/* ==========================================================================
   PKI Pro — design tokens
   Palette pulled from the actual shield mark (navy + steel + signal mint),
   not a generic default. Mint doubles as the product's own "verified"
   green-tick colour, so the brand palette and the product UI read as one
   family instead of a marketing skin bolted on top.
   ========================================================================== */
:root {
  --ink-navy: #0b1f3a;
  --deep-steel: #12294a;
  --panel: #16345c;
  --trust-blue: #4f8fc4;
  --trust-blue-dim: #3a6c99;
  --signal-mint: #2fbf8f;
  --signal-mint-bright: #3fd9a4;
  --paper: #f5f7fa;
  --paper-dim: #eaeef3;
  --ink: #0f1a2b;
  --ink-soft: #4a5a70;
  --silver-line: rgba(184, 196, 209, 0.35);
  --silver-line-strong: rgba(184, 196, 209, 0.6);

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;

  --max-w: 1160px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.08;
  margin: 0;
  letter-spacing: -0.01em;
}

p { line-height: 1.65; margin: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-mint);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--signal-mint);
  display: inline-block;
}

/* focus visibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--signal-mint);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ==========================================================================
   Header / nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 31, 58, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(184, 196, 209, 0.15);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand img { height: 34px; width: auto; }
.brand-word {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  color: #fff;
  letter-spacing: -0.01em;
}
.brand-word b { color: var(--signal-mint-bright); font-weight: 700; }

.main-nav { display: flex; align-items: center; gap: 34px; }
.main-nav a {
  color: rgba(255,255,255,0.78);
  font-size: 14.5px;
  font-weight: 500;
  transition: color 0.15s ease;
}
.main-nav a:hover { color: #fff; }

.nav-cta {
  padding: 10px 20px;
  border-radius: 100px;
  background: var(--signal-mint);
  color: var(--ink-navy) !important;
  font-weight: 600;
  font-size: 14px;
}
.nav-cta:hover { background: var(--signal-mint-bright); }

.nav-toggle { display: none; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  background: linear-gradient(180deg, var(--ink-navy) 0%, #0d2444 100%);
  position: relative;
  overflow: hidden;
  padding: 88px 0 108px;
}
.hero::before {
  /* faint circuit-grid texture, echoing the shield artwork */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(184,196,209,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184,196,209,0.06) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 70% 60% at 30% 30%, black 40%, transparent 80%);
  pointer-events: none;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  position: relative;
}
.hero h1 {
  font-size: clamp(34px, 4.4vw, 52px);
  color: #fff;
  margin: 18px 0 20px;
}
.hero h1 em {
  font-style: normal;
  color: var(--signal-mint-bright);
}
.hero p.lede {
  color: rgba(255,255,255,0.72);
  font-size: 17.5px;
  max-width: 46ch;
  margin-bottom: 32px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--signal-mint); color: var(--ink-navy); }
.btn-primary:hover { background: var(--signal-mint-bright); }
.btn-ghost { border-color: rgba(255,255,255,0.28); color: #fff; }
.btn-ghost:hover { border-color: rgba(255,255,255,0.6); }

/* --- terminal signature element --- */
.log-card {
  background: #0a1830;
  border: 1px solid rgba(184,196,209,0.18);
  border-radius: var(--radius);
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.55);
  overflow: hidden;
}
.log-card .log-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(184,196,209,0.14);
}
.log-titlebar .dot { width: 9px; height: 9px; border-radius: 50%; }
.dot.r { background: #e5626b; } .dot.y { background: #e0b04b; } .dot.g { background: var(--signal-mint); }
.log-titlebar span.label {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255,255,255,0.45);
}
.log-body {
  padding: 20px 18px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: #b9c6d6;
  min-height: 168px;
}
.log-line { margin-bottom: 9px; white-space: pre-wrap; opacity: 0; animation: logIn 0.4s ease forwards; }
.log-line .ok { color: var(--signal-mint-bright); }
.log-line .tag { color: var(--trust-blue); }
@keyframes logIn { to { opacity: 1; } }

.stamp-row {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px dashed rgba(184,196,209,0.22);
}
.stamp-row .stamp-text { font-family: var(--font-mono); font-size: 12.5px; color: rgba(255,255,255,0.65); }
.stamp-row svg { width: 30px; height: 30px; flex-shrink: 0; }
.stamp-check {
  stroke: var(--signal-mint-bright);
  stroke-width: 9;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 60;
  stroke-dashoffset: 60;
  animation: draw 0.6s ease 2.1s forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ==========================================================================
   Compat strip
   ========================================================================== */
.compat {
  background: var(--panel);
  padding: 26px 0;
  border-bottom: 1px solid rgba(184,196,209,0.14);
}
.compat .wrap {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
  justify-content: space-between;
}
.compat-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}
.compat-items { display: flex; gap: 26px; flex-wrap: wrap; }
.compat-items span {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: rgba(255,255,255,0.72);
  padding: 6px 12px;
  border: 1px solid rgba(184,196,209,0.2);
  border-radius: 8px;
}

/* ==========================================================================
   Section shell
   ========================================================================== */
section.block { padding: 96px 0; }
.block-head { max-width: 640px; margin-bottom: 52px; }
.block-head h2 { font-size: clamp(28px, 3vw, 38px); margin: 16px 0 14px; color: var(--ink-navy); }
.block-head p { color: var(--ink-soft); font-size: 16.5px; }
.block.on-dark { background: var(--ink-navy); }
.block.on-dark .block-head h2 { color: #fff; }
.block.on-dark .block-head p { color: rgba(255,255,255,0.65); }

/* ==========================================================================
   Feature grid (SecureSign Pro)
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--silver-line);
  border: 1px solid var(--silver-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.feature-card {
  background: #fff;
  padding: 32px 28px;
}
.feature-card .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal-mint);
  margin-bottom: 18px;
  display: block;
}
.feature-card h3 { font-size: 18.5px; margin-bottom: 10px; color: var(--ink-navy); }
.feature-card p { font-size: 14.5px; color: var(--ink-soft); }

/* ==========================================================================
   How it works
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  counter-reset: step;
}
.step { position: relative; padding-top: 8px; }
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  display: block;
  margin-bottom: 14px;
}
.step h3 { color: #fff; font-size: 19px; margin-bottom: 10px; }
.step p { color: rgba(255,255,255,0.62); font-size: 14.5px; }
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 6px; right: -15px;
  width: 1px; height: 74px;
  background: rgba(184,196,209,0.18);
}
@media (max-width: 860px) { .step:not(:last-child)::after { display: none; } }

/* ==========================================================================
   Use cases
   ========================================================================== */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.usecase-card {
  background: #fff;
  border: 1px solid var(--silver-line-strong);
  border-radius: var(--radius);
  padding: 26px 22px;
}
.usecase-card .icon-badge {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: rgba(47,191,143,0.12);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.usecase-card .icon-badge svg { width: 20px; height: 20px; stroke: var(--signal-mint); }
.usecase-card h3 { font-size: 16.5px; color: var(--ink-navy); margin-bottom: 8px; }
.usecase-card p { font-size: 13.8px; color: var(--ink-soft); }

/* ==========================================================================
   Blog preview
   ========================================================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.blog-card {
  border: 1px solid var(--silver-line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.blog-card:hover { transform: translateY(-3px); box-shadow: 0 20px 34px -22px rgba(11,31,58,0.35); }
.blog-card .thumb {
  height: 132px;
  background: linear-gradient(135deg, var(--ink-navy), var(--panel));
  position: relative;
}
.blog-card .thumb::after {
  content: "";
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
                     linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 18px 18px;
}
.blog-card .body { padding: 22px 22px 24px; }
.blog-card .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--signal-mint);
}
.blog-card h3 { font-size: 16.5px; margin: 10px 0 8px; color: var(--ink-navy); }
.blog-card p { font-size: 13.8px; color: var(--ink-soft); }
.blog-card .meta { margin-top: 14px; font-family: var(--font-mono); font-size: 12px; color: #9aa8b8; }

.blog-cta { text-align: center; margin-top: 44px; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { max-width: 800px; }
.faq-item {
  border-bottom: 1px solid var(--silver-line-strong);
  padding: 20px 0;
}
.faq-item summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16.5px;
  color: var(--ink-navy);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--signal-mint);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p {
  margin-top: 14px;
  color: var(--ink-soft);
  font-size: 14.8px;
  max-width: 68ch;
}

/* ==========================================================================
   Demo / contact
   ========================================================================== */
.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 14px; margin-top: 6px; }
.contact-info a {
  display: flex; align-items: center; gap: 12px;
  color: #fff; font-family: var(--font-mono); font-size: 15px;
}
.contact-info svg { width: 18px; height: 18px; stroke: var(--signal-mint); flex-shrink: 0; }

.demo-form {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(184,196,209,0.18);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.demo-form label {
  display: flex; flex-direction: column; gap: 7px;
  font-size: 13px; color: rgba(255,255,255,0.6);
  font-family: var(--font-mono);
}
.demo-form input, .demo-form textarea {
  font-family: var(--font-body);
  font-size: 14.5px;
  padding: 11px 13px;
  border-radius: 8px;
  border: 1px solid rgba(184,196,209,0.3);
  background: rgba(255,255,255,0.05);
  color: #fff;
  resize: vertical;
}
.demo-form input::placeholder, .demo-form textarea::placeholder { color: rgba(255,255,255,0.35); }
.demo-form input:focus, .demo-form textarea:focus { outline: none; border-color: var(--signal-mint); }
.demo-form button { margin-top: 4px; border: none; }
.form-note { font-size: 12.5px; color: rgba(255,255,255,0.45); margin-top: -4px; }

@media (max-width: 860px) {
  .demo-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   CTA band
   ========================================================================== */
.cta-band {
  background: linear-gradient(120deg, var(--ink-navy), var(--panel));
  padding: 74px 0;
  text-align: center;
}
.cta-band h2 { color: #fff; font-size: clamp(26px, 3vw, 34px); margin-bottom: 18px; }
.cta-band p { color: rgba(255,255,255,0.68); max-width: 50ch; margin: 0 auto 30px; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { background: #081527; padding: 56px 0 28px; }
.footer-top {
  display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap;
  padding-bottom: 40px; border-bottom: 1px solid rgba(184,196,209,0.14);
}
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p { color: rgba(255,255,255,0.5); font-size: 13.5px; max-width: 32ch; }
.footer-cols { display: flex; gap: 64px; }
.footer-col h4 { color: #fff; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 16px; opacity: 0.8; }
.footer-col a { display: block; color: rgba(255,255,255,0.55); font-size: 14px; margin-bottom: 11px; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  padding-top: 24px; font-size: 12.5px; color: rgba(255,255,255,0.4);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Scroll reveal
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; gap: 36px; }
  .usecase-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .main-nav { display: none; }
  .nav-toggle {
    display: inline-flex; background: none; border: none; color: #fff;
    font-size: 26px; cursor: pointer;
  }
  .main-nav.open {
    display: flex; position: absolute; top: 72px; left: 0; right: 0;
    background: var(--ink-navy); flex-direction: column; padding: 20px 28px 28px; gap: 18px;
    border-bottom: 1px solid rgba(184,196,209,0.15);
  }
  .feature-grid { grid-template-columns: 1fr; }
  .usecase-grid { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
  .footer-cols { gap: 40px; }
}