:root {
    --bg-0: #0b1020;
    --bg-1: #111733;
    --bg-2: #1a2148;
    --surface: rgba(255, 255, 255, 0.04);
    --surface-strong: rgba(255, 255, 255, 0.07);
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --text: #e8ecf6;
    --text-dim: #aab2c5;
    --muted: #7c8499;
    --accent: #5b8cff;
    --accent-2: #8b6cff;
    --green: #34d399;
    --red: #f87171;
    --yellow: #fbbf24;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: radial-gradient(1200px 800px at 0% -10%, #1a234d 0%, transparent 60%),
                radial-gradient(1000px 700px at 110% 10%, #2a1c5a 0%, transparent 55%),
                linear-gradient(180deg, var(--bg-0) 0%, #0a0f1f 100%);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 32px;
    border-bottom: 1px solid var(--border);
    background: rgba(11, 16, 32, 0.6);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}
.brand img { height: 32px; display: block; }
.topnav {
    display: flex;
    align-items: center;
    gap: 10px;
}
.nav-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-decoration: none;
    transition: all 120ms ease;
}
.nav-btn:hover {
    border-color: var(--border-strong);
    background: rgba(255,255,255,0.08);
    text-decoration: none;
    transform: translateY(-1px);
}
.nav-btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    border: none;
    color: white;
    box-shadow: 0 6px 16px rgba(91,140,255,0.25);
}
.nav-btn-primary:hover {
    box-shadow: 0 10px 22px rgba(91,140,255,0.4);
}

@media (max-width: 520px) {
    .topbar { padding: 12px 14px; }
    .nav-btn { padding: 7px 10px; font-size: 12px; }
    .nav-btn-primary span.long { display: none; }
}

.page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 28px 24px 80px;
}

.hero {
    text-align: center;
    padding: 36px 8px 28px;
}
.hero h1 {
    font-size: clamp(28px, 4vw, 44px);
    margin: 0 0 12px;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #b8c5ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero p {
    color: var(--text-dim);
    margin: 0 auto;
    max-width: 640px;
    font-size: 15px;
    line-height: 1.6;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 22px 24px;
    margin-bottom: 18px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(8px);
}

.card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}
.card-head h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.01em;
}
.card-head .muted {
    color: var(--muted);
    font-size: 13px;
    margin: 4px 0 0;
}

.legs-table-wrap {
    overflow-x: auto;
    border-radius: 10px;
    border: 1px solid var(--border);
}
.legs-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.legs-table thead th {
    text-align: left;
    padding: 12px 14px;
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
}
.legs-table tbody td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.legs-table tbody tr:last-child td { border-bottom: none; }

.legs-table input,
.legs-table select,
.grid-inputs input {
    width: 100%;
    padding: 9px 10px;
    background: rgba(0, 0, 0, 0.25);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    font: inherit;
    font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 13px;
    transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
}
.legs-table select { font-family: inherit; font-size: 13px; }
.legs-table input:focus,
.legs-table select:focus,
.grid-inputs input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.18);
    background: rgba(0, 0, 0, 0.35);
}

/* Segmented toggle buttons (Side, Instrument) */
.seg {
    display: inline-flex;
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2px;
    gap: 2px;
    overflow: hidden;
}
.seg-btn {
    appearance: none;
    -webkit-appearance: none;
    border: none;
    background: transparent;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 6px 11px;
    border-radius: 6px;
    cursor: pointer;
    min-width: 30px;
    transition: all 140ms cubic-bezier(.2,.8,.2,1);
    line-height: 1;
}
.seg-btn:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.seg-btn[aria-pressed="true"] {
    color: #0b1020;
    box-shadow: 0 4px 14px rgba(0,0,0,0.35), inset 0 0 0 1px rgba(255,255,255,0.18);
    transform: translateY(-1px);
}

/* Side: Buy = green, Sell = red */
.seg-btn.side-buy[aria-pressed="true"]  { background: linear-gradient(135deg, #4ade80, #22c55e); color: #06210d; }
.seg-btn.side-sell[aria-pressed="true"] { background: linear-gradient(135deg, #fb7185, #ef4444); color: #2a0606; }

/* Instrument: Call = orange, Put = green, Stock = yellow */
.seg-btn.inst-call[aria-pressed="true"]  { background: linear-gradient(135deg, #fb923c, #f97316); color: #2a1304; }
.seg-btn.inst-put[aria-pressed="true"]   { background: linear-gradient(135deg, #34d399, #10b981); color: #052016; }
.seg-btn.inst-stock[aria-pressed="true"] { background: linear-gradient(135deg, #fde047, #fbbf24); color: #2a1f04; }

.seg-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.row-delete {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-dim);
    width: 30px;
    height: 30px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 120ms ease;
}
.row-delete:hover {
    background: rgba(248, 113, 113, 0.12);
    border-color: rgba(248, 113, 113, 0.4);
    color: var(--red);
}

.legs-table .strike-cell.is-hidden,
.legs-table .premium-cell.is-hidden {
    opacity: 0.35;
}
.legs-table .strike-cell.is-hidden input,
.legs-table .premium-cell.is-hidden input {
    pointer-events: none;
    background: rgba(255, 255, 255, 0.02);
}

.grid-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
}
.grid-inputs label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-weight: 600;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-top: 18px;
}

.btn {
    border: 1px solid var(--border);
    background: var(--surface-strong);
    color: var(--text);
    padding: 10px 18px;
    border-radius: 10px;
    font: inherit;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 120ms ease;
}
.btn:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    border: none;
    color: white;
    padding: 11px 22px;
    box-shadow: 0 8px 22px rgba(91, 140, 255, 0.35);
}
.btn-primary:hover {
    box-shadow: 0 12px 28px rgba(91, 140, 255, 0.45);
}

.btn-secondary {
    background: rgba(91, 140, 255, 0.12);
    border-color: rgba(91, 140, 255, 0.35);
    color: #c8d6ff;
}
.btn-secondary:hover {
    background: rgba(91, 140, 255, 0.2);
}

.btn-ghost { background: transparent; }
.plus { font-size: 16px; line-height: 1; opacity: 0.8; }

.save-msg {
    margin-left: auto;
    font-size: 13px;
    color: var(--text-dim);
    word-break: break-all;
}
.save-msg.success { color: var(--green); }
.save-msg.failure { color: var(--red); }
.save-msg a { color: inherit; text-decoration: underline; }

.chart-card .card-head { align-items: center; }
.kpis {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}
.kpi {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 14px;
    min-width: 110px;
}
.kpi-label {
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 600;
}
.kpi-value {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 16px;
    font-weight: 600;
    margin-top: 2px;
}
.kpi.green .kpi-value { color: var(--green); }
.kpi.red .kpi-value { color: var(--red); }
.kpi.yellow .kpi-value { color: var(--yellow); }

.chart {
    width: 100%;
    height: 420px;
    background: rgba(0, 0, 0, 0.18);
    border-radius: 10px;
    border: 1px solid var(--border);
    padding: 8px;
}

.page-footer {
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    margin-top: 36px;
}

.hidden { display: none !important; }

@media (max-width: 720px) {
    .topbar { padding: 14px 16px; }
    .page { padding: 16px 12px 60px; }
    .card { padding: 16px; }
    .card-head { flex-direction: column; align-items: stretch; }
    .kpis { gap: 8px; }
    .kpi { flex: 1 1 calc(50% - 4px); min-width: 0; }

    .legs-table-wrap { border: none; }
    .legs-table thead { display: none; }
    .legs-table, .legs-table tbody, .legs-table tr, .legs-table td {
        display: block;
        width: 100%;
    }
    .legs-table tr {
        background: rgba(0, 0, 0, 0.22);
        border: 1px solid var(--border);
        border-radius: 10px;
        margin-bottom: 10px;
        padding: 8px 10px;
    }
    .legs-table td {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding: 6px 4px;
        border-bottom: none;
    }
    .legs-table td::before {
        content: attr(data-label);
        font-size: 11px;
        color: var(--muted);
        text-transform: uppercase;
        letter-spacing: 0.06em;
        font-weight: 600;
        flex-shrink: 0;
    }
    .legs-table input, .legs-table select { max-width: 60%; }
    .row-delete { margin-left: auto; }
    .chart { height: 320px; }
}