/* ==========================================================================
   SeattleOil.com — Design System
   Tokens: slate-forest ink, seafoam-tinted paper, steel blue (automotive),
   teal (heating), deep forest (cooking/wellness + trust), cerulean (brand/
   utility accent), lime (single signature pop — dipstick reading), seafoam
   (soft surface fills), slate gray (secondary neutral)
   Display: Zilla Slab · Body: Inter · Utility/data: IBM Plex Mono
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Zilla+Slab:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --ink: #16211F;
  --ink-70: rgba(22,33,31,0.7);
  --ink-45: rgba(22,33,31,0.45);
  --paper: #EAF1EE;
  --paper-raised: #F4F9F7;
  --line: #D2DED8;
  --line-strong: #B7C6BF;

  --steel: #4C6B80;
  --steel-dark: #37505F;
  --teal: #1F6E71;
  --teal-dark: #17565A;
  --forest: #1F4B3F;
  --forest-dark: #163A30;
  --cerulean: #2E7DA6;
  --cerulean-dark: #215D7B;
  --seafoam: #8FC7B8;
  --seafoam-dark: #4F9683;
  --lime: #A8C93B;
  --slate: #5B6B6B;

  --radius-s: 3px;
  --radius-m: 6px;
  --shadow-card: 0 1px 0 var(--line), 0 8px 20px -14px rgba(22,33,31,0.35);

  --display: 'Zilla Slab', Georgia, serif;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: var(--body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family: var(--display); font-weight:600; margin:0 0 .5em; letter-spacing: -0.01em; }
p{ margin:0 0 1em; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family: var(--body); cursor:pointer; }
:focus-visible{ outline: 2px solid var(--cerulean); outline-offset: 2px; }

.wrap{ max-width: 1140px; margin: 0 auto; padding: 0 28px; }
.eyebrow{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-45);
  display:flex; align-items:center; gap:10px;
  margin-bottom: 14px;
}
.eyebrow::before{ content:''; width:16px; height:1px; background: var(--line-strong); }

/* ---------- Header ---------- */
.site-header{
  position: sticky; top:0; z-index: 50;
  background: rgba(234,241,238,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap{ display:flex; align-items:center; justify-content:space-between; height:72px; }
.logo{ display:flex; align-items:center; gap:10px; font-family: var(--display); font-weight:700; font-size:20px; }
.logo .drop{ width:12px; height:16px; border-radius: 50% 50% 50% 0; background: var(--cerulean); transform: rotate(45deg); box-shadow: inset -2px -2px 0 rgba(0,0,0,0.15); }
.logo small{ font-family: var(--mono); font-weight:400; font-size:11px; letter-spacing:.08em; color: var(--ink-45); text-transform:uppercase; display:block; }
nav.main-nav ul{ display:flex; gap: 26px; }
nav.main-nav a{ font-size:14px; font-weight:500; color: var(--ink-70); border-bottom: 2px solid transparent; padding-bottom: 4px; transition: color .15s, border-color .15s; }
nav.main-nav a:hover, nav.main-nav a.active{ color: var(--ink); border-color: var(--lime); }
.nav-toggle{ display:none; background:none; border:1px solid var(--line-strong); border-radius: var(--radius-s); width:40px; height:36px; }

/* ---------- Gauge divider — signature element ---------- */
.gauge{
  display:flex; align-items:stretch; gap:2px;
  height: 34px; border:1px solid var(--ink); border-radius: var(--radius-s);
  overflow:hidden; background: var(--paper-raised);
}
.gauge .seg{ flex:1; position:relative; display:flex; align-items:center; justify-content:center; }
.gauge .seg .fill{ position:absolute; inset:0; transform-origin:left; }
.gauge .seg span{ position:relative; z-index:1; font-family: var(--mono); font-size:11px; letter-spacing:.06em; text-transform:uppercase; }
.gauge .seg:nth-child(1) .fill{ background: var(--steel); opacity:.85; }
.gauge .seg:nth-child(2) .fill{ background: var(--teal); opacity:.85; }
.gauge .seg:nth-child(3) .fill{ background: var(--forest); opacity:.85; }
.gauge .seg:nth-child(1) span, .gauge .seg:nth-child(2) span, .gauge .seg:nth-child(3) span{ color:#fff; }

/* ---------- Hero ---------- */
.hero{ padding: 76px 0 60px; border-bottom:1px solid var(--line); }
.hero .grid{ display:grid; grid-template-columns: 1.15fr 0.85fr; gap:56px; align-items:center; }
.hero h1{ font-size: 52px; line-height:1.04; margin-bottom:20px; }
.hero h1 em{ font-style:normal; color: var(--cerulean-dark); }
.hero .lede{ font-size:18px; color: var(--ink-70); max-width: 46ch; margin-bottom:28px; }
.hero-actions{ display:flex; gap:14px; margin-bottom: 34px; }
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 13px 22px; border-radius: var(--radius-s);
  font-weight:600; font-size:14.5px; border:1px solid var(--ink);
  transition: transform .12s ease, background .15s, color .15s;
}
.btn-primary{ background: var(--ink); color:#fff; }
.btn-primary:hover{ background: var(--forest-dark); border-color: var(--forest-dark); transform: translateY(-1px); }
.btn-ghost{ background:transparent; color: var(--ink); }
.btn-ghost:hover{ background: var(--ink); color:#fff; }

.dipstick-panel{
  background: var(--ink); border-radius: var(--radius-m); padding: 26px;
  color: var(--paper); position:relative;
}
.dipstick-panel .eyebrow{ color: rgba(234,241,238,0.55); }
.dipstick-panel .eyebrow::before{ background: rgba(234,241,238,0.3); }
.dipstick-row{ display:flex; align-items:center; gap:14px; padding: 13px 0; border-bottom: 1px solid rgba(234,241,238,0.14); }
.dipstick-row:last-child{ border-bottom:none; }
.dipstick-row .tick{ font-family: var(--mono); font-size:11px; color: rgba(234,241,238,0.4); width:24px; }
.dipstick-row .label{ flex:1; font-weight:500; }
.dipstick-row .val{ font-family: var(--mono); font-size:13px; color: var(--lime); }

/* ---------- Sections ---------- */
.section{ padding: 68px 0; }
.section-head{ display:flex; justify-content:space-between; align-items:flex-end; margin-bottom: 38px; gap: 24px; }
.section-head h2{ font-size:34px; margin:0; }
.section-head .desc{ color: var(--ink-70); max-width: 40ch; margin:0; }
.section-alt{ background: var(--paper-raised); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

/* ---------- Vertical cards ---------- */
.verticals{ display:grid; grid-template-columns: repeat(3,1fr); gap:22px; }
.v-card{
  background: var(--paper-raised); border:1px solid var(--line); border-radius: var(--radius-m);
  padding: 28px 26px; box-shadow: var(--shadow-card);
  display:flex; flex-direction:column; gap:14px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.v-card:hover{ transform: translateY(-3px); }
.v-card .icon{ width:40px; height:40px; border-radius: 50%; display:flex; align-items:center; justify-content:center; font-family: var(--mono); font-weight:600; font-size:13px; color:#fff; }
.v-card.auto .icon{ background: var(--steel); }
.v-card.heat .icon{ background: var(--teal); }
.v-card.cook .icon{ background: var(--forest); }
.v-card h3{ font-size:21px; margin-bottom:2px; }
.v-card p{ color: var(--ink-70); font-size:14.5px; margin-bottom:0; }
.v-card .tags{ display:flex; flex-wrap:wrap; gap:6px; margin-top:4px; }
.tag{ font-family: var(--mono); font-size:10.5px; text-transform:uppercase; letter-spacing:.04em; padding: 4px 8px; border:1px solid var(--line-strong); background: color-mix(in srgb, var(--seafoam) 35%, var(--paper-raised)); border-radius: 20px; color: var(--ink-70); }
.v-card .go{ margin-top:auto; font-weight:600; font-size:13.5px; display:flex; align-items:center; gap:6px; }
.auto .go{ color: var(--steel-dark); }
.heat .go{ color: var(--teal-dark); }
.cook .go{ color: var(--forest-dark); }

/* ---------- Listings ---------- */
.listing{
  display:grid; grid-template-columns: auto 1fr auto; gap:20px; align-items:center;
  padding: 20px 22px; border:1px solid var(--line); border-radius: var(--radius-m);
  background: var(--paper-raised); margin-bottom: 14px;
}
.listing .rank{ font-family: var(--mono); font-size:13px; color: var(--ink-45); width:26px; }
.listing h4{ font-family: var(--display); font-size:18px; margin:0 0 4px; }
.listing .meta{ font-size:13px; color: var(--ink-70); display:flex; gap:12px; flex-wrap:wrap; }
.listing .badge-verified{ font-family: var(--mono); font-size:10.5px; text-transform:uppercase; background: var(--forest); color:#fff; padding:3px 8px; border-radius: 20px; letter-spacing:.04em; }
.listing .rating{ font-family: var(--mono); font-size:13px; text-align:right; white-space:nowrap; }
.listing .rating b{ color: var(--ink); font-size:15px; }

/* ---------- Guide / content blocks ---------- */
.guide{ display:grid; grid-template-columns: 0.9fr 1.1fr; gap:50px; align-items:start; }
.guide-list{ counter-reset: g; }
.guide-list li{ counter-increment: g; display:flex; gap:16px; padding: 18px 0; border-top:1px solid var(--line); }
.guide-list li:last-child{ border-bottom: 1px solid var(--line); }
.guide-list li::before{ content: counter(g, decimal-leading-zero); font-family: var(--mono); font-size:13px; color: var(--cerulean-dark); padding-top:2px; }
.guide-list h4{ margin:0 0 4px; font-size:16px; font-family: var(--body); font-weight:600; }
.guide-list p{ margin:0; font-size:14px; color: var(--ink-70); }

/* ---------- Pricing ---------- */
.pricing{ display:grid; grid-template-columns: repeat(3,1fr); gap:20px; }
.price-card{ border:1px solid var(--line); border-radius: var(--radius-m); padding:28px; background: var(--paper-raised); }
.price-card.featured{ border-color: var(--ink); box-shadow: 0 0 0 1px var(--ink); position:relative; }
.price-card .plan{ font-family: var(--mono); text-transform:uppercase; font-size:11px; letter-spacing:.08em; color: var(--ink-45); margin-bottom:10px; }
.price-card .amount{ font-family: var(--display); font-size:36px; margin-bottom:4px; }
.price-card .amount span{ font-family: var(--body); font-size:14px; font-weight:400; color: var(--ink-45); }
.price-card ul{ margin: 18px 0 22px; display:flex; flex-direction:column; gap:9px; }
.price-card li{ font-size:13.5px; color: var(--ink-70); padding-left:18px; position:relative; }
.price-card li::before{ content:'—'; position:absolute; left:0; color: var(--cerulean-dark); }

/* ---------- Forms ---------- */
.form-grid{ display:grid; grid-template-columns: 1fr 1fr; gap:18px; }
.field{ display:flex; flex-direction:column; gap:6px; margin-bottom:18px; }
.field.full{ grid-column: 1/-1; }
.field label{ font-size:13px; font-weight:600; }
.field .hint{ font-size:12px; color: var(--ink-45); }
input, select, textarea{
  font-family: var(--body); font-size:14.5px; padding:11px 13px;
  border:1px solid var(--line-strong); border-radius: var(--radius-s);
  background: #fff; color: var(--ink);
}
textarea{ resize: vertical; min-height:90px; }
input:focus, select:focus, textarea:focus{ border-color: var(--ink); }

/* ---------- Values / trust rows ---------- */
.values{ display:grid; grid-template-columns: repeat(2,1fr); gap:16px; }
.value-row{ display:flex; gap:14px; padding:16px 0; border-top:1px solid var(--line); }
.value-row:nth-last-child(-n+2){ border-bottom: 1px solid var(--line); }
.value-row .mark{ font-family: var(--mono); font-size:12px; color: var(--forest); }
.value-row.avoid .mark{ color: var(--steel-dark); }
.value-row h4{ margin:0 0 3px; font-size:15px; font-family: var(--body); font-weight:600; }
.value-row p{ margin:0; font-size:13.5px; color: var(--ink-70); }

/* ---------- Footer ---------- */
footer{ border-top:1px solid var(--line); padding: 46px 0 40px; }
.footer-grid{ display:grid; grid-template-columns: 1.3fr repeat(2, 1fr); gap:32px; margin-bottom:36px; }
.footer-grid h5{ font-family: var(--mono); font-size:11px; text-transform:uppercase; letter-spacing:.08em; color: var(--ink-45); margin-bottom:14px; }
.footer-grid li{ margin-bottom:9px; font-size:14px; }
.footer-grid a:hover{ color: var(--cerulean-dark); }
.footer-bottom{ display:flex; justify-content:space-between; align-items:center; padding-top:24px; border-top:1px solid var(--line); font-size:12.5px; color: var(--ink-45); font-family: var(--mono); }

/* ---------- Page intro (subpages) ---------- */
.page-intro{ padding: 52px 0 40px; border-bottom:1px solid var(--line); }
.page-intro h1{ font-size:42px; max-width: 20ch; }
.page-intro .lede{ font-size:16.5px; color: var(--ink-70); max-width:56ch; }
.filters{ display:flex; gap:10px; flex-wrap:wrap; margin-top:24px; }
.filter-chip{ font-family: var(--mono); font-size:12px; text-transform:uppercase; letter-spacing:.03em; padding:8px 14px; border:1px solid var(--line-strong); border-radius:20px; color: var(--slate); background: var(--paper-raised); }
.filter-chip.active{ background: var(--steel); color:#fff; border-color: var(--steel); }

/* ---------- Utility ---------- */
.center{ text-align:center; }
.mt-0{ margin-top:0; }

/* ---------- Guides / Blog ---------- */
.cat-badge{ font-family: var(--mono); font-size:11px; text-transform:uppercase; letter-spacing:.06em; padding:4px 10px; border-radius:20px; color:#fff; display:inline-block; }
.cat-badge.auto{ background: var(--steel); }
.cat-badge.heat{ background: var(--teal); }
.cat-badge.cook{ background: var(--forest); }
.cat-badge.energy{ background: var(--cerulean); }

.guide-cards{ display:grid; grid-template-columns: repeat(2,1fr); gap:20px; }
.guide-card{ background: var(--paper-raised); border:1px solid var(--line); border-radius: var(--radius-m); padding:24px 24px 22px; box-shadow: var(--shadow-card); display:flex; flex-direction:column; gap:10px; transition: transform .15s ease; }
.guide-card:hover{ transform: translateY(-2px); }
.guide-card .cat-badge{ align-self:flex-start; }
.guide-card h3{ font-size:19px; margin:4px 0 0; }
.guide-card p{ color: var(--ink-70); font-size:14px; margin:0; }
.guide-card .read{ margin-top:auto; font-weight:600; font-size:13.5px; color: var(--cerulean-dark); }

.article-head{ padding: 48px 0 34px; border-bottom:1px solid var(--line); }
.article-head h1{ font-size:38px; max-width:26ch; margin-top:10px; }
.article-head .dek{ font-size:17px; color: var(--ink-70); max-width:60ch; }
.article-meta{ font-family: var(--mono); font-size:12px; color: var(--ink-45); margin-top:16px; }

.article-body{ max-width: 68ch; font-size:16.5px; line-height:1.75; padding: 46px 0; }
.article-body h2{ font-size:24px; margin: 40px 0 14px; }
.article-body h2:first-child{ margin-top:0; }
.article-body h3{ font-size:18px; margin: 28px 0 10px; font-family: var(--body); font-weight:700; }
.article-body p{ margin:0 0 18px; color: var(--ink-70); }
.article-body ul, .article-body ol{ margin: 0 0 18px; padding-left: 22px; color: var(--ink-70); }
.article-body li{ margin-bottom:8px; }
.article-body strong{ color: var(--ink); }
.article-body .lead{ font-size:19px; color: var(--ink); }
.pull-note{ border-left:3px solid var(--cerulean); background: var(--paper-raised); padding: 16px 20px; border-radius: 0 var(--radius-s) var(--radius-s) 0; margin: 8px 0 26px; font-size:14.5px; color: var(--ink-70); }
.pull-note strong{ color: var(--ink); }

.related-box{ background: var(--ink); color: var(--paper); border-radius: var(--radius-m); padding:28px 30px; display:flex; align-items:center; justify-content:space-between; gap:24px; margin-top:12px; }
.related-box p{ margin:4px 0 0; color: rgba(234,241,238,0.65); font-size:14px; }
.related-box h4{ margin:0; color:#fff; font-size:18px; }
.related-box .btn-primary{ background: var(--cerulean); border-color: var(--cerulean); flex-shrink:0; }
.related-box .btn-primary:hover{ background: var(--paper); border-color: var(--paper); color: var(--ink); }

.back-link{ display:inline-flex; align-items:center; gap:6px; font-size:13.5px; font-weight:600; color: var(--ink-70); margin-bottom:18px; }
.back-link:hover{ color: var(--ink); }

@media (max-width: 880px){
  .wrap{ padding: 0 20px; }
  .site-header .wrap{ height:64px; position:relative; }
  .hero .grid, .guide, .footer-grid{ grid-template-columns: 1fr; }
  .verticals, .pricing, .form-grid, .values, .guide-cards{ grid-template-columns: 1fr; }
  nav.main-nav{
    display:none;
    position:absolute;
    top:100%;
    left:20px;
    right:20px;
    padding:8px;
    background: var(--paper-raised);
    border:1px solid var(--line);
    border-radius: var(--radius-m);
    box-shadow: var(--shadow-card);
  }
  nav.main-nav.is-open{ display:block; }
  nav.main-nav ul{ flex-direction:column; gap:0; }
  nav.main-nav a{
    display:block;
    padding:11px 10px;
    border-bottom:1px solid var(--line);
  }
  nav.main-nav li:last-child a{ border-bottom:none; }
  .nav-toggle{ display:inline-flex; align-items:center; justify-content:center; font-size:18px; }
  .hero{ padding: 52px 0 44px; }
  .hero-actions, .section-head, .footer-bottom{ flex-direction:column; align-items:flex-start; }
  .hero-actions{ gap:10px; }
  .hero-actions .btn, .related-box .btn{ width:100%; justify-content:center; }
  .section{ padding: 52px 0; }
  .related-box{ flex-direction:column; align-items:flex-start; }

  .listing{ grid-template-columns: auto 1fr; row-gap:10px; padding:16px 18px; }
  .listing .rating{
    grid-column: 1 / -1;
    text-align:left;
    white-space:normal;
    padding-top:10px;
    border-top:1px dashed var(--line);
  }
  .listing .meta{ gap:8px 12px; }

  .page-intro h1{ font-size:32px; }
  .article-head h1{ font-size:28px; }
  .hero h1{ font-size:32px; }

  .gauge .seg span{ font-size:9px; letter-spacing:.02em; padding:0 4px; text-align:center; }
}

@media (max-width: 420px){
  .wrap{ padding: 0 16px; }
  nav.main-nav{ left:16px; right:16px; }
  .logo{ font-size:18px; }
  .logo small{ font-size:10px; }
  .btn{ width:100%; justify-content:center; padding:12px 16px; }
  .dipstick-panel, .price-card, .guide-card{ padding:22px 20px; }
  .article-body{ font-size:16px; }
}

/* ---------- Market snapshot widget ---------- */
.market-snapshot{
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-raised);
  padding: 30px 0;
}
.market-snapshot .head{ display:flex; align-items:center; justify-content:space-between; gap:16px; margin-bottom:16px; flex-wrap:wrap; }
.market-snapshot .head h3{ font-size:16px; margin:0; }
.market-card{
  border:1px solid var(--line);
  border-radius: var(--radius-m);
  background:#fff;
  padding: 4px 14px 8px;
}
.market-snapshot .disclaimer{
  font-size:12px;
  color: var(--ink-45);
  margin: 12px 0 0;
  max-width: 60ch;
}