:root {
  --bg: #0B0E14;
  --panel: #131825;
  --panel-2: #1A2030;
  --border: #2A3142;
  --border-soft: #1C2230;
  --text: #E8ECF4;
  --text-2: #C5CCDA;
  --muted: #8A94A8;
  --dim: #4A5468;
  --pos: #22C55E;
  --pos-dim: #16A34A;
  --neg: #EF4444;
  --neg-dim: #DC2626;
  --spot: #FACC15;
  --accent: #3B82F6;
  --radius: 8px;
  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.mono { font-family: var(--font-mono); }
.pos { color: var(--pos); }
.neg { color: var(--neg); }
.spot-c { color: var(--spot); }
.muted { color: var(--muted); }

/* ---------- Header ---------- */
.site-header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(11, 14, 20, 0.92);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(6px);
}

.logo {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.logo em { color: var(--pos); font-style: normal; }

.tool-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-left: 8px;
}
.tool-toggle a {
  padding: 7px 16px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s, background .15s;
  white-space: nowrap;
}
.tool-toggle a:hover { color: var(--text-2); }
.tool-toggle a.active {
  background: #1D2B3F;
  color: var(--text);
}

.header-right { margin-left: auto; font-size: 12px; color: var(--dim); }

/* ---------- Layout ---------- */
.page { flex: 1; width: 100%; max-width: 1240px; margin: 0 auto; padding: 24px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 16px;
  position: relative;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}

/* ---------- Controls ---------- */
.input, select.input {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 8px 12px;
  outline: none;
  min-width: 0;
}
.input:focus { border-color: var(--accent); }
.input::placeholder { color: var(--dim); font-family: var(--font-ui); }

.btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-2);
  font-family: var(--font-ui);
  font-size: 13px;
  padding: 8px 14px;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn:hover { border-color: var(--accent); color: var(--text); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:disabled { opacity: .45; cursor: default; }

.seg {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.seg button {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 13px;
  font-family: var(--font-ui);
  padding: 8px 14px;
  cursor: pointer;
}
.seg button.active { background: #1D2B3F; color: var(--text); }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 14px;
  cursor: pointer;
  transition: all .15s;
  user-select: none;
}
.chip:hover { border-color: var(--accent); }
.chip.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--accent);
  color: var(--text);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.35);
  cursor: grab;
  transition: box-shadow .15s, transform .1s;
}
input[type="range"]::-webkit-slider-thumb:hover { box-shadow: 0 0 0 5px rgba(59, 130, 246, 0.18); }
input[type="range"]:active::-webkit-slider-thumb { cursor: grabbing; transform: scale(1.1); }
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: grab;
  transition: box-shadow .15s;
}
input[type="range"]::-moz-range-thumb:hover { box-shadow: 0 0 0 5px rgba(59, 130, 246, 0.18); }

/* ---------- Stats bar ---------- */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 12px;
  color: var(--muted);
  align-items: baseline;
}
.stats .v { font-family: var(--font-mono); font-size: 14px; color: var(--text); }

/* ---------- Tables ---------- */
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th {
  text-align: right;
  font-weight: 500;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border-soft);
}
.tbl td {
  text-align: right;
  font-family: var(--font-mono);
  padding: 6px 8px;
  border-bottom: 1px solid var(--border-soft);
}
.tbl th:first-child, .tbl td:first-child { text-align: left; }

/* ---------- Landing ---------- */
.hero { text-align: center; padding: 64px 16px 48px; }
.hero h1 { font-size: 40px; font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
.hero h1 em { color: var(--pos); font-style: normal; }
.hero p { color: var(--muted); max-width: 560px; margin: 16px auto 28px; font-size: 16px; }

.tool-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
.tool-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .2s, transform .2s;
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-card h2 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.tool-card p { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.tool-card .cta { color: var(--accent); font-size: 13px; }
.tool-card svg { width: 100%; height: 110px; margin-bottom: 14px; }

.explainer { max-width: 720px; margin: 64px auto 0; }
.explainer h2 { font-size: 22px; margin-bottom: 12px; }
.explainer h3 { font-size: 16px; margin: 24px 0 8px; }
.explainer p { color: var(--text-2); font-size: 14px; margin-bottom: 12px; }

/* ---------- Pricer layout ---------- */
.pricer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  align-items: start;
}

.leg-row {
  display: grid;
  grid-template-columns: 64px 64px 1fr 1fr 56px 28px;
  gap: 6px;
  margin-bottom: 8px;
}
.leg-row .input, .leg-row select { font-size: 12px; padding: 6px 8px; }
.leg-remove {
  background: none; border: none; color: var(--dim);
  cursor: pointer; font-size: 16px; line-height: 1;
}
.leg-remove:hover { color: var(--neg); }

.greeks-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.greek {
  background: var(--panel-2);
  border-radius: var(--radius);
  padding: 8px 10px;
  text-align: center;
}
.greek .l { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.greek .n { font-family: var(--font-mono); font-size: 14px; }

.result-big { font-family: var(--font-mono); font-size: 26px; font-weight: 600; }

/* ---------- Charts ---------- */
.chart { width: 100%; border-radius: 6px; cursor: crosshair; }
#gexChart { height: 600px; }
#priceChart { height: 380px; }
#plChart { height: 240px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 20px 24px;
  font-size: 12px;
  color: var(--dim);
  text-align: center;
}
.site-footer a { color: var(--muted); }

.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
  background: rgba(11, 14, 20, 0.72);
  backdrop-filter: blur(2px);
  border-radius: var(--radius);
  z-index: 5;
}
.loading-overlay::before {
  content: '';
  width: 30px;
  height: 30px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: sb-spin 0.7s linear infinite;
}
@keyframes sb-spin { to { transform: rotate(360deg); } }

.err {
  background: rgba(239, 68, 68, .08);
  border: 1px solid rgba(239, 68, 68, .35);
  color: #FCA5A5;
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 12px;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .pricer-grid { grid-template-columns: 1fr; }
  #gexChart { height: 480px; }
  .page { padding: 16px; }
  .hero h1 { font-size: 30px; }
}
@media (max-width: 560px) {
  .site-header { padding: 10px 12px; gap: 10px; }
  .header-right { display: none; }
  .tool-toggle a { padding: 7px 10px; font-size: 12px; }
  .leg-row { grid-template-columns: 56px 56px 1fr 1fr 44px 24px; }
  #gexChart { height: 420px; }
}