/* Раскладка: асимметричная, по левому краю; фирменная форма — вкладка картонной папки */
:root {
  --paper: #f1f2ee;       /* фон: холодная бумага с зелёным оттенком */
  --sheet: #fbfbf8;       /* поверхности */
  --ink: #16181a;         /* основной текст */
  --ink-2: #555b57;       /* второстепенный текст */
  --rule: #d9dcd4;        /* линии и рамки */
  --folder: #e9b949;      /* акцент: цвет канцелярской папки */
  --folder-ink: #1b1608;  /* текст на акценте */
  --folder-soft: #f4e3b5;
  --ok: #2f7d4f;
  --focus: #2f5fd0;

  --f-display: "Geologica", "Segoe UI", system-ui, sans-serif;
  --f-body: "Golos Text", "Segoe UI", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.5rem;
  --step-3: clamp(1.75rem, 3.2vw, 2.375rem);
  --step-4: clamp(2.5rem, 6.4vw, 4.75rem);

  --gutter: clamp(16px, 4vw, 40px);
  --max: 1180px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121412;
    --sheet: #1a1d1b;
    --ink: #e9eae4;
    --ink-2: #9ba29c;
    --rule: #2c312d;
    --folder: #f0c255;
    --folder-ink: #1b1608;
    --folder-soft: #3a311a;
    --ok: #6cc28d;
    --focus: #8aa8ff;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #121412;
  --sheet: #1a1d1b;
  --ink: #e9eae4;
  --ink-2: #9ba29c;
  --rule: #2c312d;
  --folder: #f0c255;
  --folder-ink: #1b1608;
  --folder-soft: #3a311a;
  --ok: #6cc28d;
  --focus: #8aa8ff;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--step-0)/1.6 var(--f-body);
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}
a { color: inherit; }
h1, h2, h3 { font-family: var(--f-display); margin: 0; text-wrap: balance; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.mono { font-family: var(--f-mono); font-size: var(--step--1); letter-spacing: 0; }
.wrap { max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }

/* шапка */
.top {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.top .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.mark { display: inline-flex; align-items: baseline; gap: 6px; text-decoration: none; }
.mark b { font: 800 22px/1 var(--f-display); letter-spacing: -0.04em; }
.mark b i { font-style: normal; color: var(--folder); }
.mark span { font: 500 12px/1 var(--f-mono); color: var(--ink-2); text-transform: lowercase; }
.nav { display: flex; gap: 26px; margin-left: auto; }
.nav a { text-decoration: none; color: var(--ink-2); font-size: 15px; }
.nav a:hover { color: var(--ink); }
.actions { display: flex; align-items: center; gap: 10px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 18px; border-radius: 6px;
  font: 600 15px/1 var(--f-body); text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: background-color .15s, border-color .15s, transform .1s;
}
.btn:active { transform: translateY(1px); }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: color-mix(in srgb, var(--ink) 86%, var(--folder)); }
.btn-line { border-color: var(--rule); background: transparent; color: var(--ink); }
.btn-line:hover { border-color: var(--ink-2); }

.theme {
  width: 42px; height: 42px; display: grid; place-items: center;
  border: 1px solid var(--rule); border-radius: 6px; background: transparent; color: var(--ink);
  cursor: pointer; transition: border-color .15s;
}
.theme:hover { border-color: var(--ink-2); }
.theme svg { width: 18px; height: 18px; }
.theme .sun { display: none; }
:root[data-theme="dark"] .theme .sun { display: block; }
:root[data-theme="dark"] .theme .moon { display: none; }

@media (max-width: 860px) {
  .nav { display: none; }
  .actions { margin-left: auto; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}