/* ===== Sticky Header + Mobile Drawer — Light Mode (same selectors) ===== */

*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background-color: var(--bg, #ffffff);
  color: var(--text, #0f172a);
  line-height: 1.6;
  margin: 0;
}

/* Header */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  background-color: var(--bg-elev, #ffffff);
  border-bottom: 1px solid var(--border, #e2e8f0);
  box-shadow: var(--shadow-1, 0 1px 2px rgba(15,23,42,.05), 0 6px 20px rgba(15,23,42,.06));
  z-index: 1000;
}

.logo { max-width: 50px; height: auto; display: block; }

/* Desktop nav */
.nav-links { display: flex; gap: 20px; }

.nav-links a {
  text-decoration: none;
  font-size: 16px;
  color: var(--accent-700, #0b8078);
  padding: 8px 6px;
  border-radius: 8px;
  transition: color var(--transition, .2s ease), background-color var(--transition, .2s ease), box-shadow var(--transition, .2s ease);
}
.nav-links a:hover,
.nav-links a:focus {
  color: var(--accent-600, #0d9488);
  background-color: var(--accent-soft, #e6fbf8);
  outline: none;
}
.nav-links a:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 3px var(--ring, rgba(14,165,164,.35));
}

/* Page content offset for fixed header */
.content {
  padding-top: 80px;
  padding-left: 20px;
  padding-right: 20px;
}

/* Toggle button (mobile only) */
.header-toggle {
  display: none;
  border: none;
  color: var(--text, #0f172a);
  font-size: 1.5rem;
  cursor: pointer;
  width: auto;
  margin: 0;
  padding: .5rem;
  background: none;
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  z-index: 1002;
  border-radius: 8px;
  transition: background-color var(--transition, .2s), box-shadow var(--transition, .2s);
}
.header-toggle:hover { background-color: var(--bg-soft, #f8fafc); }
.header-toggle:focus-visible { outline: 0; box-shadow: 0 0 0 3px var(--ring, rgba(14,165,164,.35)); }

/* Overlay */
.panel-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.45);
  z-index: 1000;
}
.panel-overlay.active { display: block; }

/* Mobile drawer panel */
.mobile-panel {
  position: fixed;
  top: 0; left: -100%;
  width: 80%;
  max-width: 300px;
  height: 100%;
  background-color: var(--bg-elev, #ffffff);
  transition: left .3s ease-in-out;
  z-index: 1001;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  border-right: 1px solid var(--border, #e2e8f0);
  box-shadow: 0 10px 30px rgba(15,23,42,.12);
}
.mobile-panel.open { left: 0; }

.close-panel {
  background: none;
  border: none;
  color: var(--text, #0f172a);
  font-size: 24px;
  align-self: flex-end;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: background-color var(--transition, .2s), box-shadow var(--transition, .2s);
}
.close-panel:hover { background-color: var(--bg-soft, #f8fafc); }
.close-panel:focus-visible { outline: 0; box-shadow: 0 0 0 3px var(--ring, rgba(14,165,164,.35)); }

/* Mobile nav links */
.mobile-nav { display: flex; flex-direction: column; gap: 15px; }

.mobile-nav a {
  text-decoration: none;
  font-size: 16px;
  color: var(--text-muted, #475569);
  padding: 10px 8px;
  border-radius: 10px;
  transition: color var(--transition, .2s), background-color var(--transition, .2s), box-shadow var(--transition, .2s);
}
.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--accent-700, #0b8078);
  background-color: var(--accent-soft, #e6fbf8);
}
.mobile-nav a:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 3px var(--ring, rgba(14,165,164,.35));
}

/* Responsive */
@media (max-width: 768px) {
  header > .nav-links { display: none; }
  .header-toggle { display: block; }

  .content {
    padding-top: 80px;
    padding-left: 5vw;
    padding-right: 5vw;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .mobile-panel { transition: none; }
  .nav-links a,
  .header-toggle,
  .close-panel,
  .mobile-nav a { transition: none; }
}