/* BTL Assistant — public site identity. Dark base, gold accents, Spectral + IBM Plex (the BTL DNA), used as a tool:
   dark header/footer, light working surfaces, number cards. Mobile first; desktop widens the grid. */
:root {
  --bg: #1a110b; --bg2: #231811; --bg3: #2c1f16; --line: rgba(196, 154, 91, .32); --gold: #C49A5B; --gold2: #d9b276;
  --cream: #F4EFE4; --sub: #B89F7A; --paper: #FBF8F1; --paper2: #F1EBDD; --ink: #1d1611; --ink2: #5c4d3c; --rule: #e4dbc8;
  --green: #4f7f55; --red: #b4584b; --radius: 10px; --max: 1080px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body { background: var(--bg); color: var(--cream); font: 16px/1.55 'IBM Plex Sans', system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
h1, h2, h3, .serif { font-family: 'Spectral', Georgia, 'Times New Roman', serif; font-weight: 500; letter-spacing: -.01em; }
h1 { font-size: 34px; line-height: 1.15; }
h2 { font-size: 26px; line-height: 1.2; }
h3 { font-size: 19px; line-height: 1.3; }
p { margin: 0 0 12px; }
a { color: var(--gold); }
.mono { font-family: 'IBM Plex Mono', ui-monospace, Menlo, Consolas, monospace; font-size: 12px; letter-spacing: .14em; text-transform: uppercase; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 18px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 10px 18px; border-radius: 8px; border: 1px solid var(--line); background: transparent; color: var(--cream); font: 500 15px/1 'IBM Plex Sans', sans-serif; text-decoration: none; cursor: pointer; }
.btn.primary { background: var(--gold); color: var(--bg); border-color: var(--gold); font-weight: 600; }
.btn.primary:hover { background: var(--gold2); border-color: var(--gold2); }
.btn.ink { background: var(--ink); color: var(--cream); border-color: var(--ink); }
.btn.light { border-color: var(--rule); color: var(--ink); background: #fff; }
.btn.block { width: 100%; }

/* header / footer (dark) */
.top { position: sticky; top: 0; z-index: 5; background: rgba(26, 17, 11, .96); backdrop-filter: blur(6px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 58px; gap: 10px; }
.top .brand { color: var(--gold); text-decoration: none; display: flex; align-items: baseline; gap: 10px; }
.top .brand b { font: 500 22px 'IBM Plex Sans', sans-serif; letter-spacing: -.04em; color: var(--cream); }
.top .brand svg { width: 24px; height: 24px; margin-right: -2px; vertical-align: middle; }
.top .brand { align-items: center; gap: 0; }
.top nav { display: flex; gap: 6px; align-items: center; }
.top nav a { color: var(--sub); text-decoration: none; font-size: 14px; padding: 8px 10px; border-radius: 6px; }
.top nav a:hover { color: var(--cream); background: var(--bg3); }
.top nav .btn { min-height: 38px; padding: 6px 14px; }
@media (max-width: 640px) { .top nav a.hide-m { display: none; } }
footer { border-top: 1px solid var(--line); padding: 34px 0 44px; color: var(--sub); font-size: 14px; }
footer .wrap { display: grid; gap: 18px; }
footer .links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
footer a { color: var(--sub); text-decoration: none; }
footer a:hover { color: var(--gold); }
@media (min-width: 760px) { footer .wrap { grid-template-columns: 1.4fr 1fr; align-items: start; } }

/* hero (dark) */
.hero { padding: 48px 0 36px; }
.hero .wrap { display: grid; gap: 28px; }
.hero h1 { color: var(--cream); margin: 10px 0 14px; max-width: 560px; }
.hero h1 em { font-style: normal; color: var(--gold); }
.hero .lead { color: var(--sub); font-size: 17px; max-width: 520px; }
.hero .cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 10px; }
.hero .fine { color: var(--sub); font-size: 13px; }
@media (min-width: 900px) { .hero { padding: 72px 0 56px; } .hero .wrap { grid-template-columns: 1.05fr 1fr; align-items: center; } h1 { font-size: 46px; } }

/* the product shown as itself: a chat exchange with a number card */
.demo { background: var(--paper); color: var(--ink); border-radius: 14px; border: 1px solid rgba(0, 0, 0, .08); box-shadow: 0 30px 60px rgba(0, 0, 0, .35); overflow: hidden; }
.demo .bar { background: var(--bg2); color: var(--sub); padding: 10px 14px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); }
.demo .body { padding: 16px; display: grid; gap: 12px; }
.demo .you { color: var(--ink2); font-size: 14px; }
.demo .you b { color: var(--ink); font-weight: 600; }
.demo .you .mono, .demo .bot .mono { display: block; color: var(--ink2); margin-bottom: 4px; letter-spacing: .12em; }
.demo .bot { background: #fff; border: 1px solid var(--rule); border-radius: 10px; padding: 12px 14px; font-size: 15px; }
.demo .bot p { margin: 0 0 8px; }
.demo .bot p:last-child { margin: 0; }
.nums { display: grid; grid-template-columns: 1fr; gap: 8px; margin: 10px 0; }
@media (min-width: 480px) { .nums { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 479px) { .num { display: grid; grid-template-columns: 1fr auto; align-items: baseline; column-gap: 10px; } .num .k { grid-column: 1 / -1; } .num .s { text-align: right; } }
.num { background: var(--paper2); border-radius: 8px; padding: 10px 10px 8px; }
.num .k { font-family: 'IBM Plex Mono', monospace; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink2); }
.num .v { font-family: 'Spectral', serif; font-size: 20px; color: var(--ink); line-height: 1.15; margin-top: 2px; }
.num .s { font-size: 12px; color: var(--ink2); }
.src { font-size: 12px; color: var(--ink2); border-top: 1px dashed var(--rule); padding-top: 8px; }

/* light sections */
.light { background: var(--paper); color: var(--ink); }
.light h2 { color: var(--ink); }
.light .sub { color: var(--ink2); }
.sec { padding: 48px 0; }
.sec .kicker { color: var(--gold); margin-bottom: 8px; }
.sec h2 { max-width: 620px; margin-bottom: 8px; }
.grid3 { display: grid; gap: 14px; margin-top: 24px; }
@media (min-width: 760px) { .grid3 { grid-template-columns: repeat(3, 1fr); } .sec { padding: 64px 0; } }
.tile { background: #fff; border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px; }
.tile h3 { margin-bottom: 6px; }
.tile p { color: var(--ink2); font-size: 15px; margin: 0; }
.tile .mono { color: var(--gold); display: block; margin-bottom: 8px; }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 24px; }
@media (min-width: 760px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat { border-top: 2px solid var(--gold); padding-top: 10px; }
.stat .v { font-family: 'Spectral', serif; font-size: 30px; line-height: 1.1; }
.stat .k { color: var(--sub); font-size: 13px; margin-top: 4px; }
.light .stat .k { color: var(--ink2); }
.quote { border-left: 3px solid var(--gold); padding: 6px 0 6px 16px; font-family: 'Spectral', serif; font-size: 19px; line-height: 1.4; max-width: 680px; }
.quote .who { font: 13px 'IBM Plex Sans', sans-serif; color: var(--sub); margin-top: 8px; }
.steps { display: grid; gap: 12px; margin-top: 20px; counter-reset: s; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step { color: var(--ink); position: relative; padding: 14px 14px 14px 52px; background: #fff; border: 1px solid var(--rule); border-radius: var(--radius); }
.step:before { counter-increment: s; content: counter(s); position: absolute; left: 14px; top: 12px; width: 28px; height: 28px; border-radius: 50%; background: var(--bg); color: var(--gold); font: 500 15px 'Spectral', serif; display: flex; align-items: center; justify-content: center; }
.step b { display: block; margin-bottom: 2px; }
.step span { color: var(--ink2); font-size: 14px; }

/* pricing */
.plans { display: grid; gap: 14px; margin-top: 24px; }
@media (min-width: 700px) { .plans { grid-template-columns: repeat(2, 1fr); align-items: stretch; } }
@media (min-width: 1100px) { .plans { grid-template-columns: repeat(4, 1fr); } } /* §38: Free, Assistant, Pro, Founding */
.plan .say { color: var(--ink); font-size: 15px; line-height: 1.5; }
.cmpwrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.plan { background: #fff; border: 1px solid var(--rule); border-radius: 12px; padding: 20px; display: flex; flex-direction: column; gap: 10px; position: relative; }
.plan.anchor { border-color: var(--gold); box-shadow: 0 16px 40px rgba(196, 154, 91, .18); }
.plan .tag { position: absolute; top: -12px; left: 18px; background: var(--gold); color: var(--bg); font: 600 11px/1 'IBM Plex Mono', monospace; letter-spacing: .12em; text-transform: uppercase; padding: 7px 10px; border-radius: 999px; }
.plan .price { font-family: 'Spectral', serif; font-size: 38px; line-height: 1; color: var(--ink); }
.plan .price small { font: 14px 'IBM Plex Sans', sans-serif; color: var(--ink2); }
.plan .was { color: var(--ink2); font-size: 14px; }
.plan ul { list-style: none; padding: 0; margin: 4px 0 8px; display: grid; gap: 6px; font-size: 15px; }
.plan li { padding-left: 20px; position: relative; }
.plan li:before { content: '—'; position: absolute; left: 0; color: var(--gold); }
.plan .btn { margin-top: auto; }
.plan .note { color: var(--ink2); font-size: 13px; }
.topup { margin-top: 18px; background: var(--paper2); border-radius: 10px; padding: 14px 16px; display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; justify-content: space-between; font-size: 15px; }
table.cmp { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 14px; background: #fff; border: 1px solid var(--rule); border-radius: 10px; overflow: hidden; }
table.cmp th, table.cmp td { padding: 10px 12px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
table.cmp th { background: var(--paper2); font-weight: 600; }
table.cmp td:not(:first-child), table.cmp th:not(:first-child) { text-align: center; }
.faq { display: grid; gap: 8px; margin-top: 18px; max-width: 760px; }
.faq details { background: #fff; border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 8px 0 0; color: var(--ink2); font-size: 15px; }

/* forms and documents */
form.lead { display: grid; gap: 10px; max-width: 520px; margin-top: 18px; }
form.lead label { display: grid; gap: 4px; font-size: 14px; color: var(--ink2); }
form.lead input, form.lead textarea, form.lead select { width: 100%; padding: 11px 12px; border: 1px solid var(--rule); border-radius: 8px; background: #fff; color: var(--ink); font: 15px 'IBM Plex Sans', sans-serif; }
form.lead textarea { min-height: 96px; resize: vertical; }
form.lead .ok { color: var(--green); } form.lead .err { color: var(--red); }
.doc { max-width: 760px; }
.doc h1 { font-size: 30px; margin: 8px 0 6px; }
.doc h2 { font-size: 20px; margin: 26px 0 8px; }
.doc p, .doc li { color: var(--ink2); font-size: 15px; }
.doc ul { padding-left: 20px; margin: 0 0 12px; }
.doc .meta { color: var(--ink2); font-size: 13px; margin-bottom: 18px; }
.doc .box { background: var(--paper2); border-radius: 8px; padding: 12px 14px; margin: 12px 0; font-size: 14px; }