:root {
  --primary: #145d91;
  --primary-hover: #3776ab;
  --bg: #f7f9ff;
  --surface: #ffffff;
  --text: #001d32;
  --text-muted: #41474f;
  --border: #e2e8f0;
  --success-bg: #ebffd5;
  --success-text: #316600;
  --error-bg: #ffdad6;
  --error-text: #ba1a1a;
  
  --font-sans: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  padding: 48px 24px;
}

.container { max-width: 800px; margin: 0 auto; }

header { text-align: center; margin-bottom: 40px; }
h1 {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 44px;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.subtitle { color: var(--text-muted); font-size: 16px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  box-shadow: 0 4px 12px rgba(31, 66, 94, 0.08);
}
h2 {
  font-size: 20px;
  font-weight: 600;
  line-height: 28px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.info-item { background: #f8fafc; padding: 16px; border-radius: 4px; font-size: 14px; border: 1px solid var(--border); }

.tabs { display: flex; gap: 8px; margin-bottom: 24px; border-bottom: 1px solid var(--border); }
.tab {
  padding: 10px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  color: var(--text-muted);
  transition: all 0.2s ease;
}
.tab:hover { color: var(--text); background: rgba(20, 93, 145, 0.05); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.input-group { margin-bottom: 16px; }
.input-group.row { display: flex; gap: 16px; }
.col { flex: 1; }
label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  line-height: 16px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--text-muted);
}
input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
  background-color: #f8fafc;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(20, 93, 145, 0.15); }

.action-btn {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}
.action-btn:hover { background: var(--primary-hover); }
.action-btn:active { transform: scale(0.98); }

.result-panel {
  margin-top: 24px;
  padding: 16px;
  border-radius: 4px;
  border: 1px solid var(--border);
  display: none;
}
.result-panel.show { display: block; animation: slideDown 0.3s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

.success { background: var(--success-bg); color: var(--success-text); padding: 12px; border-radius: 4px; margin-bottom: 8px; font-size: 14px; }
.error { background: var(--error-bg); color: var(--error-text); padding: 12px; border-radius: 4px; margin-bottom: 8px; font-size: 14px; }
.meta { font-size: 12px; color: var(--text-muted); text-align: center; }
code { background: #f8fafc; padding: 2px 4px; border-radius: 4px; font-family: var(--font-mono); font-size: 12px; border: 1px solid var(--border); }

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

footer {
  text-align: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}
footer a { color: var(--primary); text-decoration: none; font-weight: 600; }
footer a:hover { text-decoration: underline; }
footer p { margin-bottom: 8px; }