:root {
  --grass-dark: #0b3d2e;
  --grass: #0f6b41;
  --grass-light: #17904f;
  --turf: #1caf5f;
  --ball: #ff7a1a;
  --ball-dark: #d4610a;
  --card-yellow: #f4d03f;
  --card-red: #e74c3c;
  --card-green: #27ae60;
  --ink: #0d1b14;
  --paper: #f6f9f6;
  --paper-dim: #e7f0ea;
  --line: #cfe3d6;
  --white: #ffffff;
  --shadow: 0 10px 30px rgba(11, 61, 46, 0.15);
  --radius: 16px;
}

.speak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--line);
  background: var(--paper);
  cursor: pointer;
  font-size: 0.95rem;
  vertical-align: middle;
  margin-left: 8px;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.15s;
}
.speak-btn:hover { background: var(--paper-dim); transform: scale(1.08); }
.speak-btn.speaking { background: var(--ball); border-color: var(--ball-dark); }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; }

a { color: inherit; }

.container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 24px;
}

/* NAV */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(120deg, var(--grass-dark), var(--grass));
  box-shadow: var(--shadow);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: 1150px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.3px;
}

.brand .ball {
  width: 24px;
  height: 24px;
  background: radial-gradient(circle at 35% 30%, #ffb066, var(--ball) 60%, var(--ball-dark));
  border-radius: 50%;
  box-shadow: inset -3px -3px 6px rgba(0,0,0,0.3);
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: 10px 16px;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-weight: 600;
  border-radius: 999px;
  font-size: 0.95rem;
  transition: background 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.15);
  color: var(--white);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.6rem;
  cursor: pointer;
}

.nav-dropdown { position: relative; }

.nav-dropdown-toggle {
  background: none;
  border: none;
  color: rgba(255,255,255,0.85);
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  padding: 10px 16px;
  border-radius: 999px;
  transition: background 0.2s, color 0.2s;
}
.nav-dropdown-toggle:hover { background: rgba(255,255,255,0.15); color: var(--white); }

.nav-dropdown-menu {
  list-style: none;
  margin: 0;
  padding: 8px;
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--grass-dark);
  border-radius: 12px;
  box-shadow: var(--shadow);
  min-width: 220px;
  display: none;
  z-index: 50;
}
.nav-dropdown.open .nav-dropdown-menu { display: block; }

.nav-dropdown-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: background 0.15s, color 0.15s;
}
.nav-dropdown-menu a:hover,
.nav-dropdown-menu a.active {
  background: rgba(255,255,255,0.15);
  color: var(--white);
}

@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--grass-dark);
    padding: 10px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-dropdown-toggle { display: none; }
  .nav-dropdown-menu {
    display: block;
    position: static;
    background: none;
    box-shadow: none;
    padding: 0;
    min-width: 0;
  }
}

/* HERO */
.hero {
  position: relative;
  overflow: hidden;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.04) 0 40px, transparent 40px 80px),
    linear-gradient(160deg, var(--grass) 0%, var(--grass-dark) 100%);
  color: var(--white);
  padding: 72px 24px 96px;
  text-align: center;
}

.hero .tagline {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 18px;
  border-radius: 999px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(1.6rem, 6vw, 3.2rem);
  margin: 0 0 16px;
  font-weight: 800;
  overflow-wrap: break-word;
  hyphens: auto;
}

.hero p.lead {
  max-width: 640px;
  margin: 0 auto 28px;
  font-size: 1.15rem;
  color: rgba(255,255,255,0.9);
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--ball);
  color: var(--white);
  box-shadow: 0 8px 20px rgba(255, 122, 26, 0.35);
}
.btn-primary:hover { background: var(--ball-dark); }

.btn-ghost {
  background: rgba(255,255,255,0.08);
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
}
.btn-ghost:hover { background: rgba(255,255,255,0.18); }

.btn-outline {
  background: transparent;
  color: var(--grass);
  border-color: var(--grass);
}
.btn-outline:hover { background: var(--grass); color: var(--white); }

/* SECTIONS */
main { display: block; }

section { padding: 56px 0; }

.section-title {
  text-align: center;
  margin-bottom: 12px;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  color: var(--grass-dark);
}

.section-sub {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 40px;
  color: #4b6357;
}

/* CARD GRID */
.grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover { transform: translateY(-4px); box-shadow: 0 16px 34px rgba(11,61,46,0.22); }

.card .icon {
  font-size: 2.1rem;
}

.card h3 { margin: 0; color: var(--grass-dark); }

.card p { margin: 0; color: #52685c; font-size: 0.95rem; }

.pill {
  display: inline-block;
  background: var(--paper-dim);
  color: var(--grass-dark);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  width: fit-content;
}

/* RULES PAGE */
.rule-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 26px;
  box-shadow: var(--shadow);
}

.rule-block h3 {
  margin-top: 0;
  color: var(--grass-dark);
  display: flex;
  align-items: center;
  gap: 10px;
}

.rule-block .tag {
  font-size: 0.7rem;
  background: var(--turf);
  color: white;
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 700;
  vertical-align: middle;
}

.video-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  border-radius: 12px;
  overflow: hidden;
  margin-top: 16px;
  background: #000;
}

.video-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-credit {
  font-size: 0.8rem;
  color: #6f8579;
  margin-top: 8px;
}

.video-thumb {
  position: relative;
  display: block;
  margin-top: 16px;
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  background: #000;
  box-shadow: var(--shadow);
}

.video-thumb img {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: 0.85;
  transition: opacity 0.2s, transform 0.3s;
}

.video-thumb:hover img {
  opacity: 1;
  transform: scale(1.03);
}

.video-thumb .play-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(220, 40, 30, 0.9);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  padding-left: 4px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}

.video-thumb .video-thumb-title {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: #fff;
  font-weight: 700;
  font-size: 0.92rem;
}

/* 3D PAGES */
.stage {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

#field-canvas, #signal-canvas, #quiz-canvas {
  width: 100%;
  height: 520px;
  display: block;
  cursor: grab;
}
#field-canvas:active, #signal-canvas:active, #quiz-canvas:active { cursor: grabbing; }

.scenario-bar, .signal-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 18px;
  border-top: 1px solid var(--line);
  background: var(--paper-dim);
}

.scenario-btn, .signal-btn {
  border: 2px solid var(--grass);
  background: var(--white);
  color: var(--grass-dark);
  padding: 9px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.15s;
}

.scenario-btn:hover, .signal-btn:hover { background: var(--grass); color: white; }
.scenario-btn.active, .signal-btn.active { background: var(--ball); border-color: var(--ball-dark); color: white; }

.info-box {
  margin-top: 18px;
  padding: 18px 22px;
  background: var(--white);
  border-left: 5px solid var(--ball);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.info-box h4 { margin: 0 0 8px; color: var(--grass-dark); }
.info-box p { margin: 0; color: #40564a; }

.loading-note {
  text-align: center;
  padding: 14px;
  color: #6f8579;
  font-size: 0.85rem;
}

/* QUIZ */
.quiz-shell {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 32px;
  max-width: 720px;
  margin: 0 auto;
}

.quiz-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  font-weight: 700;
  color: var(--grass-dark);
}

.speed-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  margin: 18px auto 0;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--grass-dark);
  cursor: pointer;
  width: fit-content;
}
.speed-toggle input { width: 18px; height: 18px; accent-color: var(--ball); }

.timer-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--paper-dim);
  overflow: hidden;
  margin-bottom: 14px;
  display: none;
}
.timer-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--ball), var(--ball-dark));
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: var(--paper-dim);
  overflow: hidden;
  margin-bottom: 26px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--turf), var(--grass));
  width: 0%;
  transition: width 0.3s;
}

.question-text {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--ink);
}

.options { display: grid; gap: 12px; }

.option-btn {
  text-align: left;
  padding: 14px 18px;
  border-radius: 12px;
  border: 2px solid var(--line);
  background: var(--paper);
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.15s;
}

.option-btn:hover { border-color: var(--grass-light); }
.option-btn.correct { background: #e4f7ea; border-color: var(--card-green); }
.option-btn.wrong { background: #fdecea; border-color: var(--card-red); }
.option-btn:disabled { cursor: default; }

.explain-box {
  margin-top: 18px;
  padding: 14px 18px;
  border-radius: 10px;
  background: var(--paper-dim);
  display: none;
}
.explain-box.show { display: block; }

.quiz-actions {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.result-screen { text-align: center; }
.result-score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--grass-dark);
  margin: 10px 0;
}

/* SIGNALS PAGE LIST */
.signal-legend {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-top: 24px;
}
.signal-chip {
  display: flex;
  gap: 10px;
  align-items: center;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
}
.signal-chip .swatch {
  width: 18px; height: 18px; border-radius: 4px; flex-shrink: 0;
}

/* LEVEL SELECT */
.level-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  max-width: 900px;
  margin: 28px auto 0;
}

.level-card {
  position: relative;
  display: block;
  background: var(--white);
  border: 2px solid var(--line);
  border-top: 6px solid var(--level-color, var(--grass));
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
  font-family: inherit;
  text-decoration: none;
  color: inherit;
}
.level-card:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(11,61,46,0.22); }
.level-card.is-passed { border-color: #bfe6cc; }
.level-card h3 { margin: 0 0 8px; color: var(--ink); }
.level-card p { margin: 0; color: #52685c; font-size: 0.9rem; }
.level-card .level-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--level-color, var(--grass));
  margin-bottom: 8px;
}

.level-card .passed-ribbon {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 1.3rem;
  line-height: 1;
}

.level-status {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 0.82rem;
  font-weight: 700;
}
.level-status.status-passed { color: #1a8a4c; }
.level-status.status-attempted { color: #a1720f; }
.level-status.status-new { color: #94a3a0; font-weight: 600; }

.level-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  color: #fff;
  background: var(--level-color, var(--grass));
}

/* ACHIEVEMENTS */
.badge-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  max-width: 960px;
  margin: 0 auto;
}
.badge-card {
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.15s;
}
.badge-card.unlocked { border-color: var(--turf); }
.badge-card.locked { opacity: 0.5; filter: grayscale(0.6); }
.badge-card:hover { transform: translateY(-3px); }
.badge-icon { font-size: 2.4rem; margin-bottom: 8px; }
.badge-card h4 { margin: 0 0 6px; color: var(--grass-dark); font-size: 1.02rem; }
.badge-card p { margin: 0; color: #52685c; font-size: 0.85rem; }

.diploma-box {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}
.diploma-progress-track {
  height: 14px;
  border-radius: 999px;
  background: var(--paper-dim);
  overflow: hidden;
  margin: 18px 0;
}
.diploma-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--turf), var(--grass));
  transition: width 0.3s;
}
.name-input {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 0 auto 16px;
  padding: 11px 16px;
  border-radius: 999px;
  border: 2px solid var(--line);
  font-size: 1rem;
  text-align: center;
  background: var(--paper);
  color: var(--ink);
}

/* GLOSSARY */
.glossary-search {
  display: block;
  width: 100%;
  max-width: 480px;
  margin: 0 auto 8px;
  padding: 13px 20px;
  border-radius: 999px;
  border: 2px solid var(--line);
  font-size: 1rem;
  background: var(--white);
  color: var(--ink);
}
.glossary-count {
  text-align: center;
  color: #6f8579;
  font-size: 0.85rem;
  margin-bottom: 28px;
}
.glossary-list {
  display: grid;
  gap: 14px;
  max-width: 760px;
  margin: 0 auto;
}
.glossary-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 22px;
  box-shadow: var(--shadow);
}
.glossary-item strong { display: block; color: var(--grass-dark); font-size: 1.05rem; margin-bottom: 4px; }
.glossary-item p { margin: 0; color: #40564a; }

/* FOOTER */
.site-footer {
  background: var(--grass-dark);
  color: rgba(255,255,255,0.75);
  padding: 34px 24px;
  text-align: center;
  font-size: 0.9rem;
  margin-top: 40px;
}
.site-footer a { color: var(--turf); text-decoration: none; font-weight: 600; }

.page-hero {
  background: linear-gradient(160deg, var(--grass) 0%, var(--grass-dark) 100%);
  color: white;
  padding: 48px 24px;
  text-align: center;
}
.page-hero h1 { margin: 0 0 10px; font-size: clamp(1.5rem, 5vw, 2.6rem); overflow-wrap: break-word; }
.page-hero p { margin: 0; color: rgba(255,255,255,0.85); max-width: 640px; margin: 0 auto; }