/* ==============================================
   SudoTool Design System
   Theme: GitHub-inspired
   ============================================== */

/* 1. Design Tokens */
:root {
  --color-bg:            #ffffff;
  --color-bg-subtle:     #f6f8fa;
  --color-bg-muted:      #eef1f4;
  --color-border:        #d0d7de;
  --color-text:          #1f2328;
  --color-text-muted:    #656d76;
  --color-accent:        #0969da;
  --color-accent-hover:  #0550ae;
  --color-accent-subtle: #dbeafe;

  --font-ui:   'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --nav-height: 56px;
  --max-width:  1200px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

/* 2. Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; }

/* 3. Base */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-ui);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 4. Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 56px 0;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

/* 5. Navigation */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 16px;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo-prefix {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-links a {
  font-size: 14px;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
}

.nav-cta {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-bg) !important;
  background: var(--color-accent) !important;
  padding: 6px 14px !important;
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s;
}

.nav-cta:hover {
  background: var(--color-accent-hover) !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  color: var(--color-text);
}

.nav-toggle svg {
  display: block;
}

/* 6. Footer */
.site-footer {
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-muted);
}

.footer-logo .accent {
  color: var(--color-accent);
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 13px;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-copy {
  width: 100%;
  font-size: 12px;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin-top: 8px;
}

/* 7. Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--color-accent);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid var(--color-accent);
  cursor: pointer;
  transition: background 0.15s;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg-subtle);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background 0.15s;
}

.btn-secondary:hover {
  background: var(--color-bg-muted);
}

/* 8. Cards */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.card {
  display: block;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  background: var(--color-bg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.card-icon {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--color-accent);
  margin-bottom: 12px;
  line-height: 1;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.card-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.card-tag {
  display: inline-block;
  margin-top: 12px;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  padding: 2px 8px;
  border-radius: 20px;
}

/* Blog card variant */
.card-blog .card-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

/* 9. Section Header */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-title {
  font-size: 17px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

.section-link {
  font-size: 13px;
  color: var(--color-accent);
  text-decoration: none;
}

.section-link:hover {
  text-decoration: underline;
}

/* 10. Hero */
.hero {
  padding: 80px 0 64px;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid #bfdbfe;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.hero h1 .accent {
  font-family: var(--font-mono);
  color: var(--color-accent);
}

.hero p {
  font-size: 17px;
  color: var(--color-text-muted);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* 11. Page Hero (inner pages) */
.page-hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}

.page-hero h1 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
}

.page-hero p {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 520px;
}

/* 12. Forms */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
}

.form-input,
.form-textarea {
  width: 100%;
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

/* 13. Prose (blog / policy pages) */
.prose {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.prose h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 40px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 24px 0 8px;
}

.prose p { margin-bottom: 16px; }

.prose ul, .prose ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.prose li { margin-bottom: 6px; }

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* 14. Utilities */
.mono       { font-family: var(--font-mono); }
.text-muted { color: var(--color-text-muted); }
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

/* 15. 404 */
.not-found {
  text-align: center;
  padding: 80px 24px;
}

.not-found-code {
  font-family: var(--font-mono);
  font-size: 80px;
  font-weight: 600;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: 16px;
}

.not-found h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.not-found p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

/* -----------------------------------------------
   Responsive
----------------------------------------------- */

/* Tablet */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 34px; }
}

/* Mobile */
@media (max-width: 768px) {
  .container { padding: 0 16px; }

  /* Nav */
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 12px 16px;
    gap: 4px;
  }

  .nav-links.open { display: flex; }

  .nav-cta { display: none; }

  /* Hero */
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 15px; }

  /* Grid */
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }

  /* Section */
  .section { padding: 40px 0; }

  /* Footer */
  .footer-inner { flex-direction: column; align-items: flex-start; }

  /* Page hero */
  .page-hero h1 { font-size: 22px; }
}