/* Дизайн-система «Выгодный климат».
   Основа: светлый магазинный интерфейс, цвета логотипа, высокая читаемость,
   full-width desktop и отдельный mobile/tablet skeleton с нижним меню. */

:root {
  --vk-blue-900: #173b6d;
  --vk-blue-800: #1f4f8f;
  --vk-blue-600: #1c7ed6;
  --vk-blue-100: #eef7ff;
  --vk-blue-050: #f6fbff;

  --vk-orange-700: #e8590c;
  --vk-orange-600: #f76707;
  --vk-orange-500: #ff922b;
  --vk-orange-100: #fff4e6;
  --vk-orange-050: #fff9f0;

  --vk-text: #1f3552;
  --vk-muted: #617086;
  --vk-line: #dce6f0;
  --vk-bg: #ffffff;
  --vk-soft: #f5f8fb;
  --vk-card: #ffffff;

  --vk-radius: 18px;
  --vk-radius-small: 12px;
  --vk-shadow: 0 14px 42px rgba(23, 59, 109, .10);
  --vk-shadow-soft: 0 8px 28px rgba(23, 59, 109, .07);

  --vk-container: 1360px;
  --vk-header-height: 82px;
  --vk-mobile-nav-height: 74px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: Arial, "Helvetica Neue", sans-serif;
  color: var(--vk-text);
  background: var(--vk-bg);
  line-height: 1.5;
  min-width: 320px;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

.vk-page {
  width: 100%;
  overflow-x: hidden;
}

.vk-container {
  width: min(100% - 40px, var(--vk-container));
  margin: 0 auto;
}

.vk-section {
  width: 100%;
  padding: 72px 0;
}

.vk-section--soft {
  background: var(--vk-soft);
}

.vk-section--cold {
  background: linear-gradient(180deg, #f6fbff 0%, #eef7ff 100%);
}

.vk-section--warm {
  background: linear-gradient(180deg, #fffaf2 0%, #fff4e6 100%);
}

/* Шапка desktop: полноширинная, но содержимое в аккуратном контейнере. */
.vk-header {
  width: 100%;
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--vk-line);
  backdrop-filter: blur(12px);
}

.vk-header__inner {
  min-height: var(--vk-header-height);
  display: grid;
  grid-template-columns: 230px 1fr auto;
  align-items: center;
  gap: 24px;
}

.vk-logo {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.vk-logo img {
  width: 210px;
  height: auto;
  display: block;
}

.vk-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--vk-blue-900);
  font-weight: 700;
  font-size: 15px;
}

.vk-nav a {
  padding: 10px 4px;
}

.vk-nav a:hover {
  color: var(--vk-orange-700);
}

.vk-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.vk-phone {
  font-weight: 800;
  color: var(--vk-blue-900);
  white-space: nowrap;
}

.vk-icon-link {
  min-width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--vk-line);
  background: #fff;
  color: var(--vk-blue-800);
  border-radius: 999px;
  font-weight: 800;
}

.vk-button {
  border: 0;
  cursor: pointer;
  min-height: 46px;
  padding: 13px 20px;
  border-radius: 999px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
}

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

.vk-button--primary {
  background: linear-gradient(135deg, var(--vk-orange-500), var(--vk-orange-700));
  color: #fff;
  box-shadow: 0 12px 24px rgba(247, 103, 7, .20);
}

.vk-button--secondary {
  background: #fff;
  color: var(--vk-blue-900);
  border: 1px solid var(--vk-blue-600);
}

.vk-button--blue {
  background: linear-gradient(135deg, var(--vk-blue-600), var(--vk-blue-900));
  color: #fff;
  box-shadow: 0 12px 24px rgba(28, 126, 214, .18);
}

.vk-button--ghost {
  background: var(--vk-blue-100);
  color: var(--vk-blue-900);
}

.vk-hero {
  width: 100%;
  min-height: 620px;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 12% 14%, rgba(77, 171, 247, .28), transparent 30%),
    radial-gradient(circle at 88% 18%, rgba(255, 146, 43, .24), transparent 28%),
    linear-gradient(135deg, #ffffff 0%, #f6fbff 48%, #fff6ea 100%);
  border-bottom: 1px solid var(--vk-line);
}

.vk-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr);
  gap: 42px;
  align-items: center;
}

.vk-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--vk-line);
  box-shadow: var(--vk-shadow-soft);
  color: var(--vk-blue-900);
  border-radius: 999px;
  padding: 9px 14px;
  font-weight: 800;
  margin-bottom: 18px;
}

.vk-title {
  margin: 0;
  color: var(--vk-blue-900);
  font-size: clamp(38px, 4.7vw, 68px);
  line-height: 1.02;
  letter-spacing: -.04em;
}

.vk-title span {
  color: var(--vk-orange-700);
}

.vk-lead {
  margin: 22px 0 0;
  color: var(--vk-muted);
  font-size: clamp(18px, 1.45vw, 23px);
  max-width: 760px;
}

.vk-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.vk-trust-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.vk-trust-item {
  background: rgba(255,255,255,.86);
  border: 1px solid var(--vk-line);
  border-radius: var(--vk-radius-small);
  padding: 16px;
  box-shadow: var(--vk-shadow-soft);
}

.vk-trust-item strong {
  display: block;
  color: var(--vk-blue-900);
  font-size: 18px;
}

.vk-trust-item span {
  display: block;
  color: var(--vk-muted);
  font-size: 14px;
  margin-top: 3px;
}

.vk-hero-card {
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(220,230,240,.9);
  box-shadow: var(--vk-shadow);
  border-radius: 30px;
  padding: 28px;
}

.vk-hero-visual {
  position: relative;
  min-height: 430px;
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(28,126,214,.12), rgba(255,146,43,.14)),
    #fff;
  border: 1px solid var(--vk-line);
  overflow: hidden;
  display: grid;
  align-items: center;
  justify-items: center;
}

.vk-climate-mark {
  width: min(310px, 76%);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    linear-gradient(90deg, var(--vk-blue-600) 0 50%, var(--vk-orange-600) 50% 100%);
  box-shadow: 0 30px 70px rgba(23,59,109,.16);
  position: relative;
}

.vk-climate-mark::before {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  background: #fff;
  box-shadow: inset 0 0 0 12px rgba(255,255,255,.8);
}

.vk-climate-mark::after {
  content: "❄  ☀";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 54px;
  letter-spacing: 18px;
  color: #fff;
  text-shadow: 0 3px 10px rgba(0,0,0,.18);
}

.vk-floating-card {
  position: absolute;
  background: #fff;
  border: 1px solid var(--vk-line);
  border-radius: var(--vk-radius-small);
  padding: 14px 16px;
  box-shadow: var(--vk-shadow-soft);
  max-width: 210px;
}

.vk-floating-card strong {
  color: var(--vk-blue-900);
  display: block;
}

.vk-floating-card span {
  color: var(--vk-muted);
  font-size: 13px;
}

.vk-floating-card--cold {
  left: 18px;
  bottom: 28px;
}

.vk-floating-card--warm {
  right: 18px;
  top: 28px;
}

.vk-section-title {
  margin: 0;
  color: var(--vk-blue-900);
  font-size: clamp(30px, 3vw, 46px);
  line-height: 1.1;
  letter-spacing: -.03em;
}

.vk-section-subtitle {
  margin: 14px 0 0;
  color: var(--vk-muted);
  font-size: 18px;
  max-width: 820px;
}

.vk-grid {
  display: grid;
  gap: 22px;
}

.vk-grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.vk-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.vk-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.vk-card {
  background: var(--vk-card);
  border: 1px solid var(--vk-line);
  border-radius: var(--vk-radius);
  padding: 24px;
  box-shadow: var(--vk-shadow-soft);
}

.vk-card__icon {
  width: 50px;
  height: 50px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  background: var(--vk-blue-100);
  color: var(--vk-blue-900);
  font-size: 24px;
  margin-bottom: 18px;
}

.vk-card--warm .vk-card__icon {
  background: var(--vk-orange-100);
  color: var(--vk-orange-700);
}

.vk-card h3 {
  margin: 0;
  color: var(--vk-blue-900);
  font-size: 21px;
  line-height: 1.2;
}

.vk-card p {
  margin: 10px 0 0;
  color: var(--vk-muted);
}

.vk-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 30px;
}

.vk-feature-block {
  min-height: 320px;
  border-radius: 28px;
  padding: 32px;
  border: 1px solid var(--vk-line);
  box-shadow: var(--vk-shadow-soft);
  overflow: hidden;
}

.vk-feature-block--cold {
  background:
    radial-gradient(circle at 88% 18%, rgba(28,126,214,.22), transparent 32%),
    #f6fbff;
}

.vk-feature-block--warm {
  background:
    radial-gradient(circle at 88% 18%, rgba(255,146,43,.26), transparent 32%),
    #fff9f0;
}

.vk-feature-block h3 {
  margin: 0;
  font-size: 32px;
  color: var(--vk-blue-900);
}

.vk-feature-block ul {
  margin: 18px 0 0;
  padding-left: 20px;
  color: var(--vk-muted);
}

.vk-form-panel {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 26px;
  align-items: stretch;
  background: linear-gradient(135deg, var(--vk-blue-900), #1c7ed6);
  border-radius: 30px;
  padding: 28px;
  color: #fff;
  box-shadow: var(--vk-shadow);
}

.vk-form-panel h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.1;
}

.vk-form-panel p {
  color: rgba(255,255,255,.82);
  font-size: 18px;
}

.vk-form {
  background: #fff;
  border-radius: 24px;
  padding: 24px;
  color: var(--vk-text);
}

.vk-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.vk-field {
  display: grid;
  gap: 7px;
}

.vk-field label {
  font-weight: 800;
  color: var(--vk-blue-900);
  font-size: 14px;
}

.vk-field input,
.vk-field select,
.vk-field textarea {
  width: 100%;
  border: 1px solid var(--vk-line);
  border-radius: 14px;
  padding: 13px 14px;
  color: var(--vk-text);
  background: #fff;
  outline: none;
}

.vk-field input:focus,
.vk-field select:focus,
.vk-field textarea:focus {
  border-color: var(--vk-blue-600);
  box-shadow: 0 0 0 4px rgba(28,126,214,.12);
}

.vk-field--full {
  grid-column: 1 / -1;
}

.vk-form-note {
  color: var(--vk-muted);
  font-size: 13px;
  margin-top: 12px;
}

.vk-form-status {
  margin-top: 12px;
  font-weight: 800;
}

.vk-form-status--ok {
  color: #2b8a3e;
}

.vk-form-status--error {
  color: #c92a2a;
}

.vk-category-card {
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.vk-category-card small {
  color: var(--vk-muted);
}

.vk-footer {
  width: 100%;
  background: var(--vk-blue-900);
  color: #fff;
  padding: 54px 0 36px;
}

.vk-footer__grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr .9fr .9fr;
  gap: 28px;
}

.vk-footer h3 {
  margin: 0 0 12px;
}

.vk-footer p,
.vk-footer a {
  color: rgba(255,255,255,.78);
}

.vk-footer a {
  display: block;
  margin: 7px 0;
}

.vk-mobile-bottom-nav {
  display: none;
}

/* Планшет: отдельный скелет, нижняя навигация уже включается. */
@media (max-width: 1024px) {
  body {
    padding-bottom: calc(var(--vk-mobile-nav-height) + env(safe-area-inset-bottom));
  }

  .vk-container {
    width: min(100% - 28px, var(--vk-container));
  }

  .vk-header__inner {
    grid-template-columns: 190px 1fr auto;
    gap: 14px;
    min-height: 72px;
  }

  .vk-logo img {
    width: 180px;
  }

  .vk-nav {
    display: none;
  }

  .vk-phone {
    display: none;
  }

  .vk-hero {
    min-height: auto;
    padding: 54px 0;
  }

  .vk-hero__grid,
  .vk-form-panel {
    grid-template-columns: 1fr;
  }

  .vk-grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .vk-grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .vk-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .vk-mobile-bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    min-height: calc(var(--vk-mobile-nav-height) + env(safe-area-inset-bottom));
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    background: rgba(255,255,255,.98);
    border-top: 1px solid var(--vk-line);
    z-index: 100;
    box-shadow: 0 -10px 30px rgba(23,59,109,.10);
  }

  .vk-mobile-bottom-nav a {
    min-height: 58px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 3px;
    color: var(--vk-blue-900);
    font-size: 12px;
    font-weight: 800;
  }

  .vk-mobile-bottom-nav a.is-active {
    background: var(--vk-blue-100);
    color: var(--vk-blue-900);
  }

  .vk-mobile-bottom-nav span {
    font-size: 21px;
    line-height: 1;
  }
}

/* Смартфон: один столбец, крупные кнопки, удобные формы. */
@media (max-width: 640px) {
  .vk-container {
    width: min(100% - 22px, var(--vk-container));
  }

  .vk-section {
    padding: 48px 0;
  }

  .vk-header__inner {
    grid-template-columns: 1fr auto;
  }

  .vk-header-actions .vk-icon-link:nth-child(n+3),
  .vk-header-actions .vk-button {
    display: none;
  }

  .vk-logo img {
    width: 168px;
  }

  .vk-hero__actions,
  .vk-trust-row,
  .vk-split,
  .vk-grid--4,
  .vk-grid--3,
  .vk-grid--2,
  .vk-form-grid,
  .vk-footer__grid {
    grid-template-columns: 1fr;
  }

  .vk-hero__actions {
    display: grid;
  }

  .vk-button {
    width: 100%;
  }

  .vk-hero-card {
    padding: 18px;
    border-radius: 22px;
  }

  .vk-hero-visual {
    min-height: 300px;
  }

  .vk-floating-card {
    position: static;
    margin: 10px;
    max-width: none;
  }

  .vk-climate-mark {
    width: 210px;
  }

  .vk-form-panel {
    padding: 18px;
    border-radius: 24px;
  }

  .vk-form {
    padding: 18px;
  }
}