:root {
  --bg: #f6f7f9; --surface: #fff; --text: #1a1e23; --muted: #56606b; --border: #d5dbe3;
  --primary: #2452b8; --primary-soft: #e3ebfb; --ok: #1c7a45; --ok-soft: #e0f3e8; --warn-soft: #fff4d6;
  --radius: 14px; color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #16191d; --surface: #20242a; --text: #eef1f4; --muted: #a9b2bc; --border: #3a414a;
    --primary: #7aa2f7; --primary-soft: #26334d; --ok: #6fd49a; --ok-soft: #1d3527; --warn-soft: #3a3320; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 18px/1.6 Verdana, "Atkinson Hyperlegible", Arial, sans-serif; letter-spacing: .01em; }
a { color: var(--primary); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
header.top { background: var(--surface); border-bottom: 1px solid var(--border); }
header.top .wrap { display: flex; align-items: center; gap: 12px; min-height: 64px; flex-wrap: wrap; }
header.top img { width: 36px; height: 36px; border-radius: 8px; }
header.top .brand { font-weight: 700; font-size: 1.15em; text-decoration: none; color: var(--text); display: flex; gap: 10px; align-items: center; }
header.top nav { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }
header.top nav a { text-decoration: none; font-weight: 700; }
.hero { padding: 56px 0 32px; }
.hero h1 { font-size: 2.1em; line-height: 1.2; margin: 0 0 16px; }
.hero p { font-size: 1.1em; color: var(--muted); max-width: 42em; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 10px 22px;
  border-radius: 10px; border: 2px solid var(--primary); background: var(--primary); color: #fff; font: inherit; font-weight: 700;
  text-decoration: none; cursor: pointer; }
@media (prefers-color-scheme: dark) { .btn { color: #0d1320; } }
.btn.ghost { background: transparent; color: var(--primary); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
section { padding: 28px 0; }
h2 { font-size: 1.5em; margin: 0 0 16px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 1.15em; }
.card p { margin: 0; color: var(--muted); }
.price { font-size: 1.8em; font-weight: 700; margin: 8px 0; }
.price small { font-size: .5em; color: var(--muted); font-weight: 400; }
.card.featured { border: 2px solid var(--primary); }
.card ul { padding-left: 1.2em; margin: 12px 0; }
.notice { padding: 14px 16px; border-radius: 10px; background: var(--primary-soft); }
.notice.warn { background: var(--warn-soft); }
.notice.ok { background: var(--ok-soft); }
.key { font: 700 1.5em ui-monospace, Menlo, Consolas, monospace; letter-spacing: .08em; padding: 14px; background: var(--surface);
  border: 2px dashed var(--primary); border-radius: 10px; text-align: center; user-select: all; overflow-wrap: anywhere; }
input { font: inherit; padding: 12px; border-radius: 10px; border: 1.5px solid var(--border); background: var(--surface); color: var(--text); min-height: 52px; width: 100%; }
footer { padding: 32px 0 48px; color: var(--muted); font-size: .9em; border-top: 1px solid var(--border); margin-top: 32px; }
footer .wrap { display: flex; gap: 20px; flex-wrap: wrap; }
ol li, ul li { margin: 6px 0; }
code { background: var(--surface); border: 1px solid var(--border); padding: 2px 6px; border-radius: 6px; font-size: .85em; }
@media (max-width: 600px) { body { font-size: 17px; } .hero h1 { font-size: 1.6em; } }