/* ============================================================
   DP-KFC project page — hand-rolled, dependency-free
   ============================================================ */

:root{
  --bg:        #0a0a0f;
  --bg-alt:    #0d0e16;
  --panel:     #12131d;
  --panel-2:   #171826;
  --line:      #23243440;
  --line-solid:#262838;
  --text:      #e7e8f0;
  --text-dim:  #9aa0b4;
  --text-faint:#6b7088;
  --accent:    #ff5fa2;   /* magenta/pink */
  --accent-2:  #8a6bff;   /* violet */
  --accent-3:  #2bd6c4;   /* cyan */
  --radius:    16px;
  --maxw:      940px;
  --ease:      cubic-bezier(.22,1,.36,1);
  --grad:      linear-gradient(95deg, var(--accent), var(--accent-2) 55%, var(--accent-3));
  /* theme-specific surfaces overridden per theme below */
  --nav-bg:        rgba(10,10,15,.7);
  --nav-bg-solid:  rgba(10,10,15,.92);
  --img-bg:        #fff;
  --blob-blend:    screen;
  --blob-opacity:  .38;
  --grain-blend:   overlay;
  --grain-opacity: .05;
  --sb-track:      #0a0a0f;
  --sb-thumb:      #2a2c3e;
  --sel-bg:        rgba(255,95,162,.30);
  --sel-fg:        #fff;
  color-scheme: dark;
}

/* ---------- LIGHT THEME ---------- */
:root[data-theme="light"]{
  --bg:        #fbfbfd;
  --bg-alt:    #f3f3f8;
  --panel:     #ffffff;
  --panel-2:   #eeeef4;
  --line:      #1a1b2412;
  --line-solid:#e3e3ec;
  --text:      #15161e;
  --text-dim:  #55596b;
  --text-faint:#8a8fa3;
  --accent:    #d6266f;   /* darker pink for contrast on white */
  --accent-2:  #6a3ff0;   /* violet */
  --accent-3:  #0c9c8f;   /* teal (darker cyan) */
  --nav-bg:        rgba(251,251,253,.72);
  --nav-bg-solid:  rgba(251,251,253,.94);
  --img-bg:        #fff;
  --blob-blend:    multiply;
  --blob-opacity:  .20;
  --grain-blend:   multiply;
  --grain-opacity: .035;
  --sb-track:      #fbfbfd;
  --sb-thumb:      #d1d1dc;
  --sel-bg:        rgba(214,38,111,.18);
  --sel-fg:        #15161e;
  color-scheme: light;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} *{animation:none!important;transition:none!important} }

body{
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

a{color:var(--accent-3);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}

.mono{font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace}
.accent{color:var(--accent)}
.dim{color:var(--text-dim)}
.small{font-size:.85rem}
/* the title accent line: a single-colour "spotlight" radial that follows the cursor.
   --mx / --my are set by JS on pointermove over the hero; default is the centre. */
.grad{
  background:radial-gradient(circle min(360px, 42vw) at var(--mx,50%) var(--my,45%),
    var(--accent) 0%,
    color-mix(in srgb, var(--accent) 35%, var(--text-dim)) 45%,
    color-mix(in srgb, var(--accent) 12%, var(--text-dim)) 78%,
    var(--text-dim) 100%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  will-change:background-position;
}

/* ---------- scroll progress ---------- */
.progress{
  position:fixed;top:0;left:0;height:3px;width:0%;
  background:var(--grad);z-index:200;
  box-shadow:0 0 12px rgba(255,95,162,.5);
  transition:width .08s linear;
}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;gap:24px;
  padding:14px clamp(16px,4vw,40px);
  background:var(--nav-bg);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:background .3s, border-color .3s, padding .3s;
}
.nav.scrolled{background:var(--nav-bg-solid);border-bottom-color:var(--line-solid)}
.nav-brand{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.05rem;color:var(--text);letter-spacing:.02em}
.nav-brand:hover{color:var(--accent)}
.nav-links{display:flex;gap:20px;margin-left:auto;font-size:.92rem}
.nav-links a{color:var(--text-dim);position:relative;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--grad);transition:width .25s var(--ease)}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{
  font-size:.88rem;font-weight:600;color:var(--text);
  border:1px solid var(--line-solid);border-radius:999px;padding:7px 16px;
  transition:border-color .2s, color .2s, transform .2s, box-shadow .2s;
}
.nav-cta:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);box-shadow:0 4px 20px rgba(255,95,162,.18)}

/* theme toggle */
.theme-toggle{
  display:grid;place-items:center;width:36px;height:36px;flex:0 0 auto;
  background:transparent;border:1px solid var(--line-solid);border-radius:10px;
  color:var(--text-dim);cursor:pointer;transition:color .2s,border-color .2s,transform .2s,background .2s;
}
.theme-toggle:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-1px)}
.theme-toggle svg{display:block}
.theme-toggle .i-sun{display:none}
.theme-toggle .i-moon{display:block}
:root[data-theme="light"] .theme-toggle .i-sun{display:block}
:root[data-theme="light"] .theme-toggle .i-moon{display:none}
@media(max-width:760px){ .nav-links{display:none} .nav-brand{margin-right:auto} }

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;overflow:hidden;padding:clamp(60px,11vw,130px) clamp(16px,5vw,40px) clamp(48px,8vw,90px)}
.hero-bg{
  position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden;
  /* faint static fallback if <canvas> / JS is unavailable */
  background:radial-gradient(120% 80% at 22% -10%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 55%);
}
/* the synthetic "probe": an evolving structured-noise field, rendered as a crisp cell grid
   (the input DP-KFC actually feeds the network). Drawn by JS into a tiny canvas, scaled up. */
.noise-field{
  position:absolute;inset:0;width:100%;height:100%;display:block;
  opacity:var(--blob-opacity);
  image-rendering:pixelated; image-rendering:crisp-edges;
  /* slight diagonal mask so it reads as texture under the title, not a flat fill */
  -webkit-mask-image:linear-gradient(120deg, #000 30%, rgba(0,0,0,.55) 70%, rgba(0,0,0,.25));
  mask-image:linear-gradient(120deg, #000 30%, rgba(0,0,0,.55) 70%, rgba(0,0,0,.25));
}
/* fractal grain — feTurbulence is literally fractal noise, on-theme */
.grain{
  position:absolute;inset:-50%;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity:var(--grain-opacity);mix-blend-mode:var(--grain-blend);animation:grainshift 8s steps(6) infinite;
}
@keyframes grainshift{0%{transform:translate(0,0)}100%{transform:translate(-12%,7%)}}
.hero::after{ /* fade to bg at bottom */
  content:"";position:absolute;left:0;right:0;bottom:0;height:160px;
  background:linear-gradient(transparent,var(--bg));z-index:1;pointer-events:none;
}

.hero-inner{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;text-align:center}
/* gentle staggered entrance for the hero content (replaces the floaty-orb vibe) */
@keyframes heroIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.hero-inner > *{animation:heroIn .72s var(--ease) both}
.hero-inner > *:nth-child(1){animation-delay:.06s}
.hero-inner > *:nth-child(2){animation-delay:.14s}
.hero-inner > *:nth-child(3){animation-delay:.22s}
.hero-inner > *:nth-child(4){animation-delay:.28s}
.hero-inner > *:nth-child(5){animation-delay:.34s}
.hero-inner > *:nth-child(6){animation-delay:.40s}
.hero-inner > *:nth-child(7){animation-delay:.46s}
.hero-inner > *:nth-child(8){animation-delay:.54s}
.venue-pill{
  display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.78rem;letter-spacing:.04em;
  color:var(--text-dim);border:1px solid var(--line-solid);border-radius:999px;padding:6px 14px;margin-bottom:26px;
  background:rgba(255,255,255,.02);
}
.title{
  font-family:'Space Grotesk',sans-serif;font-weight:700;
  font-size:clamp(2rem,5.4vw,3.5rem);line-height:1.12;letter-spacing:-.015em;
  margin-bottom:22px;
}
.title .mono{font-size:.92em}
.authors{font-size:clamp(.95rem,2.2vw,1.08rem);color:var(--text);margin-bottom:6px;line-height:1.9}
.authors a{color:var(--text);border-bottom:1px solid transparent}
.authors a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.authors sup{color:var(--text-dim);font-size:.7em}
.affils{font-size:.86rem;color:var(--text-dim);margin-bottom:30px}
.affils sup{font-size:.85em}

.badges{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:36px}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.92rem;font-weight:600;color:var(--text);
  background:var(--panel);border:1px solid var(--line-solid);border-radius:12px;
  padding:10px 18px;transition:transform .2s var(--ease), border-color .2s, box-shadow .25s, background .2s;
}
.badge span{font-size:1em;opacity:.85}
.badge:hover{transform:translateY(-2px);border-color:var(--accent-2);box-shadow:0 8px 30px rgba(138,107,255,.22);color:var(--text)}
.badge.primary{background:var(--accent);border-color:transparent;color:#0a0a0f}
.badge.primary:hover{background:color-mix(in srgb, var(--accent) 88%, white);box-shadow:0 10px 36px color-mix(in srgb, var(--accent) 45%, transparent)}

.tldr{
  max-width:760px;margin:0 auto 34px;text-align:left;
  background:var(--panel);border:1px solid var(--line-solid);border-left:3px solid var(--accent);
  border-radius:12px;padding:18px 22px;font-size:1rem;color:var(--text-dim);
}
.tldr strong{color:var(--text)}
.tldr em{color:var(--accent-3);font-style:normal}

.scroll-hint{
  display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.78rem;color:var(--text-dim);
  letter-spacing:.1em;animation:bob 1.8s ease-in-out infinite;
}
.scroll-hint:hover{color:var(--accent)}
@keyframes bob{0%,100%{transform:translateY(0);opacity:.6}50%{transform:translateY(5px);opacity:1}}

/* ============================================================
   CONTENT BLOCKS
   ============================================================ */
.block{padding:clamp(56px,9vw,100px) clamp(16px,5vw,40px)}
.block.alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.wrap{max-width:var(--maxw);margin:0 auto}

.kicker{
  display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.78rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--accent);margin-bottom:14px;
}
h2{
  font-family:'Space Grotesk',sans-serif;font-weight:700;
  font-size:clamp(1.6rem,3.6vw,2.3rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:20px;
}
h3{font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:1.15rem;margin-bottom:10px;color:var(--text)}
h3.mt{margin-top:38px}
.block p{color:var(--text-dim);margin-bottom:16px;font-size:1.02rem}
.block p.lead{color:var(--text);font-size:1.12rem;line-height:1.6}
.block p em{color:var(--text);font-style:italic}
.block p strong{color:var(--text)}

/* equation callout */
.eqn{
  font-family:'JetBrains Mono',monospace;font-size:1.15rem;color:var(--text);
  background:var(--panel);border:1px solid var(--line-solid);border-radius:12px;
  padding:22px;text-align:center;margin:24px 0;overflow-x:auto;
  background-image:radial-gradient(circle at 20% 0%, rgba(255,95,162,.07), transparent 60%);
}
.callout{
  background:linear-gradient(180deg, rgba(138,107,255,.08), rgba(255,95,162,.05));
  border:1px solid var(--line-solid);border-radius:12px;padding:18px 22px;margin-top:24px;
  color:var(--text-dim);font-size:1.02rem;
}
.callout strong{color:var(--accent)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;margin:14px 0 36px}
.step{
  background:var(--panel);border:1px solid var(--line-solid);border-radius:var(--radius);padding:24px 22px;
  position:relative;overflow:hidden;transition:transform .25s var(--ease), border-color .25s;
}
.step:hover{transform:translateY(-3px);border-color:var(--accent-2)}
.step::before{content:"";position:absolute;inset:0 0 auto 0;height:2px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.step:hover::before{transform:scaleX(1)}
.step-n{
  font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:.95rem;color:#0a0a0f;
  width:30px;height:30px;border-radius:8px;background:var(--accent);display:grid;place-items:center;margin-bottom:14px;
}
.step p{font-size:.96rem;margin-bottom:0}

/* two-column panels */
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:14px}
@media(max-width:760px){ .twocol{grid-template-columns:1fr} }
.panel{background:var(--panel);border:1px solid var(--line-solid);border-radius:var(--radius);padding:24px 22px;transition:border-color .25s}
.panel:hover{border-color:var(--line-solid)}
.panel p{margin-bottom:0;font-size:.98rem}

/* figures */
.figcard{
  background:var(--panel);border:1px solid var(--line-solid);border-radius:var(--radius);
  overflow:hidden;margin:28px 0;
  display:grid;grid-template-rows:auto 1fr;     /* image: natural, caption: fills the rest */
  height:100%;                                  /* belt-and-suspenders for grid stretch */
}
.figcard img{
  display:block;width:100%;height:auto;background:var(--img-bg);  /* paper figures are usually on white */
  min-height:120px;
}
.figcard figcaption{
  padding:14px 18px;font-size:.9rem;line-height:1.55;color:var(--text-dim);
  border-top:1px solid var(--line-solid);background:var(--panel-2);
}
.figcard figcaption strong{color:var(--text)}
.figtag{
  display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.68rem;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;color:var(--accent);
  border:1px solid color-mix(in srgb, var(--accent) 36%, transparent);
  background:color-mix(in srgb, var(--accent) 12%, transparent);
  border-radius:6px;padding:2.5px 8px 2px;margin-right:9px;white-space:nowrap;
  position:relative;top:-1px;
}
.figgrid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0;align-items:stretch}
@media(max-width:760px){ .figgrid{grid-template-columns:1fr} }
.figgrid .figcard{margin:0}

/* bullets */
.bullets{list-style:none;margin:14px 0 0;padding:0}
.bullets li{position:relative;padding-left:22px;margin-bottom:12px;color:var(--text-dim);font-size:.98rem}
.bullets li::before{content:"▸";position:absolute;left:0;color:var(--accent);font-size:.9em;top:1px}
.bullets li strong{color:var(--text)}

/* table */
.tablewrap{overflow-x:auto;margin-top:22px;border:1px solid var(--line-solid);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:.92rem}
caption{caption-side:bottom;padding:12px 16px;font-size:.85rem;color:var(--text-dim);text-align:left}
thead th{
  text-align:left;font-family:'JetBrains Mono',monospace;font-weight:500;font-size:.8rem;letter-spacing:.04em;
  text-transform:uppercase;color:var(--text-dim);padding:12px 16px;border-bottom:1px solid var(--line-solid);
  background:var(--panel-2);
}
tbody td{padding:11px 16px;border-bottom:1px solid var(--line);color:var(--text-dim)}
tbody td:first-child{color:var(--text)}
tbody tr:last-child td{border-bottom:none}
tbody tr.hl td{background:rgba(255,95,162,.06)}
tbody tr.hl td:first-child{color:var(--accent)}
tbody tr.best td{background:linear-gradient(90deg, rgba(43,214,196,.10), rgba(138,107,255,.08))}
tbody tr.best td strong{color:var(--text)}
td .dim{font-size:.82em}

/* code box */
.codebox{position:relative;background:var(--panel);border:1px solid var(--line-solid);border-radius:var(--radius);overflow:hidden}
.codebox pre{
  font-family:'JetBrains Mono',monospace;font-size:.85rem;line-height:1.7;color:var(--text);
  padding:22px;overflow-x:auto;
}
.copybtn{
  position:absolute;top:12px;right:12px;font:inherit;font-size:.78rem;font-weight:600;
  color:var(--text-dim);background:var(--panel-2);border:1px solid var(--line-solid);border-radius:8px;
  padding:6px 12px;cursor:pointer;transition:color .2s,border-color .2s,background .2s;
}
.copybtn:hover{color:var(--text);border-color:var(--accent)}
.copybtn.ok{color:var(--accent-3);border-color:var(--accent-3)}

/* footer */
footer{padding:48px clamp(16px,5vw,40px) 60px;border-top:1px solid var(--line);background:var(--bg-alt)}
footer .wrap{text-align:center}
footer p{margin-bottom:10px;color:var(--text-dim);font-size:.95rem}
footer a{color:var(--text-dim)}
footer a:hover{color:var(--accent)}
/* partner / affiliation logos (top of hero, floating in colour) */
.partners{
  display:flex;flex-wrap:wrap;gap:46px;justify-content:center;align-items:center;
  margin:6px 0 30px;
}
.partners a{
  display:inline-flex;align-items:center;justify-content:center;line-height:0;
  transition:filter .25s var(--ease);
  animation:logoFloat 6s ease-in-out infinite;
  will-change:transform;
}
.partners img{
  height:42px;width:auto;display:block;
  transition:filter .25s var(--ease);
  pointer-events:none;          /* let the <a> own the hover/cursor (esp. for the SVG-wrapped-PNG CAFEIN asset) */
}
.partners a{cursor:pointer}     /* belt-and-suspenders: force pointer regardless of inner asset */
/* desync each logo's bob so the row breathes organically, not in lockstep */
.partners a:nth-child(1){animation-duration:5.6s; animation-delay:-0.0s}
.partners a:nth-child(2){animation-duration:6.3s; animation-delay:-1.4s}
.partners a:nth-child(3){animation-duration:5.2s; animation-delay:-2.7s}

/* theme-aware variant swap: show colour on light, white on dark */
.partners .logo-white{display:none}
:root[data-theme="dark"] .partners .logo-color{display:none}
:root[data-theme="dark"] .partners .logo-white{display:block}
/* a faint drop-shadow under each logo for visual weight */
.partners img{filter:drop-shadow(0 2px 6px rgba(0,0,0,.18))}
.partners a:hover img{filter:drop-shadow(0 6px 14px rgba(0,0,0,.22))}
:root[data-theme="dark"] .partners img{filter:drop-shadow(0 2px 8px rgba(0,0,0,.45))}
:root[data-theme="dark"] .partners a:hover img{filter:drop-shadow(0 6px 16px rgba(0,0,0,.55))}

@keyframes logoFloat{
  0%,100% { transform:translateY(0)      rotate(0deg); }
  25%     { transform:translateY(-5px)   rotate(.4deg); }
  50%     { transform:translateY(-7px)   rotate(0deg); }
  75%     { transform:translateY(-3px)   rotate(-.4deg); }
}
@media(max-width:560px){ .partners{gap:28px} .partners img{height:34px} }

/* ---------- reveal-on-scroll ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease), transform .7s var(--ease)}
.reveal.visible{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){ .reveal{opacity:1;transform:none} }

::selection{background:var(--sel-bg);color:var(--sel-fg)}

/* scrollbar (webkit) */
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--sb-track)}
::-webkit-scrollbar-thumb{background:var(--sb-thumb);border-radius:6px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{filter:brightness(1.25)}