:root,
html[data-theme="modern"] {
  --bg-0: #080c15;
  --bg-1: #0c1321;
  --surface-0: #0f1828;
  --surface-1: #131d2f;
  --border-0: #1f2c45;
  --text-0: #e8edf5;
  --text-1: #c7d3e6;
  --muted-color: #9fb1c8;
  --link-color: #4fd1c5;
  --link-hover-color: #7ce7d9;
  --accent-color: #4fd1c5;
  --accent-1: #7ce7d9;
  --bg-color: var(--bg-0);
  --text-color: var(--text-0);
  --border-color: var(--border-0);
  --nav-hover-bg: rgba(79, 209, 197, 0.12);
  --nav-active-bg: rgba(79, 209, 197, 0.16);
  --surface-color: var(--surface-0);
  --surface-raised: var(--surface-1);
  --focus-color: #7ce7d9;
  --overlay-bg: rgba(5, 8, 14, 0.75);
  --footer-bg: #0a101b;
  --shadow-soft: 0 16px 50px rgba(0, 0, 0, 0.35);
  --glow: 0 0 0 6px rgba(79, 209, 197, 0.16);
}

body {
  background:
    radial-gradient(120% 140% at 20% 20%, rgba(79, 209, 197, 0.08), transparent 35%),
    radial-gradient(100% 120% at 80% 0%, rgba(98, 154, 255, 0.05), transparent 30%),
    linear-gradient(180deg, #0b121f 0%, #080c15 100%);
}

html[data-theme="modern"] .site-header,
html[data-theme="modern"] .site-footer {
  background: var(--surface-0);
  border-color: var(--border-0);
  box-shadow: none;
}

html[data-theme="modern"] .content .page,
html[data-theme="modern"] .hero {
  border: 1px solid var(--border-0);
  box-shadow: var(--shadow-soft);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.0)) , var(--surface-raised);
}

/* Halo-only LED glow around hero edges (no interior tint) */
html[data-theme="modern"] .hero-panel::before,
html[data-theme="modern"] .hero-card::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: inherit;
  z-index: -1;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(0, 255, 200, 0.55),
    rgba(0, 255, 200, 0.20) 40%,
    rgba(0, 0, 0, 0) 70%
  );
  filter: blur(14px);
  opacity: 0.65;
  box-sizing: border-box;
  mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  padding: 10px;
  pointer-events: none;
  transition: opacity 0.25s ease, filter 0.25s ease, transform 0.25s ease;
}

html[data-theme="modern"] .hero-panel::after,
html[data-theme="modern"] .hero-card::after {
  content: "";
  position: absolute;
  inset: -26px;
  border-radius: inherit;
  z-index: -2;
  background: radial-gradient(
    circle at 50% 55%,
    rgba(0, 255, 200, 0.18),
    rgba(0, 255, 200, 0.08) 45%,
    rgba(0, 0, 0, 0) 75%
  );
  filter: blur(26px);
  opacity: 0.7;
  box-sizing: border-box;
  mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  padding: 18px;
  pointer-events: none;
  transition: opacity 0.25s ease, filter 0.25s ease, transform 0.25s ease;
}

html[data-theme="modern"] .hero-panel:hover::before,
html[data-theme="modern"] .hero-panel:focus-within::before,
html[data-theme="modern"] .hero-card:hover::before,
html[data-theme="modern"] .hero-card:focus-within::before {
  opacity: 0.9;
  filter: blur(16px);
}

html[data-theme="modern"] .hero-panel:hover::after,
html[data-theme="modern"] .hero-panel:focus-within::after,
html[data-theme="modern"] .hero-card:hover::after,
html[data-theme="modern"] .hero-card:focus-within::after {
  opacity: 0.95;
  filter: blur(30px);
}

html[data-theme="modern"] a {
  color: var(--link-color);
}

html[data-theme="modern"] a:hover,
html[data-theme="modern"] a:focus-visible {
  color: var(--link-hover-color);
  text-decoration: underline;
  box-shadow: none;
}

html[data-theme="modern"] .theme-toggle,
html[data-theme="modern"] .menu-toggle,
html[data-theme="modern"] .chip {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-0);
  color: var(--text-color);
  box-shadow: none;
}

html[data-theme="modern"] .theme-toggle:hover,
html[data-theme="modern"] .menu-toggle:hover,
html[data-theme="modern"] .chip:hover {
  background: rgba(255, 255, 255, 0.04);
  box-shadow: var(--glow);
}

html[data-theme="modern"] .theme-toggle:focus-visible,
html[data-theme="modern"] .menu-toggle:focus-visible,
html[data-theme="modern"] .chip:focus-visible {
  box-shadow: var(--glow);
}

html[data-theme="modern"] .theme-toggle:active,
html[data-theme="modern"] .menu-toggle:active {
  background: rgba(255, 255, 255, 0.08);
}

html[data-theme="modern"] .badge {
  border-color: var(--border-0);
  background: rgba(79, 209, 197, 0.12);
}

html[data-theme="modern"] #cursor-dot.is-hovering {
  box-shadow: 0 0 16px rgba(79, 209, 197, 0.7);
}

html[data-theme="modern"] .teletype {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  color: var(--accent-color);
  margin: var(--space-3) 0 var(--space-2);
  font-size: 0.95rem;
  text-shadow: 0 0 10px rgba(79, 209, 197, 0.35);
  text-align: center;
}

html[data-theme="modern"] .teletype-cursor {
  display: inline-block;
  margin-left: 2px;
  animation: blink 0.7s steps(1) infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Manual test checklist:
 - Load /, /blog/, /blog/posts/<any>, /projects/ in both themes.
 - Confirm teal accent consistent on links/buttons.
 - Hover/focus shows subtle glow; text remains readable.
 - System 7 theme unchanged.
*/