:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1b1f24;
  --muted: #5f6b7a;
  --border: #dde2e8;
  --accent: #0f766e;
  --accent-soft: #e0f2ef;
  --user: #0f766e;
  --user-text: #ffffff;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --danger: #b42318;
  --robot-body: #dfe7ee;
  --robot-edge: #9fb0c0;
  --robot-face: #0f1b2a;
  --robot-glow: #2dd4bf;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116;
    --surface: #171b22;
    --text: #e6e9ee;
    --muted: #97a3b3;
    --border: #2a313c;
    --accent: #2dd4bf;
    --accent-soft: #123a36;
    --user: #14b8a6;
    --user-text: #04201d;
    --code-bg: #0b0f16;
    --code-text: #d7dee8;
    --danger: #f97066;
    --robot-body: #2a3441;
    --robot-edge: #4b5a6b;
    --robot-face: #070b11;
    --robot-glow: #2dd4bf;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Nastaliq Urdu", sans-serif;
  display: flex;
  flex-direction: column;
}
button { font: inherit; cursor: pointer; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 1.05rem; margin: 0; }
.brand .sub { margin: 0; font-size: .8rem; color: var(--muted); }
.dot { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.top-actions { display: flex; gap: 8px; align-items: center; }

.ghost {
  background: transparent; color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px;
}
.ghost:hover { border-color: var(--accent); }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg-btn { border: 0; background: transparent; color: var(--text); padding: 6px 10px; }
.seg-btn.active { background: var(--accent); color: var(--surface); }

.modes {
  display: flex; gap: 8px; padding: 10px 16px; overflow-x: auto;
  border-bottom: 1px solid var(--border); scrollbar-width: thin;
}
.chip {
  white-space: nowrap; border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 999px; padding: 5px 12px; font-size: .88rem;
}
.chip:hover { border-color: var(--accent); background: var(--accent-soft); }

.transcript {
  flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px;
  max-width: 860px; width: 100%; margin: 0 auto;
}
.empty { margin: auto; text-align: center; color: var(--muted); max-width: 520px; }
.empty .big { font-size: 1.3rem; color: var(--text); margin-bottom: 4px; }

.msg { max-width: 88%; padding: 10px 14px; border-radius: 14px; overflow-wrap: anywhere; }
.msg.user { align-self: flex-end; background: var(--user); color: var(--user-text); border-bottom-right-radius: 4px; }
.msg.assistant { align-self: flex-start; background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.info { align-self: center; background: transparent; color: var(--muted); font-size: .85rem; padding: 2px; }
.msg.error { align-self: center; color: var(--danger); font-size: .9rem; }
.msg p { margin: 0 0 8px; }
.msg p:last-child { margin-bottom: 0; }
.msg pre {
  background: var(--code-bg); color: var(--code-text); padding: 10px 12px; border-radius: 8px;
  overflow-x: auto; font-size: .85rem; margin: 8px 0;
}
.msg code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.msg :not(pre) > code { background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
.msg[dir="rtl"] { text-align: right; }

.status {
  text-align: center; color: var(--muted); font-size: .85rem; padding: 4px 16px;
}

.composer {
  background: var(--surface); border-top: 1px solid var(--border); padding: 10px 16px 14px;
}
.input-row { display: flex; gap: 8px; align-items: center; max-width: 860px; margin: 0 auto; }
.input-row input {
  flex: 1; min-width: 0; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: inherit;
}
.icon { width: 42px; height: 42px; padding: 0; display: grid; place-items: center; }
.mic {
  width: 56px; height: 56px; border-radius: 50%; border: 0; background: var(--accent); color: #fff;
  font-size: 1.4rem; flex-shrink: 0; transition: transform .15s;
}
.mic.listening { background: var(--danger); animation: pulse 1.2s infinite; }
.mic:disabled { opacity: .4; cursor: not-allowed; }
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.08); } }
.handsfree { display: block; max-width: 860px; margin: 0 auto 6px; font-size: .85rem; color: var(--muted); }
.hint { text-align: center; font-size: .8rem; color: var(--muted); margin: 6px 0 0; }

.panel {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(420px, 100%);
  background: var(--surface); border-left: 1px solid var(--border); padding: 16px; overflow-y: auto;
  box-shadow: -8px 0 24px rgba(0,0,0,.12); z-index: 10;
}
.panel-head { display: flex; justify-content: space-between; align-items: center; }
.panel h2 { font-size: 1.1rem; margin: 0; }
.panel h3 { font-size: .95rem; margin: 18px 0 6px; }
.panel ul { list-style: none; padding: 0; margin: 0; }
.panel li { padding: 6px 0; border-bottom: 1px solid var(--border); font-size: .9rem; }
.level { float: right; font-size: .78rem; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.muted { color: var(--muted); font-size: .85rem; }

/* ---------- Footer credit ---------- */
.credit { text-align: center; font-size: .78rem; color: var(--muted); margin: 8px 0 0; }
.credit b { color: var(--text); font-weight: 600; }

/* ---------- One-to-one call ---------- */
.call-btn { white-space: nowrap; }
.call {
  position: fixed; inset: 0; z-index: 20; background: var(--bg);
  display: flex; flex-direction: column; align-items: center;
  padding: 12px 16px calc(14px + env(safe-area-inset-bottom));
  overflow-y: auto;
}
.call-top { width: 100%; max-width: 520px; display: flex; justify-content: space-between; align-items: center; }
.call-top h2 { margin: 0; font-size: 1.1rem; }
.call-top .sub { margin: 0; font-size: .8rem; color: var(--muted); }
.end-btn {
  border: 0; border-radius: 999px; padding: 8px 18px; background: var(--danger); color: #fff; font-weight: 600;
}

.robot-wrap {
  position: relative; margin: auto 0 8px; border: 0; background: transparent; padding: 0;
  width: min(62vw, 300px); aspect-ratio: 200 / 230; cursor: pointer; flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}
.robot { position: relative; width: 100%; height: 100%; overflow: visible; }
.ring {
  --level: 0;
  position: absolute; left: 50%; top: 46%; width: 96%; aspect-ratio: 1; border-radius: 50%;
  transform: translate(-50%, -50%) scale(calc(0.9 + var(--level) * 0.35));
  background: radial-gradient(circle, color-mix(in srgb, var(--robot-glow) 28%, transparent) 0%, transparent 68%);
  opacity: 0; transition: opacity .3s, transform .08s linear;
}

.robot .head, .robot .body { fill: var(--robot-body); stroke: var(--robot-edge); stroke-width: 3; }
.robot .ear, .robot .neck { fill: var(--robot-edge); }
.robot .antenna { stroke: var(--robot-edge); stroke-width: 4; stroke-linecap: round; }
.robot .bulb { fill: var(--robot-edge); }
.robot .face { fill: var(--robot-face); }
.robot .eye { fill: var(--robot-glow); transform-box: fill-box; transform-origin: center; animation: blink 4.5s infinite; }
.robot .bar { fill: var(--robot-glow); transform-box: fill-box; transform-origin: center; transform: scaleY(.45); }
.robot .core { fill: var(--robot-edge); }

@keyframes blink { 0%, 94%, 100% { transform: scaleY(1); } 97% { transform: scaleY(.1); } }
@keyframes talk { 0%, 100% { transform: scaleY(.45); } 50% { transform: scaleY(2.4); } }
@keyframes bulb { 0%, 100% { fill: var(--robot-edge); } 50% { fill: var(--robot-glow); } }
@keyframes look { 0%, 100% { transform: translateX(-5px); } 50% { transform: translateX(5px); } }
@keyframes glow { 0%, 100% { opacity: .55; } 50% { opacity: 1; } }

/* listening: ring follows mic level, ears and bulb light up */
.call[data-state="listening"] .ring { opacity: 1; }
.call[data-state="listening"] .ear,
.call[data-state="listening"] .bulb { fill: var(--robot-glow); }
.call[data-state="listening"] .eye { transform: scaleY(1.15); animation: none; }

/* thinking: antenna blinks, eyes look around */
.call[data-state="thinking"] .bulb { animation: bulb .8s infinite; }
.call[data-state="thinking"] .eyes { animation: look 1.4s ease-in-out infinite; }

/* speaking: mouth bars move, chest core glows */
.call[data-state="speaking"] .bar { animation: talk .5s ease-in-out infinite; }
.call[data-state="speaking"] .bar:nth-child(2) { animation-delay: .12s; }
.call[data-state="speaking"] .bar:nth-child(3) { animation-delay: .24s; }
.call[data-state="speaking"] .bar:nth-child(4) { animation-delay: .06s; }
.call[data-state="speaking"] .bar:nth-child(5) { animation-delay: .18s; }
.call[data-state="speaking"] .core { fill: var(--robot-glow); animation: glow .9s infinite; }

.call-status { margin: 4px 0 8px; color: var(--muted); font-size: .95rem; text-align: center; min-height: 1.4em; }
.captions { width: 100%; max-width: 520px; min-height: 4.5em; }
.cap { margin: 0 0 6px; font-size: .95rem; line-height: 1.45; text-align: center;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.cap.you { color: var(--muted); }
.cap.tutor { color: var(--text); }
.cap:empty { display: none; }
.call-talk {
  margin: 10px 0 auto; border: 0; border-radius: 999px; padding: 14px 28px; min-width: 200px;
  background: var(--accent); color: var(--surface); font-weight: 600; font-size: 1rem;
}
.call[data-state="listening"] .call-talk { background: var(--danger); color: #fff; }

@media (prefers-reduced-motion: reduce) {
  .robot .eye, .call[data-state] .bar, .call[data-state] .bulb, .call[data-state] .eyes, .call[data-state] .core { animation: none !important; }
  .call[data-state="speaking"] .bar { transform: scaleY(1.6); }
}

/* Header buttons: never squash labels; wrap to a second row on narrow phones */
.top-actions { flex-wrap: wrap; justify-content: flex-end; }
.ghost, .seg-btn { white-space: nowrap; }
@media (max-width: 480px) {
  .topbar { gap: 8px; }
  .top-actions { gap: 6px; width: 100%; justify-content: flex-start; }
  .top-actions .ghost, .seg-btn { padding: 6px 9px; font-size: .9rem; }
}

/* ---------- Study library ---------- */
.panel.library { width: min(520px, 100%); z-index: 11; }
.lib-search {
  width: 100%; margin: 8px 0; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: inherit;
}
.lib-subjects { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.lib-subjects .chip[aria-pressed="true"] { background: var(--accent); color: var(--surface); border-color: var(--accent); }
.lib-topic { border: 1px solid var(--border); border-radius: 12px; margin: 10px 0; overflow: hidden; }
.lib-topic > summary {
  list-style: none; cursor: pointer; padding: 10px 12px; display: flex; justify-content: space-between;
  align-items: center; gap: 8px; font-weight: 600;
}
.lib-topic > summary::-webkit-details-marker { display: none; }
.lib-topic > summary .meta { font-weight: 400; font-size: .78rem; color: var(--muted); white-space: nowrap; }
.lib-topic[open] > summary { border-bottom: 1px solid var(--border); background: var(--accent-soft); }
.lib-inner { padding: 8px 12px 12px; }
.lib-inner h4 { margin: 10px 0 4px; font-size: .85rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.lib-inner ul.points { padding-left: 18px; margin: 0; list-style: disc; }
.lib-inner ul.points li { border: 0; padding: 2px 0; }
.lib-inner pre { background: var(--code-bg); color: var(--code-text); padding: 8px 10px; border-radius: 8px; overflow-x: auto; font-size: .8rem; margin: 4px 0; white-space: pre-wrap; }
.qa { border-top: 1px dashed var(--border); padding: 8px 0; }
.qa > summary { cursor: pointer; font-size: .92rem; }
.qa .lvl { font-size: .72rem; color: var(--muted); margin-left: 4px; }
.qa .answer { margin: 6px 0; font-size: .9rem; line-height: 1.5; }
.qa-actions { display: flex; gap: 8px; }
.qa-actions button { font-size: .82rem; padding: 5px 10px; }
.lib-topic-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.lib-topic-actions button { font-size: .82rem; padding: 5px 10px; }

/* ---------- Installed app (home screen): keep content clear of the notch and home bar ---------- */
.topbar { padding-top: calc(10px + env(safe-area-inset-top)); padding-left: calc(16px + env(safe-area-inset-left)); padding-right: calc(16px + env(safe-area-inset-right)); }
.composer { padding-bottom: calc(14px + env(safe-area-inset-bottom)); }
.call { padding-top: calc(12px + env(safe-area-inset-top)); }
.panel { padding-top: calc(16px + env(safe-area-inset-top)); padding-bottom: calc(16px + env(safe-area-inset-bottom)); }
@media (display-mode: standalone) {
  html, body { overscroll-behavior: none; }
  body { -webkit-user-select: none; user-select: none; }
  input, textarea, .msg, .answer, .lib-inner { -webkit-user-select: text; user-select: text; }
}

/* ---------- HD voice (ElevenLabs) controls ---------- */
.toggles { display: flex; gap: 16px; flex-wrap: wrap; max-width: 860px; margin: 0 auto 6px; }
.toggles .handsfree { margin: 0; }
.call-top { gap: 8px; }
.call-top > div { flex: 1; }
.hd-btn { font-size: .82rem; padding: 6px 10px; white-space: nowrap; }
.hd-btn[aria-pressed="false"] { opacity: .6; }

/* ---------- Voice settings ---------- */
.toggles { align-items: center; }
.voice-btn { font-size: .82rem; padding: 4px 10px; }
.panel .field { display: block; margin: 18px 0 6px; font-size: .9rem; font-weight: 600; }
.panel .field-input {
  width: 100%; padding: 10px; font-size: 1rem; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.panel input[type="range"] { width: 100%; accent-color: var(--accent); }
.test-btn {
  display: block; width: 100%; margin: 18px 0 10px; padding: 12px; font-size: 1rem; font-weight: 600;
  border: 0; border-radius: 12px; background: var(--accent); color: #fff; cursor: pointer;
}
.panel .small { font-size: .8rem; line-height: 1.45; }
.call-top h2 { white-space: nowrap; }
.call-top { gap: 6px; }
.call-top > div { min-width: 0; }
.call-top .hd-btn { padding: 6px 8px; }
.end-btn { flex-shrink: 0; }
@media (max-width: 400px) { .call-top h2 { font-size: 1rem; } }
.voice-group { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 4px; }
.voice-group h3 { margin: 12px 0 0; }
.voice-row[hidden] { display: none; }
.voice-group .test-btn { margin: 14px 0 6px; }
.voice-row.chosen .field::after { content: " ✓ in use"; color: var(--accent); font-weight: 600; }