/* ═══════════════════════════════════════════════════════════════
   site.css  |  PaperThePDF  |  Shared site-wide styles
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bg:        #f5f4f0;
  --surface:   #ffffff;
  --border:    #ddd9d0;
  --accent:    #2d6a4f;
  --accent-h:  #1b4332;
  --accent-lt: #d8f3dc;
  --text:      #1a1a1a;
  --muted:     #6b7280;
  --radius:    12px;
  --shadow:    0 2px 16px rgba(0,0,0,.08);
  --nav-h:     56px;
}

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

/* ── Typography base ────────────────────────────────────────────── */
.site-body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Site Navigation ────────────────────────────────────────────── */
.site-nav {
  width: 100%;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -.4px;
  flex-shrink: 0;
}
.nav-logo .lo-the { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-link {
  padding: 6px 12px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: .875rem;
  font-weight: 500;
  transition: color .15s, background .15s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--accent); background: var(--accent-lt); }
.nav-link.active { color: var(--accent); font-weight: 700; }
.nav-cta {
  margin-left: 10px;
  padding: 8px 20px;
  background: var(--accent);
  color: #fff !important;
  border-radius: 99px;
  font-size: .85rem;
  font-weight: 700;
  text-decoration: none;
  transition: background .15s, transform .12s;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--accent-h); transform: translateY(-1px); }

/* ── Site Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 52px 24px 28px;
  margin-top: auto;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 10px;
  letter-spacing: -.3px;
}
.footer-brand-name .lo-the { color: var(--accent); }
.footer-tagline {
  color: var(--muted);
  font-size: .875rem;
  line-height: 1.65;
  max-width: 260px;
  margin-bottom: 16px;
}
.footer-badge {
  display: inline-block;
  background: var(--accent-lt);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  letter-spacing: .04em;
}
.footer-col h4 {
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.footer-col a {
  display: block;
  color: var(--text);
  text-decoration: none;
  font-size: .875rem;
  margin-bottom: 9px;
  transition: color .15s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: .78rem;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom a { color: var(--muted); text-decoration: none; }
.footer-bottom a:hover { color: var(--accent); }
.footer-legal { display: flex; gap: 16px; }

/* ── Page Hero ──────────────────────────────────────────────────── */
.page-hero {
  background: linear-gradient(135deg, var(--accent-h) 0%, var(--accent) 60%, #40916c 100%);
  color: #fff;
  padding: 76px 24px 64px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,.18);
  color: #fff;
  padding: 4px 16px;
  border-radius: 99px;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -.5px;
  line-height: 1.2;
  max-width: 720px;
  margin: 0 auto 18px;
}
.page-hero p {
  font-size: 1.08rem;
  opacity: .88;
  max-width: 580px;
  margin: 0 auto 30px;
  line-height: 1.65;
}
.hero-cta-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-cta {
  display: inline-block;
  background: #fff;
  color: var(--accent-h);
  padding: 12px 28px;
  border-radius: 99px;
  font-weight: 700;
  font-size: .93rem;
  text-decoration: none;
  transition: opacity .15s, transform .12s;
}
.hero-cta:hover { opacity: .92; transform: translateY(-1px); }
.hero-cta-outline {
  display: inline-block;
  background: transparent;
  color: #fff;
  padding: 12px 28px;
  border-radius: 99px;
  font-weight: 600;
  font-size: .93rem;
  text-decoration: none;
  border: 2px solid rgba(255,255,255,.5);
  transition: border-color .15s, background .15s;
}
.hero-cta-outline:hover { border-color: #fff; background: rgba(255,255,255,.1); }

/* ── Content Sections ───────────────────────────────────────────── */
.site-section { padding: 72px 24px; }
.site-section.alt { background: var(--surface); }
.site-section.dark {
  background: linear-gradient(135deg, var(--accent-h), var(--accent));
  color: #fff;
}
.section-inner { max-width: 1060px; margin: 0 auto; }
.section-label {
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.site-section.dark .section-label { color: rgba(255,255,255,.7); }
.section-title {
  font-size: clamp(1.55rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -.4px;
  line-height: 1.2;
  margin-bottom: 14px;
}
.section-subtitle {
  font-size: 1.02rem;
  color: var(--muted);
  line-height: 1.65;
  max-width: 620px;
  margin-bottom: 44px;
}
.site-section.dark .section-subtitle { color: rgba(255,255,255,.78); }

/* ── Feature Grid ───────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  transition: transform .18s, box-shadow .18s;
}
.feature-card:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,.11); }
.feature-icon { font-size: 1.9rem; margin-bottom: 14px; display: block; }
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: .875rem; color: var(--muted); line-height: 1.65; }

/* ── How It Works Steps ─────────────────────────────────────────── */
.steps-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.step { display: flex; gap: 18px; align-items: flex-start; }
.step-num {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1rem;
  flex-shrink: 0;
}
.site-section.dark .step-num { background: rgba(255,255,255,.25); }
.step-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.step-body p { font-size: .875rem; color: var(--muted); line-height: 1.65; }
.site-section.dark .step-body p { color: rgba(255,255,255,.75); }
.site-section.dark .step-body h3 { color: #fff; }

/* ── Use-case Cards ─────────────────────────────────────────────── */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.usecase-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}
.usecase-card .uc-icon { font-size: 2rem; margin-bottom: 12px; display: block; }
.usecase-card h3 { font-size: .95rem; font-weight: 700; margin-bottom: 8px; }
.usecase-card p { font-size: .855rem; color: var(--muted); line-height: 1.6; }

/* ── Stats Row ──────────────────────────────────────────────────── */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 20px;
  margin: 8px 0 44px;
}
.stat-card {
  text-align: center;
  padding: 26px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.stat-number { font-size: 2.3rem; font-weight: 800; color: var(--accent); line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: .83rem; color: var(--muted); }

/* ── Privacy Promise ────────────────────────────────────────────── */
.promise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}
.promise-card {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.promise-card .pc-icon { font-size: 1.8rem; margin-bottom: 10px; display: block; }
.promise-card h4 { font-size: .93rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.promise-card p { font-size: .83rem; color: rgba(255,255,255,.75); line-height: 1.55; }

/* ── CTA Block ──────────────────────────────────────────────────── */
.cta-block {
  background: linear-gradient(135deg, var(--accent-h), var(--accent));
  color: #fff;
  padding: 72px 24px;
  text-align: center;
}
.cta-block h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; margin-bottom: 14px; }
.cta-block p { font-size: 1.05rem; opacity: .85; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ── FAQ Accordion ──────────────────────────────────────────────── */
.faq-group { margin-bottom: 36px; }
.faq-group-title {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  padding-left: 4px;
}
details.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 8px;
}
summary.faq-q {
  padding: 18px 22px;
  font-weight: 600;
  font-size: .93rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
  transition: background .15s;
}
summary.faq-q:hover { background: var(--bg); }
summary.faq-q::-webkit-details-marker { display: none; }
summary.faq-q::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 300;
  flex-shrink: 0;
  transition: transform .2s;
}
details[open] summary.faq-q::after { content: '−'; }
.faq-a {
  padding: 4px 22px 20px;
  color: var(--muted);
  font-size: .885rem;
  line-height: 1.75;
}
.faq-a a { color: var(--accent); }
.faq-a ul { margin: 8px 0 0 18px; }
.faq-a li { margin-bottom: 4px; }

/* ── Guide Layout ───────────────────────────────────────────────── */
.guide-wrap { max-width: 1060px; margin: 0 auto; padding: 48px 24px 80px; }
.guide-layout { display: grid; grid-template-columns: 210px 1fr; gap: 48px; align-items: start; }
.guide-toc {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.guide-toc h3 {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.guide-toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: .845rem;
  padding: 5px 8px;
  border-radius: 6px;
  margin-bottom: 2px;
  transition: color .15s, background .15s;
}
.guide-toc a:hover { color: var(--accent); background: var(--accent-lt); }
.guide-content section { margin-bottom: 60px; scroll-margin-top: calc(var(--nav-h) + 24px); }
.guide-content h2 {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}
.guide-content h3 { font-size: 1.05rem; font-weight: 700; margin: 22px 0 8px; }
.guide-content p { font-size: .89rem; color: var(--muted); line-height: 1.78; margin-bottom: 12px; }
.guide-content ul, .guide-content ol {
  margin: 0 0 14px 20px;
  color: var(--muted);
  font-size: .89rem;
  line-height: 1.78;
}
.guide-content li { margin-bottom: 4px; }
.guide-note {
  background: var(--accent-lt);
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: .875rem;
  color: var(--accent-h);
  line-height: 1.6;
}
.guide-tip {
  background: #fef9c3;
  border-left: 4px solid #f59e0b;
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: .875rem;
  color: #78350f;
  line-height: 1.6;
}
.guide-table { width: 100%; border-collapse: collapse; font-size: .875rem; margin: 16px 0 24px; }
.guide-table th {
  background: var(--bg); padding: 10px 14px; text-align: left;
  font-weight: 600; color: var(--text); border-bottom: 2px solid var(--border);
}
.guide-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); color: var(--muted); vertical-align: top; }
.guide-table tr:last-child td { border-bottom: none; }
.guide-badge {
  display: inline-block;
  background: var(--accent-lt);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: .75rem;
  font-weight: 700;
  margin-right: 4px;
}

/* ── Prose (Privacy/Legal) ──────────────────────────────────────── */
.prose-wrap { max-width: 780px; margin: 0 auto; padding: 56px 24px 80px; }
.prose-wrap h2 { font-size: 1.25rem; font-weight: 700; margin: 40px 0 10px; color: var(--text); }
.prose-wrap h2:first-child { margin-top: 0; }
.prose-wrap p { color: var(--muted); font-size: .9rem; line-height: 1.8; margin-bottom: 14px; }
.prose-wrap ul { margin: 0 0 14px 22px; color: var(--muted); font-size: .9rem; line-height: 1.8; }
.prose-wrap a { color: var(--accent); }
.prose-last-updated {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: 36px;
}

/* ── Inline link btn ────────────────────────────────────────────── */
.btn-green {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 11px 26px;
  border-radius: 99px;
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  transition: background .15s, transform .12s;
}
.btn-green:hover { background: var(--accent-h); transform: translateY(-1px); }
.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  padding: 10px 24px;
  border-radius: 99px;
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  transition: background .15s, color .15s;
}
.btn-outline:hover { background: var(--accent); color: #fff; }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .guide-layout { grid-template-columns: 1fr; }
  .guide-toc { position: static; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .page-hero { padding: 52px 20px 44px; }
  .site-section { padding: 52px 20px; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .nav-link { display: none; }
  .nav-link.nav-cta { display: inline-block; }
  .nav-cta { margin-left: 0; }
  .guide-wrap { padding: 32px 16px 60px; }
  .prose-wrap { padding: 36px 16px 60px; }
}