:root {
  --background: oklch(1 0 0);
  --foreground: oklch(0.145 0 0);
  --card: oklch(1 0 0);
  --muted: oklch(0.97 0 0);
  --muted-foreground: oklch(0.556 0 0);
  --primary: oklch(0.205 0 0);
  --primary-foreground: oklch(0.985 0 0);
  --border: oklch(0.922 0 0);
  --input: oklch(0.922 0 0);
  --sidebar: oklch(0.985 0 0);
  --danger: oklch(0.577 0.245 27.325);
  --radius: 0.625rem;
  color: var(--foreground);
  background: var(--background);
  font-family: "Geist", ui-sans-serif, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; }
h1 { font-size: 1.6rem; font-weight: 560; letter-spacing: -0.02em; margin: 0 0 8px; }
h2 { font-size: 1.05rem; font-weight: 560; margin: 28px 0 8px; }
.hint, .nav-label { color: var(--muted-foreground); }
.nav-label { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; margin: 18px 12px 8px; }
.brand { font-weight: 640; letter-spacing: -0.03em; margin: 4px 12px 8px; }

.shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 16rem;
  flex: none;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar a {
  display: block;
  text-decoration: none;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 500;
}
.sidebar a.active, .sidebar a:hover { background: var(--muted); }
.sign-out { margin-top: auto; }
main { flex: 1; max-width: 880px; padding: 32px 28px 64px; }

label { display: flex; flex-direction: column; gap: 6px; margin-top: 14px; color: var(--muted-foreground); font-size: 0.92rem; }
input[type=text], input[type=password], input[type=file], select {
  width: 100%;
  border: 1px solid var(--input);
  background: transparent;
  color: var(--foreground);
  border-radius: var(--radius);
  padding: 8px 10px;
  font: inherit;
}
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  height: 36px;
  padding: 0 14px;
  border: 0;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--primary-foreground);
  font: inherit;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
}
.row { display: flex; gap: 8px; align-items: center; margin-top: 8px; }
.row input { margin: 0; }
.row button { margin-top: 0; }
.error { background: color-mix(in oklch, var(--danger) 12%, white); color: var(--danger); padding: 8px 10px; border-radius: var(--radius); }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px 18px; margin: 18px 0; }
.plain { list-style: none; padding: 0; }
.plain li { display: flex; gap: 12px; align-items: center; }
.plain form, .plain button { margin: 0; }
trix-editor { background: white; border: 1px solid var(--border); border-radius: var(--radius); }

.login-page { min-height: 100vh; background: var(--foreground); }
.login-stage { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 40px 16px; }
.login-card {
  width: min(32rem, 100%);
  background: var(--card);
  color: var(--foreground);
  border-radius: 16px;
  padding: 40px 36px;
}
.login-card h1 { font-size: 1.7rem; font-weight: 500; }
.login-card button { width: 100%; height: 40px; }

@media (max-width: 760px) {
  .shell { display: block; }
  .sidebar { width: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .sign-out { margin-top: 12px; }
}