:root {
  --bg: #0b0712;
  --bg-deep: #140a21;
  --bg-soft: rgba(36, 20, 59, 0.72);
  --bg-strong: rgba(47, 25, 74, 0.86);
  --surface-border: rgba(191, 161, 255, 0.12);
  --surface-shadow: 0 24px 60px rgba(7, 4, 16, 0.45);
  --ink: #f7f2ff;
  --ink-soft: #b9adca;
  --accent: #8f62ff;
  --accent-strong: #d2bbff;
  --success: #63d7ad;
  --danger: #ff8e98;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --font-ui: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  --font-display: "Instrument Serif", "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(143, 98, 255, 0.3), transparent 26rem),
    radial-gradient(circle at right 10%, rgba(214, 89, 190, 0.18), transparent 28rem),
    radial-gradient(circle at bottom center, rgba(62, 34, 102, 0.45), transparent 42rem),
    linear-gradient(180deg, #12091d 0%, var(--bg) 100%);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-ui);
  background-image:
    linear-gradient(rgba(247, 242, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(247, 242, 255, 0.03) 1px, transparent 1px);
  background-position: center;
  background-size: 3rem 3rem;
}

img {
  display: block;
  max-width: 100%;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1380px, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 2rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.95rem;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(189, 157, 255, 0.22), rgba(107, 58, 191, 0.18));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14);
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1;
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-name {
  letter-spacing: 0.16em;
  font-size: 0.85rem;
  font-weight: 700;
}

.brand-subtitle,
.subtle-label {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.progress-pill,
.mechanic-chip,
.chapter-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.4rem;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.home-screen,
.play-screen,
.home-stack {
  display: grid;
  gap: 1.25rem;
}

.home-screen,
.play-screen {
  align-content: start;
}

.home-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 1.25rem;
  align-items: start;
}

.card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(69, 36, 104, 0.92), rgba(24, 13, 39, 0.92)),
    linear-gradient(180deg, var(--bg-strong), var(--bg-soft));
  box-shadow: var(--surface-shadow);
  backdrop-filter: blur(16px);
  padding: 1.35rem;
  animation: rise-in 650ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.12), transparent 30%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 48%);
  pointer-events: none;
}

.hero-card {
  padding-bottom: 1.15rem;
  background:
    radial-gradient(circle at top left, rgba(181, 132, 255, 0.22), transparent 18rem),
    linear-gradient(180deg, rgba(55, 27, 89, 0.96), rgba(13, 8, 23, 0.98));
}

.home-about-card h2,
.play-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 0.98;
}

.home-about-card h2 {
  font-size: clamp(1.85rem, 3vw, 2.55rem);
}

.play-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.7rem;
  color: var(--accent-strong);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-card h1,
.puzzle-header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 0.95;
  font-weight: 400;
}

.puzzle-header h2 {
  font-size: clamp(1.85rem, 3.2vw, 2.7rem);
}

.hero-copy,
.prompt-block p,
.status-box,
.hint-box,
#chapterSummary {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.65;
}

.prompt-block p,
.hint-box {
  white-space: pre-line;
}

.hero-media {
  margin-top: 1.3rem;
  width: 100%;
  margin-inline: 0 auto 0 0;
  position: relative;
  border-radius: calc(var(--radius-xl) - 6px);
  overflow: hidden;
  aspect-ratio: 1566 / 779;
  background:
    linear-gradient(180deg, rgba(6, 4, 14, 0) 0%, rgba(6, 4, 14, 0.8) 100%),
    #10081b;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 18px 40px rgba(0, 0, 0, 0.38);
}

.hero-media-overlay {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 1rem 1.1rem;
  background: linear-gradient(180deg, rgba(8, 5, 15, 0) 0%, rgba(8, 5, 15, 0.88) 100%);
}

.hero-kicker {
  color: white;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.hero-caption {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  transform: none;
  filter: saturate(1.04) contrast(1.08) brightness(0.96);
}

.section-heading,
.puzzle-header,
.feedback-row,
.answer-row,
.hero-actions,
.play-stage-header,
.play-stage-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.hero-actions {
  margin-top: 1rem;
  flex-wrap: wrap;
}

.feature-grid,
.home-chapter-grid,
.puzzle-nav {
  display: grid;
  gap: 0.85rem;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
  min-height: 100%;
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.04);
}

.feature-card strong {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.98rem;
}

.feature-card p,
.play-copy {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.65;
}

.home-chapter-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.play-screen {
  gap: 1rem;
}

.play-stage-card {
  padding-bottom: 1rem;
}

.play-stage-header {
  align-items: flex-end;
}

.play-stage-actions {
  flex-wrap: wrap;
}

.play-copy {
  margin-top: 0.65rem;
  max-width: 68ch;
}

.chapter-stage-inner {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: calc(var(--radius-xl) - 8px);
  background:
    linear-gradient(180deg, rgba(44, 23, 72, 0.84), rgba(17, 11, 30, 0.84)),
    rgba(255, 255, 255, 0.02);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.play-workspace {
  width: min(980px, 100%);
  margin: 0 auto;
}

.chapter-item,
.puzzle-step {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.04);
}

.chapter-item {
  padding: 0;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.chapter-button,
.puzzle-step-button {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  text-decoration: none;
}

.chapter-button {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 1rem;
}

.chapter-item.is-active,
.puzzle-step.is-active {
  border-color: rgba(185, 145, 255, 0.34);
  background: rgba(255, 255, 255, 0.08);
}

.chapter-item:hover,
.puzzle-step:hover {
  transform: translateY(-2px);
}

.chapter-button strong {
  display: block;
  margin-bottom: 0.25rem;
}

.chapter-button span {
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.5;
}

.chapter-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.chapter-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
  color: #f4eaff;
  font-size: 0.88rem;
  font-weight: 600;
}

.inline-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
  color: #f0e5ff;
  font-weight: 500;
  text-decoration: none;
}

.inline-link:hover {
  text-decoration: underline;
}

.play-stage-actions .inline-link {
  margin-top: 0;
}

.chapter-summary-title {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
}

.chapter-summary-copy {
  margin: 0;
}

.puzzle-step-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
}

.puzzle-step-index {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.puzzle-step-title {
  display: block;
  margin-top: 0.24rem;
  font-weight: 500;
}

.puzzle-step-state {
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.puzzle-step.is-locked {
  opacity: 0.45;
}

.puzzle-step.is-locked .puzzle-step-button {
  cursor: not-allowed;
}

.puzzle-card {
  min-height: 0;
}

.puzzle-media {
  margin: 1rem 0 1.05rem;
}

.puzzle-image-frame {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: calc(var(--radius-xl) - 10px);
  background: rgba(255, 255, 255, 0.04);
}

.puzzle-image-frame img {
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  background: linear-gradient(180deg, rgba(19, 11, 31, 0.96), rgba(10, 7, 18, 0.98));
}

.clue-panel {
  margin-bottom: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: calc(var(--radius-xl) - 10px);
  background: rgba(255, 255, 255, 0.04);
  padding: 1rem;
}

.clue-grid {
  display: grid;
  gap: 0.8rem;
}

.mono-block,
.board-pre,
.matrix-card {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

.label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.74rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.mono-block {
  font-size: 1rem;
  letter-spacing: 0.12em;
  word-break: break-all;
}

.board-pre {
  margin: 0;
  overflow-x: auto;
  font-size: 0.97rem;
  line-height: 1.6;
}

.matrix-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.matrix-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.9rem;
  white-space: pre-wrap;
  line-height: 1.6;
}

.prompt-block {
  margin: 1rem 0 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.answer-form {
  margin-bottom: 0.95rem;
}

.answer-label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

#answerInput {
  flex: 1;
  min-width: 0;
  min-height: 3.3rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink);
  padding: 0 1.1rem;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

#answerInput::placeholder {
  color: rgba(247, 242, 255, 0.42);
}

#answerInput:focus {
  border-color: rgba(185, 145, 255, 0.5);
  box-shadow: 0 0 0 4px rgba(143, 98, 255, 0.12);
}

.primary-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.1rem;
  border-radius: 999px;
  padding: 0 1.15rem;
  text-decoration: none;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.primary-button {
  border: 0;
  background: linear-gradient(135deg, #9f6eff, #6738d6);
  color: white;
  cursor: pointer;
  box-shadow: 0 14px 30px rgba(94, 54, 180, 0.34);
}

.ghost-button {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  cursor: pointer;
}

.primary-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
}

.hint-box,
.status-box {
  margin-top: 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.95rem 1rem;
}

.status-box.is-success {
  border-color: rgba(31, 106, 79, 0.2);
  color: var(--success);
}

.status-box.is-error {
  border-color: rgba(156, 63, 51, 0.18);
  color: var(--danger);
}

.status-box.is-neutral {
  color: var(--ink-soft);
}

@media (max-width: 1100px) {
  .home-hero-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .play-stage-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-media {
    width: 100%;
    aspect-ratio: 1566 / 779;
  }
}

@media (max-width: 680px) {
  .page-shell {
    width: min(100vw - 1rem, 100%);
    padding-top: 0.75rem;
  }

  .topbar,
  .topbar-actions,
  .answer-row,
  .feedback-row,
  .puzzle-header,
  .hero-actions,
  .play-stage-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-card h1,
  .puzzle-header h2,
  .play-title {
    font-size: 2rem;
  }

  .card {
    padding: 1rem;
    border-radius: 24px;
  }

  .home-chapter-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}