:root {
  --bg: #0e1420;
  --bg-2: #131b2b;
  --bg-3: #1a2438;
  --border: #26334d;
  --text: #e8edf5;
  --text-dim: #8fa0bd;
  --accent: #4f8cff;
  --accent-2: #2dd4bf;
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #eab308;
  --radius: 8px;
  --mono: 'SF Mono', 'Cascadia Code', Consolas, 'Roboto Mono', monospace;
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

#app { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }

/* Top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}
.brand { display: flex; align-items: center; gap: 8px; }
.logo { font-size: 22px; }
.brand-name { font-weight: 700; font-size: 17px; letter-spacing: 0.2px; }
.brand-clone { color: var(--accent); font-weight: 600; margin-left: 4px; font-size: 12px; vertical-align: middle; background: rgba(79,140,255,.15); padding: 2px 6px; border-radius: 10px; }

.topnav { display: flex; gap: 4px; }
.topnav a {
  color: var(--text-dim); text-decoration: none; padding: 7px 14px;
  border-radius: 6px; font-weight: 500; font-size: 14px;
}
.topnav a:hover { color: var(--text); background: var(--bg-3); }
.topnav a.active { color: var(--text); background: var(--bg-3); }

.topbar-right { display: flex; align-items: center; gap: 8px; }
.data-status { color: var(--text-dim); font-size: 12px; }

.btn {
  border: 1px solid var(--border); background: var(--bg-3); color: var(--text);
  padding: 8px 16px; border-radius: 6px; cursor: pointer; font-size: 14px; font-weight: 500;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: #22304a; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: #3f7bee; }
.btn-ghost { background: transparent; }
.btn-sm { padding: 5px 10px; font-size: 13px; }

/* Layout */
.layout { display: flex; flex: 1 1 auto; min-height: 0; }

/* Sidebar */
.sidebar {
  width: 230px; flex: 0 0 230px;
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.sidebar-search { padding: 10px; border-bottom: 1px solid var(--border); }
.sidebar-search input {
  width: 100%; padding: 8px 10px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  font-size: 13px; outline: none;
}
.sidebar-search input:focus { border-color: var(--accent); }

.strategy-list { flex: 1 1 auto; overflow-y: auto; padding: 8px 0; }
.strategy-cat {
  padding: 8px 14px 4px; color: var(--text-dim); font-size: 11px;
  font-weight: 700; text-transform: uppercase; letter-spacing: .8px;
}
.strategy-item {
  display: block; width: 100%; text-align: left;
  padding: 8px 14px; color: var(--text); background: transparent;
  border: none; border-left: 3px solid transparent; cursor: pointer;
  font-size: 13.5px; transition: background .12s;
}
.strategy-item:hover { background: var(--bg-3); }
.strategy-item.active {
  background: var(--bg-3); border-left-color: var(--accent); color: #fff;
  font-weight: 600;
}

/* Main */
.main { flex: 1 1 auto; display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.symbol-bar { padding: 12px 16px 8px; border-bottom: 1px solid var(--border); flex: 0 0 auto; }

.symbol-form { display: flex; gap: 8px; margin-bottom: 10px; }
.symbol-form input {
  flex: 1; padding: 10px 14px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  font-size: 15px; outline: none; text-transform: uppercase;
}
.symbol-form input:focus { border-color: var(--accent); }

.quote-info { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.quote-symbol { font-size: 22px; font-weight: 800; }
.quote-name { color: var(--text-dim); font-size: 13px; }
.quote-price { font-size: 20px; font-weight: 700; font-family: var(--mono); }
.quote-change { font-size: 14px; font-weight: 600; font-family: var(--mono); }
.quote-change.up { color: var(--green); }
.quote-change.down { color: var(--red); }

.expiry-tabs { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; }
.expiry-tab {
  padding: 6px 12px; border-radius: 6px; background: var(--bg-3);
  border: 1px solid var(--border); color: var(--text-dim); cursor: pointer;
  font-size: 12.5px; white-space: nowrap; transition: all .12s;
}
.expiry-tab:hover { color: var(--text); }
.expiry-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.chain-section { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; }
.chain-header {
  display: grid; grid-template-columns: 1fr 90px 1fr;
  padding: 8px 12px; background: var(--bg-3); border-bottom: 1px solid var(--border);
  font-size: 12px; font-weight: 700; text-transform: uppercase; color: var(--text-dim);
}
.chain-col { text-align: center; }
.chain-col.call-col { text-align: left; padding-left: 12px; }
.chain-col.put-col { text-align: right; padding-right: 12px; }

.chain-scroll { flex: 1 1 auto; overflow-y: auto; }

.chain-row {
  display: grid; grid-template-columns: 1fr 90px 1fr;
  padding: 5px 8px; border-bottom: 1px solid rgba(38,51,77,.4); cursor: pointer;
  transition: background .1s; align-items: center;
}
.chain-row:hover { background: var(--bg-3); }
.chain-row.selected { background: rgba(79,140,255,.12); }
.chain-row.selected-call { background: rgba(34,197,94,.10); }
.chain-row.selected-put { background: rgba(239,68,68,.10); }
.chain-row.selected-call.selected-put { background: rgba(234,179,8,.10); }

.cell { display: flex; gap: 8px; align-items: center; font-family: var(--mono); font-size: 12.5px; }
.cell-call { justify-content: flex-start; }
.cell-put { justify-content: flex-end; }
.cell-strike { justify-content: center; font-weight: 700; color: var(--text); }
.cell-val { min-width: 48px; text-align: right; }
.cell-val.dim { color: var(--text-dim); }
.cell-label { color: var(--text-dim); font-size: 10px; min-width: 22px; }
.price-green { color: var(--green); }
.price-red { color: var(--red); }
.badge { font-size: 9px; padding: 1px 4px; border-radius: 4px; background: rgba(255,255,255,.08); }

/* Builder (right panel) */
.builder {
  width: 420px; flex: 0 0 420px;
  background: var(--bg-2);
  border-left: 1px solid var(--border);
  overflow-y: auto; padding: 14px;
}
.builder-header { margin-bottom: 10px; }
.builder-header h2 { font-size: 18px; margin-bottom: 2px; }
.strategy-desc { color: var(--text-dim); font-size: 12.5px; display: block; margin-bottom: 8px; }
.builder-actions { display: flex; gap: 6px; margin-top: 8px; }

.legs-panel { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.leg-row {
  display: grid; grid-template-columns: 42px 1fr 120px auto;
  gap: 8px; align-items: center;
  padding: 8px 10px; border-radius: var(--radius);
  background: var(--bg-3); border: 1px solid var(--border);
}
.leg-action { font-weight: 700; font-size: 13px; }
.leg-action.buy { color: var(--green); }
.leg-action.sell { color: var(--red); }
.leg-detail { font-size: 12.5px; font-family: var(--mono); }
.leg-cost { text-align: right; font-family: var(--mono); font-size: 12.5px; }
.leg-remove { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 15px; }
.leg-remove:hover { color: var(--red); }
.leg-edit { background: none; border: 1px solid var(--border); color: var(--text); border-radius: 4px; cursor: pointer; font-size: 11px; padding: 1px 5px; }
.leg-edit:hover { border-color: var(--accent); }

.date-slider-panel { margin-bottom: 12px; }
.date-slider-panel label { font-size: 12px; color: var(--text-dim); display: block; margin-bottom: 4px; }
.date-slider-panel input[type=range] { width: 100%; accent-color: var(--accent); }
.date-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-dim); }

.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 12px; }
.stat-card { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 10px; }
.stat-label { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .5px; }
.stat-value { font-size: 15px; font-weight: 700; font-family: var(--mono); margin-top: 2px; }
.stat-value.green { color: var(--green); }
.stat-value.red { color: var(--red); }

.greeks-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: 12px; }
.greek { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius); padding: 6px 8px; text-align: center; }
.greek-label { display: block; font-size: 10px; color: var(--text-dim); }
.greek span:last-child { font-family: var(--mono); font-size: 12.5px; font-weight: 600; }

.chart-panel { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px; margin-bottom: 12px; }
.chart-panel canvas { width: 100%; height: 240px; }

.prob-panel { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; }
.prob-bar { height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; margin-bottom: 6px; }
.prob-fill { height: 100%; background: linear-gradient(90deg, var(--red), var(--yellow), var(--green)); border-radius: 4px; transition: width .3s; }
.prob-labels { font-size: 12.5px; color: var(--text-dim); }

/* Saved view */
.saved-view { flex: 1 1 auto; overflow-y: auto; padding: 20px; }
.saved-view h2 { margin-bottom: 16px; }
.saved-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.saved-card {
  background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; cursor: pointer; transition: border-color .15s, transform .1s;
}
.saved-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.saved-card h3 { font-size: 15px; margin-bottom: 4px; }
.saved-card .saved-meta { color: var(--text-dim); font-size: 12px; margin-bottom: 6px; }
.saved-card .saved-tags { display: flex; gap: 4px; flex-wrap: wrap; }
.saved-card .tag { font-size: 10.5px; background: rgba(79,140,255,.15); color: var(--accent); padding: 2px 6px; border-radius: 8px; }
.saved-actions { display: flex; gap: 6px; margin-top: 10px; }
.saved-actions .btn { font-size: 12px; padding: 4px 10px; }
.empty-state { color: var(--text-dim); text-align: center; padding: 60px 20px; }
.empty-state .big { font-size: 40px; margin-bottom: 10px; }

/* Toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: #1f2937; border: 1px solid var(--border); color: var(--text);
  padding: 10px 20px; border-radius: 8px; font-size: 14px; z-index: 1000;
  box-shadow: 0 8px 24px rgba(0,0,0,.4); opacity: 0; transition: opacity .2s;
  pointer-events: none;
}
.toast.show { opacity: 1; }

/* Scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #2c3a55; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3a4a6b; }

@media (max-width: 1200px) {
  .builder { width: 360px; flex-basis: 360px; }
}
@media (max-width: 960px) {
  .sidebar { width: 180px; flex-basis: 180px; }
  .builder { width: 100%; flex-basis: 100%; }
  .layout { flex-direction: column; }
  .main { min-height: 50vh; }
}