/* Vietalk — minimal, mobile-first, dark by default */

:root {
  --bg: #0b0d10;
  --bg-card: #141820;
  --bg-elev: #1c2230;
  --border: #232932;
  --border-strong: #353c47;
  --text: #e6e8eb;
  --text-mute: #8a939c;
  --text-faint: #5a6672;
  --accent: #7cc4ff;
  --accent-strong: #5eb4ff;
  --ru: #ef4444;
  --vi: #fbbf24;
  --ok: #34d399;
  --warn: #fbbf24;
  --bad: #ef4444;
  --shadow: 0 20px 60px rgba(0,0,0,0.5);
  --safe-top: env(safe-area-inset-top);
  --safe-bot: env(safe-area-inset-bottom);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  font-size: 16px;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  padding-top: var(--safe-top);
}

/* ============ topbar (compact) ============ */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: rgba(11,13,16,0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  flex-shrink: 0;
}
.brand { font-size: 0.95rem; }
.brand-icon { font-size: 1.05rem; }
.settings-btn { width: 30px; height: 30px; font-size: 0.95rem; border-radius: 8px; }

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1.05rem;
}

.brand-icon { font-size: 1.3rem; }

.settings-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all .15s;
}
.settings-btn:hover { border-color: var(--border-strong); background: var(--bg-card); }

/* ============ compact lang strip ============ */
.lang-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}
.lang-mini {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
}
.lang-mini .flag { font-size: 0.95rem; }
.lang-mini .code { font-size: 0.78rem; color: var(--text-mute); }
.lang-arrow {
  color: var(--text-mute);
  font-size: 0.95rem;
}
.lang-spacer { flex: 1; }
.lang-status {
  font-size: 0.78rem;
  color: var(--text-mute);
  text-align: right;
  min-width: 80px;
}
.lang-status.recording { color: var(--ru); }
.lang-status.processing { color: var(--accent); }
.lang-status.error { color: var(--bad); }

/* legacy fallbacks */
.lang { display: none; }
.auto-toggle { display: none; }

/* ============ conversation ============ */
.conversation {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: var(--conv-font, 0.97rem);
  line-height: 1.4;
  /* allow native pinch-zoom on touch devices */
  touch-action: pan-y pinch-zoom;
}

.empty-state {
  margin: auto;
  text-align: center;
  color: var(--text-faint);
}
.empty-icon { font-size: 3rem; margin-bottom: 12px; opacity: 0.5; }
.empty-title { font-size: 1.05rem; font-weight: 600; color: var(--text-mute); margin-bottom: 4px; }
.empty-hint { font-size: 0.9rem; }

.bubble {
  max-width: 85%;
  padding: 8px 12px;
  border-radius: 14px;
  font-size: inherit;
  line-height: 1.4;
  position: relative;
  animation: bubbleIn 0.2s ease;
}

@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.bubble.original {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.bubble.translation {
  align-self: flex-end;
  background: linear-gradient(135deg, rgba(124,196,255,0.15), rgba(94,180,255,0.08));
  border: 1px solid rgba(124,196,255,0.3);
  cursor: pointer;
}

.bubble .meta {
  font-size: 0.7rem;
  color: var(--text-faint);
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.bubble .replay-btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-mute);
  width: 24px;
  height: 24px;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.bubble.error {
  align-self: center;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--bad);
  font-size: 0.88rem;
}

/* ============ controls (compact bottom row) ============ */
.controls {
  border-top: 1px solid var(--border);
  padding: 10px 16px calc(10px + var(--safe-bot));
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: rgba(11,13,16,0.92);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.ptt-btn {
  position: relative;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border: none;
  color: white;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(94,180,255,0.35);
  transition: transform 0.1s, box-shadow 0.2s;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  touch-action: none;
  flex-shrink: 0;
}
.ptt-btn:active,
.ptt-btn.active {
  transform: scale(0.94);
  background: linear-gradient(135deg, var(--ru), #ff6060);
  box-shadow: 0 6px 18px rgba(239,68,68,0.5);
}

.ptt-btn .ptt-ring {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  opacity: 0;
}
.ptt-btn.active .ptt-ring {
  opacity: 1;
  animation: pulse 1.2s infinite;
  border-color: var(--ru);
}

@keyframes pulse {
  0%   { transform: scale(1);   opacity: 0.7; }
  100% { transform: scale(1.5); opacity: 0;   }
}

/* ============ settings sheet ============ */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: flex-end;
  justify-content: center;
}
.sheet[aria-hidden="false"] { display: flex; }

.sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.sheet-body {
  position: relative;
  width: 100%;
  max-width: 540px;
  min-width: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
  border-radius: 20px 20px 0 0;
  padding: 16px 18px calc(20px + var(--safe-bot));
  /* iOS Safari needs fallbacks: dvh isn't supported on older versions */
  max-height: 90vh;
  max-height: 90dvh;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  animation: slideUp 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  box-sizing: border-box;
}
.sheet-body * { max-width: 100%; box-sizing: border-box; }
@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.sheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.sheet-header h2 { font-size: 1.2rem; font-weight: 600; }
.sheet-close {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
}

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-mute);
  margin-bottom: 6px;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-family: inherit;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.field-hint {
  font-size: 0.74rem;
  color: var(--text-faint);
  margin-top: 4px;
}
.link-btn {
  background: transparent;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.82rem;
  margin-top: 4px;
  padding: 0;
}

.radios {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.radios label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text);
  cursor: pointer;
  word-break: break-word;
  flex-wrap: wrap;
}
.radios label input[type="radio"],
.radios label input[type="checkbox"] { flex-shrink: 0; }
.radios label input[type="number"] { width: 80px; flex-shrink: 0; }

.danger-btn {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--bad);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  cursor: pointer;
}

.about {
  font-size: 0.85rem;
  color: var(--text-mute);
  line-height: 1.6;
}
.about a { color: var(--accent); text-decoration: none; }

.lang-pair {
  display: flex;
  gap: 8px;
  align-items: center;
}
.lang-pair select { flex: 1; }
.lang-pair-arrow { color: var(--text-mute); font-size: 1.1rem; }

.aux-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-mute);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}
.aux-btn:hover,
.aux-btn:active { background: var(--bg-elev); border-color: var(--accent); color: var(--accent); }
.aux-btn.active {
  background: linear-gradient(135deg, rgba(124,196,255,0.25), rgba(94,180,255,0.15));
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 2px rgba(124,196,255,0.18);
}

.bubble .replay-btn.ondemand {
  border-color: rgba(251,191,36,0.45);
  color: var(--warn);
}
.bubble .replay-btn.ondemand:hover {
  background: rgba(251,191,36,0.12);
}

.primary-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border: none;
  color: white;
  padding: 12px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.primary-btn:disabled { opacity: 0.5; cursor: wait; }

.summary-result {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 10px;
  background: rgba(124,196,255,0.08);
  border: 1px solid rgba(124,196,255,0.3);
}
.summary-text {
  font-size: 0.95rem;
  line-height: 1.55;
  white-space: pre-wrap;
  margin-bottom: 8px;
}

.clone-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.clone-row .primary-btn { width: auto; flex: 1; min-width: 180px; }
.clone-time {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.88rem;
  color: var(--text-mute);
}
#cloneRecBtn.recording {
  background: linear-gradient(135deg, var(--ru), #ff6060);
}

.log-panel {
  margin-top: 8px;
  background: #000;
  color: #b8e3a8;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.4;
  max-height: 200px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ============ desktop tweaks ============ */
@media (min-width: 768px) {
  body { font-size: 17px; }
  .conversation { max-width: 720px; margin: 0 auto; width: 100%; }
  .controls { padding: 22px 20px 28px; }
  .ptt-btn { width: 110px; height: 110px; }
}