:root {
  --bg: #ffffff;
  --text: #111827; /* gray-900 */
  --muted: #6b7280; /* gray-500 */
  --link: #1d4ed8; /* blue-700 */
  --link-hover: #1e40af; /* blue-800 */
  --card: #f8fafc; /* slate-50 */
  --border: #e5e7eb; /* gray-200 */
  --accent: #0ea5e9; /* sky-500 */
}

* { box-sizing: border-box; }
html, body { height: 100%;
scroll-padding-top: 100px; }

body {
  margin: 0;
  padding-top: 75px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

@media (max-width: 640px) {
  body {
    padding-top: 150px; /* override for mobile */
  }
  html {scroll-padding-top: 175px;}
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand img {
  width: 72px;
  height: 72px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid var(--border);
  background: #fff;
}
.brand h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 0;
}
.brand .subtitle {
  font-size: 14px;
  color: var(--muted);
  margin: 2px 0 0 0;
}

nav a {
  text-decoration: none;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
}
nav a:hover,
nav a:focus {
  color: var(--link-hover);
  background: var(--card);
  border-color: var(--border);
  outline: none;
}

/* Sections */
main { padding-top: 100px; }
section { padding: 0px 0; }
section h2 {
  font-size: 22px;
  margin: 0 0 12px 0;
  border-bottom: 2px solid var(--border);
  padding-bottom: 6px;
}
p { margin: 0 0 14px 0; }

a { color: var(--link); }
a:hover { color: var(--link-hover); }

/* Cards/Lists */
.list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.item {
  padding: 14px 16px;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 12px;
}
.item b { display: inline-block; margin-bottom: 4px; }
.meta { color: var(--muted); font-size: 14px; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
}

/* Small screens */
@media (max-width: 640px) {
  .brand img { width: 56px; height: 56px; }
  .brand h1 { font-size: 22px; }
}