/* ============================================
   Learn.edu — Design System v3
   Inspired by: family.co
   Clean white · Bold type · Lots of space
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Nunito:wght@400;600;700;800;900&display=swap');

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

:root {
  --math:       #E8562A;
  --math-bg:    #FFF0EB;
  --sci:        #059669;
  --sci-bg:     #ECFDF5;
  --spa:        #D97706;
  --spa-bg:     #FFFBEB;
  --ok:         #059669;
  --ok-bg:      #ECFDF5;
  --error:      #DC2626;
  --error-bg:   #FEF2F2;
  --bg:         #FFFFFF;
  --surface:    #F7F7F7;
  --card:       #FFFFFF;
  --border:     #EBEBEB;
  --text:       #0A0A0A;
  --muted:      #6B7280;
  --radius:     16px;
  --shadow:     0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.05);
  --shadow-lg:  0 4px 6px rgba(0,0,0,0.05), 0 10px 40px rgba(0,0,0,0.10);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Nav ──────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}
.nav-logo img {
  height: 34px;
  width: auto;
  display: block;
}
.logo-wordmark {
  font-family: 'Inter', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  line-height: 1;
}

.nav-back {
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 7px 16px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
  font-size: 0.85rem;
  transition: all 0.15s;
}
.nav-back:hover { border-color: var(--text); color: var(--text); }

/* ── Home ─────────────────────────────────── */
.hero {
  position: relative;
  padding: 56px 0 48px;
  min-height: 410px;
  overflow: hidden;
}
.hero-text {
  position: relative;
  z-index: 2;
  max-width: 500px;
}
.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--sci);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.hero-label::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--sci);
  display: inline-block;
}
.hero h1 {
  font-family: 'Inter', sans-serif;
  font-size: clamp(2.4rem, 7vw, 3.8rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -2px;
  color: var(--text);
}
.hero h1 .accent     { color: var(--math); }
.hero h1 .accent-sci { color: var(--sci);  }
.hero p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  gap: 10px;
  margin-top: 28px;
  flex-wrap: wrap;
}

/* ── Doodle layer ────────────────────────── */
.hero-doodles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: visible;
}
.doodle {
  position: absolute;
  pointer-events: none;
  user-select: none;
  filter: drop-shadow(0 3px 6px rgba(0,0,0,0.09));
}

/* Float animations — each doodle gets a different one */
@keyframes floatA {
  0%,100% { transform: translateY(0px)   rotate(-8deg); }
  50%      { transform: translateY(-14px) rotate(4deg);  }
}
@keyframes floatB {
  0%,100% { transform: translateY(0px)  rotate(5deg);  }
  50%      { transform: translateY(-10px) rotate(-5deg); }
}
@keyframes floatC {
  0%,100% { transform: translateY(0px)   rotate(0deg);  }
  50%      { transform: translateY(-18px) rotate(10deg); }
}
@keyframes floatD {
  0%,100% { transform: translateY(0px)  rotate(12deg); }
  50%      { transform: translateY(-8px) rotate(-2deg); }
}
@keyframes floatE {
  0%,100% { transform: translateY(0px)  rotate(-3deg); }
  50%      { transform: translateY(-20px) rotate(6deg); }
}
.d1 { animation: floatA 4.0s ease-in-out infinite 0.0s; }
.d2 { animation: floatB 3.5s ease-in-out infinite 0.6s; }
.d3 { animation: floatC 5.0s ease-in-out infinite 1.2s; }
.d4 { animation: floatA 4.5s ease-in-out infinite 1.8s; }
.d5 { animation: floatD 3.2s ease-in-out infinite 0.4s; }
.d6 { animation: floatE 4.8s ease-in-out infinite 2.1s; }
.d7 { animation: floatB 3.8s ease-in-out infinite 0.9s; }
.d8 { animation: floatC 4.2s ease-in-out infinite 1.5s; }

@media (max-width: 640px) {
  .hero-doodles { display: none; }
  .hero { padding: 48px 0 40px; min-height: auto; }
}

/* ── Subject cards (home grid) ────────────── */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 8px;
}

.subject-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px 24px;
  cursor: pointer;
  border: 1.5px solid var(--border);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}
.subject-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
}
.subject-card.math::before    { background: var(--math); }
.subject-card.science::before { background: var(--sci);  }
.subject-card.spanish::before { background: var(--spa);  }

.subject-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.subject-card .s-icon {
  font-size: 2.2rem;
  line-height: 1;
}
.subject-card h2 {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.3px;
}
.subject-card p {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.5;
}
.subject-card .s-arrow {
  margin-top: auto;
  font-size: 0.8rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s;
}
.subject-card.math    .s-arrow { color: var(--math); }
.subject-card.science .s-arrow { color: var(--sci);  }
.subject-card.spanish .s-arrow { color: var(--spa);  }
.subject-card:hover .s-arrow   { gap: 8px; }

/* Home stats bar */
.home-stats {
  display: flex;
  gap: 0;
  margin-top: 14px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  overflow: hidden;
}
.stat {
  flex: 1;
  padding: 16px 20px;
  border-right: 1.5px solid var(--border);
  text-align: center;
}
.stat:last-child { border-right: none; }
.stat .num {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--math);
  letter-spacing: -1px;
}
.stat .lbl {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  margin-top: 2px;
}

/* Divider */
.section-divider {
  border: none;
  border-top: 1.5px solid var(--border);
  margin: 48px 0 36px;
}

/* ── Subject page ─────────────────────────── */
.subject-header { padding: 40px 0 28px; }
.subject-header h1 {
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -1.5px;
  line-height: 1.1;
}
.subject-header p {
  color: var(--muted);
  font-weight: 500;
  margin-top: 6px;
  font-size: 0.95rem;
}

.grade-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.grade-tab {
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s;
}
.grade-tab:disabled { opacity: 0.4; cursor: not-allowed; }
.grade-tab.active,
.grade-tab:not(:disabled):hover {
  border-color: var(--math);
  color: var(--math);
  background: var(--math-bg);
}

/* Lesson cards */
.lessons-grid { display: grid; gap: 8px; }

.lesson-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  border: 1.5px solid var(--border);
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 14px;
}
.lesson-card:hover {
  border-color: #C8C8C8;
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.l-icon {
  font-size: 1.6rem;
  background: var(--surface);
  border-radius: 10px;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.l-info { flex: 1; min-width: 0; }
.l-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.l-info p { color: var(--muted); font-size: 0.8rem; font-weight: 500; margin-top: 2px; }

.l-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; flex-shrink: 0; }
.duration { font-size: 0.75rem; color: var(--muted); font-weight: 600; }

.difficulty { display: flex; gap: 3px; }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--border); }
.dot.on { background: var(--math); }

.xp-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  background: #FFF8E1;
  border: 1px solid #FFD54F;
  color: #F59E0B;
  border-radius: 999px;
  padding: 2px 8px;
  font-weight: 700;
  font-size: 0.75rem;
}

/* ── Lesson page ──────────────────────────── */
.lesson-header { padding: 36px 0 20px; }
.breadcrumb {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.lesson-header h1 {
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.15;
}
.lesson-header .sub {
  color: var(--muted);
  font-weight: 500;
  margin-top: 4px;
  font-size: 0.92rem;
}

/* Steps */
.steps {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
}
.step { display: flex; align-items: center; gap: 7px; }
.step-dot {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.78rem;
  flex-shrink: 0;
  transition: all 0.2s;
}
.step-dot.done   { background: var(--text); color: white; }
.step-dot.active { background: var(--text); color: white; box-shadow: 0 0 0 4px rgba(10,10,10,0.12); }
.step-dot.idle   { background: var(--surface); border: 1.5px solid var(--border); color: var(--muted); }
.step-lbl { font-weight: 600; font-size: 0.8rem; color: var(--muted); }
.step.active .step-lbl { color: var(--text); font-weight: 700; }
.step-line { flex: 1; height: 1.5px; background: var(--border); min-width: 24px; }
.step-line.done { background: var(--text); }

/* Progress bar */
.progress-bar {
  background: var(--surface);
  border-radius: 999px;
  height: 4px;
  margin-bottom: 32px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--text);
  transition: width 0.5s ease;
}

/* Intro */
.video-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  background: #111;
  position: relative;
  padding-top: 56.25%;
  margin-bottom: 16px;
}
.video-wrap iframe {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%; border: none;
}
.video-placeholder {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  background: var(--text);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  color: white; gap: 10px;
}
.video-placeholder .play { font-size: 3rem; }
.video-placeholder strong { font-size: 1.05rem; font-weight: 800; }
.video-placeholder small { opacity: 0.5; font-weight: 500; font-size: 0.82rem; }

.intro-box {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 22px 24px;
  border: 1.5px solid var(--border);
  margin-bottom: 24px;
}
.intro-box h3 { font-size: 1rem; font-weight: 800; margin-bottom: 8px; letter-spacing: -0.2px; }
.intro-box p  { color: var(--muted); font-weight: 500; line-height: 1.7; font-size: 0.92rem; }

/* Practice / Quiz */
.problem-counter {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.problem-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  border: 1.5px solid var(--border);
  margin-bottom: 12px;
}
.problem-q {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 18px;
  line-height: 1.4;
  letter-spacing: -0.3px;
}

.choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.c-btn {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 13px 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.12s;
  text-align: center;
}
.c-btn:hover:not(:disabled) {
  border-color: var(--text);
  background: var(--text);
  color: white;
}
.c-btn.correct { border-color: var(--ok);    background: var(--ok-bg);    color: #047857; }
.c-btn.wrong   { border-color: var(--error); background: var(--error-bg); color: #B91C1C; }
.c-btn:disabled { cursor: default; }

.fill-row { display: flex; gap: 8px; }
.fill-input {
  flex: 1;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 13px 16px;
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}
.fill-input:focus   { border-color: var(--text);  background: #FAFAFA; }
.fill-input.correct { border-color: var(--ok);   background: var(--ok-bg);   }
.fill-input.wrong   { border-color: var(--error); background: var(--error-bg); }

.check-btn {
  background: var(--text);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 13px 22px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s;
}
.check-btn:hover { opacity: 0.85; }
.check-btn:disabled { opacity: 0.4; cursor: default; }

.hint { margin-top: 8px; font-size: 0.8rem; color: var(--muted); font-weight: 600; }

.feedback {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.88rem;
  display: none;
  align-items: center;
  gap: 7px;
}
.feedback.correct { background: var(--ok-bg);    color: #047857; display: flex; }
.feedback.wrong   { background: var(--error-bg); color: #B91C1C; display: flex; }

/* ── Buttons ──────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 12px 22px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--text);
  color: white;
}
.btn-primary:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-success {
  background: var(--ok);
  color: white;
}
.btn-success:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-ghost {
  background: var(--surface);
  color: var(--muted);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { color: var(--text); border-color: var(--text); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--text); }

.action-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }

/* ── Score / Completion ───────────────────── */
.score-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 40px 28px;
  text-align: center;
  border: 1.5px solid var(--border);
}
.score-emoji { font-size: 3.5rem; margin-bottom: 12px; }
.score-card h2 {
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 6px;
}
.score-card p { color: var(--muted); font-weight: 500; font-size: 0.95rem; }
.score-num {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: -3px;
  color: var(--text);
  margin: 16px 0 4px;
  line-height: 1;
}
.score-sub { font-size: 0.82rem; color: var(--muted); font-weight: 600; }

/* ── Empty / 404 ──────────────────────────── */
.empty { text-align: center; padding: 56px 0; color: var(--muted); font-weight: 600; }
.empty .e-icon { font-size: 2.8rem; margin-bottom: 10px; }

/* ── Animations ───────────────────────────── */
@keyframes pop {
  0%   { transform: scale(0.9); opacity: 0; }
  60%  { transform: scale(1.02); }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes fadeUp {
  from { transform: translateY(10px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}
.pop    { animation: pop    0.25s ease forwards; }
.fadeUp { animation: fadeUp 0.28s ease forwards; }

/* ── Responsive ───────────────────────────── */
@media (max-width: 580px) {
  .choices { grid-template-columns: 1fr; }
  .steps .step-lbl { display: none; }
  .home-stats { flex-direction: column; }
  .stat { border-right: none; border-bottom: 1.5px solid var(--border); }
  .stat:last-child { border-bottom: none; }
  .hero h1 { letter-spacing: -1.5px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { justify-content: center; }
}

/* ── Lesson code badge ─────────────────────── */
.lesson-code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--math);
  background: var(--math-bg);
  border: 1px solid #FDDACF;
  border-radius: 6px;
  padding: 2px 7px;
  letter-spacing: 0.03em;
  white-space: nowrap;
  flex-shrink: 0;
}
.inline-code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 7px;
  font-family: monospace;
  font-size: 0.85rem;
}

/* ── Search ────────────────────────────────── */
.search-bar-wrap { margin-top: 8px; }
.search-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 12px 16px;
  transition: border-color 0.15s;
}
.search-bar:focus-within {
  border-color: var(--text);
  background: white;
}
.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  outline: none;
}
.search-input::placeholder { color: var(--muted); }
.search-clear {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 1.2rem;
  padding: 0 2px;
  line-height: 1;
}
.search-clear:hover { color: var(--text); }

/* Nav icon button */
.nav-icon-btn {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s;
}
.nav-icon-btn:hover { border-color: var(--text); color: var(--text); }

/* ── Teacher Dashboard ─────────────────────── */
.ds-stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
@media (max-width: 640px) { .ds-stats { grid-template-columns: repeat(3, 1fr); } }

.ds-stat-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 16px 14px;
  text-align: center;
}
.ds-stat-num {
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1;
}
.ds-stat-lbl {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ds-table-wrap {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  overflow-x: auto;
}
.ds-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.ds-table thead th {
  background: var(--surface);
  padding: 11px 16px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-bottom: 1.5px solid var(--border);
  white-space: nowrap;
}
.ds-row td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.ds-row:last-child td { border-bottom: none; }
.ds-row:hover { background: var(--surface); }

.ds-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: white;
  flex-shrink: 0;
}

.ds-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
}
.ds-badge.top    { background: #FEF3C7; color: #D97706; }
.ds-badge.active { background: var(--ok-bg); color: var(--ok); }
.ds-badge.help   { background: #FFF7ED; color: #EA580C; }
.ds-badge.risk   { background: var(--error-bg); color: var(--error); }

/* ── Phosphor Bold doodle cards ────────────── */
.doodle-card {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.09);
}

/* ── Spark Assessment ──────────────────────── */
.spark-q-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 640px;
  overflow-y: auto;
  padding-right: 4px;
}
.spark-q-list::-webkit-scrollbar { width: 4px; }
.spark-q-list::-webkit-scrollbar-track { background: var(--surface); border-radius:99px; }
.spark-q-list::-webkit-scrollbar-thumb { background: var(--border); border-radius:99px; }

.spark-q-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  transition: border-color 0.15s;
}
.spark-q-row:hover { border-color: #C8C8C8; }

.spark-q-num {
  width: 28px; height: 28px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 800;
  flex-shrink: 0; margin-top: 2px;
}
.spark-q-body { flex: 1; min-width: 0; }
.spark-q-text {
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}
.spark-q-pct {
  flex-shrink: 0;
  width: 72px;
  text-align: right;
}

/* Difficulty dots */
.spark-diff { font-size: 10px; }
.spark-diff.easy { color: var(--sci); }
.spark-diff.med  { color: var(--spa); }
.spark-diff.hard { color: var(--error); }

/* Student tags */
.spark-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  white-space: nowrap;
}
.spark-tag.improved     { background:#ECFDF5; color:#059669; }
.spark-tag.went-down    { background:#FEF2F2; color:#DC2626; }
.spark-tag.on-fire      { background:#FFF7ED; color:#EA580C; }
.spark-tag.rushed       { background:#F5F3FF; color:#7C3AED; }
.spark-tag.needs-review { background:#FEF2F2; color:#DC2626; }
.spark-tag.consistent   { background:#EFF6FF; color:#2563EB; }
.spark-tag.fast-sharp   { background:#ECFDF5; color:#059669; }

@media (max-width: 680px) {
  .spark-q-list { max-height: none; }
}

/* ── Zen Background ────────────────────────── */
.zen-bg {
  position: relative;
  background: linear-gradient(150deg, #f0fdf4 0%, #f5f3ff 45%, #fff7ed 100%);
  border-radius: 24px;
  padding: 28px;
  margin-top: 8px;
  overflow: hidden;
}
.zen-blob {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(60px);
  opacity: 0.45;
}
.zen-blob-1 { width:320px;height:320px;background:#bbf7d0;top:-80px;right:-60px; }
.zen-blob-2 { width:280px;height:280px;background:#ddd6fe;bottom:-60px;left:-40px; }
.zen-blob-3 { width:200px;height:200px;background:#fed7aa;top:40%;right:30%; }

.zen-card {
  background: rgba(255,255,255,0.75) !important;
  backdrop-filter: blur(8px);
  border: 1.5px solid rgba(255,255,255,0.9) !important;
}

/* ── Spark filter tabs ─────────────────────── */
.spark-filter-btn {
  background: rgba(255,255,255,0.7);
  border: 1.5px solid rgba(0,0,0,0.08);
  border-radius: 999px;
  padding: 4px 12px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.75rem;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s;
}
.spark-filter-btn:hover,
.spark-filter-btn.active {
  background: var(--text);
  color: white;
  border-color: var(--text);
}

/* ── Spark choice buttons ──────────────────── */
.spark-choice-btn:hover:not(:disabled) {
  border-color: #E8562A !important;
  background: #fff7f5 !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(232,86,42,0.12);
}

/* ── Performance level badges ──────────────── */
.spark-level {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  white-space: nowrap;
}
.spark-level.above    { background:#FEF9C3;color:#CA8A04; }
.spark-level.on-level { background:#DBEAFE;color:#2563EB; }
.spark-level.declining{ background:#FEF2F2;color:#DC2626; }

/* ── Spark Homepage Promo ──────────────────── */
.spark-promo {
  display: flex;
  align-items: center;
  gap: 20px;
  background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 50%, #fff0eb 100%);
  border: 1.5px solid #FDDACF;
  border-radius: 20px;
  padding: 24px;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.15s;
  flex-wrap: wrap;
}
.spark-promo:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

.spark-promo-icon {
  background: white;
  border-radius: 16px;
  width: 56px; height: 56px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 12px rgba(232,86,42,0.2);
  flex-shrink: 0;
}
.spark-promo-body { flex: 1; min-width: 200px; }

@media (max-width: 580px) {
  .spark-promo { flex-direction: column; align-items: flex-start; }
  .zen-bg { padding: 18px; border-radius: 16px; }
}