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

:root {
  --bg:        #0d0d0f;
  --surface:   #16161a;
  --border:    #2a2a30;
  --accent:    #7c6df0;
  --danger:    #e05c6a;
  --text:      #e8e8f0;
  --muted:     #6b6b80;
  --green:     #4ade80;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem;
}

/* ── Header ── */
header {
  text-align: center;
  margin-bottom: 2.5rem;
}
header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
header p {
  margin-top: 0.4rem;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Card ── */
.card {
  width: 100%;
  max-width: 720px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

/* ── Visualizer ── */
.visualizer-wrap {
  padding: 1.5rem 1.5rem 0;
}
#visualizer {
  width: 100%;
  height: 72px;
  border-radius: 8px;
  background: var(--bg);
  display: block;
}

/* ── Controls ── */
.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.source-selector {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.source-selector:focus-within {
  border-color: var(--primary);
}

.source-selector label {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
}

.source-selector select {
  background: transparent;
  border: none;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  padding-right: 0.5rem;
}

.source-selector select option {
  background: #1e1e24;
  color: #fff;
}

.record-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  outline: none;
}
.record-btn:active { transform: scale(0.97); }

#startBtn { background: var(--accent); color: #fff; }
#startBtn:hover:not(:disabled) { background: #9180f4; }

#stopBtn { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
#stopBtn:hover:not(:disabled) { background: rgba(224, 92, 106, 0.1); }

.record-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}
#startBtn .dot { background: #fff; }
#stopBtn .dot  { background: var(--danger); animation: pulse 1.2s ease-in-out infinite; }

/* ── Status pill ── */
.status-pill {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.status-pill .indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  transition: background 0.3s;
}
.status-pill.recording .indicator {
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  animation: pulse 1.2s ease-in-out infinite;
}
.status-pill.recording { color: var(--green); }

/* ── Tab nav ── */
.tab-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.75rem 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.4rem 0.85rem;
  border-radius: 6px 6px 0 0;
  letter-spacing: 0.02em;
  transition: color 0.2s, background 0.2s;
  position: relative;
  bottom: -1px;
  border-bottom: 2px solid transparent;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

#clearBtn {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}
#clearBtn:hover { color: var(--text); background: var(--border); }

/* ── Tab panels ── */
.tab-panel {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}
.tab-panel.active {
  display: block;
}

/* ── Stream tab ── */
#streamOutput {
  min-height: 320px;
  max-height: 480px;
  overflow-y: auto;
  padding: 1rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  scroll-behavior: smooth;
}
#streamOutput::-webkit-scrollbar { width: 4px; }
#streamOutput::-webkit-scrollbar-track { background: transparent; }
#streamOutput::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.entry {
  display: flex;
  gap: 0.8rem;
  align-items: baseline;
  padding: 0.6rem 0.85rem;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  animation: entrySlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  transition: border-color 0.3s ease;
}
.entry:hover {
  border-color: rgba(124, 109, 240, 0.4);
}
.entry .ts {
  font-size: 0.72rem;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.entry .lang {
  font-size: 0.68rem;
  color: var(--accent);
  background: rgba(124, 109, 240, 0.12);
  border: 1px solid rgba(124, 109, 240, 0.25);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  white-space: nowrap;
  flex-shrink: 0;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.entry .txt {
  font-size: 0.97rem;
  line-height: 1.55;
  color: var(--text);
}

/* ── Live Chat tab ── */
#liveOutput {
  min-height: 320px;
  max-height: 480px;
  overflow-y: auto;
  padding: 1.2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  scroll-behavior: smooth;
}
#liveOutput::-webkit-scrollbar { width: 4px; }
#liveOutput::-webkit-scrollbar-track { background: transparent; }
#liveOutput::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.chat-bubble {
  max-width: 85%;
  padding: 0.85rem 1.15rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  border-bottom-left-radius: 4px;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  align-self: flex-start;
  animation: bubblePop 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.chat-bubble .time {
  display: block;
  font-size: 0.65rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
  font-weight: 500;
  opacity: 0.8;
}

/* ── Live segment card (below main card) ── */
.live-segment-card {
  width: 100%;
  max-width: 720px;
  margin-top: 0.75rem;
  padding: 0.7rem 1.25rem;
  background: var(--surface);
  border: 1px solid rgba(124, 109, 240, 0.3);
  border-radius: 12px;
  display: none;
  align-items: center;
  gap: 0.75rem;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 8px 24px rgba(124, 109, 240, 0.1);
}
.live-segment-card.visible {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}
.live-segment-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(124, 109, 240, 0.12);
  border: 1px solid rgba(124, 109, 240, 0.25);
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
  white-space: nowrap;
  flex-shrink: 0;
}
#liveDraft {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.15rem;
  flex: 1;
}
.live-draft-word {
  font-size: 1.25rem;
  font-weight: 500;
  display: inline-block;
  color: var(--text); /* 穩定狀態預設為普通白字 */
  /* FLIP 動畫與顏色老化的過渡設定 */
  transition: transform 0.35s cubic-bezier(0.25, 1, 0.5, 1), color 0.35s ease, text-shadow 0.35s ease, opacity 0.35s ease;
}

/* 年齡狀態：只改變外觀，不改變 transform，以免與 JS FLIP 衝突 */
.live-draft-word.age-0 { 
  color: var(--accent);
  text-shadow: 0 0 12px rgba(124, 109, 240, 0.6);
}
.live-draft-word.age-1 { 
  color: var(--accent); 
  text-shadow: 0 0 4px rgba(124, 109, 240, 0.2);
}
/* age-2 及以上會自然繼承基礎的 var(--text) 顏色，不再強制變透明 */

#liveDraft::after {
  content: '▋';
  color: var(--accent);
  font-size: 1.1rem;
  margin-left: 4px;
  animation: blink 0.8s step-end infinite;
  text-shadow: 0 0 8px rgba(124, 109, 240, 0.8);
  position: relative;
  top: -2px;
}

/* 全新單字的彈出動畫 (只由 JS 賦予) */
@keyframes techPop {
  0%   { opacity: 0; transform: translateX(24px) scale(0.88); filter: blur(4px); }
  100% { opacity: 1; transform: translateX(0)    scale(1);    filter: blur(0); }
}

/* ── Transcript tab ── */
.transcript-toolbar {
  display: flex;
  justify-content: flex-end;
  padding: 0.6rem 1.5rem 0;
}
#copyBtn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.25rem 0.7rem;
  border-radius: 5px;
  transition: all 0.2s ease;
}
#copyBtn:hover { color: var(--text); border-color: var(--muted); background: rgba(255,255,255,0.03); }
#copyBtn.copied { color: var(--green); border-color: var(--green); background: rgba(74, 222, 128, 0.05); }

#transcriptOutput,
#karaokeOutput {
  min-height: 320px;
  max-height: 480px;
  overflow-y: auto;
  padding: 0.75rem 1.5rem 1.5rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}
#transcriptOutput::-webkit-scrollbar,
#karaokeOutput::-webkit-scrollbar { width: 4px; }
#transcriptOutput::-webkit-scrollbar-track,
#karaokeOutput::-webkit-scrollbar-track { background: transparent; }
#transcriptOutput::-webkit-scrollbar-thumb,
#karaokeOutput::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.karaoke-word {
  display: inline-block;
  color: var(--muted);
  transition: color 0.4s ease, text-shadow 0.4s ease, transform 0.4s ease;
  padding: 0 1px;
}
.karaoke-word.highlight {
  color: var(--text);
  text-shadow: 0 0 8px rgba(124, 109, 240, 0.3);
}
.karaoke-word.recent {
  color: var(--accent);
  font-weight: 500;
  animation: wordReveal 0.35s cubic-bezier(0.23, 1, 0.32, 1) forwards;
}

/* 已確認的句子（從 draft 退場後的最終版本） */
.confirmed-sentence {
  display: inline;
  color: var(--text);
  animation: fadeIn 0.4s ease forwards;
}

/* blinking cursor when recording */
#transcriptOutput.recording::after {
  content: '▋';
  color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ── Shared placeholder ── */
.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 280px;
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  animation: fadeIn 0.8s ease;
}

/* ── Settings button ── */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}
.icon-btn:hover { color: var(--text); border-color: var(--muted); background: rgba(255,255,255,0.04); }
.icon-btn.active { color: var(--accent); border-color: var(--accent); }

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: min(420px, calc(100vw - 2rem));
  overflow: hidden;
  transform: translateY(12px) scale(0.97);
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.modal-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.modal-close {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}
.modal-close:hover { color: var(--text); background: var(--border); }
.modal-body {
  padding: 0.5rem 0;
}

/* ── Setting rows ── */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  gap: 1rem;
}
.setting-row + .setting-row {
  border-top: 1px solid var(--border);
}
.setting-sub {
  padding-left: 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  overflow: hidden;
  max-height: 60px;
  transition: max-height 0.25s ease, opacity 0.25s ease, padding 0.25s ease;
  opacity: 1;
}
.setting-sub.hidden {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
}
.setting-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.setting-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
}
.setting-desc {
  font-size: 0.75rem;
  color: var(--muted);
}

/* ── Toggle switch ── */
.toggle-switch {
  position: relative;
  flex-shrink: 0;
  cursor: pointer;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}
.toggle-knob {
  display: block;
  width: 42px;
  height: 24px;
  background: var(--border);
  border-radius: 999px;
  position: relative;
  transition: background 0.2s ease;
}
.toggle-knob::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.toggle-switch input:checked + .toggle-knob {
  background: var(--accent);
}
.toggle-switch input:checked + .toggle-knob::after {
  transform: translateX(18px);
}

/* ── Language select ── */
.lang-select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.85rem;
  padding: 0.35rem 0.65rem;
  border-radius: 7px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}
.lang-select:focus { border-color: var(--accent); }
.lang-select option { background: #1e1e24; }

.api-key-input {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.82rem;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  padding: 0.35rem 0.65rem;
  border-radius: 7px;
  outline: none;
  width: 200px;
  transition: border-color 0.2s;
}
.api-key-input:focus { border-color: var(--accent); }
.api-key-input::placeholder { color: var(--muted); }

/* ── Bubble translation ── */
.chat-bubble .translation {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.45rem;
  padding-top: 0.45rem;
  border-top: 1px solid var(--border);
  line-height: 1.5;
  animation: fadeIn 0.3s ease;
}
.chat-bubble .translation.loading::after {
  content: ' ···';
  animation: blink 1s step-end infinite;
}

/* ── Footer ── */
footer {
  margin-top: 1.5rem;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}

/* ── Animations ── */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.4; transform: scale(0.7); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes entranceFade {
  from { opacity: 0; transform: translateY(15px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes labelGlow {
  0%, 100% { box-shadow: 0 0 0px rgba(124, 109, 240, 0); border-color: rgba(124, 109, 240, 0.25); }
  50% { box-shadow: 0 0 10px rgba(124, 109, 240, 0.2); border-color: rgba(124, 109, 240, 0.5); }
}

@keyframes placeholderBreathe {
  0%, 100% { opacity: 0.5; transform: scale(0.98); }
  50% { opacity: 0.8; transform: scale(1); }
}

@keyframes bubblePop {
  0% { opacity: 0; transform: scale(0.8) translateY(20px); }
  70% { transform: scale(1.02) translateY(-2px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes entrySlideIn {
  from { opacity: 0; transform: translateX(-15px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes wordReveal {
  from { opacity: 0; transform: translateY(6px) scale(0.9); filter: blur(4px); }
  to { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}