:root {
  /* ---- Restored light-blue-tint palette (preferred GIIS9new base) ----
     Original bright accents kept; refinement lives in HIERARCHY + spacing,
     not in recolouring. All PRIMARY buttons use the blue->emerald gradient. */

  --navy: #071b33;
  --navy-2: #0a2a4a;

  --blue: #2d6cdf;
  --emerald: #00a77f;
  --lime: #a2ff86;

  /* signature gradient (blue -> emerald) for ALL primary buttons */
  --grad: linear-gradient(135deg, #2d6cdf, #00a77f);
  --grad-hover: linear-gradient(135deg, #2961c9, #00946f);

  /* soft tints for secondary/outline buttons */
  --accent: #2d6cdf;
  --accent-deep: #1f57c4;
  --accent-soft: #e8f0fe;
  --emerald-soft: #e3f5ef;

  /* text */
  --ink: #102033;
  --ink-2: #3a4a5e;
  --heading: #0e2138;
  --muted: #677489;

  /* light-blue surface ramp */
  --bg: #f4f7fb;
  --bg-2: #eef4fb;
  --card: #ffffff;
  --line: #dce5ef;
  --line-strong: #c6d4e6;

  --warn: #ffb84d;
  --danger: #ff6b6b;

  --shadow-sm: 0 1px 2px rgba(16,32,51,0.05), 0 1px 3px rgba(16,32,51,0.07);
  --shadow-md: 0 6px 18px rgba(16,32,51,0.07), 0 2px 6px rgba(16,32,51,0.05);
  --shadow-lg: 0 16px 40px rgba(16,32,51,0.10), 0 4px 10px rgba(16,32,51,0.05);

  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
}
:root {
  --top-offset: 118px;
  --panel-min-height: calc(100vh - var(--top-offset));
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: radial-gradient(circle at top left, #e9f7ff, var(--bg) 40%, #f8fbff 100%);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}


.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
}

.sidebar {
  background: linear-gradient(180deg, var(--navy), #061121);
  color: white;
  padding: 24px 20px;
  box-shadow: 10px 0 30px rgba(6,17,33,0.18);
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
  flex: 0 0 auto;
}

.brand-logo{
  width:58px;
  height:58px;
  border-radius:50%;
  object-fit:cover;
  display:block;
  background:transparent;
  border:none;
  box-shadow:none;
  flex:0 0 auto;
}

.brand h1 {
  margin: 0;
  font-size: 22px;
}

.brand p {
  margin: 3px 0 0;
  color: #b6c6d8;
  font-size: 13px;
}

.brand-copy{
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-width:0;
}

.brand-wordmark-img{
  height:28px;
  width:auto;
  max-width:185px;
  object-fit:contain;
  display:block;
}

.brand-copy p{
  margin:4px 0 0;
  font-size:13px;
  color:rgba(220,230,245,0.72);
  line-height:1.2;
}

.student-card {
  display: flex;
  align-items: center;
  gap: 12px;

  width: calc(100% - 44px);
  margin: 18px 22px 20px 22px;
  padding: 18px 20px;

  box-sizing: border-box;
  border-radius: 18px;

  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.09);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
}

.student-status-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: #62f6a8;
  box-shadow: 0 0 14px rgba(98, 246, 168, 0.75);
  flex-shrink: 0;
}

.student-info {
  min-width: 0;
}

.student-name {
  font-size: 16px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.2;
}

.student-plan {
  margin-top: 4px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(214, 225, 245, 0.78);
  line-height: 1.25;
}

.chapter-pill {
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.07);
  border-radius: 16px;
  padding: 13px;
  line-height: 1.35;
  margin-bottom: 18px;
  color: #eaf2ff;
  flex: 0 0 auto;
}

.concept-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-btn {
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.05);
  color: #d9e7f8;
  text-align: left;
  border-radius: 14px;
  padding: 12px 12px;
  cursor: pointer;
  font-size: 14px;
  transition: 0.18s ease;
}

.nav-btn:hover { background: rgba(255,255,255,0.1); }
.nav-btn.active {
  background: rgba(162,255,134,0.14);
  border-color: rgba(162,255,134,0.65);
  color: white;
}

.voice-card {
  margin-top: 0;
  padding: 14px;
  border-radius: 16px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  flex: 0 0 auto;
}

.voice-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.voice-card p {
  margin: 0 0 12px;
  font-size: 11px;
  color: #b6c6d8;
  line-height: 1.45;
}

.switch-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.lesson {
  padding: 24px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--emerald);
  font-weight: 800;
  font-size: 12px;
}

h2 {
  margin: 5px 0 0;
  font-size: 30px;
  color: #071b33;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 10px 15px;
  font-weight: 750;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover { transform: translateY(-1px); }

.primary {
  background: linear-gradient(135deg, var(--blue), var(--emerald));
  color: white;
  box-shadow: 0 10px 24px rgba(45,108,223,0.22);
}

.ghost {
  background: white;
  color: var(--navy);
  border: 1px solid var(--line);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(720px, 1fr) 360px;
  gap: 18px;
  align-items: stretch;
  min-height: var(--panel-min-height);
  flex: 1;
}

.canvas-card, .explain-card {
  background: rgba(255,255,255,0.88);
  border: 1px solid rgba(220,229,239,0.9);
  box-shadow: 0 18px 45px rgba(18,47,77,0.08);
  border-radius: 24px;
}

.canvas-card {
  padding: 14px;
  min-height: var(--panel-min-height);
  display: flex;
  flex-direction: column;
}

#stage {
  width: 100%;
  height: clamp(480px, 58vh, 640px);
  border-radius: 20px;
  background: linear-gradient(180deg, #ffffff, #f7fbff);
  border: 1px solid #e8eef6;
  flex: 1 1 auto;
}

.explain-card {
  padding: 22px;
  min-height: var(--panel-min-height);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.section {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
  margin-bottom: 16px;
}

.section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.section h3 {
  margin: 0 0 7px;
  color: var(--navy);
  font-size: 15px;
}

.section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 14px;
}

.interaction-panel {
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 13px 4px 0;
  color: var(--muted);
}

.interaction-panel input, .interaction-panel select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  background: white;
}

.interaction-panel button {
  padding: 9px 13px;
  background: var(--navy);
  color: white;
}

.axis { stroke: #17375e; stroke-width: 3; }
.grid-line { stroke: #dce6f1; stroke-width: 1; }
.grid-major { stroke: #b8c8da; stroke-width: 1.35; }
.label { fill: #24384f; font-size: 14px; font-weight: 750; }
.small-label { fill: #53677d; font-size: 11px; font-weight: 600; }
.glow-text { fill: #071b33; font-size: 26px; font-weight: 850; }
.point { fill: var(--emerald); stroke: #063f34; stroke-width: 3; }
.point2 { fill: var(--warn); stroke: #7a4a00; stroke-width: 3; }
.point3 { fill: var(--danger); stroke: #6b1919; stroke-width: 3; }
.helper { stroke: #2d6cdf; stroke-width: 3; stroke-dasharray: 7 6; fill: none; }
.highlight { fill: rgba(162,255,134,0.26); stroke: rgba(0,167,127,0.9); stroke-width: 2; }
.room-wall { fill: #fdfefe; stroke: #102033; stroke-width: 4; }
.furniture { fill: rgba(45,108,223,0.14); stroke: #2d6cdf; stroke-width: 2; }
.door { stroke: #00a77f; stroke-width: 6; stroke-linecap: round; }
.quad { opacity: 0.28; }
.formula-box {
  fill: white;
  stroke: #dce5ef;
  stroke-width: 2;
  filter: drop-shadow(0 8px 16px rgba(0,0,0,.08));
}
.fade-in { animation: fadeIn .5s ease both; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1100px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .content-grid { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; }
}


/* Karka / Diya avatar, chat, dynamic tutor panel, and collapsible sidebar */
.brand-logo { width: 52px; height: 52px; border-radius: 16px; box-shadow: 0 0 28px rgba(162,255,134,.3); flex: 0 0 auto; }
.collapse-btn { width: 42px; height: 42px; border-radius: 14px; background: rgba(255,255,255,.08); color: white; border: 1px solid rgba(255,255,255,.14); margin-bottom: 14px; display: grid; place-items: center; font-size: 18px; }
.tutor-avatar-card { text-align: center; }
.avatar-wrap { width: 72px; height: 72px; margin: 0 auto 10px; border-radius: 50%; padding: 4px; background: linear-gradient(135deg, var(--lime), var(--emerald), var(--blue)); box-shadow: 0 0 28px rgba(162,255,134,.18); }
.avatar-wrap img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; background: white; }
.switch-row { justify-content: center; }
.tutor-response-section { background: #f7fbff; padding: 14px; border-radius: 16px; border: 1px solid #dce5ef; }
.formula-section { background: #fffdf6; padding: 14px; border-radius: 16px; border: 1px solid #f1dfaf; }
.chat-box {
  margin-top: 14px;
  border: 1px solid #dce5ef;
  border-radius: 20px;
  padding: 14px;
  background: #ffffff;
  flex: 0 0 auto;
}
.chat-title-row { display:flex; justify-content:space-between; gap:12px; align-items:flex-start; margin-bottom:10px; }
.chat-title { font-weight:850; color:#071b33; }
.chat-subtitle { color:var(--muted); font-size:12px; margin-top:3px; }
.chat-status { font-size:11px; padding:5px 9px; border-radius:999px; background:#edf5ff; color:#2d6cdf; border:1px solid #dcecff; white-space:nowrap; }
.chat-empty { color:#8a99aa; }
.chat-message { margin-bottom:9px; line-height:1.45; }
.chat-message strong { color:#071b33; }
.chat-input-row { display:flex; gap:10px; }
.chat-input-row input { flex:1; border:1px solid #dce5ef; border-radius:999px; padding:12px 14px; font-size:14px; }
.chat-input-row button { background:linear-gradient(135deg,#2d6cdf,#00a77f); color:white; min-width:86px; }
.app-shell.sidebar-collapsed { grid-template-columns: 92px 1fr; }
.app-shell.sidebar-collapsed .sidebar { padding: 20px 12px; }
.app-shell.sidebar-collapsed .brand { justify-content: center; margin-bottom: 16px; }
.app-shell.sidebar-collapsed .brand-copy,
.app-shell.sidebar-collapsed .chapter-pill,
.app-shell.sidebar-collapsed .concept-nav,
.app-shell.sidebar-collapsed .logout-btn { display: none; }
.app-shell.sidebar-collapsed .brand-logo { width: 50px; height: 50px; }


/* Learning mode toolbar: Visual, Formulas, Worked Example, Exemplar Practice, Mock Exam, Exercises */
.mode-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 2px 0 14px;
  padding: 8px;
  border-radius: 18px;
  background: #f7fbff;
  border: 1px solid #dce5ef;
}

.mode-btn {
  background: #ffffff;
  border: 1px solid #dce5ef;
  color: #31445b;
  box-shadow: 0 6px 16px rgba(7, 27, 51, 0.04);
}
.mode-btn:hover {
  border-color: #b8c9df;
  background: #f7fbff;
  transform: translateY(-1px);
}

.mode-btn.active {
  background: linear-gradient(135deg, #0b1f33, #2563eb);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.22);
}

.replay-btn { margin-left: auto; }

.hidden { display: none !important; }

.mode-content {
  min-height: 560px;
  border-radius: 20px;
  background: linear-gradient(180deg, #ffffff, #f7fbff);
  border: 1px solid #e8eef6;
  padding: 26px;
  overflow: auto;
}

.mode-card {
  background: #ffffff;
  border: 1px solid #dce5ef;
  border-radius: 18px;
  padding: 18px;
  margin-bottom: 14px;
  box-shadow: 0 10px 24px rgba(18,47,77,0.05);
}

.mode-card h3, .mode-card h4 {
  margin: 0 0 10px;
  color: #071b33;
}

.mode-card p, .mode-card li {
  color: #53677d;
  line-height: 1.55;
}

.formula-grid, .exam-choice-grid, .chapter-check-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

.formula-item, .exam-choice, .chapter-check {
  border: 1px solid #dce5ef;
  background: #f7fbff;
  border-radius: 16px;
  padding: 14px;
}

.formula-symbol {
  display: block;
  font-size: 18px;
  font-weight: 850;
  color: #071b33;
  margin-bottom: 6px;
}

.exam-choice {
  cursor: pointer;
  text-align: left;
}

.exam-choice.active {
  border-color: #00a77f;
  background: #eefcf7;
  color: #071b33;
}

.chapter-check {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #071b33;
  font-weight: 700;
}

.exam-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 16px 0;
  padding: 14px;
  background: #fffdf6;
  border: 1px solid #f1dfaf;
  border-radius: 16px;
  color: #071b33;
  font-weight: 750;
}

.start-exam-btn, .practice-btn {
  background: linear-gradient(135deg, #2d6cdf, #00a77f);
  color: white;
  padding: 12px 18px;
}

.warning-text { color: #b45309; font-weight: 750; }

/* Full right-panel chat response mode */
.chat-response-mode { height: 100%; }

.chat-response-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid #dce5ef;
}

.chat-response-header h3 {
  margin: 0;
  color: #071b33;
  font-size: 18px;
}

.chat-response-header p {
  margin: 4px 0 0;
  color: #677489;
  font-size: 13px;
}

.small-ghost {
  background: white;
  border: 1px solid #dce5ef;
  color: #071b33;
  padding: 8px 12px;
  font-size: 12px;
  white-space: nowrap;
}

.big-response-box {
  background: #f7fbff;
  border: 1px solid #dce5ef;
  border-radius: 18px;
  padding: 16px;
  margin-bottom: 14px;
}

.big-response-box h4 {
  margin: 0 0 8px;
  color: #071b33;
  font-size: 14px;
}

.big-response-box p {
  margin: 0;
  color: #53677d;
  line-height: 1.6;
  font-size: 15px;
  white-space: pre-line;
}

.formula-box-ui {
  background: #fffdf6;
  border-color: #f1dfaf;
}
.attach-btn {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: #f7fbff;
  border: 1px solid #dce5ef;
  cursor: pointer;
  font-size: 18px;
  color: #071b33;
  flex: 0 0 auto;
}

.attach-btn,
.premium-attach-btn {
  width: 46px;
  height: 46px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex: 0 0 auto;
  color: #071b33;
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    linear-gradient(135deg, rgba(162,255,134,0.95), rgba(0,167,127,0.85), rgba(45,108,223,0.85)) border-box;
  border: 1.5px solid transparent;
  box-shadow:
    0 10px 22px rgba(7, 27, 51, 0.08),
    inset 0 0 0 1px rgba(255,255,255,0.75);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    color 0.18s ease,
    background 0.18s ease;
}

.attach-btn:hover,
.premium-attach-btn:hover {
  transform: translateY(-1px);
  color: #00a77f;
  box-shadow:
    0 14px 28px rgba(7, 27, 51, 0.12),
    0 0 0 4px rgba(162,255,134,0.18),
    inset 0 0 0 1px rgba(255,255,255,0.9);
}

.attach-btn:active,
.premium-attach-btn:active {
  transform: translateY(0) scale(0.98);
}

.attach-icon {
  width: 22px;
  height: 22px;
  display: block;
}
.premium-attach-btn.has-file {
  color: #ffffff;
  background:
    linear-gradient(135deg, #00a77f, #2d6cdf) padding-box,
    linear-gradient(135deg, #a2ff86, #00a77f, #2d6cdf) border-box;
}
.attachment-preview {
  margin-top: 10px;
  padding: 9px 12px;
  border-radius: 14px;
  background: #f7fbff;
  border: 1px solid #dce5ef;
  color: #53677d;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.attachment-preview.hidden {
  display: none;
}

.attachment-file-name {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.attachment-file-name span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.remove-attachment-btn {
  border: 1px solid #dce5ef;
  background: white;
  color: #071b33;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  flex: 0 0 auto;
}

/* ---- Diya mic button (v2 voice) ---- */
.mic-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 10px 16px;
  border: none;
  border-radius: 999px;
  background: #00a77f;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform .12s ease, background .2s ease;
}
.mic-btn:hover { background: #00936f; transform: translateY(-1px); }
.mic-btn:active { transform: translateY(0); }
.mic-btn svg { display: block; }

/* ---- v2 richer-animation classes ---- */
.dir-arrow { stroke-width: 4; fill: none; stroke-linecap: round; }
.dir-arrow.pos { stroke: #00a77f; }
.dir-arrow.neg { stroke: #ff6b6b; }
text { transition: opacity .2s ease; }

/* ---- v2 chapter accordion (left panel) ---- */
.concept-nav { display: flex; flex-direction: column; gap: 6px; overflow-y: auto; flex: 1 1 auto; min-height: 0; padding-right: 4px; margin-bottom: 14px; }
.chapter-block { display: flex; flex-direction: column; }
.chapter-header {
  display: flex; align-items: center; gap: 10px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.05);
  color: #d9e7f8; text-align: left; width: 100%;
  border-radius: 12px; padding: 11px 12px; cursor: pointer;
  font-size: 13.5px; transition: 0.16s ease;
}
.chapter-header:hover { background: rgba(255,255,255,0.1); }
.chapter-header.current { border-color: rgba(162,255,134,0.5); }
.chapter-header.is-locked { opacity: 0.55; }
.chapter-header .ch-num {
  flex: 0 0 22px; height: 22px; border-radius: 7px;
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
  background: rgba(162,255,134,0.16); color: #cfeecf;
}
.chapter-header.is-locked .ch-num { background: rgba(255,255,255,0.08); color: #9fb1c6; }
.chapter-header .ch-title { flex: 1 1 auto; line-height: 1.25; }
.chapter-header .ch-caret { flex: 0 0 auto; font-size: 16px; color: #9fb1c6; }
.subtopic-list { display: flex; flex-direction: column; gap: 4px; margin: 4px 0 6px 14px; padding-left: 8px; border-left: 1px solid rgba(255,255,255,0.1); }
.subtopic-btn {
  border: none; background: transparent; color: #c2d4e8;
  text-align: left; border-radius: 9px; padding: 8px 10px;
  cursor: pointer; font-size: 12.7px; transition: 0.14s ease;
}
.subtopic-btn:hover { background: rgba(255,255,255,0.08); color: #fff; }
.subtopic-btn.active { background: rgba(162,255,134,0.14); color: #fff; font-weight: 600; }
.subtopic-empty { color: #8aa0b8; font-size: 12px; font-style: italic; padding: 8px 10px; }

/* ---- v2.1 layout: Logout bottom-left, Diya dock bottom-right ---- */

/* Logout pinned at the bottom of the left sidebar */
.logout-btn {
  flex: 0 0 auto;
  margin-top: 4px;
  width: 100%;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.06);
  color: #d9e7f8;
  font-size: 14px;
  cursor: pointer;
  transition: 0.16s ease;
}
.logout-btn:hover { background: rgba(255,255,255,0.12); }

/* Right panel becomes a flex column: explanation scrolls, Diya dock pinned */
.explain-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  padding: 0;            /* inner regions handle their own padding */
  overflow: hidden;
}
.right-scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 22px 22px 14px;
}

/* Diya dock at the bottom-right */
.diya-dock {
  flex: 0 0 auto;
  border-top: 1px solid #e3ebf5;
  background: linear-gradient(180deg, #f7fbff, #eef5ff);
  padding: 14px 16px 16px;
  border-radius: 0 0 24px 24px;
}
.diya-dock-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.diya-dock-avatar {
  width: 52px; height: 52px; flex: 0 0 auto; border-radius: 50%;
  padding: 3px; background: linear-gradient(135deg, var(--lime), var(--emerald), var(--blue));
}
.diya-dock-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; background: #fff; }
.diya-dock-meta { line-height: 1.3; }
.diya-dock-name { font-weight: 800; color: #071b33; font-size: 16px; }
.diya-dock-tag { color: var(--muted); font-size: 11.5px; }
.diya-dock-status { display: flex; align-items: center; gap: 6px; font-size: 11.5px; color: #2f8f6f; margin-top: 2px; }
.diya-dock-status .dot { width: 7px; height: 7px; border-radius: 50%; background: #2fbf85; box-shadow: 0 0 0 3px rgba(47,191,133,.18); }

.dock-mic { width: 100%; justify-content: center; margin: 0 0 12px; }

/* Session placeholder cards (2-col grid) */
.session-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.session-card {
  background: #fff; border: 1px solid #e3ebf5; border-radius: 12px; padding: 9px 11px;
}
.session-card-label { font-size: 10px; letter-spacing: .04em; text-transform: uppercase; color: #8aa0b8; margin-bottom: 3px; }
.session-card-value { font-size: 12.5px; font-weight: 700; color: #18324c; line-height: 1.25; }
.quota-bar { margin-top: 6px; height: 5px; border-radius: 999px; background: #e3ebf5; overflow: hidden; }
.quota-bar span { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--emerald), var(--blue)); }
.exercise-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px 4px 4px;
}

.exercise-card {
  padding: 18px 20px;
  border-radius: 18px;
}

.exercise-meta {
  font-size: 11px;
  color: #6b7f95;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.exercise-question {
  line-height: 1.65;
  font-size: 15px;
  margin-bottom: 14px;
}

.exercise-actions {
  gap: 12px;
  margin-top: 10px;
}

.exercise-actions button {
  border: 0;
  border-radius: 999px;
  padding: 9px 16px;
  font-weight: 850;
  letter-spacing: 0.01em;
  box-shadow: 0 8px 18px rgba(7, 27, 51, 0.08);
}
.exercise-actions .view-figure-btn {
  background: #eaf1ff;
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
}

.exercise-actions .show-answer-btn {
  background: #e8fbf5;
  color: #007c5b;
  border: 1px solid #b7f0df;
}

.exercise-answer {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  background: #f7fbff;
  border: 1px solid #dce5ef;
  color: #53677d;
  font-size: 14px;
  line-height: 1.55;
}

.hidden {
  display: none;
}
/* When a full-width learning mode is active */
.content-grid.focus-mode {
  grid-template-columns: 1fr;
}

.content-grid.focus-mode .explain-card {
  display: none;
}

/* Hide the large SVG space for exercise/practice style modes */
.canvas-card.no-visual #stage {
  display: none;
}

.canvas-card.no-visual .interaction-panel {
  padding-top: 0;
}

/* Make exercise/practice cards use full width neatly */
.canvas-card.no-visual .exercise-list {
  margin-top: 18px;
}
.exercise-header {
  padding: 4px 2px 10px;
}

.exercise-header h2 {
  margin: 0 0 6px;
  font-size: 24px;
  color: #071b33;
}

.exercise-header p {
  margin: 0;
  color: #677489;
  font-size: 14px;
}
/* ---- Question rendering, Send to Diya, and Mock Exam additions ---- */
.exercise-actions .send-to-diya-btn,
.exercise-actions .send-to-diya-btn {
  background: linear-gradient(135deg, #2563eb, #00a77f);
  color: #ffffff;
}

.mcq-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.mcq-option-btn {
  text-align: left;
  padding: 12px 14px;
  border-radius: 14px;
  background: #f7fbff;
  border: 1px solid #dce5ef;
  color: #071b33;
  font-weight: 800;
}

.mcq-option-btn.correct {
  background: rgba(0, 167, 127, 0.12);
  border-color: #00a77f;
  color: #007c5b;
}

.mcq-option-btn.wrong {
  background: rgba(255, 107, 107, 0.12);
  border-color: #ff6b6b;
  color: #8a1f1f;
}

.mock-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.mock-preset-btn,
.start-mock-btn {
  border-radius: 14px;
  padding: 12px 14px;
  background: #071b33;
  color: white;
  border: 0;
  font-weight: 850;
}

.chapter-check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(240px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.chapter-check {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid #dce5ef;
  border-radius: 14px;
  background: #f7fbff;
  font-weight: 750;
}

.mock-summary {
  margin: 14px 0;
  color: #53677d;
  font-weight: 750;
}

@media (max-width: 900px) {
  .mcq-options,
  .mock-grid,
  .chapter-check-grid {
    grid-template-columns: 1fr;
  }
}
.exercise-actions .view-figure-btn {
  background: #2d6cdf;
}
.exercise-actions .view-figure-btn {
  background: #2d6cdf;
  color: #ffffff;
}
/* (toggle styles consolidated in the v2.6 block near end of file) */
.explain-card {
  position: relative;
}

.content-grid.right-collapsed {
  grid-template-columns: minmax(0, 1fr) 48px;
}

.content-grid.right-collapsed .explain-card {
  width: 48px;
  min-width: 48px;
  padding: 0;
  border-color: transparent;
  background: transparent;
  box-shadow: none;
  overflow: visible;
}
/* hide all right panel content except toggle */
.content-grid.right-collapsed .explain-card > *:not(.right-panel-toggle) {
  display: none !important;
}


/* ============================================================
   WORLD-CLASS REFINEMENT LAYER (v2.4)
   Goals from feedback:
   - softer heading ink (no harsh black)
   - proper BUTTON HIERARCHY (one primary, quiet secondaries)
   - WHITE stage for clean animation contrast
   - fixed, elegant right-panel toggle
   - editorial spacing rhythm + considered detail
   ============================================================ */

/* ---- Display typography: Fraunces, softened weight + colour ---- */
h1, h2, .brand h1, #chapterTitle, .glow-text,
.exercise-header h2, .chat-response-header h3 {
  font-family: var(--font-display);
  color: var(--heading);
  font-weight: 560;
  letter-spacing: -0.015em;
}
h2, #chapterTitle { font-size: 29px; line-height: 1.15; }
.brand h1 { font-size: 21px; font-weight: 600; color: #fff; }
.section h3 { font-family: var(--font-display); font-weight: 560; color: var(--heading); font-size: 16px; letter-spacing: -0.01em; }

.eyebrow {
  color: var(--emerald);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 700;
  font-size: 10.5px;
}

/* body copy a touch warmer/softer than pure ink */
.section p, .big-response-box p, #chapterIntro { color: var(--ink-2); }

/* ---- Sidebar: deep slate, hairline edge, calm ---- */
.sidebar {
  background: linear-gradient(180deg, #20293c, #161d2b);
  box-shadow: inset -1px 0 0 rgba(255,255,255,0.05);
}
.brand p { color: #97a1b6; font-size: 12px; }
.chapter-pill { background: rgba(255,255,255,0.045); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--r-md); color: #dfe5f0; }
.chapter-header { border-radius: var(--r-md); font-weight: 550; }
.chapter-header.current { background: rgba(122,148,245,0.13); border-color: rgba(122,148,245,0.45); }
.chapter-header .ch-num { background: rgba(122,148,245,0.2); color: #cdd8fb; border-radius: 7px; font-weight: 700; }
.subtopic-btn.active { background: rgba(122,148,245,0.15); color: #fff; font-weight: 550; }
.nav-btn.active { background: rgba(122,148,245,0.15); border-color: rgba(122,148,245,0.4); }
.logout-btn { border-radius: var(--r-md); }

/* ---- Lesson canvas: generous rhythm ---- */
.lesson { padding: 32px 36px; }
.content-grid { gap: 24px; }

/* ---- Cards: hairline, soft shadow, unified radius ---- */
.canvas-card, .explain-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-md);
}

/* ---- WHITE STAGE for clean animation contrast (key fix) ---- */
#stage {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

/* ---- Mode toolbar: quiet rail, single ink-filled active ---- */
.mode-toolbar { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r-md); gap: 4px; padding: 5px; }
.mode-btn {
  background: transparent; border: 1px solid transparent; color: var(--muted);
  font-weight: 550; border-radius: var(--r-sm); font-size: 13.5px; transition: 0.15s ease;
}
.mode-btn:hover { background: #fff; color: var(--heading); box-shadow: var(--shadow-sm); }
.mode-btn.active { background: var(--navy); color: #fff; border-color: var(--navy); box-shadow: var(--shadow-sm); }
.replay-btn { color: var(--muted); }

/* ============================================================
   BUTTON HIERARCHY (the core fix for "three jarring colours")
   One PRIMARY (filled accent). SECONDARY (quiet outline).
   TERTIARY (ghost/text). Colour signals importance, not variety.
   ============================================================ */

/* global pill buttons calmer */
button { transition: transform .14s ease, box-shadow .14s ease, background .18s ease, border-color .18s ease; font-weight: 600; }
button:hover { transform: translateY(-1px); }

/* top stage controls (Play primary, rest ghost) */
.primary, #topPlayBtn, .primary-btn {
  background: var(--grad); color: #fff; border: none;
  box-shadow: var(--shadow-sm);
}
.primary:hover, #topPlayBtn:hover { background: var(--grad-hover); }
.ghost, .ghost-btn {
  background: #fff; color: var(--ink-2); border: 1px solid var(--line-strong);
}
.ghost:hover, .ghost-btn:hover { background: var(--bg-2); color: var(--heading); }

/* EXERCISE CARD actions — the trio that clashed.
   Primary = Send to Diya (accent, the main action).
   Secondary = Show Answer (quiet outline).
   Tertiary = View Figure (ghost text-button). */
.exercise-actions { gap: 8px; align-items: center; }
.exercise-actions button { border-radius: 999px; padding: 9px 16px; font-size: 13px; }

.exercise-actions .send-to-diya-btn,
.exercise-actions .send-to-diya-rendered-btn {
  background: var(--grad); color: #fff; border: none;
  box-shadow: var(--shadow-sm); order: 1;
}
.exercise-actions .send-to-diya-btn:hover { background: var(--grad-hover); }

.exercise-actions .show-answer-btn {
  background: #fff; color: var(--accent-deep);
  border: 1px solid #d4dbf3; order: 2;
}
.exercise-actions .show-answer-btn:hover { background: var(--accent-soft); }

.exercise-actions .view-figure-btn {
  background: transparent; color: var(--muted);
  border: 1px solid transparent; padding-left: 10px; padding-right: 10px; order: 3;
}
.exercise-actions .view-figure-btn:hover { background: var(--bg-2); color: var(--heading); }

/* exercise cards themselves */
.exercise-card { border: 1px solid var(--line); border-radius: var(--r-md); box-shadow: var(--shadow-sm); padding: 18px 20px; }
.exercise-card:hover { box-shadow: var(--shadow-md); }
.exercise-meta { color: var(--muted); letter-spacing: 0.07em; font-size: 11px; text-transform: uppercase; }
.exercise-question { color: var(--ink); font-weight: 500; line-height: 1.6; }
.exercise-header p { color: var(--muted); }

/* ---- Right-panel response boxes: calm, editorial ---- */
.big-response-box { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r-md); }
.big-response-box h4 { color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; font-size: 11px; font-weight: 700; }
.formula-box-ui { background: #fbf8f0; border-color: #ecdfc6; }
.chat-response-header h3 { font-size: 19px; }
.chat-response-header p { color: var(--muted); }
.small-ghost { background: #fff; border: 1px solid var(--line-strong); color: var(--ink-2); border-radius: 999px; }
.small-ghost:hover { background: var(--bg-2); }

/* ---- Chat input row: primary send ---- */
.chat-box { border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-sm); }
.chat-input-row input { border: 1px solid var(--line-strong); border-radius: 999px; }
.chat-input-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.chat-input-row button { background: var(--grad); border: none; }
.chat-input-row button:hover { background: var(--grad-hover); }
.chat-status { background: var(--accent-soft); color: var(--accent-deep); border: 1px solid #dde3f7; }

/* ---- Diya dock: warm, refined ---- */
.diya-dock { background: linear-gradient(180deg, #faf9f5, #f1f0ea); border-top: 1px solid var(--line); }
.diya-dock-name { font-family: var(--font-display); font-weight: 600; color: var(--heading); }
.dock-mic { background: var(--grad); border: none; }
.dock-mic:hover { background: var(--grad-hover); }
.session-card { border-radius: var(--r-sm); border: 1px solid var(--line); box-shadow: var(--shadow-sm); background: #fff; }
.session-card-value { color: var(--heading); }
.quota-bar span { background: linear-gradient(90deg, var(--accent), var(--emerald)); }

/* ---- MCQ options ---- */
.mcq-option-btn { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r-sm); color: var(--ink); font-weight: 550; }
.mcq-option-btn:hover { background: #fff; box-shadow: var(--shadow-sm); }
.mcq-option-btn.correct { background: var(--emerald-soft); border-color: var(--emerald); color: #1f6b50; }
.mcq-option-btn.wrong { background: #fbeceb; border-color: var(--danger); color: #9a322f; }

/* ============================================================
   RIGHT-PANEL TOGGLE — superseded by the floating-seam version
   at the end of this file. This block intentionally left minimal.
   ============================================================ */
.explain-card { position: relative; }

/* collapsed grid width (toggle position handled in the final block) */
.content-grid.right-collapsed { grid-template-columns: minmax(0,1fr) 48px; }
.content-grid.right-collapsed .explain-card {
  width: 48px; min-width: 48px; padding: 0;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  overflow: visible;
}
.content-grid.right-collapsed .explain-card > *:not(.right-panel-toggle) { display: none !important; }

/* ---- Refined scrollbars ---- */
.concept-nav::-webkit-scrollbar, .right-scroll::-webkit-scrollbar { width: 7px; }
.right-scroll::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 99px; }
.concept-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.16); border-radius: 99px; }
.right-scroll::-webkit-scrollbar-track, .concept-nav::-webkit-scrollbar-track { background: transparent; }

/* ============================================================
   v2.5 CORRECTIONS — gradient button system across ALL tabs,
   fix Mock Exam black buttons, refine toggle + active pill.
   ============================================================ */

/* Active mode pill: gradient instead of flat black */
.mode-btn.active {
  background: var(--grad);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

/* MOCK EXAM — was a wall of black buttons. Now: presets = quiet
   outline, "Generate Paper" = the one primary gradient. */
.mock-preset-btn {
  background: #fff;
  color: var(--accent-deep);
  border: 1px solid #cfdcf3;
  border-radius: var(--r-sm);
  font-weight: 600;
}
.mock-preset-btn:hover { background: var(--accent-soft); }
.mock-preset-btn.active,
.mock-preset-btn:focus-visible {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-deep);
}
.start-mock-btn {
  background: var(--grad);
  color: #fff;
  border: none;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-sm);
}
.start-mock-btn:hover { background: var(--grad-hover); }

/* chapter checkboxes in the mock grid: clean, light */
.chapter-check { background: #fff; border: 1px solid var(--line); border-radius: var(--r-sm); color: var(--ink); font-weight: 500; }
.chapter-check:hover { border-color: var(--accent); }
.mock-summary { color: var(--muted); }

/* any other stray dark utility buttons -> gradient primary,
   so nothing renders as flat black anywhere */
.interaction-panel button {
  background: var(--grad);
  color: #fff;
  border: none;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}
.interaction-panel button:hover { background: var(--grad-hover); }

/* stage stays clean white; surrounding panel tint light-blue */
#stage { background: #ffffff; border: 1px solid var(--line); }
.canvas-card, .explain-card { background: var(--card); }

/* ---- TOGGLE: a clean pill floating ON the seam between panels.
   Anchored to the grid (not the card, which has overflow:hidden and
   would clip it). Sits clear of the panel edge with a soft shadow. ---- */
.content-grid { position: relative; }
.explain-card { position: static; }
.right-panel-toggle {
  position: absolute;
  top: 50%;
  /* centre the pill on the seam: panel 360px + 24px gap from the right
     edge; offset back by half the pill width (14px) to straddle it. */
  right: calc(360px + 24px - 14px);
  transform: translateY(-50%);
  width: 28px; height: 56px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--accent-deep);
  display: grid; place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  z-index: 40;
  padding: 0;
  transition: background .15s ease, color .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.right-panel-toggle:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
}
.right-panel-toggle .rpt-chevron {
  font-size: 17px; font-weight: 700; line-height: 1;
  transition: transform .2s ease;
}
.right-panel-toggle:hover .rpt-chevron { transform: translateX(-1px); }

/* collapsed: rail is 48px; centre pill on that rail's left seam (48 + 24 gap - 14) */
.content-grid.right-collapsed .right-panel-toggle { right: calc(48px + 24px - 14px); }
.content-grid.right-collapsed .right-panel-toggle .rpt-chevron { transform: rotate(180deg); }

/* ---- Figure renderer text styles ---- */
.fig-label { fill: #1f3a52; font-size: 12px; font-weight: 700; font-family: var(--font-body); }
.fig-small { fill: #53677d; font-size: 12px; font-weight: 600; font-family: var(--font-body); text-anchor: middle; }
.fig-quad  { fill: #8aa0b8; font-size: 13px; font-weight: 700; font-family: var(--font-body); text-anchor: middle; letter-spacing: 0.04em; }
.fig-eq    { fill: #2d6cdf; font-size: 13px; font-weight: 800; font-family: var(--font-body); }

/* ============================================================
   KARKA FINAL UI OVERRIDES
   Premium light theme, cleaner spacing, better toggle behavior
   ============================================================ */

:root {
  --karka-bg: #f5f8fc;
  --karka-card: #ffffff;
  --karka-line: #dbe5f1;
  --karka-line-strong: #c8d5e6;

  --karka-text: #24364a;
  --karka-text-soft: #5f748b;
  --karka-heading: #12263a;

  --karka-blue: #2d6cdf;
  --karka-blue-deep: #1f57bc;
  --karka-blue-soft: #eaf2ff;

  --karka-teal: #12b3a6;
  --karka-teal-deep: #0d9488;
  --karka-teal-soft: #e8fbf8;

  --karka-gold-soft: #fbf7ef;
  --karka-gold-line: #eadfca;

  --karka-grad: linear-gradient(90deg, #2d6cdf 0%, #12b3a6 100%);
  --karka-grad-hover: linear-gradient(90deg, #245dc3 0%, #109c92 100%);

  --karka-shadow-sm: 0 6px 18px rgba(23, 44, 77, 0.06);
  --karka-shadow-md: 0 10px 28px rgba(23, 44, 77, 0.10);

  --karka-radius-sm: 12px;
  --karka-radius-md: 18px;
  --karka-radius-lg: 22px;
}

/* overall surfaces */
body {
  background: var(--karka-bg);
  color: var(--karka-text);
}

.canvas-card,
.explain-card,
.exercise-card,
.chat-box,
.session-card {
  background: var(--karka-card);
  border: 1px solid var(--karka-line);
  box-shadow: var(--karka-shadow-sm);
}

/* keep stage clean */
#stage {
  background: #fff;
  border: 1px solid var(--karka-line);
  border-radius: 16px;
}

/* ------------------------------------------------------------
   TOP MODE BUTTONS / TAB BUTTONS
   ------------------------------------------------------------ */
.mode-btn,
.tab-btn,
button.mode-btn {
  background: #fff;
  color: var(--karka-text);
  border: 1px solid var(--karka-line-strong);
  border-radius: 999px;
  font-weight: 600;
  box-shadow: none;
  transition: all 0.18s ease;
}

.mode-btn:hover,
.tab-btn:hover,
button.mode-btn:hover {
  background: var(--karka-blue-soft);
  color: var(--karka-blue-deep);
  border-color: #c9daf8;
}

.mode-btn.active,
.tab-btn.active,
button.mode-btn.active {
  background: var(--karka-grad);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--karka-shadow-sm);
}

/* replay / ghost-style controls */
.ghost,
.ghost-btn,
.small-ghost {
  background: #fff;
  color: var(--karka-text);
  border: 1px solid var(--karka-line-strong);
}

.ghost:hover,
.ghost-btn:hover,
.small-ghost:hover {
  background: #f6f9fd;
  color: var(--karka-heading);
}

/* play / primary buttons */
.primary,
.primary-btn,
#topPlayBtn {
  background: var(--karka-grad);
  color: #fff;
  border: none;
  box-shadow: var(--karka-shadow-sm);
}

.primary:hover,
.primary-btn:hover,
#topPlayBtn:hover {
  background: var(--karka-grad-hover);
}

/* ------------------------------------------------------------
   EXERCISE LAYOUT IMPROVEMENTS
   ------------------------------------------------------------ */
.exercise-card {
  padding: 20px 22px;
  border-radius: var(--karka-radius-md);
}

.exercise-meta {
  color: var(--karka-text-soft);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.exercise-question {
  color: var(--karka-heading);
  font-weight: 500;
  line-height: 1.62;
  margin-top: 8px;
}

.exercise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
  align-items: center;
}

.exercise-actions button {
  min-height: 40px;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.18s ease;
}

/* View Figure */
.exercise-actions .view-figure-btn {
  background: #fff;
  color: var(--karka-blue-deep);
  border: 1px solid #cddcf5;
}

.exercise-actions .view-figure-btn:hover {
  background: var(--karka-blue-soft);
  border-color: #b8cef4;
}

/* Show Answer */
.exercise-actions .show-answer-btn {
  background: #fff;
  color: #1b8f83;
  border: 1px solid #c8ece8;
}

.exercise-actions .show-answer-btn:hover {
  background: var(--karka-teal-soft);
  border-color: #a8ded7;
}

/* Send to Diya */
.exercise-actions .send-to-diya-btn,
.exercise-actions .send-to-diya-rendered-btn {
  background: var(--karka-grad);
  color: #fff;
  border: none;
  box-shadow: var(--karka-shadow-sm);
}

.exercise-actions .send-to-diya-btn:hover,
.exercise-actions .send-to-diya-rendered-btn:hover {
  background: var(--karka-grad-hover);
}

/* ------------------------------------------------------------
   CHAT / DIYA PANELS
   ------------------------------------------------------------ */
.chat-response-header h3 {
  color: var(--karka-heading);
  font-size: 19px;
}

.chat-response-header p,
.exercise-header p,
.mock-summary,
.chat-status {
  color: var(--karka-text-soft);
}

.big-response-box {
  background: #f8fbff;
  border: 1px solid var(--karka-line);
  border-radius: 18px;
}

.big-response-box h4 {
  color: var(--karka-text-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 700;
}

.formula-box-ui {
  background: var(--karka-gold-soft);
  border-color: var(--karka-gold-line);
}

.chat-box {
  border-radius: var(--karka-radius-lg);
  overflow: hidden;
}

.chat-input-row input {
  border: 1px solid var(--karka-line-strong);
  border-radius: 999px;
  background: #fff;
}

.chat-input-row input:focus {
  outline: none;
  border-color: var(--karka-blue);
  box-shadow: 0 0 0 3px rgba(45, 108, 223, 0.12);
}

.chat-input-row button,
#sendQuestionBtn {
  background: var(--karka-grad);
  color: #fff;
  border: none;
  box-shadow: var(--karka-shadow-sm);
}

.chat-input-row button:hover,
#sendQuestionBtn:hover {
  background: var(--karka-grad-hover);
}

.chat-status {
  background: #eef5ff;
  border: 1px solid #d5e3f8;
  color: var(--karka-blue-deep);
}

/* dock */
.diya-dock {
  background: linear-gradient(180deg, #fafbfc 0%, #f2f6fb 100%);
  border-top: 1px solid var(--karka-line);
}

.diya-dock-name {
  color: var(--karka-heading);
  font-weight: 700;
}

.dock-mic {
  background: var(--karka-grad);
  border: none;
}

.dock-mic:hover {
  background: var(--karka-grad-hover);
}

/* ------------------------------------------------------------
   MOCK EXAM BUTTONS
   ------------------------------------------------------------ */
.mock-preset-btn {
  background: #fff;
  color: var(--karka-blue-deep);
  border: 1px solid #cfdbf1;
  border-radius: 14px;
  font-weight: 600;
}

.mock-preset-btn:hover {
  background: var(--karka-blue-soft);
}

.mock-preset-btn.active,
.mock-preset-btn:focus-visible {
  background: var(--karka-blue-soft);
  border-color: var(--karka-blue);
  color: var(--karka-blue-deep);
}

.start-mock-btn {
  background: var(--karka-grad);
  color: #fff;
  border: none;
  border-radius: 16px;
  box-shadow: var(--karka-shadow-sm);
}

.start-mock-btn:hover {
  background: var(--karka-grad-hover);
}

.chapter-check {
  background: #fff;
  border: 1px solid var(--karka-line);
  border-radius: 14px;
  color: var(--karka-text);
}

.chapter-check:hover {
  border-color: var(--karka-blue);
}

/* ------------------------------------------------------------
   RIGHT PANEL TOGGLE — clean seam placement
   ------------------------------------------------------------ */
.content-grid {
  position: relative;
}

/* expanded state */
.right-panel-toggle {
  position: absolute;
  top: 50%;
  right: calc(360px + 24px - 14px);
  transform: translateY(-50%);
  width: 28px;
  height: 56px;
  border-radius: 999px;
  border: 1px solid var(--karka-line);
  background: #fff;
  color: var(--karka-blue-deep);
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--karka-shadow-md);
  z-index: 50;
  padding: 0;
  transition: all 0.18s ease;
}

.right-panel-toggle:hover {
  background: var(--karka-blue-soft);
  border-color: var(--karka-blue);
}

.right-panel-toggle .rpt-chevron {
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
  transition: transform 0.18s ease;
}

/* collapsed state */
.content-grid.right-collapsed {
  grid-template-columns: minmax(0, 1fr) 48px !important;
}

.content-grid.right-collapsed .explain-card {
  width: 48px;
  min-width: 48px;
  padding: 0;
  overflow: visible;
}

.content-grid.right-collapsed .explain-card > *:not(.right-panel-toggle) {
  display: none !important;
}

.content-grid.right-collapsed .right-panel-toggle {
  right: calc(48px + 24px - 14px);
}

.content-grid.right-collapsed .right-panel-toggle .rpt-chevron {
  transform: rotate(180deg);
}

/* ------------------------------------------------------------
   FIGURE TEXT / SVG LABEL CLEANUP
   ------------------------------------------------------------ */
.fig-label {
  fill: #1f3a52;
  font-size: 12px;
  font-weight: 700;
}

.fig-small {
  fill: #58718b;
  font-size: 12px;
  font-weight: 600;
  text-anchor: middle;
}

.fig-quad {
  fill: #8aa0b8;
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
  letter-spacing: 0.04em;
}

.fig-eq {
  fill: #2d6cdf;
  font-size: 13px;
  font-weight: 800;
}

/* ------------------------------------------------------------
   MOBILE / SMALL WIDTH SAFETY
   ------------------------------------------------------------ */
@media (max-width: 1200px) {
  .exercise-actions {
    gap: 8px;
  }

  .exercise-actions button {
    font-size: 13px;
    padding: 8px 14px;
  }

  .right-panel-toggle {
    width: 26px;
    height: 52px;
  }
}

/* ============================================================
   REAL WORLD TAB
   ============================================================ */

.realworld-panel {
  width: 100%;
  padding: 14px 4px 4px;
}

.realworld-header h2 {
  margin: 0 0 6px;
  color: var(--karka-heading, #12263a);
  font-size: 22px;
}

.realworld-header p {
  margin: 0 0 14px;
  color: var(--karka-text-soft, #5f748b);
  font-size: 14px;
}

.realworld-feature-card {
  padding: 18px 20px;
  border-radius: 20px;
  border: 1px solid var(--karka-line, #dbe5f1);
  background:
    radial-gradient(circle at top right, rgba(45,108,223,0.12), transparent 35%),
    linear-gradient(180deg, #ffffff, #f8fbff);
  box-shadow: var(--karka-shadow-sm, 0 6px 18px rgba(23,44,77,0.06));
  margin-bottom: 14px;
}

.realworld-kicker {
  color: var(--karka-blue-deep, #1f57bc);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.realworld-feature-card h3 {
  margin: 0 0 8px;
  color: var(--karka-heading, #12263a);
  font-size: 20px;
}

.realworld-feature-card p {
  margin: 0 0 14px;
  color: var(--karka-text, #24364a);
  line-height: 1.55;
}

.realworld-play-btn {
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  background: var(--karka-grad, linear-gradient(90deg, #2d6cdf 0%, #12b3a6 100%));
  color: #ffffff;
  font-weight: 800;
  box-shadow: var(--karka-shadow-sm, 0 6px 18px rgba(23,44,77,0.06));
}

.realworld-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 12px;
}

.realworld-card {
  text-align: left;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--karka-line, #dbe5f1);
  background: #ffffff;
  color: var(--karka-text, #24364a);
  box-shadow: var(--karka-shadow-sm, 0 6px 18px rgba(23,44,77,0.06));
}

.realworld-card span {
  display: block;
  font-weight: 850;
  color: var(--karka-heading, #12263a);
  margin-bottom: 5px;
}

.realworld-card small {
  display: block;
  color: var(--karka-text-soft, #5f748b);
  line-height: 1.45;
}

.realworld-card.active {
  border-color: var(--karka-blue, #2d6cdf);
  background: var(--karka-blue-soft, #eaf2ff);
}
/* ============================================================
   PRACTICE CENTRE + PREMIUM REAL WORLD
   ============================================================ */

.mode-tabs {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.mode-tabs .replay-mode-btn {
  margin-left: auto;
}

.practice-shell {
  padding: 18px;
  width: 100%;
}

.practice-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.practice-kicker {
  font-size: 11px;
  letter-spacing: 0.12em;
  font-weight: 850;
  color: #2d6cdf;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.practice-header h2 {
  margin: 0 0 6px;
  color: #12263a;
  font-size: 24px;
}

.practice-header p {
  margin: 0;
  color: #5f748b;
  font-size: 14px;
}

.practice-mode-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.practice-mode-btn {
  border: 1px solid #dbe5f1;
  background: #ffffff;
  color: #24364a;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 750;
  cursor: pointer;
  transition: all 0.18s ease;
}

.practice-mode-btn:hover {
  background: #eaf2ff;
  color: #1f57bc;
}

.practice-mode-btn.active {
  color: #ffffff;
  border-color: transparent;
  background: linear-gradient(90deg, #2d6cdf 0%, #12b3a6 100%);
  box-shadow: 0 8px 20px rgba(45, 108, 223, 0.16);
}

.practice-content {
  width: 100%;
}

.practice-empty {
  border: 1px solid #dbe5f1;
  background: #ffffff;
  border-radius: 18px;
  padding: 22px;
  color: #24364a;
}

.practice-empty h3 {
  margin: 0 0 8px;
  color: #12263a;
}

.realworld-shell {
  padding-top: 8px;
}

.realworld-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 12px;
}

.realworld-story-card {
  text-align: left;
  border: 1px solid #dbe5f1;
  background:
    radial-gradient(circle at top right, rgba(45, 108, 223, 0.10), transparent 34%),
    #ffffff;
  border-radius: 20px;
  padding: 18px;
  min-height: 142px;
  box-shadow: 0 8px 24px rgba(23, 44, 77, 0.06);
  cursor: pointer;
  transition: all 0.2s ease;
}

.realworld-story-card:hover {
  transform: translateY(-2px);
  border-color: #b7cbef;
  box-shadow: 0 14px 32px rgba(23, 44, 77, 0.10);
}

.realworld-story-card.active {
  border-color: #2d6cdf;
  background:
    radial-gradient(circle at top right, rgba(18, 179, 166, 0.16), transparent 34%),
    #eaf2ff;
}

.realworld-story-icon {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background: #ffffff;
  margin-bottom: 12px;
  font-size: 20px;
  box-shadow: 0 6px 18px rgba(23, 44, 77, 0.08);
}

.realworld-story-title {
  display: block;
  color: #12263a;
  font-weight: 850;
  font-size: 17px;
  margin-bottom: 6px;
}

.realworld-story-card small {
  display: block;
  color: #5f748b;
  font-size: 13px;
  line-height: 1.48;
}

@media (max-width: 1100px) {
  .realworld-card-grid {
    grid-template-columns: 1fr;
  }

  .mode-tabs .replay-mode-btn {
    margin-left: 0;
  }
}
.canvas-card.content-mode-card {
  min-height: auto !important;
}

.canvas-card.content-mode-card #stage {
  display: none !important;
}

.canvas-card.content-mode-card .interaction,
.canvas-card.content-mode-card #interaction {
  margin-top: 0 !important;
}

.practice-shell {
  padding: 18px;
  width: 100%;
}

.practice-mode-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 14px 0 18px;
}

.practice-mode-btn {
  border: 1px solid #dbe5f1;
  background: #ffffff;
  color: #24364a;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 750;
  cursor: pointer;
}

.practice-mode-btn.active {
  color: #ffffff;
  border-color: transparent;
  background: linear-gradient(90deg, #2d6cdf 0%, #12b3a6 100%);
}

.practice-content {
  width: 100%;
}

.practice-empty {
  border: 1px solid #dbe5f1;
  background: #ffffff;
  border-radius: 18px;
  padding: 22px;
  color: #24364a;
}

/* Practice chapter dropdown (Exercises + Exemplar) */
.practice-chapter-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 0 18px;
}
.practice-chapter-picker label {
  font-weight: 750;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted, #5b6b7e);
}
.practice-chapter-select {
  flex: 1;
  max-width: 520px;
  border: 1px solid #dbe5f1;
  background: #ffffff;
  color: #24364a;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 650;
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.practice-chapter-select:hover { border-color: #2d6cdf; }
.practice-chapter-select:focus {
  outline: none;
  border-color: #2d6cdf;
  box-shadow: 0 0 0 3px rgba(45, 108, 223, 0.15);
}

/* Flash highlight when returning to a question after viewing its figure */
.exercise-card.question-flash {
  animation: karkaQuestionFlash 1.6s ease;
}
@keyframes karkaQuestionFlash {
  0%   { box-shadow: 0 0 0 0 rgba(45, 108, 223, 0.0); background: rgba(45,108,223,0.10); }
  25%  { box-shadow: 0 0 0 4px rgba(45, 108, 223, 0.35); background: rgba(45,108,223,0.10); }
  100% { box-shadow: 0 0 0 0 rgba(45, 108, 223, 0.0); background: transparent; }
}

/* Diya response rendered inside the Worked Example tab */
.worked-response { width: 100%; max-width: 860px; margin: 0 auto; padding: 4px 2px; }
.worked-response-head { padding: 4px 2px 14px; }
.worked-response-head h2 { font-family: "Fraunces", serif; font-size: 24px; margin: 0 0 4px; color: #1a2b3c; }
.worked-response-head p { margin: 0; color: #5b6b7e; font-size: 14px; }
.worked-response-block {
  border: 1px solid #dce5ef;
  background: #ffffff;
  border-radius: 16px;
  padding: 16px 18px;
  margin-bottom: 14px;
}
.worked-response-block.wr-formula { background: #fffaf0; border-color: #f0e2c4; }
.worked-response-block .wr-label {
  font-size: 12px; font-weight: 800; letter-spacing: 0.06em;
  color: #2d6cdf; margin-bottom: 6px;
}
.worked-response-block.wr-formula .wr-label { color: #b8860b; }
.worked-response-block .wr-body {
  font-size: 15px; line-height: 1.55; color: #24364a; white-space: pre-wrap;
}

/* Fix: keep the right-panel toggle on-screen regardless of content height.
   (Was top:50% of a very tall .content-grid, which pushed it far below the
   fold when Practice rendered a long question list.) */
.right-panel-toggle {
  position: fixed !important;
  top: 320px !important;
  transform: none !important;
}

/* Diya step-by-step worked solution (voice-driven) */
.worked-steps { margin: 4px 0 0; padding-left: 0; list-style: none; }
.worked-step {
  font-size: 15px; line-height: 1.55; color: #24364a;
  margin-bottom: 10px; padding-left: 0;
  display: flex; gap: 10px; align-items: baseline;
}
.worked-step::marker { content: ""; }   /* remove default "1." */
.worked-step-label {
  flex: 0 0 auto; font-weight: 800; color: #2d6cdf;
  min-width: 54px;
}
.worked-step-body { flex: 1 1 auto; }

/* Diya live figure in the Worked Example panel */
.worked-figure-slot { margin: 6px 0 14px; display: flex; flex-direction: column; align-items: center; }
.worked-figure-svg { width: 360px; max-width: 100%; height: auto; background: #fff; border: 1px solid #e3e8ef; border-radius: 12px; }
.worked-figure-caption { font-size: 13px; color: #5a6b7e; margin-top: 6px; font-style: italic; }
.fig-grid { stroke: #eef2f7; stroke-width: 1; }
.fig-axis { stroke: #24364a; stroke-width: 1.6; }
.fig-axis-label { font: 600 12px system-ui, sans-serif; fill: #24364a; }
.fig-helper { stroke: #2d6cdf; stroke-width: 1.4; stroke-dasharray: 6 4; }
.fig-mirror { stroke: #8a5cf6; stroke-width: 2; }
.fig-seg { stroke: #2d6cdf; stroke-width: 2.2; }
.fig-leg { stroke: #f59e0b; stroke-width: 2.2; }
.fig-hyp { stroke: #16a34a; stroke-width: 2.4; }
.fig-quad { fill: #2d6cdf; opacity: 0.06; }
.fig-point { fill: #16a34a; stroke: #fff; stroke-width: 1.5; }
.fig-point-image { fill: #8a5cf6; stroke: #fff; stroke-width: 1.5; }
.fig-point-label { font: 600 11px system-ui, sans-serif; fill: #24364a; }
.fig-label { font: 600 12px system-ui, sans-serif; fill: #44566a; }

/* Attachment send status */
.attachment-preview { margin-top: 8px; font-size: 13px; color: #2d6cdf; }
.attachment-preview.attach-error { color: #c0392b; }

/* "Diya is working…" heartbeat in the Worked Example panel */
.diya-working { display: flex; align-items: center; gap: 10px; padding: 14px 4px; color: #2d6cdf; font-size: 14px; }
.diya-working-dots { display: inline-flex; gap: 4px; }
.diya-working-dots i { width: 7px; height: 7px; border-radius: 50%; background: #2d6cdf; display: inline-block; opacity: 0.35; animation: diyaWorkingPulse 1s infinite ease-in-out; }
.diya-working-dots i:nth-child(2) { animation-delay: 0.18s; }
.diya-working-dots i:nth-child(3) { animation-delay: 0.36s; }
@keyframes diyaWorkingPulse { 0%, 100% { opacity: 0.3; transform: translateY(0); } 50% { opacity: 1; transform: translateY(-3px); } }

/* Fix: worked-example content must render as a full-height, scrollable block,
   not a vertically-centered flex item (which clipped long answers). */
.interaction-panel:has(.worked-response) {
  display: block;
  align-items: stretch;
  overflow: visible;
}
.canvas-card.content-mode-card {
  overflow-y: auto;            /* allow long worked answers to scroll */
}
.worked-response { padding-bottom: 24px; }   /* breathing room at the end */

/* Light markdown-ish formatting for n8n answers so **bold**, lists, and line
   breaks render readably instead of as literal characters. */
.wr-body strong, .worked-step strong { font-weight: 700; color: #1a2b3c; }
.wr-body em { font-style: italic; }
.wr-body ul, .wr-body ol { margin: 6px 0 6px 20px; padding: 0; }
.wr-body li { margin: 3px 0; }
.wr-body p { margin: 0 0 8px; }
.wr-body p:last-child { margin-bottom: 0; }

/* Phase 2 figure primitives */
.fig-polygon { fill: rgba(45,108,223,0.06); stroke: #2d6cdf; stroke-width: 2.2; stroke-linejoin: round; }
.fig-circle { fill: rgba(22,163,74,0.05); stroke: #16a34a; stroke-width: 2.2; }
.fig-angle-arc { fill: none; stroke: #f59e0b; stroke-width: 2; }
.fig-arc { fill: none; stroke: #8a5cf6; stroke-width: 2.2; }
.fig-sector { fill: rgba(138,92,246,0.12); stroke: #8a5cf6; stroke-width: 2; }

/* =========================
   FORMULAS PANEL CLEANUP
   ========================= */


.formula-bank-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding-top: 0;
}

.formula-bank-title {
  text-align: center;
  font-size: 22px;
  font-weight: 800;
  color: #10233f;
  margin: 0 0 20px 0;
}

.formula-bank-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.formula-bank-item {
  background: #f4f7fb;
  border: 1px solid #d9e3f0;
  border-radius: 14px;
  padding: 14px 18px;
  text-align: center;
  font-size: 15px;
  font-weight: 700;
  color: #20324d;
  line-height: 1.45;
  box-shadow: 0 1px 2px rgba(16, 35, 63, 0.04);
}
.brand-wordmark {
  font-family: Inter, Arial, sans-serif;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -1.4px;
  line-height: 1;
  margin: 0;
  white-space: nowrap;
}

.brand-wordmark .brand-karka {
  color:  #ffffff;
}

.brand-wordmark .brand-labs {
  color: #7d8f5f;
  font-weight: 700;
}

.brand-wordmark sup {
  font-size: 8px;
  font-weight: 700;
  margin-left: 3px;
  position: relative;
  top: -0.9em;
  color: #7d8f5f;
  letter-spacing: 0;
}

.chapter-pill {
  display: none !important;
}

/* ============================================================
   KARKA FINAL SIDEBAR FIX
   Structure:
   #appShell = left sidebar + main lesson
   .content-grid = centre panel + Diya panel
   ============================================================ */

:root {
  --karka-sidebar-width: 320px;
  --karka-diya-width: 360px;
  --karka-content-gap: 18px;
}

/* Prevent horizontal page drift */
html,
body {
  overflow-x: hidden;
}

/* OUTER GRID: sidebar + lesson */
html body #appShell.app-shell {
  display: grid !important;
  grid-template-columns: var(--karka-sidebar-width) minmax(0, 1fr) !important;
  width: 100% !important;
  max-width: none !important;
}

/* Sidebar fixed width in expanded state */
html body #appShell.app-shell > aside.sidebar {
  width: var(--karka-sidebar-width) !important;
  min-width: var(--karka-sidebar-width) !important;
  max-width: var(--karka-sidebar-width) !important;
  box-sizing: border-box !important;
}

/* Main lesson column must take remaining width */
html body #appShell.app-shell > main.lesson {
  min-width: 0 !important;
  width: 100% !important;
  max-width: none !important;
}

/* INNER GRID: centre learning card + Diya panel */
html body #appShell.app-shell .content-grid {
  display: grid !important;
  grid-template-columns: minmax(0, 1fr) var(--karka-diya-width) !important;
  gap: var(--karka-content-gap) !important;

  width: 100% !important;
  max-width: none !important;
  min-width: 0 !important;
}

/* Prevent cards from forcing horizontal overflow */
html body #appShell.app-shell .canvas-card,
html body #appShell.app-shell .explain-card {
  min-width: 0 !important;
  max-width: none !important;
}

/* Student card: match chapter boxes.
   Sidebar already has 20px padding, so no side margin is needed. */
html body #appShell.app-shell > aside.sidebar > .student-card {
  width: 100% !important;
  max-width: none !important;
  min-width: 0 !important;

  margin: 18px 0 20px 0 !important;
  padding: 18px 22px !important;

  box-sizing: border-box !important;
  align-self: stretch !important;
}

/* Hide chapter pill below student card */
html body #appShell.app-shell > aside.sidebar > .chapter-pill {
  display: none !important;
}

/* Floating sidebar collapse arrow */
html body #collapseSidebarBtn.collapse-btn {
  position: fixed !important;
  top: 50% !important;
  left: calc(var(--karka-sidebar-width) - 16px) !important;
  transform: translateY(-50%) !important;

  width: 32px !important;
  height: 58px !important;
  min-width: 32px !important;

  margin: 0 !important;
  padding: 0 !important;

  display: flex !important;
  align-items: center !important;
  justify-content: center !important;

  border-radius: 999px !important;
  border: 1px solid rgba(148, 163, 184, 0.35) !important;
  background: rgba(255, 255, 255, 0.96) !important;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.22) !important;

  color: #0f172a !important;
  font-size: 24px !important;
  font-weight: 800 !important;
  line-height: 1 !important;

  cursor: pointer !important;
  z-index: 9999 !important;
}

html body #collapseSidebarBtn.collapse-btn:hover {
  background: #ffffff !important;
}

html body #sidebarCollapseIcon {
  display: block !important;
  line-height: 1 !important;
}

/* COLLAPSED STATE:
   sidebar column becomes 0;
   lesson gets the released width */
html body #appShell.app-shell.sidebar-collapsed {
  grid-template-columns: 0 minmax(0, 1fr) !important;
}

/* Fully hide sidebar panel */
html body #appShell.app-shell.sidebar-collapsed > aside.sidebar {
  width: 0 !important;
  min-width: 0 !important;
  max-width: 0 !important;

  padding: 0 !important;
  margin: 0 !important;
  border: 0 !important;

  background: transparent !important;
  box-shadow: none !important;

  overflow: visible !important;
}

/* Hide sidebar contents except collapse button */
html body #appShell.app-shell.sidebar-collapsed > aside.sidebar > :not(#collapseSidebarBtn) {
  display: none !important;
}

/* Move arrow to far left when collapsed */
html body #appShell.app-shell.sidebar-collapsed #collapseSidebarBtn.collapse-btn {
  left: 14px !important;
}

/* Keep centre + Diya layout stable after sidebar collapse */
html body #appShell.app-shell.sidebar-collapsed .content-grid {
  grid-template-columns: minmax(0, 1fr) var(--karka-diya-width) !important;
}

/* Right panel collapse button position */
html body #appShell.app-shell .right-panel-toggle {
  right: calc(var(--karka-diya-width) + var(--karka-content-gap) - 14px) !important;
}

/* If Diya panel itself is collapsed */
/* When Diya/right panel is collapsed, centre panel gets full inner width */
html body #appShell.app-shell .content-grid.right-collapsed {
  grid-template-columns: minmax(0, 1fr) 0 !important;
  gap: 0 !important;
}

/* Fully hide Diya panel */
html body #appShell.app-shell .content-grid.right-collapsed #rightPanel {
  width: 0 !important;
  min-width: 0 !important;
  max-width: 0 !important;

  padding: 0 !important;
  margin: 0 !important;
  border: 0 !important;

  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  overflow: hidden !important;
}

/* Keep the right-panel toggle visible at the far right */
html body #appShell.app-shell .content-grid.right-collapsed .right-panel-toggle {
  right: 14px !important;
}

/* ============================================================
   FIXED LEFT SIDEBAR WHILE LESSON CONTENT SCROLLS
   Add this at the very bottom of styles.css
   ============================================================ */

/* Lock the app to viewport height */
html,
body {
  height: 100%;
}

/* Prevent the whole browser page from moving horizontally */
body {
  overflow-x: hidden;
}

/* Main shell stays viewport-height */
html body #appShell.app-shell {
  min-height: 100vh !important;
}

/* Sidebar remains fixed/sticky in place */
html body #appShell.app-shell > aside.sidebar {
  height: 100vh !important;
  max-height: 100vh !important;
  position: sticky !important;
  top: 0 !important;
  align-self: start !important;
  overflow: hidden !important;
  z-index: 50 !important;
}

/* Only the chapter/subtopic list scrolls inside the sidebar */
html body #appShell.app-shell > aside.sidebar .concept-nav {
  flex: 1 1 auto !important;
  min-height: 0 !important;
  overflow-y: auto !important;
  overflow-x: hidden !important;
  padding-right: 4px !important;
}

/* Keep logout fixed at bottom of sidebar */
html body #appShell.app-shell > aside.sidebar .logout-btn {
  flex: 0 0 auto !important;
  margin-top: auto !important;
}

/* Lesson area can scroll normally */
html body #appShell.app-shell > main.lesson {
  min-height: 100vh !important;
}

/* ============================================================
   FINAL TOGGLE BUTTON POSITION + SIZE REFINEMENT
   1. Right panel button sits exactly on left edge of Diya panel
   2. Left sidebar collapse button made smaller / cleaner
   ============================================================ */

/* Make content grid the positioning reference for the right panel toggle */
html body #appShell.app-shell .content-grid {
  position: relative !important;
}

/* Right panel collapse button:
   sits exactly on the left edge of the Diya/right panel */
html body #appShell.app-shell .right-panel-toggle {
  position: absolute !important;
  top: 50% !important;

  /*
    Right panel width = --karka-diya-width.
    Button width = 32px.
    So right = panel width - half button width.
  */
  right: calc(var(--karka-diya-width) - 16px) !important;

  transform: translateY(-50%) !important;

  width: 32px !important;
  height: 58px !important;
  min-width: 32px !important;
  padding: 0 !important;

  display: flex !important;
  align-items: center !important;
  justify-content: center !important;

  border-radius: 999px !important;
  background: rgba(255, 255, 255, 0.96) !important;
  border: 1px solid rgba(148, 163, 184, 0.35) !important;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18) !important;

  color: #2563eb !important;
  font-size: 18px !important;
  font-weight: 800 !important;

  z-index: 80 !important;
}

/* ============================================================
   FINAL: MATCH LEFT + RIGHT COLLAPSE BUTTONS
   Same size, same vertical alignment, proper edge placement
   ============================================================ */

:root {
  --karka-toggle-w: 28px;
  --karka-toggle-h: 48px;
}

/* Shared toggle pill styling */
html body #collapseSidebarBtn.collapse-btn,
html body #appShell.app-shell .right-panel-toggle {
  width: var(--karka-toggle-w) !important;
  height: var(--karka-toggle-h) !important;
  min-width: var(--karka-toggle-w) !important;
  min-height: var(--karka-toggle-h) !important;

  padding: 0 !important;
  margin: 0 !important;

  display: flex !important;
  align-items: center !important;
  justify-content: center !important;

  border-radius: 999px !important;
  border: 1px solid rgba(148, 163, 184, 0.35) !important;
  background: rgba(255, 255, 255, 0.96) !important;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18) !important;

  color: #2563eb !important;
  font-size: 18px !important;
  font-weight: 800 !important;
  line-height: 1 !important;

  z-index: 9999 !important;
}

/* Left sidebar button: fixed on right edge of left sidebar */
html body #collapseSidebarBtn.collapse-btn {
  position: fixed !important;
  top: 50% !important;
  left: calc(var(--karka-sidebar-width) - (var(--karka-toggle-w) / 2)) !important;
  transform: translateY(-50%) !important;
}

/* When left sidebar is collapsed, move left button to page edge */
html body #appShell.app-shell.sidebar-collapsed #collapseSidebarBtn.collapse-btn {
  left: 10px !important;
}

/* Right panel button: attach to left edge of Diya panel */
html body #appShell.app-shell .content-grid {
  position: relative !important;
}

html body #appShell.app-shell .right-panel-toggle {
  position: absolute !important;
  top: 50% !important;

  /*
    Diya panel width = --karka-diya-width.
    Button sits half over the panel edge.
  */
  right: calc(var(--karka-diya-width) - (var(--karka-toggle-w) / 2)) !important;

  transform: translateY(-50%) !important;
}

/* When Diya panel is collapsed, keep right button on far-right edge */
html body #appShell.app-shell .content-grid.right-collapsed .right-panel-toggle {
  right: 10px !important;
}

/* Normalise arrow icon inside both buttons */
html body #sidebarCollapseIcon,
html body .right-panel-toggle .rpt-chevron {
  font-size: 18px !important;
  line-height: 1 !important;
  display: block !important;
}

/* When right panel is collapsed, keep the right toggle at far-right edge */
html body #appShell.app-shell .content-grid.right-collapsed .right-panel-toggle {
  right: 14px !important;
}

/* Reduce the LEFT sidebar collapse button size */
html body #collapseSidebarBtn.collapse-btn {
  width: 28px !important;
  height: 48px !important;
  min-width: 28px !important;

  /*
    If sidebar width is 320px:
    button sits half-in / half-out of sidebar edge.
  */
  left: calc(var(--karka-sidebar-width) - 14px) !important;

  border-radius: 999px !important;
  font-size: 18px !important;
  padding: 0 !important;
}

/* When left sidebar is collapsed, keep the smaller button on the far-left edge */
html body #appShell.app-shell.sidebar-collapsed #collapseSidebarBtn.collapse-btn {
  left: 10px !important;
}

/* Slightly reduce arrow icon weight/position */
html body #sidebarCollapseIcon {
  font-size: 18px !important;
  line-height: 1 !important;
}

/* Practice-mode fix: keep toggle on-screen even when grid is tall.
   position:fixed measures `right` from the VIEWPORT edge, so the value must
   account for everything between the viewport's right edge and the Diya
   panel's left seam:
     - lesson right padding ............ 36px  (main.lesson padding: 32px 36px)
     - Diya panel width ................ var(--karka-diya-width)   (360px)
     - inner grid gap .................. var(--karka-content-gap)  (18px)
   then offset back by half the pill width to straddle the seam. */
html body #appShell.app-shell .right-panel-toggle {
  position: fixed !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  right: calc(36px + var(--karka-diya-width) + var(--karka-content-gap) - (var(--karka-toggle-w) / 2)) !important;
}

/* Collapsed Diya panel: pin toggle just inside the far-right edge.
   Still fixed, so this is measured from the viewport edge — sits at the
   lesson's right padding line. */
html body #appShell.app-shell .content-grid.right-collapsed .right-panel-toggle {
  right: calc(36px + 14px) !important;
}

/* Combined "figure + steps" view (Diya's showFigure): figure on the stage
   above, step-by-step solution in the interaction panel below — no toggling. */
body.karka-figure-with-steps .canvas-card #stage {
  display: block !important;          /* keep the figure visible */
  height: clamp(300px, 42vh, 440px);  /* shrink so steps fit below */
  flex: 0 0 auto;
}
body.karka-figure-with-steps .canvas-card .interaction-panel {
  display: block;
  align-items: stretch;
  max-height: 38vh;
  overflow-y: auto;
  padding-top: 10px;
  border-top: 1px solid var(--karka-line, #dbe5f1);
  margin-top: 8px;
}
body.karka-figure-with-steps .canvas-card.content-mode-card #stage {
  display: block !important;          /* defeat the content-mode hide rule */
}

.worked-figure-svg .fig-area-label  { font-weight:800; font-size:16px; fill:#17283d; }
.worked-figure-svg .fig-area-side   { font-weight:700; font-size:14px; fill:#60748a; }
.worked-figure-svg .fig-area-bracket{ stroke:#60748a; stroke-width:1.5; }

/* JSXGraph board for Diya's drawGraph (function/curve plotting) */
.karka-graph-box { width: 100%; max-width: 460px; height: 360px; margin: 4px auto 8px; border: 1px solid #e8eef6; border-radius: 14px; background: #fff; }