/* Furnace Filter Buddy — shared styles. Keep this file when adding a nightly page. */
:root {
  --bg: #f7f3ec;
  --surface: #fffdf9;
  --ink: #1b2430;
  --muted: #5a6270;
  --accent: #e56b12;
  --accent-dark: #b34e0c;
  --line: #e4dcd0;
  --navy: #002041;
  --th-bg: #f3eee6;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  font-size: 1.0625rem;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--navy);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 10;
}

.skip:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--navy);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.brand:hover {
  color: var(--accent-dark);
  text-decoration: none;
}

.brand img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: block;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.1rem;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.95rem;
}

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

.site-nav a[aria-current="page"] {
  font-weight: 600;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}

h1 {
  font-size: clamp(1.75rem, 3.2vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  color: var(--navy);
  font-weight: 700;
}

h2 {
  margin: 2.4rem 0 0.85rem;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  color: var(--navy);
  font-weight: 700;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

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

ul,
ol {
  margin: 0 0 1.15rem;
  padding-left: 1.25rem;
}

li {
  margin: 0.3rem 0;
}

.wrap {
  overflow-x: auto;
  margin: 0 0 1.15rem;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--surface);
}

th,
td {
  border: 1px solid var(--line);
  padding: 0.55rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--th-bg);
  font-weight: 600;
  color: var(--navy);
}

.note {
  background: #fff4e6;
  padding: 0.85rem 1.05rem;
  border-left: 3px solid var(--accent);
  margin: 0 0 1.25rem;
}

.note > :last-child {
  margin-bottom: 0;
}

.buy-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12.5rem, 1fr));
  gap: 0.6rem;
}

.buy-list a {
  display: block;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  color: var(--navy);
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--surface);
}

.buy-list a:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.shop-note {
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 3rem;
  font-size: 0.88rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  line-height: 1.6;
}

.site-footer p {
  margin: 0 0 0.5rem;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: #efe8dc;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

@media (max-width: 540px) {
  .brand img {
    width: 48px;
    height: 48px;
  }

  .header-inner {
    padding: 0.75rem 1rem;
  }

  main {
    padding: 1.75rem 1rem 2.5rem;
  }

  .site-nav a {
    padding: 0.3rem 0.45rem;
  }

  .site-footer {
    padding: 1.5rem 1rem 2.5rem;
  }
}