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

:root {
  --bg: #f5f3ef;
  --pane-bg: #ffffff;
  --pane-alt: #faf8f5;
  --bubble-alt: #edeae3;
  --border: #e3e0d9;
  --text: #2b2a27;
  --muted: #8a877f;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --bubble-grad-a: #3b82f6;
  --bubble-grad-b: #2563eb;
  --del: #b91c1c;
  --del-bg: #fee2e2;
  --ins: #15803d;
  --ins-bg: #dcfce7;
  --soft: #b45309;
  --soft-bg: #fef3c7;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 14px rgba(0, 0, 0, 0.04);
  --shadow-lift: 0 2px 6px rgba(0, 0, 0, 0.08), 0 8px 24px rgba(0, 0, 0, 0.07);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151412;
    --pane-bg: #1e1d1a;
    --pane-alt: #232220;
    --bubble-alt: #2c2b27;
    --border: #353430;
    --text: #e9e7e2;
    --muted: #9c998f;
    --accent: #5b94f5;
    --accent-hover: #7caaf8;
    --bubble-grad-a: #2f6fe0;
    --bubble-grad-b: #2459c4;
    --del: #f87171;
    --del-bg: rgba(185, 28, 28, 0.22);
    --ins: #4ade80;
    --ins-bg: rgba(21, 128, 61, 0.22);
    --soft: #fbbf24;
    --soft-bg: rgba(180, 83, 9, 0.22);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 14px rgba(0, 0, 0, 0.25);
    --shadow-lift: 0 2px 6px rgba(0, 0, 0, 0.35), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

html { color-scheme: light dark; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

button { font-family: inherit; }

/* ---- Main layout ---- */
.main {
  display: flex;
  flex-direction: column;
  height: 100vh;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--pane-bg);
  box-shadow: var(--shadow);
  z-index: 1;
}
.situation-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0; /* let the label ellipsize instead of pushing the controls off */
}
.situation-label {
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.situation-input {
  flex: 1;
  min-width: 0;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 4px 8px;
}
.situation-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.header-controls { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

/* Settings gear + popover */
.settings-wrap { position: relative; }
.icon-btn {
  flex-shrink: 0;
  padding: 6px 9px;
  font-size: 15px;
  line-height: 1;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 9px;
  cursor: pointer;
  color: var(--muted);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.settings-popup {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 20;
  min-width: 250px;
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lift);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  animation: rise-in 0.16s ease-out;
}
.settings-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.setting {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}
.setting-row { justify-content: space-between; }
.setting-row > span { display: flex; align-items: center; gap: 6px; }
.setting input { accent-color: var(--accent); }
.setting-col {
  flex-direction: column;
  align-items: stretch;
  gap: 5px;
  cursor: default;
}
.setting-hint { color: var(--muted); opacity: 0.75; font-weight: 400; }
.setting-input {
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 6px 8px;
  width: 100%;
  box-sizing: border-box;
}
.setting-input:focus { outline: none; border-color: var(--accent); }
.settings-note {
  font-size: 11px;
  line-height: 1.45;
  color: var(--muted);
  margin: -2px 0 2px;
}
.settings-note code {
  font-size: 10.5px;
  background: var(--pane-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 3px;
}
.setting-details { font-size: 13px; }
.setting-details > summary {
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  padding: 2px 0;
}
.setting-details > summary:hover { color: var(--accent); }
.setting-details[open] {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 4px;
}
.setting-key {
  font-family: inherit;
  font-size: 11px;
  color: var(--muted);
  background: var(--pane-alt);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
}
.setting select {
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 4px 6px;
}
.cost-ticker {
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  background: var(--pane-alt);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 5px 10px;
  cursor: default;
}
header button {
  padding: 7px 14px;
  font-size: 13px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 9px;
  cursor: pointer;
  color: var(--muted);
  transition: border-color 0.15s ease, color 0.15s ease;
}
header button:hover { border-color: var(--accent); color: var(--accent); }

.panes {
  display: flex;
  flex: 1;
  min-height: 0;
}
.pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 16px;
}
.chat-pane { flex: 3; border-right: 1px solid var(--border); }
.tutor-pane { flex: 2; background: var(--pane-alt); }

.messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 6px 4px 12px;
  scroll-behavior: smooth;
}
.messages::-webkit-scrollbar { width: 8px; }
.messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.messages::-webkit-scrollbar-thumb:hover { background: var(--muted); }

.input-row { display: flex; gap: 8px; padding-top: 12px; }
.input-row input {
  flex: 1;
  padding: 12px 15px;
  font-size: 15px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--pane-bg);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.input-row input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.input-row button {
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease, opacity 0.15s ease;
}
.input-row button:hover:not(:disabled) { background: var(--accent-hover); }
.input-row button:active:not(:disabled) { transform: scale(0.97); }
.input-row button:disabled { opacity: 0.45; cursor: default; }

/* Voice-input (🎤) button — sits between the input and Send */
.mic-btn {
  flex-shrink: 0;
  padding: 0 14px;
  font-size: 17px;
  line-height: 1;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  color: var(--muted);
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.mic-btn:hover { border-color: var(--accent); color: var(--accent); }
.mic-btn.recording {
  color: #fff;
  background: var(--del);
  border-color: var(--del);
  animation: mic-pulse 1.3s ease-in-out infinite;
}
@keyframes mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--del) 45%, transparent); }
  50% { box-shadow: 0 0 0 5px color-mix(in srgb, var(--del) 0%, transparent); }
}
body.no-stt .mic-btn { display: none; }

/* ---- Chat bubbles ---- */
@keyframes rise-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.msg {
  max-width: 85%;
  animation: rise-in 0.28s ease-out;
}
.msg.user { align-self: flex-end; }
.msg.teacher { align-self: flex-start; }

.bubble {
  padding: 10px 15px;
  border-radius: 16px;
  font-size: 15px;
  line-height: 1.5;
}
.msg.user .bubble {
  background: linear-gradient(135deg, var(--bubble-grad-a), var(--bubble-grad-b));
  color: white;
  border-bottom-right-radius: 5px;
  box-shadow: var(--shadow);
}
.msg.teacher .bubble {
  background: var(--bubble-alt);
  border-bottom-left-radius: 5px;
}

/* Correction block under a user message */
.correction {
  margin-top: 7px;
  padding: 10px 13px;
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.65;
  box-shadow: var(--shadow);
  animation: rise-in 0.35s ease-out;
}
.correction .diff-line { margin-bottom: 3px; }
.correction .ok { color: var(--ins); font-size: 13px; }
.correction .natural { font-size: 14px; margin-top: 2px; }
/* (learner_translation stays in the schema/log; just not rendered) */
.correction .natural-label {
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 600;
}

del {
  color: var(--del);
  background: var(--del-bg);
  text-decoration: line-through;
  border-radius: 4px;
  padding: 0 3px;
}
ins {
  color: var(--ins);
  background: var(--ins-bg);
  text-decoration: none;
  border-radius: 4px;
  padding: 0 3px;
}
.soft-fix {
  color: var(--soft);
  background: var(--soft-bg);
  border-radius: 4px;
  padding: 0 3px;
}

.notes-toggle,
.en-toggle {
  display: inline-block;
  margin-top: 5px;
  font-size: 12.5px;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  transition: color 0.15s ease;
}
.en-toggle { color: var(--muted); font-size: 12px; }
.notes-toggle:hover, .en-toggle:hover { text-decoration: underline; }

.notes-body {
  margin-top: 5px;
  font-size: 13.5px;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  padding-top: 7px;
  animation: rise-in 0.2s ease-out;
}
.en-body {
  margin-top: 4px;
  font-size: 13.5px;
  color: var(--muted);
  font-style: italic;
  animation: rise-in 0.2s ease-out;
}

/* Tutor messages */
.tutor-pane .msg.user .bubble {
  background: var(--bubble-alt);
  color: var(--text);
  box-shadow: none;
}
.tutor-pane .msg.teacher .bubble {
  background: var(--pane-bg);
  border: 1px solid var(--border);
}
.tutor-pane .bubble { white-space: pre-wrap; }

/* ---- Typing indicator ---- */
.typing {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 13px 16px;
  background: var(--bubble-alt);
  border-radius: 16px;
  border-bottom-left-radius: 5px;
  animation: rise-in 0.25s ease-out;
}
.typing .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  animation: dot-bounce 1.2s infinite ease-in-out;
}
.typing .dot:nth-child(2) { animation-delay: 0.15s; }
.typing .dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes dot-bounce {
  0%, 60%, 100% { transform: none; opacity: 0.35; }
  30% { transform: translateY(-5px); opacity: 1; }
}

.error-msg {
  align-self: center;
  color: var(--del);
  font-size: 13px;
  background: var(--del-bg);
  padding: 7px 14px;
  border-radius: 9px;
  animation: rise-in 0.25s ease-out;
}
.retry-link {
  margin-left: 10px;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

/* ---- TTS speak buttons ---- */
.speak-btn {
  background: none;
  border: none;
  padding: 0 2px;
  margin-left: 6px;
  font-size: 0.85em;
  line-height: 1;
  cursor: pointer;
  opacity: 0.45;
  vertical-align: baseline;
  transition: opacity 0.15s ease;
}
.speak-btn:hover { opacity: 1; }
.speak-btn.playing { opacity: 1; }
.speak-btn.loading { animation: speak-pulse 1s ease-in-out infinite; }
@keyframes speak-pulse {
  50% { opacity: 0.15; }
}
body.no-tts .speak-btn { display: none; }
body.no-tts .tts-only { display: none; }

/* ---- Onboarding modal ---- */
.onb-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: onb-fade 0.18s ease-out;
}
@keyframes onb-fade { from { opacity: 0; } to { opacity: 1; } }
.onb-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lift);
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: rise-in 0.18s ease-out;
}
.onb-close {
  position: absolute;
  top: 10px;
  right: 13px;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
  color: var(--muted);
}
.onb-close:hover { color: var(--accent); }
.onb-title { font-size: 20px; font-weight: 650; line-height: 1.25; }
.onb-lead { font-size: 14px; line-height: 1.5; color: var(--text); }
.onb-note { font-size: 12.5px; line-height: 1.5; color: var(--muted); }
.onb-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 13px;
  color: var(--muted);
}
.onb-input,
#onbProvider {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
  width: 100%;
  box-sizing: border-box;
}
.onb-input:focus,
#onbProvider:focus {
  outline: none;
  border-color: var(--accent);
}
#onbFields { display: flex; flex-direction: column; gap: 14px; }
.onb-hint { font-size: 12px; color: var(--muted); margin-top: -3px; }
.onb-hint a { color: var(--accent); text-decoration: none; }
.onb-hint a:hover { text-decoration: underline; }
.onb-opt { opacity: 0.7; }
.onb-start {
  margin-top: 4px;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.onb-start:hover:not(:disabled) { background: var(--accent-hover); }
.onb-start:disabled { opacity: 0.45; cursor: default; }
.onb-fine { font-size: 11.5px; line-height: 1.45; color: var(--muted); }