/* Backstop — kouzmitch.net/backstop */
:root {
  color-scheme: light dark;
  --paper: #f6f3ec;        /* warm off-white ground */
  --paper-2: #ede8dd;      /* slightly deeper, for the pricing band */
  --ink: #1b3a4b;          /* from the icon */
  --ink-2: #122a37;
  --text: #1f2a30;
  --muted: #5f6b72;
  --rule: #d9d2c3;
  --amber: #c8862b;        /* one accent, used sparingly */
  --on-ink: #f6f3ec;
  --on-ink-muted: #b9c9d2;
  --shadow: 0 30px 60px -20px rgba(18, 42, 55, .45), 0 10px 20px -10px rgba(18, 42, 55, .25);
  --display: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --btn: var(--ink); --btn-fg: var(--on-ink); --btn-hover: var(--ink-2);
  --mark: var(--ink);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14191c; --paper-2: #1a2126; --ink: #0f1f28; --ink-2: #0a161d;
    --text: #e4e6e3; --muted: #9aa6ac; --rule: #2b353b; --amber: #d9a052;
    --on-ink: #eef2f0; --on-ink-muted: #8fa5b1;
    --shadow: 0 30px 60px -20px rgba(0,0,0,.7), 0 10px 20px -10px rgba(0,0,0,.5);
    --btn: #e4e6e3; --btn-fg: #0f1f28; --btn-hover: #ffffff;
    --mark: #9fc4d6;
  }
}
:root[data-theme="dark"] {
  --paper: #14191c; --paper-2: #1a2126; --ink: #0f1f28; --ink-2: #0a161d;
  --text: #e4e6e3; --muted: #9aa6ac; --rule: #2b353b; --amber: #d9a052;
  --on-ink: #eef2f0; --on-ink-muted: #8fa5b1;
  --shadow: 0 30px 60px -20px rgba(0,0,0,.7), 0 10px 20px -10px rgba(0,0,0,.5);
  --btn: #e4e6e3; --btn-fg: #0f1f28; --btn-hover: #ffffff;
  --mark: #9fc4d6;
}

* { box-sizing: border-box; }
html { background: var(--paper); scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--text); font: 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
.skip-link { position: absolute; left: -999px; } .skip-link:focus { left: 12px; top: 12px; background: var(--paper); padding: 8px; z-index: 10; }
.container { max-width: 1080px; margin: 0 auto; padding-inline: 24px; }

h1, h2, h3 { font-family: var(--display); font-weight: 600; letter-spacing: -0.01em; line-height: 1.15; margin: 0; }
h2 { font-size: clamp(1.7rem, 3vw, 2.25rem); margin-bottom: 10px; }
h3 { font-size: 1.2rem; margin-bottom: 8px; }
p { margin: 0 0 1em; }
.section-intro { color: var(--muted); max-width: 60ch; margin-bottom: 36px; font-size: 1.05rem; }

/* Header */
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 12px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-family: var(--display); font-weight: 600; font-size: 1.15rem; }
.brand svg { width: 24px; height: 24px; } .mark-shield { fill: var(--mark); } .mark-bar { fill: var(--paper); }
.site-nav { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; font-size: 15px; }
.site-nav a { color: var(--muted); text-decoration: none; } .site-nav a:hover { color: var(--text); }

/* Buttons */
.btn { display: inline-block; padding: 12px 20px; border-radius: 6px; font-weight: 600; text-decoration: none; border: 1.5px solid transparent; line-height: 1.2; }
.btn-primary { background: var(--btn); color: var(--btn-fg); border-color: var(--btn); }
.btn-primary:hover { background: var(--btn-hover); border-color: var(--btn-hover); }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--rule); }
.btn-secondary:hover { border-color: var(--text); }
.btn-small { padding: 8px 14px; font-size: 14px; }
.btn[aria-disabled="true"] { opacity: .55; pointer-events: none; }
.hero .btn-secondary { color: #f6f3ec; border-color: rgba(255,255,255,.4); } .hero .btn-secondary:hover { border-color: var(--on-ink); }
.hero .btn-primary { background: #f6f3ec; color: #1b3a4b; border-color: #f6f3ec; } .hero .btn-primary:hover { background: #fff; border-color: #fff; }

/* Hero — ink ground, real product on the right */
.hero { background: var(--ink); color: var(--on-ink); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 48px; align-items: center; padding-block: 72px 0; }
.hero h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); font-variation-settings: "SOFT" 50; }
.hero .lede { color: var(--on-ink-muted); font-size: 1.15rem; max-width: 52ch; margin: 22px 0 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.hero-note { font-family: var(--mono); font-size: 13px; color: var(--muted); margin: 0; }
.hero .hero-note { color: var(--on-ink-muted); margin-bottom: 56px; }
.hero-shot { margin: 0; align-self: end; display: flex; justify-content: center; }
.hero-shot img { width: min(380px, 100%); height: auto; border-radius: 12px 12px 0 0; box-shadow: var(--shadow); background: #fff; }

/* Sections */
.section { padding-block: 80px; border-top: 1px solid var(--rule); }
.section-alt { background: var(--paper-2); }
.hero + .section { border-top: 0; }

/* Mechanism: a numbered ladder, not a card grid */
.mechanism-list { list-style: none; margin: 0; padding: 0; counter-reset: step; max-width: 760px; }
.mechanism-list li { counter-increment: step; display: grid; grid-template-columns: 64px 1fr; gap: 18px; padding: 26px 0; border-top: 1px solid var(--rule); }
.mechanism-list li:last-child { border-bottom: 1px solid var(--rule); }
.mechanism-list li > * { grid-column: 2; }
.mechanism-list li::before { grid-column: 1; grid-row: 1 / span 2; content: counter(step, decimal-leading-zero); font-family: var(--display); font-size: 2.2rem; line-height: 1; color: var(--amber); font-variation-settings: "opsz" 144; }
.mechanism-list p { margin: 0; color: var(--muted); max-width: 62ch; }

.callout { max-width: 760px; margin-top: 40px; padding-left: 20px; border-left: 3px solid var(--amber); }
.callout p { color: var(--muted); }

/* Pricing */
.table-wrap { overflow-x: auto; max-width: 760px; }
.pricing-table { width: 100%; border-collapse: collapse; font-size: 16px; }
.pricing-table th, .pricing-table td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.pricing-table thead th { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); border-bottom: 2px solid var(--ink); }
.pricing-table tbody th { font-weight: 500; }
.pricing-table td { color: var(--muted); }
.pricing-table td:last-child { color: var(--text); font-weight: 500; }
.pricing-table tr:last-child td { font-family: var(--mono); font-size: 15px; }
.price-note { color: var(--muted); font-weight: 400; font-size: 13px; }
.principle-box { max-width: 760px; margin-top: 40px; padding: 24px 28px; border: 1px solid var(--rule); border-radius: 8px; background: var(--paper); }
.principle-box h3 { font-size: 1.1rem; } .principle-box p { margin: 0; color: var(--muted); }

/* Trust facts */
.fact-list { list-style: none; padding: 0; margin: 0; max-width: 760px; }
.fact-list li { padding: 18px 0; border-top: 1px solid var(--rule); color: var(--muted); }
.fact-list li:last-child { border-bottom: 1px solid var(--rule); }
.fact-list code, .prose code { font-family: var(--mono); font-size: .92em; background: var(--paper-2); padding: 1px 5px; border-radius: 4px; }

/* FAQ */
.faq-list { max-width: 760px; margin: 0; }
.faq-item { padding: 20px 0; border-top: 1px solid var(--rule); }
.faq-item:last-child { border-bottom: 1px solid var(--rule); }
.faq-item dt { font-weight: 600; margin-bottom: 6px; }
.faq-item dd { margin: 0; color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--rule); font-size: 14px; color: var(--muted); }
.footer-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding-block: 24px; }
.footer-brand { display: inline-flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none; }
.footer-links a { color: var(--muted); margin-right: 16px; }

/* Legal pages */
.legal { max-width: 720px; padding-block: 48px 80px; }
.legal h1 { font-size: 2rem; margin-bottom: 6px; } .legal h2 { font-size: 1.25rem; margin: 34px 0 8px; }
.legal p, .legal li { color: var(--text); } .legal-back { display: inline-block; margin-bottom: 20px; font-size: 15px; color: var(--muted); }
.updated { color: var(--muted); font-size: 15px; } .todo { color: var(--amber); }

@media (max-width: 820px) {
  .header-row { padding-block: 10px; }
  .site-nav { gap: 14px; font-size: 14px; }
  .site-nav .btn-small { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; padding-top: 48px; }
  .hero-note { margin-bottom: 8px; }
  .hero-shot { padding-top: 12px; }
  .section { padding-block: 56px; }
  .mechanism-list li { grid-template-columns: 48px 1fr; gap: 12px; }
  .mechanism-list li::before { font-size: 1.7rem; }
}