:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2330;
  --border: #2a3240;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #3b82f6;
  --accent-2: #2563eb;
  --ok: #22c55e;
  --err: #ef4444;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #16233b, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.site-header { text-align: center; margin-bottom: 28px; }
.brand { display: inline-block; margin-bottom: 14px; }
.brand-logo {
  height: 54px; width: auto; max-width: 260px;
  background: #fff; padding: 8px 14px; border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}
.logo { font-size: 28px; font-weight: 800; letter-spacing: 0.5px; }
.tagline { color: var(--muted); margin-top: 6px; font-size: 15px; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}

h1 { margin: 0 0 6px; font-size: 22px; }
.muted { color: var(--muted); font-size: 14px; line-height: 1.6; }
.muted.small { font-size: 12.5px; margin: 8px 0 0; }
.notice {
  margin: 12px 0 0; padding: 10px 12px; border-radius: 10px;
  background: rgba(59,130,246,.12); border: 1px solid rgba(59,130,246,.35);
  color: #93c5fd; font-size: 13.5px;
}
.site-footer a { color: var(--muted); }

.dropzone {
  margin: 20px 0;
  border: 2px dashed var(--border);
  border-radius: 14px;
  background: var(--panel-2);
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone.dragover { border-color: var(--accent); background: #1a2740; }
.dz-icon { font-size: 34px; opacity: .8; }
.dz-text { margin-top: 10px; color: var(--muted); line-height: 1.5; }
.file-meta { margin-top: 12px; font-weight: 600; color: var(--text); }

.link-btn {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font-size: inherit; padding: 0; text-decoration: underline;
}

.field { display: block; margin: 16px 0; }
.field span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font-size: 14px;
}

.btn {
  display: inline-block; padding: 11px 18px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none;
  transition: background .15s, opacity .15s;
}
.btn:hover { background: #232c3a; }
.btn.primary { background: var(--accent); border-color: var(--accent-2); color: #fff; }
.btn.primary:hover { background: var(--accent-2); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
#uploadBtn { width: 100%; margin-top: 6px; }

.progress-wrap { margin-top: 20px; }
.progress-bar { height: 12px; background: var(--panel-2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), #60a5fa); transition: width .2s; }
.progress-meta { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-top: 8px; }

.result {
  margin-top: 24px; padding: 20px; border-radius: 14px;
  background: var(--panel-2); border: 1px solid var(--border);
}
.result h2 { margin: 0 0 8px; font-size: 18px; color: var(--ok); }
.link-row { display: flex; gap: 8px; margin: 14px 0; }
.link-row input {
  flex: 1; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 13px;
}
.conv-status { font-size: 14px; color: var(--muted); margin: 12px 0; }

.error-box {
  margin-top: 18px; padding: 12px 14px; border-radius: 10px;
  background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.4); color: #fca5a5;
  font-size: 14px;
}

.hidden { display: none !important; }

.site-footer { text-align: center; color: var(--muted); font-size: 13px; margin-top: 30px; }