:root {
  --brand: #7C3AED;
  --brand-2: #E85C95;
  --bg: #faf8ff;
  --surface: #ffffff;
  --text: #1c1b1f;
  --muted: #615e6b;
  --border: #ece7f6;
  --shadow: 0 12px 44px rgba(80, 40, 140, .08);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0d14;
    --surface: #16131d;
    --text: #ece9f1;
    --muted: #9b96a8;
    --border: #272234;
    --shadow: 0 12px 44px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(1100px 420px at 50% -160px, rgba(124, 58, 237, .20), transparent 70%),
    radial-gradient(900px 360px at 100% -120px, rgba(232, 92, 149, .12), transparent 65%),
    var(--bg);
  font: 16px/1.7 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px 72px; }

/* Brand header */
header.brand { text-align: center; padding: 48px 0 28px; }
.brand .logo {
  display: inline-block;
  font-size: 28px; font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand .tag { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 30px 28px;
  box-shadow: var(--shadow);
}

/* Typography */
h1 { font-size: 27px; line-height: 1.25; margin: 0 0 6px; letter-spacing: -.01em; }
h2 { font-size: 19px; margin: 32px 0 8px; letter-spacing: -.01em; }
h3 { font-size: 16px; margin: 22px 0 6px; }
p, li { color: var(--text); }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 26px; }
.note { color: var(--muted); margin: 0 0 22px; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 20px; }
li { margin: 4px 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
code { background: rgba(124, 58, 237, .12); padding: 1px 6px; border-radius: 6px; font-size: .9em; }
strong { font-weight: 700; }

/* Index nav cards */
.nav { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.nav a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 17px 18px; border: 1px solid var(--border); border-radius: 15px;
  background: var(--surface); color: var(--text); font-weight: 600;
  box-shadow: var(--shadow);
  transition: transform .16s ease, border-color .16s ease;
}
.nav a:hover { transform: translateY(-2px); border-color: var(--brand); text-decoration: none; }
.nav a::after { content: "→"; color: var(--brand); font-weight: 700; }

/* Form */
label { display: block; font-weight: 600; font-size: 14px; margin: 18px 0 7px; }
input, textarea {
  width: 100%; padding: 14px 15px; font: inherit; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 13px;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus, textarea:focus {
  outline: none; border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, .16);
}
textarea { min-height: 150px; resize: vertical; }
button {
  margin-top: 24px; width: 100%; padding: 16px; font: inherit; font-weight: 800; color: #fff;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
  border: none; border-radius: 15px; cursor: pointer;
  box-shadow: 0 10px 26px rgba(124, 58, 237, .32);
  transition: opacity .15s ease, transform .1s ease;
}
button:hover { opacity: .95; }
button:active { transform: translateY(1px); }
button:disabled { opacity: .6; box-shadow: none; cursor: default; }
.status { margin-top: 16px; font-weight: 600; min-height: 1.2em; }
.status.ok { color: #2EA37C; }
.status.err { color: #D64556; }

/* Footer */
footer { text-align: center; margin-top: 34px; color: var(--muted); font-size: 13px; }
footer a { margin: 0 9px; color: var(--muted); }
footer a:hover { color: var(--brand); }