/* РетроТел — базовая стилевая система
   Ретро-винтаж: бумага, бакелит, охра, телефонный сурик */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-md: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 2px;
  --radius-md: 4px;

  --font-display: 'Playfair Display', 'Times New Roman', serif;
  --font-body: 'PT Serif', Georgia, serif;
  --font-label: 'Oswald', 'Arial Narrow', sans-serif;

  --wrap: 1180px;
  --wrap-narrow: 68ch;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

:root,
[data-theme='light'] {
  --color-bg: #f1eadc;
  --color-surface: #f7f2e6;
  --color-surface-2: #eae1cd;
  --color-surface-offset: #e2d7bf;
  --color-border: #cfc2a6;
  --color-divider: #ded2b8;

  --color-text: #241c13;
  --color-text-muted: #6d5c46;
  --color-text-faint: #9d8c74;
  --color-text-inverse: #f7f2e6;

  --color-primary: #8d3419; /* телефонный сурик */
  --color-primary-hover: #6f2712;
  --color-accent: #a7791f; /* охра */
  --color-ink: #1b1510; /* бакелит */

  --shadow-sm: 0 1px 2px rgba(43, 32, 20, 0.12);
  --shadow-md: 0 10px 30px -12px rgba(43, 32, 20, 0.35);
  --grain-opacity: 0.05;
}

[data-theme='dark'] {
  --color-bg: #17120d;
  --color-surface: #1f1811;
  --color-surface-2: #271e15;
  --color-surface-offset: #302518;
  --color-border: #453522;
  --color-divider: #3a2c1c;

  --color-text: #efe4d0;
  --color-text-muted: #b3a189;
  --color-text-faint: #7d6d58;
  --color-text-inverse: #1b1510;

  --color-primary: #d97a45;
  --color-primary-hover: #eb9160;
  --color-accent: #d9ad4f;
  --color-ink: #0f0b07;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 14px 34px -14px rgba(0, 0, 0, 0.8);
  --grain-opacity: 0.07;
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  transition:
    background-color 0.4s var(--ease),
    color 0.4s var(--ease);
}

/* Бумажная фактура */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

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

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
a:hover {
  color: var(--color-primary-hover);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.01em;
}
h1 {
  font-size: var(--text-2xl);
}
h2 {
  font-size: var(--text-xl);
}
h3 {
  font-size: var(--text-lg);
  font-family: var(--font-body);
  font-weight: 700;
  line-height: 1.25;
}
p {
  margin: 0 0 var(--space-4);
}

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

/* ---------- Утилиты ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.narrow {
  max-width: var(--wrap-narrow);
}
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-32));
  position: relative;
  z-index: 2;
}
.eyebrow {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 var(--space-4);
}
.lede {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-text-muted);
}
.muted {
  color: var(--color-text-muted);
}
.meta {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.rule {
  height: 1px;
  background: var(--color-divider);
  border: 0;
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-label);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-primary);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  transition:
    background-color 0.25s var(--ease),
    transform 0.25s var(--ease);
}
.btn:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* ---------- Хедер ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}
.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  margin-right: auto;
}
.brand__mark {
  width: 46px;
  height: 46px;
  flex: none;
  border-radius: 50%;
  box-shadow: 0 1px 0 color-mix(in srgb, var(--color-text) 18%, transparent);
}
.footer .brand__mark {
  width: 58px;
  height: 58px;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
}
.brand__sub {
  display: block;
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-top: 3px;
}
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.nav a {
  font-family: var(--font-label);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  text-decoration: none;
  padding-block: var(--space-1);
  border-bottom: 1px solid transparent;
}
.nav a:hover {
  border-bottom-color: var(--color-primary);
  color: var(--color-text);
}
.nav a[aria-current='page'] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition:
    background-color 0.25s var(--ease),
    border-color 0.25s var(--ease);
}
.icon-btn:hover {
  background: var(--color-surface-2);
  border-color: var(--color-text-muted);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
}
.nav-toggle {
  display: none;
}
[data-theme='dark'] .theme-sun {
  display: none;
}
:root:not([data-theme='dark']) .theme-moon {
  display: none;
}

@media (max-width: 860px) {
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-6);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    transform: translateY(-120%);
    transition:
      transform 0.35s var(--ease),
      visibility 0.35s var(--ease);
    visibility: hidden;
  }
  .nav[data-open='true'] {
    transform: translateY(0);
    visibility: visible;
  }
  .nav-toggle {
    display: inline-grid;
  }
  .header__inner {
    gap: var(--space-3);
  }
  .brand__sub {
    font-size: 0.58rem;
    letter-spacing: 0.14em;
  }
}

@media (max-width: 430px) {
  .brand__sub {
    display: none;
  }
}

@media (min-width: 861px) and (max-width: 1140px) {
  .brand__sub {
    display: none;
  }
  .nav {
    gap: var(--space-5);
  }
}

/* ---------- Футер ---------- */
.footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding-block: var(--space-16) var(--space-8);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-10);
}
.footer h3 {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}
.footer a {
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
}
.footer a:hover {
  color: var(--color-primary);
}
.footer__bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}
@media (max-width: 760px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* ---------- Появление при скролле ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.7s var(--ease),
    transform 0.7s var(--ease);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ---------- Общие блоки ---------- */
.page-head {
  padding-block: clamp(var(--space-12), 7vw, var(--space-24)) var(--space-10);
  border-bottom: 1px solid var(--color-divider);
  position: relative;
  z-index: 2;
}
.page-head h1 {
  max-width: 22ch;
}
.page-head .lede {
  max-width: 60ch;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}

.tag {
  display: inline-block;
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-muted);
}

[id] {
  scroll-margin-top: 92px;
}