/* ============================================
   OZ TO GALLON — Global Stylesheet
   Design: Clean editorial utility aesthetic
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,600;0,9..144,800;1,9..144,300&family=DM+Sans:wght@300;400;500;600&display=swap');

:root {
  --color-bg: #fafaf7;
  --color-surface: #ffffff;
  --color-primary: #1a472a;
  --color-primary-light: #2d6a4f;
  --color-accent: #e8f5e1;
  --color-accent-deep: #52b788;
  --color-text: #1c1c1c;
  --color-text-muted: #666660;
  --color-border: #e4e4dc;
  --color-highlight: #d8f3dc;
  --color-tag-bg: #f0faf2;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 16px rgba(26,71,42,0.08);
  --shadow-lg: 0 8px 40px rgba(26,71,42,0.13);
  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
  --max-w: 1080px;
  --max-w-narrow: 760px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── TYPOGRAPHY ── */
h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 800; line-height: 1.2; color: var(--color-primary); }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: 0.6em; }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); margin-bottom: 0.4em; font-weight: 600; }
p { margin-bottom: 1rem; color: var(--color-text); }
a { color: var(--color-primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary); text-decoration: underline; }
strong { font-weight: 600; }
ul,ol { padding-left: 1.4em; margin-bottom: 1rem; }
li { margin-bottom: 0.3em; }

/* ── LAYOUT ── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: var(--max-w-narrow); margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }
.section--sm { padding: 40px 0; }

/* ── HEADER / NAV ── */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 8px rgba(26,71,42,0.06);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.logo__icon {
  display: inline-flex;
  background: var(--color-primary);
  color: #fff;
  width: 32px; height: 32px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
}
.nav { display: flex; align-items: center; gap: 4px; }
.nav__link {
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav__link:hover { background: var(--color-accent); color: var(--color-primary); text-decoration: none; }
.nav__link--active { background: var(--color-accent); color: var(--color-primary); font-weight: 600; }
.nav__cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-left: 6px;
}
.nav__cta:hover { background: var(--color-primary-light) !important; color: #fff !important; text-decoration: none; }

/* mobile nav */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: var(--transition); }

@media(max-width:768px){
  .nav-toggle { display: flex; }
  .nav {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 12px 20px 20px;
    gap: 2px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  }
  .nav.is-open { display: flex; }
  .nav__link { width: 100%; padding: 10px 14px; }
  .nav__cta { width: 100%; text-align: center; margin-left: 0; }
}

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 70px 0 60px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 80% 50%, rgba(82,183,136,0.25) 0%, transparent 70%);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 1; }
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 50px;
  padding: 5px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}
.hero h1 { color: #fff; margin-bottom: 0.5em; }
.hero__desc { font-size: 1.1rem; color: rgba(255,255,255,0.88); max-width: 600px; margin-bottom: 0; }

/* ── QUICK ANSWER BOX ── */
.quick-answer {
  background: var(--color-highlight);
  border: 2px solid var(--color-accent-deep);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 32px 0;
}
.quick-answer__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.quick-answer__text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.5;
}
.quick-answer__text strong { font-size: 1.5rem; }

/* ── TOOL CARD ── */
.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px;
  margin: 28px 0;
}
.tool-card__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tool-card__title::before {
  content: '⚙';
  font-size: 1.1rem;
}
.tool-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: end;
  margin-bottom: 20px;
}
@media(max-width:560px){ .tool-row { grid-template-columns: 1fr; } }
.tool-field { display: flex; flex-direction: column; gap: 6px; }
.tool-field label { font-size: 0.85rem; font-weight: 600; color: var(--color-text-muted); letter-spacing: 0.04em; text-transform: uppercase; }
.tool-field input, .tool-field select {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  font-size: 1rem;
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
  outline: none;
}
.tool-field input:focus, .tool-field select:focus {
  border-color: var(--color-accent-deep);
  box-shadow: 0 0 0 3px rgba(82,183,136,0.15);
}
.tool-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  border-radius: 50%;
  color: var(--color-primary);
  font-size: 1.3rem;
  font-weight: 700;
  flex-shrink: 0;
  align-self: flex-end;
}
.tool-result {
  background: var(--color-highlight);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  border: 1px solid var(--color-accent-deep);
  display: flex;
  align-items: center;
  gap: 12px;
}
.tool-result__value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}
.tool-result__unit { font-size: 0.9rem; color: var(--color-text-muted); margin-top: 4px; }
.tool-formula {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}
.tool-formula code {
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: 5px;
  padding: 2px 8px;
  font-size: 0.85rem;
  color: var(--color-primary);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 24px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
}
.btn:hover { background: var(--color-primary-light); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(26,71,42,0.18); color: #fff; text-decoration: none; }
.btn--outline { background: transparent; color: var(--color-primary); border: 2px solid var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; }

/* ── TOC ── */
.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  margin: 32px 0;
}
.toc__title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.toc ol { padding-left: 1.2em; margin: 0; }
.toc li { margin-bottom: 4px; }
.toc a { font-size: 0.9rem; color: var(--color-text-muted); }
.toc a:hover { color: var(--color-primary); text-decoration: none; }

/* ── TABLES ── */
.table-wrap { overflow-x: auto; margin: 24px 0; border-radius: var(--radius-sm); border: 1px solid var(--color-border); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
thead th { background: var(--color-primary); color: #fff; padding: 13px 16px; text-align: left; font-weight: 600; font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; }
tbody tr:nth-child(even) { background: var(--color-bg); }
tbody tr:hover { background: var(--color-accent); }
td { padding: 11px 16px; border-bottom: 1px solid var(--color-border); }
tbody tr:last-child td { border-bottom: none; }
td strong { color: var(--color-primary); }

/* ── FAQ ── */
.faq { margin: 8px 0; }
.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--color-surface);
  transition: box-shadow var(--transition);
}
.faq__item:hover { box-shadow: var(--shadow); }
.faq__q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary);
  list-style: none;
  user-select: none;
}
.faq__q::-webkit-details-marker { display: none; }
.faq__q::after { content: '+'; font-size: 1.3rem; font-weight: 300; flex-shrink: 0; color: var(--color-accent-deep); transition: transform var(--transition); }
details[open] .faq__q::after { transform: rotate(45deg); }
.faq__a { padding: 0 20px 18px; color: var(--color-text-muted); font-size: 0.93rem; line-height: 1.7; }

/* ── CARDS ── */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; margin: 24px 0; }
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 22px;
  transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); text-decoration: none; color: inherit; }
.card__icon { font-size: 2rem; margin-bottom: 12px; }
.card__title { font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; color: var(--color-primary); margin-bottom: 6px; }
.card__desc { font-size: 0.88rem; color: var(--color-text-muted); line-height: 1.5; }

/* ── BLOG GRID ── */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; margin: 32px 0; }
.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.blog-card__img {
  height: 160px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-deep) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
}
.blog-card__body { padding: 22px 22px 20px; flex: 1; display: flex; flex-direction: column; }
.blog-card__tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-radius: 4px;
  padding: 3px 9px;
  margin-bottom: 10px;
}
.blog-card__title { font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; color: var(--color-primary); margin-bottom: 8px; line-height: 1.35; }
.blog-card__desc { font-size: 0.88rem; color: var(--color-text-muted); flex: 1; line-height: 1.55; margin-bottom: 16px; }
.blog-card__link { font-size: 0.88rem; font-weight: 600; color: var(--color-primary-light); display: flex; align-items: center; gap: 4px; }
.blog-card__link:hover { text-decoration: none; color: var(--color-primary); }

/* ── INFO BOX ── */
.info-box {
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  margin: 24px 0;
  border-left: 4px solid var(--color-accent-deep);
}
.info-box strong { color: var(--color-primary); }

/* ── CONVERSION CHIP GRID ── */
.chip-grid { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
.chip {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
.chip:hover, .chip.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ── BREADCRUMB ── */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.83rem;
  color: var(--color-text-muted);
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); text-decoration: none; }
.breadcrumb__sep { color: var(--color-border); }

/* ── RELATED LINKS ── */
.related-tools {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  margin: 40px 0;
}
.related-tools__title { font-size: 0.9rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--color-primary); margin-bottom: 16px; }
.related-tools__list { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 0; }
.related-tools__list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-primary);
  transition: background var(--transition), border-color var(--transition);
}
.related-tools__list a:hover { background: var(--color-accent); border-color: var(--color-accent-deep); text-decoration: none; }


/* ── FOOTER ── */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: 56px 0 24px;
  margin-top: 80px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
@media(max-width:640px){ .footer__grid { grid-template-columns: 1fr; gap: 28px; } }
.footer__brand .logo { color: #fff; margin-bottom: 10px; }
.footer__brand .logo__icon { background: rgba(255,255,255,0.2); }
.footer__brand p { font-size: 0.88rem; line-height: 1.6; color: rgba(255,255,255,0.65); max-width: 280px; }
.footer__col-title { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 12px; }
.footer__links { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.footer__links a { font-size: 0.88rem; color: rgba(255,255,255,0.75); transition: color var(--transition); }
.footer__links a:hover { color: #fff; text-decoration: none; }
.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
}
.footer__bottom a { color: rgba(255,255,255,0.55); }
.footer__bottom a:hover { color: #fff; text-decoration: none; }

/* ── CONTENT PROSE ── */
.prose { max-width: var(--max-w-narrow); }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.6em; color: var(--color-primary-light); }
.prose p + h2, .prose ul + h2 { margin-top: 2.5em; }
.prose .table-wrap { max-width: 100%; }

/* ── CONTACT FORM ── */
.contact-form { max-width: 560px; }
.form-row { margin-bottom: 20px; }
.form-row label { display: block; font-size: 0.88rem; font-weight: 600; color: var(--color-text); margin-bottom: 6px; }
.form-row input, .form-row textarea, .form-row select {
  width: 100%;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-row input:focus, .form-row textarea:focus {
  border-color: var(--color-accent-deep);
  box-shadow: 0 0 0 3px rgba(82,183,136,0.15);
}
.form-row textarea { min-height: 130px; resize: vertical; }
.form-msg { display: none; padding: 14px 18px; border-radius: var(--radius-sm); margin-top: 12px; font-size: 0.9rem; }
.form-msg--success { background: var(--color-highlight); border: 1px solid var(--color-accent-deep); color: var(--color-primary); display: block; }

/* ── ANIMATIONS ── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
.fade-up { animation: fadeUp 0.55s ease forwards; }
.fade-up-d1 { animation-delay: 0.1s; opacity: 0; animation-fill-mode: forwards; }
.fade-up-d2 { animation-delay: 0.2s; opacity: 0; animation-fill-mode: forwards; }
.fade-up-d3 { animation-delay: 0.32s; opacity: 0; animation-fill-mode: forwards; }

/* ── UTILITIES ── */
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: 16px; }
.mt-md { margin-top: 32px; }
.gap-sm { gap: 8px; }
.d-flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.pill {
  display: inline-block;
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* ── PAGE HEADER (non-hero pages) ── */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 52px 0 44px;
}
.page-header h1 { color: #fff; margin-bottom: 0.3em; }
.page-header p { color: rgba(255,255,255,0.85); font-size: 1.05rem; margin-bottom: 0; max-width: 600px; }

/* Print */
@media print { .site-header, .site-footer, .nav-toggle { display: none; } }