/* ============= Hero ============= */
.hero {
  position: relative;
  padding: 80px 0 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--accent) 12%, transparent) 0, transparent 40%),
    radial-gradient(circle at 80% 60%, color-mix(in srgb, var(--accent-2) 10%, transparent) 0, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .35;
  mask-image: radial-gradient(circle at center, black 0, transparent 70%);
  -webkit-mask-image: radial-gradient(circle at center, black 0, transparent 70%);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: -.025em;
  margin: 0 0 24px;
  font-weight: 700;
}

.title-line-1 { display: block; }
.title-line-2 { display: block; color: var(--ink-soft); }
.title-line-2 em {
  font-style: italic;
  color: var(--accent);
  position: relative;
}
.title-line-2 em::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 4px;
  height: 6px;
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  z-index: -1;
}

.hero-sub {
  font-size: 19px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 36px;
  max-width: 540px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 520px;
}

.hero-stats div {
  display: flex;
  flex-direction: column;
  border-left: 2px solid var(--accent);
  padding-left: 14px;
}

.hero-stats strong {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}

.hero-stats span {
  font-size: 13px;
  color: var(--ink-mute);
  margin-top: 4px;
}

/* Cover Card */
.hero-cover {
  display: flex;
  justify-content: center;
}

.cover-card {
  position: relative;
  width: 360px;
  height: 480px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--ink) 0%, #2d3540 100%);
  color: #fff;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
  transform: rotate(2deg);
  transition: transform .4s ease;
  overflow: hidden;
}

[data-theme="dark"] .cover-card {
  background: linear-gradient(135deg, #1a2025 0%, #0d1117 100%);
  border: 1px solid var(--line);
}

.cover-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 0%, color-mix(in srgb, var(--accent) 35%, transparent) 0, transparent 50%),
    radial-gradient(circle at 0% 100%, color-mix(in srgb, var(--accent-2) 25%, transparent) 0, transparent 50%);
}

.cover-card:hover { transform: rotate(0deg) scale(1.02); }

.cover-tag {
  position: relative;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: rgba(255,255,255,.6);
}

.cover-title {
  position: relative;
  font-family: var(--font-display);
  font-size: 64px;
  line-height: 1;
  letter-spacing: -.03em;
  font-weight: 700;
}

.cover-title span { display: block; }
.cover-title .accent { color: var(--accent); font-style: italic; }
[data-theme="dark"] .cover-title .accent { color: #5eead4; }

.cover-sub {
  position: relative;
  margin-top: 16px;
  font-size: 14px;
  color: rgba(255,255,255,.75);
}

.cover-net {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 200px;
  opacity: .5;
}

.cover-author {
  position: relative;
  border-top: 1px solid rgba(255,255,255,.15);
  padding-top: 14px;
}

.author-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: rgba(255,255,255,.5);
}

.author-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin-top: 4px;
}

@media (max-width: 880px) {
  .hero { padding: 48px 0 32px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-cover { order: -1; }
  .cover-card { width: 280px; height: 380px; padding: 22px; }
  .cover-title { font-size: 48px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

/* ============= Why ============= */
.why {
  padding: 80px 0;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.why-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.why-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.why-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.why-card h3 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 0 0 8px;
  color: var(--ink);
}

.why-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
}

/* ============= Chapters Preview ============= */
.chapters-preview {
  padding: 64px 0;
  background: var(--bg-soft);
}

.part-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.part-card {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all .2s ease;
  color: var(--ink);
}

.part-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  color: var(--ink);
}

.part-card.highlight {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--bg-elev) 0%, color-mix(in srgb, var(--accent) 5%, var(--bg-elev)) 100%);
}

.part-num {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.part-card h3 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 0;
  color: var(--ink);
}

.part-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

.part-count {
  margin-top: auto;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .08em;
  padding-top: 8px;
}

.cta-row {
  text-align: center;
}

/* ============= Author Section ============= */
.author-section {
  padding: 80px 0;
  background: var(--bg);
}

.author-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 60px;
  align-items: center;
}

.photo-frame {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 120px;
  font-weight: 700;
  color: #fff;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.photo-frame::after {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px dashed var(--accent);
  opacity: .4;
}

.author-bio h2 {
  font-family: var(--font-display);
  font-size: 48px;
  margin: 0 0 16px;
  letter-spacing: -.02em;
}

.bio-text {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 24px;
  max-width: 560px;
}

.author-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.author-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 500;
  font-size: 14px;
}

.author-link:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.author-link span {
  font-weight: 700;
  color: var(--accent);
}
.author-link:hover span { color: #fff; }

@media (max-width: 720px) {
  .author-grid { grid-template-columns: 1fr; gap: 32px; text-align: center; }
  .author-section { padding: 56px 0; }
  .photo-frame { margin: 0 auto; width: 220px; height: 220px; font-size: 90px; }
  .author-links { justify-content: center; }
}