@font-face {
  font-family: "TimH Title";
  src: url("fonts/timh-title.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "TimH Text";
  src: url("fonts/timh-text.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --bg: #0a0d12;
  --bg-soft: #11161d;
  --panel: #141a22;
  --text: #eef2f7;
  --muted: #93a1b3;
  --accent: #35d0ba;
  --accent-2: #4a8cff;
  --border: rgba(255, 255, 255, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "TimH Text", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Ambient glowing grid backdrop */
.grid-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(900px circle at 50% -10%, rgba(53, 208, 186, 0.14), transparent 60%),
    radial-gradient(700px circle at 85% 20%, rgba(74, 140, 255, 0.10), transparent 55%),
    linear-gradient(to bottom, transparent, var(--bg) 80%),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 48px);
}

header,
main,
footer {
  position: relative;
  z-index: 1;
}

/* Hero */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 60px 24px 40px;
  display: flex;
  align-items: center;
  gap: 34px;
  text-align: left;
}

.hero .logo {
  height: 96px;
  width: auto;
  flex-shrink: 0;
  /* the source SVG is black; invert to render crisp white on the dark theme */
  filter: invert(1) drop-shadow(0 0 18px rgba(53, 208, 186, 0.25));
}

.hero h1 {
  font-family: "TimH Title", sans-serif;
  font-size: clamp(2.1rem, 5.5vw, 3.5rem);
  line-height: 1.05;
  margin: 0;
  color: #ffffff;
}

/* Chapters */
.chapters {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px 30px;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.chapter-card {
  position: relative;
  display: block;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--panel);
  text-decoration: none;
  aspect-ratio: 16 / 9;
  transition: transform 0.28s cubic-bezier(0.2, 0.7, 0.2, 1),
    box-shadow 0.28s ease, border-color 0.28s ease;
}

.chapter-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1),
    filter 0.28s ease;
  filter: brightness(0.82) saturate(0.95);
}

.chapter-num {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: "TimH Title", sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(10, 13, 18, 0.6);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border);
  color: var(--text);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

/* Float out + illuminate on hover */
.chapter-card:hover {
  transform: translateY(-10px) scale(1.03);
  border-color: rgba(53, 208, 186, 0.55);
  box-shadow:
    0 22px 50px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(53, 208, 186, 0.25),
    0 0 42px rgba(53, 208, 186, 0.35);
}

.chapter-card:hover img {
  transform: scale(1.08);
  filter: brightness(1.06) saturate(1.1);
}

.chapter-card:hover .chapter-num {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 46px 24px 40px;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: inherit;
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 760px) {
  .hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
  }
  .chapter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (max-width: 460px) {
  .chapter-grid {
    grid-template-columns: 1fr;
  }
}