/* ------------------------------------------------------------------
   Bioplastic — kitchen polymer notebook
   Fraunces (display) + Manrope (body). Calm off-white paper, deep
   green ink, one warm accent. Visualisations draw on <canvas>.
------------------------------------------------------------------- */

:root {
  --bg: #f7f8f4;
  --bg-2: #eef2ea;
  --card: #ffffff;
  --ink: #17302a;
  --muted: #5b6d66;
  --faint: #93a29b;
  --line: #dfe5de;
  --leaf: #2f7d5b;
  --leaf-soft: #cfe6d8;
  --coral: #e2664a;
  --coral-soft: #f9dcd3;
  --sun: #e4b04a;
  --sun-soft: #f7ebc9;
  --sky: #4d8fb3;
  --sky-soft: #d6e6ef;
  --plum: #7a5a9e;
  --plum-soft: #e5dcef;
  --radius: 18px;
  --shadow: 0 24px 60px -30px rgba(23, 48, 42, 0.35);
  --display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --body: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--leaf); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
::selection { background: rgba(47, 125, 91, 0.18); }
canvas { display: block; }

/* ------------------------------ header ------------------------------ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 248, 244, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.8rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.wordmark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}
.wordmark:hover { text-decoration: none; }
.wordmark svg { width: 30px; height: 30px; }
.topnav { display: flex; gap: 0.2rem; margin-left: auto; flex-wrap: wrap; }
.topnav a {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease;
}
.topnav a:hover { background: var(--bg-2); color: var(--ink); text-decoration: none; }
.topnav a.active { background: var(--ink); color: #fff; }
.topnav a.home { color: var(--faint); font-weight: 500; }

.menu-btn {
  display: none;
  margin-left: auto;
  width: 42px; height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.menu-btn span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform 0.25s ease, opacity 0.25s ease; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

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

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 760px; }

section.block { padding: 4.5rem 0 1rem; }
section.block + section.block { padding-top: 3.5rem; }

.eyebrow {
  margin: 0 0 0.6rem;
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--coral);
  font-weight: 700;
}
h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(2.6rem, 5.4vw, 4.6rem);
  line-height: 1.0;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 144, "SOFT" 60;
}
h1 em, h2 em { font-style: italic; color: var(--leaf); font-weight: 400; }
h2 {
  margin: 0 0 0.6rem;
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(1.9rem, 3.2vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
}
h3 {
  margin: 0 0 0.4rem;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.2;
}
.lede { font-size: 1.2rem; color: var(--muted); max-width: 680px; margin: 1rem 0 0; }
p { margin: 0 0 1rem; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }

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

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #f2f6f0 0%, var(--bg) 100%);
}
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-inner {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: 6rem 1.5rem 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 3rem;
  align-items: end;
}
.hero-side {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  backdrop-filter: blur(8px);
  font-size: 0.98rem;
}
.hero-side strong { color: var(--ink); }
.hero-side ul { margin: 0.5rem 0 0; padding-left: 1.1rem; color: var(--muted); }
.hero-side li { margin-bottom: 0.3rem; }
.hero-cta { margin-top: 1.6rem; display: flex; gap: 0.7rem; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); box-shadow: 0 10px 24px -14px rgba(23, 48, 42, 0.6); }
.btn.ghost { background: transparent; color: var(--ink); }

/* ------------------------------ cards + grids ------------------------------ */

.grid { display: grid; gap: 1.2rem; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow);
}
.card.flat { box-shadow: none; }
.card p:last-child { margin-bottom: 0; }

.role {
  position: relative;
  padding-top: 1.6rem;
}
.role::before {
  content: "";
  position: absolute;
  top: 0; left: 1.5rem; right: 1.5rem;
  height: 4px;
  border-radius: 0 0 4px 4px;
  background: var(--role, var(--leaf));
}
.role .tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--role, var(--leaf)) 16%, white);
  color: var(--role, var(--leaf));
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.role .examples { margin-top: 0.8rem; font-size: 0.9rem; color: var(--muted); }
.role .examples b { color: var(--ink); font-weight: 700; }
.role .icon { width: 44px; height: 44px; margin-bottom: 0.6rem; }

/* ------------------------------ viz frames ------------------------------ */

.viz {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.viz canvas { width: 100%; height: auto; }
.viz-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.9rem 1.2rem;
  border-top: 1px solid var(--line);
  background: var(--bg);
  font-size: 0.92rem;
}
.viz-bar label { display: flex; align-items: center; gap: 0.6rem; color: var(--muted); font-weight: 600; }
.viz-bar output { min-width: 3.2rem; font-variant-numeric: tabular-nums; color: var(--ink); }
.viz-bar .spacer { flex: 1; }
.viz-readout { font-weight: 700; color: var(--ink); }
.viz-readout.ok { color: var(--leaf); }
.viz-readout.warn { color: var(--coral); }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 180px;
  height: 4px;
  border-radius: 4px;
  background: var(--line);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--ink); border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--ink); border: 3px solid #fff; cursor: pointer;
}

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; background: #fff; }
.seg button {
  border: 0; background: transparent; padding: 0.4rem 0.9rem;
  font: inherit; font-size: 0.88rem; font-weight: 700; color: var(--muted); cursor: pointer;
}
.seg button.active { background: var(--ink); color: #fff; }
.pill-btn {
  border: 1px solid var(--ink); background: var(--ink); color: #fff;
  padding: 0.4rem 0.95rem; border-radius: 999px; font: inherit; font-size: 0.88rem; font-weight: 700; cursor: pointer;
}
.pill-btn.ghost { background: #fff; color: var(--ink); }

/* two-column explainer with viz */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2.4rem; align-items: center; }
.split.reverse > :first-child { order: 2; }

/* ------------------------------ matrix ------------------------------ */

.matrix {
  display: grid;
  grid-template-columns: 110px 1fr 1fr;
  grid-template-rows: 44px 1fr 1fr;
  gap: 0.6rem;
}
.matrix .ax { display: grid; place-items: center; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); text-align: center; }
.matrix .ax.vert { writing-mode: vertical-rl; transform: rotate(180deg); }
.matrix .cell {
  border-radius: 14px;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  background: #fff;
  min-height: 150px;
}
.matrix .cell.best { background: var(--leaf-soft); border-color: transparent; }
.matrix .cell.mid { background: var(--sun-soft); border-color: transparent; }
.matrix .cell.worst { background: var(--coral-soft); border-color: transparent; }
.matrix .cell h4 { margin: 0 0 0.3rem; font-family: var(--display); font-size: 1.1rem; }
.matrix .cell p { margin: 0; font-size: 0.9rem; color: var(--muted); }
.matrix .cell .ex { margin-top: 0.5rem; font-size: 0.82rem; color: var(--ink); }

/* ------------------------------ steps ------------------------------ */

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 1rem; }
.step {
  counter-increment: step;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.1rem 1.1rem 1.2rem;
  position: relative;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--display);
  font-size: 1.8rem;
  color: var(--coral);
  line-height: 1;
  display: block;
  margin-bottom: 0.6rem;
}
.step h4 { margin: 0 0 0.3rem; font-size: 1rem; }
.step p { margin: 0; font-size: 0.9rem; color: var(--muted); }
.step svg { width: 100%; height: 64px; margin-bottom: 0.4rem; }

/* ------------------------------ recipe teaser cards ------------------------------ */

.recipes { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.2rem; }
.recipe-card {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  color: var(--ink);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.recipe-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); text-decoration: none; }
.recipe-card .swatch { height: 120px; background: var(--sw, var(--leaf-soft)); position: relative; }
.recipe-card .swatch canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.recipe-card .body { padding: 1rem 1.2rem 1.2rem; }
.recipe-card .kicker { font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
.recipe-card h3 { margin: 0.3rem 0 0.4rem; font-size: 1.25rem; }
.recipe-card p { margin: 0; font-size: 0.9rem; color: var(--muted); }
.recipe-card .props { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: 0.8rem; }
.chip {
  font-size: 0.74rem; font-weight: 700; padding: 0.15rem 0.55rem; border-radius: 999px;
  background: var(--bg-2); color: var(--muted);
}

/* ------------------------------ recipe page ------------------------------ */

.recipe-hero { padding: 4rem 0 2rem; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, var(--tint, var(--bg-2)) 0%, var(--bg) 100%); }
.recipe-hero .meta { display: flex; gap: 1.5rem; flex-wrap: wrap; margin-top: 1.4rem; font-size: 0.92rem; color: var(--muted); }
.recipe-hero .meta b { display: block; color: var(--ink); font-size: 1.05rem; }

.recipe-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 2.5rem; align-items: start; padding: 3rem 0; }
.recipe-side { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 1.2rem; }

.ingredients { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.ingredients th { text-align: left; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); padding: 0 0 0.5rem; font-weight: 700; }
.ingredients td { padding: 0.55rem 0; border-top: 1px solid var(--line); vertical-align: top; }
.ingredients td.qty { font-variant-numeric: tabular-nums; font-weight: 700; white-space: nowrap; padding-right: 0.8rem; }
.ingredients td .role-tag { display: block; font-size: 0.78rem; color: var(--muted); }
.scaler { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.9rem; font-size: 0.9rem; color: var(--muted); font-weight: 600; }
.scaler .seg button { padding: 0.35rem 0.75rem; }

.method { counter-reset: m; }
.method li { list-style: none; counter-increment: m; position: relative; padding: 0 0 1.4rem 3.2rem; }
.method li::before {
  content: counter(m);
  position: absolute; left: 0; top: 0.05rem;
  width: 2.2rem; height: 2.2rem; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--ink); color: #fff;
  font-family: var(--display); font-weight: 600; font-size: 1.05rem;
}
.method li::after {
  content: ""; position: absolute; left: 1.1rem; top: 2.5rem; bottom: 0.3rem; width: 1px; background: var(--line);
}
.method li:last-child::after { display: none; }
.method h4 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.method p { margin: 0; color: var(--muted); }
.method .why { display: block; margin-top: 0.4rem; font-size: 0.9rem; color: var(--leaf); font-weight: 600; }

.callout {
  border-left: 4px solid var(--coral);
  background: var(--coral-soft);
  border-radius: 0 14px 14px 0;
  padding: 0.9rem 1.1rem;
  font-size: 0.95rem;
}
.callout.green { border-color: var(--leaf); background: var(--leaf-soft); }
.callout.sun { border-color: var(--sun); background: var(--sun-soft); }
.callout b { color: var(--ink); }

dl.facts { display: grid; grid-template-columns: auto 1fr; gap: 0.35rem 1rem; margin: 0; font-size: 0.92rem; }
dl.facts dt { color: var(--muted); font-weight: 600; }
dl.facts dd { margin: 0; }

.trouble { display: grid; gap: 0.8rem; }
.trouble .row { display: grid; grid-template-columns: 1fr 1.4fr; gap: 1rem; padding: 0.8rem 1rem; border: 1px solid var(--line); border-radius: 12px; background: #fff; font-size: 0.93rem; }
.trouble .row b { display: block; color: var(--coral); }

.other-recipes { padding: 2rem 0 4rem; border-top: 1px solid var(--line); }

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

.foot {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding: 2rem 0 3rem;
  color: var(--faint);
  font-size: 0.88rem;
}
.foot .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.foot a { color: var(--muted); }

/* ------------------------------ responsive ------------------------------ */

@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 4rem; }
  .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .recipes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: 1fr; }
  .split.reverse > :first-child { order: 0; }
  .recipe-layout { grid-template-columns: 1fr; }
  .recipe-side { position: static; }
}
@media (max-width: 760px) {
  .menu-btn { display: flex; }
  .topbar-inner { position: relative; }
  .topnav {
    display: none;
    position: absolute;
    left: 1rem; right: 1rem; top: calc(100% + 0.4rem);
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.6rem;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin-left: 0;
  }
  .topnav.open { display: flex; }
  .topnav a { padding: 0.7rem 0.9rem; font-size: 1rem; border-radius: 10px; }
  .topnav a.home { border-top: 1px solid var(--line); border-radius: 0 0 10px 10px; margin-top: 0.3rem; padding-top: 0.9rem; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .grid.cols-4, .grid.cols-3, .grid.cols-2, .recipes, .steps { grid-template-columns: 1fr; }
  .matrix { grid-template-columns: 70px 1fr 1fr; }
  .matrix .cell { min-height: 0; padding: 0.8rem; }
  .trouble .row { grid-template-columns: 1fr; }
  section.block { padding: 3rem 0 0.5rem; }
  input[type="range"] { width: 130px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}