:root {
  --bg: #0f1419;
  --card: #1a2332;
  --line: #2a3a4f;
  --text: #e8eef6;
  --muted: #93a4bb;
  --accent: #3d8bfd;
  --accent-hover: #5aa0ff;
  --danger: #f07178;
  --ok: #7fd99a;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #1d2b44 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
}

.page {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header h1 {
  margin: 0 0 6px;
  font-size: 1.8rem;
}

header p {
  margin: 0 0 24px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

input, select {
  background: #121a26;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.95rem;
}

input:focus, select:focus {
  outline: 2px solid #3d8bfd55;
  border-color: var(--accent);
}

.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  color: var(--text);
  margin-top: 22px;
}

.checkbox input { width: auto; }

.full { grid-column: 1 / -1; }

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab {
  background: #121a26;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
}

.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.hidden { display: none !important; }

.actions {
  display: flex;
  gap: 12px;
  margin: 8px 0 24px;
}

button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 1rem;
  cursor: pointer;
}

button:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.6; cursor: wait; }

.ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
}

.ghost:hover { background: #121a26; }

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.result-head h2 { margin: 0; }

.result-message {
  margin: 0 0 12px;
  color: var(--muted);
}

.result pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  background: #121a26;
  padding: 14px;
  border-radius: 8px;
  font-size: 0.85rem;
}

.download {
  background: var(--ok);
  color: #0f1419;
  text-decoration: none;
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 600;
}

.pdf-preview {
  width: 100%;
  min-height: 640px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #121a26;
}

.result.ok { border-color: var(--ok); }
.result.err { border-color: var(--danger); }

@media (max-width: 700px) {
  .grid { grid-template-columns: 1fr; }
  .checkbox { margin-top: 0; }
}