:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --fg: #16181d;
  --muted: #5d6470;
  --line: #e1e4e8;
  --accent: #0b6e4f;
  --accent-fg: #ffffff;
  --accent-soft: #e6f3ee;
  --warn: #8a5300;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16,24,40,.05), 0 8px 24px rgba(16,24,40,.06);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1113; --surface: #171a1e; --fg: #e8eaed; --muted: #a2a9b4; --line: #2a2f36;
    --accent: #3ccf91; --accent-fg: #06251a; --accent-soft: #12271f; --warn: #f0b35a;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"] {
  --bg: #0f1113; --surface: #171a1e; --fg: #e8eaed; --muted: #a2a9b4; --line: #2a2f36;
  --accent: #3ccf91; --accent-fg: #06251a; --accent-soft: #12271f; --warn: #f0b35a;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
img, svg { max-width: 100%; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
main > .narrow { padding-top: 36px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 750; font-size: 18px; color: var(--fg); text-decoration: none; letter-spacing: -.01em; }
nav { display: flex; gap: 4px 16px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 550; }
nav a:hover { color: var(--fg); }

.hero { padding: 40px 0 16px; }
h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.12; letter-spacing: -.02em; margin: 0 0 12px; text-wrap: balance; }
.lede { font-size: 18px; color: var(--muted); max-width: 72ch; margin: 0 0 24px; }

.converter-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; }
#converter { display: block; width: 100%; height: 260px; border: 0; background: transparent; }

.trust { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 12px 4px 2px; padding: 0; font-size: 14px; color: var(--muted); }
.trust li { display: inline-flex; align-items: center; gap: 6px; }
.trust svg { width: 16px; height: 16px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.detected { margin: 16px 0 0; font-weight: 600; }
.help-slot:empty { display: none; }
.help { margin-top: 20px; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); border-radius: var(--radius); padding: 20px; }
.help h2 { margin: 0 0 6px; font-size: 22px; }
.help p { margin: 0 0 12px; }
.help p:last-child { margin-bottom: 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 10px 18px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--surface); color: var(--fg);
  font: inherit; font-size: 16px; font-weight: 650; text-decoration: none; cursor: pointer;
}
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.btn[disabled] { opacity: .6; cursor: progress; }

.prose { padding-bottom: 48px; }
.content-section { margin-top: 40px; }
.content-section h2 { font-size: 24px; letter-spacing: -.01em; margin: 0 0 10px; }
.prose h2 { font-size: 24px; margin: 32px 0 10px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.steps li::marker { font-weight: 700; color: var(--accent); }

.faq details { border-top: 1px solid var(--line); padding: 12px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 650; }
.faq details p { margin: 8px 0 0; color: var(--muted); }

code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 1px 5px; overflow-wrap: anywhere; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
table.hashes { border-collapse: collapse; width: 100%; font-size: 13px; }
.hashes th, .hashes td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.hashes code { border: 0; background: none; padding: 0; }
.hashes .hash { word-break: break-all; }

.form { display: grid; gap: 16px; margin: 24px 0 48px; }
.form label { display: grid; gap: 6px; font-weight: 600; }
.form input, .form select, .form textarea {
  font: inherit; font-weight: 400; color: var(--fg); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-height: 44px; width: 100%;
}
.form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.form .check input { width: 20px; min-height: 20px; height: 20px; margin-top: 3px; flex: none; }
.form .warn { color: var(--warn); margin: 0; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.panel.success { background: var(--accent-soft); border-radius: var(--radius); padding: 20px; }

.site-footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; background: var(--surface); }
.footer-links a { color: var(--muted); }

@media (max-width: 600px) {
  .hero { padding-top: 24px; }
  .converter-card { padding: 8px; }
  .lede { font-size: 17px; }
}