/* ---------- Primitives ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4em;
  font: inherit; font-weight: 700; cursor: pointer; border: 0;
  padding: .6em 1.1em; border-radius: var(--radius-pill);
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:active { transform: scale(.97); }
.btn--primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-pop); }
.btn--primary:hover { transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--text-soft); box-shadow: none; }
.btn--ghost:hover { background: var(--bg-muted); }
.btn--gemini { background: var(--sky); color: #fff; box-shadow: 0 8px 20px rgba(91, 184, 232, .30); }
.btn--gemini:hover { transform: translateY(-1px); }

.input {
  font: inherit; width: 100%;
  padding: .7em .9em; border-radius: var(--radius-md);
  border: 1.5px solid var(--accent-line); background: var(--bg-surface); color: var(--text-strong);
  resize: none;
}
.input::placeholder { color: var(--text-soft); }
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.pill {
  display: inline-block; padding: .45em .85em; border-radius: var(--radius-pill);
  font-size: .9em; font-weight: 600;
}
.pill--error { background: var(--danger-soft); color: var(--danger); }

.card {
  background: var(--bg-surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); padding: 2rem 1.75rem;
}

/* ---------- Join screen ---------- */
.join {
  min-height: 100dvh; display: grid; place-items: center; padding: 1.5rem;
}
.join__card { width: 100%; max-width: 420px; text-align: center; }
.join__title { font-size: 2rem; margin: 0 0 .25rem; }
.join__subtitle { color: var(--text); margin: 0 0 1.5rem; }
.join__prompt { font-weight: 700; margin: 1rem 0; }
.join__form { display: grid; gap: .9rem; margin-bottom: .5rem; }

.lang-tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.lang-tile {
  display: grid; gap: .4rem; place-items: center; text-decoration: none; color: var(--text-strong);
  padding: 1.4rem 1rem; border-radius: var(--radius-lg);
  background: var(--bg-muted); box-shadow: var(--shadow-sm);
  transition: transform .14s ease, box-shadow .14s ease;
}
.lang-tile:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.lang-tile__flag { font-size: 2.4rem; }
.lang-tile__name { font-weight: 700; }

/* ---------- Chat shell (mobile-first centered column) ---------- */
.chat {
  display: flex; flex-direction: column;
  height: 100dvh; max-width: 580px; margin: 0 auto; background: var(--bg-chat);
}
.chat__header {
  display: flex; align-items: center; gap: .6rem;
  padding: .7rem 1rem; background: var(--bg-surface); box-shadow: var(--shadow-sm);
  position: sticky; top: 0; z-index: 5;
}
.chat__brand { font-size: 1.1rem; }
.chat__swap { color: var(--accent); font-weight: 800; }
.chat__title { font-weight: 800; }
.chip {
  margin-left: auto; padding: .3em .7em; border-radius: var(--radius-pill);
  background: var(--accent-soft); color: var(--text-strong); font-weight: 700; font-size: .85rem;
  white-space: nowrap;
}
.chat__actions { display: flex; gap: .15rem; margin-left: auto; }
.chat__actions .btn { padding: .4em .55em; font-size: .8rem; }
.chat__actions form { margin: 0; }
.chip { margin-left: 0; }

/* Toast (flash notice), e.g. after ending a chat. */
.toast {
  margin: .6rem auto 0; display: block; width: fit-content;
  background: var(--accent-soft); color: var(--text-strong);
}

/* History list */
.history { padding: 1rem; overflow-y: auto; }
.history__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .6rem; }
.history__link {
  display: block; text-decoration: none; color: var(--text-strong);
  background: var(--bg-surface); border: 1px solid var(--accent-line);
  border-radius: var(--radius-md); padding: .8rem 1rem; box-shadow: var(--shadow-sm);
  transition: transform .12s ease, box-shadow .12s ease;
}
.history__link:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.history__date { font-weight: 700; font-size: .8rem; color: var(--text-soft); }
.history__summary { margin: .3rem 0; }
.history__summary--empty { color: var(--text-soft); font-style: italic; }
.history__count { font-size: .78rem; color: var(--accent); font-weight: 700; }

/* Summary card atop a past transcript */
.summary-card {
  margin: 1rem 1rem 0; padding: .9rem 1rem;
  background: linear-gradient(135deg, var(--sky-soft), var(--bg-surface));
  border: 1px solid var(--sky); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
}
.summary-card__label { font-weight: 800; color: var(--sky); font-size: .85rem; }
.summary-card__en { margin: .4rem 0 0; }
.summary-card__th { margin: .25rem 0 0; font-size: .9em; opacity: .85; }

/* Past transcript: stack the summary card above the (non-scrolling) message list. */
.chat__body.transcript { flex-direction: column; overflow-y: auto; }
.transcript .msg-list { flex: none; overflow: visible; }

.chat__body { flex: 1; overflow: hidden; display: flex; }
.msg-list {
  flex: 1; overflow-y: auto; padding: 1rem; display: flex; flex-direction: column; gap: .75rem;
}

/* ---------- Empty state ---------- */
.empty {
  margin: auto; text-align: center; color: var(--text-soft);
}
/* Hide the placeholder once a live-broadcast bubble lands in the same list. */
#messages:has(.msg) #empty_state { display: none; }
.empty__icon { font-size: 3rem; display: block; }
.empty__en { font-weight: 700; margin: .5rem 0 0; }
.empty__th { margin: .15rem 0 0; }

/* ---------- Dual-language bubble (CSS-driven orientation, §10.6) ---------- */
.msg { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; max-width: 78%; }
[data-viewer-role="en"] .msg[data-sender="en"],
[data-viewer-role="th"] .msg[data-sender="th"] { align-items: flex-end; align-self: flex-end; }

.msg__who { font-size: .78rem; font-weight: 700; color: var(--text-soft); padding: 0 .4rem; }

.bubble {
  background: var(--bg-surface); border: 1px solid var(--accent-line);
  border-radius: var(--radius-lg); padding: .65rem .85rem; box-shadow: var(--shadow-sm);
}
[data-viewer-role="en"] .msg[data-sender="en"] .bubble,
[data-viewer-role="th"] .msg[data-sender="th"] .bubble {
  background: var(--accent-soft); border-color: var(--accent-line);
}

.bubble__en, .bubble__th { margin: 0; }
/* Secondary (other) language: smaller, dimmed, divided. */
[data-viewer-role="th"] .bubble__en,
[data-viewer-role="en"] .bubble__th {
  font-size: .82em; opacity: .72; margin-top: .4em; padding-top: .4em;
  border-top: 1px solid rgba(150,140,150,.25);
}
.bubble time { display: block; margin-top: .35em; font-size: .7rem; color: var(--text-soft); }

/* ---------- Gemini (AI): the distinct third voice ---------- */
.msg[data-sender="ai"] { align-self: stretch; align-items: stretch; max-width: 100%; }
.msg[data-sender="ai"] .msg__who { color: var(--sky); }
.msg[data-sender="ai"] .msg__who::after { content: " · ผู้ช่วย AI"; color: var(--text-soft); font-weight: 600; }
.msg[data-sender="ai"] .bubble {
  background: linear-gradient(135deg, var(--sky-soft), var(--bg-surface));
  border: 1px solid var(--sky);
  box-shadow: var(--shadow-sm);
  position: relative;
}
/* A little sparkle tab so it reads as "not a person" at a glance. */
.msg[data-sender="ai"] .bubble::before {
  content: "✨"; position: absolute; top: -10px; right: 12px;
  background: var(--sky); color: #fff; font-size: .75rem;
  width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center;
  box-shadow: var(--shadow-sm);
}

/* ---------- Composer (voice-first) ---------- */
.composer {
  padding: 1rem; background: var(--bg-surface); box-shadow: 0 -2px 6px rgba(43,35,48,.06);
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
}
#composer_status:not(:empty) { padding-bottom: .25rem; }

.mic { display: flex; flex-direction: column; align-items: center; gap: .5rem; }
.mic__button {
  position: relative; width: 76px; height: 76px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-pop);
  display: grid; place-items: center; font-size: 1.8rem;
  transition: transform .14s ease, box-shadow .14s ease;
}
.mic__button:hover { transform: translateY(-2px); }
.mic__glyph--recording { display: none; }
.mic__ring {
  position: absolute; inset: -6px; border-radius: 50%; border: 3px solid var(--accent);
  opacity: 0; pointer-events: none;
}

/* Mode toggle — drives both the mic and the text box. */
.mode-toggle {
  display: inline-flex; align-self: center; gap: 2px; padding: 3px;
  background: var(--bg-muted); border-radius: var(--radius-pill);
}
.mode-toggle__btn {
  border: 0; background: transparent; font: inherit; font-weight: 700; cursor: pointer;
  color: var(--text-soft); padding: .4em .9em; border-radius: var(--radius-pill);
  transition: background .12s ease, color .12s ease;
}
.mode-toggle__btn.is-active { background: var(--bg-surface); color: var(--text-strong); box-shadow: var(--shadow-sm); }
.composer[data-mode="ask"] .mode-toggle__btn[data-mode="ask"].is-active { color: var(--sky); }

/* Ask-Gemini mode tints the mic sky-blue so it's obvious what tapping will do. */
.composer[data-mode="ask"] .mic__button { background: var(--sky); box-shadow: 0 12px 32px rgba(91, 184, 232, .30); }
.composer[data-mode="ask"] .mic__ring { border-color: var(--sky); }

/* Helper text: hide all, then show exactly one based on state + mode. */
.mic__helper { margin: 0; font-weight: 700; color: var(--text); font-size: .95rem; display: none; }
.composer[data-state="idle"][data-mode="translate"] .h-idle-translate { display: block; }
.composer[data-state="idle"][data-mode="ask"] .h-idle-ask { display: block; }
.composer[data-state="recording"] .h-recording { display: block; }
.composer[data-state="processing"][data-mode="translate"] .h-proc-translate { display: block; }
.composer[data-state="processing"][data-mode="ask"] .h-proc-ask { display: block; }

/* Mic glyph + ring + button state (mode-independent). */
[data-state="recording"] .mic__glyph--idle { display: none; }
[data-state="recording"] .mic__glyph--recording { display: block; }
[data-state="recording"] .mic__ring { opacity: 1; animation: mic-pulse 1.4s ease-out infinite; }
[data-state="processing"] .mic__button { opacity: .7; pointer-events: none; }

.mic__denied[hidden] { display: none; }
.mic__denied:not([hidden]) { display: inline-block; }

/* Text fallback hidden until toggled (or mic denied). */
.composer__text { display: none; width: 100%; flex-direction: column; gap: .5rem; }
.composer[data-fallback="true"] .composer__text { display: flex; }
.composer[data-fallback="true"] .mic { display: none; }
.composer__input { width: 100%; }
.composer__actions { display: flex; gap: .5rem; }
.composer__actions .btn { flex: 1; }

@keyframes mic-pulse {
  0%   { transform: scale(1);   opacity: .7; }
  100% { transform: scale(1.5); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .mic__ring { animation: none !important; }
  .btn, .lang-tile, .mic__button { transition: none !important; }
}