@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@500;600&family=Manrope:wght@400;600;700;800&display=swap");

:root {
  color-scheme: light;
  --ink: #20262a;
  --muted: #657179;
  --line: #d8e0df;
  --paper: #fbfaf6;
  --panel: #ffffff;
  --sage: #dfe9df;
  --green: #195f4a;
  --green-dark: #0e3e32;
  --clay: #a95d45;
  --blue: #315f78;
  --gold: #d69b38;
  --shadow: 0 18px 50px rgba(32, 38, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: "Manrope", "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header,
.site-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--green);
  color: #fff;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

nav a {
  color: var(--muted);
  font-weight: 800;
  text-decoration: none;
}

.hero {
  max-width: 1180px;
  min-height: 340px;
  margin: 0 auto;
  padding: 40px 24px 34px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 370px;
  gap: 34px;
  align-items: center;
}

.hero > *,
.calculator-shell > *,
.letter-band > *,
.guide-grid > * {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--clay);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 760px;
  margin: 0 0 18px;
  font-size: clamp(2.8rem, 6.4vw, 5rem);
  line-height: 0.94;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(1.72rem, 3.6vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 24px 0 8px;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 690px;
  color: var(--muted);
  font-size: 1.16rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
}

.button-link,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 0;
  border-radius: 7px;
  background: var(--green-dark);
  color: #fff;
  font: inherit;
  font-weight: 850;
  text-decoration: none;
  cursor: pointer;
}

.button-link {
  padding: 0 20px;
}

.text-link {
  color: var(--green-dark);
  font-weight: 850;
}

.hero-panel {
  display: grid;
  gap: 12px;
}

.hero-panel div,
.input-panel,
.result-panel,
.letter-card,
.guide-grid article,
.faq-band details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.hero-panel div {
  padding: 18px;
}

.hero-panel strong,
.hero-panel span {
  display: block;
}

.hero-panel span {
  color: var(--muted);
}

.calculator-band {
  padding: 30px 24px 48px;
  background: var(--sage);
}

.calculator-shell {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(360px, 1fr) minmax(320px, 430px);
  gap: 18px;
  align-items: start;
}

.input-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 24px;
}

.panel-heading,
.option-group {
  grid-column: 1 / -1;
}

.field {
  display: grid;
  gap: 8px;
}

label,
legend {
  color: var(--ink);
  font-weight: 850;
}

.optional,
.hint {
  color: var(--muted);
  font-size: 0.9rem;
}

.hint {
  margin: 0;
}

input,
select {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

input:focus,
select:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(25, 95, 74, 0.22);
  outline-offset: 2px;
}

.option-group {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7faf7;
}

.option-group label {
  display: flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
}

.option-group input {
  width: 20px;
  min-height: 20px;
}

.result-panel {
  position: sticky;
  top: 16px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.date-hero {
  margin-bottom: 20px;
}

.date-hero span,
.date-hero em {
  display: block;
  color: var(--muted);
  font-style: normal;
  font-weight: 750;
}

.date-hero strong {
  display: block;
  margin: 8px 0;
  color: var(--green-dark);
  font-size: clamp(2rem, 5vw, 3.15rem);
  line-height: 1;
  letter-spacing: 0;
  font-family: "IBM Plex Mono", "Manrope", sans-serif;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric-grid div {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #f8faf8;
}

.metric-grid span {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.metric-grid strong {
  display: block;
  font-family: "IBM Plex Mono", "Manrope", sans-serif;
  font-size: 1rem;
}

button {
  width: 100%;
  margin-top: 16px;
}

.copy-status {
  min-height: 24px;
  margin: 10px 0 0;
  color: var(--green-dark);
  font-weight: 800;
}

.letter-band,
.guide-grid,
.faq-band {
  max-width: 1180px;
  margin: 0 auto;
  padding: 52px 24px;
}

.letter-band {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(360px, 1.18fr);
  gap: 28px;
  align-items: start;
}

.letter-band p {
  color: var(--muted);
}

.letter-card {
  padding: 22px;
}

pre {
  min-height: 220px;
  margin: 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #f8faf8;
  color: var(--ink);
  white-space: pre-wrap;
  font: 0.98rem/1.6 "Manrope", "Segoe UI", sans-serif;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  padding-top: 18px;
}

.guide-grid article {
  padding: 25px;
}

.faq-band {
  max-width: 920px;
  padding-top: 12px;
}

.faq-band details {
  margin-top: 12px;
  padding: 18px 20px;
}

summary {
  cursor: pointer;
  font-weight: 850;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 24px 76px;
}

.page h1 {
  font-size: clamp(2.35rem, 6vw, 4rem);
}

@media (max-width: 900px) {
  .hero,
  .calculator-shell,
  .letter-band,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .result-panel {
    position: static;
  }
}

@media (max-width: 680px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header nav,
  .site-footer nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, max-content));
    gap: 10px 18px;
  }

  .hero {
    min-height: auto;
    padding-top: 34px;
  }

  .hero-copy,
  .hero-copy > p:not(.eyebrow) {
    max-width: min(100%, 342px);
  }

  h1 {
    font-size: clamp(2.3rem, 10.2vw, 2.85rem);
    line-height: 1.02;
  }

  h2 {
    font-size: clamp(1.55rem, 7.2vw, 2rem);
  }

  .input-panel,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .panel-heading,
  .option-group {
    grid-column: auto;
  }

  .calculator-band {
    padding-inline: 14px;
  }

  .letter-band,
  .guide-grid,
  .faq-band {
    padding-inline: 14px;
  }
}