/* DataDrivenTrader Tools — shared styles */
:root {
  --bg: #0a0d12;
  --bg-2: #0e131a;
  --surface: #121821;
  --surface-2: #171f2a;
  --border: #222c3a;
  --text: #e6edf3;
  --muted: #8b98a9;
  --blue: #4f9cf9;
  --blue-soft: rgba(79, 156, 249, 0.12);
  --green: #3fb950;
  --green-soft: rgba(63, 185, 80, 0.12);
  --red: #f85149;
  --red-soft: rgba(248, 81, 73, 0.12);
  --amber: #e3b341;
  --gold: #e3b341;
  --radius: 14px;
  --font: "Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 88px; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(79,156,249,0.14), transparent 60%),
    radial-gradient(700px 400px at -10% 110%, rgba(63,185,80,0.08), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(10, 13, 18, 0.85);
  backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: 0.02em; }
.brand:hover { text-decoration: none; }
.brand img { width: 34px; height: 34px; border-radius: 8px; }
.brand span b { color: var(--blue); font-weight: 700; }
.nav { display: flex; gap: 20px; font-size: 14px; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--text); text-decoration: none; }
@media (max-width: 640px) { .nav .hide-sm { display: none; } }

/* Typography */
.eyebrow {
  color: var(--blue); font-size: 13px; font-weight: 600;
  letter-spacing: 0.22em; text-transform: uppercase; margin: 0 0 10px;
}
h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.15; margin: 0 0 14px; font-weight: 700; letter-spacing: -0.01em; }
h1 .hl { color: var(--blue); }
h2 { font-size: clamp(22px, 3vw, 28px); line-height: 1.25; margin: 48px 0 14px; font-weight: 700; }
h3 { font-size: 18px; margin: 28px 0 8px; font-weight: 600; }
.lead { color: var(--muted); font-size: 18px; max-width: 680px; margin: 0; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); }

/* Hero */
.page-hero { padding: 48px 0 28px; }

/* Calculator card */
.calc {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } }
.calc-inputs { padding: 26px; border-right: 1px solid var(--border); }
@media (max-width: 860px) { .calc-inputs { border-right: 0; border-bottom: 1px solid var(--border); } }
.calc-results { padding: 26px; background: var(--bg-2); }
.calc-title { font-size: 13px; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin: 0 0 18px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; }
.field .hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 420px) { .row-2 { grid-template-columns: 1fr; } }

.input {
  display: flex; align-items: center;
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus-within { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.input .affix { padding: 0 12px; color: var(--muted); font-size: 14px; white-space: nowrap; }
.input input, .input select {
  flex: 1; min-width: 0; width: 100%;
  background: transparent; border: 0; outline: 0; color: var(--text);
  font: 500 16px var(--mono); padding: 11px 12px;
}
.input .affix + input { padding-left: 0; }
.input select { font-family: var(--font); cursor: pointer; }
.input select option { background: var(--surface); }

.seg { display: inline-flex; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 3px; }
.seg button {
  font: 500 14px var(--font); color: var(--muted); background: transparent;
  border: 0; border-radius: 7px; padding: 7px 14px; cursor: pointer;
}
.seg button[aria-pressed="true"] { background: var(--surface-2); color: var(--text); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 600 15px var(--font); border-radius: 10px; padding: 11px 18px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text); cursor: pointer;
}
.btn:hover { text-decoration: none; border-color: var(--blue); }
.btn-green { background: var(--green); border-color: var(--green); color: #07130a; }
.btn-green:hover { filter: brightness(1.08); border-color: var(--green); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 7px 12px; font-size: 13px; }

/* Results */
.result-main {
  border: 1px solid var(--border); border-radius: 12px; padding: 18px; margin-bottom: 14px;
  background: var(--surface);
}
.result-main .k { font-size: 12px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.result-main .v { font: 700 34px var(--mono); line-height: 1.2; margin-top: 4px; overflow-wrap: break-word; }
.result-main .sub { font-size: 14px; color: var(--muted); margin-top: 2px; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; background: var(--surface); }
.stat .k { font-size: 12px; color: var(--muted); }
.stat .v { font: 600 17px var(--mono); margin-top: 2px; overflow-wrap: break-word; }
.pos { color: var(--green) !important; }
.neg { color: var(--red) !important; }
.alert {
  border-radius: 10px; padding: 10px 14px; font-size: 14px; margin-top: 12px;
  border: 1px solid; display: none;
}
.alert.show { display: block; }
.alert.warn { color: var(--amber); border-color: rgba(227,179,65,.35); background: rgba(227,179,65,.08); }
.alert.err { color: var(--red); border-color: rgba(248,81,73,.35); background: var(--red-soft); }

/* Buys table (average price calc) */
.buys { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
.buys th { text-align: left; font-size: 12px; font-weight: 600; color: var(--muted); padding: 0 6px 6px 0; }
.buys td { padding: 0 6px 8px 0; vertical-align: middle; }
.buys td:last-child { width: 36px; padding-right: 0; }
.buys .input input { padding: 9px 10px; font-size: 15px; }
.icon-btn {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); cursor: pointer; font-size: 18px; line-height: 1;
}
.icon-btn:hover { color: var(--red); border-color: var(--red); }

/* Promo (Etsy template) */
.promo {
  margin: 36px 0 0; display: grid; grid-template-columns: 1.1fr 1fr; gap: 24px; align-items: center;
  border: 1px solid var(--border); border-radius: var(--radius); padding: 22px;
  background: linear-gradient(135deg, rgba(79,156,249,0.08), rgba(63,185,80,0.06)), var(--surface);
}
@media (max-width: 760px) { .promo { grid-template-columns: 1fr; } }
.promo h3 { margin: 4px 0 8px; font-size: 22px; }
.promo ul { margin: 0 0 16px; padding-left: 18px; color: var(--muted); }
.promo img { border-radius: 10px; border: 1px solid var(--border); }

/* Article content */
.content { padding-bottom: 20px; }
.content p, .content li { color: #c9d4df; }
.content ul, .content ol { padding-left: 22px; margin: 0 0 14px; }
.content li { margin-bottom: 6px; }
.formula {
  font: 500 15px var(--mono); background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid var(--blue); border-radius: 8px; padding: 14px 16px; margin: 0 0 16px;
  overflow-x: auto; white-space: pre; color: var(--text);
}
.example { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; margin-bottom: 16px; }
.example p:last-child { margin-bottom: 0; }
table.data { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 15px; }
table.data th, table.data td { border-bottom: 1px solid var(--border); padding: 9px 10px; text-align: left; }
table.data th { color: var(--muted); font-weight: 600; font-size: 13px; }
table.data td.num { font-family: var(--mono); }
.table-scroll { overflow-x: auto; }

details.faq { border: 1px solid var(--border); border-radius: 10px; background: var(--surface); margin-bottom: 10px; }
details.faq summary { cursor: pointer; padding: 14px 16px; font-weight: 600; list-style: none; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; float: right; color: var(--muted); }
details.faq[open] summary::after { content: "–"; }
details.faq div { padding: 0 16px 12px; }

/* Tool grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.card {
  display: block; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); padding: 20px; color: var(--text); transition: border-color .15s, transform .15s;
}
a.card:hover { border-color: var(--blue); text-decoration: none; transform: translateY(-2px); }
.card .tag { font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--green); }
.card h3 { margin: 6px 0 6px; }
.card p { color: var(--muted); font-size: 14px; margin: 0; }
.card.soon { opacity: .55; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 640px) { .grid-2 { grid-template-columns: 1fr; } }
.card.soon .tag { color: var(--muted); }

.related { margin-top: 12px; }

.disclaimer { font-size: 13px; color: var(--muted); border-top: 1px solid var(--border); padding-top: 16px; margin-top: 36px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 64px; padding: 28px 0 40px; font-size: 14px; color: var(--muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }

/* Free / paid badges */
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.badge { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; border-radius: 999px; padding: 3px 10px; border: 1px solid; white-space: nowrap; }
.badge-free { color: var(--green); border-color: rgba(63,185,80,.4); background: var(--green-soft); }
.badge-paid { color: var(--gold); border-color: rgba(227,179,65,.4); background: rgba(227,179,65,.1); }

/* Multi-coin average price calculator */
.calc-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.coin-box { border: 1px solid var(--border); border-radius: 12px; background: var(--surface-2); padding: 14px; margin-bottom: 14px; }
.coin-head { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.coin-name { flex: 1; max-width: 220px; }
.coin-name input { font-family: var(--font); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.coin-name input::placeholder { text-transform: none; letter-spacing: 0; font-weight: 400; color: var(--muted); }
.coin-head .rm-coin { margin-left: auto; color: var(--muted); }
.coin-head .rm-coin:hover { color: var(--red); border-color: var(--red); }
@media (min-width: 861px) { #calc #results { position: sticky; top: 84px; } }
.coin-box .buys { margin-bottom: 6px; }
.coin-foot { display: grid; grid-template-columns: auto 1fr; gap: 8px 12px; align-items: center; }
.coin-foot .add-buy { grid-column: 1 / -1; justify-self: start; }
.coin-foot .now-label { font-size: 14px; font-weight: 500; white-space: nowrap; }
@media (max-width: 420px) { .coin-foot { grid-template-columns: 1fr; } }
.coin-result { border: 1px solid var(--border); border-radius: 10px; background: var(--surface); padding: 12px 14px; margin-bottom: 10px; }
.coin-result-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.coin-tag { font-weight: 700; letter-spacing: .06em; color: var(--blue); }
.coin-result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 14px; }
.coin-result-grid .k { font-size: 12px; color: var(--muted); }
.coin-result-grid .v { font: 600 15px var(--mono); overflow-wrap: break-word; }

/* Price + percent pair (position size) */
.pair { display: grid; grid-template-columns: 1.3fr 1fr; gap: 10px; }
@media (max-width: 380px) { .pair { grid-template-columns: 1fr; } }

/* Mode switch (position size) */
.calc[hidden] { display: none; }
.mode-switch { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.seg-lg button { padding: 10px 18px; font-size: 15px; }
.mode-help { margin: 0; font-size: 14px; }
@media (max-width: 520px) { .seg-lg { display: flex; width: 100%; } .seg-lg button { flex: 1; padding: 10px 8px; font-size: 13px; } }
.result-main.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.result-main.split .v { font-size: 26px; }
@media (max-width: 420px) { .result-main.split { grid-template-columns: 1fr; } }

/* Plain-language answer under the main result */
.answer { margin: 12px 0 0; padding-top: 12px; border-top: 1px solid var(--border); font-size: 15px; line-height: 1.6; color: #c9d4df; }
.answer b { color: var(--text); font-weight: 600; }

/* Leverage comparison table */
.lev-table tr.current td { background: var(--blue-soft); color: var(--text); font-weight: 600; }
.lev-table tr.current td:first-child { box-shadow: inset 3px 0 0 var(--blue); }

/* Line chart (DCA) — value #30a14e, invested #3d8bfd dashed (validated pair, dark surface) */
.chart-card { margin-top: 28px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-2); padding: 20px; }
.chart-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.chart-head h2 { font-size: 20px; }
.legend { display: flex; gap: 16px; font-size: 13px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 8px; }
.key { display: inline-block; width: 16px; height: 0; border-top: 2px solid; vertical-align: middle; }
.key-val { border-color: #30a14e; }
.key-inv { border-color: #3d8bfd; border-top-style: dashed; }
.chart-area { position: relative; }
.chart-wrap svg { display: block; overflow: visible; }
.chart-wrap .grid { stroke: var(--border); stroke-width: 1; }
.chart-wrap .axis { fill: var(--muted); font: 500 11px var(--font); }
.chart-wrap .line-val { fill: none; stroke: #30a14e; stroke-width: 2; stroke-linejoin: round; }
.chart-wrap .line-inv { fill: none; stroke: #3d8bfd; stroke-width: 2; stroke-dasharray: 6 4; }
.chart-wrap .area-val { fill: rgba(48,161,78,.10); stroke: none; }
.chart-wrap .crosshair { stroke: var(--muted); stroke-width: 1; }
.chart-wrap .dot-val { fill: #30a14e; stroke: var(--bg-2); stroke-width: 2; }
.chart-wrap .dot-inv { fill: #3d8bfd; stroke: var(--bg-2); stroke-width: 2; }
.chart-tip { position: absolute; pointer-events: none; background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; font-size: 13px; min-width: 170px; box-shadow: 0 10px 30px rgba(0,0,0,.4); }
.chart-tip .tip-h { color: var(--muted); margin-bottom: 6px; }
.chart-tip .tip-row { display: flex; align-items: center; gap: 8px; }
.chart-tip .tip-row b { font-family: var(--mono); color: var(--text); }
.chart-tip .tip-row span { color: var(--muted); }
.chart-tip .tip-f { margin-top: 6px; font-family: var(--mono); font-weight: 600; }
@media (max-width: 560px) { .chart-card { padding: 14px; } }

/* Checkbox row */
.check { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 500; cursor: pointer; margin-top: 2px; }
.check input { width: 18px; height: 18px; accent-color: var(--green); cursor: pointer; }