:root {
  --bg: #f4efe5;
  --bg-deep: #efe4d0;
  --surface: rgba(255, 251, 245, 0.84);
  --surface-strong: rgba(255, 250, 242, 0.96);
  --stroke: rgba(64, 46, 27, 0.1);
  --text: #22160c;
  --muted: #6c5a4a;
  --accent: #e06b2d;
  --accent-strong: #ba4313;
  --accent-soft: rgba(224, 107, 45, 0.14);
  --success: #13795b;
  --danger: #a43a18;
  --shadow: 0 24px 60px rgba(58, 37, 16, 0.12);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 196, 107, 0.35), transparent 28%),
    radial-gradient(circle at bottom right, rgba(222, 126, 80, 0.24), transparent 24%),
    linear-gradient(140deg, #f7f2e8 0%, #efe3cf 55%, #f8efe2 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(91, 68, 39, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 68, 39, 0.03) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
  mask-image: radial-gradient(circle at center, black 55%, transparent 88%);
}

.page-shell {
  position: relative;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.ambient {
  position: absolute;
  z-index: 0;
  border-radius: 999px;
  filter: blur(10px);
  opacity: 0.7;
}

.ambient-left {
  width: 260px;
  height: 260px;
  top: 3rem;
  left: -5rem;
  background: linear-gradient(135deg, rgba(255, 197, 114, 0.52), rgba(255, 119, 76, 0.12));
}

.ambient-right {
  width: 220px;
  height: 220px;
  top: 15rem;
  right: -3rem;
  background: linear-gradient(135deg, rgba(85, 167, 161, 0.22), rgba(37, 80, 114, 0.08));
}

.hero,
.layout {
  position: relative;
  z-index: 1;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.5rem;
  align-items: end;
  margin-bottom: 1.5rem;
}

.eyebrow,
.section-kicker,
.panel-label {
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.73rem;
  font-weight: 700;
  color: var(--accent-strong);
}

h1,
h2 {
  margin: 0;
  font-family: "Fraunces", Georgia, serif;
  line-height: 0.95;
}

h1 {
  max-width: 10ch;
  font-size: clamp(3.2rem, 6vw, 5.8rem);
}

h2 {
  font-size: clamp(1.55rem, 2vw, 2rem);
}

.intro,
.section-note,
.supporting-copy,
.feedback,
.coach-card,
.stat-label,
.metric-label,
.field span,
.toggle span,
.choice-pill span,
.progress-text {
  color: var(--muted);
}

.intro {
  max-width: 58ch;
  margin: 1rem 0 0;
  font-size: 1.03rem;
  line-height: 1.6;
}

.card {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero-panel {
  padding: 1.4rem;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.metric,
.stat-block {
  padding: 1rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(247, 234, 215, 0.4));
  border: 1px solid rgba(76, 58, 37, 0.08);
  border-radius: 22px;
}

.metric-value,
.stat-value {
  display: block;
  margin-bottom: 0.3rem;
  font-size: clamp(1.55rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.5rem;
}

.full-span {
  grid-column: 1 / -1;
}

.control-panel,
.stats-card,
.arena,
.full-span,
.layout > .card {
  padding: 1.4rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
  margin-bottom: 1.2rem;
}

.section-heading.compact {
  margin-bottom: 1rem;
}

.section-note {
  margin: 0.45rem 0 0;
  max-width: 20ch;
  text-align: right;
  font-size: 0.95rem;
}

.settings-form {
  display: grid;
  gap: 1rem;
}

.field,
.toggle,
.choice-pill,
.answer-field {
  display: block;
}

.field span,
.toggle strong {
  display: block;
  margin-bottom: 0.5rem;
}

.field input,
.field select,
.answer-field input {
  width: 100%;
  border: 1px solid rgba(76, 58, 37, 0.14);
  border-radius: 18px;
  background: var(--surface-strong);
  color: var(--text);
  font: inherit;
  padding: 0.95rem 1rem;
  outline: none;
  transition:
    border-color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.field input:focus,
.field select:focus,
.answer-field input:focus {
  border-color: rgba(224, 107, 45, 0.6);
  box-shadow: 0 0 0 4px rgba(224, 107, 45, 0.12);
  transform: translateY(-1px);
}

.choice-row {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.choice-pill {
  flex: 1;
  min-width: 170px;
  padding: 0.35rem;
  border-radius: 22px;
  border: 1px solid rgba(76, 58, 37, 0.12);
  background: rgba(255, 251, 245, 0.56);
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.choice-pill input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.choice-pill span {
  display: block;
  padding: 0.8rem 1rem;
  border-radius: 18px;
}

.choice-pill:has(input:checked) {
  border-color: rgba(224, 107, 45, 0.48);
  background: rgba(224, 107, 45, 0.14);
  transform: translateY(-1px);
}

.toggle {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.8rem;
  align-items: start;
  padding: 1rem;
  border-radius: 22px;
  background: rgba(255, 250, 242, 0.68);
  border: 1px solid rgba(76, 58, 37, 0.08);
}

.toggle input {
  width: 1.1rem;
  height: 1.1rem;
  margin-top: 0.15rem;
  accent-color: var(--accent);
}

.button-row,
.answer-form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

button {
  appearance: none;
  border: none;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
  transition:
    transform 180ms ease,
    opacity 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.primary-button,
.ghost-button {
  padding: 0.95rem 1.2rem;
}

.primary-button {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #fff8f1;
  box-shadow: 0 18px 30px rgba(186, 67, 19, 0.2);
}

.ghost-button {
  background: rgba(255, 248, 241, 0.82);
  color: var(--text);
  border: 1px solid rgba(76, 58, 37, 0.12);
}

.arena {
  display: grid;
  gap: 1.2rem;
  align-content: start;
}

.arena-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.session-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 248, 241, 0.8);
  border: 1px solid rgba(76, 58, 37, 0.08);
  font-weight: 700;
}

.problem-wrap {
  position: relative;
  overflow: hidden;
  padding: 1.5rem;
  min-height: 250px;
  border-radius: 28px;
  background:
    radial-gradient(circle at top left, rgba(255, 205, 145, 0.7), transparent 32%),
    linear-gradient(150deg, rgba(255, 252, 246, 0.94) 0%, rgba(247, 230, 208, 0.72) 100%);
  border: 1px solid rgba(76, 58, 37, 0.08);
}

.problem-wrap::after {
  content: "";
  position: absolute;
  right: -2rem;
  bottom: -2rem;
  width: 140px;
  height: 140px;
  border-radius: 24px;
  rotate: 14deg;
  background: linear-gradient(135deg, rgba(28, 128, 108, 0.12), rgba(224, 107, 45, 0.12));
}

.problem-label {
  position: relative;
  z-index: 1;
  margin: 0 0 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.problem-text {
  position: relative;
  z-index: 1;
  margin: 0;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 1;
}

.supporting-copy {
  position: relative;
  z-index: 1;
  max-width: 34ch;
  margin: 0.9rem 0 0;
  line-height: 1.5;
}

.progress-cluster {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.progress-track {
  width: 170px;
  height: 12px;
  background: rgba(92, 65, 38, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #f2a73a 0%, #d65d23 100%);
  transition: width 260ms ease;
}

.answer-form {
  align-items: center;
}

.answer-field {
  flex: 1 1 220px;
}

.answer-field input {
  min-height: 60px;
  font-size: 1.15rem;
}

.feedback {
  min-height: 1.7rem;
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.5;
}

.feedback.success {
  color: var(--success);
}

.feedback.error {
  color: var(--danger);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.insight-list,
.recent-strip {
  display: grid;
  gap: 0.85rem;
}

.insight-item,
.recent-item,
.coach-card {
  padding: 1rem;
  border-radius: 22px;
  background: rgba(255, 251, 245, 0.72);
  border: 1px solid rgba(76, 58, 37, 0.08);
}

.insight-item {
  display: grid;
  gap: 0.8rem;
}

.insight-top,
.recent-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.fact-name,
.recent-equation {
  font-weight: 700;
}

.fact-meta,
.recent-meta {
  font-size: 0.92rem;
  color: var(--muted);
}

.bar-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(76, 58, 37, 0.08);
}

.bar-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(28, 128, 108, 0.72), rgba(224, 107, 45, 0.9));
}

.coach-card {
  line-height: 1.65;
}

.coach-card strong {
  color: var(--text);
}

.recent-strip {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.recent-item.correct {
  border-color: rgba(19, 121, 91, 0.18);
}

.recent-item.incorrect {
  border-color: rgba(164, 58, 24, 0.2);
}

.recent-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.recent-pill.correct {
  background: rgba(19, 121, 91, 0.12);
  color: var(--success);
}

.recent-pill.incorrect {
  background: rgba(164, 58, 24, 0.12);
  color: var(--danger);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.is-hidden {
  display: none;
}

.reveal {
  animation: rise-in 620ms ease both;
}

.reveal:nth-child(1) {
  animation-delay: 50ms;
}

.reveal:nth-child(2) {
  animation-delay: 120ms;
}

.reveal:nth-child(3) {
  animation-delay: 190ms;
}

.reveal:nth-child(4) {
  animation-delay: 260ms;
}

.reveal:nth-child(5) {
  animation-delay: 330ms;
}

.reveal:nth-child(6) {
  animation-delay: 400ms;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 960px) {
  .hero,
  .layout {
    grid-template-columns: 1fr;
  }

  .section-heading {
    flex-direction: column;
  }

  .section-note {
    text-align: left;
  }

  .problem-wrap {
    min-height: 220px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 1rem, 1180px);
    padding-top: 1.25rem;
  }

  h1 {
    max-width: 12ch;
  }

  .hero-metrics,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .arena-top,
  .progress-cluster,
  .answer-form {
    align-items: stretch;
  }

  .arena-top,
  .progress-cluster {
    flex-direction: column;
  }

  .progress-track {
    width: 100%;
  }
}