/* circlekey.io — the only stylesheet.
   No webfonts, no imports, no third-party anything. */

/* ---------- tokens ---------- */
:root {
  --navy: #01122D;
  --navy-2: #0A1F42;
  --navy-3: #132C58;
  --cyan: #35D6F0;
  --accent: #1B7BFF;
  --accent-ink: #ffffff;
  --line: #D8DEE8;
  --dim: #5B6A80;
  --ink: #16233A;
  --bg: #F2F5F9;
  --card: #FFFFFF;
  --ok: #0A7A3D;
  --bad: #B42318;
  --warn: #8A5A00;
  --warn-bg: #FFF9EC;
  --warn-line: #E6D2A2;
  --code-bg: rgba(90, 110, 140, .09);

  --on-navy: #DBE6F5;
  --on-navy-dim: #8FA5C4;
  --on-navy-line: #29456F;

  --shell: 1120px;
  --prose: 68ch;
  --radius: 12px;

  --fs-hero: clamp(32px, 5vw, 48px);
  --fs-h2: clamp(26px, 3.4vw, 32px);
  --fs-h3: 22px;
  --fs-lead: 18px;
  --fs-body: 16px;
  --fs-small: 13.5px;
  --fs-chip: 11.5px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --navy: #050D1B;
    --navy-2: #0F2038;
    --navy-3: #17304F;
    --accent: #4E9BFF;
    --accent-ink: #04122A;
    --line: #1F3557;
    --dim: #93A9C7;
    --ink: #DDE7F5;
    --bg: #0A1524;
    --card: #0F2038;
    --ok: #3FBE77;
    --bad: #F1786A;
    --warn: #E0A94A;
    --warn-bg: #1C1B0F;
    --warn-line: #4A3E1C;
    --code-bg: rgba(140, 170, 210, .10);
    --on-navy: #DDE7F5;
    --on-navy-dim: #93A9C7;
    --on-navy-line: #1F3557;
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: var(--fs-body)/1.65 system-ui, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-weight: 600; line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: var(--fs-hero); line-height: 1.1; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); letter-spacing: 0; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

code, kbd, pre { font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace; }
code { font-size: .92em; background: var(--code-bg); border-radius: 5px; padding: .12em .38em; }
pre { margin: 0; background: none; }
pre code { background: none; padding: 0; font-size: 13px; line-height: 1.7; }

hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 50;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 18px; border-radius: 0 0 8px 0; text-decoration: none;
}
.skip:focus { left: 0; }

/* ---------- layout ---------- */
.shell { max-width: var(--shell); margin: 0 auto; padding-inline: 24px; }
@media (max-width: 640px) { .shell { padding-inline: 16px; } }

.band { padding-block: 96px; }
.band + .band { padding-top: 0; }
@media (max-width: 720px) { .band { padding-block: 56px; } }

.band-navy {
  background: var(--navy);
  color: var(--on-navy);
  padding-block: 72px;
  border-top: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--navy) 0%, var(--accent) 55%, var(--cyan) 100%) 1;
}
.band-navy + .band { padding-top: 96px; }
.band-navy h2, .band-navy h3 { color: #fff; }
.band-navy a { color: var(--cyan); }
.band-alt { background: var(--card); border-block: 1px solid var(--line); }

.prose { max-width: var(--prose); }
.center { margin-inline: auto; text-align: center; }
.center .prose { margin-inline: auto; }

.lead { font-size: var(--fs-lead); line-height: 1.6; color: var(--dim); }
.band-navy .lead { color: var(--on-navy-dim); }

.section-head { margin-bottom: 40px; }
.small { font-size: var(--fs-small); }
.dim { color: var(--dim); }

/* ---------- header ---------- */
.site-header {
  background: var(--navy);
  color: var(--on-navy);
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--on-navy-line);
}
.site-header .shell {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #fff; margin-right: auto; }
.brand svg { width: 30px; height: 30px; display: block; flex: none; }
.brand .wordmark { font-size: 19px; font-weight: 600; letter-spacing: -.015em; }
.brand .wordmark b { font-weight: 600; color: var(--cyan); }
.brand .tagline {
  display: block; font-size: 8.5px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--on-navy-dim); font-weight: 500; margin-top: 1px;
}

.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  color: var(--on-navy); text-decoration: none; font-size: 14.5px;
  padding: 8px 12px; border-radius: 8px;
}
.site-nav a:hover { background: var(--navy-3); }
.site-nav a[aria-current="page"] { color: #fff; background: var(--navy-2); }
.site-nav .btn { margin-left: 8px; }

/* No disclosure toggle: the nav is CSS-only so it stays reachable with
   scripts blocked — which is the claim the footer makes. */
@media (max-width: 860px) {
  .brand { margin-right: 0; }
  .site-header { position: static; }
  .site-header .shell { flex-wrap: wrap; padding-block: 10px; gap: 8px; }
  .site-nav { flex-basis: 100%; flex-wrap: wrap; gap: 2px; }
  .site-nav a { padding: 7px 10px; font-size: 14px; }
  .site-nav .btn { margin-left: 0; flex: 1 1 100%; text-align: center; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 9px;
  font: inherit; font-size: 15px; font-weight: 500; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-secondary { border-color: var(--line); color: var(--ink); background: var(--card); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.band-navy .btn-secondary, .site-header .btn-secondary {
  background: transparent; border-color: var(--on-navy-line); color: var(--on-navy);
}
.band-navy .btn-secondary:hover, .site-header .btn-secondary:hover { border-color: var(--cyan); color: var(--cyan); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 28px; }
.center .actions { justify-content: center; }

/* ---------- cards & grids ---------- */
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--dim); font-size: 15px; }
.band-navy .card { background: var(--navy-2); border-color: var(--on-navy-line); }
.band-navy .card p { color: var(--on-navy-dim); }

.card-link { text-decoration: none; color: inherit; display: block; }
.card-link:hover { border-color: var(--accent); }
.card-link .go { color: var(--accent); font-size: 14.5px; font-weight: 500; }

.steps { counter-reset: step; }
.steps .card::before {
  counter-increment: step; content: counter(step);
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: var(--accent-ink);
  font-size: 14px; font-weight: 600; margin-bottom: 12px;
}

/* ---------- chips ---------- */
.chip {
  display: inline-block; font-family: ui-monospace, Consolas, monospace;
  font-size: var(--fs-chip); letter-spacing: .04em;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 2px 8px; color: var(--dim); background: var(--bg);
  text-decoration: none; vertical-align: 2px; white-space: nowrap;
}
a.chip:hover { border-color: var(--accent); color: var(--accent); }
.band-navy .chip { background: transparent; border-color: var(--on-navy-line); color: var(--on-navy-dim); }
.card .chip { background: var(--bg); }

.eyebrow {
  font-size: var(--fs-chip); letter-spacing: .12em; text-transform: uppercase;
  font-weight: 600; color: var(--accent); margin: 0 0 12px;
}

/* ---------- hero ---------- */
.hero { background: var(--navy); color: var(--on-navy); padding-block: 72px 80px; }
.hero h1 { color: #fff; max-width: 15ch; }
.hero .lead { color: var(--on-navy-dim); max-width: 56ch; font-size: var(--fs-lead); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { max-width: none; }
}
.hero-simple { padding-block: 56px 60px; }
.hero-simple h1 { max-width: 22ch; }
.hero-simple .lead { max-width: 62ch; }

.hero-meta {
  margin-top: 22px; font-size: var(--fs-small); color: var(--on-navy-dim);
  display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center;
}
.hero-meta code { background: rgba(255,255,255,.07); color: var(--on-navy); }
.hero-meta a { color: var(--on-navy-dim); }

.hero-figure { margin: 0; }
.hero-figure svg { width: 100%; height: auto; display: block; }
.hero-figure figcaption {
  margin-top: 14px; font-size: var(--fs-small); color: var(--on-navy-dim); line-height: 1.55;
}

/* ---------- code block ---------- */
.codeblock {
  position: relative; background: var(--navy); color: #dfe9f8;
  border-radius: var(--radius); border: 1px solid var(--on-navy-line);
  padding: 20px 22px; overflow-x: auto;
}
.codeblock .cm { color: #7d97bd; }
.codeblock .kw { color: #6fb2ff; }
.codeblock .st { color: #79d3a5; }
.codeblock .fn { color: #ffd479; }
.copy-btn {
  position: absolute; top: 10px; right: 10px;
  background: rgba(255,255,255,.07); border: 1px solid var(--on-navy-line);
  color: var(--on-navy-dim); border-radius: 7px; padding: 4px 10px;
  font: inherit; font-size: 12px; cursor: pointer;
}
.copy-btn:hover { color: #fff; border-color: var(--cyan); }

/* ---------- see / never-see split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } }
.split .card { padding: 0; overflow: hidden; }
.split h3 { display: flex; align-items: center; gap: 9px; margin: 0; padding: 16px 20px; font-size: 16px; border-bottom: 1px solid var(--line); }
.split .icon { font-size: 13px; font-weight: 700; }
.split .can .icon { color: var(--warn); }
.split .cannot .icon { color: var(--ok); }
.split ul { list-style: none; margin: 0; padding: 6px 20px 18px; }
.split li { padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.split li:last-child { border-bottom: 0; }
.split li code { font-size: 12.5px; }

/* ---------- pricing ---------- */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.pricing {
  width: 100%; min-width: 680px; border-collapse: collapse;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
}
.pricing th, .pricing td {
  padding: 13px 16px; text-align: left; font-size: 14.5px;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
.pricing thead th { border-bottom: 2px solid var(--line); vertical-align: bottom; }
.pricing tbody tr:last-child td, .pricing tbody tr:last-child th { border-bottom: 0; }
.pricing th[scope="row"] { font-weight: 500; color: var(--dim); width: 24%; }
.pricing .tier-name { font-size: 17px; font-weight: 600; color: var(--ink); display: block; }
.pricing .tier-price { font-size: 30px; font-weight: 600; letter-spacing: -.02em; display: block; margin-top: 4px; }
.pricing .tier-price small { font-size: 14px; font-weight: 400; color: var(--dim); letter-spacing: 0; }
.pricing .featured { background: var(--bg); }
.pricing td.yes { color: var(--ok); font-weight: 600; }

.note {
  border-left: 3px solid var(--accent); padding: 4px 0 4px 16px;
  color: var(--dim); font-size: 15px; margin: 24px 0;
}

/* ---------- FAQ / definition lists ---------- */
.faq dt { font-weight: 600; margin-top: 24px; }
.faq dd { margin: 6px 0 0; color: var(--dim); }
.faq dt:first-child { margin-top: 0; }

.tick { list-style: none; padding: 0; margin: 0; }
.tick li { padding-left: 26px; position: relative; margin-bottom: 12px; }
.tick li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--ok); font-weight: 700;
}
.tick.cross li::before { content: "✕"; color: var(--bad); }

/* a tick list living inside a split card keeps the card's inset padding */
.split .tick { padding: 16px 20px 20px; }
.split .tick li { border-bottom: 0; padding: 0 0 0 26px; margin-bottom: 11px; }
.split .tick li:last-child { margin-bottom: 0; }

/* ---------- disclaimer ---------- */
.disclaimer {
  border: 1px solid var(--warn-line); background: var(--warn-bg);
  border-radius: var(--radius); padding: 20px 22px; margin-block: 0 64px;
}
.disclaimer h2, .disclaimer h3 {
  font-size: var(--fs-chip); letter-spacing: .12em; text-transform: uppercase;
  color: var(--warn); margin: 0 0 8px;
}
.disclaimer p { font-size: 14.5px; color: var(--ink); max-width: var(--prose); }

/* ---------- footer ---------- */
.site-footer {
  background: var(--navy); color: var(--on-navy-dim);
  padding-block: 48px 36px; font-size: var(--fs-small);
  border-top: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--navy) 0%, var(--accent) 55%, var(--cyan) 100%) 1;
}
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
@media (max-width: 780px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.site-footer h2 {
  font-size: var(--fs-chip); letter-spacing: .12em; text-transform: uppercase;
  color: var(--on-navy); margin: 0 0 12px;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: var(--on-navy-dim); text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.footer-brand svg { width: 34px; height: 34px; display: block; margin-bottom: 12px; }
.footer-bottom {
  margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--on-navy-line);
  display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between;
}
.no-tracking { color: var(--on-navy-dim); }

/* ---------- hero figure ---------- */
.hero-figure .link { stroke: var(--accent); stroke-width: 2; opacity: .8; }
.hero-figure .dot { fill: var(--navy-2); stroke: var(--accent); stroke-width: 2; }
.hero-figure .person { fill: var(--cyan); }
.hero-figure .env { fill: var(--navy-2); stroke: var(--accent); stroke-width: 1.5; }
.hero-figure .env-flap { fill: none; stroke: var(--cyan); stroke-width: 1.5; stroke-linejoin: round; }
.hero-figure .cut { stroke: var(--bad); stroke-width: 2.5; stroke-dasharray: 6 6; stroke-linecap: round; }
.hero-figure .cut-x { stroke: var(--bad); stroke-width: 2.5; stroke-linecap: round; }
.hero-figure .keyglyph { fill: #fff; stroke: #fff; }
.hero-figure .label {
  fill: var(--on-navy-dim); font-family: ui-monospace, Consolas, monospace;
  font-size: 11px; letter-spacing: .16em; text-anchor: middle;
}

/* ---------- hero animation ---------- */
.vault-ring { animation: ck-pulse 12s ease-in-out infinite; transform-origin: 300px 150px; }
.member-new { animation: ck-join 12s ease-in-out infinite; }
.member-gone { animation: ck-leave 12s ease-in-out infinite; }
.link-gone { animation: ck-cut 12s ease-in-out infinite; }
.link-fresh { animation: ck-reseal 12s ease-in-out infinite; }
.link-revoked { animation: ck-revoke 12s ease-in-out infinite; }

@keyframes ck-revoke {
  0%, 44% { opacity: 1; }
  54%, 100% { opacity: 0; }
}

@keyframes ck-pulse {
  0%, 44% { transform: scale(1); }
  50% { transform: scale(1.045); }
  56%, 100% { transform: scale(1); }
}
@keyframes ck-join {
  0%, 8% { opacity: 0; }
  18%, 100% { opacity: 1; }
}
@keyframes ck-leave {
  0%, 42% { opacity: 1; transform: translate(0, 0); }
  56%, 100% { opacity: .45; transform: translate(26px, 46px); }
}
@keyframes ck-cut {
  0%, 42% { opacity: 0; }
  58%, 100% { opacity: 1; }
}
@keyframes ck-reseal {
  0%, 50% { opacity: 1; }
  54% { opacity: .15; }
  62%, 100% { opacity: 1; }
}

/* Static state == the final frame: the departed member has drifted off,
   their link is gone, and the severed link is visible. The still has to
   carry the whole argument on its own. */
@media (prefers-reduced-motion: reduce) {
  .vault-ring, .member-new, .member-gone,
  .link-gone, .link-fresh, .link-revoked { animation: none; }
  .member-gone { opacity: .45; transform: translate(26px, 46px); }
  .link-revoked { opacity: 0; }
}

/* ---------- print ---------- */
@media print {
  .site-header, .site-footer, .copy-btn, .hero-figure { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .band, .hero { padding-block: 12pt; background: #fff; color: #000; }
  .hero h1, .band-navy h2, .band-navy h3 { color: #000; }
  a::after { content: " (" attr(href) ")"; font-size: 9pt; color: #444; }
}