/* ==========================================================================
   Oakline Gas — design tokens
   Palette: flame blue / deep marine / brass fitting accent / cool steel paper
   Type: Oswald (display, condensed/industrial) + Work Sans (body) + IBM Plex Mono (readouts)
   ========================================================================== */

:root {
  --ink:        #0B1220;
  --deep:       #0B2E59;
  --flame:      #1C6FEB;
  --flame-dark: #124FB0;
  --accent:     #4FA3E3;
  --paper:      #FFFFFF;
  --paper-dim:  #F5F7F9;
  --steel:      #5B6672;
  --steel-dk:   #33404B;
  --white:      #FFFFFF;
  --line:       #E3E7EB;

  --display: "Oswald", "Arial Narrow", sans-serif;
  --display-serif: "Fraunces", "Georgia", serif;
  --body: "Work Sans", -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --radius: 3px;
  --container: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--body);
  color: var(--steel-dk);
  background: var(--paper);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  text-transform: uppercase;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.08;
}

h1, h2 {
  font-family: var(--display-serif);
  text-transform: none;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

h1 { font-size: clamp(2.6rem, 5.4vw, 4.6rem); font-weight: 500; }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); }
h3 { font-size: 1.15rem; letter-spacing: 0.03em; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--flame);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
  display: inline-block;
}

p.lead { font-size: 1.1rem; color: var(--steel); max-width: 60ch; }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.92rem;
  padding: 14px 26px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--flame); color: var(--white); }
.btn-primary:hover { background: var(--flame-dark); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--white); }
.btn-brass { background: var(--accent); color: var(--ink); }
.btn-brass:hover { background: var(--accent); }

/* ==========================================================================
   Header
   ========================================================================== */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 84px;
}
.brand {
  font-family: var(--display);
  color: var(--ink);
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  display: flex; align-items: center; gap: 10px;
}
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--flame);
  text-transform: uppercase;
  font-weight: 400;
}
.flame-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 3px rgba(28,111,235,0.18);
  animation: pulse 2.2s infinite;
  flex: none;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(28,111,235,0.18); }
  50% { box-shadow: 0 0 0 6px rgba(28,111,235,0.06); }
}
nav.primary { display: flex; align-items: center; gap: 30px; }
nav.primary a {
  color: var(--steel-dk);
  font-size: 0.88rem;
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
nav.primary a:hover { color: var(--flame); }
nav.primary .call {
  color: var(--white);
  background: var(--flame);
  border: 1px solid var(--flame);
  padding: 11px 20px;
  border-radius: var(--radius);
  display: flex; align-items: center; gap: 8px;
  font-weight: 500;
}
nav.primary .call:hover { background: var(--flame-dark); border-color: var(--flame-dark); }
.nav-toggle { display: none; }

@media (max-width: 860px) {
  nav.primary .links { display: none; }
  nav.primary { gap: 12px; }
}

/* ==========================================================================
   Hero + control-panel signature
   ========================================================================== */
.hero {
  background:
    linear-gradient(100deg, rgba(11,18,32,0.72) 0%, rgba(11,18,32,0.58) 45%, rgba(11,18,32,0.42) 100%),
    url("hero-bg.jpg") center center / cover no-repeat,
    var(--ink);
  color: var(--white);
  padding: 64px 0 54px;
  position: relative;
  overflow: hidden;
}
.hero .wrap { position: relative; z-index: 2; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 50px;
  align-items: center;
}
.hero h1 { color: var(--white); text-shadow: 0 2px 18px rgba(0,0,0,0.45); }
.hero h1 em { color: var(--accent); font-style: italic; font-weight: 400; }
.hero p.lead { color: rgba(255,255,255,0.85); margin: 22px 0 30px; text-shadow: 0 1px 10px rgba(0,0,0,0.4); }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

/* gauge panel */
.panel {
  background: linear-gradient(180deg, rgba(16,28,48,0.92), rgba(11,18,32,0.96));
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 6px;
  padding: 26px;
  font-family: var(--mono);
  backdrop-filter: blur(2px);
}
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  border-bottom: 1px dashed rgba(255,255,255,0.15);
  padding-bottom: 14px; margin-bottom: 18px;
}
.panel-head .live { color: var(--flame); display: flex; align-items: center; gap: 6px; }
.gauge-row { display: flex; gap: 22px; align-items: center; margin-bottom: 18px; }
.gauge {
  width: 92px; height: 46px;
  position: relative;
  flex: none;
}
.gauge svg { width: 100%; height: 100%; }
.gauge-needle {
  transform-origin: 46px 46px;
  animation: sweep 4.5s ease-in-out infinite;
}
@keyframes sweep {
  0%, 100% { transform: rotate(-38deg); }
  50% { transform: rotate(38deg); }
}
.gauge-label { font-size: 0.62rem; color: rgba(255,255,255,0.5); letter-spacing: 0.1em; text-transform: uppercase; margin-top: 4px; }
.panel-stat-value { color: var(--white); font-size: 1.05rem; }
.panel-list { display: grid; gap: 10px; font-size: 0.78rem; color: rgba(255,255,255,0.75); }
.panel-list li { display: flex; justify-content: space-between; border-bottom: 1px solid rgba(255,255,255,0.06); padding-bottom: 8px; }
.panel-list li span:last-child { color: var(--accent); }

.trust-strip {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.trust-strip .wrap {
  display: flex; flex-wrap: wrap; gap: 34px; justify-content: space-between;
  align-items: center;
}
.trust-item {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em;
  color: var(--steel); text-transform: uppercase;
}
.trust-item b { color: var(--ink); font-weight: 600; }

/* ==========================================================================
   Sections
   ========================================================================== */
section { padding: 100px 0; }
section.tight { padding: 64px 0; }
.section-head { max-width: 640px; margin-bottom: 46px; position: relative; padding-top: 4px; }
.section-head::before {
  content: "";
  display: block;
  width: 46px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 20px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head.center::before { margin-left: auto; margin-right: auto; }

.bg-white { background: var(--white); }
.bg-paper { background: var(--paper-dim); }
.bg-ink { background: var(--ink); color: var(--white); }
.bg-ink h2 { color: var(--white); }

/* services grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 2px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service-card {
  background: var(--white);
  padding: 32px 26px;
  transition: background 0.18s ease;
  position: relative;
}
.service-card:hover { background: #FBFCFD; }
.service-card .num {
  font-family: var(--mono); color: var(--accent); font-size: 0.72rem;
  letter-spacing: 0.1em; margin-bottom: 20px; display: block;
}
.service-card h3 { margin-bottom: 10px; }
.service-card p { color: var(--steel); font-size: 0.92rem; margin-bottom: 18px; }
.service-card .go {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em;
  color: var(--flame); text-transform: uppercase;
}
.service-card:hover .go { text-decoration: underline; }

/* process steps */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.process .step .n {
  font-family: var(--mono); color: var(--flame); font-size: 0.85rem;
  border: 1px solid var(--flame); width: 34px; height: 34px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.process .step h4 { font-size: 1rem; margin-bottom: 8px; }
.process .step p { color: var(--steel); font-size: 0.9rem; }

/* about split */
.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.credential-list { display: grid; gap: 16px; margin-top: 24px; }
.credential-list li {
  display: flex; gap: 14px; align-items: flex-start;
  font-size: 0.95rem; color: var(--steel-dk);
}
.credential-list li .tick {
  color: var(--flame); font-family: var(--mono); flex: none; margin-top: 2px;
}

.stat-block {
  border-left: 3px solid var(--accent);
  padding: 8px 0 8px 18px;
}
.stat-block .val { font-family: var(--display); font-size: 2.2rem; color: var(--ink); }
.stat-block .lab { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--steel); text-transform: uppercase; }
.stat-row { display: flex; gap: 40px; flex-wrap: wrap; margin-top: 34px; }

/* certificate plate */
.plate {
  background: var(--ink);
  color: var(--white);
  border-radius: 6px;
  padding: 30px;
  font-family: var(--mono);
  border: 1px solid rgba(255,255,255,0.1);
}
.plate .row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px dashed rgba(255,255,255,0.15); font-size: 0.82rem; }
.plate .row:last-child { border-bottom: none; }
.plate .row span:last-child { color: var(--accent); }

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.faq-item summary {
  cursor: pointer;
  font-family: var(--display);
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  display: flex; justify-content: space-between; align-items: center;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: var(--mono); color: var(--flame); font-size: 1.3rem;
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p { color: var(--steel); margin-top: 14px; max-width: 68ch; font-size: 0.95rem; }

/* CTA band */
.cta-band {
  background: var(--flame);
  color: var(--white);
  padding: 56px 0;
}
.cta-band .wrap { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.cta-band h2 { color: var(--white); font-size: clamp(1.6rem, 3vw, 2.2rem); }
.cta-band .btn-ghost { border-color: rgba(255,255,255,0.6); color: var(--white); }
.cta-band .btn-ghost:hover { background: var(--white); color: var(--flame); }

/* service page hero (secondary) */
.page-hero {
  background:
    linear-gradient(100deg, rgba(11,18,32,0.72) 0%, rgba(11,29,58,0.62) 100%),
    url("page-hero-bg.jpg") center 45% / cover no-repeat,
    var(--deep);
  color: var(--white);
  padding: 70px 0 50px;
}
.page-hero .eyebrow { color: var(--accent); }
.page-hero .eyebrow::before { background: var(--flame); }
.page-hero h1 { color: var(--white); font-size: clamp(2.2rem, 4.6vw, 3.4rem); text-shadow: 0 2px 16px rgba(0,0,0,0.45); }
.page-hero h1 em { color: var(--accent); font-style: italic; font-weight: 400; }
.breadcrumb { font-family: var(--mono); font-size: 0.72rem; color: rgba(255,255,255,0.55); margin-bottom: 20px; letter-spacing: 0.05em; }
.breadcrumb a { color: rgba(255,255,255,0.75); }
.breadcrumb a:hover { color: var(--white); }

.check-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px 40px;
}
.check-grid li {
  display: flex; gap: 12px; font-size: 0.96rem; padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.check-grid li .tick { color: var(--flame); font-family: var(--mono); }

/* contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.form-field { margin-bottom: 18px; }
.form-field label {
  display: block; font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--steel); margin-bottom: 8px;
}
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 13px 14px; border: 1px solid var(--line);
  border-radius: var(--radius); font-family: var(--body); font-size: 0.96rem;
  background: var(--white);
}
.form-field textarea { resize: vertical; min-height: 120px; }
.contact-info-item { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.contact-info-item .ico { font-family: var(--mono); color: var(--flame); }

/* footer */
footer.site {
  background: var(--ink); color: rgba(255,255,255,0.6);
  padding: 60px 0 26px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08);
}
footer.site h4 {
  color: var(--white); font-size: 0.82rem; letter-spacing: 0.08em; margin-bottom: 16px;
}
footer.site ul li { margin-bottom: 10px; font-size: 0.88rem; }
footer.site ul li a:hover { color: var(--white); }
.footer-bottom {
  padding-top: 22px; display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 10px; font-size: 0.78rem; font-family: var(--mono);
}

@media (max-width: 880px) {
  .hero-grid, .split, .contact-grid { grid-template-columns: 1fr; }
  .process { grid-template-columns: 1fr 1fr; }
  .check-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  nav.primary .links { display: none; }
}
@media (max-width: 560px) {
  .process { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}