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

:root {
  --bg:       #0d1b2a;
  --surface:  #112234;
  --surface2: #162e45;
  --border:   rgba(148,197,232,0.12);
  --text:     #e8f0f8;
  --muted:    rgba(232,240,248,0.52);
  --accent:   #38bdf8;
  --accent2:  #7dd3fc;
  --green:    #4ade80;
  --sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:     'JetBrains Mono', 'Fira Code', monospace;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent2); }

/* ── Nav ──────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: rgba(13,27,42,0.92);
  backdrop-filter: blur(12px);
  padding: 0 48px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--text);
  text-transform: uppercase;
}
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }
.nav-links .btn-nav {
  background: var(--accent);
  color: #0d1b2a;
  padding: 6px 18px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-radius: 3px;
  transition: background 0.15s;
}
.nav-links .btn-nav:hover { background: var(--accent2); color: #0d1b2a; }

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
  padding: 120px 48px 100px;
  max-width: 1100px;
  margin: 0 auto;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 28px;
}
.hero-title .accent { color: var(--accent); }
.hero-sub {
  font-size: 17px;
  color: var(--muted);
  max-width: 580px;
  line-height: 1.75;
  margin-bottom: 48px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

/* ── Buttons ──────────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #0d1b2a;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 13px 32px;
  border-radius: 3px;
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  text-decoration: none;
}
.btn-primary:hover { background: var(--accent2); color: #0d1b2a; transform: translateY(-1px); }
.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--text);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 13px 32px;
  border-radius: 3px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, transform 0.1s;
  text-decoration: none;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* ── Features strip ───────────────────────────────────────────── */
.features {
  border-top: 1px solid var(--border);
  padding: 80px 48px;
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 48px;
}
.feature-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.feature-body { font-size: 14px; color: var(--muted); line-height: 1.7; }

/* ── Section wrapper ──────────────────────────────────────────── */
.section {
  border-top: 1px solid var(--border);
  padding: 80px 48px;
  max-width: 1100px;
  margin: 0 auto;
}
.section-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 16px;
}
.section-lead { font-size: 16px; color: var(--muted); max-width: 600px; line-height: 1.75; margin-bottom: 48px; }

/* ── Footer ───────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
}
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

/* ── Protocol page ────────────────────────────────────────────── */
.prose { max-width: 720px; }
.prose h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 48px 0 14px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}
.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.prose p { font-size: 15px; color: var(--muted); line-height: 1.8; margin-bottom: 16px; }
.prose ul { margin: 0 0 16px 20px; }
.prose li { font-size: 15px; color: var(--muted); line-height: 1.8; margin-bottom: 6px; }
.prose strong { color: var(--text); font-weight: 600; }

.download-block {
  margin-top: 48px;
  padding: 28px 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.download-block-copy h3 { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.download-block-copy p { font-size: 13px; color: var(--muted); }

/* ── Terms page ───────────────────────────────────────────────── */
.terms-section { margin-bottom: 40px; }
.terms-section h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  font-family: var(--mono);
  letter-spacing: 0.06em;
}
.terms-section p,
.terms-section li {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 8px;
}
.terms-section ul { margin-left: 20px; }
.terms-notice {
  padding: 16px 20px;
  background: var(--surface);
  border-left: 3px solid var(--accent);
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 40px;
  border-radius: 0 4px 4px 0;
}

/* ── Signup form ──────────────────────────────────────────────── */
.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 48px;
  max-width: 560px;
}
.form-row { margin-bottom: 22px; }
.form-label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.form-input,
.form-select {
  display: block;
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  padding: 11px 14px;
  outline: none;
  transition: border-color 0.15s;
  appearance: none;
  -webkit-appearance: none;
}
.form-input:focus,
.form-select:focus { border-color: var(--accent); }
.form-select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2338bdf8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
.form-checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 28px;
}
.form-checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  accent-color: var(--accent);
  flex-shrink: 0;
  cursor: pointer;
}
.form-checkbox-row label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
  cursor: pointer;
}
.form-checkbox-row label a { color: var(--accent); }
.form-error { font-size: 12px; color: #f87171; margin-top: 6px; }

/* ── Confirmation ─────────────────────────────────────────────── */
.confirmation {
  text-align: center;
  padding: 64px 48px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  max-width: 560px;
}
.confirmation-icon {
  font-size: 40px;
  margin-bottom: 24px;
  color: var(--green);
}
.confirmation h2 {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 14px;
}
.confirmation p { font-size: 14px; color: var(--muted); line-height: 1.7; }

/* ── Page shell ───────────────────────────────────────────────── */
.page-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 72px 48px 80px;
}

@media (max-width: 640px) {
  .nav { padding: 0 20px; }
  .hero { padding: 72px 20px 64px; }
  .features { padding: 48px 20px; }
  .section { padding: 56px 20px; }
  .page-inner { padding: 48px 20px 64px; }
  .form-card { padding: 28px 20px; }
  footer { padding: 24px 20px; flex-direction: column; gap: 8px; text-align: center; }
}