:root {
  --bg: #f4f5fa;
  --card: #ffffff;
  --text: #1c2033;
  --muted: #6b7088;
  --line: #e4e6ef;
  --accent: #5146e5;
  --accent-soft: #eceafd;
  --good: #16a34a;
  --ok: #d99a06;
  --bad: #dc2626;
  --warn-bg: #fff7e6;
  --warn-line: #f5d58a;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(20, 24, 50, 0.05), 0 8px 24px rgba(20, 24, 50, 0.06);
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1120;
    --card: #181b2e;
    --text: #e8e9f3;
    --muted: #9a9fbb;
    --line: #2a2e47;
    --accent: #8b83ff;
    --accent-soft: #25264a;
    --warn-bg: #2d2513;
    --warn-line: #6b5520;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

.demo-banner {
  padding: 9px 16px;
  background: var(--accent-soft);
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem;
  text-align: center;
}
.demo-banner a { font-weight: 600; white-space: nowrap; }

.topbar {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px 24px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand h1 { margin: 0; font-size: 1.45rem; letter-spacing: -0.02em; }
.brand p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.logo { width: 42px; height: 42px; }
.logo rect { fill: var(--accent); }
.logo path { stroke: #fff; stroke-width: 2.6; stroke-linecap: round; fill: none; }

.rubric-tag {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
}

.layout {
  max-width: 1240px;
  margin: 0 auto;
  padding: 16px 24px 24px;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 24px;
  align-items: start;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.input-card { position: sticky; top: 16px; }

label { font-weight: 600; font-size: 0.92rem; }
.field-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }

textarea, input {
  width: 100%;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
textarea { resize: vertical; min-height: 260px; }
textarea:focus, input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.row { display: flex; gap: 16px; align-items: flex-end; margin-top: 16px; flex-wrap: wrap; }
.field { flex: 1 1 180px; display: grid; gap: 6px; }
.actions { display: flex; gap: 10px; }

button { font: inherit; cursor: pointer; border-radius: 12px; }
.primary {
  background: var(--accent);
  color: #fff;
  border: 0;
  padding: 12px 20px;
  font-weight: 600;
}
.primary:hover { filter: brightness(1.08); }
.primary:disabled { opacity: 0.6; cursor: progress; }
.ghost { background: transparent; border: 1px solid var(--line); color: var(--text); padding: 12px 16px; }

.samples { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 16px; font-size: 0.9rem; }
.chip-button {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  padding: 5px 12px;
  border-radius: 999px;
}
.chip-button:hover { border-color: var(--accent); color: var(--accent); }

.error { color: var(--bad); margin: 14px 0 0; font-weight: 500; }

.engine-status { display: flex; align-items: center; gap: 8px; margin: 14px 0 0; font-size: 0.85rem; color: var(--muted); }
.engine-dot { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--ok); animation: pulse 1.2s ease-in-out infinite; }
.engine-status[data-state="ready"] .engine-dot { background: var(--good); animation: none; }
.engine-status[data-state="error"] { color: var(--bad); }
.engine-status[data-state="error"] .engine-dot { background: var(--bad); animation: none; }
@keyframes pulse { 50% { opacity: 0.25; } }

.rubric { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 14px; font-size: 0.92rem; }
.rubric summary { cursor: pointer; font-weight: 600; }
.rubric ul { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 6px; }
.rubric li { display: flex; justify-content: space-between; color: var(--muted); }

.empty { text-align: center; padding: 64px 16px; }
.empty svg { width: 72px; height: 72px; fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; opacity: 0.6; }
.empty h2 { margin: 12px 0 6px; font-size: 1.2rem; }

.summary { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }
.ring { position: relative; width: 148px; height: 148px; flex: none; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 12; }
.ring .track { stroke: var(--line); }
.ring .value { stroke-linecap: round; transition: stroke-dashoffset 0.8s ease; }
.ring .label { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.ring .number { font-size: 2.3rem; font-weight: 700; letter-spacing: -0.03em; line-height: 1; }
.ring .of { color: var(--muted); font-size: 0.8rem; }

.headline h2 { margin: 0 0 4px; font-size: 1.35rem; }
.grade { display: inline-block; font-weight: 700; padding: 4px 12px; border-radius: 999px; color: #fff; margin-bottom: 10px; }
.stats { display: flex; gap: 8px; flex-wrap: wrap; }

.chip {
  display: inline-flex;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.8rem;
}
.chip b { font-weight: 600; }

.warnings { margin-top: 18px; background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 12px; padding: 10px 14px; font-size: 0.9rem; }
.warnings ul { margin: 0; padding-left: 18px; }

.improve { margin-top: 20px; }
.improve h3, .criteria h3 { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; }
.improve ol { margin: 0; padding-left: 20px; display: grid; gap: 6px; }

.criteria { margin-top: 24px; display: grid; gap: 14px; }
.criterion { border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; }
.criterion-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.criterion-head h4 { margin: 0; font-size: 1.02rem; }
.criterion-head .pts { font-weight: 700; font-variant-numeric: tabular-nums; }
.bar { height: 8px; border-radius: 999px; background: var(--line); overflow: hidden; margin: 10px 0 4px; }
.bar span { display: block; height: 100%; border-radius: inherit; transition: width 0.8s ease; }
.bar.small { height: 5px; margin: 6px 0; }

.check { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--line); }
.check-head { display: flex; justify-content: space-between; font-size: 0.92rem; font-weight: 600; }
.check-head .pts { color: var(--muted); font-variant-numeric: tabular-nums; }
.check p { margin: 6px 0 8px; font-size: 0.92rem; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.unscored { color: var(--muted); font-style: italic; }

.footer { text-align: center; font-size: 0.85rem; padding: 8px 16px 32px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .input-card { position: static; }
}

@media (max-width: 520px) {
  .topbar { padding: 20px 16px 4px; }
  .layout { padding: 12px 16px 20px; gap: 16px; }
  .card { padding: 18px; }
  textarea { min-height: 0; height: 200px; }
  .summary { gap: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .engine-dot, .ring .value, .bar span { animation: none; transition: none; }
}