frontend/style.css

/* ── Reset & base ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #07090f;
  --bg2: #0d1117;
  --bg3: #121820;
  --border: rgba(255, 255, 255, 0.07);
  --border2: rgba(255, 255, 255, 0.12);
  --text: #e2e8f0;
  --text2: #8892a4;
  --text3: #4a5568;
  --accent: #22d3ee;
  --accent2: #818cf8;
  --accent3: #f472b6;
  --green: #4ade80;
  --red: #f87171;
  --yellow: #fbbf24;
  --user-bg: rgba(34, 211, 238, 0.1);
  --ai-bg: rgba(129, 140, 248, 0.08);
  --sidebar-w: 270px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Hind Siliguri', 'Syne', sans-serif;
  overflow: hidden;
}

/* ── Ambient orbs ── */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
  animation: orb-float 12s ease-in-out infinite;
}
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #22d3ee, transparent);
  top: -200px; left: -150px;
  animation-delay: 0s;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #818cf8, transparent);
  bottom: -100px; right: -100px;
  animation-delay: -4s;
}
.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #f472b6, transparent);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -8s;
}
@keyframes orb-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(30px, -20px) scale(1.05); }
  66%       { transform: translate(-20px, 15px) scale(0.97); }
}

/* ── Init overlay ── */
.init-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
.init-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.init-card {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 24px;
  padding: 48px 56px;
  width: 480px;
  max-width: 95vw;
  text-align: center;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}
.init-logo {
  margin-bottom: 20px;
  animation: logo-pulse 2s ease-in-out infinite;
}
@keyframes logo-pulse {
  0%, 100% { filter: drop-shadow(0 0 12px rgba(34, 211, 238, 0.4)); transform: scale(1); }
  50%       { filter: drop-shadow(0 0 24px rgba(129, 140, 248, 0.6)); transform: scale(1.06); }
}
.init-title {
  font-family: 'Syne', sans-serif;
  font-size: 26px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}
.init-subtitle {
  font-family: 'Hind Siliguri', sans-serif;
  color: var(--text2);
  font-size: 15px;
  margin-bottom: 36px;
}
.init-stages {
  text-align: left;
  margin-bottom: 28px;
}
.stage {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  font-size: 13px;
  color: var(--text3);
  border-bottom: 1px solid var(--border);
  transition: color 0.3s;
}
.stage.active { color: var(--accent); }
.stage.done   { color: var(--green); }
.stage-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text3);
  flex-shrink: 0;
  transition: background 0.3s, box-shadow 0.3s;
}
.stage.active .stage-dot {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: blink-dot 0.8s ease-in-out infinite;
}
.stage.done .stage-dot { background: var(--green); }
@keyframes blink-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}
.stage-check {
  margin-left: auto;
  opacity: 0;
  transition: opacity 0.3s;
}
.stage.done .stage-check { opacity: 1; }
.stage span {
  flex: 1;
  font-family: 'Hind Siliguri', sans-serif;
}
.init-bar-wrap {
  background: var(--bg3);
  border-radius: 99px;
  height: 6px;
  overflow: hidden;
  margin-bottom: 16px;
  border: 1px solid var(--border);
}
.init-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 99px;
  width: 0%;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.5);
}
.init-status {
  font-size: 12px;
  color: var(--text2);
  font-family: 'JetBrains Mono', monospace;
}

/* ── App layout ──
   FIX-7: App is hidden by default via opacity/pointer-events.
   JS adds class .visible after init overlay closes. This prevents
   any flash of unstyled content (FOUC) during JS execution.
── */
.app {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}
.app.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow-y: auto;
  transition: width var(--transition), transform var(--transition);
  z-index: 10;
}
.sidebar.collapsed {
  width: 0;
  overflow: hidden;
}
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: var(--text);
}
.sidebar-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 8px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 16px;
  transition: all var(--transition);
}
.sidebar-toggle:hover {
  background: var(--border);
  color: var(--text);
}

.status-panel { padding: 16px; }
.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
}
.status-label { font-size: 12px; color: var(--text2); }
.status-badge {
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.badge-green  { background: rgba(74, 222, 128, 0.12); color: var(--green); }
.badge-yellow { background: rgba(251, 191, 36, 0.12); color: var(--yellow); }
.badge-red    { background: rgba(248, 113, 113, 0.12); color: var(--red); }

.sidebar-divider { height: 1px; background: var(--border); margin: 4px 0; }

.dash-section { padding: 16px; }
.dash-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text2);
  margin-bottom: 12px;
}
.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.metric-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  text-align: center;
}
.metric-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 4px;
}
.metric-label { font-size: 10px; color: var(--text3); }

.setting-row { margin-bottom: 14px; }
.setting-row label {
  display: block;
  font-size: 11px;
  color: var(--text2);
  margin-bottom: 6px;
}
.slider-wrap { display: flex; align-items: center; gap: 8px; }
.slider-wrap input[type='range'] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
  cursor: pointer;
}
.slider-wrap span {
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  min-width: 58px;
  text-align: right;
}
.setting-select {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  font-family: 'Hind Siliguri', sans-serif;
  cursor: pointer;
}
.setting-select:focus { outline: none; border-color: var(--accent); }

.queue-vis {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 48px;
  margin-bottom: 8px;
}
.queue-bar {
  flex: 1;
  background: var(--accent);
  border-radius: 3px;
  opacity: 0.3;
  transition: height 0.15s ease, opacity 0.15s ease;
  min-height: 4px;
}
.queue-bar.active { opacity: 0.9; }
.queue-label {
  font-size: 11px;
  color: var(--text2);
  font-family: 'JetBrains Mono', monospace;
}

/* ── Main ── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ── Topbar ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.topbar-left  { display: flex; align-items: center; gap: 12px; }
.topbar-center {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.topbar-right { display: flex; gap: 8px; }
.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 16px;
}
.state-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  flex-shrink: 0;
  transition: background 0.3s, box-shadow 0.3s;
}
.state-dot.listening  { background: var(--accent);  box-shadow: 0 0 8px var(--accent);  animation: blink-dot 0.8s infinite; }
.state-dot.recording  { background: var(--red);     box-shadow: 0 0 10px var(--red);    animation: blink-dot 0.4s infinite; }
.state-dot.processing { background: var(--yellow);  box-shadow: 0 0 8px var(--yellow);  animation: blink-dot 1s infinite; }
.state-dot.speaking   { background: var(--accent2); box-shadow: 0 0 10px var(--accent2);animation: blink-dot 0.6s infinite; }
#state-label { font-size: 13px; color: var(--text2); font-family: 'JetBrains Mono', monospace; }

.clear-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 12px;
  font-family: 'Syne', sans-serif;
  transition: all var(--transition);
}
.clear-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ── Chat ── */
#chat-box {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}
#chat-box::-webkit-scrollbar { width: 4px; }
#chat-box::-webkit-scrollbar-track { background: transparent; }
#chat-box::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

.message {
  max-width: 75%;
  padding: 14px 18px;
  border-radius: 16px;
  line-height: 1.65;
  font-size: 14.5px;
  word-wrap: break-word;
  overflow-wrap: break-word;
  animation: msg-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  font-family: 'Hind Siliguri', sans-serif;
}
@keyframes msg-in {
  from { opacity: 0; transform: translateY(10px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.message.user {
  background: var(--user-bg);
  border: 1px solid rgba(34, 211, 238, 0.2);
  margin-left: auto;
  border-bottom-right-radius: 4px;
}
.message.ai {
  background: var(--ai-bg);
  border: 1px solid rgba(129, 140, 248, 0.15);
  border-bottom-left-radius: 4px;
}
.message.system {
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.2);
  color: var(--yellow);
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  align-self: center;
  max-width: 90%;
}
.message ul, .message ol { padding-left: 20px; margin: 8px 0; }
.message li  { margin-bottom: 4px; }
.message p   { margin: 6px 0; }
.message code {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}
.message pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
}

/* ── Voice visualizer ── */
.voice-visualizer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 0;
  overflow: hidden;
  transition: height 0.3s ease;
  padding: 0 20px;
}
.voice-visualizer.active { height: 56px; }
.viz-bar {
  width: 4px;
  border-radius: 99px;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  height: 6px;
  transition: height 0.08s ease;
  flex-shrink: 0;
}

/* ── Controls ── */
.controls {
  padding: 16px 20px 20px;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.text-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  align-items: flex-end; /* FIX-4: align send button to bottom when textarea grows */
}

/* ── FIX-4: Auto-growing textarea replaces <input type="text"> ── */
#text-input {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--text);
  font-size: 14px;
  font-family: 'Hind Siliguri', sans-serif;
  outline: none;
  transition: border-color var(--transition);
  resize: none;           /* FIX-4: no manual resize handle */
  overflow-y: hidden;     /* hidden until 10 lines exceeded; JS manages */
  line-height: 1.57;      /* ~22px per line at font-size 14px */
  min-height: 44px;       /* single line min */
  max-height: 226px;      /* 10 lines × 22px + 16px padding */
  display: block;
  /* smooth height animation */
  transition: border-color var(--transition), height 0.1s ease;
}
#text-input::placeholder { color: var(--text3); }
#text-input:focus { border-color: var(--accent); }
/* Custom scrollbar inside textarea once > 10 lines */
#text-input::-webkit-scrollbar { width: 4px; }
#text-input::-webkit-scrollbar-track { background: transparent; }
#text-input::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

#send-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  color: #000;
  display: flex;
  align-items: center;
  transition: opacity var(--transition), transform 0.1s;
  flex-shrink: 0;
  align-self: flex-end; /* FIX-4: stays at bottom as textarea grows */
  height: 44px;
}
#send-btn:hover  { opacity: 0.88; }
#send-btn:active { transform: scale(0.95); }

.voice-row { display: flex; gap: 10px; }
.mic-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 20px;
  border-radius: 14px;
  border: 1.5px solid var(--border2);
  background: var(--bg3);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-family: 'Hind Siliguri', sans-serif;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.mic-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity var(--transition);
}
.mic-btn:hover::before { opacity: 0.08; }
.mic-btn.mic-listening {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(34, 211, 238, 0.2), inset 0 0 20px rgba(34, 211, 238, 0.05);
}
.mic-btn.mic-recording {
  border-color: var(--red);
  animation: pulse-red 0.8s ease-in-out infinite;
}
@keyframes pulse-red {
  0%, 100% { box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.4); }
  50%       { box-shadow: 0 0 0 8px rgba(248, 113, 113, 0); }
}
.mic-btn.mic-processing {
  border-color: var(--yellow);
  box-shadow: 0 0 0 2px rgba(251, 191, 36, 0.15);
}
.mic-icon  { font-size: 18px; position: relative; z-index: 1; }
.mic-label { position: relative; z-index: 1; }

.stop-btn {
  background: rgba(248, 113, 113, 0.1);
  border: 1.5px solid rgba(248, 113, 113, 0.3);
  color: var(--red);
  border-radius: 14px;
  padding: 13px 16px;
  cursor: pointer;
  font-size: 13px;
  font-family: 'Hind Siliguri', sans-serif;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
}
.stop-btn:hover  { background: rgba(248, 113, 113, 0.2); border-color: var(--red); }
.stop-btn:active { transform: scale(0.95); }

/* ── Scrollbar (sidebar) ── */
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

/* ── Responsive ── */
@media (max-width: 680px) {
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    transform: translateX(-100%);
    z-index: 100;
  }
  .sidebar.mobile-open { transform: translateX(0); }
  .mobile-menu-btn { display: flex; }
  .topbar-center { font-size: 13px; }
  .message { max-width: 90%; font-size: 14px; }
}

/* ── Thinking bubble (animated "..." while AI processes) ── */
.message.thinking {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 12px 16px;
  background: var(--ai-bg);
  border: 1px solid var(--border);
  border-radius: 16px 16px 16px 4px;
  align-self: flex-start;
  max-width: 80px;
}
.message.thinking .dot {
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent2);
  opacity: 0.4;
  animation: dot-bounce 1.2s ease-in-out infinite;
}
.message.thinking .dot:nth-child(2) { animation-delay: 0.2s; }
.message.thinking .dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes dot-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40%            { transform: translateY(-6px); opacity: 1; }
}