/* ============================================================
   ПРОПАН-ГАЗ — Лендинг | style.css v3.0
============================================================ */

/* --- Переменные --- */
:root {
  --clr-primary:       #1a56db;
  --clr-primary-dark:  #1140a6;
  --clr-primary-light: #3b82f6;
  --clr-primary-bg:    #eff6ff;
  --clr-accent:        #f97316;
  --clr-accent-dark:   #c2410c;
  --clr-order:         #16a34a;
  --clr-order-dark:    #15803d;
  --clr-dark:          #0f172a;
  --clr-text:          #1e293b;
  --clr-muted:         #64748b;
  --clr-border:        #e2e8f0;
  --clr-white:         #ffffff;
  --clr-bg:            #f8fafc;
  --clr-bg-alt:        #f1f5f9;
  --clr-success:       #16a34a;
  --clr-error:         #dc2626;
  --clr-warning:       #d97706;

  --font-head: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --shadow-lg: 0 10px 32px rgba(0,0,0,.12);
  --shadow-xl: 0 20px 48px rgba(0,0,0,.16);

  --header-h: 72px;
  --container-max: 1200px;
  --pad: 1.5rem;
}

/* --- Сброс --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-white);
  overflow-x: hidden;
}
body.modal-open { overflow: hidden; }
a { color: var(--clr-primary); text-decoration: none; transition: color .15s; }
a:hover { color: var(--clr-primary-dark); }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }
:focus-visible { outline: 3px solid var(--clr-accent); outline-offset: 3px; border-radius: var(--radius-sm); }

/* --- Контейнер --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* --- Заголовок секции --- */
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--clr-dark);
  margin-bottom: 1rem;
}
.section-tag {
  display: inline-block;
  background: var(--clr-primary-bg);
  color: var(--clr-primary);
  font-family: var(--font-head);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}
.section-subtitle { color: var(--clr-muted); font-size: 1.1rem; max-width: 640px; margin-inline: auto; }

/* --- Типографика --- */
.accent-text {
  background: linear-gradient(135deg, var(--clr-accent), #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.link-inline { color: var(--clr-primary); text-decoration: underline; }
.form-required { color: var(--clr-error); }

/* ============================================================
   КНОПКИ
============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.75rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background .25s, color .25s, border-color .25s, transform .15s, box-shadow .25s;
  white-space: nowrap;
  text-decoration: none;
  line-height: 1;
}
.btn:hover  { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }

.btn--primary      { background: var(--clr-primary); color: #fff; border-color: var(--clr-primary); }
.btn--primary:hover{ background: var(--clr-primary-dark); border-color: var(--clr-primary-dark); color: #fff; }

.btn--secondary      { background: var(--clr-accent); color: #fff; border-color: var(--clr-accent); }
.btn--secondary:hover{ background: var(--clr-accent-dark); border-color: var(--clr-accent-dark); color: #fff; }

.btn--outline      { background: transparent; color: #fff; border-color: rgba(255,255,255,.7); }
.btn--outline:hover{ background: rgba(255,255,255,.15); border-color: #fff; color: #fff; }

.btn--outline-dark      { background: transparent; color: var(--clr-primary); border-color: var(--clr-primary); }
.btn--outline-dark:hover{ background: var(--clr-primary); color: #fff; }

.btn--white      { background: #fff; color: var(--clr-primary); border-color: #fff; }
.btn--white:hover{ background: var(--clr-bg); color: var(--clr-primary-dark); }

.btn--outline-white      { background: transparent; color: #fff; border-color: #fff; }
.btn--outline-white:hover{ background: rgba(255,255,255,.15); }

/* Кнопка ЗАКАЗАТЬ — зелёная с пульсацией */
.btn--order {
  background: var(--clr-order);
  color: #fff;
  border-color: var(--clr-order);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 1rem 1.75rem;
  border-radius: var(--radius-lg);
  letter-spacing: .04em;
  position: relative;
}
.btn--order:hover { background: var(--clr-order-dark); border-color: var(--clr-order-dark); color: #fff; box-shadow: 0 8px 24px rgba(22,163,74,.35); }
.btn--order::after {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  animation: orderPulse 2.5s ease-in-out infinite;
}
@keyframes orderPulse {
  0%   { box-shadow: 0 0 0 0 rgba(22,163,74,.4); }
  70%  { box-shadow: 0 0 0 12px rgba(22,163,74,0); }
  100% { box-shadow: 0 0 0 0 rgba(22,163,74,0); }
}

.btn--lg   { padding: 1rem 2.25rem; font-size: 1.1rem; }
.btn--full { width: 100%; }
.btn--calc { padding: 1rem 1.75rem; font-size: 1.05rem; margin-top: .5rem; }
.btn--submit { padding: 1rem 1.75rem; font-size: 1.05rem; border-radius: var(--radius-lg); }
.btn:disabled { opacity: .6; cursor: not-allowed; transform: none !important; }

/* ============================================================
   ХЕДЕР
============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  height: var(--header-h);
  box-shadow: var(--shadow-sm);
  transition: box-shadow .25s;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
  display: flex; align-items: center;
  justify-content: space-between;
  gap: 1.5rem; height: 100%;
}
.logo { display: flex; align-items: center; gap: .5rem; text-decoration: none; flex-shrink: 0; }
.logo-icon { font-size: 1.75rem; filter: drop-shadow(0 0 6px rgba(249,115,22,.5)); }
.logo-text { font-family: var(--font-head); font-weight: 800; font-size: 1.25rem; color: var(--clr-dark); }
.logo-accent { color: var(--clr-accent); }
.header-phone {
  display: flex; align-items: center; gap: .5rem;
  font-family: var(--font-head); font-weight: 700; font-size: 1.1rem;
  color: var(--clr-primary); text-decoration: none; flex-shrink: 0;
  transition: color .15s;
}
.header-phone:hover { color: var(--clr-accent); }
.main-nav ul { display: flex; gap: 4px; align-items: center; }
.main-nav a {
  font-family: var(--font-head); font-weight: 600; font-size: .875rem;
  color: var(--clr-text); text-decoration: none;
  padding: .5rem .75rem; border-radius: var(--radius-md);
  transition: color .15s, background .15s;
}
.main-nav a:hover { color: var(--clr-primary); background: var(--clr-primary-bg); }
.burger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; background: none; border: none; cursor: pointer;
  padding: .5rem; border-radius: var(--radius-md); transition: background .15s;
}
.burger:hover { background: var(--clr-bg-alt); }
.burger span {
  display: block; width: 24px; height: 2px; background: var(--clr-dark);
  border-radius: var(--radius-full);
  transition: transform .25s, opacity .25s;
}
.burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
============================================================ */
.hero {
  position: relative; min-height: calc(100vh - var(--header-h));
  background: linear-gradient(135deg, #0b1437 0%, #1a3a7c 40%, #1e4ba3 70%, #0e2b6e 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  overflow: hidden; padding-block: 5rem;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.hero-flame { position: absolute; border-radius: 50%; filter: blur(80px); animation: flamePulse 6s ease-in-out infinite; }
.hero-flame--1 { width: 500px; height: 500px; top: -100px; right: -100px; background: radial-gradient(circle, rgba(249,115,22,.35), transparent 70%); }
.hero-flame--2 { width: 400px; height: 400px; bottom: -80px; left: -80px; background: radial-gradient(circle, rgba(26,86,219,.4), transparent 70%); animation-delay: -2s; }
.hero-flame--3 { width: 300px; height: 300px; top: 50%; left: 50%; transform: translate(-50%,-50%); background: radial-gradient(circle, rgba(245,158,11,.2), transparent 70%); animation-delay: -4s; }
@keyframes flamePulse {
  0%,100% { opacity: .8; }
  33% { opacity: 1; transform: scale(1.1); }
  66% { opacity: .6; transform: scale(.9); }
}
.hero-content {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 1.5rem; color: #fff;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  background: rgba(249,115,22,.2); border: 1px solid rgba(249,115,22,.4);
  color: #fbbf24; font-family: var(--font-head); font-weight: 600; font-size: .875rem;
  padding: .5rem 1.25rem; border-radius: var(--radius-full); letter-spacing: .04em;
}
.hero-title {
  font-family: var(--font-head); font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800; line-height: 1.2; color: #fff;
  max-width: 800px; text-shadow: 0 2px 24px rgba(0,0,0,.3);
}
.hero-subtitle { font-size: clamp(1rem, 2vw, 1.25rem); color: rgba(255,255,255,.85); max-width: 600px; }
.hero-subtitle strong { color: #fbbf24; font-weight: 700; }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.hero-stats {
  display: flex; align-items: center; gap: 1.5rem;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.15);
  backdrop-filter: blur(12px); padding: 1.25rem 2.5rem;
  border-radius: var(--radius-xl); flex-wrap: wrap; justify-content: center;
}
.stat-item { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.stat-number { font-family: var(--font-head); font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; color: #fff; line-height: 1; }
.stat-label  { font-size: .875rem; color: rgba(255,255,255,.7); font-weight: 500; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,.2); }
.hero-scroll-arrow {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,.6); animation: arrowBounce 2s ease-in-out infinite;
  transition: color .15s;
}
.hero-scroll-arrow:hover { color: #fff; }
@keyframes arrowBounce {
  0%,100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   ЦЕНЫ
============================================================ */
.prices-section { padding-block: 6rem; background: var(--clr-bg); }
.price-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem; margin-bottom: 2.5rem;
}
.price-card {
  position: relative; background: #fff; border: 2px solid var(--clr-border);
  border-radius: var(--radius-xl); padding: 2rem;
  display: flex; flex-direction: column; gap: 1.25rem;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.price-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--clr-primary-light); }
.price-card--featured { border-color: var(--clr-primary); box-shadow: 0 0 32px rgba(26,86,219,.2); }
.price-card__badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--clr-primary); color: #fff; font-family: var(--font-head);
  font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  padding: 3px 14px; border-radius: var(--radius-full); white-space: nowrap;
}
.price-card__icon  { font-size: 2.5rem; line-height: 1; }
.price-card__title { font-family: var(--font-head); font-size: 1.5rem; font-weight: 700; color: var(--clr-dark); line-height: 1.2; }
.price-card__desc  { color: var(--clr-muted); font-size: .875rem; line-height: 1.7; flex: 1; }
.price-card__prices { display: flex; flex-direction: column; gap: .5rem; border-top: 1px solid var(--clr-border); padding-top: 1.25rem; }
.price-row { display: flex; align-items: center; justify-content: space-between; gap: .75rem; padding: .5rem .75rem; border-radius: var(--radius-md); transition: background .15s; }
.price-row:hover { background: var(--clr-bg); }
.price-row--best { background: var(--clr-primary-bg); border: 1px solid rgba(26,86,219,.2); }
.price-row__vol   { font-size: .875rem; color: var(--clr-muted); font-weight: 500; }
.price-row__price { font-family: var(--font-head); font-size: 1.1rem; font-weight: 700; color: var(--clr-dark); }
.price-row--best .price-row__price { color: var(--clr-primary); }
.price-row__tag   { font-size: .75rem; font-weight: 700; color: #fff; background: var(--clr-accent); padding: 2px 8px; border-radius: var(--radius-full); }
.prices-note {
  text-align: center; color: var(--clr-muted); font-size: .875rem;
  background: #fff; border: 1px solid var(--clr-border); border-left: 4px solid var(--clr-warning);
  border-radius: var(--radius-md); padding: 1rem 1.5rem;
  max-width: 800px; margin-inline: auto; line-height: 1.7;
}
.prices-note strong { color: var(--clr-text); }

/* ============================================================
   КАЛЬКУЛЯТОР
============================================================ */
.calculator-section { padding-block: 6rem; background: linear-gradient(180deg, #fff 0%, var(--clr-bg) 100%); }

.calc-card {
  background: #fff; border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); overflow: hidden;
}
.calc-top {
  display: grid; grid-template-columns: 1fr 1fr; min-height: 520px;
}

/* Левая часть */
.calc-inputs {
  padding: 2.5rem; border-right: 1px solid var(--clr-border);
  display: flex; flex-direction: column; gap: 1.5rem;
}
.calc-field { display: flex; flex-direction: column; gap: .5rem; }
.calc-field__label {
  font-family: var(--font-head); font-size: .875rem;
  font-weight: 700; color: var(--clr-text);
}
.calc-field__hint {
  display: block; font-size: .75rem; font-weight: 400;
  color: var(--clr-muted); margin-top: 2px; font-family: var(--font-body);
}

/* Тоггл газа */
.gas-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.gas-toggle__option { position: relative; cursor: pointer; }
.gas-toggle__option input[type="radio"] { position: absolute; opacity: 0; width: 0; height: 0; }
.gas-toggle__btn {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 1rem .75rem; background: var(--clr-bg-alt);
  border: 2px solid var(--clr-border); border-radius: var(--radius-lg);
  text-align: center; cursor: pointer;
  transition: background .15s, border-color .15s, box-shadow .15s, transform .15s;
}
.gas-toggle__btn:hover { border-color: var(--clr-primary-light); background: var(--clr-primary-bg); transform: translateY(-1px); }
.gas-toggle__option input:checked + .gas-toggle__btn {
  background: var(--clr-primary-bg); border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(26,86,219,.12);
}
.gas-toggle__icon { font-size: 1.5rem; line-height: 1; }
.gas-toggle__name { font-family: var(--font-head); font-size: .875rem; font-weight: 700; color: var(--clr-dark); line-height: 1.2; }
.gas-toggle__sub  { font-size: .75rem; color: var(--clr-muted); font-weight: 500; }

/* Поля ввода */
.input-with-unit { position: relative; display: flex; align-items: center; }
.input-with-unit .form-control { padding-right: 2.5rem; }
.input-unit { position: absolute; right: 1rem; font-size: .875rem; font-weight: 600; color: var(--clr-muted); pointer-events: none; }
.form-control {
  width: 100%; padding: .75rem 1rem;
  border: 1.5px solid var(--clr-border); border-radius: var(--radius-md);
  background: #fff; color: var(--clr-text); font-size: 1rem; line-height: 1.5;
  transition: border-color .15s, box-shadow .15s;
  -webkit-appearance: none; appearance: none;
}
.form-control:focus { outline: none; border-color: var(--clr-primary); box-shadow: 0 0 0 3px rgba(26,86,219,.15); }
.form-control.is-invalid { border-color: var(--clr-error); box-shadow: 0 0 0 3px rgba(220,38,38,.1); }
.form-control::placeholder { color: var(--clr-muted); }
.form-textarea { resize: vertical; min-height: 80px; font-family: var(--font-body); }
.form-group { margin-bottom: 1rem; }
.form-label { display: block; font-family: var(--font-head); font-size: .875rem; font-weight: 600; color: var(--clr-text); margin-bottom: .5rem; }
.form-hint { font-size: .75rem; color: var(--clr-muted); margin-top: 4px; }
.field-error { display: block; font-size: .75rem; color: var(--clr-error); margin-top: 4px; font-weight: 500; }

/* Быстрые объёмы */
.quick-volumes { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .5rem; }
.qvol-btn {
  background: var(--clr-bg-alt); border: 1.5px solid var(--clr-border);
  color: var(--clr-text); font-size: .75rem; font-weight: 600;
  padding: 4px 12px; border-radius: var(--radius-full); cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.qvol-btn:hover, .qvol-btn.is-active { background: var(--clr-primary); border-color: var(--clr-primary); color: #fff; }

/* Слайдер */
.range-wrap { display: flex; align-items: center; gap: 1rem; margin-top: .5rem; }
.range-slider {
  flex: 1; -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: var(--radius-full);
  background: var(--clr-bg-alt); outline: none; cursor: pointer;
}
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--clr-primary); border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(26,86,219,.35); cursor: pointer;
  transition: transform .15s;
}
.range-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.range-slider::-moz-range-thumb {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--clr-primary); border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(26,86,219,.35); cursor: pointer;
}
.range-output {
  min-width: 52px; text-align: center; font-family: var(--font-head);
  font-weight: 700; font-size: 1.1rem; color: var(--clr-primary);
  background: var(--clr-primary-bg); border-radius: var(--radius-md);
  padding: 4px 12px;
}
.fill-liters-hint { font-size: .75rem; color: var(--clr-muted); margin-top: 4px; font-style: italic; }

/* Правая часть — результат */
.calc-result-panel {
  display: flex; flex-direction: column;
  background: var(--clr-dark);
  border-radius: 0 var(--radius-xl) var(--radius-xl) 0;
  overflow: hidden;
}
.calc-placeholder {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 1rem; padding: 2.5rem; text-align: center;
}
.calc-placeholder__icon { font-size: 4rem; opacity: .3; animation: floatIcon 3s ease-in-out infinite; }
@keyframes floatIcon { 0%,100%{ transform:translateY(0);} 50%{transform:translateY(-8px);} }
.calc-placeholder__text { font-size: 1.1rem; color: rgba(255,255,255,.3); line-height: 1.7; }

.calc-result {
  flex: 1; display: flex; flex-direction: column;
  padding: 2.5rem; gap: 1.25rem;
  animation: resultAppear .4s cubic-bezier(.34,1.56,.64,1) both;
}
@keyframes resultAppear {
  from { opacity: 0; transform: scale(.96) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.calc-result__header { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.calc-result__label { font-family: var(--font-head); font-size: .75rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.45); }
.calc-result__gas-badge { font-family: var(--font-head); font-size: .75rem; font-weight: 700; color: var(--clr-dark); background: #fbbf24; padding: 3px 10px; border-radius: var(--radius-full); white-space: nowrap; }
.calc-result__params { display: flex; flex-direction: column; gap: .75rem; }
.result-param { display: flex; align-items: center; justify-content: space-between; gap: .75rem; padding: .75rem 1rem; background: rgba(255,255,255,.06); border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,.08); }
.result-param--price { background: rgba(26,86,219,.2); border-color: rgba(26,86,219,.3); }
.result-param__name  { font-size: .875rem; color: rgba(255,255,255,.6); }
.result-param__value { font-family: var(--font-head); font-size: 1rem; font-weight: 700; color: #fff; text-align: right; }
.result-param--price .result-param__value { color: #93c5fd; }
.calc-result__divider { height: 1px; background: linear-gradient(to right, transparent, rgba(255,255,255,.2), transparent); margin: .25rem 0; }
.calc-result__total {
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg); padding: 1.25rem 1.5rem; text-align: center;
}
.calc-result__total-label { font-size: .875rem; color: rgba(255,255,255,.6); }
.calc-result__total-price {
  font-family: var(--font-head); font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800; color: #fbbf24; line-height: 1;
}
.calc-result__disclaimer { font-size: .75rem; color: rgba(255,255,255,.3); text-align: center; }

/* ============================================================
   ПРЕИМУЩЕСТВА
============================================================ */
.advantages-section { padding-block: 6rem; background: var(--clr-bg-alt); }
.adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.adv-card {
  background: #fff; border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl); padding: 2rem;
  display: flex; flex-direction: column; gap: 1rem;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--clr-primary-light); }
.adv-card__icon { width: 56px; height: 56px; flex-shrink: 0; }
.adv-card__icon svg { width: 56px; height: 56px; }
.adv-card__title { font-family: var(--font-head); font-size: 1.25rem; font-weight: 700; color: var(--clr-dark); line-height: 1.2; }
.adv-card__text  { font-size: .875rem; color: var(--clr-muted); line-height: 1.7; flex: 1; }

/* ============================================================
   CTA-БАННЕР
============================================================ */
.cta-banner {
  padding-block: 4rem;
  background: linear-gradient(135deg, var(--clr-primary-dark), var(--clr-primary), #2563eb);
}
.cta-banner__inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.cta-banner__text h2 { font-family: var(--font-head); font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; color: #fff; margin-bottom: .5rem; }
.cta-banner__text p  { color: rgba(255,255,255,.8); font-size: 1.1rem; }
.cta-banner__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ============================================================
   ФУТЕР
============================================================ */
.site-footer { background: var(--clr-dark); color: rgba(255,255,255,.75); }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; padding-block: 4rem; }
.footer-col--brand { max-width: 280px; }
.logo--footer .logo-text { color: #fff; }
.footer-desc { margin-top: 1rem; font-size: .875rem; line-height: 1.7; color: rgba(255,255,255,.5); }
.footer-col__title { font-family: var(--font-head); font-size: .875rem; font-weight: 700; color: #fff; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 1.25rem; }
.footer-contacts li { display: flex; align-items: flex-start; gap: .75rem; margin-bottom: .75rem; font-size: .875rem; }
.footer-contacts a, .footer-contacts address { color: rgba(255,255,255,.7); font-style: normal; text-decoration: none; transition: color .15s; }
.footer-contacts a:hover { color: #fff; }
.footer-nav li { margin-bottom: .75rem; }
.footer-nav a { font-size: .875rem; color: rgba(255,255,255,.65); text-decoration: none; transition: color .15s; }
.footer-nav a:hover { color: var(--clr-accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-block: 1.25rem; }
.footer-bottom__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer-bottom p { font-size: .75rem; color: rgba(255,255,255,.4); }

/* ============================================================
   КНОПКА НАВЕРХ
============================================================ */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 999;
  width: 48px; height: 48px; background: var(--clr-primary); color: #fff;
  border: none; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  cursor: pointer; box-shadow: var(--shadow-lg);
  transition: background .15s, transform .15s, box-shadow .15s;
}
.back-to-top:hover { background: var(--clr-accent); transform: translateY(-3px); box-shadow: var(--shadow-xl); }

/* ============================================================
   МОДАЛЬНОЕ ОКНО
============================================================ */
.modal-overlay {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(10,15,35,.75); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  animation: overlayIn .25s ease both;
}
@keyframes overlayIn { from{opacity:0;} to{opacity:1;} }
.modal-overlay.is-closing { animation: overlayOut .2s ease both; }
@keyframes overlayOut { from{opacity:1;} to{opacity:0;} }

.modal {
  position: relative; background: #fff;
  border-radius: var(--radius-xl); box-shadow: var(--shadow-xl), 0 0 80px rgba(26,86,219,.2);
  width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto;
  padding: 2.5rem;
  animation: modalIn .35s cubic-bezier(.34,1.56,.64,1) both;
  scrollbar-width: thin; scrollbar-color: var(--clr-border) transparent;
}
.modal::-webkit-scrollbar { width: 6px; }
.modal::-webkit-scrollbar-track { background: transparent; }
.modal::-webkit-scrollbar-thumb { background: var(--clr-border); border-radius: var(--radius-full); }
@keyframes modalIn { from{opacity:0;transform:scale(.92) translateY(24px);} to{opacity:1;transform:scale(1) translateY(0);} }
.modal-overlay.is-closing .modal { animation: modalOut .2s ease both; }
@keyframes modalOut { from{opacity:1;transform:scale(1);} to{opacity:0;transform:scale(.94) translateY(16px);} }

.modal__close {
  position: absolute; top: 1.25rem; right: 1.25rem;
  width: 36px; height: 36px; background: var(--clr-bg-alt);
  border: 1px solid var(--clr-border); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--clr-muted);
  transition: background .15s, color .15s, border-color .15s, transform .25s;
}
.modal__close:hover { background: #fee2e2; color: var(--clr-error); border-color: #fecaca; transform: rotate(90deg); }

.modal__header { display: flex; flex-direction: column; align-items: center; text-align: center; gap: .75rem; margin-bottom: 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--clr-border); }
.modal__icon { font-size: 3rem; filter: drop-shadow(0 4px 12px rgba(249,115,22,.3)); animation: iconBounce .5s cubic-bezier(.34,1.56,.64,1) .1s both; }
@keyframes iconBounce { from{transform:scale(0) rotate(-15deg);opacity:0;} to{transform:scale(1) rotate(0);opacity:1;} }
.modal__title { font-family: var(--font-head); font-size: 2rem; font-weight: 800; color: var(--clr-dark); line-height: 1.2; }
.modal__desc  { font-size: .875rem; color: var(--clr-muted); line-height: 1.7; max-width: 380px; }

.modal__summary { background: var(--clr-bg); border: 1px solid var(--clr-border); border-radius: var(--radius-lg); padding: 1.25rem; margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: .75rem; }
.modal-summary-row { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.modal-summary-row--total { padding-top: .75rem; border-top: 1px dashed var(--clr-border); }
.modal-summary__label { font-size: .875rem; color: var(--clr-muted); }
.modal-summary__value { font-family: var(--font-head); font-size: .875rem; font-weight: 700; color: var(--clr-dark); text-align: right; }
.modal-summary__value--price { font-size: 1.25rem; color: var(--clr-primary); }

.modal__form { display: flex; flex-direction: column; }
.checkbox-label { display: flex; align-items: flex-start; gap: .75rem; cursor: pointer; font-size: .875rem; color: var(--clr-muted); margin-bottom: 1.25rem; line-height: 1.7; }
.checkbox-label input[type="checkbox"] { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--clr-primary); cursor: pointer; flex-shrink: 0; }

.modal__success { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 1.25rem; padding: 1.5rem 0 1rem; animation: resultAppear .4s cubic-bezier(.34,1.56,.64,1) both; }
@keyframes resultAppear { from{opacity:0;transform:scale(.96) translateY(8px);} to{opacity:1;transform:scale(1) translateY(0);} }
.modal-success__icon  { font-size: 4rem; animation: iconBounce .6s cubic-bezier(.34,1.56,.64,1) both; }
.modal-success__title { font-family: var(--font-head); font-size: 2rem; font-weight: 800; color: var(--clr-success); line-height: 1.2; }
.modal-success__text  { font-size: 1rem; color: var(--clr-muted); line-height: 1.7; max-width: 340px; }
.modal-success__text strong { color: var(--clr-dark); }

/* ============================================================
   REVEAL АНИМАЦИИ
============================================================ */
.reveal-up { opacity: 0; transform: translateY(32px); transition: opacity .6s ease, transform .6s ease; }
.reveal-up.is-visible { opacity: 1; transform: translateY(0); }
.adv-card.reveal-up:nth-child(2) { transition-delay: .1s; }
.adv-card.reveal-up:nth-child(3) { transition-delay: .2s; }
.adv-card.reveal-up:nth-child(4) { transition-delay: .3s; }
.adv-card.reveal-up:nth-child(5) { transition-delay: .4s; }
.adv-card.reveal-up:nth-child(6) { transition-delay: .5s; }
.price-card.reveal-up:nth-child(2) { transition-delay: .15s; }
.price-card.reveal-up:nth-child(3) { transition-delay: .3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal-up, .hero-flame, .hero-scroll-arrow, .modal, .modal-overlay, .btn--order::after {
    animation: none !important; transition: none !important;
    opacity: 1 !important; transform: none !important;
  }
}

/* ============================================================
   FAQ — АККОРДЕОН
============================================================ */
.faq-section {
  padding-block: 6rem;
  background: var(--clr-white);
}

/* Список вопросов */
.faq-list {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

/* Один элемент аккордеона */
.faq-item {
  background: var(--clr-white);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color .25s, box-shadow .25s;
}
.faq-item:hover {
  border-color: var(--clr-primary-light);
  box-shadow: var(--shadow-sm);
}
/* Открытый элемент */
.faq-item.is-open {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, .08), var(--shadow-md);
}

/* Кнопка-вопрос */
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  color: var(--clr-text);
  transition: background .15s;
}
.faq-question:hover {
  background: var(--clr-bg);
}
.faq-item.is-open .faq-question {
  background: var(--clr-primary-bg);
  color: var(--clr-primary-dark);
}

/* Иконка-инфо слева */
.faq-question__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--clr-primary);
  opacity: .7;
  transition: opacity .2s;
}
.faq-item.is-open .faq-question__icon {
  opacity: 1;
}

/* Текст вопроса */
.faq-question__text {
  flex: 1;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

/* Стрелка справа */
.faq-question__arrow {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--clr-muted);
  transition: transform .3s cubic-bezier(.34, 1.56, .64, 1), color .2s;
}
.faq-item.is-open .faq-question__arrow {
  transform: rotate(180deg);
  color: var(--clr-primary);
}

/* Контейнер ответа — скрыт через height: 0 */
.faq-answer {
  height: 0;
  overflow: hidden;
  transition: height .35s cubic-bezier(.4, 0, .2, 1);
}

/* Внутренний блок с отступами */
.faq-answer__inner {
  padding: 0 1.5rem 1.5rem 3.5rem; /* отступ слева = иконка + gap */
  font-size: .9375rem;
  color: var(--clr-muted);
  line-height: 1.75;
  border-top: 1px solid var(--clr-border);
  padding-top: 1rem;
}
.faq-item.is-open .faq-answer__inner {
  border-top-color: rgba(26, 86, 219, .15);
}
.faq-answer__inner strong {
  color: var(--clr-text);
  font-weight: 600;
}
.faq-answer__inner a {
  color: var(--clr-primary);
  text-decoration: underline;
  font-weight: 500;
}

/* --- Адаптив FAQ --- */
@media (max-width: 768px) {
  .faq-section { padding-block: 4rem; }
  .faq-question { padding: 1rem 1.25rem; gap: .75rem; }
  .faq-question__text { font-size: .9375rem; }
  .faq-answer__inner { padding: .875rem 1.25rem 1.25rem 1.25rem; }
}

@media (max-width: 400px) {
  .faq-question__icon { display: none; }
  .faq-answer__inner  { padding-left: 1rem; }
}

/* ============================================================
   АДАПТИВ
============================================================ */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .footer-col--brand { max-width: 100%; }
  .header-phone { display: none; }
  .calc-top { grid-template-columns: 1fr; min-height: auto; }
  .calc-inputs { border-right: none; border-bottom: 1px solid rgba(255,255,255,.1); }
  .calc-result-panel { border-radius: 0 0 var(--radius-xl) var(--radius-xl); }
}

@media (max-width: 768px) {
  .burger { display: flex; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; border-top: 1px solid var(--clr-border);
    box-shadow: var(--shadow-lg); padding: 1.5rem;
    transform: translateY(-110%); opacity: 0;
    transition: transform .25s, opacity .25s;
    pointer-events: none;
  }
  .main-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .main-nav ul { flex-direction: column; gap: .5rem; }
  .main-nav a { display: block; padding: .75rem 1rem; font-size: 1rem; }
  .hero-stats { gap: 1rem; padding: 1rem 1.5rem; }
  .stat-divider { display: none; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .prices-section, .calculator-section, .advantages-section { padding-block: 4rem; }
  .price-cards { grid-template-columns: 1fr; }
  .calc-inputs { padding: 1.5rem; }
  .gas-toggle { grid-template-columns: 1fr 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .cta-banner__inner { flex-direction: column; text-align: center; }
  .cta-banner__actions { flex-direction: column; width: 100%; }
  .cta-banner__actions .btn { width: 100%; text-align: center; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; padding-block: 2.5rem; }
  .footer-bottom__inner { flex-direction: column; text-align: center; }
  .back-to-top { bottom: 1.25rem; right: 1.25rem; }
  .modal { padding: 1.5rem; border-radius: var(--radius-xl); }
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal { border-radius: var(--radius-xl) var(--radius-xl) 0 0; max-height: 92vh; animation: modalUp .35s cubic-bezier(.34,1.56,.64,1) both; }
  @keyframes modalUp { from{opacity:0;transform:translateY(100%);} to{opacity:1;transform:translateY(0);} }
  .modal-overlay.is-closing .modal { animation: modalDown .2s ease both; }
  @keyframes modalDown { from{opacity:1;transform:translateY(0);} to{opacity:0;transform:translateY(100%);} }
}

@media (max-width: 400px) {
  :root { --pad: 1rem; }
  .hero-stats { flex-direction: column; }
  .quick-volumes { gap: 4px; }
  .gas-toggle { grid-template-columns: 1fr; }
}

/* ============================================================
   �  � 
============================================================ */
#imageModal {
  display: none;
  position: fixed;
  z-index: 10000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.8);
  justify-content: center;
  align-items: center;
}

/* keep container flex centering, image sizing handled below */
#imageModal .modal-content {
  display: block;
  margin: auto;
}


#modalImage {
  max-width: 90vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  border-radius: 8px;
  object-fit: contain;
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  line-height: 1;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

/* ������� ����������� ������������� */
.license-image img {
  cursor: pointer;
  transition: opacity 0.3s;
}

.license-image img:hover {
  opacity: 0.8;
}