:root {
  --bg: #0f1722;
  --card: #16202e;
  --card-border: #243246;
  --text: #e8edf4;
  --muted: #90a2b8;
  --accent: #38bdf8;
  --accent-dark: #0ea5e9;
  --ok: #34d399;
  --err: #f87171;
  --warn: #fbbf24;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

header {
  background: linear-gradient(135deg, #16202e, #1b2a3f);
  border-bottom: 1px solid var(--card-border);
  padding: 18px 0;
}
.header-row { display: flex; align-items: baseline; gap: 16px; }
.brand { font-size: 1.5rem; font-weight: 700; }
.brand-mark { color: var(--accent); margin-right: 6px; }
.tagline { color: var(--muted); }

main { padding: 28px 0 48px; }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 24px 28px;
  margin-bottom: 24px;
}
.card h2 { margin: 0 0 6px; font-size: 1.15rem; }
.card h3 { margin: 22px 0 8px; font-size: 1rem; }
.optional { color: var(--muted); font-weight: 400; font-size: 0.85em; }
.hint { color: var(--muted); font-size: 0.85rem; margin: 4px 0 14px; }
.muted { color: var(--muted); font-size: 0.85rem; }
.hidden { display: none; }

/* dropzone */
.dropzone {
  border: 2px dashed #33465f;
  border-radius: 10px;
  padding: 26px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover, .dropzone.dragging { border-color: var(--accent); background: #1a2940; }
.dropzone p { margin: 4px 0; }

.status { margin-top: 12px; padding: 10px 14px; border-radius: 8px; font-size: 0.9rem; }
.status.working { background: #1d2c44; color: var(--warn); }
.status.ok { background: #11302a; color: var(--ok); }
.status.error { background: #371e22; color: var(--err); }

/* form */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 8px;
}
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.85rem; color: var(--muted); }
input, select {
  background: #0e1622;
  border: 1px solid #2c3d55;
  border-radius: 7px;
  color: var(--text);
  padding: 9px 10px;
  font-size: 0.95rem;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }

table { width: 100%; border-collapse: collapse; }
#pieces-table th {
  text-align: left; font-size: 0.78rem; color: var(--muted);
  font-weight: 500; padding: 4px 6px;
}
#pieces-table td { padding: 4px 6px; }
#pieces-table input { width: 100%; }
.btn-remove {
  background: none; border: none; color: var(--muted);
  cursor: pointer; font-size: 1rem; padding: 6px;
}
.btn-remove:hover { color: var(--err); }

.btn-secondary {
  margin-top: 8px;
  background: none; border: 1px solid #2c3d55; color: var(--accent);
  border-radius: 7px; padding: 8px 14px; cursor: pointer; font-size: 0.9rem;
}
.btn-secondary:hover { border-color: var(--accent); }

.checks { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 12px; }
.checks .check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); font-size: 0.9rem; }
.checks input[type="checkbox"] { accent-color: var(--accent-dark); width: 16px; height: 16px; }

.weights-preview { margin: 16px 0 4px; color: var(--muted); font-size: 0.92rem; }
.weights-preview strong { color: var(--text); }

.actions { margin-top: 16px; }
.btn-primary {
  background: var(--accent-dark);
  border: none; color: #fff; font-weight: 600;
  border-radius: 8px; padding: 12px 26px; font-size: 1rem; cursor: pointer;
}
.btn-primary:hover { background: var(--accent); }
.btn-primary:disabled { opacity: 0.6; cursor: wait; }

/* results */
.summary-bar {
  display: flex; flex-wrap: wrap; gap: 22px;
  background: #101b2a; border: 1px solid var(--card-border);
  border-radius: 10px; padding: 14px 18px; margin: 12px 0 20px;
}
.summary-bar div { display: flex; flex-direction: column; }
.summary-bar .muted { font-size: 0.75rem; }

.option {
  border: 1px solid var(--card-border);
  border-radius: 10px; padding: 16px 18px; margin-bottom: 14px;
}
.option.best { border-color: var(--ok); }
.option-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.option-total { font-size: 1.45rem; font-weight: 700; color: var(--accent); white-space: nowrap; }
.badge {
  background: var(--ok); color: #06281e; font-size: 0.7rem; font-weight: 700;
  padding: 2px 8px; border-radius: 999px; margin-left: 8px; vertical-align: middle;
}
.breakdown { margin-top: 12px; font-size: 0.88rem; }
.breakdown td { padding: 4px 6px; border-top: 1px solid #1f2c3f; }
.breakdown .num { text-align: right; white-space: nowrap; }
.breakdown .total-row td { border-top: 2px solid #33465f; font-weight: 700; }

footer { padding: 18px 0 32px; }

@media (max-width: 720px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .summary-bar { gap: 14px; }
  .option-head { flex-direction: column; }
}