/* ═══════════════════════════════════════════════════════════
   MathVerse v2 — Cosmic Mathematics Theme
   ═══════════════════════════════════════════════════════════ */
:root {
  --bg: #030307;
  --bg2: #06070f;
  --bg3: #0a0c18;
  --surface: #0e1020;
  --surface2: #161929;
  --border: rgba(0,200,255,0.1);
  --border2: rgba(191,90,242,0.1);
  --blue: #00c8ff;
  --blue2: #0055ff;
  --purple: #bf5af2;
  --gold: #ffd700;
  --green: #00ff9d;
  --red: #ff3b30;
  --text: #e8eaf6;
  --text2: #8892b0;
  --text3: #3a4060;
  --font-display: 'Cinzel Decorative', serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-body: 'Cormorant Garamond', serif;
  --glow-blue: 0 0 20px rgba(0,200,255,0.35), 0 0 60px rgba(0,200,255,0.1);
  --glow-purple: 0 0 20px rgba(191,90,242,0.35), 0 0 60px rgba(191,90,242,0.1);
  --glow-gold: 0 0 20px rgba(255,215,0,0.35);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:1.1rem;line-height:1.7;overflow-x:hidden}
::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--blue),var(--purple));border-radius:3px}

/* ── BACKGROUND SHADER ─────────────────────────── */
#bgShader{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:0.7}

/* ── ANIMATED GRID ──────────────────────────────── */
body::before{
  content:'';position:fixed;inset:0;
  background-image:linear-gradient(rgba(0,200,255,0.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,200,255,0.03) 1px,transparent 1px);
  background-size:60px 60px;
  pointer-events:none;z-index:0;
  transition:background-position 0.1s ease;
}

/* ── NAV ────────────────────────────────────────── */
#navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  display:flex;align-items:center;justify-content:space-between;
  padding:0.75rem 1.5rem;
  background:rgba(3,3,7,0.88);backdrop-filter:blur(24px);
  border-bottom:1px solid var(--border);transition:all 0.3s;
}
.nav-logo{font-family:var(--font-display);font-size:1.1rem;color:var(--blue);
  letter-spacing:0.06em;text-shadow:var(--glow-blue);cursor:default;white-space:nowrap}
.nav-links{display:flex;gap:0;list-style:none;flex-wrap:nowrap;overflow-x:auto;
  scrollbar-width:none;-webkit-overflow-scrolling:touch}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{font-family:var(--font-mono);font-size:0.7rem;letter-spacing:0.06em;
  text-transform:uppercase;color:var(--text3);text-decoration:none;
  padding:0.35rem 0.6rem;border-radius:3px;transition:all 0.2s;white-space:nowrap}
.nav-links a:hover{color:var(--blue);background:rgba(0,200,255,0.07)}
.nav-actions{display:flex;align-items:center;gap:0.4rem;margin-left:0.5rem}
.nav-actions button{background:none;border:1px solid var(--border);color:var(--text2);
  width:32px;height:32px;border-radius:4px;cursor:pointer;font-size:0.9rem;
  transition:all 0.2s;display:flex;align-items:center;justify-content:center}
.nav-actions button:hover{border-color:var(--blue);color:var(--blue);background:rgba(0,200,255,0.08)}
.nav-toggle{display:none;cursor:pointer;font-size:1.3rem;color:var(--blue)}

/* ── KEYBOARD SHORTCUTS ─────────────────────────── */
.shortcut-hud{
  position:fixed;bottom:1.5rem;left:1.5rem;z-index:999;
  font-family:var(--font-mono);font-size:0.7rem;color:var(--text3);
  background:rgba(3,3,7,0.8);border:1px solid var(--border);
  padding:0.4rem 0.8rem;border-radius:20px;cursor:pointer;
  transition:all 0.2s;backdrop-filter:blur(10px);
}
.shortcut-hud:hover{color:var(--blue);border-color:rgba(0,200,255,0.3)}
.shortcut-overlay{
  position:fixed;inset:0;z-index:2000;display:flex;align-items:center;justify-content:center;
  background:rgba(3,3,7,0.92);backdrop-filter:blur(20px);
}
.shortcut-overlay.hidden{display:none}
.shortcut-panel{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:2rem;max-width:500px;width:90%;
}
.shortcut-panel h3{font-family:var(--font-display);color:var(--blue);margin-bottom:1.5rem;
  font-size:1.2rem;letter-spacing:0.05em}
.shortcut-grid{display:grid;grid-template-columns:auto 1fr;gap:0.5rem 1.5rem;margin-bottom:1.5rem}
kbd{font-family:var(--font-mono);font-size:0.75rem;background:var(--surface2);
  border:1px solid var(--border);padding:0.2rem 0.5rem;border-radius:3px;
  color:var(--blue);justify-self:start;white-space:nowrap}
.shortcut-grid span{font-size:0.9rem;color:var(--text2);align-self:center}

/* ── MODAL (Universe) ───────────────────────────── */
.modal{
  position:fixed;inset:0;z-index:1500;background:var(--bg);
  display:none;flex-direction:column;
}
.modal.active{display:flex}
.modal-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:0.75rem 1.5rem;background:rgba(3,3,7,0.9);
  border-bottom:1px solid var(--border);
  font-family:var(--font-mono);font-size:0.78rem;color:var(--text2);
  letter-spacing:0.05em;
}
.modal-header button{background:none;border:none;color:var(--text2);
  cursor:pointer;font-size:1.2rem;transition:color 0.2s}
.modal-header button:hover{color:var(--red)}
#universeContainer{flex:1;overflow:hidden}
#universeContainer canvas{width:100%!important;height:100%!important;display:block}

/* ── HERO ───────────────────────────────────────── */
#hero{position:relative;height:100vh;display:flex;align-items:center;
  justify-content:center;overflow:hidden}
#heroCanvas{position:absolute;inset:0;width:100%;height:100%}
.hero-content{position:relative;z-index:10;text-align:center;max-width:860px;padding:2rem}
.hero-badge{font-family:var(--font-mono);font-size:0.78rem;letter-spacing:0.2em;
  color:var(--blue);border:1px solid rgba(0,200,255,0.25);display:inline-block;
  padding:0.35rem 1rem;border-radius:20px;margin-bottom:1.5rem;
  background:rgba(0,200,255,0.04);animation:pulse-border 3s ease-in-out infinite}
@keyframes pulse-border{
  0%,100%{border-color:rgba(0,200,255,0.15);box-shadow:0 0 15px rgba(0,200,255,0.05)}
  50%{border-color:rgba(0,200,255,0.5);box-shadow:0 0 30px rgba(0,200,255,0.2)}}
.hero-title{font-family:var(--font-display);font-size:clamp(2.5rem,7vw,6rem);
  font-weight:900;line-height:1.05;margin-bottom:1.25rem;display:flex;flex-direction:column}
.hero-title .line1{color:var(--text);animation:fadeSlideUp 1s ease 0.3s both}
.hero-title .line2{background:linear-gradient(135deg,var(--blue) 0%,var(--purple) 50%,var(--gold) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  animation:fadeSlideUp 1s ease 0.6s both}
@keyframes fadeSlideUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:none}}
.hero-subtitle{font-size:1.15rem;color:var(--text2);max-width:550px;margin:0 auto 1.25rem;
  font-style:italic;animation:fadeSlideUp 1s ease 0.9s both}
.hero-formula{font-size:1.2rem;margin-bottom:1.75rem;color:var(--gold);
  filter:drop-shadow(0 0 20px rgba(255,215,0,0.35));animation:fadeSlideUp 1s ease 1.1s both}
.hero-cta-row{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;
  animation:fadeSlideUp 1s ease 1.3s both}
.hero-cta{display:inline-block;font-family:var(--font-mono);font-size:0.85rem;
  letter-spacing:0.1em;color:var(--bg);background:linear-gradient(135deg,var(--blue),var(--blue2));
  padding:0.8rem 1.8rem;border-radius:4px;text-decoration:none;transition:all 0.3s;
  box-shadow:var(--glow-blue);border:none;cursor:pointer}
.hero-cta:hover{transform:translateY(-2px);box-shadow:0 0 40px rgba(0,200,255,0.6)}
.hero-cta-alt{background:transparent;color:var(--purple);border:1px solid rgba(191,90,242,0.4);
  box-shadow:var(--glow-purple)}
.hero-cta-alt:hover{background:rgba(191,90,242,0.1);transform:translateY(-2px)}
.hero-scroll-hint{position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);
  font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.2em;color:var(--text3);
  text-transform:uppercase;animation:bounce 2s ease-in-out infinite}
@keyframes bounce{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(-8px)}}

/* ── SECTIONS ──────────────────────────────────── */
.section{padding:5.5rem 2rem;max-width:1400px;margin:0 auto;position:relative;z-index:1;
  opacity:0;transform:translateY(40px);transition:opacity 0.8s ease,transform 0.8s ease}
.section.visible{opacity:1;transform:none}
.section+.section{border-top:1px solid var(--border)}
.section-header{text-align:center;margin-bottom:3rem}
.section-num{font-family:var(--font-mono);font-size:0.7rem;color:var(--blue);
  letter-spacing:0.3em;display:block;margin-bottom:0.6rem;opacity:0.6}
.section-header h2{font-family:var(--font-display);font-size:clamp(1.8rem,5vw,3.2rem);
  color:var(--text);margin-bottom:0.6rem;letter-spacing:0.02em}
.section-header p{font-size:1.05rem;color:var(--text2);font-style:italic;
  max-width:500px;margin:0 auto}
.section-formula{margin-top:1rem;font-size:0.95rem;color:var(--purple);opacity:0.8}

/* ── PANEL ─────────────────────────────────────── */
.panel{background:var(--surface);border:1px solid var(--border);
  border-radius:10px;padding:1.5rem}

/* ── CANVAS WRAPPER ────────────────────────────── */
.canvas-fullscreen-wrap{position:relative;overflow:hidden;border-radius:8px;
  border:1px solid var(--border)}
.fullscreen-icon{position:absolute;top:0.5rem;right:0.5rem;z-index:10;
  background:rgba(3,3,7,0.7);border:1px solid var(--border);color:var(--text2);
  width:28px;height:28px;border-radius:3px;cursor:pointer;font-size:0.8rem;
  display:flex;align-items:center;justify-content:center;transition:all 0.2s;
  backdrop-filter:blur(4px)}
.fullscreen-icon:hover{color:var(--blue);border-color:rgba(0,200,255,0.4)}

/* ── TABS ──────────────────────────────────────── */
.fractal-tabs,.anim-tabs,.surfaces-tabs,.gallery-tabs,.numtheory-tabs{
  display:flex;gap:0.4rem;flex-wrap:wrap;justify-content:center;margin-bottom:1.5rem}
.ftab,.atab,.stab,.gtab,.ntab{
  font-family:var(--font-mono);font-size:0.72rem;letter-spacing:0.04em;
  padding:0.5rem 1.1rem;border-radius:4px;border:1px solid var(--border);
  background:var(--surface);color:var(--text3);cursor:pointer;transition:all 0.2s}
.ftab.active,.atab.active,.stab.active,.gtab.active,.ntab.active,
.ftab:hover,.atab:hover,.stab:hover,.gtab:hover,.ntab:hover{
  background:rgba(0,200,255,0.1);border-color:rgba(0,200,255,0.4);color:var(--blue)}

/* ── CONTROLS ──────────────────────────────────── */
.ctrl-group{margin-bottom:1.1rem}
.ctrl-group label{display:flex;align-items:center;justify-content:space-between;
  font-family:var(--font-mono);font-size:0.72rem;letter-spacing:0.04em;
  color:var(--text2);margin-bottom:0.4rem;text-transform:uppercase;flex-wrap:wrap;gap:0.3rem}
input[type=range]{width:100%;-webkit-appearance:none;height:3px;border-radius:2px;
  background:var(--surface2);outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:13px;height:13px;
  border-radius:50%;background:var(--blue);cursor:pointer;box-shadow:0 0 8px var(--blue)}
select{width:100%;background:var(--surface2);border:1px solid var(--border);
  color:var(--text);padding:0.45rem 0.7rem;border-radius:4px;
  font-family:var(--font-mono);font-size:0.78rem;cursor:pointer;outline:none}
select:focus{border-color:var(--blue)}
.ctrl-btn{display:block;width:100%;font-family:var(--font-mono);font-size:0.75rem;
  letter-spacing:0.04em;padding:0.6rem 1rem;border-radius:4px;border:1px solid var(--border);
  background:var(--surface2);color:var(--text2);cursor:pointer;transition:all 0.22s;margin-bottom:0.5rem}
.ctrl-btn:hover{border-color:rgba(0,200,255,0.5);color:var(--blue);background:rgba(0,200,255,0.07)}
.ctrl-btn.active-btn{border-color:rgba(0,200,255,0.5);color:var(--blue);
  background:rgba(0,200,255,0.08);box-shadow:var(--glow-blue)}
.hint-text{font-family:var(--font-mono);font-size:0.68rem;color:var(--text3);margin-top:0.4rem;line-height:1.5}
.info-box{background:var(--bg);border:1px solid var(--border2);border-radius:6px;
  padding:0.75rem;margin-top:0.75rem}
.info-box p{font-size:0.85rem;color:var(--text2);margin-bottom:0.3rem;line-height:1.5}
.info-box strong{color:var(--purple)}

/* ── TOGGLE ────────────────────────────────────── */
.toggle-switch{display:inline-block;position:relative;width:38px;height:20px;
  vertical-align:middle;margin-left:0.5rem}
.toggle-switch input{opacity:0;width:0;height:0}
.toggle-track{position:absolute;inset:0;background:var(--surface2);border-radius:10px;
  cursor:pointer;transition:0.3s;border:1px solid var(--border)}
.toggle-track::before{content:'';position:absolute;left:3px;top:3px;width:12px;height:12px;
  background:var(--text3);border-radius:50%;transition:0.3s}
.toggle-switch input:checked+.toggle-track{background:rgba(0,200,255,0.15);border-color:var(--blue)}
.toggle-switch input:checked+.toggle-track::before{transform:translateX(18px);background:var(--blue)}

/* ── FRACTAL LAYOUT ────────────────────────────── */
.fractal-layout{display:grid;grid-template-columns:1fr 260px;gap:1.5rem;align-items:start}
#fractalCanvas{width:100%;display:block;background:#000;cursor:crosshair;min-height:480px;
  box-shadow:0 0 60px rgba(0,80,180,0.12)}

/* ── GRAPH LAYOUT ──────────────────────────────── */
.graph-layout{display:grid;grid-template-columns:280px 1fr;gap:1.5rem;align-items:start}
.equation-inputs{margin-bottom:1rem}
.eq-row{display:flex;align-items:center;gap:0.4rem;margin-bottom:0.5rem}
.eq-color{width:11px;height:11px;border-radius:50%;flex-shrink:0}
.eq-input{flex:1;background:var(--surface2);border:1px solid var(--border);
  color:var(--text);padding:0.4rem 0.6rem;border-radius:4px;
  font-family:var(--font-mono);font-size:0.78rem;outline:none}
.eq-input:focus{border-color:var(--blue)}
.eq-remove{background:none;border:none;color:var(--text3);cursor:pointer;
  font-size:0.9rem;padding:0.2rem 0.3rem;transition:color 0.2s}
.eq-remove:hover{color:var(--red)}
.preset-eqs{margin:0.75rem 0}
.preset-label{font-family:var(--font-mono);font-size:0.65rem;color:var(--text3);
  text-transform:uppercase;letter-spacing:0.1em;margin-bottom:0.4rem}
.preset,.cpreset,.spreset{font-family:var(--font-mono);font-size:0.68rem;background:var(--surface2);
  border:1px solid var(--border);color:var(--text2);padding:0.25rem 0.55rem;
  border-radius:3px;cursor:pointer;margin:0.15rem;transition:all 0.2s}
.preset:hover,.cpreset:hover,.spreset:hover{border-color:var(--purple);color:var(--purple);
  background:rgba(191,90,242,0.07)}
.graph-canvas{border-radius:8px;border:1px solid var(--border);min-height:480px;background:var(--bg2)}

/* ── FAMOUS GRID ───────────────────────────────── */
.famous-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}
.famous-card{background:var(--surface);border:1px solid var(--border);border-radius:10px;
  padding:1.5rem;transition:all 0.3s;overflow:hidden}
.famous-card:hover{border-color:rgba(0,200,255,0.25);transform:translateY(-3px);
  box-shadow:0 20px 60px rgba(0,0,0,0.4),0 0 40px rgba(0,200,255,0.06)}
.card-title{font-family:var(--font-display);font-size:1rem;color:var(--blue);margin-bottom:0.4rem}
.card-formula{font-size:0.95rem;color:var(--gold);margin-bottom:0.75rem;min-height:2rem}
.famous-card canvas{width:100%;border-radius:5px;background:var(--bg);display:block}
.card-desc{font-style:italic;color:var(--text2);font-size:0.85rem;margin-top:0.6rem}

/* ── RIEMANN / COMPLEX / REACTION / FLUID / HYPERBOLIC ── */
.riemann-layout,.complex-layout,.reaction-layout,.fluid-layout,.hyperbolic-layout{
  display:grid;grid-template-columns:1fr 270px;gap:1.5rem;align-items:start}
#riemannCanvas,#complexCanvas,#reactionCanvas,#fluidCanvas,#hyperbolicCanvas{
  width:100%;display:block;background:#000;cursor:crosshair;min-height:500px}
.fourd-layout,.numtheory-layout,.sound-layout{
  display:grid;grid-template-columns:1fr 270px;gap:1.5rem;align-items:start}
#fourdContainer{min-height:500px;background:var(--bg)}
#fourdContainer canvas{width:100%!important;height:100%!important}
#numtheoryCanvas,#soundCanvas{width:100%;display:block;background:#000;min-height:500px}
.sound-layout{display:grid;grid-template-columns:1fr 280px;gap:1.5rem;align-items:start}

/* ── ANIMATIONS ────────────────────────────────── */
.anim-layout{display:grid;grid-template-columns:1fr 240px;gap:1.5rem;align-items:start}
#animCanvas{width:100%;display:block;background:var(--bg);min-height:500px}

/* ── PLAYGROUND ────────────────────────────────── */
.playground-layout{display:grid;grid-template-columns:1fr 270px;gap:1.5rem;align-items:start}
#playCanvas{width:100%;display:block;background:var(--bg)}
.pg-formula{font-size:1rem;color:var(--gold);text-align:center;margin-bottom:1.25rem;
  padding:0.65rem;background:var(--bg);border-radius:5px;border:1px solid rgba(255,215,0,0.12)}

/* ── 3D SURFACES ───────────────────────────────── */
.surfaces-layout{display:grid;grid-template-columns:1fr 260px;gap:1.5rem;align-items:start}
#threeContainer{aspect-ratio:4/3;background:var(--bg);min-height:400px}
.surf-info{font-family:var(--font-mono);font-size:0.68rem;color:var(--text3);
  line-height:1.6;margin-top:0.75rem;padding-top:0.75rem;border-top:1px solid var(--border)}

/* ── GALLERY ───────────────────────────────────── */
.gallery-layout{display:grid;grid-template-columns:1fr 220px;gap:1.5rem;align-items:start}
#galleryCanvas{width:100%;display:block;background:#000}

/* ── WONDER NOTIFICATION ────────────────────────── */
.wonder-notif{position:fixed;bottom:2rem;right:2rem;z-index:1200;
  background:linear-gradient(135deg,var(--surface),var(--surface2));
  border:1px solid var(--border);border-radius:8px;padding:0.75rem 1.25rem;
  font-family:var(--font-mono);font-size:0.8rem;color:var(--blue);
  box-shadow:var(--glow-blue);animation:slideInRight 0.4s ease;max-width:300px}
.wonder-notif.hidden{display:none}
@keyframes slideInRight{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:none}}

/* ── FOOTER ─────────────────────────────────────── */
footer{text-align:center;padding:4rem 2rem;border-top:1px solid var(--border);
  background:var(--bg2);position:relative;z-index:1}
.footer-formula{font-size:1.3rem;color:var(--purple);filter:drop-shadow(0 0 15px rgba(191,90,242,0.35));
  margin-bottom:1.25rem}
.footer-text{font-style:italic;font-size:1rem;color:var(--text2);margin-bottom:0.4rem}
.footer-sub{font-family:var(--font-mono);font-size:0.7rem;color:var(--text3);letter-spacing:0.1em}

/* ── TOOLTIP ────────────────────────────────────── */
.tooltip{position:fixed;background:var(--surface2);border:1px solid var(--border);
  color:var(--text);padding:0.45rem 0.7rem;border-radius:4px;font-family:var(--font-mono);
  font-size:0.72rem;pointer-events:none;z-index:9999;opacity:0;transition:opacity 0.2s;max-width:200px}

/* ── RESPONSIVE ─────────────────────────────────── */
@media(max-width:1000px){
  .fractal-layout,.graph-layout,.riemann-layout,.complex-layout,
  .reaction-layout,.fluid-layout,.hyperbolic-layout,.fourd-layout,
  .numtheory-layout,.sound-layout,.anim-layout,.playground-layout,
  .surfaces-layout,.gallery-layout{grid-template-columns:1fr}
  .nav-links{display:none}
  .nav-toggle{display:block}
}
@media(max-width:600px){
  .hero-title{font-size:2.2rem}
  .section{padding:3.5rem 1rem}
  .famous-grid{grid-template-columns:1fr}
  .hero-cta-row{flex-direction:column;align-items:center}
}

/* ═══════════════════════════════════════════
   ICON MODAL + EXPANDED FAMOUS CARDS
   ═══════════════════════════════════════════ */

/* Expand hint badge */
.card-expand-hint {
  position:absolute;top:0.6rem;right:0.6rem;
  font-family:var(--font-mono);font-size:0.6rem;letter-spacing:0.06em;
  color:var(--blue);opacity:0;transition:opacity 0.2s;
  background:rgba(0,200,255,0.08);border:1px solid rgba(0,200,255,0.2);
  padding:0.2rem 0.45rem;border-radius:3px;pointer-events:none;
}
.famous-card:hover .card-expand-hint { opacity:1; }
.famous-card { position:relative; cursor:pointer; transition:all 0.3s; }
.famous-card:hover {
  border-color:rgba(0,200,255,0.4);
  transform:translateY(-6px) scale(1.01);
  box-shadow:0 28px 60px rgba(0,0,0,0.5), 0 0 50px rgba(0,200,255,0.08);
}

/* 8-column grid (2×4 or auto-fit) */
.famous-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1.25rem;
}

/* ── ICON MODAL ─────────────────────────── */
.icon-modal-overlay {
  position:fixed;inset:0;z-index:2500;
  background:rgba(3,3,7,0.92);
  backdrop-filter:blur(20px);
  display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transition:opacity 0.3s;
}
.icon-modal-overlay.active { opacity:1; pointer-events:all; }

.icon-modal {
  background:var(--surface);
  border:1px solid rgba(0,200,255,0.2);
  border-radius:14px;
  width:min(900px,96vw);
  max-height:92vh;
  overflow-y:auto;
  padding:2rem;
  box-shadow:0 40px 100px rgba(0,0,0,0.6),0 0 60px rgba(0,200,255,0.08);
  transform:scale(0.95);
  transition:transform 0.3s;
}
.icon-modal-overlay.active .icon-modal { transform:scale(1); }

.icon-modal-header {
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:1rem;
}
.icon-modal-header h2 {
  font-family:var(--font-display);
  font-size:clamp(1.3rem,3vw,2rem);
  color:var(--blue);letter-spacing:0.03em;
}
.icon-modal-header button {
  background:none;border:1px solid rgba(255,255,255,0.15);
  color:var(--text2);width:32px;height:32px;border-radius:6px;
  cursor:pointer;font-size:1rem;transition:all 0.2s;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.icon-modal-header button:hover { background:rgba(255,59,48,0.15);border-color:var(--red);color:var(--red); }

.icon-modal-formula {
  font-size:clamp(0.9rem,2vw,1.25rem);
  color:var(--gold);
  text-align:center;
  margin-bottom:1.25rem;
  padding:0.75rem;
  background:rgba(255,215,0,0.04);
  border-radius:6px;
  border:1px solid rgba(255,215,0,0.1);
  filter:drop-shadow(0 0 15px rgba(255,215,0,0.2));
}

#iconModalCanvas {
  width:100%;
  height:420px;
  display:block;
  background:#030307;
  border-radius:8px;
  border:1px solid var(--border);
  margin-bottom:1.25rem;
}

.icon-modal-desc {
  font-size:0.95rem;color:var(--text2);line-height:1.7;
}
.icon-modal-desc p { margin-bottom:0.6rem; }
.icon-modal-desc strong { color:var(--blue); }

/* ── FOOTER CREDIT ──────────────────────── */
.footer-credit {
  margin-top:1.25rem;
  font-family:var(--font-mono);
  font-size:0.78rem;
  color:var(--text3);
  display:flex;align-items:center;justify-content:center;
  flex-wrap:wrap;gap:0.35rem;
}
.footer-heart {
  color:#ff3b30;
  animation:heartbeat 1.4s ease-in-out infinite;
  display:inline-block;font-size:1rem;
}
@keyframes heartbeat {
  0%,100%{transform:scale(1);}
  14%{transform:scale(1.25);}
  28%{transform:scale(1);}
  42%{transform:scale(1.15);}
  70%{transform:scale(1);}
}
.footer-math-love {
  color:var(--purple);font-size:0.72rem;
}
.footer-author {
  display:inline-flex;align-items:center;gap:0.35rem;
  color:var(--blue);text-decoration:none;
  border:1px solid rgba(0,200,255,0.25);
  padding:0.2rem 0.55rem;border-radius:20px;
  background:rgba(0,200,255,0.05);
  transition:all 0.25s;
}
.footer-author:hover {
  background:rgba(0,200,255,0.12);
  border-color:rgba(0,200,255,0.6);
  box-shadow:0 0 18px rgba(0,200,255,0.25);
  color:#fff;
}
.footer-author-name { font-weight:700;letter-spacing:0.06em; }
.footer-linkedin { opacity:0.8; }

@media(max-width:600px){
  #iconModalCanvas { height:260px; }
  .icon-modal { padding:1.25rem; }
}

/* ═══════════════════════════════════════════
   ADVANCED VISUALIZATION SECTIONS
   ═══════════════════════════════════════════ */
.adv-section { border-top: 1px solid rgba(0,200,255,0.06); }
.adv-num { background: linear-gradient(135deg,rgba(191,90,242,0.15),rgba(0,200,255,0.08)); border-color: rgba(191,90,242,0.3); color: var(--purple); }
.adv-layout { display: grid; grid-template-columns: 1fr 300px; gap: 1.5rem; align-items: start; }
.adv-layout canvas { width: 100%; min-height: 500px; background: #030307; border-radius: 10px; border: 1px solid var(--border); display: block; }
.adv-panel { position: sticky; top: 70px; }
.adv-formula-box { background: rgba(191,90,242,0.06); border: 1px solid rgba(191,90,242,0.2); border-radius: 6px; padding: 0.75rem; text-align: center; margin-bottom: 1rem; font-size: 0.8rem; color: var(--purple); }
.adv-info { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text3); margin-top: 0.75rem; line-height: 1.6; }
.adv-legend { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 0.75rem; font-family: var(--font-mono); font-size: 0.75rem; }
.mc-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; margin-top: 0.75rem; }
.mc-stat { background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem; text-align: center; }
.mc-label { display: block; font-size: 0.65rem; color: var(--text3); font-family: var(--font-mono); margin-bottom: 0.2rem; }
.mc-val { display: block; font-size: 1rem; font-weight: 700; color: var(--blue); font-family: var(--font-mono); }
.mc-pi { color: var(--gold) !important; font-size: 1.2rem !important; }
.toggle-switch { display:inline-flex;align-items:center;cursor:pointer;vertical-align:middle;margin-left:0.5rem; }
.toggle-switch input { display:none; }
.toggle-track { width:36px;height:18px;background:rgba(255,255,255,0.1);border-radius:9px;position:relative;transition:background 0.2s;border:1px solid rgba(255,255,255,0.15); }
.toggle-track::after { content:'';position:absolute;top:2px;left:2px;width:12px;height:12px;background:#fff;border-radius:50%;transition:left 0.2s; }
.toggle-switch input:checked + .toggle-track { background:rgba(0,200,255,0.4);border-color:var(--blue); }
.toggle-switch input:checked + .toggle-track::after { left:20px; }
@media(max-width:900px){ .adv-layout { grid-template-columns:1fr; } .adv-panel { position:static; } }

/* Canvas sizing for all adv sections */
#mandelbulbCanvas, #quatCanvas { height: 520px !important; }
#schrodCanvas, #mcCanvas, #lyapCanvas, #kuramotoCanvas, #boidsCanvas, #curvCanvas { height: 500px !important; }
#minimalContainer, #hopfContainer, #geodesicContainer, #riemannSurfContainer, #cyContainer, #shContainer { height: 520px; }
.adv-layout > canvas, .adv-layout > .canvas-fullscreen-wrap { min-height: 500px; }

/* Discovery Mode button */
.discovery-fab {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 1000;
  background: linear-gradient(135deg, #bf5af2, #00c8ff);
  color: #fff; border: none; border-radius: 50px;
  padding: 0.9rem 1.5rem; font-family: var(--font-mono);
  font-size: 0.8rem; font-weight: 700; cursor: pointer;
  box-shadow: 0 8px 32px rgba(191,90,242,0.4);
  transition: all 0.3s; letter-spacing: 0.05em;
  display: flex; align-items: center; gap: 0.5rem;
}
.discovery-fab:hover { transform: translateY(-3px); box-shadow: 0 16px 48px rgba(191,90,242,0.6); }

/* ═══════════════════════════════════════════════
   GENERATIVE ART SECTIONS
   ═══════════════════════════════════════════════ */
.art-divider-section { padding: 4rem 2rem; text-align: center; }
.art-divider-inner { display: flex; align-items: center; gap: 2rem; max-width: 900px; margin: 0 auto; }
.art-divider-line { flex: 1; height: 1px; background: linear-gradient(90deg, transparent, rgba(191,90,242,0.4), transparent); }
.art-divider-content { text-align: center; min-width: 320px; }
.art-divider-icon { font-size: 2.5rem; display: block; margin-bottom: 0.5rem; }
.art-divider-title { font-family: var(--font-display); font-size: 1.8rem; background: linear-gradient(135deg,#bf5af2,#00c8ff,#ffd700); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 0.4rem; }
.art-divider-sub { color: var(--text3); font-family: var(--font-body); font-size: 0.95rem; margin-bottom: 1rem; }
.art-mode-toggle { display: inline-flex; align-items: center; gap: 0.6rem; cursor: pointer; font-family: var(--font-mono); font-size: 0.8rem; color: var(--purple); }
.art-mode-label { user-select: none; }

/* Art section styling */
.art-section { border-top: 1px solid rgba(191,90,242,0.08); position: relative; }
.art-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 50% 0%, rgba(191,90,242,0.03) 0%, transparent 60%); pointer-events: none; }
.art-num { background: linear-gradient(135deg, rgba(255,215,0,0.1), rgba(191,90,242,0.08)); border-color: rgba(255,215,0,0.3); color: var(--gold); }
.art-layout { display: grid; grid-template-columns: 1fr 280px; gap: 1.5rem; align-items: start; }
.art-canvas-wrap { position: relative; border-radius: 12px; overflow: hidden; border: 1px solid rgba(191,90,242,0.15); box-shadow: 0 0 40px rgba(191,90,242,0.08); }
.art-canvas-wrap canvas { width: 100%; height: 540px; display: block; background: #020205; }
.art-panel { position: sticky; top: 70px; }

/* Art Mode bloom overlay */
body.art-mode-on .art-canvas-wrap { box-shadow: 0 0 80px rgba(191,90,242,0.25), 0 0 20px rgba(0,200,255,0.1); }
body.art-mode-on .art-section::before { background: radial-gradient(ellipse at 50% 0%, rgba(191,90,242,0.06) 0%, transparent 60%); }

@media(max-width:900px){ .art-layout{ grid-template-columns:1fr; } .art-panel{ position:static; } }