/* ─────────────────────────────────────────────────────────────
   SenderoGo — marketing site stylesheet
   Ocean Blue brand · DM Sans · calm/technical (Obsidian-adjacent)
   ───────────────────────────────────────────────────────────── */

:root{
  /* Ocean Blue */
  --navy-900:#08152b; --navy-850:#0b1d38; --navy-800:#0f2644; --navy-700:#16375f;
  --blue-600:#1a5bcc; --blue-500:#2563eb; --blue-400:#3b82f6; --blue-300:#60a5fa;
  --blue-100:#dbeafe; --blue-50:#eff6ff;

  /* surfaces (dark) */
  --bg:#070f20;
  --bg-2:#0a1730;
  --panel:#0d1d3a;
  --panel-2:#11244a;
  --line:rgba(120,160,220,.14);
  --line-2:rgba(120,160,220,.22);

  /* ink */
  --ink:#eaf1fb;
  --ink-2:#a8bcda;
  --ink-3:#6f86ac;

  --accent:#3b82f6;
  --accent-2:#60a5fa;
  --glow:rgba(37,99,235,.45);

  --radius:14px; --radius-sm:10px; --radius-lg:22px;
  --maxw:1180px;
  --font:'DM Sans',system-ui,-apple-system,sans-serif;
  --mono:'DM Mono',ui-monospace,'SF Mono',monospace;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);background:var(--bg);color:var(--ink);
  line-height:1.55;-webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(900px 520px at 78% -8%, rgba(37,99,235,.20), transparent 60%),
    radial-gradient(700px 480px at 8% 4%, rgba(29,64,140,.16), transparent 55%);
  background-attachment:fixed;
}
a{color:var(--accent-2);text-decoration:none;transition:color .16s}
a:hover{color:#93c5fd}
img,svg{display:block}
::selection{background:rgba(37,99,235,.34);color:#fff}

/* ── layout ── */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
section{position:relative}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--blue-300);font-weight:500}

/* ── header ── */
.site-head{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);
  background:rgba(7,15,32,.72);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:32px;height:66px;max-width:var(--maxw);margin:0 auto;padding:0 28px}
.brand{display:flex;align-items:center;gap:11px;margin-right:6px}
.brand .wm{height:22px;width:auto}
.nav-links{display:flex;align-items:center;gap:28px;margin-left:4px}
.nav-links a{color:var(--ink-2);font-size:15px;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-spacer{flex:1}
.nav-cta{display:flex;align-items:center;gap:14px}

/* ── buttons ── */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--font);font-weight:600;
  font-size:15px;line-height:1;padding:12px 20px;border-radius:11px;border:1px solid transparent;
  cursor:pointer;transition:transform .12s,background .16s,border-color .16s,box-shadow .16s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--blue-500);color:#fff;box-shadow:0 8px 30px -8px var(--glow)}
.btn-primary:hover{background:var(--blue-400);color:#fff;box-shadow:0 12px 38px -8px var(--glow)}
.btn-ghost{background:rgba(120,160,220,.08);color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{background:rgba(120,160,220,.14);color:var(--ink)}
.btn-lg{padding:15px 26px;font-size:16px;border-radius:12px}
.btn-sm{padding:9px 15px;font-size:14px;border-radius:9px}

/* ── typography scale ── */
h1,h2,h3{line-height:1.08;letter-spacing:-.025em;font-weight:700}
.display{font-size:clamp(40px,6vw,74px);letter-spacing:-.04em}
.h2{font-size:clamp(30px,4vw,46px)}
.h3{font-size:clamp(21px,2.4vw,27px);letter-spacing:-.02em}
.lead{font-size:clamp(18px,2vw,21px);color:var(--ink-2);line-height:1.6;text-wrap:pretty}
.muted{color:var(--ink-2)}
.dim{color:var(--ink-3)}

/* ── hero ── */
.hero{padding:78px 0 40px;text-align:center}
.hero .display{max-width:16ch;margin:22px auto 0}
.hero .grad{background:linear-gradient(100deg,#93c5fd,#3b82f6 55%,#1a5bcc);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-wm{display:flex;justify-content:center;margin:22px auto 0}
.hero-wm svg{width:min(620px,84vw);height:auto}
.hero .lead{max-width:60ch;margin:24px auto 0}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.hero-note{margin-top:16px;font-size:13.5px;color:var(--ink-3);font-family:var(--mono);letter-spacing:.02em}

/* ── section rhythm ── */
.section{padding:76px 0}
.section-head{max-width:64ch}
.section-head.center{margin:0 auto;text-align:center}
.section-head .h2{margin-top:14px}
.section-head .lead{margin-top:16px}

/* ── feature grid ── */
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:linear-gradient(180deg,rgba(19,42,80,.55),rgba(11,26,52,.5));
  border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.card:hover{border-color:var(--line-2)}
.card .ico{width:42px;height:42px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:rgba(37,99,235,.14);border:1px solid rgba(59,130,246,.28);color:var(--blue-300);margin-bottom:16px}
.card .ico svg{width:22px;height:22px}
.card h3{font-size:18px;letter-spacing:-.01em}
.card p{color:var(--ink-2);font-size:15px;margin-top:8px;text-wrap:pretty}

/* ── steps ── */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:step}
.step{position:relative;padding:26px 24px;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(11,26,52,.4)}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);
  font-family:var(--mono);font-size:13px;color:var(--blue-300);letter-spacing:.1em}
.step h3{font-size:19px;margin-top:12px}
.step p{color:var(--ink-2);font-size:15px;margin-top:8px}

/* ── divider / bands ── */
.hr{height:1px;background:linear-gradient(90deg,transparent,var(--line-2),transparent);border:0;margin:0}

/* ── footer ── */
.site-foot{border-top:1px solid var(--line);margin-top:40px;padding:56px 0 46px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
.foot-col h4{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:600;margin-bottom:14px}
.foot-col a{display:block;color:var(--ink-2);font-size:15px;padding:5px 0}
.foot-col a:hover{color:var(--ink)}
.foot-brand p{color:var(--ink-3);font-size:14px;margin-top:14px;max-width:34ch}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:44px;padding-top:24px;
  border-top:1px solid var(--line);color:var(--ink-3);font-size:13.5px;flex-wrap:wrap;gap:12px}
.foot-bottom .mono{font-family:var(--mono)}

/* ── receiver mock (hero product visual) ── */
.mock-wrap{margin:56px auto 0;max-width:1000px;position:relative}
.mock-wrap::before{content:"";position:absolute;inset:-8% -4% -20%;
  background:radial-gradient(60% 60% at 50% 0%,rgba(37,99,235,.4),transparent 70%);filter:blur(30px);z-index:0}
.mock{position:relative;z-index:1;border:1px solid var(--line-2);border-radius:16px;overflow:hidden;
  background:var(--navy-900);box-shadow:0 40px 120px -30px rgba(0,0,0,.7),0 0 0 1px rgba(255,255,255,.03)}
.mock-bar{display:flex;align-items:center;gap:8px;padding:11px 15px;background:rgba(11,26,52,.9);border-bottom:1px solid var(--line)}
.mock-bar .dot{width:11px;height:11px;border-radius:50%;background:#28324a}
.mock-bar .mt{margin-left:12px;font-family:var(--mono);font-size:12px;color:var(--ink-3)}
.mock-bar .live{margin-left:auto;display:flex;align-items:center;gap:7px;font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:#ff5b5b;font-weight:500}
.mock-bar .live .d{width:8px;height:8px;border-radius:50%;background:#ff3b3b;box-shadow:0 0 0 0 rgba(255,59,59,.6);animation:pulse 1.6s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,59,59,.5)}70%{box-shadow:0 0 0 7px rgba(255,59,59,0)}100%{box-shadow:0 0 0 0 rgba(255,59,59,0)}}
.mock-body{display:grid;grid-template-columns:1fr 232px;min-height:360px}
.feeds{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:16px}
.feed{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--navy-850);position:relative;aspect-ratio:16/10}
.feed .thumb{position:absolute;inset:0}
.feed .meta{position:absolute;left:0;right:0;bottom:0;padding:9px 11px;
  background:linear-gradient(0deg,rgba(6,12,26,.9),transparent);display:flex;justify-content:space-between;align-items:flex-end}
.feed .name{font-size:12.5px;font-weight:600;color:#eaf1fb}
.feed .dev{font-size:10.5px;color:var(--ink-2);font-family:var(--mono)}
.feed .rec{font-family:var(--mono);font-size:10px;color:#ff6b6b;display:flex;align-items:center;gap:5px}
.feed .rec::before{content:"";width:6px;height:6px;border-radius:50%;background:#ff3b3b}
.mon{border-left:1px solid var(--line);padding:16px;background:rgba(9,18,38,.6);display:flex;flex-direction:column;gap:14px}
.mon .mh{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:600}
.stat{display:flex;justify-content:space-between;align-items:baseline;font-size:13px}
.stat .k{color:var(--ink-2)}
.stat .v{font-family:var(--mono);color:var(--ink);font-size:12.5px}
.bar{height:5px;border-radius:3px;background:rgba(120,160,220,.14);overflow:hidden;margin-top:5px}
.bar i{display:block;height:100%;border-radius:3px;background:linear-gradient(90deg,var(--blue-500),var(--blue-300))}

/* ── single-preview mock ── */
.mock-body.single{grid-template-columns:1fr 232px}
.preview{padding:16px;display:flex;flex-direction:column;gap:12px}
.preview-frame{position:relative;border-radius:11px;aspect-ratio:16/9;border:1px solid var(--line);overflow:hidden}
.preview-frame::after{content:"";position:absolute;inset:0;background:radial-gradient(120% 90% at 50% 40%,rgba(255,255,255,.05),rgba(6,12,26,.35) 80%)}
.pv-tag{position:absolute;left:12px;bottom:12px;z-index:1;font-size:12.5px;font-weight:600;color:#eaf1fb;background:rgba(6,12,26,.55);padding:5px 10px;border-radius:7px;backdrop-filter:blur(4px)}
.pv-res{position:absolute;right:12px;top:12px;z-index:1;font-family:var(--mono);font-size:11px;color:var(--ink-2);background:rgba(6,12,26,.5);padding:4px 9px;border-radius:6px}
.preview-strip{display:flex;gap:10px;flex-wrap:wrap}
.ps-item{flex:1;min-width:150px;border:1px solid var(--line);border-radius:9px;padding:10px 12px;background:rgba(11,26,52,.45);display:flex;flex-direction:column;gap:3px}
.ps-item .k{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);font-weight:600}
.ps-item .v{font-family:var(--mono);font-size:12.5px;color:var(--ink)}

/* ── SRT flow diagram ── */
.flow{padding:30px 26px;display:flex;flex-direction:column;gap:0}
.flow-node{display:flex;flex-direction:column;gap:4px;padding:18px 20px;border:1px solid var(--line-2);border-radius:12px;background:rgba(11,26,52,.5)}
.fn-ico{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:rgba(37,99,235,.14);border:1px solid rgba(59,130,246,.28);color:var(--blue-300);margin-bottom:6px}
.fn-ico svg{width:22px;height:22px}
.fn-l{font-size:16px;font-weight:700;letter-spacing:-.01em}
.fn-s{font-size:13px;color:var(--ink-3);font-family:var(--mono)}
.flow-link{display:flex;align-items:center;justify-content:center;position:relative;height:46px}
.flow-link::before{content:"";position:absolute;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--blue-500),var(--blue-300));left:50%;transform:translateX(-50%)}
.fl-label{position:relative;z-index:1;font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--blue-300);background:var(--navy-900);padding:4px 10px;border:1px solid var(--line-2);border-radius:999px}
/* horizontal flow (guide) */
.srt-graphic{padding:34px 30px;display:flex;align-items:center;justify-content:center}
.srt-graphic svg{width:100%;height:auto;max-width:440px}
.flow-h{flex-direction:row;align-items:stretch;gap:0;margin-top:26px;padding:0}
.flow-h .flow-node{flex:1}
.flow-link.h{height:auto;width:74px;flex-shrink:0}
.flow-link.h::before{top:50%;bottom:auto;left:0;right:0;width:auto;height:2px;transform:translateY(-50%);background:linear-gradient(90deg,var(--blue-500),var(--blue-300))}
@media(max-width:640px){.flow-h{flex-direction:column}.flow-link.h{width:auto;height:46px}.flow-link.h::before{top:0;bottom:0;left:50%;right:auto;width:2px;height:auto;transform:translateX(-50%);background:linear-gradient(180deg,var(--blue-500),var(--blue-300))}}

/* ── platform pills ── */
.plats{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:30px}
.plat{display:inline-flex;align-items:center;gap:8px;padding:9px 15px;border-radius:999px;
  border:1px solid var(--line-2);background:rgba(120,160,220,.06);font-size:13.5px;color:var(--ink-2);font-weight:500}
.plat svg{width:15px;height:15px;opacity:.8}

/* ── spec table ── */
.spec{width:100%;border-collapse:collapse;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec th,.spec td{text-align:left;padding:15px 20px;border-bottom:1px solid var(--line);font-size:15px}
.spec th{color:var(--ink-3);font-weight:600;font-size:12px;letter-spacing:.12em;text-transform:uppercase;background:rgba(11,26,52,.5)}
.spec td:first-child{color:var(--ink-2);width:34%}
.spec td:last-child{font-family:var(--mono);font-size:13.5px;color:var(--ink)}
.spec tr:last-child td{border-bottom:0}

/* ── cta band ── */
.cta-band{text-align:center;padding:80px 28px;border:1px solid var(--line);border-radius:var(--radius-lg);
  background:radial-gradient(80% 140% at 50% 0%,rgba(37,99,235,.22),transparent 60%),rgba(11,26,52,.5)}
.cta-band .h2{margin-bottom:12px}
.cta-band .lead{max-width:52ch;margin:0 auto 26px}

/* ── page hero (subpages) ── */
.page-hero{padding:70px 0 8px;text-align:center}
.page-hero .display{font-size:clamp(36px,5vw,58px);margin:16px auto 0;max-width:18ch}
.page-hero .lead{max-width:56ch;margin:18px auto 0}

/* ── faq ── */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;list-style:none;padding:20px 4px;font-size:18px;font-weight:600;
  display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);font-size:22px;color:var(--blue-300);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{color:var(--ink-2);font-size:15.5px;padding:0 4px 22px;max-width:70ch;text-wrap:pretty}

/* ── download cards ── */
.dl-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.dl-card{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:rgba(11,26,52,.42)}
.dl-card .role{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue-300)}
.dl-card h3{font-size:24px;margin-top:10px}
.dl-card p{color:var(--ink-2);font-size:15px;margin-top:8px}
.dl-os{display:flex;flex-direction:column;gap:10px;margin-top:22px}
.dl-os a{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;border-radius:11px;
  border:1px solid var(--line-2);background:rgba(120,160,220,.06);color:var(--ink);font-weight:600;font-size:15px}
.dl-os a:hover{background:rgba(37,99,235,.14);border-color:rgba(59,130,246,.4);color:#fff}
.dl-os .os-l{display:flex;align-items:center;gap:12px}
.dl-os .os-l svg{width:20px;height:20px;color:var(--blue-300)}
.dl-os .os-v{font-family:var(--mono);font-size:12px;color:var(--ink-3);font-weight:400}

/* ── download extras ── */
.dl-os a.soon{opacity:.72;cursor:default}
.dl-os a.soon:hover{background:rgba(120,160,220,.06);border-color:var(--line-2);color:var(--ink)}
.setup{margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}
.setup-h{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:600;margin-bottom:8px}
.setup p{color:var(--ink-2);font-size:14.5px;margin:6px 0}
.codeblock{font-family:var(--mono);font-size:13px;color:var(--blue-100);background:var(--navy-900);
  border:1px solid var(--line-2);border-radius:9px;padding:13px 15px;margin:6px 0;overflow-x:auto;white-space:pre}

/* ── pricing ── */
.price-card{max-width:440px;margin:0 auto;border:1px solid var(--line-2);border-radius:var(--radius-lg);
  padding:38px;background:radial-gradient(90% 120% at 50% 0%,rgba(37,99,235,.16),transparent 60%),rgba(11,26,52,.5);text-align:center}
.price-card .tag{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue-300)}
.price-card .amt{font-size:64px;font-weight:700;letter-spacing:-.04em;margin-top:10px;line-height:1}
.price-card .amt span{font-size:20px;color:var(--ink-3);font-weight:500}
.price-list{text-align:left;margin:26px 0;display:flex;flex-direction:column;gap:12px}
.price-list li{display:flex;gap:11px;align-items:flex-start;list-style:none;color:var(--ink-2);font-size:15px}
.price-list svg{width:19px;height:19px;color:var(--blue-300);flex-shrink:0;margin-top:1px}

/* ── docs layout ── */
.docs{display:grid;grid-template-columns:220px 1fr;gap:48px;align-items:start}
.docs-nav{position:sticky;top:90px;display:flex;flex-direction:column;gap:3px}
.docs-nav a{color:var(--ink-2);font-size:14.5px;padding:7px 12px;border-radius:8px;border-left:2px solid transparent}
.docs-nav a:hover{color:var(--ink);background:rgba(120,160,220,.06)}
.docs-body h2{font-size:30px;margin:0 0 6px;scroll-margin-top:90px}
section[id],.docs-body .block[id]{scroll-margin-top:88px}
.docs-body h3{font-size:20px;margin:34px 0 10px}
.docs-body p{color:var(--ink-2);font-size:16px;margin:12px 0;max-width:70ch;text-wrap:pretty}
.docs-body ul,.docs-body ol{color:var(--ink-2);font-size:16px;margin:12px 0 12px 22px;max-width:68ch}
.docs-body li{margin:7px 0}
.docs-body .block{margin-bottom:52px}
.callout{border:1px solid rgba(59,130,246,.3);background:rgba(37,99,235,.08);border-radius:12px;
  padding:16px 18px;font-size:15px;color:var(--ink-2);display:flex;gap:12px;margin:18px 0}
.callout svg{width:20px;height:20px;color:var(--blue-300);flex-shrink:0;margin-top:1px}
code{font-family:var(--mono);font-size:.88em;background:rgba(120,160,220,.12);padding:2px 6px;border-radius:5px;color:var(--blue-100)}

/* ── responsive ── */
@media(max-width:900px){
  .grid-3,.steps{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .mock-body{grid-template-columns:1fr}
  .mon{border-left:0;border-top:1px solid var(--line);flex-direction:row;flex-wrap:wrap;gap:18px}
  .docs{grid-template-columns:1fr}.docs-nav{display:none}
  .dl-grid,.grid-2{grid-template-columns:1fr}
  .nav-links{display:none}
}
@media(max-width:560px){
  .hide-sm{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
  .feeds{grid-template-columns:1fr}
  .foot-bottom{flex-direction:column;align-items:flex-start}
}

/* ── site additions (production) ── */
/* legal/reference article typography built on .docs-body */
.updated{font-family:var(--mono);font-size:12.5px;color:var(--ink-3);letter-spacing:.04em}
.docs-body table{width:100%;border-collapse:collapse;margin:14px 0;font-size:15px}
.docs-body th,.docs-body td{text-align:left;padding:11px 14px;border:1px solid var(--line);color:var(--ink-2);vertical-align:top}
.docs-body th{color:var(--ink-3);font-weight:600;font-size:12px;letter-spacing:.1em;text-transform:uppercase;background:rgba(11,26,52,.5)}
.docs-body td:first-child{color:var(--ink);white-space:nowrap}
.docs-body strong{color:var(--ink)}
.docs-body blockquote{border-left:3px solid rgba(59,130,246,.5);padding:6px 0 6px 18px;margin:16px 0;color:var(--ink-2)}
.contact-card{max-width:560px;margin:0 auto;text-align:center}
.contact-card .mail{font-size:clamp(20px,3vw,28px);font-weight:700;letter-spacing:-.01em;display:inline-block;margin-top:8px}
.err-wrap{min-height:52vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:14px;padding:60px 28px}