:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #5d6470;
  --line: #d9dce1;
  --primary: #1f7a4d;
  --primary-text: #ffffff;
  --danger: #c0392b;
  --focus: #2f6fdb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --card: #1f2226;
    --text: #eceef1;
    --muted: #a0a7b2;
    --line: #353a41;
    --primary: #2e9e66;
    --danger: #e0584a;
    --focus: #6d9bf0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 420px;
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  text-align: center;
}

h1 { margin: 0 0 4px; font-size: 1.6rem; overflow-wrap: anywhere; }
.eyebrow { margin: 0 0 4px; color: var(--muted); font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
.muted { margin: 0 0 20px; color: var(--muted); overflow-wrap: anywhere; }

form { display: grid; gap: 14px; text-align: left; }
label { display: grid; gap: 4px; font-size: .9rem; color: var(--muted); }
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

button {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: .55; cursor: default; }
button.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
button.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.actions { display: grid; gap: 10px; margin-top: 20px; }
.status { margin: 16px 0 0; font-size: 1.15rem; font-weight: 600; }
.timer { margin: 4px 0 0; color: var(--muted); font-variant-numeric: tabular-nums; }