@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,600;9..144,800&family=Space+Grotesk:wght@400;500;700&display=swap');

:root {
  color-scheme: light dark;
  --bg: #f2f8f3;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: rgba(255, 255, 255, 0.95);
  --text: #13221a;
  --muted: #4f6757;
  --accent: #0b8d6a;
  --accent-2: #d66f1f;
  --ok: #19733f;
  --warn: #b34f00;
  --danger: #b93825;
  --wash-1: rgba(11, 141, 106, 0.2);
  --wash-2: rgba(214, 111, 31, 0.16);
  --wash-3: rgba(45, 89, 73, 0.08);
  --track: #d8e7dc;
  --chip: #dfece3;
  --shadow: 0 16px 48px rgba(15, 34, 25, 0.11);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #091410;
    --surface: rgba(18, 30, 25, 0.86);
    --surface-strong: rgba(17, 29, 24, 0.95);
    --text: #edf7ef;
    --muted: #aac3b4;
    --accent: #40d4a8;
    --accent-2: #ffae63;
    --ok: #68d48c;
    --warn: #ffb977;
    --danger: #ff8c7b;
    --wash-1: rgba(64, 212, 168, 0.2);
    --wash-2: rgba(255, 174, 99, 0.18);
    --wash-3: rgba(89, 140, 115, 0.14);
    --track: #214138;
    --chip: #1d342d;
    --shadow: 0 18px 54px rgba(0, 0, 0, 0.45);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: radial-gradient(circle at 3% 3%, var(--wash-1) 0, transparent 40%),
    radial-gradient(circle at 95% 0%, var(--wash-2) 0, transparent 42%),
    radial-gradient(circle at 30% 100%, var(--wash-3) 0, transparent 52%),
    var(--bg);
  color: var(--text);
  font-family: 'Space Grotesk', 'Avenir Next', 'Segoe UI', sans-serif;
  line-height: 1.45;
  font-size: 16px;
}

a {
  color: var(--accent);
}

.app {
  width: min(960px, 100% - 1.1rem);
  margin: 0 auto;
  padding: 0.8rem 0 1.6rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  text-decoration: none;
  font-size: 0.94rem;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid color-mix(in oklab, var(--accent) 36%, transparent);
  margin-bottom: 0.7rem;
}

.hero,
.stats,
.mode-switch,
.panel,
.hub-card {
  animation: rise 320ms ease both;
}

.hero {
  background: linear-gradient(
      120deg,
      color-mix(in oklab, var(--accent) 22%, transparent),
      transparent 60%
    ),
    var(--surface);
  border: 1px solid color-mix(in oklab, var(--accent) 26%, transparent);
  border-radius: var(--radius-lg);
  padding: 1rem 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 0.83rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0.28rem 0 0.48rem;
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(1.4rem, 5vw, 2.4rem);
  line-height: 1.07;
}

.hero p {
  margin: 0;
}

.meta {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.meta span {
  background: var(--chip);
  color: var(--muted);
  border-radius: 999px;
  font-size: 0.84rem;
  padding: 0.28rem 0.7rem;
}

.stats {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid color-mix(in oklab, var(--accent) 20%, transparent);
  border-radius: var(--radius-md);
  padding: 0.62rem 0.7rem;
}

.stat-card .label {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-card .value {
  margin: 0.2rem 0 0;
  font-size: 1.08rem;
  font-weight: 700;
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.38rem;
}

.badge {
  display: inline-block;
  background: color-mix(in oklab, var(--accent-2) 25%, var(--surface-strong));
  color: var(--text);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-size: 0.77rem;
}

.stat-wide {
  grid-column: 1 / -1;
}

.mode-switch {
  margin-top: 0.82rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.44rem;
}

.mode-btn {
  appearance: none;
  border: 1px solid color-mix(in oklab, var(--accent) 32%, transparent);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  padding: 0.58rem 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.mode-btn.is-active {
  background: color-mix(in oklab, var(--accent) 30%, var(--surface));
  border-color: color-mix(in oklab, var(--accent) 55%, transparent);
}

.panel {
  display: none;
  margin-top: 0.8rem;
  background: var(--surface);
  border: 1px solid color-mix(in oklab, var(--accent) 20%, transparent);
  border-radius: var(--radius-lg);
  padding: 0.92rem;
  box-shadow: var(--shadow);
}

.panel.is-active {
  display: block;
}

.panel h2 {
  margin: 0;
  font-size: 1.2rem;
}

.panel-head {
  display: grid;
  gap: 0.3rem;
  margin-bottom: 0.65rem;
}

.progress-track {
  height: 9px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 240ms ease;
}

.progress-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.card {
  background: var(--surface-strong);
  border: 1px solid color-mix(in oklab, var(--accent) 16%, transparent);
  border-radius: var(--radius-md);
  padding: 0.82rem;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1.04rem;
}

.card p {
  margin: 0.2rem 0;
}

.card ul {
  margin: 0.45rem 0 0.65rem;
  padding-left: 1.1rem;
}

.card li {
  margin: 0.25rem 0;
}

.link-row {
  margin-top: 0.62rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.link-chip {
  text-decoration: none;
  font-size: 0.82rem;
  color: var(--text);
  background: var(--chip);
  border-radius: 999px;
  padding: 0.27rem 0.6rem;
}

.checkpoint {
  margin-top: 0.7rem;
  border-top: 1px solid color-mix(in oklab, var(--accent) 18%, transparent);
  padding-top: 0.72rem;
}

.checkpoint p {
  margin: 0;
}

.option-grid {
  margin-top: 0.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.48rem;
}

.option-btn {
  appearance: none;
  border: 1px solid color-mix(in oklab, var(--accent) 28%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in oklab, var(--surface) 78%, transparent);
  color: var(--text);
  padding: 0.64rem 0.68rem;
  text-align: left;
  font-size: 0.94rem;
  cursor: pointer;
}

.option-btn[disabled] {
  opacity: 0.8;
  cursor: default;
}

.option-btn.is-correct {
  border-color: color-mix(in oklab, var(--ok) 70%, transparent);
  background: color-mix(in oklab, var(--ok) 25%, var(--surface-strong));
}

.option-btn.is-wrong {
  border-color: color-mix(in oklab, var(--danger) 66%, transparent);
  background: color-mix(in oklab, var(--danger) 22%, var(--surface-strong));
}

.feedback {
  min-height: 1.42rem;
  margin-top: 0.5rem;
  font-size: 0.91rem;
  color: var(--muted);
}

.feedback.is-good {
  color: var(--ok);
}

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

.actions,
.quiz-controls,
.deliverable-controls {
  margin-top: 0.68rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn,
.btn-ghost {
  appearance: none;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.58rem 0.85rem;
  cursor: pointer;
}

.btn {
  background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 55%, var(--accent-2)));
  color: #fff;
  border: 1px solid color-mix(in oklab, var(--accent) 70%, transparent);
}

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid color-mix(in oklab, var(--accent) 32%, transparent);
}

.btn[disabled],
.btn-ghost[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

.confirm-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(9, 20, 15, 0.45);
  backdrop-filter: blur(2px);
}

.confirm-overlay.hidden {
  display: none;
}

.confirm-dialog {
  width: min(360px, 100%);
  background: var(--surface-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.1rem;
  border: 1px solid color-mix(in oklab, var(--accent) 32%, transparent);
}

.confirm-dialog h3 {
  margin: 0 0 0.4rem;
  font-family: 'Fraunces', Georgia, serif;
  font-size: 1.15rem;
}

.confirm-dialog p {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.result-grid {
  margin-top: 0.4rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
}

.result-pill {
  margin: 0;
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  background: var(--chip);
}

.result-pill strong {
  display: block;
  font-size: 1rem;
}

.deliverable-form {
  display: grid;
  gap: 0.65rem;
}

.field {
  display: grid;
  gap: 0.2rem;
}

.field label {
  font-size: 0.86rem;
  color: var(--muted);
}

input,
textarea {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid color-mix(in oklab, var(--accent) 30%, transparent);
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.58rem 0.62rem;
  font-family: inherit;
  font-size: 0.95rem;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.output-box {
  min-height: 250px;
  font-size: 0.88rem;
  line-height: 1.45;
}

.hub-note {
  margin-top: 0.75rem;
}

.hub-grid {
  margin-top: 0.85rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.62rem;
}

.hub-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid color-mix(in oklab, var(--accent) 24%, transparent);
  border-radius: var(--radius-md);
  padding: 0.88rem;
}

.hub-card h3 {
  margin: 0;
  font-size: 1rem;
}

.hub-card p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.hub-card .chip-row {
  margin-top: 0.42rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.hub-card .chip-row span {
  background: var(--chip);
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--muted);
  padding: 0.2rem 0.5rem;
}

@media (min-width: 760px) {
  .app {
    width: min(1020px, 100% - 2rem);
    padding-top: 1.25rem;
  }

  .hero,
  .panel {
    padding: 1.15rem 1.2rem;
  }

  .stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .stat-wide {
    grid-column: span 2;
  }

  .mode-btn {
    padding: 0.64rem 0.8rem;
    font-size: 0.92rem;
  }

  .option-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hub-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .hub-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(7px);
  }

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