/* ============================================================
   ПЕРЕМЕННЫЕ И БАЗОВЫЕ СТИЛИ
   ============================================================ */
:root {
  /* Цвета из макета */
  --color-primary: #2B7CDB;
  --color-primary-dark: #1a5fb0;
  --color-navy: #052B4E;
  --color-navy-light: #0A3D6E;
  --color-bg-light: #D8EAF8;
  --color-bg-card: #E0F0FC;
  --color-white: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-muted: #5A6A7A;
  --color-text-light: #8A9BB0;
  --color-border: #C5D9ED;
  --color-green: #22A06B;
  --color-green-status: #4ADE80;

  /* Типографика и отступы */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container-width: 680px;
  --container-wide: 960px;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --shadow-sm: 0 2px 8px rgba(5, 43, 78, 0.06);
  --shadow-md: 0 4px 20px rgba(5, 43, 78, 0.1);
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* Контейнер — ограничивает ширину контента */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================================
   ТИПОГРАФИКА СЕКЦИЙ
   ============================================================ */
.section-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  line-height: 1.5;
}

.text-accent {
  color: var(--color-primary);
}

/* ============================================================
   КНОПКИ
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: 2px solid transparent;
  border-radius: 50px;
  padding: 12px 24px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  background: rgba(43, 124, 219, 0.05);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
}

.btn--sm {
  font-size: 13px;
  padding: 8px 16px;
}

.btn--lg {
  font-size: 16px;
  padding: 16px 28px;
}

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

/* ============================================================
   ШАПКА
   ============================================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.header__nav {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* Логотип */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: 0.02em;
}

.logo__subtitle {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

/* ============================================================
   ГЛАВНЫЙ ЭКРАН (HERO)
   ============================================================ */
.hero {
  padding: 32px 0 48px;
}

.hero__title {
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-navy);
  margin-bottom: 16px;
}

.hero__text {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  line-height: 1.6;
}

.hero__actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 36px;
}

.hero__actions .btn--primary {
  grid-column: 1 / -1;
}

.hero__actions .btn--full {
  grid-column: 1 / -1;
}

/* Статистика */
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 24px;
  margin-bottom: 32px;
}

.stats__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stats__value {
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.2;
}

.stats__label {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.4;
}

/* Карточка диагностики */
.diagnostic-card {
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  border-radius: var(--radius-xl);
  padding: 24px;
  color: var(--color-white);
}

.diagnostic-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.diagnostic-card__label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  opacity: 0.7;
}

.diagnostic-card__status {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-green-status);
  letter-spacing: 0.05em;
}

.diagnostic-card__gauge {
  position: relative;
  width: 180px;
  height: 180px;
  margin: 0 auto 24px;
}

.gauge {
  width: 100%;
  height: 100%;
}

.diagnostic-card__temp {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
}

.diagnostic-card__value {
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 6px;
}

.diagnostic-card__desc {
  font-size: 12px;
  opacity: 0.7;
  line-height: 1.3;
}

.diagnostic-card__footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.diagnostic-card__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.diagnostic-card__info strong {
  font-size: 18px;
  font-weight: 700;
}

.diagnostic-card__info span {
  font-size: 12px;
  opacity: 0.65;
}

/* ============================================================
   БЛОК ПОДСКАЗОК (АККОРДЕОН)
   ============================================================ */
.tips {
  padding: 48px 0;
  background: var(--color-white);
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.accordion__item {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.accordion__item.is-open {
  box-shadow: var(--shadow-sm);
}

.accordion__trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 20px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}

.accordion__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.accordion__content-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.accordion__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-navy);
  line-height: 1.3;
}

.accordion__hint {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.accordion__chevron {
  transition: transform var(--transition);
}

.accordion__item.is-open .accordion__chevron {
  transform: rotate(180deg);
}

.accordion__panel {
  padding: 0 20px 20px 78px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.accordion__panel ul {
  list-style: disc;
  padding-left: 18px;
}

.accordion__panel li + li {
  margin-top: 6px;
}

/* CTA «Другая проблема» */
.tips-cta {
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  color: var(--color-white);
  margin-top: 12px;
}

.tips-cta__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.tips-cta__text {
  font-size: 14px;
  opacity: 0.8;
  margin-bottom: 20px;
  line-height: 1.5;
}

/* ============================================================
   О МАСТЕРЕ
   ============================================================ */
.about {
  padding: 48px 0;
  background: var(--color-bg-light);
}

.about__text {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.65;
}

.checklist {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.checklist__item {
  position: relative;
  padding-left: 32px;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.5;
}

.checklist__item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 3px;
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

/* ============================================================
   ПРАЙС-ЛИСТ
   ============================================================ */
.pricing {
  padding: 48px 0;
  background: var(--color-white);
}

.price-card {
  border: 3px solid var(--color-navy);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  background: var(--color-white);
}

.price-list {
  display: flex;
  flex-direction: column;
}

.price-list__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--color-border);
}

.price-list__item:last-child {
  border-bottom: none;
}

.price-list__name {
  font-size: 14px;
  color: var(--color-text);
  flex-shrink: 0;
  max-width: 65%;
  line-height: 1.4;
}

.price-list__dots {
  flex: 1;
  border-bottom: 1px dotted var(--color-border);
  min-width: 12px;
  align-self: flex-end;
  margin-bottom: 4px;
}

.price-list__price {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.price-list__price--free {
  color: var(--color-green);
}

.price-card__footer {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.price-card__note {
  font-size: 12px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.price-card__footer .btn {
  align-self: flex-start;
}

/* ============================================================
   ОТЗЫВЫ
   ============================================================ */
.reviews {
  padding: 48px 0;
  background: var(--color-bg-light);
}

.reviews__list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.review-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.review-card__stars {
  display: flex;
  gap: 2px;
  margin-bottom: 14px;
}

.review-card__text {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 16px;
}

.review-card__author {
  display: block;
  font-size: 13px;
  color: var(--color-text-light);
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

.btn--reviews {
  display: block;
  width: 100%;
  max-width: 280px;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

/* Скрытые отзывы (показываются по кнопке) */
.review-card.is-hidden {
  display: none;
}

.reviews.is-expanded .review-card.is-hidden {
  display: block;
}

/* ============================================================
   CTA-БАННЕР
   ============================================================ */
.cta-banner {
  padding: 0 20px 48px;
  background: var(--color-bg-light);
}

.cta-banner__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  text-align: center;
  color: var(--color-white);
}

.cta-banner__title {
  font-size: clamp(22px, 5vw, 28px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.cta-banner__text {
  font-size: 15px;
  opacity: 0.85;
  margin-bottom: 28px;
  line-height: 1.5;
}

.cta-banner__actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.cta-banner__actions .btn {
  width: 100%;
  max-width: 320px;
}

/* ============================================================
   ПОДВАЛ
   ============================================================ */
.footer {
  background: var(--color-bg-light);
  padding: 48px 0 32px;
}

.footer__top {
  margin-bottom: 32px;
}

.footer__brand {
  margin-bottom: 32px;
}

.footer__desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: 16px;
  line-height: 1.6;
  max-width: 360px;
}

.footer__columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.footer__heading {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.footer__links li + li {
  margin-top: 8px;
}

.footer__links a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer__links a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer__bottom p {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ============================================================
   АДАПТИВ: ПЛАНШЕТЫ И ДЕСКТОП
   ============================================================ */
@media (min-width: 600px) {
  .container {
    max-width: var(--container-wide);
    padding: 0 32px;
  }

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

  .hero__actions .btn--primary {
    grid-column: auto;
  }

  .hero__actions .btn--full {
    grid-column: auto;
    width: auto;
  }

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

  .diagnostic-card {
    padding: 32px 36px;
  }

  .diagnostic-card__gauge {
    width: 200px;
    height: 200px;
  }

  .accordion__panel {
    padding-left: 94px;
  }

  .price-card {
    padding: 32px 36px;
  }

  .price-list__name {
    font-size: 15px;
    max-width: none;
  }

  .price-list__price {
    font-size: 15px;
  }

  .price-card__footer {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .price-card__note {
    max-width: 60%;
  }

  .reviews__list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .review-card__author {
    margin-top: auto;
  }

  .review-card {
    display: flex;
    flex-direction: column;
    height: 100%;
  }

  .cta-banner__actions {
    flex-direction: row;
    justify-content: center;
  }

  .footer__top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    align-items: start;
  }

  .footer__columns {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .hero {
    padding: 48px 0 64px;
  }

  .hero__inner-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
  }

  .tips,
  .about,
  .pricing,
  .reviews {
    padding: 64px 0;
  }

  .header__nav .btn--sm {
    padding: 10px 20px;
  }
}

/* Мобильная шапка: уменьшаем кнопки на узких экранах */
@media (max-width: 480px) {
  .header__nav {
    gap: 6px;
  }

  .header__nav .btn--sm {
    font-size: 12px;
    padding: 8px 12px;
  }
}