:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

.container { width: 100%; max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { background: var(--card); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 1.2rem; text-decoration: none; color: var(--text); }
.logo-mark { margin-right: 4px; }
.nav a { margin-left: 22px; text-decoration: none; color: var(--muted); font-weight: 500; }
.nav a:hover { color: var(--brand); }

/* Hero */
.hero { padding: 56px 0 40px; text-align: center; }
.hero h1 { font-size: 2.4rem; margin: 0 0 10px; }
.subtitle { color: var(--muted); font-size: 1.1rem; margin: 0 0 32px; }

/* Converter card */
.converter { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: 0 8px 30px rgba(0,0,0,.05); text-align: left; }

.dropzone { border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 36px 20px; text-align: center; transition: .15s; cursor: pointer; background: #fafbff; }
.dropzone.dragover { border-color: var(--brand); background: #eef3ff; }
.dz-icon { font-size: 2rem; }
.dropzone .hint { color: var(--muted); font-size: .85rem; margin-top: 6px; }
.link-btn { background: none; border: none; color: var(--brand); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }

.file-list { list-style: none; margin: 14px 0 0; padding: 0; }
.file-list li { font-size: .85rem; color: var(--muted); padding: 2px 0; }

.url-row { margin-top: 16px; }
.url-row input { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: .95rem; }

.options { display: flex; flex-wrap: wrap; gap: 14px; align-items: end; margin-top: 18px; }
.options label { display: flex; flex-direction: column; font-size: .8rem; color: var(--muted); font-weight: 600; gap: 4px; }
.options select { padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: .95rem; min-width: 160px; }

.btn-primary { margin-left: auto; background: var(--brand); color: #fff; border: none; padding: 11px 22px;
  border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.status { margin-top: 18px; padding: 12px 14px; border-radius: 8px; font-size: .9rem; }
.status.loading { background: #eff6ff; color: var(--brand-dark); }
.status.error { background: #fef2f2; color: #b91c1c; }

.result-wrap { margin-top: 22px; }
.result-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.result-label { font-weight: 600; }
.result-actions { display: flex; gap: 8px; }
.btn-sm { background: #f1f5f9; border: 1px solid var(--border); border-radius: 6px; padding: 6px 12px;
  font-size: .85rem; cursor: pointer; font-weight: 600; }
.btn-sm:hover { background: #e2e8f0; }
.result-text { width: 100%; min-height: 240px; padding: 14px; border: 1px solid var(--border);
  border-radius: 8px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; resize: vertical; }

/* Sections */
.section { padding: 48px 0; }
.section.alt { background: var(--card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: 1.6rem; margin: 0 0 22px; }
.steps { padding-left: 20px; }
.steps li { margin-bottom: 8px; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.feature { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.feature h3 { margin: 0 0 6px; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--muted); font-size: .92rem; }

.faq details { border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; margin-bottom: 10px; background: var(--card); }
.faq summary { font-weight: 600; cursor: pointer; }
.faq p { color: var(--muted); margin: 10px 0 0; }

/* Footer */
.site-footer { background: var(--card); border-top: 1px solid var(--border); padding: 24px 0; margin-top: 20px; }
.site-footer p { color: var(--muted); font-size: .88rem; margin: 0; text-align: center; }

/* Guides / articles */
.article-list { display: grid; gap: 18px; margin-top: 24px; }
.article-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; }
.article-card h2 { margin: 0 0 4px; font-size: 1.25rem; }
.article-card h2 a { text-decoration: none; color: var(--text); }
.article-card h2 a:hover { color: var(--brand); }
.article-card .meta { color: var(--muted); font-size: .82rem; margin: 0 0 8px; }
.read-more { color: var(--brand); font-weight: 600; text-decoration: none; }

.article-body { max-width: 760px; }
.article-body .meta { color: var(--muted); font-size: .85rem; }
.prose { font-size: 1.05rem; line-height: 1.7; }
.prose h2 { margin-top: 1.8em; font-size: 1.4rem; }
.prose h3 { margin-top: 1.4em; font-size: 1.15rem; }
.prose ul, .prose ol { padding-left: 22px; }
.prose code { background: #f1f5f9; padding: 1px 5px; border-radius: 4px; font-size: .9em; }
.prose table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }

.cta-box { margin-top: 36px; padding: 24px; background: #eef3ff; border: 1px solid #dbeafe;
  border-radius: var(--radius); text-align: center; }
.cta-box h3 { margin: 0 0 6px; }

/* Per-converter on-page content */
.content-section { padding: 40px 0; }
.content-section .prose { max-width: 760px; margin: 0 auto; }
.tool-faq { max-width: 760px; margin: 24px auto 0; }

/* Queue / waiting page */
.queue-box { text-align: center; padding: 28px 0; }
.spinner { width: 44px; height: 44px; margin: 0 auto 16px; border: 4px solid var(--border);
  border-top-color: var(--brand); border-radius: 50%; animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.lane-note { color: var(--brand-dark); font-weight: 600; }

.upsell { margin-top: 18px; padding: 22px; border: 1px solid #fcd34d; background: #fffbeb;
  border-radius: var(--radius); text-align: center; }
.upsell h3 { margin: 0 0 6px; }
.upsell .balance { color: var(--muted); font-size: .9rem; margin: 10px 0; }
.upsell .btn-primary { margin: 4px; display: inline-block; }
.upsell-msg { color: #b45309; font-weight: 600; margin-top: 10px; }

/* Tool cards (converter index + homepage) */
.tool-card { display: block; text-decoration: none; color: inherit; position: relative; transition: .15s; }
.tool-card:hover { border-color: var(--brand); box-shadow: 0 6px 20px rgba(37,99,235,.08); }
.tool-card h3 { color: var(--text); }
.tool-card p { color: var(--muted); }
.badge { position: absolute; top: 12px; right: 12px; background: #fef3c7; color: #b45309;
  font-size: .68rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; text-transform: uppercase; }
.coming-soon { text-align: center; padding: 28px 10px; }
.coming-soon h3 { margin: 0 0 8px; }
/* Highlight the recommended download format on a converter page */
.download-btn.btn-primary { color: #fff; }

@media (max-width: 600px) {
  .hero h1 { font-size: 1.8rem; }
  .btn-primary { margin-left: 0; width: 100%; }
  .options { flex-direction: column; align-items: stretch; }
}