:root {
  --bg-0: #0b0e11;
  --bg-1: #11151a;
  --bg-2: #161b22;
  --bg-3: #1d232b;
  --border: #232a33;
  --text-0: #e6e9ec;
  --text-1: #8b96a3;
  --text-2: #586272;
  --accent: #3aa0ff;
  --buy: #19c37d;
  --sell: #f5455c;
  --warn: #e8a23d;
  --radius: 4px;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  --sans: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg-0); color: var(--text-0); font-family: var(--sans); font-size: 14px; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }

.topbar { display: flex; align-items: center; justify-content: space-between; padding: 10px 20px; background: var(--bg-1); border-bottom: 1px solid var(--border); }
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 18px; }
.brand { font-family: var(--mono); font-weight: 700; font-size: 15px; }
.brand-accent { color: var(--accent); }
.navlink { font-size: 13px; color: var(--text-1); }
.navlink:hover { color: var(--text-0); }
.navlink-muted { color: var(--text-2); }
.clock { font-family: var(--mono); color: var(--text-1); font-size: 13px; min-width: 72px; text-align: right; }

.status-pill { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; padding: 3px 8px; border-radius: 12px; border: 1px solid var(--border); }
.status-ok { color: var(--buy); border-color: rgba(25,195,125,0.35); background: rgba(25,195,125,0.08); }
.status-error { color: var(--sell); border-color: rgba(245,69,92,0.35); background: rgba(245,69,92,0.08); }
.status-unknown { color: var(--text-2); }

.flash-stack { padding: 10px 20px 0; }
.flash { padding: 8px 14px; border-radius: var(--radius); font-size: 13px; margin-bottom: 8px; }
.flash-error { background: rgba(245,69,92,0.12); color: var(--sell); border: 1px solid rgba(245,69,92,0.3); }
.flash-success { background: rgba(25,195,125,0.12); color: var(--buy); border: 1px solid rgba(25,195,125,0.3); }

.banner { margin: 16px 20px 0; padding: 10px 16px; border-radius: var(--radius); display: flex; align-items: center; gap: 12px; font-size: 13px; }
.banner-warning { background: rgba(232,162,61,0.1); border: 1px solid rgba(232,162,61,0.3); color: var(--warn); }

.app-main { padding: 16px 20px 40px; }

.grid-layout {
  display: grid;
  grid-template-columns: 1fr 1fr 320px;
  gap: 14px;
  grid-template-areas:
    "index   index   index"
    "chain   chain   ticket"
    "positions orders ticket";
}
.panel-index { grid-area: index; }
.panel-chain { grid-area: chain; }
.panel-ticket { grid-area: ticket; }
.panel-positions { grid-area: positions; }
.panel-orders { grid-area: orders; }

@media (max-width: 1100px) {
  .grid-layout { grid-template-columns: 1fr; grid-template-areas: "index" "ticket" "chain" "positions" "orders"; }
}

.panel { background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.panel-header { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.panel-header h2 { font-size: 13px; font-weight: 600; letter-spacing: 0.4px; text-transform: uppercase; color: var(--text-1); margin: 0; }

.index-row { display: flex; gap: 24px; padding: 14px 18px; flex-wrap: wrap; }
.index-tile { display: flex; flex-direction: column; gap: 2px; min-width: 100px; }
.index-label { font-size: 11px; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.5px; }
.index-value { font-family: var(--mono); font-size: 20px; font-weight: 600; }
.index-change { font-family: var(--mono); font-size: 12px; color: var(--text-1); }

.table-scroll { overflow-x: auto; max-height: 460px; overflow-y: auto; }
table { width: 100%; border-collapse: collapse; }
.chain-table, .data-table { font-family: var(--mono); font-size: 12.5px; }
.chain-table th, .data-table th { position: sticky; top: 0; background: var(--bg-2); color: var(--text-1); font-weight: 600; text-align: right; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.chain-table td, .data-table td { text-align: right; padding: 6px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.side-header { text-align: center !important; font-size: 11px; letter-spacing: 1px; }
.side-call { color: var(--buy); }
.side-put { color: var(--sell); }
.strike-header { text-align: center !important; background: var(--bg-3) !important; }
.strike-col { background: var(--bg-3); text-align: center !important; }
.sub-header th { font-size: 11px; padding: 6px 10px; }
.empty-row { text-align: center !important; color: var(--text-2); padding: 24px !important; font-family: var(--sans); }
.select-expiry { background: var(--bg-3); border: 1px solid var(--border); color: var(--text-0); padding: 4px 8px; border-radius: var(--radius); font-size: 12px; }

/* Option chain ATM and colour */
.atm-row td { background: rgba(58,160,255,0.07); }
.atm-row .strike-col { background: rgba(58,160,255,0.15) !important; font-weight: 700; color: var(--accent); }
.oi-call { color: var(--buy); }
.oi-put { color: var(--sell); }
.ltp-call { color: var(--buy); font-weight: 600; }
.ltp-put { color: var(--sell); font-weight: 600; }

.pnl-total { font-family: var(--mono); font-size: 13px; color: var(--text-1); }
.pnl-pos { color: var(--buy); }
.pnl-neg { color: var(--sell); }

/* Order ticket */
.order-form { padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.field-row { display: flex; flex-direction: column; gap: 4px; }
.field-row.two-col { flex-direction: row; gap: 10px; }
.field-row.two-col > * { flex: 1; }
label { font-size: 11px; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.4px; }
input, select { background: var(--bg-3); border: 1px solid var(--border); color: var(--text-0); padding: 8px 10px; border-radius: var(--radius); font-family: var(--mono); font-size: 13px; width: 100%; }
input:focus, select:focus { outline: none; border-color: var(--accent); }

.btn { border: 1px solid var(--border); background: var(--bg-3); color: var(--text-0); padding: 9px 14px; border-radius: var(--radius); font-size: 13px; font-weight: 600; cursor: pointer; transition: filter 0.1s; }
.btn:hover { filter: brightness(1.15); }
.btn-block { width: 100%; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #04111e; }
.btn-buy { background: rgba(25,195,125,0.12); border-color: var(--buy); color: var(--buy); }
.btn-sell { background: rgba(245,69,92,0.12); border-color: var(--sell); color: var(--sell); }
.btn-muted { background: transparent; color: var(--text-1); }
.btn-buy.active { background: var(--buy); color: #04140d; }
.btn-sell.active { background: var(--sell); color: #1a0306; }
.order-feedback { font-size: 12px; font-family: var(--mono); min-height: 16px; }
.order-feedback.error { color: var(--sell); }
.order-feedback.success { color: var(--buy); }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-overlay.hidden { display: none; }
.modal-card { background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; width: 360px; }
.modal-card h3 { margin: 0 0 12px; font-size: 15px; }
.confirm-details { font-family: var(--mono); font-size: 13px; color: var(--text-1); margin-bottom: 16px; line-height: 1.6; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* Login */
.login-screen { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-card { background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; width: 320px; }
.login-brand { font-family: var(--mono); font-weight: 700; font-size: 18px; margin-bottom: 4px; }
.login-sub { color: var(--text-1); font-size: 13px; margin: 0 0 20px; }
.login-form { display: flex; flex-direction: column; gap: 6px; }
.login-form label { margin-top: 8px; }

/* Settings */
.settings-page { display: flex; flex-direction: column; gap: 14px; max-width: 640px; }
.settings-row { display: flex; align-items: center; gap: 12px; padding: 12px 14px; flex-wrap: wrap; }
.hint-text { color: var(--text-2); font-size: 12px; padding: 0 14px 14px; margin: 0; line-height: 1.5; }
code { font-family: var(--mono); font-size: 11px; background: var(--bg-3); padding: 2px 6px; border-radius: 3px; }