:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #17202a;
  --muted: #667085;
  --line: #d8dee5;
  --accent: #1f7a5c;
  --accent-dark: #155e46;
  --danger: #b42318;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}
a { color: inherit; }
.shell { display: grid; grid-template-columns: 240px minmax(0, 1fr); min-height: 100vh; }
.sidebar { background: #111827; color: #fff; padding: 24px 18px; }
.brand { font-weight: 700; font-size: 20px; margin-bottom: 28px; }
nav { display: grid; gap: 4px; }
nav a { color: #d1d5db; text-decoration: none; padding: 10px 12px; border-radius: 6px; }
nav a:hover { background: #1f2937; color: #fff; }
.content { padding: 32px; max-width: 1180px; width: 100%; }
.page-head { display: flex; justify-content: space-between; gap: 16px; align-items: center; margin-bottom: 22px; }
h1 { margin: 0; font-size: 30px; }
h2 { margin: 0 0 8px; font-size: 18px; }
p { margin-top: 0; }
.auth-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.auth-card, .panel, .row-card, table, .message, .stats-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.auth-card { width: min(420px, 100%); padding: 28px; }
.stack { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-weight: 600; }
input, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}
button, .button-link {
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  display: inline-block;
}
button:hover, .button-link:hover { background: var(--accent-dark); }
.alert, .success { padding: 12px 14px; border-radius: 6px; margin-bottom: 16px; }
.alert { background: #fef3f2; color: var(--danger); border: 1px solid #fecdca; }
.success { background: #ecfdf3; color: #027a48; border: 1px solid #abefc6; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.stats-grid article { padding: 18px; display: grid; gap: 8px; }
.stats-grid span, .muted, small { color: var(--muted); }
.stats-grid strong { font-size: 24px; }
.list { display: grid; gap: 12px; }
.row-card { padding: 14px; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.link-row { text-decoration: none; }
code {
  display: block;
  max-width: 760px;
  overflow-wrap: anywhere;
  color: #344054;
  margin-top: 4px;
}
.panel { padding: 18px; }
table { width: 100%; border-collapse: collapse; overflow: hidden; }
th, td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 650; background: #f8fafc; }
.toolbar { display: flex; gap: 10px; margin-bottom: 16px; }
.grid-form { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)) auto; gap: 10px; margin-bottom: 16px; }
.messages { display: grid; gap: 12px; margin-bottom: 16px; }
.message { padding: 14px; max-width: 760px; }
.message.admin { border-color: #b7e4d3; }
.message.user { margin-left: auto; }
.inline-form { margin-top: 12px; }

@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 0; z-index: 10; padding: 14px; }
  .brand { margin-bottom: 10px; }
  nav { display: flex; overflow-x: auto; white-space: nowrap; }
  .content { padding: 18px; }
  .page-head, .row-card, .toolbar { flex-direction: column; align-items: stretch; }
  .grid-form { grid-template-columns: 1fr; }
  table { display: block; overflow-x: auto; }
}