/* ============================================================
   1. CSS-переменные
   ============================================================ */
:root {
  --color-background: #f3f5ef;
  --color-surface: #ffffff;
  --color-surface-muted: #e7ede3;
  --color-primary: #263d32;
  --color-primary-dark: #182920;
  --color-secondary: #647c5c;
  --color-accent: #a9bf87;
  --color-text: #1d2822;
  --color-text-muted: #68736c;
  --color-border: #d7dfd4;
  --color-on-dark: #eef3ea;
  --color-error: #9a3b2e;

  --font-sans:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;

  --container-max: 1120px;
  --container-pad: 24px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --transition: 0.2s ease;
}

/* ============================================================
   2. Базовый сброс
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul,
ol {
  padding: 0;
}

li {
  list-style: none;
}

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

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

/* ============================================================
   3. Типографика
   ============================================================ */
h1,
h2,
h3 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-primary-dark);
}

h1 {
  font-size: clamp(2rem, 1.3rem + 3vw, 3.25rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 1.1rem + 1.8vw, 2.25rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.125rem;
}

p {
  color: var(--color-text);
}

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

.section {
  padding: 72px 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 40px;
}

.section-head h2 {
  margin-bottom: 12px;
}

.section-head p {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

/* ============================================================
   4. Layout
   ============================================================ */
.container {
  max-width: calc(var(--container-max) + var(--container-pad) * 2);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ============================================================
   5. Кнопки
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-dark);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-surface-muted);
  border-color: var(--color-secondary);
}

/* ============================================================
   6. Доступность
   ============================================================ */
:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   7. Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: rgba(243, 245, 239, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
  min-height: 72px;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-primary-dark);
}

.site-header__logo img {
  width: 36px;
  height: 36px;
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
}

.site-nav__link {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background-color var(--transition), color var(--transition);
}

.site-nav__link:hover {
  background-color: var(--color-surface-muted);
  color: var(--color-primary-dark);
}

.site-header__cta {
  margin-left: auto;
}

.site-nav + .site-header__cta {
  margin-left: 0;
}

/* Header: мобильные */
@media (max-width: 720px) {
  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
  }

  .site-nav__list {
    justify-content: center;
  }

  .site-header__cta {
    margin-left: auto;
    padding-inline: 18px;
  }
}

/* Header: узкие экраны — кнопка по центру */
@media (max-width: 480px) {
  .site-header__inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    gap: 10px;
    min-height: 0;
    padding-block: 12px;
  }

  .site-header__logo {
    justify-content: center;
  }

  .site-header__cta {
    width: 100%;
    margin-left: 0;
  }
}

/* ============================================================
   8. Hero
   ============================================================ */
.hero {
  padding: 88px 0 72px;
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px;
  align-items: center;
}

.hero__title {
  margin-bottom: 20px;
}

.hero__subtitle {
  max-width: 520px;
  margin-bottom: 32px;
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero__visual {
  margin: 0;
}

.hero__visual img {
  width: 100%;
  height: auto;
}

/* Hero: мобильные */
@media (max-width: 900px) {
  .hero {
    padding: 56px 0;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero__visual {
    max-width: 520px;
    margin-inline: auto;
  }
}

/* Hero: планшеты и средние экраны — текст и кнопки по центру */
@media (min-width: 640px) and (max-width: 900px) {
  .hero__content {
    text-align: center;
  }

  .hero__subtitle {
    margin-inline: auto;
  }

  .hero__actions {
    justify-content: center;
  }
}

/* ============================================================
   9. Карточки / Преимущества
   ============================================================ */
.features {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
}

.card__icon {
  display: inline-flex;
  padding: 12px;
  margin-bottom: 20px;
  background-color: var(--color-surface-muted);
  border-radius: var(--radius-md);
}

.card__icon img {
  width: 32px;
  height: 32px;
}

.card__title {
  margin-bottom: 10px;
}

.card__text {
  color: var(--color-text-muted);
}

/* Карточки: мобильные */
@media (max-width: 640px) {
  .features__grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   10. Как это работает
   ============================================================ */
.how__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.step__icon {
  position: relative;
  display: inline-flex;
  padding: 12px;
  margin-bottom: 20px;
  background-color: var(--color-surface-muted);
  border-radius: var(--radius-md);
}

.step__icon img {
  width: 32px;
  height: 32px;
}

.step__number {
  position: absolute;
  top: -10px;
  right: -10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-on-dark);
  font-size: 1rem;
  font-weight: 700;
}

.step__title {
  margin-bottom: 10px;
}

.step__text {
  color: var(--color-text-muted);
}

/* Шаги: планшеты и мобильные */
@media (max-width: 900px) {
  .how__steps {
    grid-template-columns: 1fr;
    max-width: 520px;
  }
}

/* ============================================================
   11. Сценарии
   ============================================================ */
.scenarios {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.scenarios__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.scenario {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-background);
  padding: 24px;
  transition: border-color var(--transition);
}

.scenario:hover {
  border-color: var(--color-accent);
}

.scenario:last-child {
  grid-column: 1 / -1;
}

.scenario__mark {
  width: 24px;
  height: 24px;
  margin-bottom: 8px;
}

.scenario__title {
  margin-bottom: 6px;
}

.scenario__text {
  color: var(--color-text-muted);
}

/* Сценарии: мобильные */
@media (max-width: 720px) {
  .scenarios__list {
    grid-template-columns: 1fr;
  }

  .scenario:last-child {
    grid-column: auto;
  }
}

/* ============================================================
   12. CTA
   ============================================================ */
.cta {
  padding: 24px 0 80px;
}

.cta__panel {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
}

.cta__title {
  color: var(--color-on-dark);
  margin-bottom: 16px;
}

.cta__text {
  max-width: 560px;
  margin: 0 auto 32px;
  color: rgba(238, 243, 234, 0.85);
  font-size: 1.0625rem;
}

.cta__btn {
  background-color: var(--color-surface);
  color: var(--color-primary-dark);
}

.cta__btn:hover {
  background-color: var(--color-accent);
}

/* CTA: мобильные */
@media (max-width: 640px) {
  .cta {
    padding: 16px 0 56px;
  }

  .cta__panel {
    padding: 40px 24px;
  }
}

/* ============================================================
   13. Форма «Подключиться»
   ============================================================ */
.connect {
  padding-top: 0;
}

.connect__panel {
  max-width: 640px;
  margin-inline: auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.connect__head {
  margin-bottom: 28px;
}

.connect__title {
  margin-bottom: 10px;
}

.connect__desc {
  color: var(--color-text-muted);
}

.connect__field {
  margin-bottom: 16px;
}

.connect__label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.connect__input {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}

.connect__input:hover {
  border-color: var(--color-secondary);
}

.connect__input[aria-invalid="true"] {
  border-color: var(--color-error);
}

.connect__error {
  margin-top: 8px;
  color: var(--color-error);
  font-size: 0.9375rem;
}

.connect__submit {
  width: 100%;
}

.connect__success {
  margin-top: 20px;
  padding: 14px 16px;
  background-color: var(--color-surface-muted);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--color-primary-dark);
}

/* Форма: мобильные */
@media (max-width: 640px) {
  .connect__panel {
    padding: 28px 20px;
  }
}

/* ============================================================
   14. Модальное окно
   ============================================================ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 20px;
}

.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(24, 41, 32, 0.55);
}

.modal__dialog {
  position: relative;
  width: 100%;
  max-width: 460px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
}

.modal__title {
  margin-bottom: 12px;
}

.modal__text {
  margin-bottom: 28px;
  color: var(--color-text-muted);
}

/* ============================================================
   15. Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(238, 243, 234, 0.8);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  justify-content: space-between;
  padding-top: 48px;
  padding-bottom: 32px;
}

.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-on-dark);
}

.site-footer__logo img {
  width: 32px;
  height: 32px;
}

.site-footer__desc {
  max-width: 320px;
  margin-top: 12px;
  font-size: 0.9375rem;
}

.site-footer__head {
  margin-bottom: 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-on-dark);
}

.site-footer__list {
  display: grid;
  gap: 8px;
}

.site-footer__plain {
  font-size: 0.9375rem;
}

.site-footer__link {
  display: inline-block;
  padding: 4px 0;
  font-size: 0.9375rem;
  transition: color var(--transition);
}

.site-footer__link:hover {
  color: var(--color-on-dark);
}


.site-footer__bottom {
  border-top: 1px solid rgba(238, 243, 234, 0.15);
  padding-top: 20px;
  padding-bottom: 24px;
}

.site-footer__copyright {
  font-size: 0.875rem;
}

.site-footer :focus-visible {
  outline-color: var(--color-accent);
}

/* ============================================================
   16. Адаптивные стили (общие)
   ============================================================ */
@media (max-width: 900px) {
  .section {
    padding: 56px 0;
  }
}

@media (max-width: 640px) {
  .container {
    padding-inline: 16px;
  }

  .section {
    padding: 44px 0;
  }

  .section-head {
    margin-bottom: 28px;
  }

  .hero {
    padding-top: 40px;
  }

  .hero__actions .btn {
    flex: 1 1 auto;
  }

  .cta__panel {
    text-align: left;
  }

  .cta__text {
    margin-inline: 0;
  }

  .cta__btn {
    width: 100%;
  }

  .site-footer__inner {
    flex-direction: column;
    gap: 28px;
  }

}