@font-face { font-family: Inter; src: url("assets/Inter-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: Inter; src: url("assets/Inter-SemiBold.ttf") format("truetype"); font-weight: 600; font-display: swap; }
@font-face { font-family: Inter; src: url("assets/Inter-Bold.ttf") format("truetype"); font-weight: 700; font-display: swap; }

:root {
  --brand: #FF5A00;
  --brand-hover: #FF6600;
  --ink: #1E222A;
  --text: #1E222A;
  --muted: #5E6573;
  --bg: #FFFFFF;
  --surface: #F6F7F9;
  --line: #E4E6EB;
  --warn-bg: #FFF3EC;
  --error: #C62828;
  --on-brand: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #F2F3F5;
    --muted: #A3A9B5;
    --bg: #14171C;
    --surface: #1E222A;
    --line: #2C313B;
    --warn-bg: #2A2119;
    --error: #FF7A70;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 15px/1.55 Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--brand); }
code { font-size: .9em; background: var(--surface); padding: 1px 5px; border-radius: 4px; }

.top, main, .foot { max-width: 760px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
.top { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; }
.brand { display: flex; align-items: center; gap: 10px; }
.logo { width: 34px; height: auto; color: var(--text); }
.wordmark { font-weight: 700; font-size: 18px; letter-spacing: -.01em; }
.tag { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); border-left: 1px solid var(--line); padding-left: 10px; }
.lang { display: flex; gap: 2px; }
.lang button {
  font: 600 12px Inter, system-ui, sans-serif; color: var(--muted); background: none;
  border: 1px solid transparent; border-radius: 6px; padding: 5px 8px; cursor: pointer;
}
.lang button[aria-pressed="true"] { color: var(--text); border-color: var(--line); }

.hero { padding: 28px 0 8px; border-top: 1px solid var(--line); }
h1 { font-size: clamp(24px, 5vw, 32px); line-height: 1.2; font-weight: 700; letter-spacing: -.02em; margin: 0 0 10px; }
.lead { color: var(--muted); margin: 0 0 22px; max-width: 60ch; }
.install { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.primary {
  font: 600 15px Inter, system-ui, sans-serif; color: var(--on-brand); background: var(--brand);
  border: 0; border-radius: 10px; padding: 12px 20px; cursor: pointer; min-height: 44px;
}
.primary:hover { background: var(--brand-hover); }
.primary:focus-visible, .lang button:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.meta { margin: 12px 0 0; font-size: 13px; color: var(--muted); }
.notice { border-radius: 10px; padding: 12px 14px; font-size: 14px; }
.notice.warn { background: var(--warn-bg); border: 1px solid var(--brand); }
.notice.error { color: var(--error); padding: 0; margin: 10px 0 0; }

.steps h2 { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 34px 0 10px; }
.steps ul, .steps ol { margin: 0; padding-left: 22px; }
.steps li { margin: 6px 0; }
.steps ol li::marker { color: var(--brand); font-weight: 700; }
.hint { font-size: 13px; color: var(--muted); margin: 10px 0 0; }
.trouble dt { font-weight: 600; margin-top: 14px; }
.trouble dd { margin: 4px 0 0; color: var(--muted); }

.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font-size: 12px; color: var(--muted); padding-top: 28px; padding-bottom: 28px; margin-top: 36px; border-top: 1px solid var(--line); }