:root {
  --bg: #06070b;
  --bg-raised: #0d0f16;
  --bg-card: rgba(255, 255, 255, 0.035);
  --fg: #eef0f6;
  --fg-dim: #9aa1b4;
  --fg-faint: #666d82;
  --border: rgba(255, 255, 255, 0.09);
  --max-width: 1200px;
  --radius: 10px;
  --radius-lg: 18px;

  --glow-cyan: #4fe0ff;
  --glow-magenta: #ff5fd8;
  --glow-amber: #ffb84f;
  --glow-green: #5dffb0;
  --glow-violet: #b487ff;
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

html { color-scheme: dark; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(79, 224, 255, 0.10), transparent 40%),
    radial-gradient(circle at 85% 28%, rgba(180, 135, 255, 0.09), transparent 40%),
    radial-gradient(circle at 30% 85%, rgba(255, 95, 216, 0.07), transparent 40%),
    linear-gradient(var(--bg), var(--bg));
  background-attachment: fixed;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a { color: var(--glow-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------------------------------------------------------- */
/* Header / nav                                                      */
/* ---------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 7, 11, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--fg);
}
.logo:hover { text-decoration: none; }

.logo-mark {
  flex: 0 0 auto;
  filter: drop-shadow(0 0 6px rgba(79, 224, 255, 0.8));
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2.25rem;
  height: 2.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--fg);
  border-radius: 1px;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.25rem;
}

.nav-list a {
  display: block;
  padding: 0.5rem 0.9rem;
  color: var(--fg-dim);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 999px;
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-list a:hover {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.06);
  text-decoration: none;
}
.nav-list .nav-cta {
  color: var(--glow-cyan);
}

/* ---------------------------------------------------------------- */
/* Page / project hero                                               */
/* ---------------------------------------------------------------- */

.page-hero {
  padding: 3.5rem 0 2.5rem;
}

.page-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--glow-cyan);
  margin: 0 0 0.75rem;
}

.page-hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  margin: 0 0 1rem;
}

.page-hero .lede {
  color: var(--fg-dim);
  font-size: 1.1rem;
  max-width: 46rem;
  margin: 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--fg-dim);
  font-size: 0.9rem;
}
.back-link:hover { color: var(--fg); }

/* ---------------------------------------------------------------- */
/* Bulletin board — scattered glowing project cards                  */
/* ---------------------------------------------------------------- */

.board-section {
  padding: 3rem 0 5rem;
}

.board-intro {
  text-align: center;
  margin-bottom: 3rem;
}

.board {
  display: flex;
  flex-direction: column;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 0.5rem;
}

.board-card {
  position: relative;
  width: min(430px, 100%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.9rem;
  margin-top: 2.75rem;
  backdrop-filter: blur(3px);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.board-card:first-child { margin-top: 0; }

.board-card[data-glow="cyan"]    { --glow: var(--glow-cyan); }
.board-card[data-glow="magenta"] { --glow: var(--glow-magenta); }
.board-card[data-glow="amber"]   { --glow: var(--glow-amber); }
.board-card[data-glow="green"]   { --glow: var(--glow-green); }
.board-card[data-glow="violet"]  { --glow: var(--glow-violet); }

.board-card {
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.02) inset,
    0 0 22px -6px var(--glow, var(--glow-cyan)),
    0 0 2px 0 var(--glow, var(--glow-cyan));
  border-color: color-mix(in srgb, var(--glow, var(--glow-cyan)) 45%, var(--border));
}

.board-card:hover {
  transform: translateY(-3px) rotate(0deg) !important;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.03) inset,
    0 0 34px -4px var(--glow, var(--glow-cyan)),
    0 0 4px 0 var(--glow, var(--glow-cyan));
}

/* scattered placement — cycles every 6 cards, bulletin-board feel */
.board-card:nth-child(6n+1) { align-self: flex-start;                  rotate: -2deg; }
.board-card:nth-child(6n+2) { align-self: flex-end;    margin-top: 3.25rem; rotate: 1.5deg; }
.board-card:nth-child(6n+3) { align-self: center;      margin-top: 2.25rem; rotate: -1deg; }
.board-card:nth-child(6n+4) { align-self: flex-start;  margin-top: 3rem;    margin-left: 8%;  rotate: 2deg; }
.board-card:nth-child(6n+5) { align-self: flex-end;    margin-top: 2.5rem;  margin-right: 4%; rotate: -1.5deg; }
.board-card:nth-child(6n+0) { align-self: center;      margin-top: 3rem;    margin-left: -4%; rotate: 1deg; }

.board-eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--glow, var(--glow-cyan));
  margin-bottom: 0.6rem;
}

.board-card-link {
  color: var(--fg);
}
.board-card-link:hover { text-decoration: none; }

.board-card h3 {
  margin: 0 0 0.9rem;
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.board-card h3 .arrow {
  font-size: 1rem;
  color: var(--glow, var(--glow-cyan));
  transition: transform 0.15s ease;
}
.board-card-link:hover h3 .arrow { transform: translateX(3px); }

.board-bullets {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--fg-dim);
  font-size: 0.95rem;
}
.board-bullets li { margin-bottom: 0.4rem; }
.board-bullets li:last-child { margin-bottom: 0; }
.board-bullets li::marker { color: var(--glow, var(--glow-cyan)); }

/* ---------------------------------------------------------------- */
/* Smaller sub-project link cards (used on project detail pages)     */
/* ---------------------------------------------------------------- */

.subgrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0 0;
}

.subcard {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  color: var(--fg);
}
.subcard[data-glow="cyan"]    { --glow: var(--glow-cyan); }
.subcard[data-glow="magenta"] { --glow: var(--glow-magenta); }
.subcard[data-glow="amber"]   { --glow: var(--glow-amber); }
.subcard[data-glow="green"]   { --glow: var(--glow-green); }
.subcard[data-glow="violet"]  { --glow: var(--glow-violet); }
.subcard {
  box-shadow: 0 0 16px -8px var(--glow, var(--glow-cyan));
  border-color: color-mix(in srgb, var(--glow, var(--glow-cyan)) 40%, var(--border));
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.subcard:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 26px -4px var(--glow, var(--glow-cyan));
}
.subcard h4 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.subcard h4 a { color: var(--fg); }
.subcard p { margin: 0; color: var(--fg-dim); font-size: 0.9rem; }
.subcard .status {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--glow, var(--glow-cyan));
}

/* ---------------------------------------------------------------- */
/* Article prose (project detail pages)                              */
/* ---------------------------------------------------------------- */

.prose {
  max-width: 46rem;
}
.prose p { color: var(--fg-dim); }
.prose h2 {
  margin-top: 3rem;
  font-size: 1.4rem;
  color: var(--fg);
}
.prose ul { color: var(--fg-dim); }

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid color-mix(in srgb, var(--glow-cyan) 55%, var(--border));
  color: var(--fg);
  box-shadow: 0 0 18px -6px var(--glow-cyan);
}
.btn:hover {
  text-decoration: none;
  box-shadow: 0 0 26px -2px var(--glow-cyan);
}

/* ---------------------------------------------------------------- */
/* Contact / footer                                                   */
/* ---------------------------------------------------------------- */

.section-contact {
  padding: 4rem 0 3rem;
  text-align: center;
  border-top: 1px solid var(--border);
}
.section-contact h2 { margin-bottom: 1rem; }
.section-contact p { color: var(--fg-dim); }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  color: var(--fg-faint);
  font-size: 0.85rem;
}

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

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(6, 7, 11, 0.97);
    border-bottom: 1px solid var(--border);
  }
  .nav.is-open { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 0.5rem 1.5rem 1rem;
    gap: 0;
  }

  .board-card,
  .board-card:nth-child(6n+1),
  .board-card:nth-child(6n+2),
  .board-card:nth-child(6n+3),
  .board-card:nth-child(6n+4),
  .board-card:nth-child(6n+5),
  .board-card:nth-child(6n+0) {
    align-self: stretch;
    width: 100%;
    margin-left: 0;
    margin-right: 0;
    rotate: 0deg;
  }
}