/* chernaya.me — native CSS */
:root {
  --color-primary: #1f4d8f;
  --color-primary-soft: #6283b0;
  --color-beige: #f7f6f1;
  --font-sans: "Nunito Sans", sans-serif;
  --section-pad-x: clamp(22px, 5vw, 78px);
  --section-pad-y: clamp(48px, 7vw, 80px);
  --nav-gap: clamp(22px, 3vw, 49px);
  --header-h: 88px;
  --three-column-grid: repeat(3, minmax(0, 1fr));
}

/* Modern CSS reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  font-family: var(--font-sans);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  text-wrap: pretty;
  letter-spacing: -0.025em;
}

body {
  font-size: 16px;
  min-height: 100vh;
  background: var(--color-beige);
  color: var(--color-primary);
  font-family: var(--font-sans);
  line-height: 1.3667;
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeSpeed;
}

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

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

button {
  background: none;
  border: 0;
  cursor: pointer;
}

ul[role='list'],
ol[role='list'] {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: inherit;
}

:where(:focus-visible) {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

/* Fixed frame: the border stays visible while all content scrolls inside it */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  border: 2px solid var(--color-primary);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: var(--three-column-grid);
  align-items: stretch;
  background: color-mix(in oklab, var(--color-beige) 80%, transparent);
  border-bottom: 2px solid var(--color-primary);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-left {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: 25px;
}

.header-right {
  grid-column: span 2;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--nav-gap);
  padding: 25px var(--section-pad-x);
  border-left: 2px solid var(--color-primary);
}

.wordmark {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px 0 8px 12px;
  color: var(--color-primary);
}

.menu-line {
  width: 25px;
  height: 1px;
  background: currentColor;
  transition: transform .25s ease;
}

.menu-toggle[aria-expanded="true"] .menu-line:first-of-type {
  transform: translateY(3.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-line:last-of-type {
  transform: translateY(-3.5px) rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--nav-gap);
  font-size: 15px;
}

.site-nav a {
  position: relative;
  padding-block: 4px;
}

.site-nav a:not(.nav-contact)::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: currentColor;
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .25s ease;
}

.site-nav a:not(.nav-contact):hover::after,
.site-nav a:not(.nav-contact).is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-contact {
  border: 1px solid var(--color-primary);
  padding: 9px 14px;
}

.nav-contact:hover {
  background: var(--color-primary);
  color: var(--color-beige);
}

main section[id] {
  scroll-margin-top: var(--header-h);
}

#about {
  display: flex;
  border-bottom: 2px solid var(--color-primary);
}

#about>img {
  width: 33.333%;
  object-fit: cover;
}

#about>div {
  flex: 1;
  display: flex;
  align-items: center;
  border-left: 2px solid var(--color-primary);
  padding: var(--section-pad-y) var(--section-pad-x);
}

#requests {
  border-bottom: 2px solid var(--color-primary);
}

.section-heading {
  padding: var(--section-pad-y) var(--section-pad-x);
  border-bottom: 2px solid var(--color-primary);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-align: center;
}

.requests-grid {
  display: grid;
  grid-template-columns: var(--three-column-grid);
}

.requests-grid > .col {
  flex: 1 1 0;
  min-width: 0;
  padding: var(--section-pad-y) var(--section-pad-x);
}

.requests-grid > .col + .col {
  border-left: 2px solid var(--color-primary);
}

.requests-illustration {
  width: 150px;
  margin: 0 auto 2rem auto;
}

.col-title {
  margin-bottom: 1.2rem;
  font-size: clamp(1.15rem, 1.6vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.req-list {
  list-style: none;
  display: grid;
  gap: 0.65rem;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.req-list > li {
  position: relative;
  padding-left: 1.1em;
}

.req-list > li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--color-primary-soft);
}

.requests-note {
  padding: var(--section-pad-y) var(--section-pad-x);
  border-top: 2px solid var(--color-primary);
  font-size: 1.1rem;
  line-height: 1.4;
}

.note-mark {
  color: var(--color-primary-soft);
  font-weight: 700;
}

#approach {
  display: grid;
  place-items: center;
  padding: var(--section-pad-y) var(--section-pad-x);
}

.section-rule {
  border-bottom: 2px solid var(--color-primary);
}

.blank-section {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.section-placeholder {
  color: var(--color-primary-soft);
  font-size: clamp(20px, 2.5vw, 34px);
  font-weight: 600;
}

.prose-block {
  max-width: 64ch;
  margin-inline: auto;
  display: grid;
  gap: 1rem;
  font-size: 1.333rem;
}

@media (max-width: 700px) {
  .site-header {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .header-left {
    padding-block: 21px;
  }

  .header-right {
    padding-block: 21px;
  }

  .wordmark,
  .menu-toggle {
    position: relative;
    z-index: 2;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 1;
    flex-direction: column;
    align-items: flex-start;
    gap: 25px;
    padding: 105px 22px 44px;
    background: var(--color-beige);
    font-size: 27px;
    transform: translateX(100%);
    transition: transform .3s ease;
  }

  .site-nav.is-open {
    transform: translateX(0);
  }

  .nav-contact {
    margin-top: 15px;
    font-size: 18px;
  }
}

@media (max-width: 767px) {

  #about>div,
  #approach {
    padding: 80px 48px;
  }

  .requests-grid {
    grid-template-columns: 1fr;
  }

  .requests-grid > .col + .col {
    border-left: 0;
    border-top: 2px solid var(--color-primary);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
  }
}