/* ============================================================
   SwiftPDF — design system
   Dark premium theme · glassmorphism · gradient accents
   ============================================================ */
:root {
  --bg-0: #060a15;
  --bg-1: #0a1022;
  --bg-2: #0e1730;
  --ink: #eef2ff;
  --muted: #a3aecb;
  --faint: #7e8cb4;
  --accent: #6d7cff;
  --accent-2: #22d3ee;
  --accent-warm: #ff8a5c;
  --grad: linear-gradient(135deg, #6d7cff 0%, #22d3ee 100%);
  --grad-warm: linear-gradient(135deg, #ff5f6d 0%, #ff8a5c 100%);
  --card: rgba(255, 255, 255, 0.045);
  --card-strong: rgba(255, 255, 255, 0.07);
  --stroke: rgba(255, 255, 255, 0.10);
  --stroke-soft: rgba(255, 255, 255, 0.06);
  --radius: 18px;
  --radius-sm: 12px;
  /* 8px-base spacing scale */
  --sp-1: 0.5rem; --sp-2: 1rem; --sp-3: 1.5rem; --sp-4: 2rem;
  --sp-5: 2.5rem; --sp-6: 3rem; --sp-8: 4rem; --sp-10: 5rem; --sp-12: 6rem;
  /* type scale */
  --fs-xs: 0.75rem; --fs-sm: 0.875rem; --fs-base: 1rem; --fs-md: 1.125rem;
  --fs-lg: 1.25rem; --fs-xl: 1.5rem; --fs-2xl: 1.875rem; --fs-3xl: 2.5rem;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --maxw: 1140px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1100px 520px at 12% -6%, rgba(109, 124, 255, 0.16), transparent 60%),
    radial-gradient(900px 480px at 88% 4%, rgba(34, 211, 238, 0.10), transparent 60%),
    radial-gradient(700px 600px at 50% 110%, rgba(109, 124, 255, 0.08), transparent 60%),
    var(--bg-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, svg, canvas { max-width: 100%; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.22; letter-spacing: -0.02em; margin: 0 0 0.6em; }
h1 { font-size: clamp(2rem, 4.6vw, 3.2rem); }
h2 { font-size: clamp(1.35rem, 2.6vw, var(--fs-2xl)); margin-top: var(--sp-4); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; color: var(--muted); }
strong, b { color: var(--ink); }
code {
  font-family: var(--mono); font-size: 0.88em;
  background: rgba(255,255,255,0.07); padding: 0.15em 0.45em; border-radius: 6px;
  color: var(--ink);
}
.container { width: min(var(--maxw), calc(100% - 2.5rem)); margin: 0 auto; }
section { padding: 4.5rem 0; }
.eyebrow {
  display: inline-block; font-size: var(--fs-xs); font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-2);
  margin-bottom: var(--sp-2);
}
.lede { font-size: var(--fs-md); max-width: 44rem; }
.grad-text {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 10, 21, 0.72);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--stroke-soft);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: var(--sp-1); font-weight: 800; font-size: var(--fs-lg); color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 34px; height: 34px; filter: drop-shadow(0 4px 12px rgba(109,124,255,.5)); }
.nav-list { display: flex; align-items: center; gap: 0.25rem; list-style: none; margin: 0; padding: 0; }
.nav-list > li { position: relative; }
.nav-list a {
  display: block; padding: var(--sp-1) var(--sp-2); color: var(--muted);
  font-weight: 600; font-size: var(--fs-sm); border-radius: 10px;
}
.nav-list a:hover { color: var(--ink); text-decoration: none; background: rgba(255,255,255,0.05); }
.has-sub .sub {
  display: none; position: absolute; top: 100%; left: 0; min-width: 230px;
  list-style: none; margin: 0.35rem 0 0; padding: 0.5rem;
  background: var(--bg-2); border: 1px solid var(--stroke); border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.has-sub:hover .sub, .has-sub:focus-within .sub { display: block; }
.sub a { white-space: nowrap; }
.nav-toggle { display: none; background: none; border: 1px solid var(--stroke); border-radius: 10px; padding: var(--sp-1) 0.75rem; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-1);
  padding: 0.75rem var(--sp-3); border-radius: 999px; font-weight: 700; font-size: var(--fs-base);
  border: 1px solid transparent; cursor: pointer; transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--grad); color: #06101f; box-shadow: 0 12px 32px rgba(109,124,255,.35); }
.btn-ghost { background: rgba(255,255,255,0.05); color: var(--ink); border-color: var(--stroke); }
.btn-ghost:hover { background: rgba(255,255,255,0.10); }
.btn-sm { padding: var(--sp-1) var(--sp-2); font-size: var(--fs-sm); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ---------- cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--stroke);
  border-radius: var(--radius); padding: var(--sp-4);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-4px); border-color: rgba(109,124,255,.45); box-shadow: var(--shadow); }
.card h3 { margin-top: 0; }
.card p { font-size: var(--fs-base); }
.card-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: var(--grad); margin-bottom: var(--sp-2);
  box-shadow: 0 10px 26px rgba(109,124,255,.35);
}
.card-icon svg { width: 26px; height: 26px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--sp-3); margin-top: var(--sp-5); }
.tool-grid .card { display: flex; flex-direction: column; }
.tool-grid .card .btn { margin-top: auto; align-self: flex-start; }

/* ---------- hero ---------- */
.hero { padding: 5.5rem 0 4rem; position: relative; overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 3rem; align-items: center; }
.hero h1 { font-size: clamp(2.4rem, 5.4vw, 3.9rem); margin-bottom: 1rem; }
.hero .lede { font-size: 1.2rem; }
.hero-cta { display: flex; gap: var(--sp-2); flex-wrap: wrap; margin: var(--sp-4) 0 var(--sp-3); }
.hero-badges { display: flex; gap: var(--sp-3); flex-wrap: wrap; font-size: var(--fs-sm); color: var(--faint); }
.hero-badges span { display: inline-flex; align-items: center; gap: var(--sp-1); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--grad); display: inline-block; }
.hero-art { position: relative; min-height: 380px; }
.float-slow { animation: floaty 7s ease-in-out infinite; }
.float-slower { animation: floaty 9s ease-in-out infinite reverse; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
@media (prefers-reduced-motion: reduce) {
  .float-slow, .float-slower { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- feature / why-private ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.check-list { list-style: none; padding: 0; margin: 1.4rem 0 0; }
.check-list li { position: relative; padding-left: var(--sp-4); margin-bottom: var(--sp-2); color: var(--muted); }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0.1em;
  width: 1.4em; height: 1.4em; border-radius: 50%; background: var(--grad);
  color: #06101f; font-weight: 800; font-size: 0.8em; display: grid; place-items: center;
}
.privacy-note {
  display: flex; gap: 1rem; align-items: flex-start;
  background: rgba(34, 211, 238, 0.07); border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: var(--radius-sm); padding: var(--sp-2) 1.25rem; margin: var(--sp-4) 0; font-size: var(--fs-sm);
}
.privacy-note svg { flex: 0 0 26px; width: 26px; height: 26px; margin-top: 2px; }
.privacy-note p { margin: 0; }

/* ---------- steps ---------- */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.25rem; margin: var(--sp-4) 0; counter-reset: step; }
.step {
  background: var(--card); border: 1px solid var(--stroke); border-radius: var(--radius-sm);
  padding: var(--sp-3); position: relative;
  transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}
.step:hover { transform: translateY(-3px); border-color: rgba(109,124,255,.4); box-shadow: 0 14px 34px rgba(0,0,0,.35); }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; top: -16px; left: 1.2rem;
  width: 34px; height: 34px; border-radius: 50%; background: var(--grad);
  color: #06101f; font-weight: 800; display: grid; place-items: center;
  box-shadow: 0 8px 20px rgba(109,124,255,.4);
}
.step h3 { margin: var(--sp-1) 0 var(--sp-1); font-size: var(--fs-base); }
.step p { margin: 0; font-size: var(--fs-sm); }

/* ---------- tool UI ---------- */
.toolbox {
  background: var(--card-strong); border: 1px solid var(--stroke);
  border-radius: var(--radius); padding: var(--sp-4); margin: var(--sp-4) 0;
  box-shadow: var(--shadow);
}
.dropzone {
  border: 2px dashed rgba(109,124,255,.45); border-radius: var(--radius-sm);
  padding: var(--sp-5) var(--sp-3); text-align: center; cursor: pointer;
  transition: border-color .2s, background .2s; background: rgba(109,124,255,.04);
}
.dropzone:hover, .dropzone.dragover { border-color: var(--accent-2); background: rgba(34,211,238,.06); }
.dropzone p { margin: 0.4rem 0 0; }
.file-list { list-style: none; padding: 0; margin: 1.4rem 0 0; }
.file-list li {
  display: flex; align-items: center; gap: 0.75rem;
  background: rgba(255,255,255,.04); border: 1px solid var(--stroke-soft);
  border-radius: var(--radius-sm); padding: 0.75rem var(--sp-2); margin-bottom: var(--sp-1);
}
.file-list .fname { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; font-size: 0.93rem; }
.file-list .fmeta { color: var(--faint); font-size: 0.82rem; white-space: nowrap; }
.icon-btn {
  background: rgba(255,255,255,.06); border: 1px solid var(--stroke); color: var(--ink);
  border-radius: 8px; width: 32px; height: 32px; cursor: pointer; font-size: 1rem; line-height: 1;
}
.icon-btn:hover { background: rgba(255,255,255,.12); }
.icon-btn.danger:hover { background: rgba(255,95,109,.25); border-color: rgba(255,95,109,.5); }
.tool-controls { display: flex; gap: var(--sp-2); flex-wrap: wrap; margin-top: var(--sp-3); align-items: center; }
.field { display: flex; flex-direction: column; gap: var(--sp-1); margin-bottom: var(--sp-2); }
.field label { font-weight: 700; font-size: 0.92rem; }
.field .hint { font-size: 0.84rem; color: var(--faint); font-weight: 400; }
input[type="text"], input[type="email"], textarea, select {
  background: rgba(255,255,255,.05); border: 1px solid var(--stroke); color: var(--ink);
  border-radius: 10px; padding: 0.75rem 1rem; font-size: 1rem; font-family: var(--font); width: 100%;
}
input[type="text"]:focus, input[type="email"]:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(109,124,255,.25);
}
select option { background: var(--bg-2); }
input[type="range"] { width: 100%; accent-color: var(--accent-2); }
.status {
  margin-top: var(--sp-3); padding: var(--sp-2) 1.25rem; border-radius: var(--radius-sm);
  font-size: var(--fs-sm); display: none;
}
.status.show { display: block; }
.status.info { background: rgba(109,124,255,.12); border: 1px solid rgba(109,124,255,.35); color: var(--ink); }
.status.success { background: rgba(52, 211, 153, .10); border: 1px solid rgba(52,211,153,.4); color: #b8f4d8; }
.status.error { background: rgba(255,95,109,.10); border: 1px solid rgba(255,95,109,.4); color: #ffc9ce; }
.result-box { margin-top: 1.4rem; display: none; }
.result-box.show { display: block; }
.qr-stage { display: grid; place-items: center; background: #fff; border-radius: var(--radius-sm); padding: 1.6rem; margin-top: 1.2rem; min-height: 200px; }
.qr-stage img, .qr-stage canvas { image-rendering: pixelated; }
.slider-row { display: flex; align-items: center; gap: 1rem; }
.slider-val { font-family: var(--mono); min-width: 3.2rem; text-align: right; color: var(--accent-2); font-weight: 700; }

/* ---------- FAQ ---------- */
.faq details {
  background: var(--card); border: 1px solid var(--stroke);
  border-radius: var(--radius-sm); margin-bottom: 0.8rem; overflow: hidden;
}
.faq summary {
  cursor: pointer; padding: var(--sp-2) var(--sp-3); font-weight: 700; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-size: 1.4rem; font-weight: 300; color: var(--accent-2);
  transition: transform .2s; flex: 0 0 auto;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .faq-a { padding: 0 var(--sp-3) var(--sp-3); color: var(--muted); }
.faq .faq-a p:last-child { margin-bottom: 0; }

/* ---------- posts ---------- */
.post { max-width: 780px; margin: 0 auto; padding: 3rem 0 1rem; }
.post-meta { color: var(--faint); font-size: var(--fs-sm); margin-bottom: var(--sp-4); }
.breadcrumbs { font-size: var(--fs-sm); color: var(--faint); margin-bottom: var(--sp-3); }
.breadcrumbs a { color: var(--muted); }
.post ul, .post ol { color: var(--muted); padding-left: 1.4rem; }
.post li { margin-bottom: 0.5rem; }
.callout {
  background: var(--grad); border-radius: var(--radius-sm); padding: 1.6rem 1.8rem;
  margin: 2.2rem 0; color: #06101f;
}
.callout h3, .callout .callout-h { margin: 0 0 var(--sp-1); color: #06101f; font-size: var(--fs-lg); }
.callout p { color: rgba(6,16,31,.85); margin-bottom: 1rem; }
.callout .btn { background: #06101f; color: #fff; box-shadow: none; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--sp-2); margin-top: var(--sp-3); }
.related-grid a {
  display: block; background: var(--card); border: 1px solid var(--stroke);
  border-radius: var(--radius-sm); padding: var(--sp-2) var(--sp-3); color: var(--ink); font-weight: 600; font-size: var(--fs-sm);
  transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}
.related-grid a:hover { text-decoration: none; border-color: rgba(109,124,255,.5); transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0,0,0,.32); }
.guides-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-top: var(--sp-4); }
.guide-card {
  background: var(--card); border: 1px solid var(--stroke); border-radius: var(--radius-sm);
  padding: var(--sp-3); color: var(--ink);
  transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}
.guide-card:hover { text-decoration: none; border-color: rgba(109,124,255,.5); transform: translateY(-3px); box-shadow: 0 16px 40px rgba(0,0,0,.38); }
.guide-card h3 { font-size: var(--fs-base); margin: 0 0 var(--sp-1); }
.guide-card p { font-size: var(--fs-sm); margin: 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--stroke-soft); margin-top: 4rem; padding: 3.5rem 0 2rem; background: rgba(6,10,21,.6); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2.5rem; }
.footer-grid .footer-h { font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: 0.08em; color: var(--faint); margin: 0 0 var(--sp-2); }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: var(--sp-1); }
.footer-grid a { color: var(--muted); font-size: var(--fs-sm); }
.footer-grid a:hover { color: var(--ink); }
.footer-bottom { border-top: 1px solid var(--stroke-soft); padding-top: var(--sp-3); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; color: var(--faint); font-size: 0.86rem; }

/* ---------- misc ---------- */
.page-head { padding: 4rem 0 1rem; max-width: 780px; }
.page-head .lede { margin-bottom: 0; }
.skip-link { position: absolute; left: -999px; }
:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 6px;
}
input[type="text"]:focus-visible, input[type="email"]:focus-visible,
textarea:focus-visible, select:focus-visible { outline: none; }
.skip-link:focus { left: 1rem; top: 1rem; background: var(--accent); color: #06101f; padding: 0.6rem 1rem; border-radius: 8px; z-index: 100; }
table.data { width: 100%; border-collapse: collapse; margin: 1.6rem 0; font-size: 0.94rem; }
table.data th, table.data td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--stroke-soft); color: var(--muted); }
table.data th { color: var(--ink); font-weight: 700; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero-inner, .split { grid-template-columns: 1fr; }
  .hero-art { min-height: 300px; order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-list {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch;
    background: var(--bg-2); border-bottom: 1px solid var(--stroke); padding: 0.8rem 1.2rem 1.2rem;
  }
  .nav-list.open { display: flex; }
  .has-sub .sub { position: static; display: block; box-shadow: none; border: none; background: transparent; padding: 0 0 0 1rem; margin: 0; }
  section { padding: 3rem 0; }
  .toolbox { padding: 1.4rem; }
  .tool-controls .btn { width: 100%; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
  .conv-grid { grid-template-columns: 1fr !important; }
}