:root {
  color-scheme: dark;
  --ink: #f4f0e8;
  --muted: #aaa69e;
  --deep: #111316;
  --panel: #1a1d21;
  --panel-2: #22262b;
  --line: #373c42;
  --lime: #d5fb65;
  --coral: #ff8072;
  --focus: #94bbff;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 85% 0%, #252a27 0, transparent 30rem), var(--deep);
}

button, textarea, input { font: inherit; }
button { cursor: pointer; }

.shell { width: min(100% - 40px, 920px); margin: 0 auto; padding: 28px 0 72px; }
.masthead { display: flex; justify-content: space-between; align-items: center; padding-bottom: 66px; color: var(--muted); font-size: 0.75rem; letter-spacing: .08em; text-transform: uppercase; }
.masthead p { margin: 0; }
.brand { color: var(--ink); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.05rem; font-weight: 500; letter-spacing: -.08em; text-decoration: none; }
.brand span { color: var(--lime); }
.intro { max-width: 670px; margin-bottom: 46px; }
.eyebrow, .step { margin: 0 0 10px; color: var(--lime); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .7rem; letter-spacing: .08em; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 650px; margin-bottom: 18px; font-size: clamp(2.45rem, 6vw, 4.6rem); line-height: 1.02; letter-spacing: -.065em; }
h2 { margin-bottom: 0; font-size: 1.35rem; letter-spacing: -.045em; }
.lede { max-width: 540px; margin-bottom: 0; color: var(--muted); font-size: 1rem; line-height: 1.65; }
.panel { border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(145deg, #1d2024, var(--panel)); padding: 28px; box-shadow: 0 20px 70px rgba(0, 0, 0, .14); }
.panel-heading, .section-heading { display: flex; justify-content: space-between; gap: 18px; align-items: start; margin-bottom: 26px; }
.local-badge { border: 1px solid #60732f; border-radius: 99px; padding: 6px 9px; color: var(--lime); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .62rem; letter-spacing: .06em; }
label { display: block; margin-bottom: 9px; color: #d2cec5; font-size: .78rem; font-weight: 700; }
.code-input, .key-input { width: 100%; border: 1px solid var(--line); border-radius: 7px; outline: none; color: var(--ink); background: #111315; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .87rem; line-height: 1.5; resize: vertical; transition: border-color .15s, box-shadow .15s; }
.code-input { padding: 13px 14px; }
.code-input:focus, .key-input:focus { border-color: var(--focus); box-shadow: 0 0 0 3px rgba(148, 187, 255, .14); }
.field-help, .message { margin: 8px 0 0; color: var(--muted); font-size: .76rem; line-height: 1.5; }
.error-message { color: var(--coral); }
.button { border: 1px solid transparent; border-radius: 7px; padding: 11px 15px; font-size: .8rem; font-weight: 800; letter-spacing: -.01em; transition: transform .15s, background .15s; }
.button:hover { transform: translateY(-1px); }
.button:focus-visible, .text-button:focus-visible, .remove-button:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.button-primary { margin-top: 22px; color: #172000; background: var(--lime); }
.button-primary span { margin-left: 4px; font-size: 1.1em; }
.editor { margin-top: 48px; }
.section-heading { align-items: end; margin-bottom: 17px; }
#key-count { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; font-weight: 400; }
.text-button { border: 0; padding: 4px 0; color: var(--lime); background: transparent; font-size: .75rem; font-weight: 800; }
.rule-card { display: flex; flex-wrap: wrap; gap: 7px 12px; align-items: baseline; border-left: 2px solid var(--lime); margin-bottom: 22px; padding: 9px 12px; color: var(--muted); background: rgba(213, 251, 101, .05); font-size: .76rem; line-height: 1.45; }
.rule-card strong { color: var(--ink); }
code { color: var(--lime); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; }
.keys-list { display: grid; gap: 12px; }
.key-row { position: relative; display: grid; grid-template-columns: 38px minmax(0, 1fr) 36px; gap: 10px; align-items: start; }
.key-number { padding-top: 12px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .72rem; text-align: center; }
.key-field { min-width: 0; }
.key-input { height: 42px; padding: 9px 11px; resize: none; }
.key-input.invalid { border-color: var(--coral); }
.row-error { min-height: 17px; margin: 4px 0 0; color: var(--coral); font-size: .7rem; }
.remove-button { width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 6px; padding: 0; color: var(--muted); background: var(--panel-2); font-size: 1.05rem; }
.remove-button:hover { border-color: var(--coral); color: var(--coral); }
.button-secondary { margin-top: 16px; border-color: var(--line); color: var(--ink); background: transparent; }
.output { margin-top: 44px; }
.status { padding-top: 2px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .68rem; letter-spacing: .03em; text-align: right; }
.status.valid { color: var(--lime); }
.status.invalid { color: var(--coral); }
.copy-row { display: flex; gap: 10px; align-items: stretch; }
.output-input { min-height: 72px; resize: none; }
.copy-button { flex: 0 0 auto; align-self: stretch; margin-top: 0; }

@media (max-width: 600px) {
  .shell { width: min(100% - 28px, 920px); padding-top: 21px; }
  .masthead { padding-bottom: 48px; }
  .masthead p { display: none; }
  .panel { padding: 20px; }
  .copy-row { display: block; }
  .copy-button { width: 100%; margin-top: 10px; }
  .section-heading { align-items: start; }
  .rule-card { display: block; }
  .rule-card > * { display: inline; margin-right: 5px; }
}