:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --card-bg: #ffffff;
  --card-border: #e5e5e5;
  --input-bg: #ffffff;
  --input-border: #d4d4d4;
  --input-focus: #4977ff;
  --btn-fg: #ffffff;
  --btn-bg: #1a1a1a;
  --btn-bg-hover: #2a2a2a;
  --topbar-bg: #2d2d2d;
  --topbar-fg: #ffffff;
  --link-hover: #6b9aff;
  --selected-fg: #b8b8b8;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    sans-serif;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
}
a {
  color: #2459d8;
}

/* ─── Topbar (dark) ────────────────────────────────────────────── */
header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 2rem;
  background: var(--topbar-bg);
  color: var(--topbar-fg);
}
header.topbar .brand {
  color: var(--topbar-fg);
  text-decoration: none;
}
header.topbar .brand h1 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  font-weight: 600;
}
header.topbar nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.9rem;
}
header.topbar nav .nav-item {
  color: var(--topbar-fg);
  text-decoration: none;
  background: transparent;
  border: 0;
  padding: 0;
  font: inherit;
  cursor: pointer;
}
header.topbar nav .nav-item:hover {
  color: var(--link-hover);
}
header.topbar nav .nav-item.selected,
header.topbar nav .nav-item.selected:hover {
  color: var(--selected-fg);
  cursor: default;
}

/* ─── Main page body (light) ───────────────────────────────────── */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem;
}
h2 {
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  font-weight: 600;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 0.75rem;
}
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.muted {
  color: var(--muted);
  font-size: 0.875rem;
}

/* ─── Inputs ───────────────────────────────────────────────────── */
input[type="text"],
input[type="password"],
input[type="email"],
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.7rem;
  background: var(--input-bg);
  color: inherit;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  font: inherit;
}
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--input-focus);
  outline-offset: 0;
}
textarea {
  min-height: 5rem;
  resize: vertical;
}

/* ─── Buttons ──────────────────────────────────────────────────── */
button.btn,
a.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 0;
  border-radius: 6px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
}
button.btn:hover,
a.btn:hover {
  background: var(--btn-bg-hover);
}
button.ghost {
  background: transparent;
  border: 1px solid var(--card-border);
  color: inherit;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
button.ghost:hover {
  background: #f0f0f0;
}
button.danger {
  background: #fee2e2;
  border: 1px solid #f5c2c2;
  color: #8a1c1c;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
button.danger:hover {
  background: #fecaca;
}

form .row {
  margin-top: 0.75rem;
}
.error {
  color: #b91c1c;
  font-size: 0.875rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

/* ─── Hero (root + marketing) ──────────────────────────────────── */
main.hero {
  max-width: 760px;
  text-align: left;
}
main.hero h2 {
  font-size: 2.2rem;
}
main.hero .lede {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 56ch;
}