/* ============================================================
   SWITCHBACK — Deploy Safety / Instant Rollback SaaS
   Design system: "The Switchback Path" — terminal amber on charcoal
   ============================================================ */

:root{
  --bg:       #15161A;
  --bg-2:     #1D1F24;
  --bg-3:     #24262C;
  --ink:      #ECEDEF;
  --ink-soft: #9498A0;
  --amber:    #E8A23D;
  --amber-2:  #C98529;
  --mint:     #5FBFA5;
  --line:     #2A2D33;
  --white:    #FFFFFF;

  --font-display: 'JetBrains Mono', 'Courier New', monospace;
  --font-body:    'Inter', -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  --max: 1180px;
  --pad: clamp(24px, 5vw, 64px);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{ margin:0; background:var(--bg); color:var(--ink); font-family:var(--font-body); font-size:16px; line-height:1.6; -webkit-font-smoothing:antialiased; }
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--font-display); font-weight:700; margin:0; color:var(--ink); letter-spacing:-0.01em; }
p{ margin:0; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }
:focus-visible{ outline:2px solid var(--amber); outline-offset:3px; }
code, .mono{ font-family:var(--font-mono); }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.01ms !important; transition-duration:0.01ms !important; scroll-behavior:auto !important; }
}

.wrap{ max-width:var(--max); margin:0 auto; padding-left:var(--pad); padding-right:var(--pad); }
.eyebrow{ font-family:var(--font-mono); font-size:12px; letter-spacing:0.1em; text-transform:uppercase; color:var(--amber); }

/* ---------- Nav ---------- */
.nav{ position:sticky; top:0; z-index:50; background:rgba(21,22,26,0.9); backdrop-filter:blur(8px); border-bottom:1px solid var(--line); }
.nav .wrap{ display:flex; align-items:center; justify-content:space-between; height:72px; }
.nav-mark{ font-family:var(--font-display); font-size:18px; font-weight:700; }
.nav-mark span{ color:var(--amber); }
.nav-links{ display:flex; align-items:center; gap:32px; }
.nav-links a{ font-size:14px; color:var(--ink-soft); border-bottom:1px solid transparent; padding-bottom:3px; transition:border-color .2s, color .2s; }
.nav-links a:hover, .nav-links a.active{ color:var(--ink); border-color:var(--amber); }
.nav-cta{ font-size:13px; padding:9px 18px; border-radius:5px; background:var(--amber); color:#191203; font-weight:600; transition:background .2s; white-space:nowrap; }
.nav-cta:hover{ background:#F2B355; }
.nav-toggle{ display:none; background:none; border:0; padding:8px; }
.nav-toggle span{ display:block; width:22px; height:2px; background:var(--ink); margin:5px 0; }
@media (max-width:860px){
  .nav-links{ position:fixed; inset:72px 0 0 0; background:var(--bg); flex-direction:column; align-items:flex-start; gap:0; padding:8px var(--pad) 24px; transform:translateY(-8px); opacity:0; visibility:hidden; transition:opacity .2s, transform .2s, visibility .2s; }
  .nav-links.open{ opacity:1; visibility:visible; transform:translateY(0); }
  .nav-links a{ width:100%; padding:16px 0; border-bottom:1px solid var(--line); font-size:16px; }
  .nav-links .nav-cta{ margin-top:16px; text-align:center; display:inline-block; }
  .nav-toggle{ display:block; }
}

/* ---------- Hero ---------- */
.hero{ padding:84px 0 56px; }
.hero-grid{ display:grid; grid-template-columns:1fr; gap:48px; text-align:center; max-width:820px; margin:0 auto; }
.hero h1{ font-size:clamp(34px,5.6vw,58px); line-height:1.12; }
.hero-lede{ max-width:52ch; color:var(--ink-soft); font-size:17px; margin:22px auto 0; }
.hero-cta{ margin-top:30px; display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
.hero-path{ margin-top:12px; }
@media (max-width:700px){ .hero-cta{ flex-direction:column; align-items:center; } }

/* ---------- Switchback path diagram (signature element) ---------- */
.path-card{ background:var(--bg-2); border:1px solid var(--line); border-radius:10px; padding:32px; max-width:900px; margin:0 auto; }
.path-node{ display:flex; align-items:center; gap:14px; padding:10px 0; }
.path-dot{ width:10px; height:10px; border-radius:50%; background:var(--amber); flex:0 0 auto; }
.path-dot.safe{ background:var(--mint); }
.path-time{ font-family:var(--font-mono); font-size:12.5px; color:var(--ink-soft); min-width:64px; }
.path-desc{ font-size:14.5px; color:var(--ink); }
.path-line{ width:1px; height:20px; background:var(--line); margin-left:5px; }

/* ---------- Stat strip ---------- */
.stat-strip{ border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:40px 0; background:var(--bg-2); }
.stat-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:28px; }
.stat-figure{ font-family:var(--font-mono); font-size:clamp(24px,2.6vw,32px); color:var(--amber); }
.stat-underline{ width:36px; height:2px; background:var(--amber); margin:10px 0 8px; }
.stat-label{ font-size:12px; color:var(--ink-soft); text-transform:uppercase; letter-spacing:0.04em; font-family:var(--font-mono); }
@media (max-width:760px){ .stat-grid{ grid-template-columns:repeat(2,1fr); row-gap:28px; } }

/* ---------- Sections ---------- */
.section{ padding:92px 0; }
.section-tight{ padding:56px 0; }
.section-head{ max-width:620px; margin:0 auto 44px; text-align:center; }
.section-head.left{ text-align:left; margin:0 0 44px; }
.section-head h2{ font-size:clamp(26px,3vw,38px); margin-top:12px; line-height:1.2; }
.section-head p{ color:var(--ink-soft); margin-top:14px; font-size:16px; }

/* ---------- Quote ---------- */
.quote-block{ max-width:720px; margin:0 auto; text-align:center; }
.quote-block p{ font-family:var(--font-display); font-weight:500; font-size:clamp(19px,2.1vw,24px); line-height:1.5; color:var(--ink); }
.quote-attr{ margin-top:18px; font-size:14px; color:var(--ink-soft); font-family:var(--font-body); }

/* ---------- Feature grid ---------- */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.grid-3 > *{ background:var(--bg-2); border:1px solid var(--line); border-radius:10px; padding:30px; }
@media (max-width:860px){ .grid-3{ grid-template-columns:1fr; } }
.pillar-index{ font-family:var(--font-mono); color:var(--amber); font-size:12.5px; }
.pillar h3{ font-size:18px; margin-top:14px; }
.pillar p{ margin-top:12px; color:var(--ink-soft); font-size:14.5px; }
.pillar a.more{ display:inline-block; margin-top:16px; font-size:13px; border-bottom:1px solid var(--amber); color:var(--amber); }

/* ---------- CTA banner ---------- */
.cta-banner{ text-align:center; padding:64px 0; border-top:1px solid var(--line); }
.cta-banner h2{ font-size:clamp(24px,2.8vw,34px); margin-bottom:26px; }
.btn{ display:inline-block; padding:13px 24px; border-radius:6px; font-size:14px; font-weight:600; border:1px solid var(--line); color:var(--ink); white-space:nowrap; transition:border-color .2s, color .2s; }
.btn:hover{ border-color:var(--amber); color:var(--amber); }
.btn-solid{ background:var(--amber); border-color:var(--amber); color:#191203; }
.btn-solid:hover{ background:#F2B355; border-color:#F2B355; color:#191203; }

/* ---------- Footer ---------- */
.footer{ border-top:1px solid var(--line); padding:48px 0 32px; }
.footer-grid{ display:grid; grid-template-columns:1.3fr 1fr 1fr 1fr; gap:32px; }
.footer h4{ font-size:12.5px; letter-spacing:0.04em; text-transform:uppercase; color:var(--ink-soft); margin-bottom:16px; font-family:var(--font-mono); font-weight:500; }
.footer li{ margin-bottom:10px; font-size:14px; color:var(--ink-soft); }
.footer li a:hover{ color:var(--ink); }
.footer-mark{ font-family:var(--font-display); font-size:17px; margin-bottom:10px; color:var(--ink); }
.footer-note{ color:var(--ink-soft); font-size:13.5px; max-width:32ch; }
.footer-bottom{ margin-top:40px; padding-top:20px; border-top:1px solid var(--line); display:flex; justify-content:space-between; font-size:12.5px; color:var(--ink-soft); }
@media (max-width:760px){ .footer-grid{ grid-template-columns:1fr 1fr; } .footer-bottom{ flex-direction:column; gap:8px; } }

/* ---------- Pricing table ---------- */
.pricing-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.price-card{ background:var(--bg-2); border:1px solid var(--line); border-radius:10px; padding:32px; display:flex; flex-direction:column; }
.price-card.featured{ border-color:var(--amber); }
.price-name{ font-family:var(--font-mono); font-size:13px; color:var(--amber); text-transform:uppercase; letter-spacing:0.05em; }
.price-figure{ font-family:var(--font-display); font-size:38px; margin-top:14px; }
.price-figure span{ font-size:14px; color:var(--ink-soft); font-family:var(--font-body); }
.price-desc{ color:var(--ink-soft); font-size:14px; margin-top:10px; }
.price-list{ margin-top:22px; flex:1; }
.price-list li{ font-size:13.5px; color:var(--ink-soft); padding:8px 0; border-top:1px solid var(--line); }
.price-list li:first-child{ border-top:0; }
.price-card .btn{ margin-top:22px; text-align:center; }
@media (max-width:860px){ .pricing-grid{ grid-template-columns:1fr; } }

/* ---------- Changelog ---------- */
.changelog{ border-top:1px solid var(--line); }
.changelog-row{ display:grid; grid-template-columns:140px 1fr; gap:28px; padding:26px 0; border-bottom:1px solid var(--line); }
.changelog-date{ font-family:var(--font-mono); color:var(--amber); font-size:13px; }
.changelog-row h4{ font-size:16px; font-family:var(--font-body); font-weight:600; }
.changelog-row p{ margin-top:6px; color:var(--ink-soft); font-size:14.5px; }
.changelog-row a{ display:inline-block; margin-top:10px; font-size:13px; border-bottom:1px solid var(--amber); color:var(--amber); }
@media (max-width:700px){ .changelog-row{ grid-template-columns:1fr; gap:6px; } }

/* ---------- Article / changelog entry ---------- */
.article-head{ max-width:760px; margin:0 auto; text-align:left; }
.article-head h1{ font-size:clamp(28px,3.6vw,40px); margin-top:14px; line-height:1.2; }
.article-body{ max-width:680px; margin:44px auto 0; font-size:17px; }
.article-body p{ margin-bottom:22px; color:var(--ink-soft); }
.article-body h3{ font-size:19px; margin:32px 0 14px; color:var(--ink); }
.article-body .drop{ font-family:var(--font-mono); font-size:12px; color:var(--ink-soft); letter-spacing:0.05em; text-transform:uppercase; margin:36px auto 0; max-width:680px; }
.article-body code{ background:var(--bg-2); padding:2px 6px; border-radius:4px; font-size:14px; color:var(--mint); }

/* ---------- Contact / demo ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:56px; }
.field{ margin-bottom:20px; }
.field label{ display:block; font-size:13px; color:var(--ink-soft); margin-bottom:8px; font-family:var(--font-mono); }
.field input, .field textarea, .field select{ width:100%; border:1px solid var(--line); background:var(--bg-2); padding:12px 14px; font-family:var(--font-body); font-size:15px; color:var(--ink); border-radius:6px; }
.field textarea{ min-height:110px; resize:vertical; }
.info-row{ display:flex; gap:16px; padding:16px 0; border-bottom:1px solid var(--line); }
.info-row:first-child{ border-top:1px solid var(--line); }
.info-row h4{ font-size:13.5px; font-family:var(--font-mono); font-weight:500; min-width:110px; color:var(--ink-soft); }
.info-row p{ color:var(--ink); font-size:14.5px; }
@media (max-width:860px){ .contact-grid{ grid-template-columns:1fr; gap:36px; } }

/* ---------- Scroll reveal ---------- */
.reveal{ opacity:0; transform:translateY(14px); transition:opacity .7s ease, transform .7s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }

/* ---------- Page header ---------- */
.page-header{ padding:56px 0 44px; border-bottom:1px solid var(--line); text-align:center; }
.page-header h1{ font-size:clamp(30px,4vw,44px); margin-top:14px; max-width:20ch; margin-left:auto; margin-right:auto; }
.page-header p{ margin-top:16px; max-width:52ch; color:var(--ink-soft); font-size:16px; margin-left:auto; margin-right:auto; }