.lessons-index-hero,
.lesson-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(135deg, rgba(11, 14, 20, 0.98), rgba(20, 20, 30, 0.96)),
    var(--card);
}

.music-lesson-page {
  --lesson-accent: #22d3ee;
  --lesson-accent-2: #fbbf24;
  --lesson-shadow: #3947a8;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, rgba(8, 9, 13, 0.98), rgba(13, 13, 18, 1) 54%, rgba(8, 9, 13, 1));
}

.music-lesson-page::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(180deg, rgba(8, 9, 13, 0.76), rgba(8, 9, 13, 0.98)),
    var(--lesson-artwork),
    var(--lesson-artist-photo);
  background-size: cover, min(48vw, 620px), min(42vw, 520px);
  background-position: center, left 5vw top 8vh, right 5vw bottom 10vh;
  background-repeat: no-repeat;
  opacity: 0.34;
  filter: saturate(1.25);
}

.music-lesson-page::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.026) 0 1px, transparent 1px 74px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.018) 0 1px, transparent 1px 92px);
  mask-image: linear-gradient(180deg, black, transparent 74%);
}

.lessons-index-hero {
  padding: 5rem 2rem 4rem;
  text-align: center;
}

.lessons-index-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(115deg, rgba(20, 184, 166, 0.18), transparent 34%),
    linear-gradient(245deg, rgba(245, 158, 11, 0.15), transparent 38%);
}

.lessons-index-hero h1,
.lesson-hero h1 {
  font-family: 'Playfair Display', serif;
  color: var(--text);
  font-weight: 600;
  letter-spacing: 0;
}

.lessons-index-hero h1 {
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  line-height: 1.05;
  margin: 0.75rem 0 1rem;
}

.lessons-index-hero p {
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.12rem;
}

.lesson-kicker {
  display: inline-block;
  color: color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 45%, white);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lessons-index {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem;
}

.lessons-count {
  color: var(--text-muted);
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

.lesson-artist-index,
.lesson-references,
.lesson-summary {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 32%, var(--border));
  border-radius: 8px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.18);
}

.lesson-artist-index {
  margin: 0 0 2rem;
  padding: 1rem;
}

.lesson-artist-index-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 0.7rem;
}

.lesson-artist-index h2 {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
}

.lesson-artist-index-header span {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.lesson-artist-featured,
.lesson-related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.lesson-artist-featured {
  padding-bottom: 0.8rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.lesson-artist-alpha {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 0.85rem;
}

.lesson-artist-alpha a {
  display: grid;
  place-items: center;
  min-width: 1.8rem;
  height: 1.8rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 900;
}

.lesson-artist-alpha a:hover {
  color: var(--text);
  border-color: var(--lesson-accent-2, #fbbf24);
}

.lesson-artist-groups {
  display: grid;
  gap: 0.7rem;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 0.35rem;
  scrollbar-color: color-mix(in srgb, var(--lesson-accent, #22d3ee) 45%, var(--border)) transparent;
}

.lesson-artist-group {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
}

.lesson-artist-letter {
  position: sticky;
  top: 0;
  display: grid;
  place-items: center;
  height: 1.7rem;
  color: color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 62%, white);
  background: rgba(8, 9, 13, 0.9);
  border: 1px solid color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 38%, var(--border));
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 900;
}

.lesson-artist-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.35rem;
}

.lesson-artist-featured a,
.lesson-artist-links a,
.lesson-related-list a,
.lesson-theme-strip span,
.lesson-meta span {
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 30%, var(--border));
  border-radius: 999px;
  text-decoration: none;
}

.lesson-artist-featured a,
.lesson-artist-links a,
.lesson-related-list a {
  padding: 0.38rem 0.55rem;
  font-size: 0.82rem;
  line-height: 1.15;
}

.lesson-artist-featured a {
  background: color-mix(in srgb, var(--lesson-accent, #22d3ee) 10%, transparent);
}

.lesson-artist-featured a:hover,
.lesson-artist-links a:hover,
.lesson-related-list a:hover {
  border-color: var(--lesson-accent-2, #fbbf24);
}

.lesson-artist-featured span,
.lesson-artist-links span,
.lesson-related-list span {
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
}

.lesson-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 100%;
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.025));
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.lesson-card:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 158, 11, 0.55);
  background: var(--card-hover);
}

.lesson-card-art {
  aspect-ratio: 1 / 1;
  background: #171722;
  overflow: hidden;
}

.lesson-card-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.lesson-card-placeholder {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  font-family: 'Playfair Display', serif;
  font-size: 4rem;
  color: #fbbf24;
  background:
    linear-gradient(135deg, rgba(20, 184, 166, 0.32), rgba(245, 158, 11, 0.18)),
    var(--card);
}

.lesson-card-body {
  padding: 1rem;
}

.lesson-card-body span {
  color: #fbbf24;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.lesson-card-body h2 {
  font-size: 1.22rem;
  line-height: 1.2;
  margin: 0.4rem 0 0.15rem;
}

.lesson-card-artist {
  color: var(--text);
  font-weight: 700;
  margin-bottom: 0.55rem;
}

.lesson-card-body p:not(.lesson-card-artist) {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.lesson-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(310px, 520px);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  min-height: min(760px, calc(100vh - 72px));
  padding: clamp(3.25rem, 7vw, 6.25rem) 2rem;
}

.lesson-hero > * {
  min-width: 0;
}

.lesson-hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(8, 9, 13, 0.94) 0%, rgba(8, 9, 13, 0.82) 44%, rgba(8, 9, 13, 0.56) 100%),
    var(--lesson-artwork),
    var(--lesson-artist-photo);
  background-size: cover, min(40vw, 520px), min(34vw, 460px);
  background-position: center, right 13vw center, right 2vw bottom 18%;
  background-repeat: no-repeat;
  filter: saturate(1.18) contrast(1.08);
}

.lesson-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(122deg, color-mix(in srgb, var(--lesson-accent, #22d3ee) 25%, transparent), transparent 42%),
    linear-gradient(300deg, color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 18%, transparent), transparent 46%),
    linear-gradient(180deg, transparent 62%, rgba(8, 9, 13, 0.96));
}

.lesson-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 12px;
  background:
    linear-gradient(90deg, var(--lesson-accent, #22d3ee), var(--lesson-accent-2, #fbbf24), var(--lesson-shadow, #3947a8));
}

.lesson-art-marks {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.lesson-art-title {
  position: absolute;
  right: -0.08em;
  bottom: 0.04em;
  max-width: 8.2em;
  color: rgba(255, 255, 255, 0.045);
  font-family: 'Playfair Display', serif;
  font-size: clamp(5rem, 17vw, 17rem);
  font-weight: 700;
  line-height: 0.82;
  text-align: right;
  text-transform: uppercase;
}

.lesson-lyric-motifs {
  position: absolute;
  left: min(4vw, 56px);
  bottom: clamp(1.8rem, 6vh, 5rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  max-width: min(560px, 44vw);
  opacity: 0.58;
}

.lesson-lyric-motifs span {
  padding: 0.35rem 0.55rem;
  color: color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 38%, white);
  border: 1px solid color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 45%, rgba(255, 255, 255, 0.28));
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.38);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lesson-waveform {
  position: absolute;
  right: clamp(1rem, 4vw, 4rem);
  bottom: clamp(1.8rem, 7vh, 5.5rem);
  display: flex;
  align-items: flex-end;
  gap: 0.28rem;
  height: 110px;
  opacity: 0.5;
  transform: skewX(-8deg);
}

.lesson-waveform span {
  width: clamp(4px, 0.55vw, 9px);
  height: var(--bar-height);
  background: linear-gradient(180deg, var(--lesson-accent-2, #fbbf24), var(--lesson-accent, #22d3ee));
  border-radius: 999px 999px 0 0;
  box-shadow: 0 0 28px color-mix(in srgb, var(--lesson-accent, #22d3ee) 35%, transparent);
  animation: lessonPulse 2.6s ease-in-out infinite;
  animation-delay: var(--bar-delay);
}

@keyframes lessonPulse {
  0%, 100% {
    transform: scaleY(0.78);
    opacity: 0.6;
  }
  50% {
    transform: scaleY(1);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-waveform span {
    animation: none;
  }
}

.lesson-hero-copy {
  max-width: 780px;
  justify-self: end;
}

.lesson-hero h1 {
  max-width: 10ch;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 0.95;
  margin: 0.75rem 0 0.75rem;
  text-shadow: 0 8px 40px rgba(0, 0, 0, 0.42);
  overflow-wrap: break-word;
}

.lesson-hero-copy > p {
  font-size: clamp(1.25rem, 2.7vw, 1.85rem);
  color: color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 38%, white);
  margin: 0 0 1.25rem;
  font-weight: 700;
}

.lesson-theme-strip,
.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  min-width: 0;
}

.lesson-theme-strip {
  margin: 0 0 0.85rem;
}

.lesson-theme-strip span,
.lesson-meta span {
  background: rgba(5, 8, 13, 0.52);
  backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.lesson-theme-strip span {
  padding: 0.48rem 0.72rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.lesson-meta span {
  padding: 0.38rem 0.7rem;
  font-size: 0.86rem;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.lesson-media-pair {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 0.9rem;
  align-items: end;
  width: 100%;
  min-width: 0;
  position: relative;
  filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.42));
}

.lesson-media-pair::before,
.lesson-media-pair::after {
  content: "";
  position: absolute;
  z-index: -1;
  border: 1px solid color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 28%, transparent);
  background-size: cover;
  background-position: center;
  opacity: 0.32;
}

.lesson-media-pair::before {
  inset: -18% 18% 12% -20%;
  background-image:
    linear-gradient(135deg, rgba(0, 0, 0, 0.38), transparent),
    var(--lesson-artwork);
  clip-path: polygon(0 12%, 82% 0, 100% 74%, 20% 100%);
}

.lesson-media-pair::after {
  inset: 42% -12% -18% 28%;
  background-image:
    linear-gradient(135deg, rgba(0, 0, 0, 0.32), transparent),
    var(--lesson-artist-photo);
  clip-path: polygon(18% 0, 100% 10%, 82% 100%, 0 78%);
}

.lesson-media-pair figure,
.lesson-image {
  margin: 0;
  background: var(--card);
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 35%, var(--border));
  border-radius: 8px;
  overflow: hidden;
  min-width: 0;
}

.lesson-media-pair figure:first-child {
  aspect-ratio: 1 / 1;
  transform: rotate(-1.1deg);
}

.lesson-media-pair figure:nth-child(2),
.lesson-image.placeholder {
  aspect-ratio: 4 / 5;
  transform: translateY(10%) rotate(1.4deg);
}

.lesson-media-pair img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.lesson-media-pair figcaption {
  padding: 0.55rem 0.7rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  line-height: 1.35;
  background: rgba(10, 10, 15, 0.88);
}

.lesson-image.placeholder {
  display: grid;
  place-items: center;
  padding: 1rem;
  color: var(--text-muted);
  text-align: center;
}

.lesson-article {
  position: relative;
  isolation: isolate;
  max-width: none;
  margin: 0 auto;
  padding: 3rem 2rem;
  background:
    linear-gradient(90deg,
      rgba(8, 9, 13, 0.22) 0%,
      rgba(8, 9, 13, 0.78) calc(50% - 520px),
      rgba(8, 9, 13, 0.96) calc(50% - 390px),
      rgba(8, 9, 13, 0.96) calc(50% + 390px),
      rgba(8, 9, 13, 0.78) calc(50% + 520px),
      rgba(8, 9, 13, 0.22) 100%),
    var(--lesson-artwork),
    var(--lesson-artist-photo);
  background-size: auto, min(32vw, 430px) auto, min(30vw, 390px) auto;
  background-position: center, left top, right 7rem;
  background-repeat: no-repeat, repeat-y, repeat-y;
}

.lesson-article::before,
.lesson-article::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 0;
  width: max(220px, calc((100% - 920px) / 2));
  background-size: 100% auto;
  background-repeat: repeat-y;
  opacity: 0.76;
  filter: saturate(1.15) contrast(1.05);
  pointer-events: none;
}

.lesson-article::before {
  left: 0;
  background-image:
    linear-gradient(90deg, rgba(8, 9, 13, 0.05), rgba(8, 9, 13, 0.72)),
    var(--lesson-artwork);
}

.lesson-article::after {
  right: 0;
  background-image:
    linear-gradient(270deg, rgba(8, 9, 13, 0.02), rgba(8, 9, 13, 0.62)),
    var(--lesson-artist-photo),
    var(--lesson-artwork);
  background-size: 100% 460px, 100% 520px, 100% auto;
  background-blend-mode: normal, screen, normal;
}

.lesson-article > :not(.lesson-article-atmosphere) {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.lesson-article-atmosphere {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.lesson-atmosphere-art,
.lesson-atmosphere-photo {
  position: absolute;
  width: min(38vw, 460px);
  aspect-ratio: 1 / 1;
  background-size: cover;
  background-position: center;
  opacity: 0.52;
  filter: saturate(1.25) contrast(1.05);
}

.lesson-atmosphere-art {
  top: 8rem;
  left: max(1vw, calc(50% - 720px));
  background-image:
    linear-gradient(135deg, rgba(0, 0, 0, 0.42), transparent),
    var(--lesson-artwork);
  transform: rotate(-8deg);
  clip-path: polygon(0 8%, 88% 0, 100% 82%, 16% 100%);
}

.lesson-atmosphere-photo {
  top: 34rem;
  right: max(1vw, calc(50% - 720px));
  background-image:
    linear-gradient(135deg, rgba(0, 0, 0, 0.4), transparent),
    var(--lesson-artist-photo);
  transform: rotate(7deg);
  clip-path: polygon(12% 0, 100% 14%, 84% 100%, 0 80%);
}

.lesson-motif-river {
  position: absolute;
  top: 5rem;
  right: max(2vw, calc(50% - 650px));
  display: grid;
  gap: 0.8rem;
  width: 150px;
  opacity: 0.74;
}

.lesson-motif-river span {
  color: color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 38%, white);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.lesson-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.lesson-breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.lesson-breadcrumbs a:hover {
  color: var(--text);
}

.lesson-summary {
  position: relative;
  isolation: isolate;
  padding: 1.6rem 1.75rem;
  margin-bottom: 1rem;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.lesson-summary::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--lesson-accent, #22d3ee), var(--lesson-accent-2, #fbbf24));
  border-radius: 8px 8px 0 0;
}

.lesson-summary::after,
.lesson-progression-visuals::after,
.lesson-references::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(135deg, rgba(8, 9, 13, 0.9), rgba(8, 9, 13, 0.72)),
    var(--lesson-artwork);
  background-size: cover;
  background-position: center;
  opacity: 0.3;
}

.lesson-summary h2,
.lesson-article h2 {
  font-family: 'Playfair Display', serif;
  letter-spacing: 0;
}

.lesson-summary h2 {
  font-size: 1.35rem;
  margin: 0 0 0.6rem;
}

.lesson-summary p {
  color: var(--text);
  margin: 0;
}

.lesson-soundprint {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin: 1rem 0 2.6rem;
}

.lesson-soundprint div {
  min-width: 0;
  padding: 1rem;
  border: 1px solid color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 26%, var(--border));
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.038);
}

.lesson-soundprint span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lesson-soundprint strong {
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.25;
}

.lesson-progression-visuals {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin: 2.8rem 0;
  padding: 1.25rem;
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 28%, var(--border));
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--lesson-accent, #22d3ee) 12%, transparent), rgba(255, 255, 255, 0.05));
  backdrop-filter: blur(10px);
}

.lesson-progression-visuals h2 {
  margin-top: 0;
}

.lesson-section-art {
  position: relative;
  isolation: isolate;
  width: min(100%, 900px);
  margin: 0.85rem auto 1.75rem;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 34%, rgba(255, 255, 255, 0.14));
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--lesson-shadow, #3947a8) 36%, rgba(8, 9, 13, 0.86)), rgba(8, 9, 13, 0.94)),
    var(--lesson-artwork);
  background-size: cover;
  background-position: center;
  box-shadow:
    0 34px 90px rgba(0, 0, 0, 0.28),
    inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  transform: rotate(-0.35deg);
}

.lesson-section-art::before,
.lesson-section-art::after {
  content: "";
  position: absolute;
  inset: -12%;
  z-index: -1;
  pointer-events: none;
}

.lesson-section-art::before {
  background:
    radial-gradient(circle at 22% 26%, color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 42%, transparent), transparent 28%),
    radial-gradient(circle at 78% 70%, color-mix(in srgb, var(--lesson-accent, #22d3ee) 38%, transparent), transparent 32%);
  opacity: 0.58;
}

.lesson-section-art::after {
  background:
    repeating-linear-gradient(112deg, rgba(255, 255, 255, 0.12) 0 1px, transparent 1px 16px),
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
  mix-blend-mode: screen;
  opacity: 0.24;
}

.lesson-section-art-1 {
  transform: rotate(0.35deg);
}

.lesson-section-art-2 {
  transform: rotate(-0.15deg);
}

.lesson-section-art-3 {
  transform: rotate(0.2deg);
}

.lesson-section-art svg {
  display: block;
  width: 100%;
  height: auto;
}

.section-art-title,
.section-art-motif,
.section-art-song {
  paint-order: stroke;
  stroke: rgba(0, 0, 0, 0.58);
  stroke-width: 4px;
}

.section-art-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 0;
}

.section-art-motif {
  font-family: Inter, system-ui, sans-serif;
  font-size: 23px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-art-motif.small {
  font-size: 15px;
  letter-spacing: 0.14em;
}

.section-art-song {
  font-family: Inter, system-ui, sans-serif;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-symbol {
  color: var(--lesson-accent-2, #fbbf24);
}

.section-symbol path,
.section-symbol line,
.section-symbol circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.section-symbol-technique path:first-child,
.section-symbol-lyrics path,
.section-symbol-source path:first-child {
  fill: color-mix(in srgb, var(--lesson-accent, #22d3ee) 16%, transparent);
}

.section-symbol-lyrics text {
  fill: var(--text);
  font-family: Inter, system-ui, sans-serif;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  paint-order: stroke;
  stroke: rgba(0, 0, 0, 0.58);
  stroke-width: 3px;
}

.progression-staff-list {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.15rem;
}

.progression-staff {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid color-mix(in srgb, var(--lesson-accent-2, #fbbf24) 24%, var(--border));
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
}

.staff-line,
.staff-bar {
  stroke: #1f2937;
  stroke-width: 1.8;
}

.staff-final {
  stroke-width: 3.2;
}

.staff-chord,
.staff-label {
  fill: #111827;
  font-family: Inter, system-ui, sans-serif;
  font-weight: 800;
}

.staff-label {
  font-size: 18px;
}

.staff-chord {
  font-size: 24px;
}

.staff-clef {
  fill: #111827;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 44px;
  font-weight: 700;
}

.staff-slash {
  stroke: var(--lesson-shadow, #3947a8);
  stroke-width: 6;
  stroke-linecap: round;
}

.chord-diagram-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
  gap: 0.85rem;
}

.chord-diagram {
  width: 100%;
  height: auto;
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 24%, var(--border));
  border-radius: 8px;
  background: rgba(10, 12, 18, 0.72);
}

.chord-string,
.chord-fretline {
  stroke: rgba(255, 255, 255, 0.52);
  stroke-width: 1.4;
}

.chord-nut {
  stroke: rgba(255, 255, 255, 0.9);
  stroke-width: 4;
}

.chord-dot {
  fill: var(--lesson-accent-2, #fbbf24);
  stroke: rgba(255, 255, 255, 0.68);
  stroke-width: 1.5;
}

.chord-name,
.chord-fret,
.chord-open,
.chord-muted {
  fill: var(--text);
  font-family: Inter, system-ui, sans-serif;
  font-weight: 800;
}

.chord-name {
  font-size: 15px;
}

.chord-fret,
.chord-open,
.chord-muted {
  font-size: 11px;
}

.lesson-article h2 {
  position: relative;
  font-size: 1.8rem;
  margin: 2.4rem 0 0.8rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 24%, var(--border));
}

.lesson-article h2::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(42%, 240px);
  height: 2px;
  background: linear-gradient(90deg, var(--lesson-accent, #22d3ee), var(--lesson-accent-2, #fbbf24));
}

.lesson-article > p,
.lesson-article > ul {
  position: relative;
  width: min(100%, 860px);
  padding: 0.9rem 1rem;
  margin-left: auto;
  margin-right: auto;
  border-left: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 18%, transparent);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--lesson-accent, #22d3ee) 8%, rgba(255, 255, 255, 0.03)), rgba(8, 9, 13, 0.42) 58%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.035), transparent);
  border-radius: 8px;
  backdrop-filter: blur(8px);
}

.lesson-article p,
.lesson-article li {
  font-size: 1.04rem;
  line-height: 1.78;
}

.lesson-article p {
  margin-bottom: 1rem;
}

.lesson-article ul {
  margin: 0.4rem 0 1.4rem 1.2rem;
}

.lesson-article strong {
  color: var(--lesson-accent-2, #fbbf24);
}

.lesson-article a {
  color: color-mix(in srgb, var(--lesson-accent, #22d3ee) 72%, white);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  overflow-wrap: anywhere;
}

.lesson-related {
  margin-top: 2.8rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
}

.lesson-references {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: 2.8rem;
  padding: 1.25rem 1.35rem;
  backdrop-filter: blur(10px);
}

.lesson-references h2,
.lesson-related h2 {
  margin-top: 0;
}

.lesson-references ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-references li {
  display: grid;
  gap: 0.2rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--border);
}

.lesson-references li:first-child {
  border-top: 0;
  padding-top: 0;
}

.lesson-references li:last-child {
  padding-bottom: 0;
}

.lesson-references a {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.lesson-references a:hover {
  color: var(--lesson-accent-2, #fbbf24);
}

.lesson-references span {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.lesson-pagination {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
}

.lesson-pagination a {
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--lesson-accent, #22d3ee) 30%, var(--border));
  border-radius: 8px;
  padding: 0.7rem 1rem;
  text-decoration: none;
}

.lesson-pagination a:hover {
  border-color: var(--lesson-accent-2, #fbbf24);
}

.lesson-theme-soul .lesson-hero h1 {
  font-style: italic;
}

.lesson-theme-roots .lesson-hero::before {
  background:
    linear-gradient(122deg, color-mix(in srgb, var(--lesson-accent, #85c463) 23%, transparent), transparent 40%),
    linear-gradient(300deg, color-mix(in srgb, var(--lesson-accent-2, #f6a53a) 20%, transparent), transparent 48%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.035) 0 2px, transparent 2px 10px),
    linear-gradient(180deg, transparent 62%, rgba(8, 9, 13, 0.96));
}

.lesson-theme-heavy .lesson-hero h1 {
  text-transform: uppercase;
}

.lesson-theme-industrial .lesson-art-title {
  letter-spacing: 0.02em;
  opacity: 0.85;
  color: color-mix(in srgb, var(--lesson-accent, #22d3ee) 9%, transparent);
}

.lesson-theme-roots .lesson-waveform span {
  border-radius: 0;
  transform-origin: bottom;
}

.lesson-theme-soul .lesson-lyric-motifs span {
  border-radius: 8px;
  font-style: italic;
}

.lesson-theme-groove .lesson-hero::after {
  height: 16px;
  background:
    repeating-linear-gradient(90deg, var(--lesson-accent, #d946ef) 0 18px, var(--lesson-accent-2, #2dd4bf) 18px 36px, var(--lesson-shadow, #fbbf24) 36px 54px);
}

@media (max-width: 920px) {
  .lesson-hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: 3.25rem 1.25rem 4rem;
  }

  .lesson-hero-bg {
    background:
      linear-gradient(180deg, rgba(8, 9, 13, 0.88), rgba(8, 9, 13, 0.72) 46%, rgba(8, 9, 13, 0.96)),
      var(--lesson-artwork),
      var(--lesson-artist-photo);
    background-size: cover, 86vw, 72vw;
    background-position: center, center bottom 15%, center bottom 2%;
    background-repeat: no-repeat;
  }

  .lesson-art-title {
    right: -0.04em;
    bottom: auto;
    top: 15%;
    max-width: 5.5em;
    font-size: clamp(4.4rem, 25vw, 7rem);
  }

  .lesson-atmosphere-art,
  .lesson-atmosphere-photo,
  .lesson-motif-river {
    display: none;
  }

  .lesson-article::before,
  .lesson-article::after {
    display: none;
  }

  .lesson-article {
    background:
      linear-gradient(180deg, rgba(8, 9, 13, 0.82), rgba(8, 9, 13, 0.96) 32%, rgba(8, 9, 13, 0.9)),
      var(--lesson-artwork),
      var(--lesson-artist-photo);
    background-size: auto, 118vw auto, 96vw auto;
    background-position: center, center top, center 38rem;
    background-repeat: no-repeat, no-repeat, no-repeat;
  }

  .lesson-lyric-motifs {
    left: 1.25rem;
    right: 1.25rem;
    bottom: 1.35rem;
    max-width: none;
  }

  .lesson-waveform {
    right: 1.25rem;
    bottom: 12rem;
    height: 70px;
    opacity: 0.32;
  }

  .lesson-hero-copy {
    justify-self: start;
  }

  .lesson-media-pair {
    max-width: 560px;
  }

  .lesson-soundprint {
    grid-template-columns: 1fr;
  }

  .progression-staff {
    min-width: 540px;
  }

  .progression-staff-list {
    overflow-x: auto;
    padding-bottom: 0.35rem;
  }

  .lesson-section-art {
    transform: none;
  }
}

@media (max-width: 520px) {
  .lessons-index,
  .lesson-article {
    padding: 1.25rem;
  }

  .lesson-artist-index {
    padding: 0.85rem;
  }

  .lesson-artist-index-header {
    align-items: center;
  }

  .lesson-artist-featured,
  .lesson-artist-alpha {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.6rem;
    scrollbar-width: thin;
  }

  .lesson-artist-featured a {
    flex: 0 0 auto;
  }

  .lesson-artist-groups {
    max-height: 260px;
  }

  .lesson-artist-group {
    grid-template-columns: 2rem minmax(0, 1fr);
    gap: 0.55rem;
  }

  .lesson-artist-links {
    grid-template-columns: 1fr;
  }

  .lessons-grid {
    grid-template-columns: 1fr;
  }

  .lesson-media-pair {
    grid-template-columns: 1fr;
  }

  .lesson-media-pair figure:first-child,
  .lesson-media-pair figure:nth-child(2),
  .lesson-image.placeholder {
    transform: none;
  }

  .lesson-hero h1 {
    max-width: 100%;
    font-size: clamp(2.7rem, 16vw, 4.2rem);
  }

  .lesson-section-art {
    width: calc(100% + 0.75rem);
    margin-left: -0.375rem;
    margin-right: -0.375rem;
  }

  .section-art-title {
    font-size: 28px;
  }

  .section-art-motif {
    font-size: 18px;
  }

  .section-art-motif.small {
    font-size: 12px;
  }

  .lesson-pagination {
    flex-direction: column;
  }
}