:root {
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --surface-color: #ffffff;
    --border-color: #cbd5e1;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --success: #15803d;
    --warning: #b45309;
    --font-sans: system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

header {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

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

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

.hero, .tool-surface, .educational-content, .troubleshooting {
    margin: 3rem 0;
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

h1, h2, h3 {
    margin-bottom: 1rem;
    line-height: 1.2;
}

h2 { border-bottom: 2px solid var(--border-color); padding-bottom: 0.5rem; }
h3 { margin-top: 2rem; }

p, ul {
    margin-bottom: 1.5rem;
}

ul {
    padding-left: 2rem;
}

li { margin-bottom: 0.5rem; }
code { font-family: var(--font-mono); background: var(--bg-color); padding: 0.2rem 0.4rem; border-radius: 4px; }

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

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

textarea {
    width: 100%;
    height: 300px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    resize: vertical;
    background: var(--bg-color);
}

textarea:focus {
    outline: 2px solid var(--primary);
    border-color: transparent;
}

.tool-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    cursor: pointer;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s;
}

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

.btn-primary:hover { background: var(--primary-hover); }
.btn:hover:not(.btn-primary) { background: var(--bg-color); }
.btn-small { padding: 0.4rem 0.8rem; font-size: 0.875rem; }

.hidden { display: none !important; }

.error-banner {
    background: var(--error-bg);
    color: var(--error-text);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    border: 1px solid #fecaca;
}

.results {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    overflow: hidden;
}

.results-header {
    padding: 1rem;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.summary {
    padding: 1rem;
    font-weight: 500;
    border-bottom: 1px dashed var(--border-color);
}

.diff-viewer {
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    white-space: pre-wrap;
    overflow-x: auto;
}

.diff-line { padding: 0.1rem 0.5rem; }
.diff-added { background: #dcfce7; color: var(--success); }
.diff-removed { background: #fee2e2; color: var(--error-text); }
.diff-changed { background: #fef3c7; color: var(--warning); }

footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

.footer-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
}

@media (max-width: 768px) {
    .tool-grid { grid-template-columns: 1fr; }
}


/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}