@import url("https://fonts.googleapis.com/css2?family=Press+Start+2P&family=VT323:wght@400&display=swap");

:root {
  /* Vibrant Minecraft-inspired palette */
  --sky: #78c8ff;
  --sky-dark: #5aabf0;
  --cloud: #ffffff;
  --grass-top: #5dba48;
  --grass-side: #8b6914;
  --dirt: #7a5c12;
  --stone: #7f7f7f;
  --stone-dark: #4a4a4a;
  --stone-light: #a8a8a8;
  --wood: #a0744f;
  --wood-dark: #6b4a2e;
  --diamond: #3ee8ff;
  --gold: #ffd700;
  --gold-dark: #c9a600;
  --redstone: #ff3333;
  --emerald: #2bff7a;
  --lapis: #3366ff;
  --amethyst: #c44dff;
  --coral: #ff6b9d;
  --sunset: #ff9f43;
  --lime: #b8ff3c;
  --obsidian: #1a0f2e;
  --gui-bg: #fff5c0;
  --gui-border-light: #ffffff;
  --gui-border-dark: #555555;
  --gui-inner: #8b8b8b;
  --surface: #2d4a7a;
  --surface-light: #3d5f99;
  --text: #ffffff;
  --text-muted: #e8f4ff;
  --text-dark: #1a1a2e;
  --accent: #ffd700;
  --accent-gold: #ffe44d;
  --correct: #2bff7a;
  --wrong: #ff3333;
  --banner-height: 4.5rem;
  --radius: 0;
  --pixel-shadow: 4px 4px 0 #000000;
  --bevel-out: inset 2px 2px 0 var(--gui-border-light), inset -2px -2px 0 var(--gui-border-dark);
  --bevel-in: inset 2px 2px 0 var(--gui-border-dark), inset -2px -2px 0 var(--gui-border-light);
}

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

html {
  scroll-behavior: smooth;
  image-rendering: pixelated;
}

body {
  font-family: "VT323", "Courier New", monospace;
  font-size: 1.25rem;
  background: var(--obsidian);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Animated pixel sky + grass strip ─── */
.tropical-bg {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  background-color: var(--sky);
  overflow: hidden;
}

.tropical-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--sky);
  animation: sky-pulse 8s steps(4) infinite;
}

.tropical-bg::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background-color: var(--grass-top);
  border-top: 4px solid #4a9040;
  box-shadow:
    0 4px 0 var(--grass-side),
    0 8px 0 var(--dirt),
    0 12px 0 #6b5010;
}

@keyframes sky-pulse {
  0%, 100% { background-color: var(--sky); }
  50% { background-color: var(--sky-dark); }
}

/* Pixel clouds */
.palm-deco {
  pointer-events: none;
  position: fixed;
  z-index: 0;
  width: 80px;
  height: 32px;
  background-color: var(--cloud);
  box-shadow:
    -24px 8px 0 var(--cloud),
    24px 8px 0 var(--cloud),
    -12px -8px 0 var(--cloud),
    12px -8px 0 var(--cloud),
    0 -16px 0 var(--cloud);
  animation: cloud-drift 24s linear infinite;
  font-size: 0;
  opacity: 0.9;
}

.palm-deco--left {
  top: 12%;
  left: -120px;
  animation-duration: 28s;
}

.palm-deco--right {
  top: 22%;
  left: -200px;
  animation-duration: 20s;
  animation-delay: -8s;
  transform: scale(0.75);
}

@keyframes cloud-drift {
  from { transform: translateX(0); }
  to { transform: translateX(calc(100vw + 240px)); }
}

.screen {
  display: none;
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

.screen.active {
  display: flex;
  flex-direction: column;
}

/* ─── HOME ─── */
#screen-home {
  align-items: stretch;
}

.home-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--banner-height);
  background:
    url("gettyimages-141810255-2048x2048.jpg") center 30% / cover no-repeat;
}

.home-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: rgba(26, 15, 46, 0.55);
  z-index: 0;
}

.home-top,
.home-content {
  position: relative;
  z-index: 1;
}

.home-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--banner-height);
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #3366ff;
  border-bottom: 4px solid #1a3d99;
  box-shadow: 0 4px 0 #000000, 0 8px 0 var(--gold);
}

.brand {
  font-family: "Press Start 2P", monospace;
  font-size: clamp(0.6rem, 2.8vw, 0.85rem);
  color: var(--gold);
  text-shadow:
    2px 2px 0 #ff3333,
    4px 4px 0 #000000;
  line-height: 1.6;
  animation: title-glow 3s steps(2) infinite;
}

@keyframes title-glow {
  0%, 100% { color: var(--gold); }
  33% { color: var(--lime); }
  66% { color: var(--coral); }
}

.chapter-pill {
  font-family: "Press Start 2P", monospace;
  font-size: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: var(--coral);
  border: 3px solid;
  border-color: #ffb3cc #cc4477 #cc4477 #ffb3cc;
  padding: 0.5rem 0.75rem;
  color: #ffffff;
  box-shadow: 2px 2px 0 #000000;
}

.home-content {
  padding: 2rem 1.5rem 5rem;
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
}

.home-content h1 {
  font-family: "Press Start 2P", monospace;
  font-size: clamp(0.85rem, 4vw, 1.25rem);
  line-height: 1.8;
  color: var(--diamond);
  margin-bottom: 1.25rem;
  text-shadow:
    2px 0 0 #000000,
    0 2px 0 #000000,
    2px 2px 0 #000000,
    4px 4px 0 var(--stone-dark);
  animation: block-bob 2s steps(2) infinite;
}

@keyframes block-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.home-content .tagline {
  font-size: 1.35rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.5;
  text-shadow: 2px 2px 0 #000000;
}

.story-box {
  background-color: #5a2d8a;
  border: 4px solid;
  border-color: var(--amethyst) #6b1faa #6b1faa var(--amethyst);
  padding: 1.25rem 1.5rem;
  text-align: left;
  margin-bottom: 1.75rem;
  box-shadow: var(--pixel-shadow);
  position: relative;
  overflow: hidden;
}

.story-box::before {
  content: "⛏";
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 1.5rem;
  opacity: 0.7;
  animation: pickaxe-swing 1.5s steps(3) infinite;
}

@keyframes pickaxe-swing {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-20deg); }
}

.story-box p {
  font-size: 1.2rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.story-box strong {
  color: var(--gold);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: "Press Start 2P", monospace;
  font-size: 0.65rem;
  padding: 1rem 1.75rem;
  border: 4px solid;
  border-color: var(--gui-border-light) var(--gui-border-dark) var(--gui-border-dark) var(--gui-border-light);
  cursor: pointer;
  text-transform: uppercase;
  transition: none;
  image-rendering: pixelated;
}

.btn:active {
  border-color: var(--gui-border-dark) var(--gui-border-light) var(--gui-border-light) var(--gui-border-dark);
  box-shadow: var(--bevel-in);
  transform: translate(2px, 2px);
}

.btn-primary {
  background-color: var(--gui-bg);
  color: var(--text-dark);
  box-shadow: var(--pixel-shadow);
  animation: btn-idle 2s steps(2) infinite;
}

@keyframes btn-idle {
  0%, 100% { box-shadow: var(--pixel-shadow); }
  50% { box-shadow: 6px 6px 0 #000000; }
}

.btn-primary:hover {
  background-color: #d8d8d8;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 #000000;
}

.audio-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 200;
  width: 3rem;
  height: 3rem;
  border: 4px solid;
  border-color: var(--lime) #559900 #559900 var(--lime);
  background-color: var(--coral);
  color: #ffffff;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--pixel-shadow);
  font-family: "Press Start 2P", monospace;
}

.audio-toggle:hover {
  background-color: var(--gold);
  color: var(--text-dark);
}

body:has(#screen-home.active) .audio-toggle {
  top: calc(var(--banner-height) + 0.75rem);
}

.audio-toggle.muted {
  opacity: 0.55;
  background-color: var(--stone);
  color: var(--text);
}

.fail-banner {
  display: none;
  background-color: #4a1515;
  border: 4px solid var(--wrong);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  text-align: left;
  box-shadow: var(--pixel-shadow);
  animation: shake 0.5s steps(4);
}

.fail-banner.visible {
  display: block;
}

.fail-banner h3 {
  font-family: "Press Start 2P", monospace;
  font-size: 0.65rem;
  color: #ff6b6b;
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.fail-banner p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  50% { transform: translateX(8px); }
  75% { transform: translateX(-4px); }
}

/* ─── MINECRAFT WORLD (chapter backgrounds) ─── */
#screen-ch1,
#screen-ch2,
#screen-ch3,
#screen-ch4 {
  background-color: #78c8ff;
  overflow: hidden;
}

.mc-world {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  background-color: #78c8ff;
  animation: mc-sky-shift 12s steps(6) infinite;
}

@keyframes mc-sky-shift {
  0%, 100% { background-color: #78c8ff; }
  50% { background-color: #8ad4ff; }
}

.mc-sun {
  position: absolute;
  top: 3.5rem;
  right: 12%;
  width: 56px;
  height: 56px;
  background-color: #f8e038;
  box-shadow:
    8px 0 0 #f0d030,
    0 8px 0 #f0d030,
    8px 8px 0 #e8c820;
  animation: mc-sun-pulse 4s steps(2) infinite;
}

@keyframes mc-sun-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.mc-cloud {
  position: absolute;
  width: 48px;
  height: 16px;
  background-color: #ffffff;
  box-shadow:
    -16px 8px 0 #ffffff,
    16px 8px 0 #ffffff,
    -8px -8px 0 #ffffff,
    8px -8px 0 #ffffff,
    0 -16px 0 #ffffff;
  opacity: 0.95;
}

.mc-cloud--1 {
  top: 14%;
  left: -160px;
  animation: mc-cloud-drift 32s linear infinite;
}

.mc-cloud--2 {
  top: 22%;
  left: -240px;
  animation: mc-cloud-drift-2 24s linear infinite;
  animation-delay: -10s;
}

.mc-cloud--3 {
  top: 8%;
  left: -120px;
  animation: mc-cloud-drift-3 40s linear infinite;
  animation-delay: -20s;
}

@keyframes mc-cloud-drift {
  from { transform: translateX(0); }
  to { transform: translateX(calc(100vw + 320px)); }
}

@keyframes mc-cloud-drift-2 {
  from { transform: translateX(0) scale(0.8); }
  to { transform: translateX(calc(100vw + 320px)) scale(0.8); }
}

@keyframes mc-cloud-drift-3 {
  from { transform: translateX(0) scale(1.15); }
  to { transform: translateX(calc(100vw + 320px)) scale(1.15); }
}

.mc-ground {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 140px;
}

.mc-ground::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 48px;
  background-color: #8b6914;
  border-top: 4px solid #6b5010;
  box-shadow:
    0 -48px 0 0 #5dba48,
    0 -52px 0 0 #4a9040,
    0 -56px 0 0 #3d7a35;
}

.mc-ground::after {
  content: "";
  position: absolute;
  bottom: 48px;
  left: 0;
  right: 0;
  height: 8px;
  background-color: transparent;
  box-shadow:
    16px 0 0 8px #5dba48,
    64px 0 0 8px #4a9040,
    128px 0 0 8px #5dba48,
    200px 0 0 8px #4a9040,
    280px 0 0 8px #5dba48,
    360px 0 0 8px #4a9040,
    440px 0 0 8px #5dba48,
    520px 0 0 8px #4a9040,
    600px 0 0 8px #5dba48,
    680px 0 0 8px #4a9040,
    760px 0 0 8px #5dba48;
}

.mc-tree {
  position: absolute;
  bottom: 48px;
  width: 12px;
  height: 40px;
  background-color: #6b4a2e;
  box-shadow: 2px 0 0 #5a3d26;
}

.mc-tree::before {
  content: "";
  position: absolute;
  bottom: 28px;
  left: -18px;
  width: 48px;
  height: 48px;
  background-color: transparent;
  box-shadow:
    0 0 0 12px #3d8b37,
    12px 0 0 12px #4a9a44,
    24px 0 0 12px #3d8b37,
    0 -12px 0 12px #5cb850,
    12px -12px 0 12px #4a9a44,
    24px -12px 0 12px #3d8b37,
    0 -24px 0 12px #4a9a44,
    12px -24px 0 12px #5cb850,
    24px -24px 0 12px #4a9a44;
}

.mc-tree:nth-child(1) { left: 6%; }
.mc-tree:nth-child(2) { left: 20%; bottom: 48px; transform: scale(0.85); }
.mc-tree:nth-child(3) { left: 68%; }
.mc-tree:nth-child(4) { left: 84%; transform: scale(0.9); }
.mc-tree:nth-child(5) { left: 42%; }

.mc-tree--tall {
  height: 52px;
  bottom: 48px;
}

.mc-tree--tall::before {
  bottom: 36px;
  box-shadow:
    0 0 0 12px #3d8b37,
    12px 0 0 12px #4a9a44,
    24px 0 0 12px #3d8b37,
    0 -12px 0 12px #5cb850,
    12px -12px 0 12px #4a9a44,
    24px -12px 0 12px #3d8b37,
    0 -24px 0 12px #4a9a44,
    12px -24px 0 12px #5cb850,
    24px -24px 0 12px #4a9a44,
    0 -36px 0 12px #3d8b37,
    12px -36px 0 12px #4a9a44,
    24px -36px 0 12px #3d8b37;
}

.mc-tree--wide::before {
  left: -24px;
  width: 60px;
  box-shadow:
    0 0 0 12px #3d8b37,
    12px 0 0 12px #4a9a44,
    24px 0 0 12px #3d8b37,
    36px 0 0 12px #4a9a44,
    0 -12px 0 12px #5cb850,
    12px -12px 0 12px #4a9a44,
    24px -12px 0 12px #3d8b37,
    36px -12px 0 12px #5cb850,
    0 -24px 0 12px #4a9a44,
    12px -24px 0 12px #5cb850,
    24px -24px 0 12px #4a9a44,
    36px -24px 0 12px #3d8b37;
}

/* ─── CHAPTERS ─── */
.chapter-wrap {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 920px;
  margin: 0 auto;
  width: 100%;
  padding: 1.5rem 1.25rem 10rem;
}

body:has(#screen-ch1.active) .tropical-bg,
body:has(#screen-ch2.active) .tropical-bg,
body:has(#screen-ch3.active) .tropical-bg,
body:has(#screen-ch4.active) .tropical-bg,
body:has(#screen-ch1.active) .palm-deco,
body:has(#screen-ch2.active) .palm-deco,
body:has(#screen-ch3.active) .palm-deco,
body:has(#screen-ch4.active) .palm-deco {
  visibility: hidden;
}

.chapter-header {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background-color: rgba(198, 198, 198, 0.94);
  border: 4px solid #000000;
  box-shadow:
    inset 3px 3px 0 #ffffff,
    inset -3px -3px 0 #555555,
    4px 4px 0 rgba(0, 0, 0, 0.45);
}

.chapter-label {
  font-family: "Press Start 2P", monospace;
  font-size: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #555555;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.chapter-title {
  font-family: "Press Start 2P", monospace;
  font-size: clamp(0.75rem, 3.8vw, 1.1rem);
  color: #1a1a1a;
  line-height: 1.7;
  text-shadow: 1px 1px 0 #ffffff;
}

.progress-steps {
  display: flex;
  gap: 6px;
  margin-top: 1rem;
}

.step-dot {
  flex: 1;
  height: 12px;
  background-color: var(--stone-dark);
  border: 2px solid #000000;
  transition: background-color 0.2s steps(1);
}

.step-dot.done {
  background-color: var(--emerald);
  box-shadow: inset 0 0 0 2px #0d9e42;
}

.step-dot.current {
  background-color: var(--gold);
  animation: step-blink 1s steps(2) infinite;
}

@keyframes step-blink {
  0%, 100% { background-color: var(--gold); }
  50% { background-color: var(--gold-dark); }
}

.narrative {
  background-color: rgba(198, 198, 198, 0.92);
  border: 4px solid #000000;
  padding: 1.35rem 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 1.45rem;
  line-height: 1.55;
  color: #1a1a1a;
  box-shadow:
    inset 3px 3px 0 #ffffff,
    inset -3px -3px 0 #555555,
    4px 4px 0 rgba(0, 0, 0, 0.4);
}

.narrative em {
  color: #3366cc;
  font-style: normal;
  font-weight: 700;
}

.scenario-visual {
  margin-bottom: 1.25rem;
  overflow: hidden;
  border: 4px solid #000000;
  box-shadow: var(--pixel-shadow);
  background-color: var(--stone-dark);
}

.scenario-visual img {
  display: block;
  width: 100%;
  height: clamp(320px, 52vw, 520px);
  object-fit: contain;
  object-position: center;
  image-rendering: pixelated;
}

.scenario-caption {
  padding: 0.5rem 0.75rem;
  font-family: "Press Start 2P", monospace;
  font-size: 0.45rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text);
  background-color: var(--stone-dark);
  text-align: center;
  line-height: 1.6;
  border-top: 4px solid #000000;
}

/* Minecraft inventory-style question panel */
.problem-card {
  --inv-slot: #8b8b8b;
  --inv-slot-dark: #373737;
  --inv-slot-light: #dbdbdb;
  background-color: #c6c6c6;
  border: 4px solid #000000;
  padding: 0.5rem;
  box-shadow:
    inset 4px 4px 0 #ffffff,
    inset -4px -4px 0 #555555,
    6px 6px 0 rgba(0, 0, 0, 0.5);
  color: #2d2d2d;
  position: relative;
}

.problem-card::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 2px solid #555555;
  pointer-events: none;
  z-index: 0;
}

.problem-card > * {
  position: relative;
  z-index: 1;
}

.problem-type {
  font-family: "Press Start 2P", monospace;
  font-size: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #404040;
  margin-bottom: 0.85rem;
  padding: 0.5rem 0.65rem;
  line-height: 1.6;
  background-color: #a0a0a0;
  border: 2px solid;
  border-color: var(--inv-slot-light) var(--inv-slot-dark) var(--inv-slot-dark) var(--inv-slot-light);
  box-shadow: inset 1px 1px 0 rgba(255, 255, 255, 0.5);
}

.problem-text {
  font-size: 1.5rem;
  line-height: 1.55;
  margin-bottom: 1rem;
  color: #1a1a1a;
  padding: 0 0.35rem;
}

.math-block {
  background-color: var(--inv-slot);
  padding: 1rem 1.15rem;
  font-family: "VT323", "Courier New", monospace;
  font-size: 1.55rem;
  margin: 1rem 0;
  line-height: 1.6;
  color: #ffffff;
  border: 2px solid;
  border-color: var(--inv-slot-dark) #000000 #000000 var(--inv-slot-dark);
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, 0.45);
}

.math-block .part-label {
  font-family: "Press Start 2P", monospace;
  font-size: 0.45rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #e0e0e0;
  display: block;
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

.options {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 1.25rem;
  padding: 6px;
  background-color: #a0a0a0;
  border: 2px solid;
  border-color: var(--inv-slot-dark) #000000 #000000 var(--inv-slot-dark);
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, 0.35);
}

.option-btn {
  width: 100%;
  text-align: left;
  padding: 0.85rem 1rem;
  min-height: 52px;
  background-color: var(--inv-slot);
  border: 2px solid;
  border-color: var(--inv-slot-light) var(--inv-slot-dark) var(--inv-slot-dark) var(--inv-slot-light);
  color: #ffffff;
  font-family: "VT323", monospace;
  font-size: 1.45rem;
  line-height: 1.4;
  cursor: pointer;
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, 0.35);
  text-shadow: 1px 1px 0 #000000;
}

.option-btn:hover:not(:disabled) {
  background-color: #9a9aa2;
  border-color: #ffffff #555555 #555555 #ffffff;
  box-shadow: inset 1px 1px 0 rgba(255, 255, 255, 0.25), inset -1px -1px 0 rgba(0, 0, 0, 0.4);
}

.option-btn:active:not(:disabled) {
  border-color: var(--inv-slot-dark) var(--inv-slot-light) var(--inv-slot-light) var(--inv-slot-dark);
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, 0.5);
  transform: translate(1px, 1px);
}

.option-btn:disabled {
  opacity: 0.7;
  cursor: default;
}

.option-btn .letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background-color: #555555;
  border: 2px solid;
  border-color: #888888 #222222 #222222 #888888;
  font-family: "Press Start 2P", monospace;
  font-size: 0.45rem;
  margin-right: 0.75rem;
  color: #ffffff;
  vertical-align: middle;
  box-shadow: inset 1px 1px 0 rgba(0, 0, 0, 0.4);
}

.feedback {
  margin-top: 1.25rem;
  padding: 1.1rem 1.25rem;
  font-family: "VT323", monospace;
  font-size: 1.35rem;
  font-weight: 700;
  display: none;
  border: 4px solid #000000;
  box-shadow: var(--pixel-shadow);
}

.feedback.show {
  display: block;
}

.feedback.wrong {
  background-color: #4a1515;
  border-color: var(--wrong);
  color: #ff8a8a;
}

.feedback.right {
  background-color: #0d3d22;
  border-color: var(--correct);
  color: #7dffb0;
}

/* Success reward overlay — inventory popup */
.success-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background-color: rgba(0, 0, 0, 0.55);
  animation: fadeIn 0.35s steps(4);
}

.success-overlay.visible {
  display: flex;
}

.success-card {
  max-width: 380px;
  width: 100%;
  text-align: center;
  background-color: #c6c6c6;
  border: 4px solid #000000;
  padding: 0.5rem;
  box-shadow:
    inset 4px 4px 0 #ffffff,
    inset -4px -4px 0 #555555,
    8px 8px 0 rgba(0, 0, 0, 0.6);
  animation: card-pop 0.4s steps(4);
}

.success-card {
  position: relative;
}

.success-card::before {
  content: "";
  display: block;
  position: absolute;
  inset: 4px;
  border: 2px solid #555555;
  pointer-events: none;
  z-index: 0;
}

@keyframes card-pop {
  from { transform: scale(0.85); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.success-card h3 {
  font-family: "Press Start 2P", monospace;
  font-size: 0.65rem;
  color: #2d2d2d;
  margin-bottom: 0.75rem;
  padding: 0.5rem;
  line-height: 1.6;
  background-color: #a0a0a0;
  border: 2px solid;
  border-color: #dbdbdb #373737 #373737 #dbdbdb;
  position: relative;
  z-index: 1;
}

.success-card img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border: 2px solid;
  border-color: #373737 #dbdbdb #dbdbdb #373737;
  background-color: #8b8b8b;
  image-rendering: pixelated;
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, 0.4);
  position: relative;
  z-index: 1;
}

.success-card p {
  margin-top: 0.75rem;
  font-size: 1.2rem;
  color: #1a1a1a;
  padding: 0.5rem;
  position: relative;
  z-index: 1;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ─── VICTORY ─── */
#screen-victory {
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem 1.5rem;
}

.victory-card {
  max-width: 520px;
  background-color: var(--surface);
  border: 4px solid;
  border-color: var(--gold) #8a7000 #8a7000 var(--gold);
  padding: 2.5rem 2rem;
  box-shadow: 8px 8px 0 #000000;
  animation: victory-rise 0.6s steps(6);
}

@keyframes victory-rise {
  from { transform: translateY(32px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.victory-card h2 {
  font-family: "Press Start 2P", monospace;
  font-size: clamp(0.7rem, 3.5vw, 1rem);
  color: var(--gold);
  margin-bottom: 1rem;
  line-height: 1.7;
  text-shadow: 2px 2px 0 #000000;
  animation: title-glow 2s steps(2) infinite;
}

.victory-card p {
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
}

.victory-reward {
  margin-bottom: 1.25rem;
  overflow: hidden;
  border: 4px solid var(--diamond);
  box-shadow: var(--pixel-shadow);
  animation: block-bob 3s steps(2) infinite;
}

.victory-reward img {
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  background-color: transparent;
  image-rendering: pixelated;
}

.wave-deco {
  font-family: "Press Start 2P", monospace;
  font-size: 0.55rem;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  color: var(--emerald);
  animation: xp-orbs 1.5s steps(3) infinite;
}

@keyframes xp-orbs {
  0%, 100% { color: var(--emerald); transform: translateY(0); }
  33% { color: var(--diamond); transform: translateY(-4px); }
  66% { color: var(--gold); transform: translateY(-8px); }
}

@media (max-width: 480px) {
  :root {
    --banner-height: 4rem;
  }

  .home-hero {
    background-position: center 25%;
  }

  .home-content {
    padding-bottom: 3rem;
  }

  .chapter-wrap {
    padding-bottom: 8rem;
  }

  .mc-sun {
    width: 40px;
    height: 40px;
    box-shadow:
      6px 0 0 #f0d030,
      0 6px 0 #f0d030,
      6px 6px 0 #e8c820;
  }

  .mc-ground {
    height: 100px;
  }

  .mc-tree::before {
    left: -14px;
    width: 40px;
  }

  .problem-card {
    padding: 0.4rem;
  }

  .problem-text {
    font-size: 1.3rem;
  }

  .option-btn {
    font-size: 1.25rem;
    padding: 1.1rem 1.15rem;
  }

  .scenario-visual img {
    height: clamp(280px, 80vw, 420px);
  }

  .brand {
    font-size: 0.5rem;
  }

  .chapter-pill {
    font-size: 0.38rem;
    padding: 0.4rem 0.5rem;
  }

  body:has(#screen-home.active) .audio-toggle {
    top: calc(var(--banner-height) + 0.5rem);
  }
}