:root {
  --bg: #0e1a18;
  --bg2: #12242100;
  --panel: #14262322;
  --card: #16302b;
  --line: #24433c;
  --ink: #eaf3ef;
  --muted: #9db3ac;
  --green: #4cc27a;
  --green-dim: #2e7d46;
  --amber: #e0a13c;
  --red: #e0614e;
  --gap: #6b7f79;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --mono: ui-monospace, "Cascadia Mono", "Courier New", monospace;
  --sans: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1100px 600px at 80% -10%, #17332d 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 110%, #16302b 0%, transparent 55%),
    var(--bg);
  line-height: 1.5;
}

a { color: var(--green); }

.wrap { max-width: 1180px; margin: 0 auto; padding: 22px 20px 60px; }

/* header */
header.top {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; margin-bottom: 18px;
}
.brand h1 { margin: 0; font-size: 26px; letter-spacing: 0.2px; }
.brand .team { margin: 3px 0 0; color: var(--muted); font-size: 13.5px; }
.brand .badge {
  display: inline-block; margin-top: 8px; padding: 3px 9px; border-radius: 999px;
  background: #16302b; border: 1px solid var(--line); color: var(--muted); font-size: 12px;
}
.writeup-btn {
  display: inline-flex; align-items: center; gap: 9px; text-decoration: none;
  background: linear-gradient(180deg, #34a765, #268049);
  color: #05130d; font-weight: 700; font-size: 15px;
  padding: 12px 18px; border-radius: 12px; border: 1px solid #3fbf76;
  box-shadow: var(--shadow); white-space: nowrap;
}
.writeup-btn:hover { filter: brightness(1.06); }
.writeup-btn .arrow { font-size: 18px; }

/* layout */
.grid { display: grid; grid-template-columns: 380px 1fr; gap: 18px; align-items: start; }
@media (max-width: 900px) { .grid { grid-template-columns: 1fr; } }

.panel {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 18px; box-shadow: var(--shadow);
}
.panel h2 { margin: 0 0 12px; font-size: 15px; color: var(--muted); font-weight: 600;
  text-transform: uppercase; letter-spacing: 1.4px; }

label.field { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 5px; }
select, textarea, input[type="text"] {
  width: 100%; background: #0f201d; color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px; padding: 9px 11px;
  font-family: var(--sans); font-size: 14px;
}
textarea { font-family: var(--mono); font-size: 12.5px; resize: vertical; min-height: 62px; }
select:focus, textarea:focus { outline: 2px solid var(--green-dim); border-color: var(--green-dim); }

.seg { display: inline-flex; background: #0f201d; border: 1px solid var(--line);
  border-radius: 10px; padding: 3px; gap: 3px; flex-wrap: wrap; }
.seg button {
  border: 0; background: transparent; color: var(--muted);
  padding: 7px 12px; border-radius: 8px; cursor: pointer; font-size: 13px; font-family: var(--sans);
}
.seg button.on { background: var(--green-dim); color: #eafff1; font-weight: 600; }

.slider-row { margin: 14px 0; }
.slider-row .top { display: flex; justify-content: space-between; font-size: 13px; }
.slider-row .top b { color: var(--green); font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: var(--green); margin-top: 4px; }
.slider-row.dim { opacity: 0.4; pointer-events: none; }

.presets { display: flex; gap: 8px; margin-top: 6px; flex-wrap: wrap; }
.presets button {
  flex: 1; cursor: pointer; border-radius: 10px; padding: 9px; font-size: 13px; font-weight: 600;
  border: 1px solid var(--line); background: #0f201d; color: var(--ink);
}
.presets button.good { border-color: #2e7d46; }
.presets button.bad { border-color: #7a352c; }
.presets button:hover { filter: brightness(1.12); }

/* results */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 14px; }
.stat { background: #0f201d; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.stat .n { font-size: 30px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .l { font-size: 12px; color: var(--muted); }
.stat.green .n { color: var(--green); }
.stat.amber .n { color: var(--amber); }
.stat.red .n { color: var(--red); }

.used { font-size: 12.5px; color: var(--muted); margin: -4px 0 12px; }

.aln {
  font-family: var(--mono); font-size: 13px; line-height: 1.28;
  background: #0c1a17; border: 1px solid var(--line); border-radius: 12px;
  padding: 14px; overflow-x: auto; white-space: pre;
}
.aln .m { color: var(--green); }
.aln .x { color: var(--amber); }
.aln .g { color: var(--gap); }
.aln .bar { color: #40514b; }
.aln .lab { color: var(--muted); }

.legend { display: flex; gap: 16px; font-size: 12.5px; color: var(--muted); margin: 10px 2px 0; flex-wrap: wrap; }
.legend span b { font-family: var(--mono); }
.legend .m b { color: var(--green); } .legend .x b { color: var(--amber); } .legend .g b { color: var(--gap); }

.tools { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.tools button {
  cursor: pointer; border: 1px solid var(--line); background: #0f201d; color: var(--ink);
  border-radius: 10px; padding: 8px 12px; font-size: 13px;
}
.tools button:hover { filter: brightness(1.12); }

.plot-wrap { margin-top: 16px; }
canvas { width: 100%; max-width: 460px; background: #0c1a17; border: 1px solid var(--line); border-radius: 12px; display: block; }
.cap { font-size: 12px; color: var(--muted); margin-top: 6px; }

/* loading overlay */
.overlay {
  position: fixed; inset: 0; background: rgba(8, 16, 14, 0.92);
  display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 16px; z-index: 50;
  text-align: center; padding: 20px;
}
.overlay.hidden { display: none; }
.spinner {
  width: 44px; height: 44px; border-radius: 50%;
  border: 4px solid #24433c; border-top-color: var(--green); animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.overlay p { color: var(--muted); max-width: 420px; }
.overlay .big { color: var(--ink); font-size: 18px; font-weight: 600; }

.footnote { color: var(--muted); font-size: 12.5px; margin-top: 26px; text-align: center; }
.badge-live { color: var(--green); }

/* explore section */
.explore { margin-top: 18px; }
.explore-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 900px) { .explore-grid { grid-template-columns: 1fr; } }
.ex-card { background: #0f201d; border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.ex-card h3 { margin: 0 0 6px; font-size: 16px; color: var(--ink); }
.ex-card .cap { margin: 0 0 12px; }
.ex-btn {
  cursor: pointer; border: 1px solid #3fbf76; border-radius: 10px;
  background: linear-gradient(180deg, #2f9a5b, #23794533); color: #eafff1;
  font-weight: 600; font-size: 13.5px; padding: 9px 14px;
}
.ex-btn:hover { filter: brightness(1.1); }
.ex-btn:disabled { opacity: 0.55; cursor: default; filter: none; }
.ex-card canvas { width: 100%; max-width: 100%; height: auto; margin-top: 12px; }
#sigCap { color: var(--ink); font-size: 14px; }
#sigCap b { color: var(--green); }
#sigCap.no b { color: var(--amber); }

/* conservation strip */
.consv { width: 100%; height: 14px; margin-top: 10px; border-radius: 6px; display: block; border: 1px solid var(--line); }

/* fun preset + primary tool */
.presets button.fun { border-color: #7a5cc0; color: #d9ccff; }
.tools button.primary { border-color: var(--green); color: #d9ffe8; font-weight: 600; }

/* code inspect modal */
.modal {
  position: fixed; inset: 0; z-index: 100; padding: 22px;
  background: rgba(6, 12, 10, 0.72); backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center;
}
.modal.hidden { display: none; }
.modal-card {
  background: #0b1815; border: 1px solid var(--line); border-radius: 16px;
  width: min(880px, 96vw); max-height: 88vh; display: flex; flex-direction: column;
  overflow: hidden; box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
}
.modal-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px;
  padding: 15px 18px; border-bottom: 1px solid var(--line); }
.modal-head h3 { margin: 0; font-size: 17px; color: var(--ink); }
.modal-head .cap { margin: 4px 0 0; }
.modal-actions { display: flex; gap: 8px; flex-shrink: 0; }
.ex-btn.ghost { background: transparent; border-color: var(--line); color: var(--muted); }
.code-view { overflow: auto; padding: 10px 0 14px; background: #0b1815; }
.code-view .cl { display: flex; padding: 0 14px; white-space: pre; font-family: var(--mono); font-size: 12px; line-height: 1.55; }
.code-view .cl .ln { flex: 0 0 40px; width: 40px; text-align: right; padding-right: 12px; color: #3a4c46; user-select: none; }
.code-view .cl code { color: #6f847d; }
.code-view .cl.hot { background: rgba(76, 194, 122, 0.10); }
.code-view .cl.hot code { color: #dbe7e2; }
.code-view .cl.active { background: rgba(76, 194, 122, 0.4); }
.code-view .cl.active code { color: #ffffff; }
.code-view .cl.active .ln { color: #cfe0da; }