/* Tochki Club: shared styles. No external requests. */

:root {
  --bg: #0F1216;
  --surface: #181D24;
  --surface-elevated: #212933;
  --border: #2A323D;
  --text: #F4F6F8;
  --text-secondary: #B8C0CC;
  --text-muted: #8C96A5;
  --accent: #4E8CFF;
  --accent-text: #7AA8FF;
  --p1: #4E8CFF;
  --p2: #FF5A6E;
  --success: #3DDC97;
  --warning: #F5B14C;
  --header-from: #1B2735;
  --header-to: #141A22;
  --card-from: #26364F;
  --card-to: #1B2735;
  --paper: #F5F0E4;
  --paper-line: #C9DDF0;
  --paper-ink: #2B3A55;
  --pen-blue: #1E56D6;
  --pen-red: #D92D43;
  --grid: 24px;
  --radius: 14px;
  --maxw: 60rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  /* School-notebook squared paper, faint blue lines */
  background-image:
    linear-gradient(rgba(78, 140, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(78, 140, 255, 0.07) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
  background-position: -1px -1px;
}

a { color: var(--accent-text); text-underline-offset: 0.18em; }
a:hover { color: var(--text); }
a:focus-visible, .nav a:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -3rem;
  padding: 0.5rem 0.9rem;
  background: var(--surface-elevated);
  color: var(--text);
  border-radius: 8px;
  z-index: 10;
}
.skip-link:focus { top: 0.5rem; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: linear-gradient(180deg, var(--header-from), var(--header-to));
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.01em;
}
.brand svg { width: 28px; height: 28px; flex: none; }
.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
}
.nav a {
  display: inline-block;
  padding: 0.35rem 0.6rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
}
.nav a:hover { color: var(--text); background: var(--surface-elevated); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-elevated); }
.nav .lang a {
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

main { flex: 1; padding: 2rem 0 3rem; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.6em; }
h1 { font-size: 2.1rem; letter-spacing: -0.01em; }
h2 { font-size: 1.4rem; margin-top: 2rem; }
h3 { font-size: 1.1rem; margin-top: 1.4rem; }
p, ul, ol { margin: 0 0 1em; }
ul, ol { padding-left: 1.3em; }
li { margin-bottom: 0.35em; }
strong { color: var(--text); }
.muted { color: var(--text-muted); }
.secondary { color: var(--text-secondary); }

/* Cards */
.card {
  background: linear-gradient(160deg, var(--card-from), var(--card-to));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}

/* Hero */
.hero {
  display: grid;
  gap: 1.75rem;
  align-items: center;
}
.hero .pitch {
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 1rem;
}
.facts { list-style: none; padding: 0; margin: 0 0 1.25rem; }
.facts li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--text-secondary);
}
.facts li::before {
  content: "";
  position: absolute;
  left: 0.2rem;
  top: 0.62em;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--p1);
}
.facts li:nth-child(even)::before { background: var(--p2); }

/* Notebook paper card */
.paper {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--paper-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
  color: var(--paper-ink);
  border-radius: var(--radius);
  padding: 0.75rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  max-width: 340px;
  width: 100%;
  justify-self: center;
}
.paper svg { display: block; width: 100%; height: auto; }
.paper figcaption {
  font-size: 0.85rem;
  color: var(--paper-ink);
  text-align: center;
  margin-top: 0.4rem;
}

/* Store badges (disabled placeholders) */
.badges { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0 0 1rem; }
.badge {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  min-width: 10.5rem;
  padding: 0.5rem 1rem;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text-secondary);
  cursor: not-allowed;
  user-select: none;
}
.badge .store { font-weight: 700; color: var(--text); font-size: 1rem; }
.badge .soon { font-size: 0.85rem; color: var(--text-muted); }

/* Steps */
.steps {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: grid;
  gap: 0.9rem;
  counter-reset: step;
}
.steps li {
  counter-increment: step;
  margin: 0;
  position: relative;
  padding-left: 3.1rem;
  min-height: 2.3rem;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  background: var(--surface-elevated);
  border: 2px solid var(--p1);
  color: var(--text);
}
.steps li:nth-child(2)::before { border-color: var(--p2); }
.steps li:nth-child(3)::before { border-color: var(--success); }

.notice {
  border-left: 4px solid var(--success);
}
.panel > .last, .card > .last { margin-bottom: 0; }

/* FAQ */
.faq { display: grid; gap: 0.75rem; }
.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0 1.1rem;
}
.faq summary {
  cursor: pointer;
  padding: 0.9rem 0;
  font-weight: 600;
  color: var(--text);
  list-style-position: outside;
}
.faq summary:focus-visible { outline: 2px solid var(--accent-text); outline-offset: 2px; border-radius: 6px; }
.faq details[open] summary { border-bottom: 1px solid var(--border); margin-bottom: 0.8rem; }
.faq details > *:not(summary) { color: var(--text-secondary); }
.faq details > *:last-child { margin-bottom: 1rem; }

/* Long-form documents */
.doc { max-width: 46rem; }
.doc p, .doc li { color: var(--text-secondary); }
.doc h2 { border-top: 1px solid var(--border); padding-top: 1.25rem; }
.doc table { width: 100%; border-collapse: collapse; margin: 0 0 1rem; font-size: 0.95rem; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--border); }
.doc th { color: var(--text); font-weight: 600; }
.doc td { color: var(--text-secondary); }
.doc code, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface-elevated);
  padding: 0.05em 0.35em;
  border-radius: 5px;
  color: var(--text);
}
.meta { color: var(--text-muted); font-size: 0.95rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--header-to);
  color: var(--text-muted);
  font-size: 0.92rem;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.25rem 1.1rem; }
.site-footer li { margin: 0; }
.site-footer a { color: var(--text-secondary); }
.site-footer a:hover { color: var(--text); }
.site-footer p { margin: 0; }

/* 404 */
.notfound { text-align: center; padding-top: 2rem; }
.notfound .big { font-size: 4rem; font-weight: 800; letter-spacing: 0.05em; margin: 0; }
.notfound .big .r { color: var(--p2); }
.notfound .big .b { color: var(--p1); }

@media (min-width: 760px) {
  h1 { font-size: 2.6rem; }
  main { padding-top: 3rem; }
  .hero { grid-template-columns: 1.2fr 1fr; gap: 2.5rem; }
  .steps { grid-template-columns: repeat(3, 1fr); }
}

@media (prefers-reduced-motion: no-preference) {
  .nav a, a { transition: color 0.15s, background-color 0.15s; }
}

@media print {
  body { background: #fff; color: #000; }
  .site-header, .site-footer, .badges { display: none; }
  .doc p, .doc li, .faq details > * { color: #000; }
}

/* Long Russian words in headings must not overflow on narrow phones. */
h1, h2, h3 { overflow-wrap: anywhere; hyphens: auto; }
@media (max-width: 420px) { h1 { font-size: 1.7rem; } }