/* D-Plane Fit — Sandhills geometry lab. System faces only. */
:root {
  --df-pine: #1e3a2a;
  --df-pine-mid: #2d5340;
  --df-needle: #3f6b52;
  --df-brick: #b45a38;
  --df-brick-deep: #8c3e26;
  --df-brass: #c4a45a;
  --df-brass-deep: #8f7438;
  --df-chalk: #f6f1e4;
  --df-board: #24362c;
  --df-dust: #e8dcc8;
  --df-paper: #f3ece0;
  --df-ink: #1a1712;
  --df-ink-soft: #4a4338;
  --df-ink-faint: #7a7164;
  --df-white: #fffcf5;
  --df-display: "Century Schoolbook", "Century Schoolbook L", Georgia, "Times New Roman", serif;
  --df-body: "Avenir Next", "Avenir", "Century Gothic", system-ui, sans-serif;
  --df-mark: "Avenir Next Condensed", "Avenir Next", system-ui, sans-serif;
  --df-max: 1180px;
  --df-gutter: 20px;
  --df-shadow: 0 22px 48px -28px rgba(30, 58, 42, 0.55);
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  padding: 0;
}

body.df-slate {
  background:
    linear-gradient(135deg, rgba(196, 164, 90, 0.05) 25%, transparent 25%) -12px 0 / 24px 24px,
    linear-gradient(225deg, rgba(180, 90, 56, 0.04) 25%, transparent 25%) -12px 0 / 24px 24px,
    radial-gradient(900px 420px at 92% -8%, rgba(30, 58, 42, 0.12), transparent 58%),
    var(--df-paper);
  color: var(--df-ink);
  font-family: var(--df-body);
  font-size: 17px;
  line-height: 1.68;
}

body.df-locked { overflow: hidden; }

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

a {
  color: var(--df-brick-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { color: var(--df-pine); }

h1, h2, h3, h4 {
  font-family: var(--df-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.12;
  color: var(--df-pine);
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.2rem, 5.6vw, 3.85rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2.05rem); }
h3 { font-size: 1.18rem; }

p { margin: 0 0 1em; }

ul, ol { margin: 0 0 1em; padding: 0 0 0 1.15em; }

address { font-style: normal; }

.df-frame {
  width: min(var(--df-max), calc(100% - (var(--df-gutter) * 2)));
  margin-inline: auto;
}

.df-skip {
  position: absolute;
  left: 14px;
  top: -52px;
  background: var(--df-pine);
  color: var(--df-chalk);
  padding: 8px 14px;
  z-index: 90;
  font-size: 0.84rem;
}

.df-skip:focus { top: 10px; }

.df-lintel {
  background: var(--df-brick);
  color: var(--df-chalk);
  font-family: var(--df-mark);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem 1.4rem;
  padding: 0.42rem 1rem;
}

.df-lintel__tick {
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  background: var(--df-brass);
  display: inline-block;
  align-self: center;
}

.df-markhead {
  position: relative;
  z-index: 40;
  background: var(--df-chalk);
  border-bottom: 3px solid var(--df-pine);
}

.df-markhead.is-stuck {
  box-shadow: 0 12px 30px -20px rgba(30, 58, 42, 0.7);
}

.df-markhead__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 82px;
}

.df-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.df-brand__glyph {
  color: var(--df-brass-deep);
  display: flex;
  background: var(--df-pine);
  padding: 4px 6px;
}

.df-brand__glyph svg { display: block; color: var(--df-brass); }

.df-brand__copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.df-brand__name {
  font-family: var(--df-display);
  font-size: 1.28rem;
  color: var(--df-pine);
  letter-spacing: -0.02em;
}

.df-brand__place {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--df-brick);
}

.df-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--df-brass);
  background: var(--df-white);
  cursor: pointer;
  position: relative;
}

.df-toggle span {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--df-pine);
  transition: transform 0.2s ease, opacity 0.2s ease, top 0.2s ease;
}

.df-toggle span:nth-child(1) { top: 15px; }
.df-toggle span:nth-child(2) { top: 22px; }
.df-toggle span:nth-child(3) { top: 29px; }

.df-toggle.is-open span:nth-child(1) { top: 22px; transform: rotate(40deg); }
.df-toggle.is-open span:nth-child(2) { opacity: 0; }
.df-toggle.is-open span:nth-child(3) { top: 22px; transform: rotate(-40deg); }

.df-menu {
  display: flex;
  align-items: center;
  gap: 18px;
}

.df-menu__list {
  display: flex;
  list-style: none;
  gap: 4px 12px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.df-menu__list a {
  color: var(--df-ink-soft);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.df-menu__list a:hover,
.df-menu__list .is-here a {
  color: var(--df-pine);
  border-bottom-color: var(--df-brass);
}

.df-hold {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--df-pine);
  color: var(--df-chalk) !important;
  text-decoration: none !important;
  padding: 0.64rem 1.05rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--df-pine);
  transition: background 0.16s ease, transform 0.16s ease;
}

.df-hold:hover {
  background: var(--df-brick);
  border-color: var(--df-brick);
  transform: translateY(-1px);
}

.df-act {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.74rem 1.25rem;
  text-decoration: none !important;
  font-size: 0.86rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border: 1px solid var(--df-pine);
  background: var(--df-pine);
  color: var(--df-chalk) !important;
  transition: transform 0.16s ease, background 0.16s ease;
}

.df-act:hover {
  transform: translateY(-2px);
  background: var(--df-brick);
  border-color: var(--df-brick);
}

.df-act--ghost {
  background: transparent;
  color: var(--df-pine) !important;
  border-color: var(--df-pine);
}

.df-act--ghost:hover {
  background: var(--df-pine);
  color: var(--df-chalk) !important;
}

.df-act--block { width: 100%; }

.df-work { min-height: 48vh; }

.df-kicker {
  font-family: var(--df-mark);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--df-brick);
  margin: 0 0 0.8rem;
}

.df-lede {
  font-size: 1.12rem;
  color: var(--df-ink-soft);
  max-width: 40em;
}

.df-splash {
  padding: 3.6rem 0 2.6rem;
  position: relative;
}

.df-splash__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(240px, 0.85fr);
  gap: 36px 48px;
  align-items: stretch;
}

.df-splash__copy { padding-top: 0.4rem; }

.df-splash__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.5rem;
}

.df-board {
  background:
    radial-gradient(circle at 18% 20%, rgba(246, 241, 228, 0.08), transparent 42%),
    var(--df-board);
  color: var(--df-chalk);
  padding: 1.6rem 1.4rem 1.4rem;
  box-shadow: var(--df-shadow);
  position: relative;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.df-board::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(196, 164, 90, 0.35);
  pointer-events: none;
}

.df-board h2,
.df-board h3 { color: var(--df-chalk); }

.df-board .df-kicker { color: var(--df-brass); }

.df-triad {
  width: min(100%, 280px);
  margin: 0.4rem auto 0.8rem;
}

.df-triad svg { width: 100%; height: auto; display: block; }

.df-board ol {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.92rem;
}

.df-board ol li {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 8px;
  padding: 0.45rem 0;
  border-top: 1px dashed rgba(196, 164, 90, 0.35);
}

.df-board ol b {
  font-family: var(--df-display);
  color: var(--df-brass);
  font-weight: 600;
}

.df-slab {
  padding: 3.1rem 0;
}

.df-slab--pine {
  background: var(--df-pine);
  color: var(--df-chalk);
}

.df-slab--pine h2,
.df-slab--pine h3 { color: var(--df-chalk); }

.df-slab--pine .df-kicker { color: var(--df-brass); }

.df-slab--dust {
  background:
    linear-gradient(180deg, rgba(180, 90, 56, 0.07), transparent 40%),
    var(--df-dust);
  border-block: 1px solid rgba(30, 58, 42, 0.1);
}

.df-slab--chalk {
  background: var(--df-chalk);
}

.df-split {
  display: grid;
  grid-template-columns: 0.42fr 0.58fr;
  gap: 32px 56px;
  align-items: start;
}

.df-split--flip { grid-template-columns: 0.58fr 0.42fr; }

.df-split--even { grid-template-columns: 1fr 1fr; }

.df-rise {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.df-rise.is-in {
  opacity: 1;
  transform: none;
}

.df-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: df-win;
}

.df-steps > li {
  counter-increment: df-win;
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  gap: 16px;
  padding: 1.1rem 0;
  border-top: 1px solid rgba(30, 58, 42, 0.16);
}

.df-steps > li::before {
  content: counter(df-win, decimal-leading-zero);
  font-family: var(--df-display);
  color: var(--df-brass-deep);
  font-size: 1.05rem;
  padding-top: 0.2rem;
}

.df-steps h3 { margin-bottom: 0.2rem; }

.df-panes {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 1fr;
  gap: 14px;
}

.df-pane {
  background: var(--df-white);
  border: 1px solid rgba(30, 58, 42, 0.12);
  padding: 1.25rem 1.15rem 1.1rem;
  box-shadow: var(--df-shadow);
}

.df-pane:nth-child(2) {
  transform: translateY(18px);
  border-top: 4px solid var(--df-brick);
}

.df-pane:nth-child(3) {
  transform: translateY(8px);
  border-top: 4px solid var(--df-brass);
}

.df-pane:nth-child(1) { border-top: 4px solid var(--df-pine); }

.df-pane p:last-child { margin-bottom: 0; }

.df-voices {
  display: grid;
  grid-template-columns: 0.9fr 1.2fr 0.9fr;
  gap: 18px;
}

.df-voice {
  background: var(--df-chalk);
  padding: 1.3rem 1.2rem 1.1rem;
  border-left: 5px solid var(--df-brass);
}

.df-voice p {
  font-family: var(--df-display);
  font-size: 1.05rem;
  color: var(--df-ink);
}

.df-voice footer {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--df-ink-faint);
}

.df-clubmap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--df-pine);
  border: 1px solid var(--df-pine);
}

.df-clubmap a {
  background: var(--df-chalk);
  padding: 1.2rem 1rem;
  text-decoration: none;
  color: var(--df-ink);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 126px;
}

.df-clubmap a:hover { background: var(--df-white); }

.df-clubmap b {
  font-family: var(--df-mark);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--df-brick);
}

.df-clubmap span {
  font-family: var(--df-display);
  font-size: 1.12rem;
  color: var(--df-pine);
}

.df-folio {
  padding: 2.7rem 0 1.5rem;
  background:
    linear-gradient(180deg, var(--df-dust) 0, var(--df-dust) 72%, transparent 72%),
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 72px,
      rgba(196, 164, 90, 0.28) 72px,
      rgba(196, 164, 90, 0.28) 73px
    );
  border-bottom: 3px solid var(--df-pine);
}

.df-folio h1 { max-width: 18ch; }

.df-prose { max-width: 42rem; }

.df-prose h2 { margin-top: 1.55em; }

.df-sheet {
  background: var(--df-white);
  border: 1px solid rgba(30, 58, 42, 0.12);
  padding: 1.3rem 1.2rem 1.15rem;
  box-shadow: var(--df-shadow);
}

.df-sheet--board {
  background: var(--df-pine);
  color: var(--df-chalk);
  border-color: var(--df-pine);
}

.df-sheet--board h3 { color: var(--df-chalk); }

.df-sheet--board .df-sum { color: var(--df-brass); }

.df-sum {
  font-family: var(--df-display);
  font-size: 2.05rem;
  color: var(--df-brick-deep);
  margin: 0.15rem 0 0.55rem;
}

.df-sum small {
  font-size: 0.82rem;
  color: var(--df-ink-faint);
  letter-spacing: 0.04em;
}

.df-rate-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.df-plotters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.df-plotter {
  background: var(--df-chalk);
  padding: 1.4rem 1.2rem;
  border-bottom: 6px solid var(--df-pine);
}

.df-plotter__mark {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  background: var(--df-pine);
  color: var(--df-brass);
  font-family: var(--df-display);
  font-size: 1.05rem;
  margin-bottom: 0.9rem;
}

.df-plotter__role {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--df-brick);
  margin: 0 0 0.35rem;
}

.df-faq {
  max-width: 48rem;
}

.df-faq details {
  border-top: 1px solid rgba(30, 58, 42, 0.16);
  padding: 0.85rem 0;
}

.df-faq summary {
  cursor: pointer;
  font-family: var(--df-display);
  font-size: 1.12rem;
  color: var(--df-pine);
  list-style: none;
}

.df-faq summary::-webkit-details-marker { display: none; }

.df-faq summary::before {
  content: "▸";
  color: var(--df-brass-deep);
  margin-right: 0.45rem;
}

.df-faq details[open] summary::before { content: "▾"; }

.df-faq details p {
  margin: 0.6rem 0 0.2rem;
  color: var(--df-ink-soft);
}

.df-form {
  background: var(--df-chalk);
  border: 1px solid rgba(30, 58, 42, 0.14);
  padding: 1.4rem 1.25rem 1.3rem;
}

.df-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
}

.df-field { display: flex; flex-direction: column; gap: 0.35rem; }

.df-field--full { grid-column: 1 / -1; }

.df-field label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--df-ink-faint);
}

.df-field input,
.df-field select,
.df-field textarea {
  font: inherit;
  padding: 0.62rem 0.7rem;
  border: 1px solid rgba(30, 58, 42, 0.22);
  background: var(--df-white);
  color: var(--df-ink);
  width: 100%;
}

.df-field input:focus,
.df-field select:focus,
.df-field textarea:focus {
  outline: 2px solid var(--df-brass);
  outline-offset: 1px;
}

.df-form-note {
  font-size: 0.88rem;
  color: var(--df-ink-faint);
  margin: 0.9rem 0 0;
}

.df-check {
  list-style: none;
  padding: 0;
  margin: 0;
}

.df-check li {
  padding: 0.45rem 0 0.45rem 1.4rem;
  position: relative;
  border-bottom: 1px dashed rgba(30, 58, 42, 0.16);
}

.df-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 8px;
  height: 8px;
  background: var(--df-brass);
  transform: rotate(45deg);
}

.df-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.3rem;
}

.df-blog-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.df-blog-list a {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 18px;
  text-decoration: none;
  color: inherit;
  padding: 1.15rem 0;
  border-top: 1px solid rgba(30, 58, 42, 0.14);
}

.df-blog-list a:hover strong { color: var(--df-brick-deep); }

.df-blog-list time {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--df-brick);
  padding-top: 0.25rem;
}

.df-blog-list strong {
  font-family: var(--df-display);
  font-size: 1.22rem;
  color: var(--df-pine);
  font-weight: 600;
}

.df-article {
  max-width: 42rem;
}

.df-article h2 { margin-top: 1.7em; }

.df-lost {
  padding: 4.5rem 0 5rem;
  text-align: left;
}

.df-lost__code {
  font-family: var(--df-mark);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--df-brass-deep);
  margin: 0 0 0.6rem;
}

.df-hayfoot {
  background: var(--df-pine);
  color: var(--df-chalk);
  margin-top: 0;
}

.df-hayfoot a { color: var(--df-brass); }

.df-hayfoot a:hover { color: var(--df-chalk); }

.df-hayfoot h2 {
  color: var(--df-brass);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-family: var(--df-mark);
  font-weight: 600;
}

.df-hayfoot__rule {
  height: 8px;
  background:
    repeating-linear-gradient(
      90deg,
      var(--df-brick) 0 18px,
      var(--df-brass) 18px 22px,
      var(--df-pine-mid) 22px 40px
    );
}

.df-hayfoot__grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr 0.9fr 1fr;
  gap: 28px 24px;
  padding: 2.6rem 0 2.2rem;
}

.df-hayfoot__name {
  font-family: var(--df-display);
  font-size: 1.45rem;
  margin: 0 0 0.6rem;
}

.df-hayfoot__chips {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  font-size: 0.88rem;
}

.df-hayfoot__chips li {
  padding: 0.25rem 0;
  border-top: 1px dashed rgba(196, 164, 90, 0.3);
}

.df-clock {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.88rem;
}

.df-clock li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 0.28rem 0;
  border-bottom: 1px solid rgba(246, 241, 228, 0.1);
}

.df-clock li.is-dark { opacity: 0.55; }

.df-hayfoot__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.df-hayfoot__links li { margin: 0 0 0.35rem; }

.df-hayfoot__sill {
  border-top: 1px solid rgba(196, 164, 90, 0.25);
  padding: 0.9rem 0 1.1rem;
  font-size: 0.8rem;
  color: rgba(246, 241, 228, 0.75);
}

.df-hayfoot__sill-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.df-hayfoot__sill p { margin: 0; }

@media (max-width: 1120px) {
  .df-toggle { display: block; }

  .df-menu {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(88vw, 360px);
    background: var(--df-board);
    color: var(--df-chalk);
    flex-direction: column;
    align-items: stretch;
    padding: 5.5rem 1.4rem 2rem;
    transform: translateX(110%);
    transition: transform 0.24s ease;
    box-shadow: -18px 0 40px -20px rgba(0, 0, 0, 0.5);
  }

  .df-menu.is-open { transform: none; }

  .df-menu__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .df-menu__list a {
    color: var(--df-chalk);
    display: block;
    padding: 0.7rem 0;
    border-bottom: 1px solid rgba(196, 164, 90, 0.25);
    font-size: 1rem;
  }

  .df-menu__list .is-here a { color: var(--df-brass); }

  .df-hold { margin-top: 1.2rem; text-align: center; }
}

@media (max-width: 920px) {
  .df-splash__grid,
  .df-split,
  .df-split--flip,
  .df-split--even,
  .df-panes,
  .df-voices,
  .df-clubmap,
  .df-rate-grid,
  .df-plotters,
  .df-hayfoot__grid {
    grid-template-columns: 1fr;
  }

  .df-pane:nth-child(2),
  .df-pane:nth-child(3) { transform: none; }

  .df-clubmap { grid-template-columns: 1fr 1fr; }

  .df-blog-list a { grid-template-columns: 1fr; gap: 4px; }
}

@media (max-width: 640px) {
  .df-fields { grid-template-columns: 1fr; }

  .df-clubmap { grid-template-columns: 1fr; }

  .df-lintel { font-size: 0.62rem; }

  h1 { font-size: clamp(1.85rem, 9vw, 2.6rem); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .df-rise { opacity: 1; transform: none; }
}