:root {
  --ink: #10253a;
  --ink-soft: #2b4358;
  --sand: #f4efe5;
  --paper: #fffdf8;
  --line: #ddd3c3;
  --accent: #c28b43;
  --accent-deep: #9a6d31;
  --ok: #1b7749;
  --bad: #9f2a2a;
  --maxw: 1120px;
  --shadow: 0 18px 40px rgba(16, 37, 58, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Manrope", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: radial-gradient(1000px 480px at 100% -120px, #e7dcc8 0%, transparent 62%), var(--sand);
  line-height: 1.65;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .6rem; }
p { margin: .4rem 0 1rem; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(16, 37, 58, .11);
  background: #fff;
  backdrop-filter: blur(10px);
}

.nav {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .8rem;
}

.brand img {
  width: 220px;
  height: auto;
  object-fit: contain;
}

.brand-mark {
  font-size: .86rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink-soft);
}

.site-nav {
  display: flex;
  gap: .15rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a {
  color: var(--ink-soft);
  padding: .58rem .78rem;
  border-radius: 999px;
  font-weight: 700;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  outline: none;
  background: #efe5d5;
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: .76rem 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform .08s ease, background .2s ease, color .2s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(140deg, var(--accent), #d49d55);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-deep);
  color: #fff;
  outline: none;
}

.btn-secondary {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  outline: none;
  border-color: var(--accent);
  color: var(--accent-deep);
}

.hero {
  padding: 2.6rem 0 1.7rem;
}

.hero-shell {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: clamp(1.2rem, 3vw, 2rem);
}

.kicker {
  display: inline-block;
  border-radius: 999px;
  border: 1px solid #e7dbc8;
  background: #f8f2e8;
  color: #7a5322;
  font-size: .82rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 800;
  padding: .3rem .72rem;
  margin-bottom: .7rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 5vw, 3rem);
  margin-bottom: .6rem;
}

.hero p {
  max-width: 74ch;
  color: var(--ink-soft);
}

.grid {
  display: grid;
  gap: 1rem;
}

.cards-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.1rem;
  box-shadow: 0 10px 22px rgba(16, 37, 58, 0.07);
}

.card h3 {
  font-size: 1.14rem;
  margin-bottom: .35rem;
}

.card p,
.meta,
.list {
  color: var(--ink-soft);
}

.meta {
  font-size: .88rem;
}

.section {
  padding: 1.2rem 0 2rem;
}

.section h2 {
  font-size: clamp(1.45rem, 4vw, 2rem);
}

.article {
  padding: 2rem 0 2.5rem;
}

.article-shell {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: clamp(1.2rem, 3vw, 2rem);
}

.article h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
}

.article h2 {
  font-size: clamp(1.2rem, 3vw, 1.65rem);
  margin-top: 1.3rem;
}

.article ul,
.article ol {
  padding-left: 1.2rem;
}

.callout {
  border-left: 4px solid var(--accent);
  background: #f9f3e8;
  border-radius: 10px;
  padding: .8rem .9rem;
  margin: .8rem 0 1rem;
}

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

.calc {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: 1.2rem;
}

.field {
  display: grid;
  gap: .3rem;
  margin-bottom: .8rem;
}

.field label {
  font-size: .92rem;
  font-weight: 700;
  color: #1a354d;
}

.field input,
.field select {
  width: 100%;
  border: 1px solid #cfc2b0;
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: .72rem .76rem;
  font: inherit;
}

.field input:focus,
.field select:focus {
  outline: 2px solid #d8ac6d;
  outline-offset: 1px;
  border-color: #d8ac6d;
}

.calc-result {
  margin-top: .8rem;
  border: 1px dashed #d4be97;
  border-radius: 12px;
  background: #f8f1e4;
  padding: .8rem;
}

.calc-result strong {
  font-size: 1.45rem;
}

.result-ok { color: var(--ok); }
.result-bad { color: var(--bad); }

.note {
  font-size: .87rem;
  color: var(--ink-soft);
}

footer {
  margin-top: 2rem;
  border-top: 1px solid #d6cab8;
  background: #10253a;
  color: #deebf7;
  padding: 1.8rem 0 1.2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1rem;
}

.footer-brand img {
  width: 210px;
  margin-bottom: .6rem;
}

.footer-links a {
  display: inline-flex;
  margin: 0 .7rem .5rem 0;
  color: #f4f8fd;
  font-weight: 700;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #f7c785;
  outline: none;
}

.small {
  font-size: .85rem;
  color: #c4d8ea;
}

@media (max-width: 980px) {
  .cards-3,
  .cards-2,
  .tools-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    padding-bottom: .8rem;
  }

  .nav {
    flex-wrap: wrap;
    padding: .6rem 0;
  }

  .brand-mark { display: none; }
}