/* ==============================================
   Cobalt Blueprint Design System
   Inspired by makingsoftware.com — Dan Hollick
   ============================================== */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* --- Cobalt Palette (hex approximations of OKLCH) --- */
:root {
  --cobalt-50:  #f4f7fc;
  --cobalt-100: #e3ebf6;
  --cobalt-200: #c0d3ea;
  --cobalt-300: #9cbbdd;
  --cobalt-400: #6b9aca;
  --cobalt-500: #4a7bc5;
  --cobalt-600: #315aa0;
  --cobalt-700: #1d3b6e;
  --bg:         #fbfbfb;
  --fg:         #171717;
  --max-width:  680px;
  --content-pad: 2rem;
}

/* --- Graph-Paper Background --- */
body {
  background-color: var(--bg);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, var(--cobalt-100) 19px, var(--cobalt-100) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, var(--cobalt-100) 19px, var(--cobalt-100) 20px);
  background-size: 20px 20px;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1, h2, h3 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--cobalt-700);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }

p {
  margin-bottom: 1.25rem;
  color: #333;
}

a {
  color: var(--cobalt-600);
  text-decoration: none;
  border-bottom: 1px solid var(--cobalt-200);
  transition: border-color 0.2s;
}
a:hover {
  border-bottom-color: var(--cobalt-500);
}

/* --- Layout --- */
.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem var(--content-pad) 3rem;
}

/* --- Navigation --- */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0 2rem;
  position: relative;
}

.nav-logo {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cobalt-500);
  border-bottom: none;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--cobalt-600);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.nav-links a:hover {
  border-bottom-color: var(--cobalt-400);
}
.nav-links a.active {
  border-bottom-color: var(--cobalt-600);
}

/* Decorative nav underline (blueprint style) */
nav::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--cobalt-200) 0px,
    var(--cobalt-200) 4px,
    transparent 4px,
    transparent 8px
  );
}

/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.hero svg {
  width: 100%;
  max-width: 500px;
  height: auto;
  margin-bottom: 2rem;
}

.hero h1 {
  margin-bottom: 0.5rem;
}

.hero .subtitle {
  font-size: 1.125rem;
  color: var(--cobalt-500);
  font-weight: 500;
  margin-bottom: 1rem;
}

.hero .tagline {
  font-size: 0.9375rem;
  color: #666;
  max-width: 480px;
  margin: 0 auto 1.5rem;
}

/* --- Hero Figure Annotation --- */
.hero-fig {
  text-align: center;
  margin: 0.5rem 0 2rem;
  font-family: 'SF Mono', ui-monospace, 'Cascadia Code', monospace;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cobalt-400);
}

/* --- Section Dividers (blueprint style) --- */
.section-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 3.5rem 0 2.5rem;
}

.section-divider .line {
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--cobalt-200) 0px,
    var(--cobalt-200) 6px,
    transparent 6px,
    transparent 10px
  );
}

.section-divider .fig-label {
  font-family: 'SF Mono', ui-monospace, monospace;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cobalt-400);
  white-space: nowrap;
}

/* --- Sections --- */
section {
  margin-bottom: 3rem;
}

section h2 {
  margin-bottom: 1.5rem;
}

/* --- About Cards (hand-drawn box style) --- */
.sketch-box {
  position: relative;
  border: 2px solid var(--cobalt-400);
  border-radius: 3px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  background: rgba(255,255,255,0.6);
}

/* Second border — slightly offset for wobble illusion */
.sketch-box::before {
  content: '';
  position: absolute;
  inset: -3px;
  border: 1px solid var(--cobalt-200);
  border-radius: 4px;
  pointer-events: none;
}

.sketch-box h3 {
  margin-bottom: 0.75rem;
}

.sketch-box p:last-child {
  margin-bottom: 0;
}

/* --- Info Grid (stats/attributes) --- */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.info-item {
  border: 1px solid var(--cobalt-200);
  border-radius: 2px;
  padding: 0.75rem 1rem;
}

.info-item .label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cobalt-400);
  font-family: 'SF Mono', ui-monospace, monospace;
  margin-bottom: 0.25rem;
}

.info-item .value {
  font-size: 0.9375rem;
  color: var(--cobalt-700);
  font-weight: 500;
}

/* --- Links Row (social/contact) --- */
.links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.links-row a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  padding: 0.4rem 0.75rem;
  border: 1.5px solid var(--cobalt-200);
  border-radius: 2px;
  color: var(--cobalt-600);
  transition: border-color 0.2s, background 0.2s;
}

.links-row a:hover {
  border-color: var(--cobalt-500);
  background: var(--cobalt-50);
}

/* Arrow indicator */
.links-row a::after {
  content: '→';
  font-size: 0.75rem;
  opacity: 0.5;
  transition: transform 0.2s;
}
.links-row a:hover::after {
  transform: translateX(2px);
}

/* --- Blog Placeholder --- */
.blog-placeholder {
  text-align: center;
  padding: 3rem 1.5rem;
}

.blog-placeholder .empty-icon {
  margin-bottom: 1.5rem;
  opacity: 0.6;
}

.blog-placeholder h3 {
  color: var(--cobalt-500);
  margin-bottom: 0.75rem;
}

.blog-placeholder p {
  font-size: 0.9375rem;
  color: #888;
  max-width: 360px;
  margin: 0 auto;
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 3rem 0 1rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--cobalt-200) 0px,
    var(--cobalt-200) 4px,
    transparent 4px,
    transparent 8px
  );
}

footer p {
  font-size: 0.8125rem;
  color: var(--cobalt-400);
  margin-bottom: 0.25rem;
}

footer .fig-anno {
  font-family: 'SF Mono', ui-monospace, monospace;
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cobalt-300);
}

/* --- Scroll Animation (entrance) --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays */
.fade-in.delay-1 { transition-delay: 0.1s; }
.fade-in.delay-2 { transition-delay: 0.2s; }
.fade-in.delay-3 { transition-delay: 0.3s; }
.fade-in.delay-4 { transition-delay: 0.4s; }
.fade-in.delay-5 { transition-delay: 0.5s; }

/* --- Responsive --- */
@media (max-width: 640px) {
  :root {
    --content-pad: 1.25rem;
  }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.25rem; }

  .info-grid {
    grid-template-columns: 1fr;
  }

  nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  .links-row {
    flex-direction: column;
  }

  .links-row a {
    justify-content: center;
  }

  .hero svg {
    max-width: 340px;
  }
}

/* --- Utility: monospace annotations --- */
.mono {
  font-family: 'SF Mono', ui-monospace, 'Cascadia Code', monospace;
}