/* The Brew Calculator v1 — mobile-first, no frameworks. Warm coffee palette. */
:root {
  --bg: #faf6ef;
  --surface: #ffffff;
  --ink: #2b2118;
  --muted: #6f5f4e;
  --accent: #a0622d;
  --accent-dark: #7d4c20;
  --line: #e7dccb;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 1.1rem; }

/* Header */
.site-header {
  background: var(--ink);
  color: #fff;
  padding: 0.7rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 960px;
}
.brand {
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
  text-decoration: none;
  letter-spacing: -0.02em;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.brand-logo { width: 34px; height: 34px; border-radius: 8px; }
.brand span { color: #e0a458; }
.site-header nav {
  display: flex;
  gap: 0.15rem;
  overflow-x: auto;
  margin-left: auto;
  -webkit-overflow-scrolling: touch;
}
.site-header nav a {
  color: #f3e7d3;
  text-decoration: none;
  font-size: 0.92rem;
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  white-space: nowrap;
}
.site-header nav a:hover { background: rgba(255,255,255,0.12); }

/* Hero */
.hero {
  background: linear-gradient(160deg, #3a2c1e, #241a10);
  color: #f7efe1;
  padding: 2.6rem 0 2.2rem;
}
.hero h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 0.7rem; letter-spacing: -0.02em; }
.hero p { color: #d9c8ab; margin: 0; max-width: 34rem; }

/* Tool cards */
.tool-grid {
  display: grid;
  gap: 1rem;
  margin: 1.6rem 0;
}
@media (min-width: 640px) { .tool-grid { grid-template-columns: repeat(3, 1fr); } }
.tool-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  text-decoration: none;
  color: inherit;
  display: block;
}
.tool-card:hover { border-color: var(--accent); box-shadow: 0 4px 18px rgba(160,98,45,0.12); }
.tool-card h2, .tool-card h3 { margin: 0 0 0.4rem; font-size: 1.12rem; }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.tool-card .cta { color: var(--accent); font-weight: 700; font-size: 0.95rem; }

/* Calculator */
.calculator {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  margin: 1.4rem 0 2rem;
}
.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 700; margin-bottom: 0.35rem; font-size: 0.98rem; }
.field input[type="number"], .field select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  font-size: 1.05rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
.field-row { display: grid; gap: 1rem; }
@media (min-width: 560px) { .field-row { grid-template-columns: 1fr 1fr; } }
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.4rem;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
}
.btn:hover { background: var(--accent-dark); }
.result {
  margin-top: 1.2rem;
  background: #f4ecdd;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  display: none;
}
.result.show { display: block; }
.result .big { font-size: 1.7rem; font-weight: 800; color: var(--accent-dark); }
.result .sub { color: var(--muted); font-size: 0.95rem; }
.error { color: #a33b2e; font-weight: 600; }

/* Content */
main { padding: 1.6rem 0 2.5rem; }
main h1 { font-size: 1.75rem; line-height: 1.3; letter-spacing: -0.015em; }
main h2 { font-size: 1.35rem; margin-top: 2rem; }
main h3 { font-size: 1.1rem; }
table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.95rem; }
th, td { text-align: left; padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--line); }
th { background: #f4ecdd; }
.tip {
  background: #f4ecdd;
  border-left: 4px solid var(--accent);
  padding: 0.9rem 1.1rem;
  border-radius: 0 8px 8px 0;
  margin: 1.2rem 0;
}
a { color: var(--accent-dark); }
.related { margin-top: 2.2rem; }
.related ul { padding-left: 1.2rem; }

/* Newsletter */
.newsletter {
  background: var(--ink);
  color: #f3e7d3;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2.2rem 0;
}
.newsletter h2 { margin: 0 0 0.4rem; color: #fff; font-size: 1.25rem; }
.newsletter p { margin: 0 0 0.9rem; color: #d9c8ab; font-size: 0.97rem; }
.newsletter-form { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.newsletter-form input[type="email"] {
  flex: 1 1 200px;
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  border: 1px solid #5a4a38;
  font-size: 1rem;
}
.newsletter-form button {
  background: #e0a458;
  color: #241a10;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1.2rem;
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
}
.newsletter-form button:hover { background: #f0bc77; }
.nl-note { font-size: 0.85rem; color: #b9a687; margin: 0.6rem 0 0; }
.nl-msg { font-weight: 700; color: #e0a458; }
.promo {
  background: linear-gradient(135deg, #3a2413 0%, #241a10 100%);
  border: 1px solid #6b4e2e;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2.2rem 0;
  color: #f3e7d3;
}
.promo h2 { margin: 0 0 0.4rem; color: #fff; font-size: 1.25rem; }
.promo p { margin: 0 0 1rem; color: #d9c8ab; font-size: 0.97rem; }
.promo p:last-child { margin-bottom: 0; }
.promo .btn {
  display: inline-block;
  background: #e0a458;
  color: #241a10;
  border-radius: 8px;
  padding: 0.65rem 1.2rem;
  font-weight: 800;
  font-size: 1rem;
  text-decoration: none;
}
.promo .btn:hover { background: #f0bc77; }
.promo-strip {
  background: #f3e7d3;
  border: 1px solid #e0cba4;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.8rem 0 0;
  font-size: 0.97rem;
  color: #4a3a26;
}
.promo-strip strong { color: #241a10; }
.promo-strip a { color: #8a5a1e; font-weight: 700; }

/* Footer */
.site-footer {
  background: var(--ink);
  color: #b9a687;
  padding: 2rem 0;
  font-size: 0.92rem;
}
.site-footer .wrap { max-width: 960px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; margin-bottom: 1rem; }
.site-footer a { color: #f3e7d3; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

/* Mobile: header nav gets its own row instead of trimming */
@media (max-width: 640px) {
  .site-header .wrap { flex-wrap: wrap; gap: 0.4rem 1rem; }
  .site-header nav { margin-left: 0; width: 100%; padding-bottom: 0.25rem; }
  .site-header nav a { font-size: 0.85rem; padding: 0.4rem 0.55rem; }
}