/* Finchfolio — naturalist field-notebook design. Tokens first, then layout, then components. */
:root {
  --paper: #f7f3e8;
  --paper-2: #efe8d3;
  --ink: #1b2a20;
  --ink-soft: #4a5a4f;
  --green: #2c5a3a;
  --green-deep: #1f4029;
  --butter: #f6dc7a;
  --butter-soft: #fbeeb8;
  --rule: #cdc5ab;
  --rule-soft: #e2dcc6;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Charter, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --wrap: 1120px;
  --gutter: clamp(20px, 4vw, 40px);
  --seam: clamp(64px, 9vw, 120px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 500; line-height: 1.1; margin: 0 0 0.5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.2vw, 3.25rem); text-wrap: balance; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); text-wrap: balance; }
h3 { font-size: 1.35rem; }
p { margin: 0 0 1em; }
a { color: var(--green-deep); text-underline-offset: 0.18em; }
a:hover { color: var(--green); }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--green-deep); outline-offset: 3px; }
.btn--primary:focus-visible, .spot[aria-pressed="true"]:focus-visible { outline-color: var(--ink); }
.masthead :focus-visible { outline-offset: 2px; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.eyebrow {
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--green); margin-bottom: 1.25rem;
}
.skip {
  position: absolute; left: 12px; top: -60px; padding: 8px 14px; background: var(--butter); color: var(--ink);
  font-family: var(--mono); font-size: 0.85rem; z-index: 20;
}
.skip:focus { top: 12px; }

/* Masthead + navigation */
.masthead {
  position: sticky; top: 0; z-index: 10; background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.masthead__row { display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand span { font-size: 1.15rem; letter-spacing: 0.01em; }
.brand__mark { width: 30px; height: 30px; color: var(--green); }
.nav { display: flex; gap: clamp(14px, 2vw, 28px); font-family: var(--mono); font-size: 0.8rem; }
.nav a { text-decoration: none; padding: 6px 0; border-bottom: 2px solid transparent; }
.nav a:hover { border-bottom-color: var(--butter); }
.nav-toggle {
  display: none; align-items: center; gap: 10px; background: none; border: 1px solid var(--rule);
  padding: 8px 12px; font-family: var(--mono); font-size: 0.8rem; cursor: pointer;
}
.nav-toggle__bars, .nav-toggle__bars::before, .nav-toggle__bars::after {
  display: block; width: 18px; height: 2px; background: var(--ink); content: ""; position: relative;
}
.nav-toggle__bars::before { top: -6px; } .nav-toggle__bars::after { top: 4px; }

/* Hero */
.hero { padding-block: clamp(40px, 6vw, 72px) var(--seam); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: clamp(32px, 5vw, 72px); }
.lede { font-size: 1.15rem; max-width: 34em; color: var(--ink-soft); }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 1.5rem 0 2rem; }
.btn {
  display: inline-block; padding: 12px 20px; border: 1px solid var(--green-deep); text-decoration: none;
  color: var(--green-deep); font-family: var(--mono); font-size: 0.85rem; letter-spacing: 0.03em;
}
.btn:hover { background: var(--butter-soft); color: var(--green-deep); }
.btn--primary { background: var(--green); color: var(--paper); }
.btn--primary:hover { background: var(--green-deep); color: var(--paper); }
.keyfacts {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 0; padding-top: 16px;
  border-top: 1px solid var(--rule);
}
.keyfacts dt { font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--ink-soft); }
.keyfacts dd { margin: 4px 0 0; font-size: 0.95rem; }

.plate {
  margin: 0; padding: 20px; border: 1px solid var(--ink); box-shadow: inset 0 0 0 4px var(--paper),
  inset 0 0 0 5px var(--rule); background: var(--paper-2);
}
.plate svg { display: block; width: 100%; height: auto; }
.plate__labels { font-family: var(--mono); letter-spacing: 0.08em; }
.plate figcaption { margin-top: 12px; font-size: 0.9rem; color: var(--ink-soft); }
.plate figcaption span { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--green);
  text-transform: uppercase; margin-right: 8px; }

/* Guides + tabs */
.guides { padding-block: var(--seam); border-top: 1px solid var(--rule); }
.tabs { display: flex; flex-wrap: wrap; gap: 4px; margin: 2rem 0 0; border-bottom: 1px solid var(--ink); }
.tabs [role="tab"] {
  background: none; border: 1px solid transparent; border-bottom: 0; padding: 12px 18px; cursor: pointer;
  font-family: var(--mono); font-size: 0.85rem; color: var(--ink-soft); margin-bottom: -1px;
}
.tabs [role="tab"]:hover { color: var(--ink); background: var(--butter-soft); }
.tabs [role="tab"][aria-selected="true"] {
  color: var(--ink); background: var(--butter); border-color: var(--ink); border-bottom: 1px solid var(--butter);
}
.panel { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 64px);
  padding-top: 2.5rem; }
.panel[hidden] { display: none; }
.prose { max-width: 62ch; }
.prose h3 { margin-bottom: 1rem; }
.prose strong { color: var(--green-deep); }
.margin { font-family: var(--mono); font-size: 0.85rem; line-height: 1.5; color: var(--green-deep);
  border-left: 2px solid var(--butter); padding-left: 16px; align-self: start; margin-top: 0.4rem; }
.margin p { margin-bottom: 1.25em; }

/* Cards ledger */
.cards { padding-block: var(--seam); background: var(--paper-2); border-top: 1px solid var(--rule); }
.section-lede { max-width: 60ch; color: var(--ink-soft); }
.filters { display: flex; flex-wrap: wrap; gap: 20px 40px; align-items: end; margin: 2rem 0 1.5rem; }
.filters__group { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.filters__group legend { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-soft); padding: 0; margin-bottom: 8px; }
.filters__group button {
  background: var(--paper); border: 1px solid var(--rule); padding: 7px 12px; cursor: pointer;
  font-family: var(--mono); font-size: 0.8rem; color: var(--ink);
}
.filters__group button:hover { border-color: var(--ink); }
.filters__group button[aria-pressed="true"] {
  background: var(--green); border-color: var(--green); color: var(--paper); }
.filters__status { flex-basis: 100%; margin: 0; font-family: var(--mono); font-size: 0.8rem; color: var(--ink-soft); }
.linkish { background: none; border: 0; padding: 0; margin-left: 12px; color: var(--green-deep); font: inherit;
  text-decoration: underline; text-underline-offset: 0.18em; cursor: pointer; }
.linkish:hover { color: var(--green); }

.ledger { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1px;
  background: var(--rule); border: 1px solid var(--rule); }
.card { background: var(--paper); padding: 22px 22px 20px; display: flex; flex-direction: column; }
.card[hidden] { display: none; }
.card__num { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--green); margin-bottom: 0.75rem; }
.card h3 { font-size: 1.3rem; }
.card h3 i { display: block; font-size: 0.85rem; color: var(--ink-soft); font-weight: 400; margin-top: 2px; }
.card > p:not([class]) { font-size: 0.95rem; flex-grow: 1; }
.card__tags { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-soft); margin: 0.75rem 0; }
.scale { position: relative; height: 22px; margin-top: 4px; border-bottom: 1px solid var(--ink);
  background: repeating-linear-gradient(90deg, var(--rule) 0 1px, transparent 1px 10%); }
.scale::before { content: ""; position: absolute; bottom: 0; left: calc(var(--len) * 1%); width: 2px; height: 14px;
  background: var(--green); transform: translateX(-1px); }
.scale span { position: absolute; bottom: 3px; left: calc(var(--len) * 1% + 8px); font-family: var(--mono);
  font-size: 0.7rem; background: var(--paper); padding: 0 4px; white-space: nowrap; }
.scale[style*="--len:9"] span { left: auto; right: calc(100% - var(--len) * 1% + 8px); }
.spot {
  align-self: flex-start; background: none; border: 1px solid var(--rule); padding: 6px 12px 6px 30px;
  font-family: var(--mono); font-size: 0.78rem; cursor: pointer; position: relative;
}
.spot::before { content: ""; position: absolute; left: 10px; top: 50%; width: 12px; height: 12px;
  transform: translateY(-50%); border: 1px solid var(--ink); background: var(--paper); }
.spot:hover { border-color: var(--ink); }
.spot[aria-pressed="true"] { background: var(--butter); border-color: var(--ink); }
.spot[aria-pressed="true"]::before { background: var(--green); border-color: var(--green);
  box-shadow: inset 0 0 0 2px var(--butter); }
.ledger__empty { margin-top: 1.5rem; font-family: var(--mono); font-size: 0.85rem; }

/* Notebook page */
.notebook { padding-block: var(--seam); border-top: 1px solid var(--rule); }
.notebook__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 72px);
  align-items: start; }
.disclosure { border-top: 1px solid var(--rule); padding: 12px 0; }
.disclosure:last-of-type { border-bottom: 1px solid var(--rule); }
.disclosure summary { cursor: pointer; font-family: var(--mono); font-size: 0.85rem; color: var(--green-deep);
  padding: 6px 0; list-style: none; display: flex; align-items: center; gap: 10px; }
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary::before { content: "+"; font-size: 1.1rem; width: 1em; }
.disclosure[open] summary::before { content: "–"; }
.disclosure ol { margin: 8px 0 8px 1.2em; padding: 0; font-size: 0.95rem; }
.disclosure li { margin-bottom: 6px; }
.page {
  margin: 0; padding: 28px 28px 20px 44px; background: var(--paper-2); border: 1px solid var(--rule);
  background-image: linear-gradient(var(--rule-soft) 1px, transparent 1px),
    linear-gradient(90deg, #d9a3a0 1px, transparent 1px);
  background-size: 100% 1.7rem, 100% 100%; background-position: 0 0.55rem, 30px 0; line-height: 1.7rem;
}
.page figcaption { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--green); margin-bottom: 0.4rem; }
.page__meta { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-soft); }

/* Colophon */
.colophon { background: var(--green-deep); color: var(--paper); padding-block: clamp(48px, 6vw, 80px); }
.colophon h2 { font-size: 1.2rem; color: var(--butter); }
.colophon p { font-size: 0.95rem; max-width: 52ch; color: #e6e9dc; }
.colophon__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.colophon__brand { font-family: var(--mono); font-size: 0.8rem; margin-top: 1.5rem; color: var(--butter); }
.colophon :focus-visible { outline-color: var(--butter); }

/* Responsive */
@media (max-width: 860px) {
  .hero__grid, .panel, .notebook__grid, .colophon__grid { grid-template-columns: 1fr; }
  .margin { border-left: 0; border-top: 2px solid var(--butter); padding: 12px 0 0; }
  .plate { max-width: 560px; }
}
@media (max-width: 640px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule); padding: 8px var(--gutter) 12px;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--rule-soft); font-size: 0.9rem; }
  .keyfacts { grid-template-columns: 1fr; gap: 12px; }
  .keyfacts div { display: flex; justify-content: space-between; gap: 12px; }
  .keyfacts dd { margin: 0; text-align: right; }
  .ledger { grid-template-columns: 1fr; }
  .tabs [role="tab"] { flex-grow: 1; padding: 12px 10px; font-size: 0.78rem; }
  .page { padding-left: 36px; background-position: 0 0.55rem, 24px 0; }
  .filters { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
@media print {
  .masthead, .cta-row, .filters, .spot { display: none; }
  .panel[hidden] { display: grid; }
}