fg-strong);
  border-color: var(--accent);
}

.drawer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 5;
}

/* Auth ("gate") screen overrides #app's chat grid layout. The higher
 * specificity (#app.gate vs #app) ensures the grid template areas defined
 * for the chat layout don't bleed into the auth view. */
#app.gate {
  display: grid;
  grid-template-areas: none;
  grid-template-rows: auto;
  grid-template-columns: auto;
  place-items: center;
  min-height: 100dvh;
  padding: 1rem;
}

.gate__card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  max-width: 360px;
  padding: 2rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.gate__title {
  color: var(--fg-strong);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin: 0;
  text-align: center;
}

.gate__tagline {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.4;
  margin: 0;
  text-align: center;
}

.gate__form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.gate__input {
  background: var(--bg-soft);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  font: inherit;
  outline: none;
}

.gate__input:focus {
  border-color: var(--accent);
}

.gate__buttons {
  display: flex;
  gap: 0.5rem;
}

.gate__button {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0.5rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  flex: 1;
}

.gate__button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.gate__button--secondary {
  background: var(--bg-soft);
  color: var(--fg);
  border: 1px solid var(--border);
}

.gate__error {
  color: var(--error);
  margin: 0;
  min-height: 1.25rem;
  text-align: center;
}

.header__right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  position: relative;
}

.header__panel {
  position: relative;
}

.header__panel-trigger {
  list-style: none;
  cursor: pointer;
  color: var(--muted);
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  user-select: none;
}

.header__panel-trigger::-webkit-details-marker {
  display: none;
}

.header__panel[open] .header__panel-trigger {
  color: var(--fg-strong);
  border-color: var(--accent);
}

.header__panel-form {
  position: absolute;
  right: 0;
  top: calc(100% + 0.25rem);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 0.75rem;
  z-index: 10;
  min-width: 16rem;
}

.header__panel-form input {
  background: var(--bg-soft);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.4rem 0.5rem;
  font: inherit;
  outline: none;
}

.header__panel-form input:focus {
  border-color: var(--accent);
}

.header__panel-button {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0.4rem 0.75rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.header__panel-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.header__panel-error,
.header__panel-success {
  position: absolute;
  right: 0;
  top: 100%;
  margin: 0;
  padding: 0.25rem 0;
  font-size: 0.85rem;
}

.header__panel-error {
  color: var(--error);
}

.header__panel-success {
  color: var(--accent);
}

/* Push the inline error/success below the popover so they don't overlap. */
.header__panel[open] .header__panel-error,
.header__panel[open] .header__panel-success {
  position: static;
  text-align: right;
}

.header__logout {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  font: inherit;
  cursor: pointer;
}

.header__logout:hover {
  color: var(--fg-strong);
  border-color: var(--accent);
}

@media (max-width: 720px) {
  #app {
    grid-template-areas:
      'header'
      'messages'
      'input';
    grid-template-rows: auto 1fr auto;
    grid-template-columns: 1fr;
  }

  .header__drawer-toggle {
    display: inline-block;
  }

  .sidebar {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(280px, 80vw);
    z-index: 10;
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.18s ease-out;
    box-shadow: -4px 0 16px rgba(0, 0, 0, 0.4);
  }

  .sidebar[data-open='true'] {
    transform: translateX(0);
  }

  .drawer-backdrop[data-open='true'] {
    display: block;
  }
}

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