:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1c2230;
  --muted: #5d6576;
  --border: #e3e0d8;
  --accent: #0f766e;
  --accent-text: #ffffff;
  --accent-soft: #e3f3f1;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --success-soft: #e6f4ea;
  --code-bg: #faf9f6;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --surface: #1b1f29;
    --text: #e7e9ee;
    --muted: #9aa3b5;
    --border: #2c3240;
    --accent: #2dd4bf;
    --accent-text: #08201d;
    --accent-soft: #163330;
    --danger: #f97066;
    --danger-soft: #3a1d1b;
    --success-soft: #16301f;
    --code-bg: #161a23;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; }
h3 { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
main.wrap { padding-top: 24px; padding-bottom: 48px; }
main section { margin-bottom: 28px; }

.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.header-row { display: flex; align-items: center; justify-content: space-between; min-height: 60px; gap: 16px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand-mark { color: var(--accent); }
nav a { margin-left: 18px; text-decoration: none; color: var(--muted); font-weight: 500; }
nav a:hover { color: var(--text); }
.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; padding: 20px 0 32px; }

.hero { padding: 24px 0 8px; }
.lede { font-size: 1.1rem; color: var(--muted); max-width: 680px; }
.steps { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 18px 0 0; counter-reset: s; }
.steps li { counter-increment: s; background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px; }
.steps li::before { content: counter(s) "  "; color: var(--accent); font-weight: 700; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; margin-bottom: 28px; }
.grid-2 > .card { margin: 0; }

.stack > * + * { margin-top: 16px; }
.field label, legend { display: block; font-weight: 600; margin-bottom: 6px; }
input[type=text], input[type=file], textarea, select {
  width: 100%; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px;
}
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

fieldset.platforms { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px; }
fieldset.platforms legend { width: 100%; }
.platform-option { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; border: 1px solid var(--border);
  border-radius: 999px; padding: 8px 16px; background: var(--bg); font-weight: 500; text-decoration: none; color: var(--text); }
.platform-option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.platform-option input { accent-color: var(--accent); margin: 0; }
.hint { margin: 0; color: var(--muted); }

.btn { display: inline-block; font: inherit; font-weight: 600; cursor: pointer; border-radius: 8px; padding: 10px 18px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); text-decoration: none; }
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: .7; cursor: progress; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); }
.btn-small { padding: 6px 12px; font-size: .9rem; margin-top: 8px; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 14px; }
.row form { margin: 0; }

.messages { margin-bottom: 20px; }
.msg { border-radius: 8px; padding: 12px 16px; margin-bottom: 8px; border: 1px solid var(--border); background: var(--surface); }
.msg-success { background: var(--success-soft); }
.msg-error { background: var(--danger-soft); color: var(--danger); border-color: transparent; }
.error { color: var(--danger); margin: 6px 0 0; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }

.badge { font-size: .85rem; border-radius: 999px; padding: 3px 10px; background: var(--accent-soft); color: var(--text); white-space: nowrap; }
.badge-bad { background: var(--danger-soft); color: var(--danger); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.chip { font-size: .85rem; border: 1px solid var(--border); border-radius: 999px; padding: 3px 10px; background: var(--surface); }

pre { white-space: pre-wrap; word-wrap: break-word; font: inherit; margin: 0; background: var(--code-bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; }
pre.original { max-height: 420px; overflow: auto; font-size: .92rem; }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 12px; }
pre.before { color: var(--muted); }
pre.after { border-color: var(--accent); }
.notes { margin: 12px 0 0; color: var(--muted); font-size: .92rem; }
.result-head { margin-bottom: 20px; }
.apply-card { border-color: var(--accent); }
.apply-card p { margin: 0; }
.tips { margin: 0; padding-left: 20px; }
.tips li + li { margin-top: 6px; }

fieldset.checklist { border: 0; padding: 0; margin: 0; }
fieldset.checklist label { display: flex; align-items: center; gap: 10px; padding: 8px 0; flex-wrap: wrap; }
fieldset.checklist input { accent-color: var(--accent); width: 18px; height: 18px; }
.site-preview { width: 100%; height: 640px; border: 1px solid var(--border); border-radius: 8px; margin-top: 16px; background: #fff; }

.saved-list { list-style: none; padding: 0; margin: 0; }
.saved-list li { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.saved-list a { font-weight: 600; text-decoration: none; }

@media (max-width: 760px) {
  .grid-2, .compare { grid-template-columns: 1fr; }
  nav a { margin-left: 12px; }
}