/* $ Design tokens */
:root {
  --bg: #f7f9fb;
  --panel: #ffffff;
  --text: #111827;
  --muted: #5b6776;
  --accent: #0b6bcb;
  --warning: #c98a00;
  --danger: #b00020;
  --border: #e6e9ee;
  --radius: 14px;
  --shadow: 0 8px 22px rgba(20,30,60,.08);
}

.theme-dark {
  --bg: #0f1216;
  --panel: #161b22;
  --text: #e6edf3;
  --muted: #93a6b8;
  --accent: #4aa3ff;
  --warning: #ffca28;
  --danger: #ff6b6b;
  --border: #233041;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

html, body { height: 100%; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background: var(--bg);
}

/* Layout */
.appbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; gap: 12px; align-items: center;
  background: var(--panel); border-bottom: 1px solid var(--border);
  padding: 10px 14px; box-shadow: var(--shadow);
}
.appbrand { font-weight: 800; }
.spacer { flex: 1; }
.theme-switch select { margin-left: 8px; }

.layout {
  display: grid; grid-template-columns: 420px 1fr; gap: 16px;
  max-width: 1280px; margin: 16px auto; padding: 0 16px;
}
.pane {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 14px;
}

/* Inputs */
.paste {
  width: 100%; min-height: 120px;
  border: 1px solid var(--border);
  border-radius: 12px; padding: 10px;
  background: transparent; color: var(--text);
}
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.more { margin-top: 6px; }
.actions { display: flex; gap: 8px; align-items: center; margin: 8px 0; }

.btn {
  padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent; color: var(--text);
  cursor: pointer;
}
.btn.primary {
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--accent) 85%, transparent),
    color-mix(in oklab, var(--accent) 35%, transparent));
  border: none; color: white;
}
.btn.ghost { opacity: .9; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

/* Chips */
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.chip {
  border: 1px solid var(--border); border-radius: 999px;
  padding: 4px 10px; font-size: 12px;
  background: color-mix(in oklab, var(--accent) 8%, transparent);
}

/* Grades */
.grades { display: flex; gap: 10px; flex-wrap: wrap; }
.status { font-size: 13px; color: var(--muted); min-height: 20px; }

/* Right panel */
.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; }
.results { display: grid; gap: 12px; }
.empty {
  padding: 16px; border: 1px dashed var(--border);
  border-radius: 12px; color: var(--muted);
}

/* Cards */
.card {
  border: 1px solid var(--border); border-radius: 12px;
  padding: 12px; background: color-mix(in oklab, var(--panel) 85%, white 15%);
}
.card h4 { margin: 0 0 4px; }
.meta { display: flex; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 12px; }

.badge {
  display: inline-block; padding: 2px 8px;
  border-radius: 999px; border: 1px solid var(--border);
  font-weight: 700; font-size: 12px;
}
.badge.grade-A { background: #2e7d32; color: white; border-color: transparent; }
.badge.grade-B { background: #1976d2; color: white; border-color: transparent; }
.badge.grade-C, .badge.grade-I { background: #ffb300; color: black; }
.badge.grade-D { background: #d32f2f; color: white; border-color: transparent; }

.fold > summary { cursor: pointer; font-weight: 600; margin-top: 6px; }
.footer { max-width: 1280px; margin: 18px auto 28px; padding: 0 16px; color: var(--muted); }

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
}