:root {
  color-scheme: light;
  --ink: #142b38;
  --muted: #5d727d;
  --line: #d9e4e8;
  --surface: #ffffff;
  --canvas: #f2f6f7;
  --accent: #087f8c;
  --accent-dark: #06636d;
  --danger: #a53838;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--canvas); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.topbar { min-height: 64px; display: flex; align-items: center; gap: 24px; padding: 0 4vw; background: var(--surface); border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); font-weight: 750; letter-spacing: .01em; white-space: nowrap; }
.topbar nav { display: flex; gap: 20px; flex: 1; }
.topbar form { margin: 0; }
.page-shell { width: min(1120px, calc(100% - 40px)); margin: 36px auto 80px; }
.page-heading { margin-bottom: 24px; }
h1 { margin: 4px 0 8px; font-size: clamp(1.8rem, 3vw, 2.6rem); line-height: 1.15; }
h2 { margin: 0 0 14px; font-size: 1.12rem; }
.eyebrow { margin: 0; color: var(--accent-dark); font-size: .74rem; font-weight: 800; letter-spacing: .14em; }
.muted { color: var(--muted); }
.notice-card, .table-card, .login-card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 24px; box-shadow: 0 10px 28px rgba(20, 43, 56, .04); }
.notice-card, .table-card { margin-top: 18px; }
.login-card { width: min(460px, 100%); margin: 8vh auto 0; padding: 32px; }
.stack-form { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.stack-form > * { min-width: 0; }
label { display: grid; gap: 6px; font-weight: 650; }
input, select { width: 100%; min-height: 44px; border: 1px solid #b8cbd2; border-radius: 8px; padding: 9px 11px; background: #fff; color: var(--ink); font: inherit; }
input:focus { outline: 3px solid rgba(8, 127, 140, .2); border-color: var(--accent); }
button { min-height: 42px; border: 0; border-radius: 8px; padding: 9px 16px; font: inherit; font-weight: 700; cursor: pointer; }
.primary-button { background: var(--accent); color: #fff; }
.primary-button:hover { background: var(--accent-dark); }
.quiet-button { background: transparent; color: var(--ink); }
.error-message { color: var(--danger); }
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 11px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-size: .85rem; }
.preview-box { min-height: 36px; max-height: 340px; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--ink); background: #f7fafb; border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 14px 0; }
.metrics-grid > div { display: grid; gap: 4px; padding: 12px; background: #f7fafb; border: 1px solid var(--line); border-radius: 8px; }
.metrics-grid span { color: var(--muted); font-size: .88rem; }
.metrics-grid strong { font-size: 1.12rem; font-variant-numeric: tabular-nums; }
.import-preview { max-height: 420px; overflow: auto; margin: 16px 0; }
.import-preview table { font-size: .9rem; }
button[hidden] { display: none; }
button:disabled { opacity: .6; cursor: progress; }

@media (max-width: 720px) {
  .topbar { flex-wrap: wrap; gap: 10px 18px; padding: 14px 20px; }
  .topbar nav { order: 3; width: 100%; overflow-x: auto; gap: 18px; }
  .topbar form { margin-left: auto; }
  .page-shell { width: min(100% - 28px, 680px); margin-top: 22px; }
  .table-card, .notice-card { padding: 18px; }
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  .page-shell { width: calc(100% - 20px); margin-top: 16px; }
  .login-card { margin-top: 5vh; padding: 22px; }
  .topbar nav { gap: 14px; }
  .primary-button { width: 100%; }
  th, td { padding: 9px 10px; }
}