:root {
  color-scheme: light dark;
  --bg: #f4f7f6;
  --surface: #ffffff;
  --text: #16201d;
  --muted: #5b6b66;
  --line: #d8e2df;
  --accent: #087f5b;
  --accent-strong: #056246;
  --accent-text: #ffffff;
  --shadow: 0 18px 50px rgb(20 50 40 / 9%);
}

:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1513;
  --surface: #17201d;
  --text: #eff8f4;
  --muted: #a5b9b2;
  --line: #32443e;
  --accent: #42d3a1;
  --accent-strong: #2bb587;
  --accent-text: #04120d;
  --shadow: 0 18px 50px rgb(0 0 0 / 30%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1513;
    --surface: #17201d;
    --text: #eff8f4;
    --muted: #a5b9b2;
    --line: #32443e;
    --accent: #42d3a1;
    --accent-strong: #2bb587;
    --accent-text: #04120d;
    --shadow: 0 18px 50px rgb(0 0 0 / 30%);
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(
      circle at 20% 0%,
      color-mix(in srgb, var(--accent) 12%, transparent),
      transparent 34rem
    ),
    var(--bg);
}

.topbar {
  min-height: 4.5rem;
  padding: 1rem clamp(1rem, 5vw, 4rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
}

.brand {
  color: var(--accent);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.preferences {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.theme-control,
.language-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: 0.85rem;
  font-weight: 700;
}

.theme-control select,
.language-control select {
  width: auto;
}

.shell {
  width: min(72rem, calc(100% - 2rem));
  margin: clamp(2rem, 7vw, 6rem) auto;
}

.shell.narrow {
  width: min(46rem, calc(100% - 2rem));
}

.card {
  padding: clamp(1.4rem, 4vw, 2.6rem);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card h1 {
  margin: 0.25rem 0 1rem;
  font-size: clamp(2rem, 5vw, 3.6rem);
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.muted {
  color: var(--muted);
  line-height: 1.55;
}

form {
  margin-top: 1.75rem;
}

form label {
  display: block;
  margin: 1.2rem 0 0.45rem;
  font-weight: 700;
}

form label span {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 500;
}

input,
select {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

button {
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.72rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.7rem;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  font: inherit;
  font-weight: 750;
}

button:hover {
  background: var(--accent-strong);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 2px;
}

.footnote {
  margin: 1.25rem 0 0;
  font-size: 0.9rem;
}

@media (max-width: 760px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .preferences {
    align-items: flex-start;
    width: 100%;
  }
}