:root {
  --bg: #0a1218;
  --bg-elevated: #121c26;
  --bg-soft: #182430;
  --text: #e8eef4;
  --text-muted: #9aabbc;
  --accent: #d4a017;
  --accent-soft: rgba(212, 160, 23, 0.16);
  --line: rgba(232, 238, 244, 0.1);
  --danger: #e07070;
  --success: #6fbf8a;
  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Manrope", "Segoe UI", sans-serif;
  --radius: 4px;
  --max: 1120px;
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(212, 160, 23, 0.08), transparent 55%),
    radial-gradient(900px 500px at 100% 20%, rgba(40, 90, 120, 0.18), transparent 50%),
    var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  background: linear-gradient(180deg, rgba(10, 18, 24, 0.92), rgba(10, 18, 24, 0.55) 70%, transparent);
  backdrop-filter: blur(8px);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.logo-mark {
  width: 14px;
  height: 28px;
  border-radius: 2px;
  background: linear-gradient(180deg, #f0c44a, var(--accent) 55%, #8a6508);
  box-shadow: 0 0 0 1px rgba(212, 160, 23, 0.35);
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.55rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--text);
}

.nav-cta {
  padding: 0.55rem 0.95rem;
  border: 1px solid rgba(212, 160, 23, 0.45);
  border-radius: var(--radius);
  color: var(--accent) !important;
  background: var(--accent-soft);
}

.nav-cta:hover {
  border-color: var(--accent);
  color: #ffe7a0 !important;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  background:
    url("../img/hero-oil.jpg") center / cover no-repeat;
  transform: scale(1.04);
  animation: hero-drift 18s ease-in-out infinite alternate;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 14, 20, 0.92) 0%, rgba(8, 14, 20, 0.72) 42%, rgba(8, 14, 20, 0.35) 100%),
    linear-gradient(0deg, rgba(8, 14, 20, 0.95) 0%, rgba(8, 14, 20, 0.35) 45%, rgba(8, 14, 20, 0.55) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: calc(var(--header-h) + 4rem) clamp(1.25rem, 4vw, 3rem) 5.5rem;
  animation: rise-in 0.9s ease both;
}

.brand-lockup {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  line-height: 0.95;
  text-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}

.hero-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  max-width: 14ch;
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 34rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(180deg, #e0b12a, var(--accent));
  color: #1a1405;
  border-color: #c9940f;
}

.btn-primary:hover {
  background: linear-gradient(180deg, #ecc24a, #d9a61c);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: rgba(232, 238, 244, 0.28);
  background: rgba(255, 255, 255, 0.07);
}

.section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
}

.section-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

.section-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-lead {
  margin: 0 0 2.5rem;
  max-width: 38rem;
  color: var(--text-muted);
}

.fuels {
  background:
    linear-gradient(180deg, transparent, rgba(24, 36, 48, 0.55)),
    var(--bg);
}

.fuel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.fuels-group-title {
  margin: 2rem 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.fuels-group-title:first-of-type {
  margin-top: 0;
}

.fuel-item {
  background: var(--bg-elevated);
  padding: 1.6rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease, background 0.25s ease;
  transition-delay: calc(var(--i) * 0.08s);
}

.fuel-item.is-visible {
  opacity: 1;
  transform: none;
}

.fuel-item:hover {
  background: var(--bg-soft);
}

.fuel-code {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.fuel-name {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.price-note {
  margin: 1.5rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  border-left: 2px solid var(--accent);
  padding-left: 0.9rem;
}

.how {
  background: linear-gradient(180deg, rgba(18, 28, 38, 0.65), transparent);
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.step {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
  transition-delay: calc(var(--i) * 0.1s);
}

.step.is-visible {
  opacity: 1;
  transform: none;
}

.step-num {
  display: block;
  margin-bottom: 0.85rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.step-title {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
  font-weight: 700;
}

.step-text {
  margin: 0;
  color: var(--text-muted);
}

.contact {
  border-top: 1px solid var(--line);
  background:
    radial-gradient(700px 320px at 80% 0%, rgba(212, 160, 23, 0.08), transparent 60%),
    var(--bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.form-wrap {
  background: linear-gradient(160deg, rgba(24, 36, 48, 0.9), rgba(18, 28, 38, 0.75));
  border: 1px solid var(--line);
  padding: clamp(1.25rem, 3vw, 1.75rem);
}

.flash-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.flash {
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius);
  font-size: 0.92rem;
}

.flash-success {
  background: rgba(111, 191, 138, 0.12);
  border: 1px solid rgba(111, 191, 138, 0.35);
  color: #b7ebc8;
}

.flash-error {
  background: rgba(224, 112, 112, 0.12);
  border: 1px solid rgba(224, 112, 112, 0.35);
  color: #f0b0b0;
}

.form-errors {
  margin-bottom: 1rem;
  padding: 0.75rem 0.9rem;
  background: rgba(224, 112, 112, 0.12);
  border: 1px solid rgba(224, 112, 112, 0.35);
  color: #f0b0b0;
  border-radius: var(--radius);
}

.form-errors p {
  margin: 0;
}

.feedback-form {
  display: grid;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-row-contacts {
  grid-template-columns: repeat(3, 1fr);
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.field-input,
.field-select,
.field-textarea {
  width: 100%;
  min-height: 2.85rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 14, 20, 0.55);
  color: var(--text);
  font: inherit;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field-textarea {
  min-height: 7rem;
  resize: vertical;
}

.field-input:focus,
.field-select:focus,
.field-textarea:focus {
  border-color: rgba(212, 160, 23, 0.65);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.15);
}

.field-select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) calc(50% - 3px), calc(100% - 12px) calc(50% - 3px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 2rem;
}

.field-error {
  color: var(--danger);
  font-size: 0.8rem;
}

.contact-hint {
  margin: -0.25rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-submit {
  width: fit-content;
  margin-top: 0.35rem;
  border: none;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2rem;
}

.footer-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.footer-brand {
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 700;
}

.footer-note {
  color: var(--text-muted);
  font-size: 0.9rem;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes hero-drift {
  from {
    transform: scale(1.04) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.1) translate3d(-1.5%, -1%, 0);
  }
}

@media (max-width: 900px) {
  .fuel-list,
  .steps,
  .contact-grid,
  .form-row-contacts {
    grid-template-columns: 1fr 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .fuel-list,
  .steps,
  .form-row,
  .form-row-contacts {
    grid-template-columns: 1fr;
  }

  .hero-content {
    padding-bottom: 4rem;
  }

  .btn-submit {
    width: 100%;
  }
}