/* ======================================================================
   Signet Landing Page
   ====================================================================== */

:root {
  --bg-dark: #0a0a0f;
  --bg-section: #0f0f18;
  --bg-card: #161625;
  --bg-code: #1a1a2e;
  --text-primary: #e8e6e3;
  --text-secondary: #9d9b97;
  --text-muted: #6b6966;
  --accent: #c9a227;
  --accent-dim: #8b7019;
  --accent-glow: rgba(201, 162, 39, 0.15);
  --tier1: #4a9eff;
  --tier2: #c9a227;
  --tier3: #e84855;
  --border: #2a2a3e;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Cascadia Code', monospace;
  --max-width: 1100px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 17px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-code);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ======================================================================
   HERO
   ====================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(201, 162, 39, 0.06) 0%, transparent 60%),
    var(--bg-dark);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.nav-brand:hover { text-decoration: none; }

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); text-decoration: none; }

.nav-github {
  background: var(--bg-card);
  padding: 0.4rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  max-width: 850px;
  margin: 0 auto;
}

.hero-ascii {
  font-family: var(--font-mono);
  font-size: clamp(0.55rem, 1.8vw, 0.85rem);
  color: var(--accent);
  line-height: 1.3;
  margin-bottom: 2.5rem;
  opacity: 0.9;
  white-space: pre;
  user-select: none;
}

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.highlight { color: var(--accent); }

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.8rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
}
.btn-primary:hover {
  background: #ddb42e;
  box-shadow: 0 0 30px rgba(201, 162, 39, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent-dim);
  background: var(--accent-glow);
}

.hero-install code {
  font-size: 0.85rem;
  padding: 0.6rem 1.2rem;
  background: var(--bg-section);
  display: inline-block;
}

.scroll-hint {
  text-align: center;
  padding-bottom: 2rem;
}

.scroll-hint span {
  display: inline-block;
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-dim), transparent);
}

/* ======================================================================
   SECTIONS
   ====================================================================== */

.section {
  padding: 7rem 0;
}

.section-people {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(74, 158, 255, 0.04) 0%, transparent 50%),
    var(--bg-section);
}

.section-builders {
  background: var(--bg-dark);
}

.section-security {
  background:
    radial-gradient(ellipse at 80% 30%, rgba(232, 72, 85, 0.04) 0%, transparent 50%),
    var(--bg-section);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 3rem;
  max-width: 700px;
  letter-spacing: -0.01em;
}

.section h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 4rem;
  margin-bottom: 1.5rem;
}

/* ======================================================================
   FOR EVERYONE
   ====================================================================== */

.problem-solution {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.problem, .solution {
  padding: 2rem;
  border-radius: 12px;
}

.problem {
  background: rgba(232, 72, 85, 0.05);
  border: 1px solid rgba(232, 72, 85, 0.15);
}

.solution {
  background: var(--accent-glow);
  border: 1px solid rgba(201, 162, 39, 0.2);
}

.problem h3 { color: var(--tier3); margin-top: 0; }
.solution h3 { color: var(--accent); margin-top: 0; }

.problem p, .solution p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.problem p:last-child, .solution p:last-child { margin-bottom: 0; }

.tier-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.tier-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color 0.2s, transform 0.2s;
}
.tier-card:hover {
  transform: translateY(-2px);
}

.tier-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.tier-1 .tier-num { color: var(--tier1); }
.tier-2 .tier-num { color: var(--tier2); }
.tier-3 .tier-num { color: var(--tier3); }

.tier-1:hover { border-color: var(--tier1); }
.tier-2:hover { border-color: var(--tier2); }
.tier-3:hover { border-color: var(--tier3); }

.tier-card h4 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.tier-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.tier-example {
  font-family: var(--font-mono);
  font-size: 0.8rem !important;
  color: var(--text-muted) !important;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.analogy {
  margin: 3rem 0;
}

.analogy blockquote {
  border-left: 3px solid var(--accent-dim);
  padding: 1.5rem 2rem;
  color: var(--text-secondary);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.8;
  background: var(--accent-glow);
  border-radius: 0 8px 8px 0;
}

.data-flow {
  margin-top: 3rem;
}

.data-flow h3 { margin-top: 0; }

.flow-diagram {
  text-align: center;
  margin-top: 1.5rem;
}

.flow-step {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.flow-icon {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.1rem;
  padding: 1rem 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.flow-arrow {
  font-size: 1.8rem;
  color: var(--accent);
}

.flow-diagram p {
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto;
}

/* ======================================================================
   FOR BUILDERS
   ====================================================================== */

.architecture {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
  margin-bottom: 3rem;
}

.arch-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.arch-text ol {
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.arch-text li {
  margin-bottom: 0.5rem;
}

.code-block {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  line-height: 1.6;
  white-space: pre;
}

.crate-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.crate-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s;
}
.crate-item:hover { border-color: var(--accent-dim); }

.crate-item code {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  background: none;
  border: none;
  padding: 0;
  display: block;
  margin-bottom: 0.5rem;
}

.crate-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.code-examples {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.code-example h4 {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.kw { color: #c678dd; }
.str { color: #98c379; }
.num { color: #d19a66; }
.comment { color: #5c6370; }

.standards-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2rem;
  font-size: 0.92rem;
}

.standards-table th {
  text-align: left;
  padding: 0.8rem 1rem;
  border-bottom: 2px solid var(--border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.standards-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.standards-table tr:last-child td { border-bottom: none; }

/* ======================================================================
   FOR SECURITY
   ====================================================================== */

.blinddb-intro {
  max-width: 750px;
  margin-bottom: 3rem;
}

.blinddb-intro p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.defense-layers {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 3rem;
}

.defense-layer {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}
.defense-layer:hover { border-color: var(--accent-dim); }

.defense-layer.primary {
  border-color: var(--accent-dim);
  background: linear-gradient(135deg, var(--accent-glow), var(--bg-card));
}

.layer-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 2rem;
  text-align: center;
  padding-top: 0.2rem;
}

.layer-content h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--accent);
  color: var(--bg-dark);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  vertical-align: middle;
  font-weight: 700;
}

.layer-content p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 0.5rem;
}
.layer-content p:last-child { margin-bottom: 0; }

.attacker-view {
  margin-bottom: 3rem;
}

.attacker-view > p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.server-dump {
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
}

.attacker-questions {
  background: rgba(232, 72, 85, 0.05);
  border: 1px solid rgba(232, 72, 85, 0.15);
  border-radius: 10px;
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
}

.attacker-questions h4 {
  color: var(--tier3);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.attacker-questions ul {
  list-style: none;
  padding: 0;
}

.attacker-questions li {
  color: var(--text-secondary);
  padding: 0.3rem 0;
  padding-left: 1.2rem;
  position: relative;
  font-size: 0.92rem;
}

.attacker-questions li::before {
  content: "?";
  position: absolute;
  left: 0;
  color: var(--tier3);
  font-weight: 700;
  font-family: var(--font-mono);
}

.try-it {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.key-derivation {
  margin-bottom: 2rem;
}

.key-derivation p {
  color: var(--text-secondary);
  margin-top: 1rem;
}

.highlight-inline {
  color: var(--tier3);
  font-weight: 600;
}

.tier-keys p {
  color: var(--text-secondary);
  margin-top: 1rem;
}

.rigor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.rigor-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}

.rigor-item h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.rigor-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.cta-final {
  text-align: center;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

.cta-final h3 {
  margin-top: 0;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--text-primary);
}

.cta-final p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* ======================================================================
   FOOTER
   ====================================================================== */

footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 2rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-license {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

/* ======================================================================
   RESPONSIVE
   ====================================================================== */

@media (max-width: 768px) {
  html { font-size: 15px; }

  .problem-solution,
  .architecture,
  .code-examples {
    grid-template-columns: 1fr;
  }

  .tier-cards {
    grid-template-columns: 1fr;
  }

  .crate-grid {
    grid-template-columns: 1fr;
  }

  .rigor-grid {
    grid-template-columns: 1fr;
  }

  .flow-step {
    flex-direction: column;
    gap: 0.75rem;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .defense-layer {
    flex-direction: column;
    gap: 0.75rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 1.5rem;
  }

  .standards-table {
    font-size: 0.82rem;
  }

  .standards-table th,
  .standards-table td {
    padding: 0.6rem 0.5rem;
  }
}