/* Accessible dark theme with green accent */
:root {
  --bg: #0f1216;
  --bg-alt: #151a21;
  --card: #1a2029;
  --text: #e7edf3;
  --muted: #a3b1c2;
  --error: #ff6b6b;
  --warn: #f2c94c;
  --info: #56ccf2;
  --ok: #34d399;
  --accent: #22c55e; /* green */
  --accent-600: #16a34a;
  --border: #2a3340;
  --focus: #93c5fd;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #0b0d11 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.5;
}
img { display: block; }
a { color: var(--info); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: rgba(15,18,22,0.85); backdrop-filter: blur(8px);
}
.brand { display: flex; gap: 12px; align-items: center; }
.app-title { margin: 0; font-size: 1.2rem; letter-spacing: 0.2px; }
.app-sub { margin: 0; color: var(--muted); font-size: 0.9rem; }
.app-nav a { margin-left: 14px; color: var(--text); opacity: 0.85; }
.app-nav a:hover { opacity: 1; }

.container { max-width: 1000px; margin: 24px auto; padding: 0 16px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin-bottom: 16px; box-shadow: 0 10px 24px rgba(0,0,0,0.25);
}
.card h2, .card h3, .card h4 { margin-top: 4px; }
.card.empty { text-align: center; color: var(--muted); }

.grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
.field { display: flex; flex-direction: column; grid-column: span 3; }
.field.checkbox { flex-direction: row; align-items: center; gap: 8px; grid-column: span 2; }
.field label { color: var(--muted); margin-bottom: 6px; font-size: 0.95rem; }
.field input[type=text], .field input[type=number], .field input[type=email] {
  background: var(--bg); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 10px 12px; outline: none;
}
.field input:focus { border-color: var(--focus); box-shadow: 0 0 0 3px rgba(147,197,253,0.25); }

.actions { margin-top: 10px; display: flex; gap: 10px; }
.btn { background: var(--accent); color: #07140b; font-weight: 600; border: none; border-radius: 8px; padding: 10px 14px; cursor: pointer; }
.btn:hover { background: var(--accent-600); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { border-color: var(--muted); }

.alert { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); }
.alert.info { background: rgba(86,204,242,0.08); border-color: #2b91ae; }
.alert.warn { background: rgba(242,201,76,0.08); border-color: #9c7b1a; }
.alert.error { background: rgba(255,107,107,0.08); border-color: #9c2b2b; }

.result-header { display: flex; gap: 16px; align-items: center; }
.grade { width: 64px; height: 64px; display: grid; place-items: center; font-weight: 800; font-size: 1.6rem; border-radius: 12px; }
.grade-a { background: rgba(34,197,94,0.15); color: #86efac; border: 1px solid #245a36; }
.grade-b { background: rgba(59,130,246,0.1); color: #bfdbfe; border: 1px solid #1e40af; }
.grade-c { background: rgba(234,179,8,0.1); color: #fde68a; border: 1px solid #854d0e; }
.grade-d { background: rgba(249,115,22,0.1); color: #fdba74; border: 1px solid #9a3412; }
.grade-f { background: rgba(239,68,68,0.1); color: #fecaca; border: 1px solid #7f1d1d; }
.badge { padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); font-weight: 700; }

.kv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 12px; }
.kv div { background: var(--bg-alt); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
.kv div span { display: block; color: var(--muted); font-size: 0.85rem; }

.chain summary { cursor: pointer; }
.chain ol { margin: 8px 0 0; padding-left: 22px; }
.ok-line { color: var(--ok); font-weight: 600; margin-top: 8px; }
.issues ul { margin: 8px 0 0; }

.export-actions { margin-top: 12px; display: flex; gap: 8px; }
.ai-tip { margin-top: 12px; padding: 10px; background: rgba(34,197,94,0.08); border: 1px solid #1f5b37; border-radius: 8px; }

.table { width: 100%; display: grid; }
.thead, .trow { display: grid; grid-template-columns: 2fr 2fr 1fr 1fr 4fr; gap: 10px; }
.thead { color: var(--muted); font-size: 0.9rem; }
.trow { padding: 8px 0; border-bottom: 1px dashed var(--border); }
.ellipsis { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.footer { text-align: center; color: var(--muted); padding: 24px; }

.muted { color: var(--muted); }

@media (max-width: 840px) {
  .grid { grid-template-columns: 1fr; }
  .field, .field.checkbox { grid-column: span 1; }
  .kv { grid-template-columns: 1fr; }
  .thead, .trow { grid-template-columns: 1fr 1fr 1fr; }
  .thead > :nth-child(n+4), .trow > :nth-child(n+4) { display: none; }
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }