/* Try Rule — chalk bench · rosewood stock · brass square */
:root {
  --blade: #B8C0C8;
  --rosewood: #5C2E2E;
  --brass: #C9A227;
  --chalk: #E8E4DC;
  --ink: #1A1F24;
  --true: #2E5A45;
  --chalk-deep: #D9D3C7;
  --chalk-lift: #F3F0E8;
  --ink-soft: rgba(26, 31, 36, 0.68);
  --line: rgba(26, 31, 36, 0.14);
  --font-display: "Young Serif", "Palatino Linotype", Palatino, serif;
  --font-body: "Public Sans", "Segoe UI", sans-serif;
  --font-mono: "Fragment Mono", "Courier New", monospace;
  --wrap: 68rem;
  --narrow: 40rem;
  --ease: cubic-bezier(0.33, 0.05, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  background:
    radial-gradient(ellipse 90% 55% at 12% -10%, rgba(201, 162, 39, 0.12), transparent 55%),
    radial-gradient(ellipse 70% 45% at 100% 8%, rgba(92, 46, 46, 0.08), transparent 50%),
    linear-gradient(180deg, var(--chalk-lift) 0%, var(--chalk) 42%, var(--chalk-deep) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

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

a {
  color: var(--rosewood);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.2s var(--ease);
}

a:hover { color: var(--true); }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--chalk);
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip:focus { left: 0.75rem; top: 0.75rem; }

.wrap {
  width: min(100% - 2rem, var(--wrap));
  margin-inline: auto;
}

.wrap.narrow { width: min(100% - 2rem, var(--narrow)); }

/* —— Header —— */
.top {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--chalk-lift) 88%, transparent);
  border-bottom: 1px solid var(--line);
}

.top__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.brand:hover { color: var(--rosewood); }

.brand__mark {
  width: 1.7rem;
  height: 1.7rem;
  flex-shrink: 0;
}

.nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.nav a:hover { color: var(--rosewood); }

/* —— Labels —— */
.rule-label {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--true);
}

/* —— Hero —— */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  min-height: min(92vh, 52rem);
  display: flex;
  align-items: stretch;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 47px,
      rgba(26, 31, 36, 0.035) 47px,
      rgba(26, 31, 36, 0.035) 48px
    );
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.55), transparent 85%);
}

.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  padding: clamp(2.5rem, 8vh, 5rem) 0 clamp(2rem, 5vh, 3.5rem);
  width: min(100% - 2rem, var(--wrap));
  margin-inline: auto;
}

.hero h1 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(3rem, 8vw, 5.4rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.hero__headline {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  line-height: 1.25;
  color: var(--rosewood);
  max-width: 22ch;
}

.hero__lead {
  margin: 0 0 1.75rem;
  max-width: 36ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}

.hero__art {
  margin: 0;
  position: relative;
}

.hero__art svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 18px 40px rgba(26, 31, 36, 0.12));
}

.square-arm {
  transform-origin: 118px 248px;
  animation: square-check 5.5s var(--ease) infinite;
}

@keyframes square-check {
  0%, 100% { transform: rotate(0deg); }
  40% { transform: rotate(-3.2deg); }
  55% { transform: rotate(-2.6deg); }
  70% { transform: rotate(0.4deg); }
}

@media (prefers-reduced-motion: reduce) {
  .square-arm { animation: none; }
  html { scroll-behavior: auto; }
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.72rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--chalk-lift);
  background: var(--rosewood);
  border: 1px solid var(--rosewood);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--chalk-lift);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: color-mix(in srgb, var(--ink) 35%, transparent);
}

.btn--ghost:hover {
  background: var(--ink);
  color: var(--chalk-lift);
  border-color: var(--ink);
}

/* —— Sections —— */
.section {
  padding: clamp(2.75rem, 6vw, 4.5rem) 0;
}

.section > h2,
.band h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  letter-spacing: -0.015em;
}

.band {
  padding: clamp(2.5rem, 5vw, 3.75rem) 0;
  background:
    linear-gradient(180deg, rgba(184, 192, 200, 0.28), rgba(232, 228, 220, 0.4));
  border-block: 1px solid var(--line);
}

.bench {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.bench__step {
  padding-top: 0.85rem;
  border-top: 2px solid var(--brass);
}

.bench__n {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rosewood);
}

.bench__step h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.35rem;
}

.bench__step p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* —— Library (no card chrome) —— */
.library {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.mark-row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.mark-row__n {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brass);
  padding-top: 0.35rem;
}

.mark-row h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.35rem;
}

.mark-row h3 a {
  color: var(--ink);
  text-decoration: none;
}

.mark-row h3 a:hover { color: var(--rosewood); }

.mark-row p {
  margin: 0 0 0.55rem;
  color: var(--ink-soft);
}

.mark-row__more {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--true);
}

.mark-row__more:hover { color: var(--rosewood); }

/* —— Lists —— */
.standards,
.not-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.standards li,
.not-list li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--ink-soft);
}

.standards li::before,
.not-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--true);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.not-list li::before { background: var(--rosewood); }

/* —— FAQ —— */
.faq {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}

.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.15rem;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  font-family: var(--font-mono);
  color: var(--brass);
}

.faq details[open] summary::after { content: "−"; }

.faq details p {
  margin: 0.65rem 0 0.25rem;
  color: var(--ink-soft);
}

.support-block {
  padding-top: 0.5rem;
  border-top: 2px solid var(--brass);
}

.support-block h2 { margin-top: 1rem; }

.support-block p { color: var(--ink-soft); }

/* —— Inner pages —— */
.pagehead {
  padding: clamp(2.25rem, 5vw, 3.5rem) 0 1.25rem;
  border-bottom: 1px solid var(--line);
}

.pagehead h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.pagehead__intro {
  margin: 0;
  color: var(--ink-soft);
  max-width: 40ch;
}

.paper {
  padding: clamp(1.75rem, 4vw, 2.75rem) 0 clamp(3rem, 6vw, 4.5rem);
}

.prose h2 {
  margin: 2rem 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.45rem;
}

.prose p { margin: 0 0 1rem; color: var(--ink-soft); }
.prose p:first-child { color: var(--ink); }

.prose ul {
  margin: 0 0 1.15rem;
  padding-left: 1.15rem;
  color: var(--ink-soft);
}

.prose li { margin-bottom: 0.4rem; }

.prose .note {
  margin-top: 1.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* —— Footer —— */
.foot {
  background: var(--ink);
  color: color-mix(in srgb, var(--chalk) 78%, transparent);
  padding: 2.75rem 0 1.75rem;
}

.foot a { color: var(--blade); }
.foot a:hover { color: var(--brass); }

.foot__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid rgba(184, 192, 200, 0.18);
}

.foot__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--chalk);
}

.foot__lead {
  margin: 0;
  max-width: 36ch;
  color: color-mix(in srgb, var(--blade) 85%, transparent);
  font-size: 0.95rem;
}

.foot__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.15rem;
  align-content: start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.foot__nav a { text-decoration: none; }

.foot__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-top: 1.25rem;
  font-size: 0.85rem;
  color: color-mix(in srgb, var(--blade) 70%, transparent);
}

.foot__base p { margin: 0; }

/* —— Responsive —— */
@media (max-width: 860px) {
  .hero__grid {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2rem;
  }

  .hero {
    min-height: auto;
  }

  .hero__art {
    order: -1;
    max-width: 26rem;
    margin-inline: auto;
  }

  .bench {
    grid-template-columns: 1fr;
  }

  .mark-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .foot__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .nav { gap: 0.85rem; }
  .hero h1 { font-size: clamp(2.6rem, 14vw, 3.4rem); }
}