:root {
  color-scheme: light;
  --ink: #18201f;
  --muted: #5d6765;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --line: #ded8cc;
  --accent: #0f766e;
  --accent-2: #9a3412;
  --gold: #c88b2f;
  --soft: #eef5f3;
  --shadow: 0 18px 50px rgba(30, 35, 32, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(222, 216, 204, 0.9);
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border-radius: 0.45rem;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.8rem;
  letter-spacing: 0;
}

nav {
  display: flex;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  color: var(--muted);
  font-size: 0.95rem;
}

nav a {
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  color: var(--accent);
}

main {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.tool-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1.5rem;
  align-items: start;
  padding: clamp(2rem, 5vw, 4.75rem) 0 2rem;
}

.intro {
  grid-column: 1 / 2;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.35rem, 7vw, 5.7rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.lede {
  max-width: 720px;
  margin: 1.2rem 0 1.25rem;
  color: var(--muted);
  font-size: clamp(1.02rem, 2vw, 1.25rem);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.trust-row span {
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: var(--panel);
  font-weight: 700;
  font-size: 0.9rem;
}

.ad-slot {
  display: grid;
  min-height: 120px;
  place-items: center;
  padding: 1rem;
  border: 1px dashed #b8afa1;
  border-radius: 0.5rem;
  background: #f4efe6;
  color: #766b5c;
  text-align: center;
  font-size: 0.86rem;
}

.ad-slot-top {
  position: sticky;
  top: 5rem;
  min-height: 280px;
}

.ad-slot.is-viewable {
  border-color: var(--gold);
  background: #fff7e8;
}

.calculator {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.85fr);
  gap: 1rem;
  align-items: stretch;
  margin-top: 0.5rem;
}

.field-grid,
.result-panel,
.side-note {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  padding: 1rem;
}

label {
  display: grid;
  gap: 0.4rem;
  color: #394240;
  font-weight: 750;
  font-size: 0.92rem;
}

input,
select {
  width: 100%;
  min-height: 2.85rem;
  border: 1px solid #cfc8bb;
  border-radius: 0.4rem;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

input:focus,
select:focus {
  outline: 3px solid rgba(15, 118, 110, 0.18);
  border-color: var(--accent);
}

.money-input {
  display: flex;
  align-items: center;
  overflow: hidden;
  border: 1px solid #cfc8bb;
  border-radius: 0.4rem;
  background: #fff;
}

.money-input span {
  padding-inline: 0.8rem;
  color: var(--muted);
  font-weight: 800;
}

.money-input input {
  border: 0;
  border-radius: 0;
}

.range-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 4rem;
  gap: 0.65rem;
  align-items: center;
}

output {
  color: var(--accent);
  font-weight: 900;
  text-align: right;
}

.result-panel {
  display: grid;
  grid-template-rows: auto minmax(180px, 1fr);
  gap: 0.75rem;
  padding: 1rem;
  background: var(--soft);
}

.range-value {
  margin: 0;
  color: var(--accent);
  font-size: clamp(1.8rem, 4vw, 3.1rem);
  font-weight: 900;
  line-height: 1.05;
}

.result-note {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

canvas {
  width: 100%;
  height: auto;
  min-height: 180px;
  border-radius: 0.4rem;
  background: #ffffff;
}

.content-band {
  margin: 1.2rem 0;
  padding: clamp(1.5rem, 4vw, 3rem) 0;
  border-top: 1px solid var(--line);
}

.content-band h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  line-height: 1.05;
}

.page-shell {
  display: grid;
  gap: 1.4rem;
  width: min(860px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4rem) 0;
}

.page-shell h1 {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
}

.page-section {
  padding: 1.2rem 0;
  border-top: 1px solid var(--line);
}

.page-section h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.35rem, 2.5vw, 2rem);
}

.page-section p,
.page-section li {
  color: var(--muted);
}

.page-section a {
  color: var(--accent);
  font-weight: 750;
}

.contact-list {
  display: grid;
  gap: 0.55rem;
  padding-left: 1.2rem;
}

.explain p,
.content-band li,
details p,
.side-note p {
  color: var(--muted);
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.method-grid div {
  min-height: 150px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
}

.method-grid h3 {
  margin: 0 0 0.5rem;
  font-size: 1.03rem;
}

.method-grid p {
  margin: 0;
  font-size: 0.95rem;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1rem;
}

.check-list {
  display: grid;
  gap: 0.65rem;
  padding-left: 1.2rem;
}

.side-note {
  align-self: start;
  padding: 1.1rem;
  background: #fff7e8;
  box-shadow: none;
}

details {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}

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

footer {
  margin-top: 2rem;
  padding: 2rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
  font-size: 0.92rem;
}

footer p {
  margin: 0.25rem 0;
}

.footer-links {
  justify-content: center;
  margin-bottom: 0.9rem;
  color: var(--ink);
  font-weight: 750;
}

@media (max-width: 900px) {
  .tool-shell,
  .calculator,
  .split {
    grid-template-columns: 1fr;
  }

  .ad-slot-top {
    position: static;
    min-height: 110px;
  }

  .method-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .field-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(2.2rem, 16vw, 3.6rem);
  }
}