/* ═══════════════════════════════════════
   pellets.by — Design System
   Industrial-warm palette: anthracite + orange accent
═══════════════════════════════════════ */

/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600;700&family=Inter:wght@400;500;600&display=swap');

/* ── Design Tokens ── */
:root {
  /* Surfaces — warm charcoal & steel */
  --color-bg:             #F5F4F1;
  --color-surface:        #FAFAF8;
  --color-surface-2:      #FFFFFF;
  --color-surface-offset: #ECEAE5;
  --color-border:         #D6D3CC;
  --color-divider:        #E0DDD7;

  /* Text */
  --color-text:           #1A1916;
  --color-text-muted:     #6B6965;
  --color-text-faint:     #B5B3AE;
  --color-text-inverse:   #F5F4F1;

  /* Primary — ember orange */
  --color-primary:        #FD993A;
  --color-primary-hover:  #FEB36B;
  --color-primary-active: #BE8650;
  --color-primary-light:  #FDE8DA;

  /* Secondary — dark anthracite */
  --color-anthracite:     #1E2126;
  --color-anthracite-2:   #2D3139;
  --color-steel:          #3E444F;

  /* Type scale (fluid) */
  --text-xs:    clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:    clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base:  clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:    clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:    clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:   clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-hero:  clamp(2.5rem,   1rem    + 5vw,    5.5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:    1240px;

  /* Shape */
  --radius-sm:  0.375rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg:  0 12px 36px rgba(0,0,0,0.14);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 200ms;

  /* Fonts */
  --font-display: 'Oswald', 'Arial Narrow', sans-serif;
  --font-body:    'Inter', 'Helvetica Neue', Arial, sans-serif;
}

/* Light-only theme */

/* ── BASE RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  hanging-punctuation: first last;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s, color 0.3s;
}
img, picture, video, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.15; }
p,li,figcaption { text-wrap: pretty; max-width: 72ch; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(232,88,10,0.2); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

/* ── CONTAINER ── */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-16));
}

/* ── SECTION LABELS ── */
.section-label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-label--light { color: rgba(255,255,255,0.7); }
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
  margin-bottom: var(--space-6);
}
.section-sub {
  max-width: 65ch;
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: background var(--duration) var(--ease-out),
              color var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(232,88,10,0.35);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 6px 20px rgba(232,88,10,0.45);
}
.btn--ghost {
  background: transparent;
  color: rgba(255,255,255,0.9);
  border: 1.5px solid rgba(255,255,255,0.5);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.8);
  color: #fff;
}
.btn--sm { padding: var(--space-2) var(--space-6); font-size: var(--text-xs); }
.btn--full { width: 100%; }

/* ── HEADER ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(20,21,24,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: box-shadow 0.3s var(--ease-out);
}
.header--scrolled { box-shadow: var(--shadow-md); }
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: var(--space-8);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  text-decoration: none;
}
.logo__text {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
}
.logo__dot { color: var(--color-primary); }
.logo--footer .logo__text { color: #fff; }

/* Nav */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--duration), background var(--duration);
  white-space: nowrap;
}
.nav__link:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}
.nav__link--cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav__link--cta:hover {
  background: var(--color-primary-hover) !important;
}

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 36px;
  height: 36px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}
.burger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.35s cubic-bezier(0.16,1,0.3,1), opacity 0.3s;
  transform-origin: center;
}
/* Burger → Cross */
.burger.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.burger.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: flex;
  flex-direction: column;
  background: var(--color-anthracite);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.38s cubic-bezier(0.16,1,0.3,1), padding 0.3s ease, opacity 0.28s ease;
}
.mobile-menu.is-open {
  max-height: 520px;
  padding: var(--space-4) 0 var(--space-6);
  opacity: 1;
}
.mobile-menu__link {
  padding: var(--space-3) var(--space-8);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.8);
  opacity: 0;
  transform: translateY(-6px);
  transition: color var(--duration), background var(--duration), opacity 0.3s ease, transform 0.3s ease;
}
.mobile-menu.is-open .mobile-menu__link { opacity: 1; transform: translateY(0); }
.mobile-menu.is-open .mobile-menu__link:nth-child(1) { transition-delay: 0.06s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(2) { transition-delay: 0.12s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(3) { transition-delay: 0.18s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(4) { transition-delay: 0.24s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(5) { transition-delay: 0.30s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(6) { transition-delay: 0.36s; }
.mobile-menu__link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.mobile-menu__link--cta {
  margin: var(--space-4) var(--space-8) 0;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: #fff !important;
  text-align: center;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

/* ── HERO ── */
.hero {
  position: relative;
  min-height: clamp(520px, 85vh, 900px);
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(14,16,20,0.88) 0%,
    rgba(14,16,20,0.65) 55%,
    rgba(14,16,20,0.3) 100%
  );
}
.hero__content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-20);
  max-width: 680px;
}
.hero__badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(232,88,10,0.15);
  border: 1px solid rgba(232,88,10,0.4);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-4);
  margin-bottom: var(--space-6);
}
.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  color: #fff;
  line-height: 1.0;
  margin-bottom: var(--space-5);
  text-transform: uppercase;
}
.hero__accent { color: var(--color-primary); }
.hero__sub {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.78);
  margin-bottom: var(--space-8);
  max-width: 55ch;
  line-height: 1.55;
}
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}
.hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.hero__stat-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.hero__stat-label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ── INTRO ── */
.intro {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface);
}
.intro__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.intro__text { display: flex; flex-direction: column; gap: var(--space-4); }
.intro__text p { color: var(--color-text-muted); }
.intro__text .btn { align-self: flex-start; margin-top: var(--space-2); }
.intro__media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

/* ── ADVANTAGES ── */
.advantages {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-bg);
}
.advantages__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.adv-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: border-color var(--duration), box-shadow var(--duration), transform var(--duration);
}
.adv-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.adv-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}
.adv-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.adv-card__text { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.65; }

/* ── SPECS ── */
.specs {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-anthracite);
}

.specs .section-label { color: var(--color-primary); }
.specs .section-title,
.specs .section-sub { color: #fff; }
.specs .section-sub { color: rgba(255,255,255,0.6); }

.specs__table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  -webkit-overflow-scrolling: touch;
}
.specs__table {
  min-width: 600px;
  background: var(--color-surface-2);
  color: var(--color-text);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.specs__table thead tr {
  background: var(--color-primary);
}
.specs__table th {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fff;
  padding: var(--space-4) var(--space-5);
  text-align: left;
}
.specs__table th:not(:first-child) { text-align: center; }
.specs__table td {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text-muted);
}
.specs__table td:first-child { font-weight: 500; color: var(--color-text); }
.specs__table td:not(:first-child) { text-align: center; }
.specs__table tbody tr:last-child td { border-bottom: none; }
.specs__table tbody tr:nth-child(even) { background: var(--color-surface-offset); }
.specs__note {
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.45);
}

/* ── EQUIPMENT ── */
.equipment {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-bg);
}
.equipment__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}
.eq-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}
.eq-block__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.eq-block__badge {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
}
.eq-block__badge--base {
  background: rgba(67,122,34,0.15);
  color: #437A22;
  border: 1px solid rgba(67,122,34,0.3);
}
.eq-block__badge--opt {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid rgba(232,88,10,0.3);
}
.eq-list { display: flex; flex-direction: column; gap: var(--space-3); }
.eq-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.5;
}
.eq-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}
.eq-list--options li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: var(--space-5);
}
.eq-list--options li strong { color: var(--color-text); font-weight: 600; }
.eq-list--options li span { font-size: var(--text-xs); }

/* ── FUEL ── */
.fuel {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface);
}
.fuel__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.fuel__media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.fuel__text { display: flex; flex-direction: column; gap: var(--space-4); }
.fuel__text p { color: var(--color-text-muted); }
.fuel__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.chip {
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ── APPLICATIONS ── */
.applications {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-bg);
}
.app__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.app-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: box-shadow var(--duration), transform var(--duration);
}
.app-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.app-card__img-wrap {
  aspect-ratio: 4/3;
  overflow: hidden;
}
.app-card__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.app-card:hover .app-card__img-wrap img { transform: scale(1.04); }
.app-card__img-wrap--dark {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-anthracite-2), var(--color-steel));
}
.app-card__icon-big {
  width: 80px;
  height: 80px;
  color: rgba(255,255,255,0.55);
}
.app-card__body { padding: var(--space-6); }
.app-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.app-card__list { display: flex; flex-direction: column; gap: var(--space-2); }
.app-card__list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-4);
  position: relative;
}
.app-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* ── STEPS ── */
.steps {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface);
}
.steps__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}
.step {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  position: relative;
}
.step__num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-4);
  opacity: 0.9;
}
.step__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.step__text { font-size: var(--text-sm); color: var(--color-text-muted); }
.steps__cta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
  background: var(--color-anthracite);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.steps__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 280px;
}
.steps__cta-text {
  padding: var(--space-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.steps__cta-text h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #fff;
}
.steps__cta-text p { color: rgba(255,255,255,0.65); font-size: var(--text-sm); }
.steps__cta-text .btn { align-self: flex-start; }

/* ── CONTACT ── */
.contact {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: linear-gradient(150deg, #1A1C21 0%, #E8580A 200%);
}
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}
.contact__title { color: #fff; }
.contact__text p { color: rgba(255,255,255,0.7); font-size: var(--text-sm); }
.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-4);
}
.contact__info li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.85);
}
.contact__info svg { color: var(--color-primary); flex-shrink: 0; }

/* Form */
.contact__form {
  background: var(--color-surface-2);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  box-shadow: var(--shadow-lg);
}
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: var(--text-sm); font-weight: 500; color: var(--color-text); }
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--duration), box-shadow var(--duration);
  outline: none;
}
.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(232,88,10,0.15);
}
.form-select { cursor: pointer; }
.form-textarea { resize: vertical; min-height: 100px; }
.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  line-height: 1.5;
}
.form-link { color: var(--color-primary); text-decoration: underline; }
.form-success {
  text-align: center;
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}
.form-success svg { color: #437A22; }
.form-success h3 { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 600; }
.form-success p { color: var(--color-text-muted); font-size: var(--text-sm); }

/* ── FOOTER ── */
.footer {
  background: var(--color-anthracite);
  padding-block: var(--space-10) var(--space-8);
}
.footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.footer__brand { display: flex; flex-direction: column; gap: var(--space-3); }
.footer__tagline { font-size: var(--text-sm); color: rgba(255,255,255,0.4); }
.footer__requisites {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.footer__requisites p { font-size: var(--text-xs); color: rgba(255,255,255,0.3); max-width: none; }
.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: var(--space-6);
}
.footer__nav a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  transition: color var(--duration);
}
.footer__nav a:hover { color: rgba(255,255,255,0.9); }
.footer__copy {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.3);
}

/* ── BACK TO TOP ── */
.back-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 50;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: background var(--duration), transform var(--duration);
}
.back-top:hover { background: var(--color-primary-hover); transform: translateY(-2px); }

/* ── RESPONSIVE ── */

/* ── Tablet large (1025px and below) ── */
@media (max-width: 1025px) {
  /* Nav: hide CTA button, tighten gaps so links fit */
  .nav { gap: 0; }
  .nav__link { padding: var(--space-2) var(--space-2); font-size: 0.8rem; }
  .nav__link--cta { display: none; }

  .advantages__grid { grid-template-columns: repeat(2, 1fr); }
  .steps__grid { grid-template-columns: repeat(2, 1fr); }

  /* Reduce oversized gaps on two-column layouts */
  .intro__grid { gap: var(--space-10); }
  .fuel__grid  { gap: var(--space-10); }
  .contact__inner { gap: var(--space-10); }
}

/* ── Tablet narrow (960px and below) ── */
@media (max-width: 960px) {
  /* App grid: 2 columns instead of 3 */
  .app__grid { grid-template-columns: repeat(2, 1fr); }

  /* Equipment side-by-side still OK but tighten gap */
  .equipment__grid { gap: var(--space-6); }

  /* Steps grid: keep 2-col but tighten */
  .steps__grid { gap: var(--space-5); }
}

/* ── Mobile (768px and below) ── */
@media (max-width: 768px) {
  .nav { display: none; }
  .burger { display: flex; }

  .hero__title { font-size: clamp(2rem, 8vw, 3.5rem); }
  .hero__stats { gap: var(--space-5); }

  .intro__grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .intro__media { order: -1; }

  .advantages__grid { grid-template-columns: 1fr; }
  .equipment__grid  { grid-template-columns: 1fr; }
  .app__grid        { grid-template-columns: 1fr; }
  .fuel__grid       { grid-template-columns: 1fr; gap: var(--space-8); }

  .steps__grid { grid-template-columns: 1fr; }
  .steps__cta  { grid-template-columns: 1fr; }
  .steps__img  { min-height: 200px; }

  .contact__inner { grid-template-columns: 1fr; gap: var(--space-8); }
  .contact__text  { order: 1; }
  .contact__form  { order: 2; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
  .hero__stats { gap: var(--space-4); }
}

/* ── SCROLL ANIMATIONS ── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }