:root {
  --bg: #070b16;
  --panel: rgba(16, 24, 48, 0.72);
  --panel-solid: #101830;
  --line: rgba(120, 160, 255, 0.18);
  --text: #e8eeff;
  --muted: #9aabd0;
  --accent: #6ea8ff;
  --accent-2: #a78bfa;
  --good: #34d399;
  --warn: #fbbf24;
  --radius: 18px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.bg-layer {
  position: fixed; inset: 0; z-index: -1; overflow: hidden;
  pointer-events: none;
}
.bg-img {
  width: 100%; height: 100%; object-fit: cover; opacity: 0.35;
  filter: saturate(1.15) contrast(1.05);
}
.bg-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(110, 168, 255, 0.35), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(167, 139, 250, 0.28), transparent 50%),
    linear-gradient(180deg, rgba(7, 11, 22, 0.55), rgba(7, 11, 22, 0.92) 55%, #070b16);
}
.bg-noise {
  position: absolute; inset: 0; opacity: 0.06;
  background-image: url("assets/noise.svg");
  background-size: 180px;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 14px 18px; max-width: 1100px; margin: 0 auto;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); font-weight: 600; letter-spacing: -0.02em;
}
.brand img { border-radius: 8px; }
.pill {
  font-size: 12px; font-weight: 600; color: #c7d7ff;
  background: rgba(110, 168, 255, 0.14);
  border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 12px;
}

.wrap {
  width: min(1100px, calc(100% - 28px));
  margin: 0 auto 48px;
  display: grid; gap: 18px;
}

.hero {
  display: grid; gap: 20px; align-items: center;
  padding: 8px 0 4px;
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-2);
  font-size: 13px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 5vw, 2.6rem);
  line-height: 1.12; letter-spacing: -0.03em;
}
.lede { margin: 0; color: var(--muted); font-size: 1.02rem; max-width: 54ch; }
.hero-art {
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--panel-solid);
}
.hero-art img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }

.panel {
  background: var(--panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.panel-head { margin-bottom: 14px; }
.panel-head.row { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.panel-head h2, .tips h2 {
  margin: 0 0 6px; font-size: 1.15rem; letter-spacing: -0.02em;
}
.panel-head p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.panel-deco { opacity: 0.9; flex-shrink: 0; }

.presets {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px;
}
.preset, .seg-btn {
  appearance: none; border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  color: var(--text); font: inherit; font-size: 0.88rem; font-weight: 600;
  border-radius: 999px; padding: 8px 14px; cursor: pointer;
  transition: background .15s, border-color .15s, transform .12s;
}
.preset:hover, .seg-btn:hover { border-color: rgba(110,168,255,.45); }
.preset.active, .seg-btn.active {
  background: linear-gradient(135deg, rgba(110,168,255,.35), rgba(167,139,250,.28));
  border-color: rgba(167,139,250,.55);
}
.preset:active, .seg-btn:active { transform: scale(0.98); }

.grid-form {
  display: grid; gap: 12px;
  grid-template-columns: 1fr;
}
.field {
  display: grid; gap: 6px;
  font-size: 0.86rem; font-weight: 600; color: #c9d6f5;
}
.field input[type="number"],
.field input[type="range"] {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--text);
  background: rgba(0,0,0,0.28);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
}
.field input[type="range"] {
  padding: 10px 0; accent-color: var(--accent);
  background: transparent; border: none;
}
.field input:focus {
  outline: 2px solid rgba(110,168,255,.55);
  outline-offset: 1px;
}
.hint { color: var(--muted); font-weight: 500; font-size: 0.78rem; }
.seg { display: flex; gap: 8px; flex-wrap: wrap; }

.results {
  display: grid; gap: 12px;
  grid-template-columns: 1fr;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.card.highlight {
  background: linear-gradient(145deg, rgba(110,168,255,.18), rgba(167,139,250,.12) 50%, rgba(16,24,48,.8));
  border-color: rgba(110,168,255,.35);
}
.card-icon { margin-bottom: 8px; }
.card-label { margin: 0; color: var(--muted); font-size: 0.82rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.card-value {
  margin: 4px 0 2px;
  font-family: var(--mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600; letter-spacing: -0.03em;
}
.card-value.save { color: var(--good); }
.card-sub { margin: 0; color: var(--muted); font-size: 0.85rem; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 -4px; }
table {
  width: 100%; border-collapse: collapse; min-width: 560px;
  font-size: 0.9rem;
}
th, td {
  text-align: left; padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
td.mono, .mono { font-family: var(--mono); font-size: 0.85rem; }
tr.featured td { background: rgba(110,168,255,0.08); }
.badge {
  display: inline-block; font-size: 0.7rem; font-weight: 700;
  padding: 2px 8px; border-radius: 999px; margin-left: 6px;
  background: rgba(52,211,153,.15); color: var(--good); vertical-align: middle;
}
.diff-pos { color: var(--good); }
.diff-neg { color: #f87171; }
.diff-zero { color: var(--muted); }
.footnote { margin: 12px 0 0; color: var(--muted); font-size: 0.78rem; }

.tip-list { margin: 0; padding-left: 1.15rem; color: var(--muted); }
.tip-list li { margin-bottom: 10px; }
.tip-list strong { color: var(--text); }

.site-foot {
  text-align: center; color: var(--muted); font-size: 0.88rem;
  padding: 8px 0 24px;
}
.site-foot .tiny { font-size: 0.75rem; opacity: 0.85; }

@media (min-width: 720px) {
  .topbar, .wrap { width: min(1100px, calc(100% - 48px)); }
  .hero { grid-template-columns: 1.15fr 0.85fr; gap: 28px; padding-top: 18px; }
  .grid-form { grid-template-columns: 1fr 1fr; }
  .results { grid-template-columns: 1.2fr 1fr 1fr 1fr; }
  .panel { padding: 22px; }
}

@media (min-width: 980px) {
  .results { grid-template-columns: 1.35fr repeat(3, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; }
}