:root {
  --red-900: #6b1414;
  --red-700: #a3221f;
  --orange-500: #e08a3c;
  --slate-900: #1c1e21;
  --slate-600: #52565c;
  --slate-300: #d8dadd;
  --slate-100: #f6f5f4;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 2px 10px rgba(28, 30, 33, 0.08);
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--slate-900);
  background: var(--white);
  line-height: 1.6;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

a {
  color: var(--red-700);
}

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

/* header / nav */
.site-header {
  border-bottom: 1px solid var(--slate-300);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--red-700);
  text-decoration: none;
}

.brand-logo {
  height: 60px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--slate-900);
  text-decoration: none;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--red-700);
}

.nav-github {
  color: var(--red-700) !important;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  border: 1px solid var(--slate-300);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 8px;
  min-width: 200px;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
}

.nav-dropdown-menu a:hover {
  background: var(--slate-100);
}

/* hero */
.hero {
  padding: 80px 0 56px;
  text-align: center;
}

.hero-logo {
  height: 300px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 2.6rem;
  margin: 0 0 12px;
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--slate-600);
  max-width: 640px;
  margin: 0 auto 32px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

.btn-primary {
  background: var(--red-700);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--red-900);
}

.btn-secondary {
  background: var(--slate-100);
  color: var(--slate-900);
  border: 1px solid var(--slate-300);
}

.btn-secondary:hover {
  border-color: var(--red-700);
  color: var(--red-700);
}

/* status banner */
.status-banner {
  background: var(--slate-100);
  border: 1px solid var(--slate-300);
  border-radius: var(--radius);
  padding: 14px 20px;
  margin: 0 auto 48px;
  max-width: 720px;
  text-align: center;
  font-size: 0.95rem;
}

.status-banner strong {
  color: var(--red-700);
}

/* page header (non-home pages) */
.page-header {
  padding: 56px 0 24px;
}

.page-header h1 {
  font-size: 2.2rem;
  margin: 0 0 8px;
}

/* sections */
section {
  padding: 40px 0;
}

section h2 {
  font-size: 1.7rem;
  margin-bottom: 8px;
}

section p.lead {
  color: var(--slate-600);
  margin-top: 0;
  margin-bottom: 28px;
  max-width: 720px;
}

/* feature grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: var(--white);
  border: 1px solid var(--slate-300);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.card h3 {
  margin-top: 0;
  color: var(--red-700);
}

.link-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.link-card {
  display: block;
  border: 1px solid var(--slate-300);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
}

.link-card:hover {
  border-color: var(--red-700);
}

.link-card h3 {
  color: var(--red-700);
  margin: 0 0 8px;
}

.link-card p {
  margin: 0;
  color: var(--slate-600);
}

/* feature list (why.html) */
ul.feature-list {
  padding-left: 20px;
}

ul.feature-list li {
  margin-bottom: 16px;
}

/* tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

th,
td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--slate-300);
  vertical-align: top;
}

th {
  background: var(--slate-100);
}

/* code blocks */
pre {
  background: var(--slate-900);
  color: var(--slate-100);
  padding: 18px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.9rem;
}

p code,
li code,
td code,
th code {
  background: var(--slate-100);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* milestone / timeline (journey page) */
.milestone {
  border-left: 3px solid var(--orange-500);
  padding-left: 24px;
  margin-bottom: 40px;
}

.milestone h3 {
  color: var(--red-700);
  margin-bottom: 4px;
}

.milestone .badge {
  display: inline-block;
  background: var(--slate-100);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 0.8rem;
  color: var(--slate-600);
  margin-left: 8px;
  font-weight: normal;
}

footer.site-footer {
  border-top: 1px solid var(--slate-300);
  padding: 32px 0;
  margin-top: 48px;
  text-align: center;
  color: var(--slate-600);
  font-size: 0.9rem;
}

/* responsive */
@media (max-width: 720px) {
  .nav-links {
    gap: 16px;
    font-size: 0.9rem;
  }
  .brand-logo {
    height: 26px;
  }
  .card-grid,
  .link-card-grid {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2rem;
  }
}