* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: 1.4;
  overflow: hidden;
  overscroll-behavior: none;
}

button, input, select { font: inherit; }

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

.setup,
.chat,
.picker {
  position: fixed;
  top: var(--app-top, 0px);
  left: 0;
  right: 0;
  bottom: 0;
  /* Fill the layout viewport. While the keyboard is open, JS pins the box to the visual viewport via --app-h and --app-top (see syncViewport). */
  height: var(--app-h, auto);
  overflow: hidden;
  background: var(--paper);
}

.setup[hidden],
.chat[hidden],
.picker[hidden] {
  display: none !important;
}

.setup {
  display: flex;
  flex-direction: column;
}

.setup-scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-4);
  padding-bottom: calc(var(--space-4) + var(--safe-bottom));
}

.setup .card {
  width: 100%;
  max-width: none;
  margin-top: 0;
  margin-bottom: 0;
  border: 0;
  box-shadow: none;
  background: transparent;
  overflow: visible;
}

#setup .setup-scroll {
  justify-content: flex-start;
  align-items: center;
  padding: 0;
}

#setup-form {
  width: min(56rem, 100%);
  gap: var(--space-12);
  padding: var(--space-8) var(--space-6);
}

.intro-pitch,
.setup-action {
  display: flex;
  flex-direction: column;
}

.setup-action { gap: var(--space-8); }

/* Two pickers side by side with the swap arrows between them. */
.pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2);
}

.pair-icon {
  width: var(--space-6);
  height: var(--space-6);
  color: var(--ink-soft);
}

[dir="rtl"] .pair-icon { transform: scaleX(-1); }

#setup-form footer {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2);
  padding: 0;
}

.intro-credit {
  flex: 0 0 auto;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin: 0;
  padding: 0 var(--space-4) calc(var(--space-2) + var(--safe-bottom));
  color: var(--ink-soft);
  font-size: var(--text-sm);
  line-height: 1.3;
  text-align: center;
  white-space: nowrap;
}

.intro-credit p {
  margin: 0;
}

.intro-credit a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  color: var(--ink-soft);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.help ul {
  margin: 0;
  padding-inline-start: var(--space-5);
  display: grid;
  gap: var(--space-3);
  font-size: var(--text-md);
  line-height: 1.45;
}

#setup-close,
#help-back {
  flex: 0 0 auto;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  color: var(--ink);
}

#setup-close[hidden] { display: none; }

#setup-close svg,
#help-back svg {
  width: var(--space-6);
  height: var(--space-6);
}

[dir="rtl"] #help-back svg { transform: scaleX(-1); }

/* Phones: the page column stretches to the screen. */
@media (max-width: 40rem) {
  .setup-scroll { align-items: stretch; }
}

/* Wide screens: one column. The pitch is plain text. How it works is the card. */
@media (min-width: 48rem) {
  #setup .setup-scroll {
    justify-content: flex-start;
    align-items: center;
    padding: 0;
  }

  #setup-form {
    gap: var(--space-16);
    padding-block: var(--space-16);
  }

  #help .setup-scroll {
    align-items: center;
    padding: var(--space-8) var(--space-12) calc(var(--space-12) + var(--safe-bottom));
  }

  #help .card {
    width: min(64rem, 100%);
  }

  #setup .card > header,
  #help .card > header {
    text-align: start;
    justify-items: start;
  }

  .setup-action {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-control);
    padding: var(--space-10);
    text-align: start;
  }
}

@media (min-width: 64rem) {
  #setup-form { padding-block: var(--space-20); }
}

@media (min-width: 80rem) {
  .intro-pitch { gap: var(--space-6); }

  #setup .intro-pitch h1 {
    font-size: var(--text-3xl);
    letter-spacing: -0.05em;
  }
}

.setup h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0;
  text-transform: none;
}

#setup h1 {
  font-size: var(--text-hero);
  line-height: 1.1;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.intro-pitch {
  gap: var(--space-4);
  text-align: center;
}

.intro-points {
  display: grid;
  gap: var(--space-6);
  font-size: var(--text-md);
}

@media (min-width: 40rem) {
  #setup .intro-points p { font-size: var(--text-lead); }
}

.intro-points p,
.intro-points li {
  margin: 0;
  line-height: 1.45;
}

.intro-points ul {
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  padding-inline-start: var(--space-6);
  list-style: disc;
  text-align: start;
}

.intro-points li {
  display: list-item;
}

.intro-points li + li {
  margin-top: var(--space-4);
}

.intro-how {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.setup h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0;
  text-transform: none;
}

.intro-steps {
  margin: 0;
  padding-inline-start: var(--space-6);
  list-style: decimal;
  font-size: var(--text-md);
  line-height: 1.45;
}

.intro-steps li {
  display: list-item;
}

.intro-steps li + li {
  margin-top: var(--space-4);
}

#setup-form footer .btn {
  width: 100%;
}

.chat {
  display: flex;
  flex-direction: column;
  background: var(--panel);
}

.top {
  position: relative;
  z-index: 2;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap);
  padding: calc(var(--space-2) + var(--safe-top)) var(--space-3) var(--space-2);
  background: var(--paper);
}

.brand {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0;
  text-transform: none;
}

#menu {
  flex: 0 0 auto;
  width: var(--tap);
  height: var(--tap);
  min-width: var(--tap);
  min-height: var(--tap);
  padding: 0;
  color: var(--ink);
}

#menu svg {
  width: var(--space-6);
  height: var(--space-6);
}

.chat .top > #new-chat,
#chat-title { display: none; }

#new-chat {
  background: var(--brass);
  color: var(--brass-ink);
  border-color: var(--brass);
}

#new-chat:hover,
#new-chat:focus-visible {
  background: var(--brass);
  color: var(--brass-ink);
}

#menu-new-chat {
  min-height: var(--tap);
  border-color: transparent;
  background: transparent;
  color: var(--ink);
  box-shadow: none;
}

#menu-new-chat:hover,
#menu-new-chat:focus-visible {
  border-color: transparent;
  background: var(--theirs);
  color: var(--ink);
  box-shadow: none;
  outline: none;
}

#new-chat {
  flex: 0 1 auto;
  min-width: var(--tap);
  min-height: var(--tap);
  padding-inline: var(--space-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.menu {
  position: absolute;
  top: 100%;
  inset-inline-start: var(--space-2);
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 12rem;
  margin: 0;
  padding: var(--space-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.menu[hidden] { display: none !important; }

.menu-name {
  display: flex;
  align-items: center;
  min-height: var(--tap);
  margin: 0;
  padding: 0 var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

a.brand,
a.menu-name {
  color: var(--ink);
  text-decoration: none;
}

.menu .btn {
  width: 100%;
  justify-content: flex-start;
  background: transparent;
  color: var(--ink);
}

.lang-tabs {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 0;
  height: var(--tap);
}

.tab {
  flex: 1 1 0;
  min-width: 0;
  min-height: var(--tap);
  padding-inline: var(--space-3);
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: var(--text-md);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tab:hover,
.tab:focus-visible {
  background: transparent;
  color: var(--ink);
}

.tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.btn {
  min-height: var(--tap);
  min-width: var(--tap);
  font-size: var(--text-sm);
}

.lang-button {
  display: block;
  width: 100%;
  min-width: 0;
  height: var(--tap);
  min-height: var(--tap);
  padding-inline: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--panel);
  color: var(--ink);
  font-size: var(--text-input);
  line-height: 1.3;
  text-align: start;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

/* Language sheet: a full-screen shell like setup and chat, so it follows the keyboard the same way. */
.modal {
  position: fixed;
  inset: 0;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  background: color-mix(in srgb, var(--ink) 45%, transparent);
}

.modal[hidden] { display: none !important; }

.modal-card {
  width: min(24rem, 100%);
  margin: 0;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.modal-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.modal-head h2 {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.2;
}

#new-dialog-close {
  flex: 0 0 auto;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  color: var(--ink);
}

#new-dialog-close svg {
  width: var(--space-6);
  height: var(--space-6);
}

.modal-card > .btn { width: 100%; }

.picker {
  z-index: 5;
  display: flex;
  flex-direction: column;
}

.picker .brand { font-size: var(--text-lg); }

.picker-search {
  flex: 0 0 auto;
  padding: 0 var(--space-3) var(--space-2);
  background: var(--paper);
}

#picker-search {
  width: 100%;
  height: var(--tap);
  padding-inline: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--theirs);
  color: var(--ink);
  font-size: var(--text-input);
}

.picker-list {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  margin: 0;
  padding: 0 var(--space-3) calc(var(--space-3) + var(--safe-bottom));
  list-style: none;
}

.picker-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  width: 100%;
  min-height: var(--tap);
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: var(--text-md);
  text-align: start;
  cursor: pointer;
}

.picker-name,
.picker-native {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.picker-native {
  flex: 1 1 auto;
  color: var(--ink-soft);
  font-size: var(--text-sm);
}

.picker-item[aria-current="true"] {
  background: var(--accent);
  border-radius: var(--radius-tight);
}

.picker-item[aria-current="true"]::after {
  content: "\2713";
  margin-inline-start: auto;
  font-weight: 600;
}

.picker-sep {
  height: var(--space-3);
}

.empty {
  width: min(var(--column), 100%);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) 0;
  text-align: center;
  color: var(--ink-soft);
  font-size: var(--text-md);
}

#thread {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  margin: 0;
  padding-block: var(--space-3);
  padding-inline: max(var(--space-3), calc((100% - var(--column)) / 2));
  display: flex;
  flex-direction: column;
  gap: 0;
}

.bubble {
  display: block;
  max-width: 78%;
  margin: var(--gap-turn) 0 0;
  padding: var(--space-3);
}

.bubble.follow { margin-top: var(--gap-run); }
.bubble:first-child { margin-top: 0; }

.bubble .text {
  margin: 0;
  font-size: var(--text-md);
  line-height: 1.35;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.bubble.mine {
  align-self: flex-end;
  background: var(--own);
  color: var(--own-ink);
  border-radius: var(--radius-bubble);
}

.bubble.theirs {
  align-self: flex-start;
  background: var(--theirs);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-bubble);
}

.bubble.mine:not(:has(+ .follow)) {
  border-end-end-radius: var(--radius-tight);
}

.bubble.theirs:not(:has(+ .follow)) {
  border-end-start-radius: var(--radius-tight);
}

.error {
  flex: 0 0 auto;
  width: min(var(--column), 100%);
  margin: 0 auto;
  padding: 0 var(--space-3);
  color: var(--danger);
  font-size: var(--text-sm);
}

.error:empty { display: none; }

.dock {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3) calc(var(--space-2) + var(--safe-bottom));
  background: var(--paper);
}

html.keyboard-open .dock {
  padding-bottom: var(--space-2);
}

#composer {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  width: min(var(--column), 100%);
  min-height: calc(var(--send) + (var(--space-1) * 2) + 2px);
  margin: 0 auto;
  padding-block: var(--space-1);
  padding-inline-start: var(--space-4);
  padding-inline-end: var(--space-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--theirs);
}

#draft {
  flex: 1;
  width: auto;
  min-width: 0;
  height: var(--tap);
  min-height: 0;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  outline: none;
  outline-width: 0;
  box-shadow: none;
  appearance: none;
  background: transparent;
  color: var(--ink);
  font-size: var(--text-input);
  line-height: 1.3;
}

#draft:focus,
#draft:focus-visible {
  outline: none;
  outline-width: 0;
  box-shadow: none;
}

#composer:focus-within {
  outline: 2px solid var(--own);
  outline-offset: 2px;
}

#draft::placeholder { color: var(--ink-soft); }

#send {
  flex: 0 0 auto;
  width: var(--send);
  height: var(--send);
  min-width: var(--send);
  min-height: var(--send);
  padding: 0;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--own);
  color: var(--own-ink);
  display: grid;
  place-items: center;
  cursor: pointer;
}

#send:disabled {
  background: var(--line);
  color: var(--ink-soft);
  opacity: 1;
  cursor: default;
}
#send svg { width: var(--space-5); height: var(--space-5); }

@media (min-width: 48rem) {
  #menu,
  #chat-menu { display: none !important; }

  .chat .top > #new-chat { display: inline-flex; }

  #chat-title {
    display: inline-flex;
    align-items: center;
    min-height: var(--tap);
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
    z-index: 1;
  }

  .chat .top {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
  }

  .chat .lang-tabs {
    grid-column: 1 / -1;
    grid-row: 1;
    justify-self: center;
    width: max-content;
    max-width: calc(100% - 20rem);
    flex: none;
  }

  .chat .tab {
    flex: 0 1 auto;
    padding-inline: var(--space-6);
  }

  .chat #new-chat {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
    z-index: 1;
    max-width: none;
  }
}

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

/* When the device changes hands, the re-drawn bubbles slide in from the side they left. */
@keyframes bubble-swap {
  from { opacity: 0; transform: translateX(var(--swap-from)); }
}

@media (prefers-reduced-motion: no-preference) {
  #thread.swap .bubble { animation: bubble-swap 200ms ease-out; }
  #thread.swap .bubble.mine { --swap-from: calc(var(--space-3) * -1); }
  #thread.swap .bubble.theirs { --swap-from: var(--space-3); }
  [dir="rtl"] #thread.swap .bubble.mine { --swap-from: var(--space-3); }
  [dir="rtl"] #thread.swap .bubble.theirs { --swap-from: calc(var(--space-3) * -1); }
}

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