:root {
  --ink: #17203A;
  --ink-soft: #4A5470;
  --paper: #edf2ff;
  --paper-card: rgba(255, 255, 255, 0.78);
  --line: rgba(104, 119, 167, 0.18);
  --doc-blue: #2a5bd7;
  --doc-blue-dark: #1b3f9a;
  --pdf-red: #d93b4d;
  --pdf-red-dark: #b92d3d;
  --focus: #7c5cff;
  --bg-strong: #f7f9ff;
  --card-shadow: 0 20px 45px -25px rgba(24, 41, 84, 0.45);
  --soft-shadow: 0 12px 26px rgba(20, 32, 62, 0.08);

  --font-display: "Source Serif 4", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(77, 119, 255, 0.18), transparent 30%),
    radial-gradient(circle at bottom right, rgba(217, 59, 77, 0.12), transparent 28%),
    linear-gradient(180deg, #f6f8ff 0%, #eef3ff 100%);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: -18% auto auto -10%;
  width: 32rem;
  height: 32rem;
  background: rgba(90, 129, 255, 0.09);
  border-radius: 50%;
  filter: blur(32px);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  inset: auto -12% -18% auto;
  width: 28rem;
  height: 28rem;
  background: rgba(217, 59, 77, 0.08);
  border-radius: 50%;
  filter: blur(30px);
  pointer-events: none;
  z-index: 0;
}

main, header, footer {
  position: relative;
  z-index: 1;
}

a { color: var(--doc-blue-dark); }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0 0 .4em; color: var(--ink); }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 2rem; max-width: 1160px; margin: 0 auto;
  backdrop-filter: blur(18px);
  background: rgba(246, 248, 255, 0.72);
  border-bottom: 1px solid rgba(150, 164, 207, 0.15);
}
.brand {
  display: flex; align-items: center; gap: .65rem;
  font-family: var(--font-display); font-weight: 700; font-size: 1.25rem;
  color: var(--ink); text-decoration: none;
  letter-spacing: -.02em;
}
.brand-mark {
  display: inline-flex; align-items: center; gap: 2px;
  font-family: var(--font-mono); font-size: .8rem; font-weight: 600;
  border: 1px solid rgba(108, 122, 180, 0.22);
  border-radius: 10px; padding: 4px 8px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.8);
}
.mark-doc { color: var(--doc-blue); }
.mark-arrow { color: var(--ink-soft); }
.mark-pdf { color: var(--pdf-red); }
.site-nav { display: flex; align-items: center; gap: 1.2rem; }
.site-nav a {
  margin-left: 0;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .95rem;
  padding: .5rem .9rem;
  border-radius: 999px;
  transition: background .15s ease, color .15s ease, transform .15s ease;
}
.site-nav a:hover {
  color: var(--ink);
  background: rgba(61, 89, 178, 0.06);
  transform: translateY(-1px);
}

/* ---------- Hero ---------- */
.hero {
  max-width: 1160px; margin: 0 auto; padding: 2.9rem 2rem 3.5rem;
  display: grid; grid-template-columns: 1.06fr .94fr; gap: 2.4rem; align-items: center;
}
.hero-copy {
  padding: 1rem 0;
}
.eyebrow {
  display: inline-flex;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .1em;
  font-size: .75rem; color: var(--doc-blue-dark); margin: 0 0 .9rem;
  background: rgba(42, 91, 215, 0.08);
  border: 1px solid rgba(42, 91, 215, 0.12);
  border-radius: 999px;
  padding: .5rem .8rem;
}
.hero h1 { font-size: clamp(2.1rem, 3vw, 3.2rem); line-height: 1.08; max-width: 20ch; letter-spacing: -.06em; }
.lede { color: var(--ink-soft); font-size: 1.05rem; max-width: 46ch; }

/* ---------- Converter / dropzone ---------- */
.converter {
  position: sticky;
  top: 6.2rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.72), rgba(245,247,255,0.9));
  border: 1px solid rgba(118, 130, 181, 0.18);
  border-radius: 30px;
  padding: 1.15rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(14px);
}
.dropzone {
  position: relative;
  background: linear-gradient(180deg, #fff 0%, #f6f8ff 100%);
  border: 1.5px dashed rgba(67, 92, 188, 0.42);
  border-radius: 22px;
  padding: 2.4rem 1.8rem 2.1rem;
  text-align: center;
  cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease, background .18s ease;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.9), 0 14px 30px rgba(38, 57, 105, 0.05);
}
.dropzone:hover, .dropzone.is-dragover {
  border-color: var(--doc-blue);
  background: linear-gradient(180deg, #ffffff 0%, #f5f7ff 100%);
  box-shadow: 0 0 0 4px rgba(42, 91, 215, 0.08), 0 18px 45px rgba(30, 46, 91, 0.08);
  transform: translateY(-1px);
}
.paper-stack { position: relative; height: 98px; margin: 0 auto 1.1rem; width: 90px; }
.sheet {
  position: absolute; left: 0; right: 0; top: 0; margin: auto;
  width: 72px; height: 88px; background: #fff; border: 1px solid rgba(123, 137, 188, 0.2);
  border-radius: 10px; box-shadow: 0 12px 18px rgba(18, 28, 54, 0.08);
}
.sheet-2 { transform: rotate(-6deg) translateY(4px); }
.sheet-3 { transform: rotate(6deg) translateY(8px); }
.sheet-1 { display: flex; align-items: flex-end; justify-content: center; padding-bottom: 10px; background: linear-gradient(180deg, #ffffff 0%, #f0f4ff 95%); }
.sheet-badge {
  font-family: var(--font-mono); font-size: .58rem; font-weight: 600;
  letter-spacing: .06em; padding: 4px 7px; border-radius: 5px; color: #fff;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}
.badge-doc { background: linear-gradient(135deg, var(--doc-blue), #4e81ff); }
.badge-pdf { background: linear-gradient(135deg, var(--pdf-red), #ef5b69); }

.dz-title { font-weight: 700; margin: 0 0 .3rem; font-size: 1.1rem; }
.dz-sub { color: var(--ink-soft); font-size: .92rem; margin: 0; }
.link-btn {
  background: none; border: none; padding: 0; color: var(--doc-blue-dark);
  text-decoration: underline; cursor: pointer; font: inherit;
}

.status {
  min-height: 1.6rem;
  margin-top: .95rem;
  text-align: center;
  font-size: .92rem;
  color: var(--ink-soft);
}
.status.is-error { color: var(--pdf-red-dark); }

.result {
  display: flex; align-items: center; gap: 1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(244,247,255,0.9));
  border: 1px solid rgba(131, 144, 197, 0.2);
  border-radius: 18px;
  padding: 1.05rem 1.1rem;
  margin-top: 1rem;
  box-shadow: var(--soft-shadow);
}
.result-icon .sheet-badge { padding: 7px 9px; font-size: .68rem; border-radius: 8px; }
.result-text { flex: 1; min-width: 0; }
.result-name { font-family: var(--font-mono); font-size: .88rem; margin: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.result-sub { margin: 2px 0 0; font-size: .82rem; color: var(--ink-soft); }
.btn-download {
  background: linear-gradient(135deg, var(--pdf-red), #ef5367);
  color: #fff; text-decoration: none;
  padding: .7rem 1.08rem; border-radius: 12px; font-weight: 700; font-size: .9rem;
  white-space: nowrap;
  box-shadow: 0 12px 22px rgba(217,59,77,0.2);
  transition: transform .15s ease, box-shadow .15s ease, filter .15s ease;
}
.btn-download:hover {
  background: linear-gradient(135deg, var(--pdf-red-dark), #d63f4b);
  transform: translateY(-1px);
  box-shadow: 0 16px 28px rgba(217,59,77,0.24);
  filter: saturate(1.05);
}

/* ---------- Ad slots ---------- */
.ad-slot {
  max-width: 1160px; margin: 0 auto; padding: 0 2rem 2.5rem;
  display: flex; justify-content: center;
}
.ad-slot ins { max-width: 100%; }

/* ---------- How it works ---------- */
.how-it-works { max-width: 1160px; margin: 0 auto; padding: 1rem 2rem 3rem; }
.steps {
  list-style: none; margin: 1.6rem 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1.4rem;
}
.steps li {
  padding: 1.2rem 1.1rem 1.1rem;
  background: rgba(255,255,255,.55);
  border: 1px solid rgba(121, 134, 186, 0.15);
  border-radius: 20px;
  box-shadow: 0 12px 24px rgba(18, 31, 63, 0.04);
}
.step-num { font-family: var(--font-mono); color: var(--doc-blue); font-size: .82rem; }
.steps h3 { font-size: 1.1rem; margin: .55rem 0 .35rem; }
.steps p { color: var(--ink-soft); font-size: .92rem; margin: 0; }

/* ---------- Trust ---------- */
.trust {
  background: rgba(255,255,255,0.55);
  border-top: 1px solid rgba(120, 136, 193, 0.12);
  border-bottom: 1px solid rgba(120, 136, 193, 0.12);
  backdrop-filter: blur(8px);
}
.trust > h2 { max-width: 1160px; margin: 0 auto; padding: 2.7rem 2rem 0; }
.trust-grid {
  max-width: 1160px; margin: 0 auto; padding: 1.5rem 2rem 2.8rem;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.4rem;
}
.trust-grid > div {
  background: rgba(255,255,255,.7);
  border: 1px solid rgba(130, 144, 197, 0.15);
  border-radius: 18px;
  padding: 1.2rem 1.1rem;
  box-shadow: var(--soft-shadow);
}
.trust-grid h3 { font-size: 1.05rem; }
.trust-grid p { color: var(--ink-soft); font-size: .92rem; margin: 0; }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; padding: 3rem 2rem 4rem; }
.faq details {
  background: rgba(255,255,255,.52);
  border: 1px solid rgba(125, 138, 190, 0.12);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  margin-bottom: .8rem;
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { color: var(--ink-soft); margin: .75rem 0 0; }

/* ---------- Footer ---------- */
.site-footer {
  max-width: 1160px; margin: 0 auto; padding: 2rem;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--ink-soft); font-size: .85rem; border-top: 1px solid rgba(134, 147, 201, 0.12);
}
.site-footer nav a { color: var(--ink-soft); margin-left: 1rem; }

@media (max-width: 860px) {
  .site-header { padding-inline: 1.1rem; }
  .hero { grid-template-columns: 1fr; padding-inline: 1.1rem; }
  .converter { position: static; }
  .steps, .trust-grid { grid-template-columns: 1fr; }
  .how-it-works, .trust > h2, .trust-grid, .faq, .ad-slot { padding-left: 1.1rem; padding-right: 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}