@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght,SOFT,WONK@9..144,300..900,0..100,0..1&family=Inter+Tight:wght@400;500;600&display=swap');

:root {
  --bg: #F4EFE6;
  --bg-soft: #ECE4D2;
  --ink: #1A1714;
  --ink-soft: #4A433C;
  --ink-faint: #8A8076;
  --accent: #7A1F1F;
  --accent-soft: rgba(122, 31, 31, 0.08);
  --rule: rgba(26, 23, 20, 0.14);
  --rule-strong: rgba(26, 23, 20, 0.45);
  --max: 76rem;
  --pad: clamp(1.25rem, 4vw, 3rem);

  --font-display: 'Fraunces', 'Times New Roman', serif;
  --font-body: 'Inter Tight', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  font-feature-settings: "ss01", "cv01";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(122, 31, 31, 0.025), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 100%, rgba(26, 23, 20, 0.04), transparent 60%);
  background-attachment: fixed;
}

::selection { background: var(--accent); color: var(--bg); }

a { color: inherit; text-decoration: none; }

/* ── Header ───────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--rule);
  padding: 1.5rem var(--pad) 1.25rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 2rem;
  max-width: var(--max);
  margin: 0 auto;
}

.site-header__brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  font-variation-settings: "opsz" 24, "SOFT" 50;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
}

.site-header__brand-mark {
  color: var(--accent);
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
}

.site-nav {
  display: flex;
  gap: 1.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 500;
}

.site-nav a {
  position: relative;
  padding-bottom: 0.15rem;
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right 220ms ease;
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after { right: 0; }

.site-nav a[aria-current="page"] { color: var(--accent); }

/* ── Layout shells ────────────────────────────────── */

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) var(--pad) 4rem;
}

.prose {
  max-width: 38rem;
}

.prose p { margin: 0 0 1.1rem; color: var(--ink-soft); font-size: 1.05rem; line-height: 1.7; }
.prose p:first-of-type::first-letter {
  font-family: var(--font-display);
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
  font-size: 4.5rem;
  line-height: 0.85;
  float: left;
  margin: 0.4rem 0.6rem -0.3rem 0;
  color: var(--accent);
  font-weight: 500;
}
.prose h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-variation-settings: "opsz" 36, "SOFT" 50;
  font-size: 1.8rem;
  letter-spacing: -0.015em;
  margin: 2.5rem 0 0.9rem;
  color: var(--ink);
}
.prose h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 2rem 0 0.6rem;
}
.prose ul { padding-left: 1.1rem; color: var(--ink-soft); }
.prose li { margin-bottom: 0.4rem; line-height: 1.65; }
.prose a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
  transition: border-color 200ms;
}
.prose a:hover { border-bottom-color: var(--accent); }

/* ── Hero (converter page) ────────────────────────── */

.hero {
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--rule);
}

.hero__eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  opacity: 0;
  animation: fadeUp 700ms 0ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 2.2rem;
  height: 1px;
  background: var(--rule-strong);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
  font-size: clamp(3.4rem, 9vw, 7.5rem);
  line-height: 0.92;
  letter-spacing: -0.035em;
  margin: 0 0 1.25rem;
  color: var(--ink);
  opacity: 0;
  animation: fadeUp 800ms 80ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.hero__title em {
  font-style: italic;
  color: var(--accent);
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
}

.hero__lede {
  font-family: var(--font-display);
  font-weight: 300;
  font-variation-settings: "opsz" 36, "SOFT" 30;
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  line-height: 1.45;
  color: var(--ink-soft);
  max-width: 36rem;
  font-style: italic;
  opacity: 0;
  animation: fadeUp 800ms 160ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

/* ── Converter ────────────────────────────────────── */

.converter {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: end;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 800ms 240ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-width: 0;
}

.field__label {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.field__label-side {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-variation-settings: "opsz" 14, "SOFT" 50;
  font-size: 0.85rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-faint);
}

.field__input {
  appearance: none;
  border: none;
  background: transparent;
  border-bottom: 1px solid var(--rule-strong);
  padding: 0.5rem 0 0.7rem;
  font-family: var(--font-display);
  font-variation-settings: "opsz" 96, "SOFT" 100, "WONK" 1;
  font-weight: 400;
  font-size: clamp(2.8rem, 7vw, 4.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  width: 100%;
  outline: none;
  transition: border-color 200ms ease, border-bottom-width 200ms ease;
  font-feature-settings: "lnum", "tnum";
  caret-color: var(--accent);
}

.field__input::placeholder {
  color: var(--ink-faint);
  opacity: 0.45;
  font-style: italic;
}

.field__input:focus {
  border-bottom: 2px solid var(--accent);
  padding-bottom: calc(0.7rem - 1px);
}

.field__input.flash {
  animation: pulse 360ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.field__hint {
  font-size: 0.82rem;
  color: var(--accent);
  min-height: 1.2em;
  font-style: italic;
  font-family: var(--font-display);
  font-variation-settings: "opsz" 14, "SOFT" 50;
  letter-spacing: 0.005em;
}

.swap {
  appearance: none;
  background: transparent;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--ink-soft);
  font-size: 1.1rem;
  margin-bottom: 1.4rem;
  transition: color 200ms, border-color 200ms, background 200ms, transform 300ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.swap:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: rotate(180deg);
}

.swap:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── How it works ─────────────────────────────────── */

.howto {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem 2rem;
  border-top: 1px solid var(--rule);
  padding-top: 2rem;
  margin-top: 3rem;
  opacity: 0;
  animation: fadeUp 800ms 360ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.howto__item {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.howto__num {
  font-family: var(--font-display);
  font-style: italic;
  font-variation-settings: "opsz" 36, "SOFT" 100;
  font-size: 1.3rem;
  color: var(--accent);
}

.howto__label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}

.howto__body {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

/* ── Page titles (non-home) ───────────────────────── */

.page-head {
  margin-bottom: 3rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--rule);
}

.page-head__eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
  margin-bottom: 1rem;
}

.page-head__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin: 0;
}

.page-head__title em {
  font-style: italic;
  color: var(--accent);
}

/* ── Chart ────────────────────────────────────────── */

.chart {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0 3rem;
  margin: 2rem 0 3rem;
}

.chart__group {
  break-inside: avoid;
  margin-bottom: 2.5rem;
}

.chart__group-label {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0.75rem;
}

.chart__row {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  align-items: baseline;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--rule);
  font-feature-settings: "lnum", "tnum";
}

.chart__row:last-child { border-bottom: none; }

.chart__num {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.chart__roman {
  font-family: var(--font-display);
  font-variation-settings: "opsz" 24, "SOFT" 100, "WONK" 1;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: 0.01em;
}

/* ── Ad slot ──────────────────────────────────────── */

.ad-slot {
  margin: 3.5rem 0;
  padding: 2rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  min-height: 9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.ad-slot::before {
  content: 'Advertisement';
  position: absolute;
  top: -0.5rem;
  left: 0;
  background: var(--bg);
  padding: 0 0.6rem;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.ad-slot__inner {
  width: 100%;
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-faint);
  font-style: italic;
  font-family: var(--font-display);
  font-variation-settings: "opsz" 14;
  font-size: 0.85rem;
}

/* ── Footer ───────────────────────────────────────── */

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem var(--pad) 3rem;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: baseline;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.site-footer__brand {
  font-family: var(--font-display);
  font-style: italic;
  font-variation-settings: "opsz" 24, "SOFT" 60;
  color: var(--ink-soft);
}

.site-footer__links {
  display: flex;
  gap: 1.5rem;
}

.site-footer__links a:hover { color: var(--accent); }

/* ── 404 ──────────────────────────────────────────── */

.notfound {
  text-align: center;
  padding: 6rem 1rem;
}

.notfound__num {
  font-family: var(--font-display);
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
  font-size: clamp(6rem, 18vw, 14rem);
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.notfound__msg {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--ink-soft);
  margin-bottom: 2rem;
}

.notfound__back {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 0.2rem;
}

/* ── Animations ───────────────────────────────────── */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(0.6rem); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.025); }
  100% { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero__eyebrow, .hero__title, .hero__lede, .converter, .howto { opacity: 1; }
}

/* ── Responsive ───────────────────────────────────── */

@media (max-width: 720px) {
  .site-header { grid-template-columns: 1fr; gap: 0.75rem; }
  .site-nav { gap: 1.25rem; font-size: 0.72rem; }

  .converter {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .swap {
    transform: rotate(90deg);
    margin: 0 auto;
  }
  .swap:hover { transform: rotate(270deg); }

  .howto { grid-template-columns: 1fr 1fr; gap: 1.5rem; }

  .site-footer { grid-template-columns: 1fr; gap: 1.25rem; }
  .site-footer__links { flex-wrap: wrap; gap: 1rem; }
}

@media (max-width: 480px) {
  .howto { grid-template-columns: 1fr; }
}