:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1b1f24;
  --muted: #6b7280;
  --line: #e3e6ea;
  --accent: #2563eb;
  --ok-bg: #e7f6ec; --ok-ink: #17692f;
  --warn-bg: #fdf3d8; --warn-ink: #7a5a06;
  --err-bg: #fdeaea; --err-ink: #a01c1c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 600; }
.who { margin-left: auto; color: var(--muted); }
.logout { color: var(--accent); text-decoration: none; }
.logout:hover { text-decoration: underline; }

main { max-width: 940px; margin: 0 auto; padding: 24px 18px 48px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
  margin-bottom: 20px;
}
.card.centered { max-width: 460px; margin: 12vh auto 0; text-align: center; }

h1 { font-size: 20px; margin: 0 0 6px; }
h2 { font-size: 16px; margin: 0 0 14px; }
.muted { color: var(--muted); font-size: 13px; }

.drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px;
  min-height: 130px;
  margin: 16px 0;
  padding: 20px;
  border: 2px dashed var(--line);
  border-radius: 10px;
  background: #fafbfc;
  cursor: pointer;
  text-align: center;
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: #f2f6ff; }
.drop.bad { border-color: var(--err-ink); background: var(--err-bg); }
.drop input { display: none; }
.drop-title { font-weight: 500; }

.btn {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: #1d4fd8; color: #fff; }
.btn.primary:disabled { background: var(--muted); border-color: var(--muted); cursor: default; }
.btn.big { padding: 12px 22px; margin-top: 16px; }

.alert { padding: 11px 14px; border-radius: 8px; margin: 0 0 18px; font-size: 14px; }
.alert.ok { background: var(--ok-bg); color: var(--ok-ink); }
.alert.warn { background: var(--warn-bg); color: var(--warn-ink); }
.alert.error { background: var(--err-bg); color: var(--err-ink); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
td.num { white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }

.tag {
  display: inline-block;
  padding: 1px 7px; margin-left: 6px;
  border-radius: 20px;
  background: var(--line); color: var(--muted);
  font-size: 11px; text-transform: uppercase; letter-spacing: .04em;
}
.tag.warn { background: var(--warn-bg); color: var(--warn-ink); }

@media (max-width: 560px) {
  .topbar { flex-wrap: wrap; }
  .who { margin-left: 0; width: 100%; }
}