/* ----- Reset / base ----- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #0b0f24;
  color: #f3efe6;
  line-height: 1.55;
  min-height: 100vh;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; }
a { color: #ffcb47; }

/* ----- Hero ----- */
.hero {
  position: relative;
  min-height: 100vh;
  padding: clamp(1rem, 3vw, 2rem);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: linear-gradient(160deg, #1a1f48 0%, #0b0f24 60%, #1a0f2e 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0.20;
  pointer-events: none;
  filter: hue-rotate(0deg);
  animation: hueShift 30s linear infinite;
}
@keyframes hueShift { to { filter: hue-rotate(360deg); } }

.topnav {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(.5rem, 2vw, 1.25rem);
  align-items: center;
  font-size: 0.95rem;
}
.topnav .brand {
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-right: auto;
  color: #ffcb47;
  font-family: Georgia, serif;
  font-size: 1.1rem;
}
.topnav a {
  color: #f3efe6;
  text-decoration: none;
  padding: .25rem .5rem;
  border-radius: 6px;
}
.topnav a:hover { background: rgba(255,255,255,0.08); color: #ffcb47; }

.hero-inner {
  position: relative;
  z-index: 2;
  margin: auto 0;
  max-width: 760px;
  padding: 3rem 0 2rem;
}
.hero h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  margin: 0 0 0.5rem;
  font-family: Georgia, serif;
  letter-spacing: -1px;
}
.khoren {
  background: linear-gradient(135deg, #ffcb47, #ff5577 50%, #6cb4ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  animation: nameShift 6s ease-in-out infinite;
}
@keyframes nameShift {
  0%, 100% { filter: hue-rotate(0deg); }
  50% { filter: hue-rotate(45deg); }
}
.tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  margin: 0 0 0.5rem;
  color: #f3efe6;
}
.lead {
  font-size: clamp(1rem, 2vw, 1.15rem);
  max-width: 60ch;
  color: #d4cfc1;
}

.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.cta {
  display: inline-block;
  padding: .85rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s;
}
.cta.primary {
  background: #ffcb47;
  color: #0b0f24;
  box-shadow: 0 6px 24px rgba(255, 203, 71, 0.35);
}
.cta.primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(255, 203, 71, 0.45); }
.cta.ghost {
  background: transparent;
  color: #f3efe6;
  border: 2px solid rgba(255,255,255,0.2);
}
.cta.ghost:hover { border-color: #ffcb47; color: #ffcb47; }

.scroll-cue {
  position: absolute;
  bottom: 1rem; left: 50%;
  width: 28px; height: 28px;
  transform: translateX(-50%);
  color: #ffcb47;
  opacity: .8;
  animation: bob 2s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ----- Cards / sections ----- */
main {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 2rem clamp(.75rem, 3vw, 2rem);
  max-width: 1080px;
  margin: 0 auto;
}
.card {
  background: linear-gradient(160deg, #161b3d 0%, #0e1330 100%);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 18px;
  padding: clamp(1rem, 2.5vw, 1.75rem);
  box-shadow: 0 16px 40px rgba(0,0,0,0.35);
}
.card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1rem;
}
.card h2 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: #ffcb47;
  letter-spacing: -.5px;
}
.tag {
  font-size: .8rem;
  color: #a9a496;
  background: rgba(255,255,255,0.05);
  padding: .25rem .6rem;
  border-radius: 999px;
}
.lede { color: #d4cfc1; max-width: 65ch; }
.hint { font-size: .85rem; color: #8c8779; }

/* ----- Who section ----- */
.who-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
  align-items: center;
}
@media (max-width: 720px) {
  .who-grid { grid-template-columns: 1fr; }
}
.quick-facts {
  list-style: none;
  padding: 0;
  display: grid;
  gap: .35rem;
  margin-top: .75rem;
}
.quick-facts li {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: .75rem;
  background: rgba(255,255,255,0.03);
  padding: .5rem .75rem;
  border-radius: 8px;
  border-left: 3px solid #ffcb47;
}
.quick-facts span {
  font-weight: 700;
  color: #ffcb47;
}
.who-portrait {
  border-radius: 12px;
  overflow: hidden;
  text-align: center;
}
.who-portrait .caption {
  font-size: .85rem;
  color: #a9a496;
  margin: .5rem 0 0;
  font-style: italic;
}

/* ----- Tessellation ----- */
.tess-controls, .mirror-controls {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1rem;
  align-items: center;
  margin-bottom: 1rem;
  padding: .75rem;
  background: rgba(0,0,0,0.2);
  border-radius: 10px;
}
.tess-controls label, .mirror-controls label {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .9rem;
  color: #d4cfc1;
}
.tess-controls select, input[type="color"] {
  background: #0b0f24;
  color: #f3efe6;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  padding: .25rem .4rem;
}
input[type="color"] {
  width: 40px; height: 30px;
  padding: 2px;
  cursor: pointer;
}
.btn {
  background: #ffcb47;
  color: #0b0f24;
  border: none;
  padding: .5rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.ghost {
  background: transparent;
  color: #f3efe6;
  border: 2px solid rgba(255,255,255,0.2);
}
.btn.ghost:hover { border-color: #ffcb47; color: #ffcb47; }
.palette { display: inline-flex; gap: .25rem; }
.palette button {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.2);
  padding: 0;
}
.palette button:hover, .palette button.active {
  border-color: #ffcb47;
  transform: scale(1.15);
}
.tess-stage {
  background: #0b0f24;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
  touch-action: none;
}
#tessSvg { width: 100%; height: auto; display: block; }
#tessSvg .tile {
  cursor: pointer;
  transition: opacity .1s;
}
#tessSvg .tile:hover { opacity: 0.85; }

/* ----- Mirror pad ----- */
.mirror-controls input[type="range"] { vertical-align: middle; }
.mirror-controls .check { gap: .25rem; }
.mirror-stage {
  background: #0b0f24;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
  display: flex;
  justify-content: center;
  touch-action: none;
}
#mirrorCanvas {
  width: 100%;
  max-width: 720px;
  height: auto;
  aspect-ratio: 1 / 1;
  display: block;
  background: #1a0f2e;
  cursor: crosshair;
}

/* ----- Stairs ----- */
.stairs-stage {
  background: #0b0f24;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  padding: 1rem;
}
#stairsSvg { width: 100%; height: auto; }
#stairsSlider { width: 100%; margin: 1rem 0 .5rem; }
.stairs-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }

/* ----- Morph ----- */
.morph-stage {
  background: #0b0f24;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
}
#morphSvg { width: 100%; height: auto; display: block; }
#morphSlider { width: 100%; margin-top: .75rem; }
.morph-row {
  display: flex;
  justify-content: space-between;
  font-size: .85rem;
  color: #a9a496;
  padding: 0 .25rem;
}

/* ----- Facts ----- */
.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.fact {
  --bg: #1a1f48;
  position: relative;
  min-height: 140px;
  padding: 1.25rem;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--bg);
  color: #f3efe6;
  font-family: Georgia, serif;
  font-size: 1.05rem;
  text-align: left;
  cursor: pointer;
  perspective: 600px;
  transition: transform .2s;
  overflow: hidden;
}
.fact:hover { transform: translateY(-3px); }
.fact::before {
  content: attr(data-front);
  position: absolute;
  inset: 0;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  background: var(--bg);
  border-radius: inherit;
  transition: opacity .25s;
}
.fact::after {
  content: attr(data-back);
  position: absolute;
  inset: 0;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #ffcb47, #ff5577);
  color: #0b0f24;
  border-radius: inherit;
  opacity: 0;
  transition: opacity .25s;
  font-size: .95rem;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}
.fact.flipped::before { opacity: 0; }
.fact.flipped::after { opacity: 1; }

/* ----- Quiz ----- */
.quiz {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.quiz-q {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 1rem;
}
.quiz-q h3 { margin: 0 0 .75rem; font-size: 1.05rem; color: #ffcb47; }
.quiz-options { display: grid; gap: .5rem; }
.quiz-options button {
  text-align: left;
  background: #0b0f24;
  color: #f3efe6;
  border: 1px solid rgba(255,255,255,0.1);
  padding: .65rem .85rem;
  border-radius: 8px;
  transition: background .15s, border-color .15s;
}
.quiz-options button:hover { border-color: #ffcb47; }
.quiz-options button.correct { background: #1f4d2b; border-color: #4ade80; color: #d6ffd9; }
.quiz-options button.wrong { background: #4d1f28; border-color: #f87171; color: #ffd6dc; }
.quiz-feedback {
  margin-top: .6rem;
  font-size: .9rem;
  color: #d4cfc1;
  min-height: 1.2em;
}
.quiz-score {
  margin-top: .5rem;
  font-weight: 700;
  color: #ffcb47;
}

/* ----- Feedback ----- */
.feedback textarea {
  width: 100%;
  background: #0b0f24;
  color: #f3efe6;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  padding: .75rem;
  font: inherit;
  resize: vertical;
}
.feedback textarea:focus { outline: 2px solid #ffcb47; outline-offset: 2px; }
.fb-row {
  display: flex;
  gap: .75rem;
  margin-top: .75rem;
  align-items: center;
  flex-wrap: wrap;
}

/* ----- Footer ----- */
footer {
  margin-top: 2rem;
  padding: 2rem 1rem 3rem;
  text-align: center;
  color: #8c8779;
  font-size: .85rem;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

/* ----- Range styling ----- */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  height: 24px;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: rgba(255,255,255,0.15);
  border-radius: 3px;
}
input[type="range"]::-moz-range-track {
  height: 6px;
  background: rgba(255,255,255,0.15);
  border-radius: 3px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  background: #ffcb47;
  border-radius: 50%;
  margin-top: -6px;
  border: 2px solid #0b0f24;
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  background: #ffcb47;
  border-radius: 50%;
  border: 2px solid #0b0f24;
  cursor: pointer;
}

/* ----- Reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
  .hero-bg, .khoren { animation: none; }
  .scroll-cue { animation: none; }
  html { scroll-behavior: auto; }
}