:root {
  --cc-dark: #4c3a34;
  --cc-medium: #7b5a3d;
  --cc-gold: #e2b547;
  --cc-amber: #f5d37a;
  --cc-ivory: #fff9ef;
  --cc-white: #ffffff;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: "Merriweather Sans", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, rgba(226,181,71,0.25), transparent 55%), var(--cc-ivory);
  color: var(--cc-dark);
}

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

#wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 24px 0;
  background: var(--cc-white);
  border-bottom: 1px solid rgba(76,58,52,0.08);
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo-lockup {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: clamp(16px, 4vw, 48px);
  padding: clamp(18px, 4vw, 48px) clamp(24px, 6vw, 72px);
  width: 100%;
  border-radius: clamp(28px, 6vw, 72px);
  background:
    radial-gradient(circle at 75% 50%, rgba(245,211,122,0.35), transparent 60%),
    linear-gradient(100deg, var(--cc-white) 0%, var(--cc-white) 55%, rgba(226,181,71,0.18) 70%, rgba(123,90,61,0.15) 100%);
  box-shadow: 0 18px 32px rgba(76,58,52,0.08);
  border: 1px solid rgba(76,58,52,0.08);
}

.logo-lockup img {
  width: clamp(120px, 12vw, 180px);
  filter: none;
}

.hero-copy {
  flex: 1;
  display: flex;
  justify-content: center;
  text-align: center;
}

.hero-copy h1 {
  margin: 0 0 6px;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.1;
  color: var(--cc-dark);
}

.hero-copy p {
  margin: 0;
  font-size: clamp(13px, 2vw, 16px);
  color: rgba(76,58,52,0.75);
}

.main-shell {
  flex: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  padding: 0 clamp(20px, 5vw, 60px) 48px;
}

nav.level-nav {
  position: relative;
  background: #ffffff;
  border-radius: 12px;
  padding: 24px 20px;
  border: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

nav.level-nav::before,
nav.level-nav::after {
  display: none;
}

.level-nav-head {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.level-nav-head .eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
  color: var(--cc-gold);
  font-weight: 600;
}

.level-nav-head h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  color: var(--cc-dark);
  font-weight: 700;
  line-height: 1.2;
}

.level-nav-head p:last-child {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.4;
  color: rgba(76,58,52,0.7);
  font-weight: 400;
}

.level-link-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.level-link {
  width: 100%;
  border: 1px solid rgba(76,58,52,0.15);
  background: #ffffff;
  color: var(--cc-dark);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 14px 16px;
  border-radius: 8px;
  text-align: left;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(76,58,52,0.08);
}

.level-link:hover {
  background: rgba(226,181,71,0.05);
  border-color: var(--cc-gold);
  box-shadow: 0 2px 8px rgba(76,58,52,0.12);
}

.level-link.is-active {
  background: var(--cc-dark);
  color: #ffffff;
  border-color: var(--cc-dark);
  box-shadow: 0 4px 12px rgba(76,58,52,0.25);
}

.level-link::before,
.level-link::after {
  display: none;
}

.level-seq {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--cc-dark);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(226,181,71,0.1);
  border: 1px solid var(--cc-gold);
  border-radius: 6px;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.level-link:hover .level-seq {
  background: rgba(226,181,71,0.2);
  border-color: var(--cc-amber);
}

.level-link.is-active .level-seq {
  background: rgba(255,255,255,0.2);
  color: #ffffff;
  border-color: rgba(255,255,255,0.3);
}

.level-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.level-name {
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.2;
}

.level-desc {
  font-size: 0.75rem;
  color: rgba(76,58,52,0.7);
  font-weight: 400;
  line-height: 1.2;
  margin-top: 2px;
}

.level-link.is-active .level-name {
  color: #ffffff;
}

.level-link.is-active .level-desc {
  color: rgba(255,255,255,0.8);
}

.level-arrow {
  margin-left: auto;
  font-size: 0.9rem;
  color: var(--cc-gold);
  font-weight: 400;
  transition: all 0.2s ease;
}

.level-link:hover .level-arrow {
  color: var(--cc-amber);
}

.level-link.is-active .level-arrow {
  color: #ffffff;
}

.level-content {
  background: var(--cc-white);
  border-radius: 32px;
  padding: 40px clamp(24px, 5vw, 64px);
  border: 2px solid rgba(76,58,52,0.12);
  box-shadow: 0 35px 65px rgba(76,58,52,0.12);
}

.cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.cta-btn {
  appearance: none;
  border: none;
  border-radius: 32px;
  padding: 28px 32px;
  text-align: left;
  cursor: pointer;
  background: linear-gradient(135deg, rgba(245,211,122,0.35), rgba(226,181,71,0.25));
  border: 2px solid rgba(76,58,52,0.15);
  box-shadow: 0 20px 40px rgba(76,58,52,0.12);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.cta-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s ease;
}

.cta-btn:hover::before {
  left: 100%;
}

.cta-btn:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 30px 60px rgba(76,58,52,0.25);
  background: linear-gradient(135deg, rgba(245,211,122,0.45), rgba(226,181,71,0.35));
  border-color: var(--cc-gold);
}

.cta-btn:active {
  transform: translateY(-2px) scale(1.01);
  transition: all 0.1s ease;
}

.cta-title {
  display: block;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--cc-dark);
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}

.cta-note {
  display: block;
  margin-top: 8px;
  color: var(--cc-medium);
  font-size: 1rem;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

.level-details {
  margin-top: 40px;
  padding: 32px;
  border-radius: 32px;
  border: 2px solid rgba(76,58,52,0.12);
  background: linear-gradient(135deg, rgba(255,249,239,0.9), rgba(245,211,122,0.15));
  box-shadow: 0 15px 35px rgba(76,58,52,0.08), inset 0 0 0 1px rgba(226,181,71,0.3);
  position: relative;
  overflow: hidden;
}

.level-details::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(226,181,71,0.1) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-10px, -10px) rotate(180deg); }
}

.level-details h4 {
  margin: 0 0 20px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--cc-dark);
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}

.level-details h4::before {
  content: "💡";
  font-size: 1.2rem;
}

.level-details ul {
  margin: 0;
  padding-left: 0;
  display: grid;
  gap: 12px;
  color: var(--cc-dark);
  position: relative;
  z-index: 1;
  list-style: none;
}

.level-details li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
  font-weight: 500;
  line-height: 1.5;
}

.level-details li::before {
  content: "✓";
  color: var(--cc-gold);
  font-weight: 900;
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.level-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.level-heading h2 {
  margin: 0;
  font-size: clamp(28px, 3.8vw, 40px);
  color: var(--cc-dark);
}

.level-heading span {
  font-weight: 600;
  color: var(--cc-medium);
}

.slide-stage {
  position: relative;
}

.slide-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(260px, 1fr);
  gap: 18px;
  overflow: hidden;
}

.slide {
  background: var(--cc-ivory);
  border-radius: 26px;
  padding: 20px;
  border: 1px solid rgba(122,90,61,0.2);
  min-height: 240px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
}

.slide h3 {
  margin: 0;
  font-size: 1.12rem;
  color: var(--cc-dark);
}

.slide p, .slide ul {
  margin: 0;
  color: rgba(76,58,52,0.85);
}

.slide ul {
  padding-left: 18px;
  display: grid;
  gap: 4px;
}

.slide .tag {
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(226,181,71,0.14);
  color: var(--cc-dark);
}

.slide-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.slide-nav button {
  pointer-events: auto;
  border: none;
  background: var(--cc-gold);
  color: var(--cc-dark);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 12px 24px rgba(76,58,52,0.2);
  transition: transform 150ms ease;
}

.slide-nav button:hover {
  transform: scale(1.05);
}

.slide-nav button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.resource-card {
  border: 1px solid rgba(122,90,61,0.2);
  border-radius: 22px;
  padding: 18px;
  background: var(--cc-ivory);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.resource-card strong {
  font-size: 1rem;
  color: var(--cc-dark);
}

iframe.chess-frame {
  width: 100%;
  border: none;
  border-radius: 24px;
  min-height: 400px;
  box-shadow: inset 0 0 0 2px rgba(76,58,52,0.15), 0 35px 60px rgba(76,58,52,0.15);
}

footer {
  padding: 24px clamp(20px, 5vw, 60px) 48px;
  text-align: center;
  font-weight: 600;
  color: rgba(76,58,52,0.75);
}

@media (max-width: 1080px) {
  .main-shell {
    grid-template-columns: 1fr;
  }

  nav.level-nav {
    order: 2;
  }
}

@media (max-width: 640px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }

  .slide-track {
    grid-auto-columns: 80%;
  }
}