/* ═══════════════════════════════════════════════
   Pi Explorer — Egyptian Theme Stylesheet
   ═══════════════════════════════════════════════ */

/* === Variables === */
:root {
  --bg:          #09040000;
  --bg-0:        #090401;
  --bg-1:        #110800;
  --bg-2:        #1b0d00;
  --bg-card:     #1e1000;
  --bg-card-h:   #281500;
  --gold:        #c9a227;
  --gold-lt:     #f0c840;
  --gold-pale:   #faf0c8;
  --papyrus:     #e8d5a8;
  --papyrus-m:   #a08858;
  --papyrus-d:   #6a5838;
  --red-eg:      #8b1a00;
  --teal-eg:     #1a7070;
  --text:        #ddc898;
  --border:      rgba(201,162,39,0.35);
  --glow:        rgba(201,162,39,0.18);
  --glow-h:      rgba(201,162,39,0.35);
}

/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background-color: var(--bg-0);
  color: var(--text);
  font-family: 'Lato', Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

::selection { background: rgba(201,162,39,0.35); color: var(--gold-pale); }

::-webkit-scrollbar { width: 7px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--gold); border-radius: 4px; }

/* === Typography helpers === */
.gold { color: var(--gold-lt); font-weight: 700; }
strong { color: var(--gold-lt); }
em { color: var(--papyrus); font-style: italic; }

/* ═══════════════════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════════════════ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(9,4,1,0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 2rem;
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-logo {
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: 1.7rem;
  color: var(--gold-lt);
  text-shadow: 0 0 20px rgba(240,200,64,0.5);
  line-height: 1;
  flex-shrink: 0;
}

#navbar ul { list-style: none; display: flex; gap: 1.8rem; }

#navbar ul li a {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.8rem;
  color: var(--papyrus-m);
  text-decoration: none;
  letter-spacing: 0.12em;
  transition: color 0.2s;
}
#navbar ul li a:hover { color: var(--gold-lt); }

/* Hamburger button — hidden on desktop */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}
/* Animate to × when open */
#navbar.open .hamburger span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
#navbar.open .hamburger span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#navbar.open .hamburger span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ═══════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════ */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 40%, #1e1000 0%, #0d0600 55%, #000 100%);
}

/* Floating Pi digits (background atmosphere) */
.floating-digits {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.float-d {
  position: absolute;
  font-family: 'Cinzel', Georgia, serif;
  color: rgba(201,162,39,0.07);
  animation: floatUp var(--dur, 18s) linear var(--delay, 0s) infinite;
  left: var(--x, 50%);
  font-size: var(--sz, 2rem);
}
@keyframes floatUp {
  from { transform: translateY(110vh); opacity: 0; }
  8%   { opacity: 0.9; }
  90%  { opacity: 0.4; }
  to   { transform: translateY(-10vh); opacity: 0; }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 1.5rem;
}

.hero-logo {
  width: clamp(170px, 36vw, 260px);
  height: auto;
  margin-bottom: 1.6rem;
  animation: logoFloat 5s ease-in-out infinite alternate;
  filter: drop-shadow(0 0 18px rgba(201,162,39,0.25));
}
@keyframes logoFloat {
  from { transform: translateY(0px);  filter: drop-shadow(0 0 14px rgba(201,162,39,0.2)); }
  to   { transform: translateY(-10px); filter: drop-shadow(0 0 32px rgba(201,162,39,0.55)); }
}

.hero-title {
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: clamp(1.4rem, 5vw, 3.2rem);
  color: var(--papyrus);
  letter-spacing: 0.18em;
  margin-bottom: 0.4rem;
}

.hero-subtitle {
  font-family: 'Cinzel', Georgia, serif;
  font-size: clamp(0.8rem, 2vw, 1.1rem);
  color: var(--gold);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  margin-bottom: 1.8rem;
}

.digit-marquee {
  font-family: 'Lato', monospace;
  font-size: clamp(0.75rem, 1.8vw, 1rem);
  color: var(--papyrus-d);
  letter-spacing: 0.18em;
  margin-bottom: 2.5rem;
}

.hero-btn {
  display: inline-block;
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.9rem;
  color: #0a0400;
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  padding: 0.9rem 2.6rem;
  border: none;
  border-radius: 2px;
  text-decoration: none;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 4px 22px rgba(201,162,39,0.3);
  transition: transform 0.25s, box-shadow 0.25s;
}
.hero-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(201,162,39,0.55);
}

/* Pyramid silhouettes */
.hero-pyramids {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  display: flex;
  align-items: flex-end;
  pointer-events: none;
  z-index: 1;
}
.pyramid {
  border-style: solid;
  border-color: transparent transparent #0d0600 transparent;
  opacity: 0.55;
}
.pyramid-sm  { border-width: 0 70px 110px 70px;  margin-left: 6%; }
.pyramid-lg  { border-width: 0 130px 200px 130px; margin-left: 4%; }
.pyramid-md  { border-width: 0 100px 155px 100px; margin-left: 3%; }

/* Share buttons */
.share-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 1.4rem;
}
.share-label {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--papyrus-d);
  text-transform: uppercase;
  margin-right: 0.2rem;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(201,162,39,0.06);
  color: var(--gold);
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  font-family: inherit;
}
.share-btn:hover {
  background: rgba(201,162,39,0.18);
  border-color: var(--gold);
  transform: translateY(-2px);
}
.share-li  { font-weight: 700; font-size: 0.9rem; font-family: 'Lato', sans-serif; }
.share-copy { font-size: 1rem; }

/* ═══════════════════════════════════════════════
   SECTION DIVIDER
   ═══════════════════════════════════════════════ */
.divider {
  text-align: center;
  padding: 0.6rem 0;
  position: relative;
}
.divider::before, .divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 40%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border));
}
.divider::before { left: 0; }
.divider::after  { right: 0; transform: scaleX(-1); }
.divider span {
  font-size: 1.1rem;
  color: var(--gold);
  letter-spacing: 0.55em;
  background: var(--bg-0);
  padding: 0 1rem;
  position: relative;
  z-index: 1;
}

/* ═══════════════════════════════════════════════
   CONTAINERS & TITLES
   ═══════════════════════════════════════════════ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4.5rem 2rem;
}

.section-title {
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: clamp(1.4rem, 4vw, 2.3rem);
  color: var(--gold-lt);
  text-align: center;
  letter-spacing: 0.1em;
  text-shadow: 0 0 30px rgba(240,200,64,0.2);
}
.section-title::after {
  content: '';
  display: block;
  width: 70px;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--gold), transparent);
  margin: 0.8rem auto 2.5rem;
}

.section-intro {
  text-align: center;
  font-size: 1.05rem;
  color: var(--papyrus-m);
  max-width: 680px;
  margin: -1.5rem auto 3rem;
  font-style: italic;
  line-height: 1.8;
}

/* ═══════════════════════════════════════════════
   MYSTERY OF PI SECTION
   ═══════════════════════════════════════════════ */
#mystery { background: var(--bg-1); }

.mystery-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 3.5rem;
}

.mystery-text p {
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text);
}

.circle-svg {
  width: 100%;
  max-width: 300px;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 0 18px rgba(201,162,39,0.2));
}
.animated-circle {
  animation: drawCircle 6s ease-in-out infinite alternate;
  transform-origin: 150px 150px;
}
@keyframes drawCircle {
  from { stroke-dashoffset: 0; }
  to   { stroke-dashoffset: -628; }
}

.properties-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.prop-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1.6rem;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
}
.prop-card:hover {
  background: var(--bg-card-h);
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: 0 10px 28px var(--glow);
}
.prop-icon {
  font-size: 2rem;
  color: var(--gold-lt);
  margin-bottom: 0.7rem;
  line-height: 1;
}
.prop-card h3 {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--gold);
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
  letter-spacing: 0.08em;
}
.prop-card p { font-size: 0.9rem; color: var(--papyrus-m); line-height: 1.65; }

/* ═══════════════════════════════════════════════
   EGYPT SECTION
   ═══════════════════════════════════════════════ */
#egypt {
  background: var(--bg-0);
  position: relative;
}
#egypt::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Cpath d='M30 2 L58 58 L2 58 Z' fill='none' stroke='%23c9a227' stroke-opacity='0.025' stroke-width='1'/%3E%3C/svg%3E");
  pointer-events: none;
}

.egypt-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
  position: relative;
}

.egypt-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--gold);
  border-radius: 3px;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.egypt-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 36px var(--glow);
}

.egypt-card-head {
  background: linear-gradient(135deg, #2c1600, #1a0d00);
  padding: 1.4rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.egypt-icon { font-size: 2rem; line-height: 1; flex-shrink: 0; margin-top: 0.1rem; }
.egypt-card-head h3 {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--gold-lt);
  font-size: 0.95rem;
  line-height: 1.4;
  margin-bottom: 0.25rem;
}
.egypt-date {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.78rem;
  color: var(--papyrus-d);
  letter-spacing: 0.12em;
}

.egypt-card-body { padding: 1.5rem; }
.egypt-card-body p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text);
}
.egypt-card-body p:last-child { margin-bottom: 0; }

.formula-block {
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  padding: 0.75rem 1rem;
  margin: 0.8rem 0;
  font-family: 'Lato', monospace;
  font-size: 0.88rem;
  color: var(--gold-lt);
  border-radius: 0 2px 2px 0;
}

/* ═══════════════════════════════════════════════
   TIMELINE
   ═══════════════════════════════════════════════ */
.timeline {
  position: relative;
  margin: 0 0 3.5rem;
  padding-left: 0;
}

/* The vertical gold line — draws itself down when .tl-draw is added */
.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--gold) 6%,
    var(--gold) 94%,
    transparent 100%
  );
  transform-origin: top center;
  transform: scaleY(0);
  transition: transform 1.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.timeline.tl-draw::before { transform: scaleY(1); }

/* Items — slide in from left + fade when .tl-visible is added */
.tl-item {
  display: flex;
  gap: 1.6rem;
  padding-bottom: 2rem;
  position: relative;
  opacity: 0;
  transform: translateX(-22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-item.tl-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Dot on the line — pops in with a bounce */
.tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--bg-0);
  box-shadow: 0 0 7px rgba(201,162,39,0.55);
  flex-shrink: 0;
  margin-top: 5px;
  position: relative;
  z-index: 1;
  transform: scale(0);
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s;
}
.tl-item.tl-visible .tl-dot { transform: scale(1); }

/* Larger glowing dot for landmark entries */
.tl-dot-major {
  width: 16px;
  height: 16px;
  background: var(--gold-lt);
  box-shadow: 0 0 14px rgba(240,200,64,0.7);
  margin-top: 3px;
  margin-left: -2px;
}

/* Sonar-ring ripple on major dots once visible */
.tl-dot-major::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(240,200,64,0.5);
  transform: scale(1);
  opacity: 0;
  animation: none;
}
.tl-item.tl-visible .tl-dot-major::after {
  animation: tlRipple 2.2s ease-out 0.6s infinite;
}
.tl-item.tl-visible .tl-dot-major {
  animation: tlMajorPulse 2.5s ease-in-out 0.6s infinite;
}

@keyframes tlRipple {
  0%   { transform: scale(1);   opacity: 0.7; }
  100% { transform: scale(2.8); opacity: 0; }
}
@keyframes tlMajorPulse {
  0%, 100% { box-shadow: 0 0 14px rgba(240,200,64,0.7); }
  50%       { box-shadow: 0 0 26px rgba(240,200,64,1), 0 0 44px rgba(240,200,64,0.3); }
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  .timeline::before { transition: none; transform: scaleY(1); }
  .tl-item { opacity: 1; transform: none; transition: none; }
  .tl-dot  { transform: scale(1); transition: none; }
  .tl-item.tl-visible .tl-dot-major,
  .tl-item.tl-visible .tl-dot-major::after { animation: none; }
}

.tl-content { flex: 1; min-width: 0; }

.tl-date {
  display: block;
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.tl-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}
.tl-head span { font-size: 1.1rem; line-height: 1; flex-shrink: 0; }
.tl-head h4 {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.92rem;
  color: var(--papyrus);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.tl-desc {
  font-size: 0.88rem;
  color: var(--papyrus-m);
  line-height: 1.65;
  margin-bottom: 0.4rem;
}

.tl-val {
  display: inline-block;
  font-family: 'Lato', 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--gold-lt);
  background: rgba(201,162,39,0.07);
  border: 1px solid var(--border);
  padding: 0.18rem 0.6rem;
  border-radius: 2px;
}

/* Culture section header */
.culture-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.culture-flag { font-size: 1.6rem; line-height: 1; }
.culture-header h3 {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--gold-lt);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
}
.culture-era {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.78rem;
  color: var(--papyrus-d);
  letter-spacing: 0.12em;
  margin-left: auto;
}

/* Other-cultures grid */
.cultures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0 3rem;
}

.culture-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: 3px solid rgba(201,162,39,0.5);
  border-radius: 3px;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.culture-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px var(--glow);
}
.culture-card .egypt-card-head {
  background: linear-gradient(135deg, #1e1200, #120900);
}

.comparison-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2rem;
  position: relative;
}
.comparison-box h3 {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--gold);
  text-align: center;
  font-size: 1rem;
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
}

.comp-table { display: flex; flex-direction: column; gap: 0.4rem; }
.comp-row {
  display: grid;
  grid-template-columns: 1.6fr 1.2fr 1.4fr 0.7fr;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border-radius: 2px;
  font-size: 0.88rem;
  align-items: center;
}
.comp-head {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--gold);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.7rem;
}
.comp-row:not(.comp-head) {
  background: rgba(201,162,39,0.04);
  transition: background 0.2s;
}
.comp-row:not(.comp-head):hover { background: rgba(201,162,39,0.1); }

/* ═══════════════════════════════════════════════
   FACTS SECTION
   ═══════════════════════════════════════════════ */
#facts { background: var(--bg-1); }

.facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 1.5rem;
}

.fact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
}
.fact-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--gold), transparent);
  transform: scaleX(0);
  transition: transform 0.3s;
}
.fact-card:hover::before { transform: scaleX(1); }
.fact-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px var(--glow);
  background: var(--bg-card-h);
}

.fact-num {
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: 2.2rem;
  color: rgba(201,162,39,0.15);
  line-height: 1;
  position: absolute;
  top: 0.9rem;
  right: 1rem;
}
.fact-card h3 {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--gold-lt);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  letter-spacing: 0.06em;
}
.fact-card p { font-size: 0.9rem; line-height: 1.7; color: var(--text); }
.fact-card sup { font-size: 0.7em; }

/* ═══════════════════════════════════════════════
   PI CHALLENGE / GAME
   ═══════════════════════════════════════════════ */
#challenge { background: var(--bg-0); }

.game-wrapper { max-width: 780px; margin: 0 auto; }

/* Stats bar */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 1.8rem;
  padding: 1.2rem 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
}
.stat { text-align: center; }
.stat-label {
  display: block;
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.72rem;
  color: var(--papyrus-m);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}
.stat-value {
  display: block;
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: 1.9rem;
  color: var(--papyrus);
}
.highlight-stat .stat-value { color: var(--gold-lt); }

/* Pi display area */
.pi-display-area {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1.8rem 2rem;
  margin-bottom: 1.2rem;
  min-height: 110px;
  max-height: 220px;
  overflow-y: auto;
  cursor: text;
}
.pi-display-area:hover { border-color: rgba(201,162,39,0.6); }

.pi-display {
  font-family: 'Lato', 'Courier New', monospace;
  font-size: clamp(1rem, 2.8vw, 1.35rem);
  line-height: 2;
  letter-spacing: 0.08em;
  word-break: break-all;
}
.pi-prefix {
  color: var(--gold-lt);
  font-weight: 700;
  font-size: 1.2em;
}

.digit-ok {
  color: var(--gold-lt);
  display: inline-block;
  animation: digitPop 0.18s ease;
}
@keyframes digitPop {
  from { opacity: 0; transform: scale(1.6) translateY(-4px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.digit-gap {
  display: inline-block;
  width: 0.42em;
}

.cursor-blink {
  color: var(--gold-lt);
  animation: cursorBlink 1s step-end infinite;
  font-weight: 700;
}
@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.digit-hint {
  margin-top: 0.6rem;
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.78rem;
  color: var(--papyrus-d);
  letter-spacing: 0.1em;
  text-align: center;
}

/* Game messages */
.game-msg {
  border-radius: 3px;
  padding: 1rem 1.5rem;
  margin-bottom: 1.2rem;
  font-size: 1rem;
  line-height: 1.6;
  text-align: center;
  display: none;
}
.game-msg.wrong {
  display: block;
  background: rgba(139,26,0,0.18);
  border: 1px solid rgba(200,80,60,0.4);
  color: #ff8070;
}
.game-msg.best {
  display: block;
  background: rgba(201,162,39,0.12);
  border: 1px solid var(--border);
  color: var(--gold-lt);
  animation: flashBest 0.4s ease;
}
@keyframes flashBest {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.03); }
  100% { transform: scale(1); }
}

.wrong-digit-reveal {
  display: block;
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: 2rem;
  color: var(--gold-lt);
  margin: 0.4rem 0;
}

/* Milestone message */
.milestone-msg {
  text-align: center;
  min-height: 1.8rem;
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.88rem;
  color: var(--gold);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
  transition: opacity 0.6s;
  opacity: 0;
}
.milestone-msg.visible { opacity: 1; }

/* Controls */
.game-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.btn-gold {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.9rem;
  color: #080300;
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  padding: 0.85rem 2.5rem;
  border: none;
  border-radius: 2px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(201,162,39,0.28);
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 28px rgba(201,162,39,0.5);
}
.btn-gold:active { transform: translateY(0); }

/* Hidden input (mobile) */
.hidden-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.tap-hint {
  display: none;
  text-align: center;
  font-size: 0.82rem;
  color: var(--papyrus-d);
  margin-bottom: 1.5rem;
}

/* Reference digits */
.pi-reference {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1.5rem;
}
.pi-reference h3 {
  font-family: 'Cinzel', Georgia, serif;
  color: var(--papyrus-m);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.ref-digits { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.ref-group {
  font-family: 'Lato', 'Courier New', monospace;
  font-size: 0.88rem;
  letter-spacing: 0.2em;
  padding: 0.3rem 0.65rem;
  background: rgba(201,162,39,0.05);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--papyrus-d);
  transition: color 0.4s, background 0.4s, border-color 0.4s;
}
.ref-group.lit {
  color: var(--gold-lt);
  background: rgba(201,162,39,0.13);
  border-color: rgba(201,162,39,0.5);
}

.ref-note {
  margin-top: 0.8rem;
  font-size: 0.8rem;
  color: var(--papyrus-d);
  font-style: italic;
}

/* Shake animation */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15%, 45%, 75% { transform: translateX(-7px); }
  30%, 60%, 90% { transform: translateX( 7px); }
}
.shake { animation: shake 0.38s ease; }

/* Gentle pulse */
@keyframes gentlePulse {
  0%, 100% { opacity: 0.65; transform: scale(1); }
  50%       { opacity: 1;    transform: scale(1.06); }
}

/* ═══════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════ */
footer { background: var(--bg-0); }

.footer-inner {
  text-align: center;
  padding: 3rem 2rem 2.5rem;
}
.footer-pi {
  font-family: 'Cinzel Decorative', Georgia, serif;
  font-size: 3.5rem;
  color: var(--gold);
  opacity: 0.25;
  margin-bottom: 1rem;
  line-height: 1;
}
.footer-dedication {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 1.1rem;
  color: var(--papyrus);
  margin-bottom: 1.8rem;
}
.footer-quote {
  font-style: italic;
  color: var(--papyrus-m);
  font-size: 0.93rem;
  max-width: 480px;
  margin: 0 auto 0.3rem;
  line-height: 1.7;
}
.footer-attr {
  font-family: 'Cinzel', Georgia, serif;
  font-size: 0.78rem;
  color: var(--gold);
  letter-spacing: 0.25em;
  margin-bottom: 2rem;
}
.footer-digits {
  font-family: 'Lato', monospace;
  font-size: 0.72rem;
  color: rgba(201,162,39,0.12);
  letter-spacing: 0.12em;
  overflow: hidden;
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */
@media (max-width: 800px) {
  .mystery-layout { grid-template-columns: 1fr; gap: 2rem; }
  .mystery-visual { order: -1; }
  .circle-svg { max-width: 220px; }

  .hamburger { display: flex; }
  .nav-inner { justify-content: space-between; }

  /* Dropdown panel */
  #navbar ul {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(9,4,1,0.97);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.2s ease;
  }
  #navbar.open ul {
    max-height: 400px;
    padding: 0.4rem 0 0.8rem;
  }
  #navbar ul li a {
    display: block;
    padding: 0.85rem 2rem;
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    border-bottom: 1px solid rgba(201,162,39,0.08);
  }
  #navbar ul li:last-child a { border-bottom: none; }

  .stats-bar { gap: 1.5rem; flex-wrap: wrap; padding: 1rem; }

  .comp-row {
    grid-template-columns: 1fr 1fr;
    font-size: 0.82rem;
  }

  .tap-hint { display: block; }

  .container { padding: 3rem 1.2rem; }
}

@media (max-width: 480px) {
  .facts-grid { grid-template-columns: 1fr; }
  .egypt-cards { grid-template-columns: 1fr; }
  .properties-grid { grid-template-columns: 1fr 1fr; }
  .comp-row { grid-template-columns: 1fr; gap: 0.2rem; }
  .comp-head { display: none; }
  .comp-row:not(.comp-head) span:not(:first-child) { font-size: 0.78rem; color: var(--papyrus-d); }
}