:root {
  --bg: #000;
  --fg: #fff;
  --muted: #8a8a8a;
  --line: #262626;
  --line-strong: #fff;
  --err: #ff5c5c;
  --ok: #22c55e;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; background: var(--bg); color: var(--fg); }

body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
}
.top nav a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
}
.top nav a:hover { color: var(--fg); }

main {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 56px 16px 64px;
  flex: 1;
}

.hero { margin-bottom: 40px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 12px;
}
h1 {
  font-family: var(--mono);
  font-size: clamp(40px, 11vw, 72px);
  line-height: 1;
  letter-spacing: 0.04em;
  margin: 0 0 16px;
}
.tagline { color: var(--muted); font-size: 17px; margin: 0; }

.card {
  border: 1px solid var(--line);
  padding: 20px;
  margin-bottom: 16px;
  transition: opacity .2s, border-color .2s;
}
.card-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
  font-family: var(--mono);
}
.card-head > span:first-child { color: var(--muted); font-size: 12px; }
h2 { font-size: 16px; font-weight: 600; margin: 0; flex: 1; }
.progress, .lock { font-size: 12px; color: var(--muted); }

.task {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.task-body { flex: 1; min-width: 0; }
.task-title { margin: 0 0 2px; font-weight: 500; }
.task-sub { margin: 0; color: var(--muted); font-size: 13px; }
.task.complete .task-title::before {
  content: "✓ ";
  font-family: var(--mono);
}
.task.complete .task-title::before { color: var(--ok); }
.task.complete .btn,
.task.complete .btn:hover { border-color: var(--ok); color: var(--ok); background: transparent; }

.btn {
  flex-shrink: 0;
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  padding: 9px 16px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--fg);
  text-decoration: none;
  cursor: pointer;
  text-align: center;
}
.btn:hover { background: var(--fg); color: var(--bg); }
.btn.solid { background: var(--fg); color: var(--bg); width: 100%; margin-top: 20px; padding: 12px; }
.btn.solid:hover { opacity: .85; }
.btn:disabled { opacity: .3; cursor: not-allowed; }

label {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 16px 0 6px;
}
input {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 14px;
  padding: 11px 12px;
  outline: none;
  border-radius: 0;
}
input:focus { border-color: var(--fg); }
input:disabled { opacity: .4; }
input.bad { border-color: var(--err); }
.inline { margin-top: 10px; }

.prefixed { display: flex; }
.prefixed span {
  border: 1px solid var(--line);
  border-right: 0;
  padding: 11px 10px 11px 12px;
  font-family: var(--mono);
  color: var(--muted);
}

.hint { color: var(--muted); font-size: 12px; margin: 6px 0 0; }
.err { color: var(--err); font-size: 12px; margin: 6px 0 0; min-height: 0; font-family: var(--mono); }
.err:empty { display: none; }

.locked { opacity: .45; }
.locked form { pointer-events: none; }
.unlocked { border-color: var(--fg); }

.done { border-color: var(--fg); }
.done h2 { font-size: 22px; margin-bottom: 12px; }
.mono { font-family: var(--mono); font-size: 13px; word-break: break-all; white-space: pre-line; margin: 0 0 12px; }

@media (max-width: 480px) {
  .task { flex-direction: column; }
  .task .btn { width: 100%; }
}