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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: inherit;
}

h1, h2, h3 {
  font-family: var(--font-display);
  margin: 0;
  font-weight: 500;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* ---------- Кнопки ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1em 2.4em;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(247, 244, 239, 0.55);
  background: rgba(20, 23, 27, 0.35);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-dark);
  text-decoration: none;
  transition: background var(--dur-base) var(--ease), color var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-text-dark);
  color: var(--color-bg-dark);
  border-color: var(--color-text-dark);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* ---------- Шапка ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  height: var(--header-height);
  display: flex;
  align-items: center;
  color: var(--color-text-dark);
  transition: color var(--dur-base) var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(20, 23, 27, 0.7);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(247, 244, 239, 0.12);
  transition: background var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.site-header[data-on-light="true"] {
  color: var(--color-text);
}

.site-header[data-on-light="true"]::before {
  background: rgba(247, 244, 239, 0.82);
  border-bottom-color: var(--color-border);
}

.site-header__inner {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.375rem;
  letter-spacing: 0.22em;
  text-decoration: none;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header__phone {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.burger {
  position: relative;
  width: 2.25rem;
  height: 1.4rem;
  padding: 0;
}

.burger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

.burger span {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease), top var(--dur-fast) var(--ease);
}

.burger span:nth-child(1) { top: 0; }
.burger span:nth-child(2) { top: 50%; margin-top: -0.5px; }
.burger span:nth-child(3) { top: 100%; margin-top: -1px; }

.burger[aria-expanded="true"] span:nth-child(1) {
  top: 50%;
  margin-top: -0.5px;
  transform: rotate(45deg);
}
.burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.burger[aria-expanded="true"] span:nth-child(3) {
  top: 50%;
  margin-top: -0.5px;
  transform: rotate(-45deg);
}

/* ---------- Полноэкранное меню ---------- */

.site-menu {
  position: fixed;
  inset: 0;
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-dark);
  color: var(--color-text-dark);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease), visibility 0s linear var(--dur-base);
}

.site-menu.is-open {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur-base) var(--ease);
}

.site-menu__close {
  position: absolute;
  top: 1.6rem;
  right: var(--gutter);
  font-size: 1.75rem;
  font-weight: 300;
  line-height: 1;
  width: 2.5rem;
  height: 2.5rem;
}

.site-menu__close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: center;
}

.site-menu__list a {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 6vw, 3.25rem);
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.005em;
  transition: color var(--dur-fast) var(--ease);
}

.site-menu__list a:hover,
.site-menu__list a:focus-visible {
  color: var(--color-accent);
}

/* ---------- Общие блоки-экраны ---------- */

.screen {
  position: relative;
  min-height: 100vh;
  display: flex;
}

.screen--light {
  background: var(--color-bg);
  color: var(--color-text);
  padding-top: var(--header-height);
}

.screen--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-dark);
  padding-top: var(--header-height);
}

.reveal {
  opacity: 0;
  transform: translateY(0.9rem);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Футер ---------- */

.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-text-muted-dark);
  padding: var(--space-lg) var(--gutter);
  font-size: 0.875rem;
}

.site-footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-dark);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  align-items: baseline;
}

.site-footer address {
  font-style: normal;
}

.site-footer a {
  text-decoration: none;
  color: var(--color-text-dark);
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--color-accent);
}

.site-footer__legal {
  flex-basis: 100%;
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  color: var(--color-text-muted-dark);
}

/* ---------- Ссылка на следующую страницу ---------- */

.next-page {
  background: var(--color-bg);
  padding: var(--space-lg) var(--gutter);
  text-align: center;
}

.next-page__link {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.2em;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.next-page__link:hover,
.next-page__link:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}