:root {
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --nav-bg: rgba(255, 255, 255, 0.8);
  --del-bg: #fee2e2;
  --del-text: #991b1b;
  --ins-bg: #dcfce7;
  --ins-text: #166534;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --card-bg: #1e293b;
  --border-color: #334155;
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --nav-bg: rgba(30, 41, 59, 0.8);
  --del-bg: #7f1d1d;
  --del-text: #fca5a5;
  --ins-bg: #14532d;
  --ins-text: #86efac;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav {
  display: flex;
  align-items: center;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

nav a:hover, nav a.active {
  color: var(--primary-color);
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  font-size: 1.25rem;
  margin-left: 1.5rem;
  transition: transform 0.2s ease;
}

.theme-toggle:hover {
  transform: scale(1.1);
}

main {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.hero {
  text-align: center;
  padding: 4rem 1rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(to right, var(--primary-color), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: #64748b;
  max-width: 600px;
  margin: 0 auto;
}

[data-theme="dark"] .hero p {
  color: #94a3b8;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  border-color: var(--primary-color);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: #64748b;
}

[data-theme="dark"] .card p {
  color: #94a3b8;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

label {
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

textarea {
  width: 100%;
  height: 350px;
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background-color: var(--card-bg);
  color: var(--text-color);
  font-family: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
  resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}

textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  background-color: var(--primary-color);
  color: #ffffff;
  font-weight: 600;
  padding: 0.75rem 2.5rem;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  font-size: 1rem;
}

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

.btn:active {
  transform: scale(0.98);
}

.diff-container {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-top: 2rem;
  box-shadow: var(--shadow);
  overflow-x: auto;
  animation: fadeIn 0.5s ease;
}

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

.diff-pre {
  font-family: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.5;
  font-size: 0.9rem;
}

.diff-ins {
  background-color: var(--ins-bg);
  color: var(--ins-text);
  padding: 0.2rem 0;
}

.diff-del {
  background-color: var(--del-bg);
  color: var(--del-text);
  text-decoration: line-through;
  padding: 0.2rem 0;
}

.diff-eq {
  color: var(--text-color);
}

footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
  font-size: 0.875rem;
  color: #64748b;
}

[data-theme="dark"] footer {
  color: #94a3b8;
}

.htmx-indicator {
  display: none;
  font-weight: 500;
  color: var(--primary-color);
}
.htmx-request .htmx-indicator {
  display: inline;
}
.htmx-request.htmx-indicator {
  display: inline;
}
.page-header {
  margin-bottom: 2rem;
  text-align: center;
}
.page-header h2 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}
.page-header p {
  color: #64748b;
}
[data-theme="dark"] .page-header p {
  color: #94a3b8;
}

.options-group {
  grid-column: 1 / -1;
  margin-top: -0.5rem;
}

.radio-options {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.5rem;
}

.radio-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: normal;
  cursor: pointer;
}

.table-container {
  padding: 0;
  overflow: auto;
  border-radius: 0.5rem;
  animation: fadeIn 0.5s ease;
}

.diff-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-table td {
  padding: 0.15rem 0.5rem;
  vertical-align: top;
}

.diff-table .diff-num {
  width: 1%;
  text-align: right;
  color: #94a3b8;
  background-color: var(--bg-color);
  user-select: none;
  min-width: 45px;
  border-right: 1px solid var(--border-color);
}
[data-theme="dark"] .diff-table .diff-num {
  color: #64748b;
}

.diff-table .diff-text {
  width: 49%;
}

.inline-view .diff-text {
  width: auto;
}

.diff-table pre {
  margin: 0;
  font-family: inherit;
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-del {
  background-color: var(--del-bg);
  color: var(--del-text);
}

.diff-ins {
  background-color: var(--ins-bg);
  color: var(--ins-text);
}

@media (max-width: 768px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  header {
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
  }
  nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
  nav a {
    margin-left: 0;
  }
}