:root {
  color-scheme: light dark;
  --bg: #f7f5ef;
  --surface: #ffffff;
  --text: #23241f;
  --muted: #6a6b63;
  --line: #e2ded2;
  --accent: #3d6b4b;
  --accent-soft: #e5eee6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161714;
    --surface: #1e201c;
    --text: #e8e7e0;
    --muted: #a1a296;
    --line: #33352f;
    --accent: #8cc39a;
    --accent-soft: #23302548;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.65 Georgia, "Times New Roman", serif; }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.site { border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 600 19px/1 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text); text-decoration: none; }
.brand img { width: 26px; height: 26px; }
nav a { font: 15px system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--muted); text-decoration: none; margin-left: 18px; }
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
.hero { padding: 72px 0 48px; }
.hero h1 { font-size: clamp(32px, 6vw, 46px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.5px; }
.hero p { font-size: 19px; color: var(--muted); margin: 0 0 26px; max-width: 34em; }
.btn { display: inline-block; font: 600 15px system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--accent); color: var(--bg); padding: 11px 18px; border-radius: 8px; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); margin-left: 8px; }
section { padding: 28px 0; }
h2 { font: 600 14px system-ui, -apple-system, "Segoe UI", sans-serif; text-transform: uppercase; letter-spacing: 1.4px; color: var(--accent); margin: 0 0 18px; }
.topics { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.topic { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.topic b { display: block; font: 600 16px system-ui, -apple-system, "Segoe UI", sans-serif; margin-bottom: 4px; }
.topic span { color: var(--muted); font-size: 15px; }
.posts { list-style: none; margin: 0; padding: 0; }
.posts li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.posts li:last-child { border-bottom: 0; }
.posts a { font-size: 20px; text-decoration: none; color: var(--text); }
.posts a:hover { color: var(--accent); }
.meta { display: block; font: 14px system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--muted); margin-top: 2px; }
.posts p { margin: 6px 0 0; color: var(--muted); font-size: 16px; }
article { padding: 48px 0 24px; }
article h1 { font-size: clamp(28px, 5vw, 38px); line-height: 1.2; margin: 0 0 6px; }
article h3 { font: 600 19px system-ui, -apple-system, "Segoe UI", sans-serif; margin: 30px 0 8px; }
article ul, article ol { padding-left: 22px; }
article li { margin-bottom: 6px; }
code { font: 14px ui-monospace, Menlo, Consolas, monospace; background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; }
blockquote { margin: 18px 0; padding: 4px 0 4px 16px; border-left: 3px solid var(--accent); color: var(--muted); }
.back { font: 15px system-ui, -apple-system, "Segoe UI", sans-serif; }
nav { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 18px; }
nav a { margin-left: 0; }
nav .login { color: var(--text); }
nav .cta { font-weight: 600; color: var(--bg); background: var(--accent); padding: 7px 14px; border-radius: 8px; }
nav .cta:hover { color: var(--bg); opacity: 0.92; }
.lead { font-size: 19px; color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.feature { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.feature b { display: block; font: 600 17px system-ui, -apple-system, "Segoe UI", sans-serif; margin-bottom: 6px; }
.feature span { color: var(--muted); font-size: 15px; line-height: 1.55; }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: s; position: relative; padding: 0 0 16px 46px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font: 600 15px/30px system-ui, sans-serif; text-align: center; }
.steps b { font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.form { max-width: 420px; margin: 0 auto; padding: 48px 0 24px; }
.form h1 { font-size: 30px; margin: 0 0 6px; }
.form label { display: block; font: 600 14px system-ui, -apple-system, "Segoe UI", sans-serif; margin: 16px 0 6px; }
.form input, .form select, .form textarea { width: 100%; font: 16px system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
.form textarea { min-height: 96px; resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.form button { width: 100%; margin-top: 20px; font: 600 16px system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--accent); color: var(--bg); border: 0; border-radius: 8px; padding: 12px; cursor: pointer; }
.form button[disabled] { opacity: 0.6; cursor: wait; }
.form .small { font: 14px system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--muted); margin-top: 14px; }
.notice { display: none; margin-top: 16px; padding: 12px 14px; border-radius: 8px; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
.notice.show { display: block; }
.notice.err { background: #b4231814; color: #b42318; border: 1px solid #b4231840; }
.notice.ok { background: var(--accent-soft); color: var(--text); border: 1px solid var(--line); }
@media (prefers-color-scheme: dark) { .notice.err { color: #ff8a80; } }
footer.site { border-top: 1px solid var(--line); margin-top: 40px; }
footer.site .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 22px 20px 36px; font: 14px system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--muted); }
footer.site a { color: var(--muted); }