/* Layout: один экран, логотип строго по центру, кнопка входа под слоганом; форма — модальное окно. Токены совпадают с mockups/assets/styles.css. */
:root {
  --paper: #F1F3F2;
  --surface: #E6EAE9;
  --ink: #121719;
  --muted: #5B666A;
  --line: #D1D8D7;
  --accent: #1E5A66;
  --danger: #A3322A;

  --display: "Unbounded", "Helvetica Neue", Arial, sans-serif;
  --body: "Onest", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0E1315; --surface: #161D20; --ink: #E4EAE9; --muted: #8B979B;
    --line: #243033; --accent: #7DB6C1; --danger: #E5847B;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0E1315; --surface: #161D20; --ink: #E4EAE9; --muted: #8B979B;
  --line: #243033; --accent: #7DB6C1; --danger: #E5847B;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
  display: grid;
  place-items: center;
  padding-block: 48px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--accent); color: var(--paper); }

.center { display: grid; justify-items: center; gap: 28px; text-align: center; }
.brand { display: grid; justify-items: center; gap: 22px; }
.brand svg { width: clamp(64px, 12vw, 96px); height: auto; }
.ring { fill: none; stroke: currentColor; stroke-width: 1.1; }
.core { fill: var(--accent); }
.wordmark {
  margin: 0;
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.05;
  letter-spacing: -.03em;
}
.slogan {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.btn {
  font: 500 15px/1 var(--body);
  padding: 13px 26px;
  border-radius: 100px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s, opacity .15s;
}
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-solid { background: var(--ink); color: var(--paper); border: 1px solid var(--ink); width: 100%; }
.btn-solid:hover { opacity: .88; }
.btn-solid:disabled { opacity: .55; cursor: progress; }
.open-login { margin-top: 20px; }

/* ---------- dialog ---------- */
dialog {
  width: min(400px, calc(100% - 32px));
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 24px 64px -24px rgba(0, 0, 0, .35);
}
dialog::backdrop { background: rgba(14, 19, 21, .32); backdrop-filter: blur(3px); }
.login { display: grid; gap: 20px; padding: 32px 28px 28px; }
.login-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.login-head h2 {
  margin: 0; font-family: var(--display); font-weight: 400;
  font-size: 22px; letter-spacing: -.02em;
}
.close {
  width: 32px; height: 32px; display: grid; place-items: center;
  background: transparent; border: 0; border-radius: 50%; color: var(--muted);
  cursor: pointer; font-size: 20px; line-height: 1;
}
.close:hover { color: var(--ink); background: var(--surface); }
.field { display: grid; gap: 6px; }
.field label {
  font-family: var(--mono); font-size: 12px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
}
.field input {
  font: 400 16px/1.4 var(--body); color: var(--ink);
  background: var(--surface); border: 1px solid transparent; border-radius: 4px;
  padding: 11px 12px; width: 100%;
}
.field input:focus { outline: none; border-color: var(--accent); background: var(--paper); }
.login[data-error] .field input { border-color: var(--danger); }
.error {
  margin: 0; font-size: 14px; color: var(--danger);
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
.open-login { display: inline-block; text-decoration: none; }