:root {
  /* Exact brand palette */
  --base: #090A10;
  --primary: #2F6BFF;
  --accent: #FF7A1A;

  /* Derived neutrals (tints/shades of base + primary for depth) */
  --surface: #11131C;
  --surface-2: #171A26;
  --surface-3: #1D2130;
  --border: #2A2F42;
  --border-strong: #3A4160;
  --text: #F3F5FA;
  --muted: #A7AEC4;
  --muted-2: #7E869E;

  --primary-dim: rgba(47, 107, 255, 0.14);
  --primary-glow: rgba(47, 107, 255, 0.28);
  --accent-dim: rgba(255, 122, 26, 0.16);
  --live: #2F6BFF;
  --live-bg: rgba(47, 107, 255, 0.14);

  --sidebar-w: 248px;
  --topbar-h: 64px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--base);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary);
  color: #fff;
  padding: 0.5rem 0.75rem;
  z-index: 200;
  border-radius: var(--radius-sm);
}
.skip-link:focus { left: 0.75rem; top: 0.75rem; }

/* —— Shell —— */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* —— Sidebar —— */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.15rem 0.9rem 1rem;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 30;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.35rem 0.55rem;
  color: var(--text);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--primary);
  color: #090A10;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.brand-text strong {
  font-size: 0.92rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-text span {
  font-size: 0.72rem;
  color: var(--muted);
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.side-nav .nav-label {
  margin: 0.5rem 0.65rem 0.35rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  font-weight: 550;
  font-size: 0.95rem;
  border: 1px solid transparent;
}
.nav-item:hover {
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
}
.nav-item.active {
  background: var(--primary-dim);
  color: var(--text);
  border-color: rgba(47, 107, 255, 0.25);
}
.nav-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.9;
}
.sidebar-foot {
  margin-top: auto;
  padding: 0.75rem 0.65rem 0.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted-2);
  font-size: 0.75rem;
}

/* —— Main column —— */
.main-col {
  min-width: 0;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(900px 420px at 85% -10%, var(--primary-glow), transparent 55%),
    radial-gradient(700px 380px at -5% 30%, var(--accent-dim), transparent 50%),
    var(--base);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1.5rem;
  background: rgba(9, 10, 16, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}
.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  place-items: center;
}
.menu-btn:hover { border-color: var(--border-strong); }
.page-title {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}
.topbar-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.pill-live {
  background: var(--live-bg);
  color: #B8CDFF;
  border: 1px solid rgba(47, 107, 255, 0.35);
}
.pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.2);
}

.content {
  padding: 1.35rem 1.5rem 2.5rem;
  width: min(100%, 1120px);
}

/* —— Panels / sections —— */
.panel {
  display: none;
}
.panel.active { display: block; }

.intro-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  margin-bottom: 1.15rem;
  box-shadow: var(--shadow);
}
.intro-card .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 0.55rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.intro-card h2 {
  margin: 0 0 0.45rem;
  font-size: 1.45rem;
  letter-spacing: -0.025em;
}
.intro-card p {
  margin: 0;
  color: var(--muted);
  max-width: 48rem;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.stat-label {
  margin: 0 0 0.35rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
}
.stat-value {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 750;
  letter-spacing: -0.03em;
  color: var(--text);
}
.stat-value .unit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-left: 0.25rem;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 0.85rem;
}
.section-head h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.015em;
}
.section-head p {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* Project cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.9rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.05rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}
.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface-3);
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.card-icon img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}
.card-body h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  letter-spacing: -0.015em;
}
.card-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}
.card-actions {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 650;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.empty {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

/* About */
.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}
.about-card p {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

/* Mobile bottom nav / overlay */
.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 40;
}
.backdrop.show { display: block; }

.mobile-nav {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 35;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 0.35rem 0.5rem calc(0.35rem + env(safe-area-inset-bottom));
  grid-template-columns: repeat(3, 1fr);
  gap: 0.25rem;
}
.mobile-nav .nav-item {
  flex-direction: column;
  gap: 0.2rem;
  justify-content: center;
  padding: 0.45rem 0.35rem;
  font-size: 0.72rem;
  border-radius: 10px;
}
.mobile-nav .nav-item svg { width: 20px; height: 20px; }

/* 404 page helper */
.page-404 {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
  background:
    radial-gradient(700px 360px at 50% 0%, var(--primary-glow), transparent 55%),
    var(--base);
  text-align: center;
}
.page-404 .box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.page-404 .code {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
}
.page-404 h1 { margin: 0 0 0.5rem; letter-spacing: -0.02em; }
.page-404 p { margin: 0 0 1.25rem; color: var(--muted); }

@media (max-width: 860px) {
  .app {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(280px, 86vw);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-btn { display: grid; }
  .mobile-nav { display: grid; }
  .content {
    padding: 1.1rem 1rem 5.5rem;
  }
  .topbar { padding: 0 1rem; }
}

@media (min-width: 861px) {
  .mobile-nav { display: none !important; }
}