:root {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ff4d4f;
  --line: #334155;
  --input: #334155;
  --panel: #1e293b;
  --panel-2: #1e273a;
  --shadow: rgba(0, 0, 0, 0.3);
}

.theme-light {
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ef4444;
  --line: #e2e8f0;
  --input: #ffffff;
  --panel: #f9fafb;
  --panel-2: #f1f5f9;
  --shadow: rgba(0, 0, 0, 0.1);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, sans-serif;
  margin: 0;
  padding: 30px 20px 80px;
  line-height: 1.6;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem 0.5rem;
  flex-wrap: wrap;
}

header h1 {
  font-size: 22px;
  margin: 0;
}

.header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 8px 18px;
  font-size: 14px;
  color: white;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 8px var(--shadow);
  transition: all 0.2s ease-in-out;
}

.btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-danger {
  background: var(--danger);
}

.btn-danger:hover {
  background: #d9363b;
}

main {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

section.block {
  background: var(--card);
  color: var(--text);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 25px;
  box-shadow: 0 8px 16px var(--shadow);
  border: 1px solid var(--line);
  animation: fadeInUp 0.4s ease both;
}

section.block:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(59,130,246,0.15);
}

section.block h2 {
  margin-top: 0;
  font-size: 1.2rem;
  color: var(--accent);
  border-left: 4px solid var(--accent);
  padding-left: 12px;
  margin-bottom: 16px;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--input);
  color: var(--text);
  font-size: 14px;
  box-sizing: border-box;
  margin-bottom: 10px;
  transition: border 0.2s, background 0.2s;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  background: var(--panel);
  outline: none;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.collapsible {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  margin: 16px 0 2rem;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0,0,0,.2);
}

.collapsible .section-toggle {
  padding: 14px 18px;
  background: var(--card);
  color: var(--text);
  border: none;
  width: 100%;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-content {
  display: none;
  padding: 1rem;
}
.section-content.open {
  display: block;
}

footer {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  margin-top: 40px;
}
.signatures-wrap {
  margin-top: 2rem;
  background-color: var(--card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: flex; /* зміна на flex */
  justify-content: space-between; /* або center */
  flex-wrap: wrap;
  gap: 2rem;
}

.signature-box {
  flex: 1 1 320px;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center; /* center замість flex-start */
}

.signature-box h3 {
  margin-bottom: 0.5rem;
}

.signature-box canvas.signature {
  border: 2px solid var(--line);
  border-radius: 8px;
  background-color: white;
  width: 100%;
  aspect-ratio: 3 / 1; /* ✅ Рівні пропорції на всіх екранах */
  max-width: 320px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  touch-action: none; /* 🔧 для мобільних */
}

.signature-box button {
  margin-top: 0.5rem;
  background: var(--accent);
  color: white;
  padding: 6px 14px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.signature-box button:hover {
  background: var(--accent-hover);
}

.signature-box p {
  margin-top: 0.5rem;
  font-size: 13px;
  color: var(--muted);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  body { padding: 15px; }
  header { flex-direction: column; align-items: flex-start; gap: 10px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .actions { justify-content: center; }
}