:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Segoe UI", Roboto, sans-serif;
  background-color: var(--slate-100);
  color: var(--slate-800);
  line-height: 1.5;
  padding: 1rem 0.5rem 3rem;
}

.contract-wrapper {
  max-width: 760px;
  margin: 0 auto;
  background: white;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  border: 1px solid var(--slate-200);
}

.contract-header {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: white;
  padding: 1.5rem;
  text-align: center;
}

.contract-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.contract-header p {
  font-size: 0.85rem;
  color: var(--slate-400);
}

.contract-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.section-card {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: 12px;
  padding: 1.25rem;
}

.section-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pdf-preview-box {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--slate-300);
  background: #525659;
}

.pdf-preview-box embed,
.pdf-preview-box iframe {
  width: 100%;
  height: 480px;
  border: none;
  display: block;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--slate-700);
}

.input-label .required-mark {
  color: #ef4444;
  margin-left: 2px;
}

.input-field {
  padding: 0.75rem 0.9rem;
  font-size: 0.95rem;
  border: 1.5px solid var(--slate-300);
  border-radius: 8px;
  color: var(--slate-900);
  background: white;
  transition: all 0.15s ease;
  width: 100%;
}

.input-field:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Signature Pad */
.signature-box {
  background: white;
  border: 1.5px dashed var(--slate-300);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
  touch-action: none; /* Essential for mobile drawing */
}

.signature-box canvas {
  width: 100%;
  height: 200px;
  display: block;
  cursor: crosshair;
}

.sig-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
}

.sig-guide {
  font-size: 0.775rem;
  color: var(--slate-500);
}

.btn-clear {
  background: var(--slate-100);
  color: var(--slate-600);
  border: 1px solid var(--slate-300);
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-clear:hover {
  background: var(--slate-200);
  color: var(--slate-900);
}

.btn-submit {
  width: 100%;
  padding: 1rem;
  font-size: 1.05rem;
  font-weight: 700;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.25);
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

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

.btn-submit:disabled {
  background: var(--slate-400);
  cursor: not-allowed;
}

/* Completion Page */
.success-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.success-icon-wrap {
  width: 64px;
  height: 64px;
  background: #dcfce7;
  color: #16a34a;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.success-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--slate-900);
}

.success-desc {
  font-size: 0.9rem;
  color: var(--slate-600);
  max-width: 450px;
}