/* Kadenz Fuel · black and white, Inter, mobile first */
:root {
  --ink: #0a0a0a;
  --paper: #ffffff;
  --soft: #f4f4f2;
  --line: #e2e2de;
  --muted: #5f5f5a;
  --error: #b3261e;
  --radius: 14px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.55 "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-bottom: 84px; /* room for the sticky button on phones */
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 16px; }
h1 { font-size: clamp(34px, 9vw, 56px); font-weight: 800; }
h2 { font-size: clamp(27px, 6.5vw, 40px); font-weight: 800; }
p { margin: 0 0 14px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section.alt { background: var(--soft); }
.kicker { font-size: 13px; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; margin: 0 0 14px; }
.small { font-size: 14px; color: var(--muted); }
.lead { font-size: 19px; color: inherit; opacity: 0.86; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 56px; padding: 0 28px; border: 0; border-radius: 999px;
  background: var(--ink); color: var(--paper); font: 600 17px/1 "Inter", system-ui, sans-serif;
  text-decoration: none; cursor: pointer; width: 100%;
}
.btn:hover { background: #262626; }
.btn:focus-visible { outline: 3px solid #8a8a8a; outline-offset: 3px; }
.btn[disabled] { opacity: 0.55; cursor: progress; }
.btn.light { background: var(--paper); color: var(--ink); }
.btn.light:hover { background: #e9e9e6; }
.btn.outline { background: transparent; color: var(--ink); border: 2px solid var(--ink); }

/* header */
.top { position: absolute; inset: 0 0 auto; z-index: 2; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; letter-spacing: 0.22em; font-size: 14px; text-decoration: none; }
.top .brand { color: var(--paper); }
.plain-top { border-bottom: 1px solid var(--line); }
.plain-top .wrap { display: flex; align-items: center; height: 64px; }

/* hero */
.hero { background: #0b0b0d; color: var(--paper); padding: 40px 0 48px; }
img.narrow { width: 100%; max-width: 520px; margin: 0 auto; border-radius: var(--radius); }
.hero .grid { display: grid; gap: 28px; }
.hero h1 { color: var(--paper); }
.hero picture img { width: 100%; border-radius: var(--radius); }
.price { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; margin: 22px 0 18px; }
.price strong { font-size: 40px; font-weight: 800; letter-spacing: -0.02em; }
.price span { font-size: 15px; padding: 5px 12px; border: 1px solid rgba(255,255,255,.35); border-radius: 999px; }
.hero .small { color: rgba(255,255,255,.7); margin-top: 12px; }

/* content blocks */
.two { display: grid; gap: 32px; align-items: center; }
.two img { width: 100%; border-radius: var(--radius); }
.checks { list-style: none; padding: 0; margin: 0 0 18px; }
.checks li { position: relative; padding: 14px 0 14px 36px; border-bottom: 1px solid var(--line); font-size: 19px; font-weight: 500; }
.checks li::before { content: ""; position: absolute; left: 4px; top: 21px; width: 14px; height: 8px;
  border-left: 3px solid var(--ink); border-bottom: 3px solid var(--ink); transform: rotate(-45deg); }

.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0 18px; }
.tile { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 18px; }
.tile b { display: block; font-size: 38px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; margin-bottom: 8px; }
.tile span { font-size: 15px; color: var(--muted); }

.steps { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; gap: 12px; }
.steps li { counter-increment: s; display: flex; gap: 16px; align-items: center; padding: 18px;
  border: 1px solid var(--line); border-radius: var(--radius); font-size: 18px; font-weight: 500; background: var(--paper); }
.steps li::before { content: counter(s); flex: none; width: 40px; height: 40px; border-radius: 50%;
  background: var(--ink); color: var(--paper); display: grid; place-items: center; font-weight: 700; }

.quote { background: var(--ink); color: var(--paper); }
.quote p { font-size: clamp(24px, 6vw, 36px); font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; max-width: 820px; margin: 0; }

.legal-note { font-size: 13px; color: var(--muted); border-left: 3px solid var(--line); padding-left: 12px; margin-top: 18px; }

/* line icons: what's inside, how cash on delivery works */
.icons { list-style: none; padding: 0; margin: 8px 0 18px; display: grid; gap: 12px; }
.icons li { display: flex; align-items: center; gap: 16px; padding: 16px 18px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--paper); font-size: 18px; font-weight: 500; }
.ico { flex: none; width: 52px; height: 52px; border: 1.5px solid var(--ink); border-radius: 50%; display: grid; place-items: center; }

/* form */
.order { background: var(--soft); }
.form-card { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 24px 18px; max-width: 640px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; font-size: 15px; margin-bottom: 6px; }
.field .opt { font-weight: 400; color: var(--muted); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 52px; padding: 12px 14px; font: 400 17px/1.3 "Inter", system-ui, sans-serif;
  color: var(--ink); background: var(--paper); border: 1.5px solid #c9c9c4; border-radius: 12px; appearance: none;
}
.field select { background-image: linear-gradient(45deg, transparent 50%, var(--ink) 50%), linear-gradient(135deg, var(--ink) 50%, transparent 50%);
  background-position: calc(100% - 22px) 23px, calc(100% - 16px) 23px; background-size: 6px 6px; background-repeat: no-repeat; padding-right: 40px; }
.field select:disabled { background-color: var(--soft); color: var(--muted); }
.field textarea { min-height: 84px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(10,10,10,.12); }
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: var(--error); }
.err { display: none; color: var(--error); font-size: 14px; margin-top: 6px; }
.field.invalid .err { display: block; }
.row2 { display: grid; gap: 0 14px; }
.consent { display: flex; gap: 12px; align-items: flex-start; font-size: 14px; line-height: 1.45; color: #2e2e2b; }
.consent input { flex: none; width: 22px; height: 22px; min-height: 0; margin-top: 2px; accent-color: var(--ink); appearance: auto; }
.total { text-align: center; font-size: 15px; color: var(--muted); margin: 12px 0 0; }
.form-error { display: none; background: #fdecea; color: var(--error); padding: 12px 14px; border-radius: 12px; font-size: 15px; margin-bottom: 14px; }
.form-error.show { display: block; }

/* faq */
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 36px 20px 0; font-weight: 600; font-size: 18px; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 16px; font-size: 26px; font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 0 20px; color: #333330; }
.faq .btn { width: auto; margin-top: -6px; margin-bottom: 20px; }

/* footer */
.foot { background: var(--ink); color: rgba(255,255,255,.78); padding: 48px 0 32px; font-size: 14px; }
.foot .brand { color: var(--paper); display: inline-block; margin-bottom: 18px; }
.foot p { margin: 0 0 8px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 22px 0; }
.foot nav a { color: var(--paper); }
.foot .fine { color: rgba(255,255,255,.55); font-size: 13px; margin-top: 18px; }

/* sticky button (phones) */
.sticky { position: fixed; left: 0; right: 0; bottom: 0; z-index: 10; padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(255,255,255,.96); border-top: 1px solid var(--line); transition: transform .2s ease; }
.sticky.hide { transform: translateY(110%); }

/* simple pages */
.page { padding: 48px 0 72px; }
.page .wrap { max-width: 760px; }
.page h2 { font-size: 22px; margin-top: 32px; }
.page ul { padding-left: 20px; }
.page li { margin-bottom: 8px; }
.thanks { text-align: center; padding: 72px 0; }
.thanks .btn { width: auto; }

@media (min-width: 768px) {
  body { padding-bottom: 0; }
  .sticky { display: none; }
  .section { padding: 96px 0; }
  .hero { padding: 88px 0 80px; }
  .hero .grid { grid-template-columns: 1.05fr 1fr; align-items: center; gap: 56px; }
  .hero .btn { width: auto; min-width: 280px; }
  .two { grid-template-columns: 1fr 1fr; gap: 64px; }
  .two.flip > :first-child { order: 2; }
  .tiles { grid-template-columns: repeat(4, 1fr); }
  .two .tiles { grid-template-columns: 1fr 1fr; }
  .steps, .icons { grid-template-columns: repeat(3, 1fr); }
  .icons li { flex-direction: column; align-items: flex-start; }
  .steps li { flex-direction: column; align-items: flex-start; }
  .row2 { grid-template-columns: 1fr 1fr; }
  .form-card { padding: 36px; margin: 0 auto; }
  .order h2, .order .intro { text-align: center; }
  .form-card .btn { width: 100%; }
}