:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e5e7eb;
  --brand:#2563eb;
  --brand2:#1d4ed8;
  --ok:#16a34a;
  --shadow: 0 12px 30px rgba(15, 23, 42, .08);
  --radius:16px;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, Helvetica, sans-serif;
  background:var(--bg);
  color:var(--text);
}

a{color:inherit}
.container{max-width:1100px;margin:0 auto;padding:22px}

.topbar{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:10;
}

.topbar .inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  text-decoration:none;
}
.logo{
  width:34px;height:34px;border-radius:12px;
  background:linear-gradient(135deg,var(--brand),#22c55e);
  box-shadow:0 8px 20px rgba(37,99,235,.25);
}

.nav{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  align-items:center;
}
.nav a{
  text-decoration:none;
  color:var(--muted);
  font-weight:700;
  font-size:14px;
}
.nav a:hover{color:var(--text)}

.hero{
  padding:28px 0 10px;
}

.hero-grid{
  display:grid;
  grid-template-columns: 1.3fr .9fr;
  gap:18px;
  align-items:stretch;
}

@media (max-width: 900px){
  .hero-grid{grid-template-columns:1fr}
}

.h-title{
  font-size:38px;
  line-height:1.1;
  margin:0 0 10px;
  letter-spacing:-.02em;
}
.h-sub{
  margin:0 0 14px;
  color:var(--muted);
  line-height:1.6;
  font-size:15px;
}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.converter{
  padding:18px;
}

.dropzone{
  border:2px dashed #cbd5e1;
  border-radius:18px;
  padding:18px;
  background:linear-gradient(180deg,#ffffff 0%, #f8fafc 100%);
  transition:.15s;
}
.dropzone.dragover{
  border-color:var(--brand);
  background:rgba(37,99,235,.06);
}

.drop-head{
  display:flex;
  gap:12px;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  padding:12px 10px 6px;
  text-align:center;
}
.drop-icon{
  width:52px;height:52px;border-radius:16px;
  background:rgba(37,99,235,.10);
  display:flex;align-items:center;justify-content:center;
  border:1px solid rgba(37,99,235,.18);
}
.drop-icon svg{width:28px;height:28px}

.file-actions{
  display:flex;
  gap:10px;
  align-items:center;
  justify-content:center;
  margin-top:10px;
  flex-wrap:wrap;
}

.btn{
  appearance:none;
  border:none;
  border-radius:14px;
  padding:12px 14px;
  font-weight:800;
  cursor:pointer;
  transition:.15s;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:14px;
}
.btn-primary{
  background:var(--brand);
  color:#fff;
  box-shadow:0 12px 22px rgba(37,99,235,.22);
}
.btn-primary:hover{background:var(--brand2)}
.btn-ghost{
  background:#fff;
  color:var(--text);
  border:1px solid var(--line);
}
.btn-ghost:hover{background:#f8fafc}

.input-hidden{display:none}

.controls{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:12px;
  margin-top:14px;
}
@media (max-width: 680px){
  .controls{grid-template-columns:1fr}
}

.field label{
  display:block;
  font-size:12px;
  color:var(--muted);
  margin:0 0 6px;
  font-weight:800;
}
select{
  width:100%;
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px 12px;
  background:#fff;
  font-weight:700;
}

.preview{
  margin-top:12px;
  display:none;
}
.preview.show{display:block}
.preview-grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:10px;
  margin-top:10px;
}
@media (max-width: 680px){
  .preview-grid{grid-template-columns: repeat(2, 1fr)}
}
.thumb{
  border:1px solid var(--line);
  border-radius:14px;
  overflow:hidden;
  background:#fff;
}
.thumb img{
  width:100%;
  height:120px;
  object-fit:cover;
  display:block;
}
.thumb .meta{
  padding:8px 10px;
  font-size:12px;
  color:var(--muted);
  display:flex;
  justify-content:space-between;
  gap:8px;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:12px;
  font-weight:800;
  color:var(--ok);
}

.rightbox{
  padding:18px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.list{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.list li{
  display:flex;
  gap:10px;
  align-items:flex-start;
  color:var(--muted);
  line-height:1.5;
  font-size:14px;
}
.check{
  width:18px;height:18px;border-radius:6px;
  background:rgba(22,163,74,.12);
  border:1px solid rgba(22,163,74,.22);
  display:inline-flex;align-items:center;justify-content:center;
  flex:0 0 auto;
  margin-top:2px;
}

.notice{
  margin-top:10px;
  font-size:12px;
  color:var(--muted);
  line-height:1.5;
}
.notice a{color:var(--brand); text-decoration:none; font-weight:800}
.notice a:hover{text-decoration:underline}

.section{
  margin-top:18px;
}
.section h2{
  margin:0 0 10px;
  font-size:20px;
  letter-spacing:-.01em;
}
.features{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:12px;
}
@media (max-width: 900px){
  .features{grid-template-columns:1fr}
}
.feature{
  padding:14px;
}
.feature h3{margin:0 0 6px;font-size:16px}
.feature p{margin:0;color:var(--muted);line-height:1.6;font-size:14px}

.faq{
  display:grid;
  gap:10px;
}
details{
  border:1px solid var(--line);
  border-radius:14px;
  background:#fff;
  padding:12px 14px;
}
summary{
  cursor:pointer;
  font-weight:900;
}
details p{color:var(--muted);margin:10px 0 0;line-height:1.6}

.flash{
  margin-bottom:12px;
  border-radius:14px;
  padding:12px 14px;
  border:1px solid var(--line);
  background:#fff;
}
.flash.ok{border-color:rgba(22,163,74,.25); background:rgba(22,163,74,.06)}
.flash.err{border-color:rgba(239,68,68,.25); background:rgba(239,68,68,.06)}

.footer{
  margin-top:20px;
  padding:18px 0;
  color:var(--muted);
  font-size:12px;
}
.footer .links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:8px;
}
.footer a{color:var(--muted);text-decoration:none;font-weight:800}
.footer a:hover{color:var(--text)}

.cookie-consent {
  position: fixed;
  bottom: 20px;
  left: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  justify-content: center;
}

.cookie-consent.hidden {
  display: none;
}

.cookie-box {
  background: #ffffff;
  border-radius: 12px;
  padding: 16px 18px;
  max-width: 960px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0,0,0,.12);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cookie-box p {
  font-size: 14px;
  line-height: 1.6;
  color: #374151;
}

.cookie-box a {
  color: var(--brand);
  font-weight: 600;
  text-decoration: none;
}

.cookie-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

@media (max-width: 600px) {
  .cookie-actions {
    flex-direction: column;
  }
}