:root {
  color-scheme: light dark;
  --bg: #f6f6f3;
  --surface: #ffffff;
  --surface-soft: #f0f0eb;
  --text: #1b1f1c;
  --muted: #667069;
  --line: #e2e2dc;
  --accent: #15803d;
  --accent-strong: #166534;
  --accent-soft: #e8f5ec;
  --danger: #b42318;
  --shadow: 0 18px 50px rgba(24, 39, 30, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111413;
    --surface: #191d1b;
    --surface-soft: #222725;
    --text: #eef1ee;
    --muted: #9aa49d;
    --line: #2b312e;
    --accent: #4ade80;
    --accent-strong: #86efac;
    --accent-soft: #16321f;
    --danger: #fca5a5;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

button {
  cursor: pointer;
}

a {
  color: var(--accent-strong);
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.6rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  transition: background-color 140ms ease, border-color 140ms ease, transform 140ms ease;
}

.btn:hover {
  border-color: var(--accent);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.btn-quiet {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
  font-weight: 500;
}

.btn-quiet:hover {
  color: var(--text);
  background: var(--surface-soft);
}

.btn-sm {
  min-height: 2rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.85rem;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field label,
.label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.01em;
}

.input {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
}

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

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

textarea.input {
  resize: none;
}

.hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.error {
  margin: 0;
  min-height: 1.25rem;
  font-size: 0.86rem;
  color: var(--danger);
}

/* Landing */

.landing {
  width: min(100% - 2rem, 780px);
  margin: 0 auto;
  padding: clamp(2rem, 7vh, 4.5rem) 0 3rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.6rem;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.9rem;
}

.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.landing-copy {
  margin: clamp(2rem, 6vh, 3.4rem) 0 1.5rem;
}

.landing-copy h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.landing-copy p {
  margin: 0;
  max-width: 42ch;
  color: var(--muted);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem;
  padding: 0.45rem;
  background: var(--surface-soft);
  border-bottom: 1px solid var(--line);
}

.tab {
  min-height: 2.6rem;
  border: 0;
  border-radius: calc(var(--radius-sm) - 2px);
  background: transparent;
  color: var(--muted);
  font-weight: 600;
}

.tab[aria-selected="true"] {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(24, 39, 30, 0.08);
}

.tab-panel {
  display: grid;
  gap: 1rem;
  padding: clamp(1.1rem, 4vw, 1.6rem);
}

.tab-panel[hidden] {
  display: none !important;
}

.inline-form {
  display: flex;
  gap: 0.55rem;
}

.inline-form .input {
  flex: 1;
  min-width: 0;
}

.landing-note {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.recent {
  margin-top: 2rem;
}

.recent h2 {
  margin: 0 0 0.6rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.recent-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.recent-list a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.88rem;
}

.recent-list a:hover {
  border-color: var(--accent);
}

.footer-note {
  margin-top: 2.5rem;
  color: var(--muted);
  font-size: 0.8rem;
}

/* Room */

.room-page {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  width: min(100%, 860px);
  height: 100vh;
  height: 100dvh;
  margin: 0 auto;
  background: var(--surface);
  border-inline: 1px solid var(--line);
}

@media (max-width: 859px) {
  .app-shell {
    border-inline: 0;
  }
}

.room-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem clamp(0.8rem, 3vw, 1.15rem);
  padding-top: calc(0.7rem + env(safe-area-inset-top));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(10px);
}

.header-back {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 1.2rem;
  flex: none;
}

.header-back:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.room-heading {
  min-width: 0;
  flex: 1;
}

.room-heading h1 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.room-subline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.1rem;
  font-size: 0.76rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
}

.badge-private {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.conn-dot {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--muted);
  flex: none;
}

.conn-dot[data-state="online"] {
  background: var(--accent);
}

.conn-dot[data-state="offline"] {
  background: var(--danger);
}

.messages {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 1rem clamp(0.8rem, 3vw, 1.15rem) 1.4rem;
  scroll-behavior: smooth;
}

.messages-inner {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.load-older-wrap {
  display: flex;
  justify-content: center;
  padding-bottom: 0.4rem;
}

.message {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: min(85%, 34rem);
}

.message.mine {
  align-self: flex-end;
  align-items: flex-end;
}

.message-meta {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0 0.25rem;
  font-size: 0.72rem;
  color: var(--muted);
}

.message-author {
  font-weight: 600;
  color: var(--text);
  opacity: 0.8;
}

.message-body {
  margin-top: 0.15rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 4px 14px 14px 14px;
  background: var(--surface-soft);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-size: 0.94rem;
}

.message.mine .message-body {
  border-color: transparent;
  border-radius: 14px 4px 14px 14px;
  background: var(--accent-soft);
  color: var(--text);
}

.message-system {
  align-self: center;
  max-width: none;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.76rem;
  background: var(--surface-soft);
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 100%;
  padding: 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.composer {
  border-top: 1px solid var(--line);
  padding: 0.55rem clamp(0.8rem, 3vw, 1.15rem);
  padding-bottom: calc(0.55rem + env(safe-area-inset-bottom));
  background: var(--surface);
}

.composer-row {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
}

.composer textarea {
  flex: 1;
  min-height: 2.75rem;
  max-height: 10rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  resize: none;
  line-height: 1.4;
}

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

.send-btn {
  min-width: 4.6rem;
  min-height: 2.75rem;
}

.composer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.4rem;
  min-height: 1.5rem;
  font-size: 0.76rem;
  color: var(--muted);
}

.composer-meta button {
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent-strong);
  font-weight: 600;
  font-size: inherit;
}

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

/* States and dialogs */

.center-state {
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 1.5rem;
}

.state-card {
  width: min(100%, 420px);
  padding: 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.state-card h1 {
  margin: 0 0 0.4rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.state-card p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.state-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.stack {
  display: grid;
  gap: 0.7rem;
}

.lock-icon {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  margin-bottom: 0.9rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 1.1rem;
}

dialog {
  width: min(92vw, 460px);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}

dialog::backdrop {
  background: rgba(12, 18, 14, 0.48);
  backdrop-filter: blur(2px);
}

.dialog-body {
  display: grid;
  gap: 1rem;
  padding: 1.2rem;
}

.dialog-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.dialog-head h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.dialog-close {
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 1rem;
}

.dialog-close:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.divider {
  height: 1px;
  margin: 0.2rem 0;
  background: var(--line);
}

.key-box {
  width: 100%;
  min-height: 5rem;
  padding: 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  overflow-wrap: anywhere;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(1.2rem + env(safe-area-inset-bottom));
  z-index: 30;
  max-width: min(92vw, 28rem);
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.84rem;
  transform: translate(-50%, 1rem);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.install-steps {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.install-steps li {
  margin-bottom: 0.4rem;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}