:root {
  color-scheme: light;
  --ink: #1c1f24; --muted: #646a73; --line: #e3e5e8; --bg: #fbfaf7; --card: #fff;
  --accent: #1f6b54; --accent-2: #e6f2ec; --accent-ink: #15523f; --on-accent: #fff; --warn: #b3261e; --warn-bg: #fdecea;
  --soft: #eef0ee; --hover: #f6fbf8; --dash: #b9c7c0; --field: #fff; --field-line: #cfd3d8; --body2: #3b4048;
  --top: rgba(251,250,247,.9); --bub-a: #e9eaec; --bub-b: #cfe9d8; --rule2: #dfe2e5; --pv: #f1f1f1;
  --r: 14px; --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06); --pop: 0 10px 30px rgba(0,0,0,.14), 0 2px 6px rgba(0,0,0,.06);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e7ebe9; --muted: #9aa49f; --line: #2a312e; --bg: #0f1312; --card: #171c1a;
  --accent: #4dbb92; --accent-2: #17362b; --accent-ink: #bfe9d6; --on-accent: #06140f; --warn: #ff8a80; --warn-bg: #3a1a18;
  --soft: #232a27; --hover: #1a2622; --dash: #3b4843; --field: #121614; --field-line: #353e3a; --body2: #c8cfcc;
  --top: rgba(15,19,18,.85); --bub-a: #2b322f; --bub-b: #22473a; --rule2: #2f3633; --pv: #0b0e0d;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35); --pop: 0 12px 34px rgba(0,0,0,.5), 0 2px 6px rgba(0,0,0,.3);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
a { color: var(--accent); }
code { background: var(--soft); padding: 1px 5px; border-radius: 5px; font-size: .9em; }
[hidden] { display: none !important; }
.wrap { max-width: 980px; margin: 0 auto; padding-inline: 20px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.muted { color: var(--muted); }
small { color: var(--muted); font-weight: 400; }

.top { border-bottom: 1px solid var(--line); background: var(--top); backdrop-filter: blur(6px); position: sticky; top: 0; z-index: 5; }
.top .row { padding-block: 12px; }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 9px; }
.logo { width: 24px; height: 24px; border-radius: 7px; background: #1f6b54; position: relative; }
.logo::after { content: ""; position: absolute; inset: 6px 5px 8px 5px; border: 2px solid #fff; border-radius: 3px; border-bottom-left-radius: 0; }
nav { display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--ink); }

.hero { padding: 56px 0 18px; text-align: center; }
.hero h1 { font-size: clamp(30px, 5.4vw, 50px); line-height: 1.1; letter-spacing: -.02em; margin: 0 0 16px; }
.lead { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 auto 14px; }
.private { display: inline-block; background: var(--accent-2); color: var(--accent-ink); padding: 8px 14px; border-radius: 999px; font-size: 15px; margin: 6px 0 0; text-align: left; }
.lock { display: inline-block; width: 13px; height: 11px; background: currentColor; border-radius: 2px; position: relative; margin: 0 6px 0 2px; vertical-align: -1px; }
.lock::before { content: ""; position: absolute; left: 3px; top: -6px; width: 8px; height: 8px; border: 2px solid currentColor; border-bottom: 0; border-radius: 5px 5px 0 0; box-sizing: border-box; }

.tool { padding-block: 22px 40px; }
#panel, #pv, #tool, #how, #pricing, #faq { scroll-margin-top: 70px; }
.drop { background: var(--card); border: 2px dashed var(--dash); border-radius: 20px; padding: 44px 20px; text-align: center; cursor: pointer; transition: .15s; box-shadow: var(--shadow); }
.drop:hover, .drop.over, .drop:focus-visible { border-color: var(--accent); background: var(--hover); outline: none; }
.drop-icon { width: 54px; height: 64px; margin: 0 auto 14px; border-radius: 8px; background: linear-gradient(var(--card),var(--card)) padding-box, linear-gradient(var(--accent), #3c9a7c) border-box; border: 3px solid transparent; position: relative; }
.drop-icon::after { content: "PDF"; position: absolute; bottom: 8px; left: 0; right: 0; font: 700 12px/1 system-ui; color: var(--accent); }
.drop-title { font-size: 21px; font-weight: 650; margin: 0 0 4px; }
.drop-sub { margin: 0; color: var(--muted); }
.drop-help { margin: 14px 0 0; font-size: 14px; }

.busy { margin: 18px 0; text-align: center; }
.bar { height: 8px; background: var(--soft); border-radius: 9px; overflow: hidden; max-width: 460px; margin: 0 auto 8px; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.err { color: var(--warn); background: var(--warn-bg); padding: 12px 14px; border-radius: 10px; }
.ok { color: var(--accent-ink); background: var(--accent-2); padding: 12px 14px; border-radius: 10px; }

.panel { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 24px; box-shadow: var(--shadow); }
.summary { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; border-bottom: 1px solid var(--line); padding-bottom: 14px; margin-bottom: 18px; }
.summary h2 { margin: 0; font-size: 22px; word-break: break-word; }
.summary p { margin: 2px 0 0; }
.link { background: none; border: 0; color: var(--accent); text-decoration: underline; cursor: pointer; font: inherit; font-size: 14px; white-space: nowrap; }

fieldset { border: 0; padding: 0; margin: 0 0 18px; }
legend { font-weight: 650; margin-bottom: 8px; }
.styles { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.style-card { display: flex; gap: 12px; align-items: flex-start; border: 1.5px solid var(--line); border-radius: var(--r); padding: 12px; cursor: pointer; }
.style-card:has(input:checked) { border-color: var(--accent); background: var(--hover); }
.style-card input { margin-top: 4px; accent-color: var(--accent); }
.style-card b { display: block; }
.style-card small { display: block; font-size: 13.5px; line-height: 1.4; }
.sc-img { flex: none; width: 46px; height: 58px; border: 1px solid var(--line); border-radius: 4px; background: var(--card); position: relative; overflow: hidden; }
.sc-chat::before, .sc-chat::after { content: ""; position: absolute; height: 8px; border-radius: 3px; }
.sc-chat::before { left: 5px; top: 8px; width: 24px; background: var(--bub-a); box-shadow: 0 22px 0 var(--bub-a); }
.sc-chat::after { right: 5px; top: 19px; width: 22px; background: var(--bub-b); box-shadow: 0 22px 0 var(--bub-b); }
.sc-rec { background: repeating-linear-gradient(var(--card) 0 6px, var(--bub-a) 6px 7px); }
.sc-rec::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 9px; background: var(--rule2); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; }
.grid label { display: flex; flex-direction: column; font-size: 14px; font-weight: 600; gap: 5px; }
.grid label.check { display: block; font-weight: 500; }
.grid label.check input { vertical-align: -3px; margin: 0 6px 0 0; }
.grid input:not([type=checkbox]), .grid select { font: inherit; font-weight: 400; padding: 9px 10px; border: 1px solid var(--field-line); border-radius: 9px; background: var(--field); color: var(--ink); width: 100%; min-width: 0; }
.grid input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; align-items: center; }
.buy { display: flex; gap: 10px; flex-wrap: wrap; }
.btn { font: inherit; font-weight: 650; border: 0; border-radius: 11px; padding: 13px 20px; background: var(--accent); color: var(--on-accent); cursor: pointer; box-shadow: 0 1px 0 rgba(0,0,0,.08); }
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: var(--card); color: var(--accent); border: 1.5px solid var(--accent); }
.fine { font-size: 13.5px; color: var(--muted); margin: 12px 0 0; }
.pv { margin-top: 20px; }
.pv iframe { width: 100%; height: 75vh; border: 1px solid var(--line); border-radius: 12px; background: var(--pv); }

section h2 { font-size: 28px; letter-spacing: -.01em; }
.how, .pricing, .faq { padding-block: 30px; }
.steps { padding-left: 22px; }
.steps li { margin-bottom: 18px; }
.steps p { margin: 4px 0; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; }
.card.hl { border-color: var(--accent); box-shadow: var(--shadow); }
.card h3 { margin: 0; }
.price { font-size: 30px; font-weight: 750; margin: 6px 0 8px; }
.card ul { padding-left: 18px; margin: 0; font-size: 15px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 2px; color: var(--body2); }

.foot { border-top: 1px solid var(--line); margin-top: 30px; padding-block: 24px; font-size: 14px; color: var(--muted); }

/* content pages */
.doc { max-width: 720px; padding-block: 40px 20px; }
.doc h1 { font-size: clamp(28px, 4.5vw, 40px); line-height: 1.15; letter-spacing: -.015em; }
.doc h2 { font-size: 22px; margin-top: 34px; }
.doc li { margin-bottom: 6px; }
.cta { background: var(--accent-2); border-radius: var(--r); padding: 18px 20px; margin: 28px 0; }
.cta p { margin: 0 0 10px; }
.cta .btn { display: inline-block; text-decoration: none; }
.note { border-left: 3px solid var(--accent); padding: 4px 14px; color: var(--body2); background: var(--card); }

@media (max-width: 720px) {
  .styles, .grid, .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 34px; }
  .lead { font-size: 17px; }
  nav { gap: 12px; }
  .top nav a:nth-child(n+3) { display: none; }
  .top-right { gap: 10px; }
  .panel { padding: 16px; }
  .summary { flex-direction: column-reverse; }
  .private { border-radius: 14px; }
  .btn { width: 100%; }
  .buy { width: 100%; }
}
.langs { font-size: 13px; gap: 8px; }
.langs b { color: var(--ink); }

/* theme toggle */
.top .row { flex-wrap: nowrap; }
.top-right { display: flex; align-items: center; gap: 18px; min-width: 0; }
.theme-toggle { flex: none; width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); display: grid; place-items: center; cursor: pointer; padding: 0; }
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
body, .top, .panel, .card, details, .drop, .btn, .grid input, .nsel-btn { transition: background-color .2s, border-color .2s, color .2s; }

/* custom select */
.nsel { position: relative; width: 100%; }
.nsel-native { position: absolute !important; opacity: 0; pointer-events: none; width: 1px; height: 1px; }
.nsel-btn { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 10px; font: inherit; font-weight: 400; text-align: left; padding: 9px 12px; border: 1px solid var(--field-line); border-radius: 9px; background: var(--field); color: var(--ink); cursor: pointer; }
.nsel-btn:hover { border-color: var(--accent); }
.nsel-btn:focus-visible, .nsel.open .nsel-btn { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-2); }
.nsel-btn span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nsel-btn::after { content: ""; flex: none; width: 8px; height: 8px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: translateY(-2px) rotate(45deg); transition: transform .15s; }
.nsel.open .nsel-btn::after { transform: translateY(2px) rotate(-135deg); }
.nsel-list { position: absolute; z-index: 20; left: 0; right: 0; top: calc(100% + 6px); margin: 0; padding: 6px; list-style: none; background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--pop); max-height: 280px; overflow-y: auto; }
.nsel-list li { display: flex; align-items: center; gap: 8px; padding: 9px 10px 9px 30px; border-radius: 8px; cursor: pointer; font-weight: 400; color: var(--ink); position: relative; }
.nsel-list li.active { background: var(--hover); }
.nsel-list li[aria-selected="true"] { color: var(--accent); font-weight: 600; }
.nsel-list li[aria-selected="true"]::before { content: ""; position: absolute; left: 11px; top: 50%; width: 5px; height: 10px; border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: translateY(-65%) rotate(45deg); }

.restore { margin-top: 14px; background: none; border: 0; padding: 0; }
.restore summary { font-weight: 500; font-size: 14px; color: var(--accent); }
.restore form p { margin: 8px 0; font-size: 14px; }
.restore-row { display: flex; gap: 8px; flex-wrap: wrap; }
.restore-row input { flex: 1 1 220px; font: inherit; padding: 10px 12px; border: 1px solid var(--field-line); border-radius: 9px; background: var(--field); color: var(--ink); min-width: 0; }
.restore-row .btn { padding: 10px 16px; width: auto; }