/* --------------------------------------------------------------------------
   1. Reset / базовая нормализация
   -------------------------------------------------------------------------- */
*,*::before,*::after {box-sizing: border-box;}
html {-webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-block-start: calc(var(--header-h) + 1rem);}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd {margin: 0;}
ul,ol {margin: 0; padding: 0;}
img,svg,video {display: block; max-inline-size: 100%; block-size: auto;}
input,button,textarea,select {font: inherit; color: inherit;}
a {color: var(--color-accent); text-decoration-thickness: 0.08em; text-underline-offset: 0.18em;}
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 0.25rem;}
h1:focus {outline: none;}

/* --------------------------------------------------------------------------
   2. Дизайн-токены
   -------------------------------------------------------------------------- */
:root {
  color-scheme: light dark;

  /* Размеры и типографика */
  --layout-max: 119rem;
  --header-h: 4.5rem;
  --radius: 0.75rem;
  --gap: 1.5rem;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;

  /* Светлая схема — fallback для старых браузеров */
  --color-bg: #f4f6f9;
  --color-surface: #ffffff;
  --color-surface-2: #eef1f6;
  --color-text: #14181d;
  --color-muted: #5b6675;
  --color-border: #d7dde5;
  --color-accent: #2f6fed;
  --color-accent-text: #ffffff;
  --color-backdrop: rgb(10 16 26 / 0.55);

  --shadow-md: 0 0.75rem 1.75rem rgb(16 24 40 / 0.18);
  --transition: 220ms ease;
}

/* Современная схема: light-dark() реагирует на color-scheme */
@supports (color: light-dark(#000, #fff)) {
  :root {
    --color-bg: light-dark(#f4f6f9, #0e1116);
    --color-surface: light-dark(#ffffff, #161b22);
    --color-surface-2: light-dark(#eef1f6, #1d242d);
    --color-text: light-dark(#14181d, #e7ecf3);
    --color-muted: light-dark(#5b6675, #9aa7b8);
    --color-border: light-dark(#d7dde5, #2a323d);
    --color-accent: light-dark(#2f6fed, #6ea8ff);
    --color-accent-text: light-dark(#ffffff, #0b1220);
    --color-backdrop: light-dark(rgb(10 16 26 / 0.55), rgb(0 0 0 / 0.65));

    --shadow-md: 0 0.75rem 1.75rem light-dark(rgb(16 24 40 / 0.18), rgb(0 0 0 / 0.6));
  }
}

/* Ручное переключение темы */
html[data-theme="light"] { color-scheme: light; }
html[data-theme="dark"]  { color-scheme: dark; }

/* --------------------------------------------------------------------------
   3. Базовая страница
   -------------------------------------------------------------------------- */
body {
  min-block-size: 100dvh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  background-color: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition), color var(--transition);
}

/* --------------------------------------------------------------------------
   4. Утилиты
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  inset-block-start: -6rem;
  inset-inline-start: 1rem;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: 600;
  text-decoration: none;
  transition: inset-block-start var(--transition);
}

.skip-link:focus-visible {inset-block-start: 0.75rem;}

/* --------------------------------------------------------------------------
   5. Корневой Grid-контейнер
   -------------------------------------------------------------------------- */
.layout_grid {
    display: grid;
    /*grid-template-columns: fit-content(17rem) minmax(0, 1fr);*/
    grid-template-columns: minmax(max-content, 1fr) minmax(0, 2fr);
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
        "header header"
        "aside  main"
        "aside  footer";
    inline-size: 100%;
    max-inline-size: var(--layout-max);
    margin-inline: auto;
    min-block-size: 100dvh;
    background-color: var(--color-bg);
}

/* --------------------------------------------------------------------------
   6. Шапка и гамбургер
   -------------------------------------------------------------------------- */
.site-header {
  grid-area: header;
  position: sticky;
  inset-block-start: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: var(--gap);
  min-block-size: var(--header-h);
  padding-block: 0.75rem;
  padding-inline: clamp(1rem, 3vw, 2rem);
  background-color: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-text);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  inline-size: 2rem;
  block-size: 2rem;
  border-radius: 0.5rem;
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

/* --- Переключатель меню (только мобильные) ------------------------------- */
.nav-toggle, .nav-toggle-label {display: none;}

.nav-toggle-label {
  place-items: center;
  margin-inline-start: auto;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: 0.625rem;
  background-color: var(--color-surface-2);
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
  transition: background-color var(--transition), border-color var(--transition);
}

.nav-toggle-label:hover {background-color: var(--color-border);}

.nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after {
  display: block;
  inline-size: 1.25rem;
  block-size: 0.125rem;
  border-radius: 999px;
  background-color: currentColor;
  transition: transform var(--transition), top var(--transition), background-color var(--transition);
}

.nav-toggle-bars {position: relative;}
.nav-toggle-bars::before, .nav-toggle-bars::after {content: ""; position: absolute; inset-inline-start: 0;}
.nav-toggle-bars::before { top: -0.4375rem; }
.nav-toggle-bars::after  { top:  0.4375rem; }

/* Меню открыто → гамбургер превращается в крестик */
.layout_grid:has(.nav-toggle:checked) .nav-toggle-bars {background-color: transparent;}
.layout_grid:has(.nav-toggle:checked) .nav-toggle-bars::before {top: 0; transform: rotate(45deg);}
.layout_grid:has(.nav-toggle:checked) .nav-toggle-bars::after {top: 0; transform: rotate(-45deg);}

.nav-toggle:focus-visible + .nav-toggle-label {outline: 3px solid var(--color-accent); outline-offset: 2px;}

/* --------------------------------------------------------------------------
   7. Основной контент
   -------------------------------------------------------------------------- */
.site-main {
  grid-area: main;
  min-inline-size: 0;
  padding-block: clamp(1.5rem, 4vw, 3rem);
  padding-inline: clamp(1rem, 4vw, 3rem);
}

.content > * + * {margin-block-start: 1rem;}

.content h1 {
  font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.lead {
  max-inline-size: 62ch;
  font-size: clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  color: var(--color-muted);
}

.content code {
  padding: 0.1em 0.35em;
  border-radius: 0.35rem;
  background-color: var(--color-surface-2);
  font-size: 0.9em;
}

.cards {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  margin-block-start: var(--gap);
}

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

.card h2 {
  margin-block-end: 0.5rem;
  font-size: 1.05rem;
}

.card p {
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   8. Формы / валидация (совместимо с Bootstrap)
   -------------------------------------------------------------------------- */
.valid.modified:not([type=checkbox]) {outline: 1px solid #26b050;}

.invalid {outline: 1px solid #e50000;}

.validation-message {color: #e50000;}

.darker-border-checkbox.form-check-input {border-color: #929292;}

.form-floating > .form-control-plaintext::placeholder,
.form-floating > .form-control::placeholder {
  color: var(--bs-secondary-color);
  text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder,
.form-floating > .form-control:focus::placeholder {
  text-align: start;
}

/* --------------------------------------------------------------------------
   9. Blazor ErrorBoundary
   -------------------------------------------------------------------------- */
.blazor-error-boundary {
  background:
    url(data:image/svg+xml;base64,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)
    no-repeat 1rem/1.8rem,
    #b32121;
  padding: 1rem 1rem 1rem 3.7rem;
  color: #fff;
}

.blazor-error-boundary::after { content: "An error has occurred.";}

/* --------------------------------------------------------------------------
   10. Мобильный режим — off-canvas, backdrop и сквозные состояния
   --------------------------------------------------------------------------
   Важно: правила с :has() связывают .nav-toggle (в хедере) с .site-aside
   и .nav-backdrop. Если их положить в изолированный CSS, скоуп-атрибут
   [b-xxxxx] попадёт не туда и селектор перестанет совпадать. Поэтому
   держим их глобально.
   -------------------------------------------------------------------------- */
@media (max-width: 60rem) {
  .layout_grid {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
      "header"
      "main"
      "footer";
  }

  /* Блокируем прокрутку страницы, пока меню открыто */
  body:has(.nav-toggle:checked) {overflow: hidden;}

  /* Визуально скрытый, но доступный с клавиатуры чекбокс */
  .nav-toggle {
    display: block;
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    margin: -1px;
    padding: 0;
    border: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .nav-toggle-label {display: grid;}

  /* Подложка под мобильное меню */
  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 30;
    background-color: var(--color-backdrop);
    opacity: 0;
    visibility: hidden;
    cursor: pointer;
    transition: opacity var(--transition), visibility 0s linear var(--transition);
  }

  .layout_grid:has(.nav-toggle:checked) .nav-backdrop {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--transition), visibility 0s;
  }

  /* Показ изолированного .site-aside по состоянию .nav-toggle */
  .layout_grid:has(.nav-toggle:checked) .site-aside {
    transform: translateX(0);
    visibility: visible;
    transition: transform var(--transition), visibility 0s;
  }
}

/* --------------------------------------------------------------------------
   11. Уважение к prefers-reduced-motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {scroll-behavior: auto;}

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}