:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f6;
  --surface: #ffffff;
  --text: #1a1f1c;
  --muted: #5f6a64;
  --border: #e0e4e1;
  --primary: #0f8a5f;
  --primary-hover: #0b7550;
  --primary-text: #ffffff;
  --primary-soft: #e8f4ee;
  --warn-bg: #fff6e0;
  --warn-text: #7a5600;
  --error: #c4321f;
  --high: #0f8a5f;
  --medium: #b06f00;
  --low: #c4321f;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121614;
    --bg-alt: #181d1b;
    --surface: #1b211e;
    --text: #e6ebe8;
    --muted: #9ca8a2;
    --border: #2d3632;
    --primary: #34b984;
    --primary-hover: #49c793;
    --primary-text: #08140f;
    --primary-soft: #1b2f26;
    --warn-bg: #3a2e12;
    --warn-text: #f3d48a;
    --error: #ff8a7a;
    --high: #34b984;
    --medium: #e3a43a;
    --low: #ff8a7a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}
a { color: var(--primary); }
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 16px; }
.narrow-wrap { max-width: 760px; }
.muted { color: var(--muted); }

/* header / footer */
.site-header { border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.logo { color: var(--primary); }
.nav { display: flex; gap: 20px; }
.nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.nav a:hover { color: var(--text); }

.site-footer { border-top: 1px solid var(--border); margin-top: 48px; padding: 20px 0 32px; font-size: .88rem; color: var(--muted); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
.site-footer a { color: var(--muted); }

/* hero + tool */
.hero { padding: 40px 0 24px; text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); line-height: 1.15; margin: 0 0 10px; }
.lede { font-size: 1.1rem; color: var(--muted); max-width: 580px; margin: 0 auto 28px; }

.tool {
  max-width: 820px; margin: 0 auto; text-align: left;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 24px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, .05);
}
@media (max-width: 560px) { .tool { padding: 16px; } }
.fineprint { color: var(--muted); font-size: .85rem; margin: 14px 0 0; }

.dropzone {
  position: relative; text-align: center; padding: 44px 16px 36px;
  border: 2px dashed var(--border); border-radius: 10px; transition: border-color .15s, background .15s;
}
.dropzone.over { border-color: var(--primary); background: var(--primary-soft); }
.dropzone.busy { opacity: .6; pointer-events: none; }
.drop-overlay { display: none; }
body.dragging .drop-overlay {
  display: grid; place-items: center; position: fixed; inset: 0; z-index: 50;
  background: rgba(15, 138, 95, .88); color: #fff; font-size: 1.8rem; font-weight: 700; pointer-events: none;
}
.dz-sub { margin: 12px 0 2px; }
.dz-formats { margin: 0; color: var(--muted); font-size: .88rem; }
.samples { text-align: center; color: var(--muted); font-size: .92rem; margin: 16px 0 0; }

/* buttons & inputs */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 600;
  cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--bg-alt); }
.btn.primary { background: var(--primary); color: var(--primary-text); border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-hover); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-big { padding: 14px 34px; font-size: 1.15rem; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--primary); cursor: pointer; font: inherit; text-decoration: underline; text-underline-offset: 2px; }
.icon-btn { background: none; border: 0; color: var(--muted); cursor: pointer; font-size: 1rem; padding: 6px 8px; }
.icon-btn:hover { color: var(--text); }

input, textarea, select {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text); font: inherit;
}
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--primary); outline-offset: -1px; }
select { width: auto; }

/* workspace */
.file-row { display: flex; align-items: center; gap: 12px; padding: 12px 14px; background: var(--bg-alt); border-radius: 8px; }
.file-icon {
  display: grid; place-items: center; width: 40px; height: 40px; border-radius: 6px; flex: none;
  background: var(--primary); color: var(--primary-text); font-size: .68rem; font-weight: 700;
}
.file-info { flex: 1; min-width: 0; }
.file-info strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-info .muted { font-size: .88rem; }

.step { padding: 22px 0 6px; border-bottom: 1px solid var(--border); }
.step h2 { font-size: 1.05rem; margin: 0 0 6px; }
.hint { color: var(--muted); font-size: .9rem; margin: 0 0 12px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; font-size: .92rem; cursor: pointer;
}
.chip:hover { border-color: var(--primary); }
.chip.on { border-color: var(--primary); background: var(--primary-soft); }
.chip .order:empty { display: none; }
.chip .order { font-size: .78rem; font-weight: 700; color: var(--primary); }
.chip .order::after { content: "."; }
.chip .kind { color: var(--muted); font-size: .75rem; }

.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin: 6px 0 16px; }
.seg-btn { padding: 8px 14px; border: 0; background: var(--surface); color: var(--muted); font: inherit; font-size: .92rem; cursor: pointer; }
.seg-btn + .seg-btn { border-left: 1px solid var(--border); }
.seg-btn.active { background: var(--primary-soft); color: var(--text); font-weight: 600; }

.field { display: block; margin: 0 0 16px; }
.field > span, .field-label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 6px; }
.field.narrow { max-width: 300px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .two-col { grid-template-columns: 1fr; } }
.option { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr) auto; gap: 8px; margin-bottom: 8px; }
@media (max-width: 560px) { .option { grid-template-columns: 1fr auto; } .option .opt-desc { grid-column: 1; } }
.check { display: flex; gap: 8px; align-items: center; margin: 12px 0 16px; font-size: .92rem; }
.check input { width: auto; accent-color: var(--primary); }
.inline { display: inline-flex; gap: 8px; align-items: center; color: var(--muted); }

.review-setting { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 4px 0 16px; }
.review-setting input { width: 72px; text-align: right; }

.run-bar { display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; padding-top: 18px; }
@media (max-width: 560px) { .run-bar .btn { flex: 1; } }
.run-hint { text-align: right; font-size: .85rem; margin: 8px 0 0; }

.warn { background: var(--warn-bg); color: var(--warn-text); padding: 9px 12px; border-radius: 8px; font-size: .9rem; margin: 0 0 16px; }
.error { color: var(--error); margin: 12px 0 0; }

.table-wrap { overflow-x: auto; margin: 16px 0; border: 1px solid var(--border); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: 8px 11px; border-bottom: 1px solid var(--border); vertical-align: top; max-width: 340px; }
th { background: var(--bg-alt); font-weight: 600; white-space: nowrap; }
th.out, td.out { background: var(--primary-soft); }
tr:last-child td { border-bottom: 0; }
.badge { display: inline-block; padding: 0 7px; border-radius: 4px; font-weight: 600; font-size: .82rem; color: #fff; }
.badge.high { background: var(--high); }
.badge.medium { background: var(--medium); }
.badge.low { background: var(--low); }
.flag { color: var(--medium); font-weight: 600; }

.preparing { text-align: center; padding: 24px 0 4px; }
.preparing h3, .done h3 { margin: 0 0 12px; font-size: 1.15rem; }
.bar { height: 8px; background: var(--bg-alt); border-radius: 4px; overflow: hidden; max-width: 480px; margin: 0 auto; }
.bar-fill { height: 100%; width: 0; background: var(--primary); transition: width .4s; }
.preparing p { margin: 8px 0 0; }

.done { text-align: center; padding: 24px 0 4px; }
.done-text { max-width: 540px; margin: 0 auto 18px; }
.done-actions { display: flex; justify-content: center; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }

/* content */
.section { padding: 40px 0 8px; }
.section h2 { font-size: 1.4rem; margin: 32px 0 14px; }
.section h2:first-child { margin-top: 0; }
.how-list { padding-left: 22px; margin: 0 0 20px; }
.how-list li { margin-bottom: 8px; }
.uses { padding-left: 22px; columns: 2; column-gap: 32px; margin: 0; }
.uses li { margin-bottom: 6px; break-inside: avoid; }
.uses-more { margin: 12px 0 0; }
@media (max-width: 560px) { .uses { columns: 1; } }

.faq { border-bottom: 1px solid var(--border); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { color: var(--muted); margin: 8px 0 4px; }

/* ads */
.ad { margin: 24px auto; text-align: center; }
.ad-label { display: block; font-size: .7rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 4px; }
.ad-leaderboard { max-width: 728px; }
.ad-inline { max-width: 760px; }
.ad-interstitial { max-width: 336px; margin: 20px auto 0; }
.ad-placeholder { display: grid; place-items: center; min-height: 90px; border: 1px dashed var(--border); border-radius: 6px; color: var(--muted); font-size: .8rem; background: var(--bg-alt); }
.ad-inline .ad-placeholder { min-height: 250px; }
.ad-interstitial .ad-placeholder { min-height: 280px; }

.prose { max-width: 680px; margin: 40px auto; padding: 0 16px; }
.contact-form { margin: 24px 0 16px; }
.contact-form .btn { margin-top: 4px; }
.cf-turnstile { margin: 0 0 16px; }
.ts-upload { display: flex; justify-content: center; margin: 12px 0 0; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.success-msg { font-weight: 600; color: var(--primary); }
.small { font-size: .85rem; }