/* ============================================================
   DeepCheese — design system
   Aligning Large Lunch Models for the Singularity
   ============================================================ */

:root {
  --cheese-gold: #F5B02E;
  --golden-melt: #FFC84A;
  --deep-tomato: #CF4535;
  --tomato-hi: #EA624B;
  --graphite: #11151C;
  --warm-black: #0B0D10;
  --warm-cream: #F8F5EE;
  --soft-bread: #E8DFD1;
  --slate: #43516A;
  --solar-white: #FFF4C7;

  --ink: #1A1E26;
  --ink-soft: #4A4F5B;
  --cream-line: rgba(17, 21, 28, 0.12);
  --dark-line: rgba(248, 245, 238, 0.14);
  --dark-text: rgba(248, 245, 238, 0.92);
  --dark-text-soft: rgba(248, 245, 238, 0.64);

  --font-head: "Space Grotesk", "Sora", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;

  --max-w: 1180px;
  --max-w-text: 720px;
  --nav-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--warm-cream);
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

::selection { background: var(--cheese-gold); color: var(--warm-black); }

/* ---------- typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.dark h1, .dark h2, .dark h3, .dark h4 { color: var(--dark-text); }

h1 { font-size: clamp(2.6rem, 6.5vw, 4.6rem); }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); }
h3 { font-size: clamp(1.25rem, 2.4vw, 1.6rem); }

p { max-width: var(--max-w-text); }

.lede {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  line-height: 1.6;
  color: var(--ink-soft);
}
.dark .lede { color: var(--dark-text-soft); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--deep-tomato);
  display: block;
  margin-bottom: 1.1rem;
}
.dark .eyebrow { color: var(--golden-melt); }

.mono { font-family: var(--font-mono); }

/* ---------- status chips ---------- */

.chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.32em 0.85em;
  border-radius: 999px;
  border: 1px solid var(--cream-line);
  color: var(--ink-soft);
  white-space: nowrap;
}
.dark .chip { border-color: var(--dark-line); color: var(--dark-text-soft); }
.chip.active   { border-color: var(--cheese-gold); color: #8a5f0d; background: rgba(245,176,46,0.12); }
.dark .chip.active { color: var(--golden-melt); }
.chip.concept  { border-color: var(--slate); color: var(--slate); background: rgba(67,81,106,0.08); }
.dark .chip.concept { color: #9fb0d0; border-color: #5a6b8c; background: rgba(67,81,106,0.28); }
.chip.spec     { border-color: var(--deep-tomato); color: var(--deep-tomato); background: rgba(207,69,53,0.07); }
.dark .chip.spec { color: var(--tomato-hi); }

/* ---------- layout ---------- */

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

section { padding: clamp(4rem, 9vw, 7.5rem) 0; }

.dark { background: var(--warm-black); color: var(--dark-text); }
.dark p { color: var(--dark-text-soft); }
.dark p.strong-copy { color: var(--dark-text); }
.graphite-bg { background: var(--graphite); }
.bread-bg { background: var(--soft-bread); }

.section-head { max-width: 780px; margin-bottom: clamp(2.2rem, 5vw, 3.6rem); }

/* ---------- nav ---------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(11, 13, 16, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(248,245,238,0.08);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--dark-text);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
}
.brand img { width: 30px; height: 30px; }

.nav-links {
  display: flex;
  gap: 1.7rem;
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--dark-text-soft);
  transition: color 0.18s ease;
  padding: 0.4rem 0;
}
.nav-links a:hover, .nav-links a.current { color: var(--golden-melt); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--warm-black) !important;
  background: var(--cheese-gold);
  padding: 0.62em 1.2em !important;
  border-radius: 999px;
  font-weight: 500;
  transition: background 0.18s ease;
}
.nav-cta:hover { background: var(--golden-melt); color: var(--warm-black) !important; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px; height: 44px;
  position: relative;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  position: absolute;
  left: 10px;
  width: 24px; height: 2px;
  background: var(--dark-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle span { top: 21px; }
.nav-toggle span::before { top: -7px; left: 0; }
.nav-toggle span::after { top: 7px; left: 0; }
body.menu-open .nav-toggle span { background: transparent; }
body.menu-open .nav-toggle span::before { transform: translateY(7px) rotate(45deg); }
body.menu-open .nav-toggle span::after { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0; bottom: 0;
    background: var(--warm-black);
    flex-direction: column;
    justify-content: center;
    gap: 2.2rem;
    transform: translateX(100%);
    transition: transform 0.28s ease;
  }
  body.menu-open .nav-links { transform: translateX(0); }
  .nav-links a { font-size: 1rem; }
  body.menu-open { overflow: hidden; }
}
@media (prefers-reduced-motion: reduce) {
  .nav-links { transition: none; }
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  min-height: 92vh;
  min-height: 92svh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--nav-h) + 4rem) 0 5rem;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img,
.hero-media video {
  width: 100%; height: 100%;
  object-fit: cover;
}

.sound-toggle {
  position: absolute;
  bottom: 26px;
  right: 26px;
  z-index: 5;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--dark-line);
  background: rgba(11,13,16,0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--dark-text-soft);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.sound-toggle:hover { color: var(--golden-melt); border-color: var(--golden-melt); }
.sound-toggle svg { width: 20px; height: 20px; }
.sound-toggle .icon-on { display: none; }
.sound-toggle.on { color: var(--golden-melt); border-color: rgba(245,176,46,0.6); }
.sound-toggle.on .icon-on { display: block; }
.sound-toggle.on .icon-off { display: none; }

/* hero intro overlay: logo sequence, then fade to video */
.hero-intro {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: var(--warm-black);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  cursor: pointer;
  transition: opacity 0.8s ease;
}
.hero-intro.hidden { display: none; }
.hero-intro.fade { opacity: 0; pointer-events: none; }
.hero-intro svg { width: min(18vw, 26vh); height: auto; overflow: visible; flex-shrink: 0; }

.hi-outline {
  fill: none; stroke: #F5B02E; stroke-width: 4;
  stroke-dasharray: 1; stroke-dashoffset: 1;
  transition: stroke-dashoffset 0.6s cubic-bezier(0.4,0,0.2,1), opacity 0.25s ease;
}
.hero-intro.p-draw .hi-outline { stroke-dashoffset: 0; }
.hero-intro.p-fill .hi-outline { opacity: 0; }
.hi-half { opacity: 0; transition: opacity 0.2s ease; }
.hero-intro.p-fill .hi-half { opacity: 1; }
.hi-left { transition: opacity 0.2s ease, transform 0.5s cubic-bezier(0.5,0,0.9,0.4); }
.hero-intro.p-depart .hi-left { transform: translateX(-90px) rotate(-3deg); opacity: 0; }
.hi-knife {
  stroke: #FFF4C7; stroke-width: 5; stroke-linecap: round;
  stroke-dasharray: 1; stroke-dashoffset: 1; opacity: 0;
}
.hero-intro.p-knife .hi-knife { opacity: 1; transition: stroke-dashoffset 0.28s cubic-bezier(0.7,0,0.9,1); stroke-dashoffset: 0; }
.hero-intro.p-depart .hi-knife { opacity: 0; transition: opacity 0.2s ease; }
.hi-soup { opacity: 0; transform: translateY(-300px); }
.hero-intro.p-soup .hi-soup { opacity: 1; transform: translateY(0); transition: transform 0.5s cubic-bezier(0.34,1.4,0.64,1), opacity 0.1s linear; }
.hi-brand {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4.6vw, 3.8rem);
  font-weight: 600; letter-spacing: -0.02em; color: #F8F5EE;
  opacity: 0; transform: translateY(14px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.hero-intro.p-brand .hi-brand { opacity: 1; transform: none; }
.hi-tag {
  margin-top: 0.8rem;
  font-family: var(--font-mono);
  font-size: clamp(0.68rem, 1.25vw, 0.95rem);
  letter-spacing: 0.06em; color: #FFC84A;
  min-height: 1.5em; opacity: 0; transition: opacity 0.2s ease;
}
.hero-intro.p-type .hi-tag { opacity: 1; }
.hi-cursor {
  display: inline-block; width: 0.5em; height: 1.1em;
  background: #CF4535; vertical-align: text-bottom; margin-left: 2px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
@media (max-width: 720px) {
  .hero-intro { flex-direction: column; gap: 1.5rem; text-align: center; }
  .hero-intro svg { width: min(34vw, 22vh); }
}

/* ---------- LLM-0 chat demo ---------- */

.chat {
  margin-top: 2.4rem;
  max-width: 860px;
  border: 1px solid var(--dark-line);
  border-radius: 16px;
  background: var(--warm-black);
  overflow: hidden;
}
.chat-top {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.85rem 1.2rem;
  border-bottom: 1px solid var(--dark-line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--dark-text-soft);
}
.chat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cheese-gold);
  box-shadow: 0 0 8px rgba(245,176,46,0.7);
  flex-shrink: 0;
}
.chat-meta { margin-left: auto; opacity: 0.65; text-align: right; }
.chat-log {
  height: 380px;
  overflow-y: auto;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.msg {
  max-width: 80%;
  padding: 0.7rem 1rem;
  border-radius: 14px;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--dark-text);
  overflow-wrap: break-word;
}
.msg.user {
  align-self: flex-end;
  background: rgba(245,176,46,0.13);
  border: 1px solid rgba(245,176,46,0.32);
  border-bottom-right-radius: 4px;
}
.msg.bot {
  align-self: flex-start;
  background: rgba(255,255,255,0.045);
  border: 1px solid var(--dark-line);
  border-bottom-left-radius: 4px;
}
.msg .who {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cheese-gold);
  margin-bottom: 0.35rem;
}
.msg .m-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  white-space: pre-wrap;
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--dark-line);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  margin-top: 0.55rem;
  color: var(--golden-melt);
}
.msg.typing .dots { display: inline-flex; gap: 5px; padding: 4px 0; }
.msg.typing .dots i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--dark-text-soft);
  animation: chat-bounce 1.1s ease-in-out infinite;
}
.msg.typing .dots i:nth-child(2) { animation-delay: 0.15s; }
.msg.typing .dots i:nth-child(3) { animation-delay: 0.3s; }
@keyframes chat-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-5px); opacity: 1; }
}
.chat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0 1.2rem 1rem;
}
.chat-chips button {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  padding: 0.5rem 0.85rem;
  min-height: 34px;
  border-radius: 999px;
  border: 1px solid var(--dark-line);
  background: transparent;
  color: var(--dark-text-soft);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.chat-chips button:hover { border-color: var(--cheese-gold); color: var(--cheese-gold); }
.chat-input {
  display: flex;
  border-top: 1px solid var(--dark-line);
}
.chat-input input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  outline: none;
  padding: 1rem 1.2rem;
  color: var(--dark-text);
  font-family: var(--font-body);
  font-size: 16px;
}
.chat-input input::placeholder { color: var(--dark-text-soft); opacity: 0.7; }
.chat-input button {
  border: 0;
  background: var(--cheese-gold);
  color: var(--graphite);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0 1.6rem;
  min-width: 44px;
  cursor: pointer;
  transition: background 0.2s ease;
}
.chat-input button:hover { background: var(--golden-melt); }
@media (max-width: 720px) {
  .chat-log { height: 50svh; min-height: 300px; }
  .msg { max-width: 90%; }
  .chat-meta { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .msg.typing .dots i { animation: none; opacity: 0.7; }
}

/* animated nav mark */
.brand svg.brand-mark { height: 30px; width: auto; overflow: visible; }
@media (prefers-reduced-motion: no-preference) {
  .bm-bite { animation: bm-chomp 0.5s ease-out 0.45s both; }
  .bm-soup { animation: bm-drop 0.5s cubic-bezier(0.34, 1.5, 0.64, 1) 1s both; }
}
@keyframes bm-chomp {
  0% { r: 0px; }
  40% { r: 46px; }
  60% { r: 46px; }
  100% { r: 80px; }
}
@keyframes bm-drop {
  0% { opacity: 0; transform: translateY(-120px); }
  20% { opacity: 1; }
  100% { opacity: 1; transform: translateY(0); }
}
.hero-media::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(11,13,16,0.94) 0%, rgba(11,13,16,0.45) 45%, rgba(11,13,16,0.35) 100%);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; }

/* mobile: show the full video frame edge to edge, copy below */
@media (max-width: 720px) {
  .hero {
    display: block;
    min-height: 0;
    padding: var(--nav-h) 0 3.2rem;
    background: var(--warm-black);
  }
  .hero-media {
    position: relative;
    inset: auto;
    width: 100%;
    aspect-ratio: 16 / 9;
  }
  .hero-media::after {
    background: linear-gradient(to top, rgba(11,13,16,0.6) 0%, rgba(11,13,16,0) 28%);
  }
  .hero .wrap { padding-top: 1.8rem; }
  .sound-toggle { bottom: 12px; right: 12px; width: 44px; height: 44px; }
}

/* secondary page hero with tinted background image */
.page-hero {
  position: relative;
  min-height: 62vh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--nav-h) + 4rem) 0 3.5rem;
  overflow: hidden;
  background: var(--warm-black);
}
.page-hero .hero-media::after {
  background: linear-gradient(to top, rgba(11,13,16,0.93) 0%, rgba(11,13,16,0.62) 55%, rgba(11,13,16,0.55) 100%);
}
.page-hero .wrap { position: relative; z-index: 1; }

.hero-sub {
  page-break-inside: avoid;
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  font-family: var(--font-head);
  font-weight: 500;
  color: var(--golden-melt);
  margin: 0.8rem 0 1.4rem;
  letter-spacing: -0.01em;
}

.hero-body { max-width: 620px; color: var(--dark-text-soft); }

.status-line {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dark-text-soft);
  margin-top: 1.6rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cheese-gold);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }
@media (prefers-reduced-motion: reduce) { .status-dot { animation: none; } }

.btn-row { display: flex; gap: 1rem; margin-top: 2.2rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  text-decoration: none;
  padding: 0.95em 1.9em;
  border-radius: 999px;
  transition: transform 0.15s ease, background 0.18s ease, color 0.18s ease;
}
.btn:hover { transform: translateY(-2px); }
@media (prefers-reduced-motion: reduce) { .btn:hover { transform: none; } }
.btn-gold { background: var(--cheese-gold); color: var(--warm-black); }
.btn-gold:hover { background: var(--golden-melt); }
.btn-ghost { border: 1px solid var(--dark-line); color: var(--dark-text); }
.btn-ghost:hover { border-color: var(--golden-melt); color: var(--golden-melt); }
.btn-ghost-light { border: 1px solid var(--cream-line); color: var(--ink); }
.btn-ghost-light:hover { border-color: var(--deep-tomato); color: var(--deep-tomato); }

/* ---------- cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.2rem;
}

.card {
  border: 1px solid var(--dark-line);
  border-radius: 14px;
  padding: 1.9rem 1.7rem;
  background: rgba(248,245,238,0.025);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { border-color: rgba(245,176,46,0.55); transform: translateY(-3px); }
@media (prefers-reduced-motion: reduce) { .card:hover { transform: none; } }
.card h3 {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--golden-melt);
  margin-bottom: 0.8rem;
}
.card p { font-size: 0.98rem; color: var(--dark-text-soft); }

.card-visual {
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 1.2rem;
  aspect-ratio: 3 / 2;
}
.card-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.card:hover .card-visual img { transform: scale(1.04); }
@media (prefers-reduced-motion: reduce) {
  .card:hover .card-visual img { transform: none; }
}

.card-light {
  border-color: var(--cream-line);
  background: #fff;
}
.card-light h3 { color: #8a5f0d; }
.card-light p { color: var(--ink-soft); }
.card-light:hover { border-color: var(--cheese-gold); }

/* ---------- pull quote ---------- */

.pull {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  max-width: 860px;
  color: var(--ink);
  padding-left: 1.6rem;
  border-left: 3px solid var(--cheese-gold);
}
.dark .pull { color: var(--dark-text); }
.pull .soup { color: var(--deep-tomato); }
.dark .pull .soup { color: var(--tomato-hi); }

/* ---------- split ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
@media (max-width: 880px) { .split { grid-template-columns: 1fr; } }

.figure { border-radius: 16px; overflow: hidden; position: relative; }
.figure img { width: 100%; height: 100%; object-fit: cover; }
.figcap {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-top: 0.7rem;
  text-transform: uppercase;
}
.dark .figcap { color: var(--dark-text-soft); }

/* ---------- equation cards ---------- */

.eq-card {
  border: 1px solid var(--dark-line);
  border-radius: 14px;
  padding: 1.6rem 1.6rem;
  font-family: var(--font-mono);
  background: rgba(248,245,238,0.03);
}
.eq-card .eq {
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  color: var(--golden-melt);
  margin-bottom: 0.6rem;
  overflow-x: auto;
}
.eq-card .eq-note { font-size: 0.8rem; color: var(--dark-text-soft); line-height: 1.6; }

.caveat {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.7;
  color: var(--dark-text-soft);
  border: 1px dashed var(--dark-line);
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
  margin-top: 1.2rem;
  max-width: 640px;
}
.caveat::before { content: "CAVEAT — "; color: var(--tomato-hi); letter-spacing: 0.1em; }
.caveat-light { border-color: var(--cream-line); color: var(--ink-soft); }

/* ---------- arc chain ---------- */

.chain {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}
.chain .node {
  border: 1px solid var(--dark-line);
  padding: 0.5em 1em;
  border-radius: 999px;
  color: var(--dark-text);
  white-space: nowrap;
}
.chain .node.lit { border-color: var(--cheese-gold); color: var(--golden-melt); }
.chain .node.soup-node { border-color: var(--deep-tomato); color: var(--tomato-hi); }
.chain .arrow { color: var(--dark-text-soft); }

/* ---------- roadmap chapters ---------- */

.chapter {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  border-top: 1px solid var(--dark-line);
}
.chapter:first-of-type { border-top: none; }
.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--tomato-hi);
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: block;
}
.chapter .figure img { aspect-ratio: 16 / 10; }
.chapter.flip .chapter-copy { order: 2; }
@media (max-width: 880px) {
  .chapter { grid-template-columns: 1fr; }
  .chapter.flip .chapter-copy { order: 0; }
  .chapter .figure { order: -1; }
}

/* progress rail */
.progress-rail {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--cheese-gold);
  z-index: 200;
}

/* ---------- tables / compare ---------- */

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
@media (max-width: 720px) { .compare { grid-template-columns: 1fr; } }

.obj-box {
  border-radius: 14px;
  padding: 1.8rem 1.7rem;
  border: 1px solid var(--dark-line);
}
.obj-box.bad { border-color: rgba(207,69,53,0.65); background: rgba(207,69,53,0.06); }
.obj-box.good { border-color: rgba(245,176,46,0.6); background: rgba(245,176,46,0.05); }
.obj-box h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}
.obj-box.bad h4 { color: var(--tomato-hi); }
.obj-box.good h4 { color: var(--golden-melt); }
.obj-box .mono-line {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--dark-text);
  margin-bottom: 0.8rem;
}
.obj-box p { font-size: 0.92rem; }
.obj-box ul { list-style: none; margin-top: 0.6rem; }
.obj-box li {
  font-size: 0.9rem;
  color: var(--dark-text-soft);
  padding-left: 1.3em;
  position: relative;
  margin-bottom: 0.45em;
}
.obj-box.bad li::before { content: "✕"; position: absolute; left: 0; color: var(--tomato-hi); }
.obj-box.good li::before { content: "✓"; position: absolute; left: 0; color: var(--golden-melt); }

/* ---------- lists ---------- */

.rule-list { list-style: none; counter-reset: rule; max-width: 760px; }
.rule-list li {
  counter-increment: rule;
  padding: 1.15rem 0 1.15rem 3.4rem;
  border-bottom: 1px solid var(--dark-line);
  position: relative;
  font-size: 1.02rem;
}
.rule-list.on-light li { border-color: var(--cream-line); }
.rule-list li::before {
  content: counter(rule, decimal-leading-zero);
  position: absolute;
  left: 0; top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--deep-tomato);
}
.dark .rule-list li::before { color: var(--golden-melt); }

/* ---------- faq / papers ---------- */

details {
  border-bottom: 1px solid var(--cream-line);
  padding: 1.1rem 0;
  max-width: 820px;
}
.dark details { border-color: var(--dark-line); }
summary {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 1.12rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--deep-tomato);
  font-size: 1.3rem;
  flex-shrink: 0;
}
.dark summary::after { color: var(--golden-melt); }
details[open] summary::after { content: "–"; }
details p { padding: 0.8rem 0 0.3rem; color: var(--ink-soft); }
.dark details p { color: var(--dark-text-soft); }

.paper {
  border: 1px solid var(--cream-line);
  border-radius: 14px;
  padding: 1.7rem 1.7rem;
  background: #fff;
  margin-bottom: 1.1rem;
}
.paper .paper-meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}
.paper h3 { margin-bottom: 0.55rem; font-size: 1.18rem; }
.paper p { font-size: 0.94rem; color: var(--ink-soft); }

/* ---------- gallery ---------- */

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
}
.gallery .figure img { aspect-ratio: 3 / 2; }

/* ---------- interactive widgets ---------- */

.widget {
  border: 1px solid var(--dark-line);
  border-radius: 16px;
  padding: clamp(1.4rem, 3vw, 2.2rem);
  background: rgba(248,245,238,0.03);
}
.widget-light { border-color: var(--cream-line); background: #fff; }

.tok-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 0.85em 1.1em;
  border-radius: 10px;
  border: 1px solid var(--dark-line);
  background: var(--warm-black);
  color: var(--dark-text);
  outline: none;
}
.tok-input:focus { border-color: var(--cheese-gold); }

.tok-out {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.1rem;
  min-height: 2.4rem;
}
.tok {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.3em 0.7em;
  border-radius: 7px;
  border: 1px solid;
}
.tok.whole { border-color: var(--cheese-gold); color: var(--golden-melt); background: rgba(245,176,46,0.1); }
.tok.frag { border-color: #5a6b8c; color: #9fb0d0; background: rgba(67,81,106,0.25); }
.tok-count {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--dark-text-soft);
  margin-top: 0.9rem;
}
.tok-examples { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; }
.tok-examples button {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  background: none;
  border: 1px solid var(--dark-line);
  color: var(--dark-text-soft);
  border-radius: 999px;
  padding: 0.45em 1em;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.tok-examples button:hover { border-color: var(--cheese-gold); color: var(--golden-melt); }

input[type="range"] {
  width: 100%;
  accent-color: var(--cheese-gold);
  margin: 0.8rem 0;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
}
.calc-cell {
  border: 1px solid var(--dark-line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
}
.calc-cell .v {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  color: var(--golden-melt);
  display: block;
  overflow-wrap: anywhere;
}
.calc-cell .l {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dark-text-soft);
}

/* toggle switch */
.al-toggle {
  display: inline-flex;
  border: 1px solid var(--dark-line);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1.6rem;
}
.al-toggle button {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.75em 1.6em;
  background: none;
  border: none;
  color: var(--dark-text-soft);
  cursor: pointer;
}
.al-toggle button.on-bad { background: var(--deep-tomato); color: #fff; }
.al-toggle button.on-good { background: var(--cheese-gold); color: var(--warm-black); }

/* ---------- footer ---------- */

footer {
  background: var(--warm-black);
  color: var(--dark-text-soft);
  padding: 4.5rem 0 3rem;
  border-top: 1px solid rgba(248,245,238,0.08);
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr; gap: 2rem; } }
.foot-brand {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-head);
  font-weight: 600; font-size: 1.15rem;
  color: var(--dark-text);
  margin-bottom: 0.9rem;
}
.foot-brand img { width: 26px; height: 26px; }
footer p { font-size: 0.9rem; max-width: 380px; }
.foot-links { list-style: none; }
.foot-links li { margin-bottom: 0.55rem; }
.foot-links a {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--dark-text-soft);
  transition: color 0.15s ease;
}
.foot-links a:hover { color: var(--golden-melt); }
.foot-head {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dark-text);
  margin-bottom: 1rem;
}
.foot-status {
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px solid rgba(248,245,238,0.08);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- reveal on scroll ---------- */

.rv {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
}

/* ---------- misc ---------- */

.divider-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-align: center;
}

.hr-gold {
  border: none;
  height: 2px;
  width: 64px;
  background: var(--cheese-gold);
  margin: 1.4rem 0;
}

.small-note { font-size: 0.85rem; color: var(--ink-soft); }
.dark .small-note { color: var(--dark-text-soft); }

.follow-band {
  text-align: center;
  padding: clamp(4.5rem, 9vw, 7rem) 0;
}
.follow-band h2 { margin-bottom: 1rem; }
.follow-band p { margin: 0 auto 2rem; }

/* ---------- stats band ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.2rem;
}
.stat {
  border-top: 2px solid var(--cheese-gold);
  padding-top: 1.1rem;
}
.stat .stat-v {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  letter-spacing: -0.02em;
  color: var(--dark-text);
  display: block;
  line-height: 1.1;
}
.stat .stat-l {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dark-text-soft);
  display: block;
  margin-top: 0.6rem;
  line-height: 1.6;
}

/* ---------- paired square figures ---------- */

.fig-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
@media (max-width: 720px) { .fig-pair { grid-template-columns: 1fr; } }
.fig-pair .figure img { aspect-ratio: 1 / 1; }

/* ---------- full-width figure ---------- */

.full-figure { border-radius: 16px; overflow: hidden; }
.full-figure img { width: 100%; object-fit: cover; }

/* ---------- incident log ---------- */

.incident-log {
  border: 1px solid var(--dark-line);
  border-radius: 14px;
  background: rgba(248,245,238,0.03);
  padding: 1.6rem 1.7rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.75;
}
.incident-log .inc {
  display: block;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--dark-line);
  color: var(--dark-text-soft);
}
.incident-log .inc:last-child { border-bottom: none; }
.incident-log .inc b {
  color: var(--tomato-hi);
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-right: 0.7em;
}
.incident-log .inc .res {
  color: var(--golden-melt);
}