@font-face {

  font-family: Montserrat;

  src: url('assets/fonts/Montserrat-Variable.ttf') format('truetype');

  font-weight: 100 900;

  font-display: swap;

}

:root {

  --sand: #f1e4d6;

  --sand-light: #f8f0e7;

  --sand-accent: #ead3be;

  --ink: #000;

  --copper: #a4511d;

  --line: #c7b5a3;

  --content-width: 93.75rem; /* 1500px: поля по 210px на экране 1920px */

  --gutter: clamp(1rem, 10.9375vw, 13.125rem);

}

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

html { scroll-padding-block-start: calc(var(--sticky-header-height, 7rem) + 1rem); scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body { margin: 0; min-inline-size: 0; background: var(--sand); color: var(--ink); font-family: Arial, Helvetica, sans-serif; -webkit-font-smoothing: antialiased; }

a { color: var(--ink); text-decoration: none; }
a:hover, button:hover { text-decoration: none; }

button { font: inherit; color: var(--ink); cursor: pointer; border: 0; background: none; }

a, button { touch-action: manipulation; -webkit-tap-highlight-color: transparent; }

a:focus-visible, button:focus-visible { outline: 3px solid var(--copper); outline-offset: 5px; }

[hidden] { display: none !important; }

.shell { inline-size: min(calc(100% - 2 * var(--gutter)), var(--content-width)); margin-inline: auto; min-inline-size: 0; }

.landing { display: flex; flex-direction: column; min-block-size: 100svh; }

.header-band { position: sticky; inset-block-start: 0; z-index: 30; background: var(--sand-light); border-block-end: 1px solid var(--theme-border, #dbc7b4); box-shadow: 0 3px 18px var(--theme-shadow, #70451b06); }

.header { --header-menu-size: clamp(1.125rem, 1.3vw, 1.375rem); display: flex; align-items: center; justify-content: space-between; min-block-size: 4.75rem; gap: 1rem; padding: .6rem 0; }

.logo { display: inline-flex; align-items: baseline; flex-shrink: 0; gap: .12em; font-family: Montserrat, Arial, sans-serif; font-weight: 900; font-size: clamp(1.875rem, 2.6vw, 2.75rem); line-height: 1; letter-spacing: -.065em; white-space: nowrap; }

.logo span { display: block; }

.logo-dot { display: block; inline-size: .28em; block-size: .28em; flex-shrink: 0; margin-inline-start: -.1em; margin-inline-end: .1em; border-radius: 50%; background: var(--theme-accent, #8b573b); }

nav { display: flex; flex-wrap: wrap; align-items: center; gap: clamp(.75rem, 1.2vw, 1.5rem); }

.header .header-nav > a, .header .header-nav > button:not(.theme-toggle), .header .header-nav .ac-nav-button { font-family: Arial, sans-serif; font-size: var(--header-menu-size); font-weight: 400; letter-spacing: -.04em; line-height: 1.25; }

nav > a, nav > button:not(.outline):not(.theme-toggle) { padding-block: .3rem; }

nav > a:hover, nav > button:hover { color: var(--ink); }

.outline { border: 1px solid var(--theme-border, #d17d3d); border-radius: 3rem; padding: .6rem 1.3rem; line-height: 1.1; }

.outline:hover { background: var(--sand-accent); }

.menu-toggle { display: none; }

.hero-copy { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: start; gap: clamp(2rem, 3.5vw, 4rem); padding: clamp(4rem, 6vw, 7rem) 0 1.5rem; }

.hero-intro { min-inline-size: 0; margin-block-start: -2.75rem; }

.hero-benefits { display: grid; gap: 1rem; margin: clamp(2.75rem, 3.3vw, 3.75rem) 0 0; padding: 0; list-style: none; }

.hero-benefits li { display: flex; align-items: center; gap: 1rem; font-size: clamp(1.125rem, 1.3vw, 1.5rem); line-height: 1.35; }

.hero-benefits li::before { content: '✓'; flex: 0 0 auto; color: var(--ink); font-weight: 600; line-height: 1; }

.hero-benefits span { min-inline-size: 0; }

.teacher-visual { position: relative; isolation: isolate; display: grid; justify-items: center; align-self: start; justify-self: end; inline-size: 100%; max-inline-size: 36rem; margin: 0 0 4rem; transform: translateX(calc(-7% - 1.3rem)); }

.teacher-disc { position: absolute; z-index: -1; inset-inline: 0; inset-block-end: 0; aspect-ratio: 1.3; border-radius: 50%; transform: scale(1.14); transform-origin: center; background-color: var(--theme-board, #dfbea1); background-image: linear-gradient(var(--theme-board-line, #a6734424) 1px, transparent 1px), linear-gradient(90deg, var(--theme-board-line, #a6734424) 1px, transparent 1px); background-size: 1.5rem 1.5rem; background-position: center; }

.teacher-disc::after { content: ''; position: absolute; inset: -1.125rem; border: 1px solid var(--theme-border, #c59b784d); border-radius: inherit; }

.teacher-name { position: absolute; z-index: 0; color: #805033; font-family: 'Segoe Script', 'Segoe Print', cursive; font-size: clamp(1.25rem, 2vw, 2.25rem); line-height: 1.4; white-space: nowrap; transform: translateX(-50%) rotate(-6deg); }

.teacher-name--woman { inset-inline-start: 25%; inset-block-start: 8%; }

.teacher-name--man { inset-inline-start: 67%; inset-block-start: 0%; transform: translateX(-50%); }

.teacher-portraits { display: flex; inline-size: 100%; aspect-ratio: 1.28; }

.teacher-person { position: relative; flex: 1 1 0; min-inline-size: 0; overflow: hidden; }

.teacher-person:first-child { z-index: 1; }

.teacher-person--man { margin-inline-start: -12%; transform: translateX(-6%); }

.teacher-portrait { position: absolute; inset-block-end: 0; inset-inline-start: 50%; display: block; block-size: 100%; inline-size: auto; max-inline-size: none; transform: translateX(-50%); object-fit: contain; }

.teacher-person--woman .teacher-portrait { block-size: 84%; }

.teacher-person--man .teacher-portrait { block-size: 106.7%; inset-block-end: -12.00375%; clip-path: inset(0 0 11.25% 0); }

.teacher-caption { position: absolute; z-index: 2; inset-inline-start: 50%; inset-block-start: 100%; display: flex; align-items: center; justify-content: center; gap: .625rem; inline-size: 80%; min-block-size: 3.75rem; max-inline-size: calc(100% - 1rem); padding: .875rem 1.25rem; border: 1px solid var(--theme-border, #d8bda5); border-radius: 1rem; background: var(--sand-light); box-shadow: 0 .5rem 1.5rem var(--theme-shadow, #70451b12); font-size: clamp(.875rem, 1vw, 1rem); font-weight: 600; text-align: center; transform: translateX(-50%); }

.teacher-caption span { color: var(--ink); }

.hero h1 { max-inline-size: 57rem; margin: 0; font-size: clamp(2.25rem, 3.3vw, 3.75rem); font-weight: 800; line-height: 1.02; letter-spacing: -.038em; overflow-wrap: anywhere; }

.hero-intro > p { max-inline-size: 50rem; margin: 1.35rem 0 0; font-size: clamp(1.25rem, 1.6vw, 1.75rem); line-height: 1.2; letter-spacing: -.035em; overflow-wrap: anywhere; }

.course-section { padding-block-end: 3rem; scroll-margin-block-start: 2rem; }

.course-section-title { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1rem; margin: 0 0 1.5rem; font-size: clamp(1.75rem, 1.9vw, 2.125rem); font-weight: 750; line-height: 1.1; letter-spacing: -.03em; }

.course-section-title span { padding: .45em .9em; border: 1px solid var(--theme-border, #d8bda5); border-radius: 2rem; color: var(--ink); font-size: 1rem; font-weight: 500; letter-spacing: 0; }

.subjects { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-rows: 1fr; gap: 1.25rem; }

.subject { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 1rem; align-items: start; min-inline-size: 0; padding: 1.5rem; text-align: start; border: 1px solid var(--theme-border, #d8bda5); border-radius: 1.25rem; background: var(--sand-light); box-shadow: 0 .5rem 1.5rem var(--theme-shadow, #70451b08); transition: border-color .15s, box-shadow .15s; }

.subject:hover { border-color: var(--theme-border, #ba8a63); box-shadow: 0 .6rem 1.8rem var(--theme-shadow, #70451b12); }

.subject-icon { display: grid; place-items: center; inline-size: clamp(4rem, 5vw, 5rem); aspect-ratio: 1; border-radius: 50%; background: var(--sand-accent); }

.subject-icon svg { display: block; inline-size: 88%; block-size: 88%; fill: none; stroke: url('#copper'); stroke-width: 3.5; stroke-linecap: round; stroke-linejoin: round; }

.physics-icon circle { fill: url('#copper'); stroke-width: 1; }

.subject[data-subject="physics-oge"] .subject-icon svg { inline-size: 72%; block-size: 72%; transform: translateY(7%); }

.subject-copy { container-type: inline-size; display: flex; flex-direction: column; min-inline-size: 0; padding-block-start: .35rem; }

.subject-copy strong { display: flex; flex-wrap: wrap; align-items: center; gap: .4em; font-size: clamp(1.125rem, 1.25vw, 1.375rem); font-weight: 750; line-height: 1.15; letter-spacing: -.04em; overflow-wrap: anywhere; }

.subject-copy > span { margin-block-start: .3rem; font-size: 1.125rem; font-weight: 400; line-height: 1.45; letter-spacing: 0; color: var(--ink); overflow-wrap: normal; text-wrap: pretty; }

.course-description { display: block; text-wrap: balance; }

.subject-copy b { display: block; white-space: nowrap; margin-block-start: .35rem; font-size: clamp(.875rem, 8cqi, 1.25rem); line-height: 1.2; font-weight: 750; color: var(--ink); }

.subject-copy small { padding: .35em .8em; border-radius: 2rem; background: var(--theme-tint, #e9cdb5); color: var(--ink); font-size: .48em; white-space: nowrap; }

.arrow { align-self: center; font-family: Arial, sans-serif; font-size: 2.4rem; line-height: 1; transition: transform .15s; }

.subject:hover .arrow { transform: translateX(4px); }

.course-pending { align-self: center; justify-self: center; inline-size: 1.5rem; aspect-ratio: 1; border: 2px solid var(--ink); border-inline-end-color: transparent; border-radius: 50%; transform: rotate(-35deg); }

.subject:hover strong { color: var(--ink); }

.site-footer { margin-block-start: auto; border-block-start: 1px solid var(--theme-border, #dbc7b4); background: var(--sand-light); }

.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 2rem; padding-block: 1.25rem; color: var(--ink); font-size: 1rem; }

.footer-brand { font-family: Montserrat, Arial, sans-serif; font-weight: 800; font-size: 1.125rem; letter-spacing: -.05em; color: var(--ink); white-space: nowrap; }

.footer-brand span { display: inline-block; inline-size: .28em; block-size: .28em; margin-inline: .02em .14em; border-radius: 50%; background: var(--theme-accent, #8b573b); }

.footer-description { margin-inline-end: auto; }

.skip { position: fixed; inset-block-start: -100px; inset-inline-start: 1rem; z-index: 10; padding: 1rem; background: var(--sand-light); }

.skip:focus { inset-block-start: 1rem; }

.eyebrow { color: var(--ink); font-size: .75rem; font-weight: 700; letter-spacing: .125rem; }

dialog { inline-size: min(31.25rem, calc(100% - 2rem)); max-inline-size: calc(100% - 2rem); max-block-size: calc(100dvh - 2rem); overflow: auto; padding: clamp(1.5rem, 4vw, 2.625rem); border: 1px solid var(--line); border-radius: 1.25rem; background: var(--sand-light); color: var(--ink); box-shadow: 0 2rem 6rem var(--theme-shadow, #34201326); overflow-wrap: anywhere; }

dialog::backdrop { background: var(--theme-backdrop, #34231855); backdrop-filter: blur(5px); }

.close-dialog { position: absolute; inset-inline-end: 1rem; inset-block-start: .5rem; font-size: 2rem; color: var(--ink); }

dialog h2 { margin-block: 1rem; font-size: 1.75rem; letter-spacing: -.03em; }

dialog p { font-size: 1.25rem; color: var(--ink); line-height: 1.6; }

.solid { margin-block-start: 1rem; border-radius: 2rem; padding: .8rem 1.5rem; background: var(--theme-button, #ead3be); color: var(--ink); font-size: 1.125rem; }

.solid:hover { background: var(--theme-tint, #dfc1a5); }

@media (max-width: 90rem) {

  .subjects { grid-template-columns: repeat(2, minmax(0, 1fr)); }

}

@media (max-width: 1600px) {
  .header, .academy .header { --header-menu-size: 1rem; position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; min-block-size: 4.5rem; padding-block: .6rem; gap: .5rem 1rem; }
  .logo { font-size: clamp(1.5rem, 4.4vw, 2.75rem); }
  .menu-toggle, .academy .ac-header-toggle { display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 7px; inline-size: 2.75rem; block-size: 2.75rem; border-radius: .65rem; }
  .menu-toggle:hover { background: var(--sand-accent); }
  .menu-toggle span { inline-size: 1.625rem; block-size: 2px; background: var(--ink); }
  .menu-toggle[aria-expanded=true] span:first-child { transform: translateY(4.5px) rotate(45deg); }
  .menu-toggle[aria-expanded=true] span:last-child { transform: translateY(-4.5px) rotate(-45deg); }
  #navigation, .header .ac-nav { position: absolute; z-index: 40; inset-block-start: calc(100% + .5rem); inset-inline: 0; display: none; flex-direction: column; align-items: stretch; flex-wrap: nowrap; gap: .25rem; max-block-size: calc(100dvh - 6rem); overflow-y: auto; overscroll-behavior: contain; padding: .65rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--sand-light); box-shadow: 0 .75rem 2rem var(--theme-shadow, #30251d20); }
  #navigation.open, .header .ac-nav.is-open { display: flex; }
  #navigation > a, #navigation > button, .ac-nav > a, .ac-nav > button, .academy .ac-nav-button { display: flex; align-items: center; justify-content: start; inline-size: 100%; min-block-size: 2.75rem; padding: .65rem .8rem; border: 0; border-radius: .65rem; text-align: start; font-size: 1rem; letter-spacing: 0; }
  #navigation > a:hover, #navigation > button:hover, .ac-nav > button:hover, .ac-nav > a:hover { background: var(--sand-accent); }
  .ac-nav .ac-dropdown-panel { position: static; min-inline-size: 0; margin: .25rem .5rem .5rem; box-shadow: none; }
}
@media (max-width: 40rem) {
  .header, .academy .header { min-block-size: 0; padding-block: .4rem; }
}
@media (max-width: 80rem) {
  .hero-copy { grid-template-columns: minmax(0, 1fr); padding: 4rem 0 4rem; gap: 2.5rem; }

  .hero-intro { margin-block-start: 0; }

  .teacher-visual { justify-self: center; max-inline-size: 40rem; transform: none; }

  .hero h1 { font-size: clamp(2rem, 4.5vw, 3rem); }

  .hero-intro > p { font-size: clamp(1.125rem, 2.3vw, 1.5rem); }

}

@media (max-width: 60rem) {

  .subjects { grid-template-columns: minmax(0, 1fr); grid-auto-rows: auto; }

  .subject { padding: 1.25rem; gap: 1rem; }

  .subject-icon { inline-size: clamp(4rem, 12vw, 5rem); }

  .subject-copy strong { font-size: clamp(1.125rem, 2.5vw, 1.375rem); }


  .arrow { font-size: 2rem; }

}

@media (max-width: 40rem) {

  :root { --gutter: 1rem; }

  .hero-copy { padding-block: 3rem 4rem; }

  .teacher-visual { margin-block-end: 6rem; }

  .teacher-disc { transform: scale(1); }

  .teacher-disc::after { inset: -.75rem; }

  .hero h1 { font-size: clamp(1.75rem, 6.5vw, 2.5rem); }

  .footer-description { flex-basis: 100%; order: 1; }

  .footer-inner { column-gap: 1rem; font-size: .875rem; }

  .footer-brand { margin-inline-end: auto; }

}

@media (max-width: 40rem) {

  .subject { grid-template-columns: minmax(0, 1fr) auto; }

  .subject-icon { grid-column: 1 / -1; }

}

@media (prefers-reduced-motion: reduce) {

  html { scroll-behavior: auto; }

  *, *::before, *::after { transition: none !important; }

}

/* All palettes share layout and typography. Sand uses the approved fallbacks. */
:root[data-theme="soft-tech"] {
  --sand: #f4f6f8;
  --sand-light: #fff;
  --sand-accent: #e0e7ff;
  --copper: #6366f1;
  --line: #d9deea;
  --theme-page: #f4f6f8;
  --theme-card: #fff;
  --theme-border: #d9deea;
  --theme-tint: #e8eaff;
  --theme-button: #dce0ff;
  --theme-accent: #6366f1;
  --theme-board: #e0e4f5;
  --theme-board-line: #6366f118;
  --theme-shadow: #20274412;
  --theme-backdrop: #20274455;
  --kind-course-bg: #dcf0e3;
  --kind-course-border: #a0c9ad;
  --kind-extra-bg: #ffebc7;
  --kind-extra-border: #d5b276;
}
:root[data-theme="soft-tech"] #copper stop { stop-color: #6366f1; }
:root[data-theme="soft-tech"] .teacher-name { color: #625d86; }
.header .theme-toggle { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; flex-shrink: 0; min-block-size: 2.75rem; padding: .45rem .65rem; border: 1px solid var(--line); border-radius: .75rem; color: var(--ink); font: 400 .875rem/1.25 Arial, sans-serif; letter-spacing: 0; }
.theme-toggle:hover { background: var(--sand-accent); }
.theme-swatches { display: inline-flex; flex-shrink: 0; align-items: center; padding-inline-end: .2rem; }
.theme-swatches i { inline-size: .85rem; block-size: .85rem; border: 1px solid #9299a6; border-radius: 50%; margin-inline-end: -.2rem; }
.theme-swatches i:nth-child(1) { background: #f1e4d6; }
.theme-swatches i:nth-child(2) { background: #fff; }
.theme-swatches i:nth-child(3) { background: #17212b; }
.ac-login-top { flex-wrap: wrap; }

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #edf2f7;
  --sand: #17212b;
  --sand-light: #202b36;
  --sand-accent: #344b60;
  --copper: #8dbcf0;
  --line: #3b4b5b;
  --theme-page: #17212b;
  --theme-card: #202b36;
  --theme-border: #3b4b5b;
  --theme-tint: #2b3d50;
  --theme-button: #365a79;
  --theme-accent: #8dbcf0;
  --theme-board: #293e50;
  --theme-board-line: #9bc6f018;
  --theme-shadow: #00000030;
  --theme-backdrop: #080e16aa;
  --kind-course-bg: #244b43;
  --kind-course-border: #4d8b76;
  --kind-extra-bg: #594424;
  --kind-extra-border: #a18247;
}
:root[data-theme="dark"] #copper stop { stop-color: #8dbcf0; }
:root[data-theme="dark"] .teacher-name { color: #a9b9c9; }
:root[data-theme="dark"] input::placeholder,
:root[data-theme="dark"] textarea::placeholder { color: #adb9c6; opacity: 1; }