:root {
  --color-page: #fbfaf6;
  --color-surface: #ffffff;
  --color-ink: #202521;
  --color-muted: #646c64;
  --color-line: #dfded5;
  --color-accent: #356b57;
  --color-accent-strong: #214d3f;
  --color-accent-soft: #e3eee8;
  --color-gold: #b8893b;
  --shadow-soft: 0 24px 70px rgba(35, 43, 36, 0.12);
  --radius-small: 8px;
  --radius-large: 18px;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(227, 238, 232, 0.9), transparent 34rem),
    linear-gradient(180deg, #fbfaf6 0%, #f6f3ec 100%);
  color: var(--color-ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(53, 107, 87, 0.35);
  outline-offset: 4px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2,
h3 {
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  font-size: 2.7rem;
  font-weight: 720;
}

h2 {
  font-size: 2rem;
  font-weight: 690;
}

h3 {
  font-size: 1.08rem;
  font-weight: 690;
}

p {
  color: var(--color-muted);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

.section {
  padding-block: clamp(72px, 12vw, 128px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 14px max(16px, calc((100vw - var(--container)) / 2));
  background: rgba(251, 250, 246, 0.86);
  border-bottom: 1px solid rgba(223, 222, 213, 0.74);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-height: 44px;
  font-size: 1rem;
  font-weight: 720;
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
}

.site-nav {
  display: none;
  position: absolute;
  top: calc(100% + 1px);
  right: 16px;
  left: 16px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  box-shadow: var(--shadow-soft);
}

.site-nav.is-open {
  display: grid;
}

.site-nav a {
  padding: 12px;
  color: var(--color-muted);
  font-size: 0.94rem;
  font-weight: 650;
  text-decoration: none;
  border-radius: 6px;
}

.site-nav a:hover {
  color: var(--color-ink);
  background: var(--color-accent-soft);
}

.nav-toggle {
  display: inline-grid;
  place-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--color-ink);
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  cursor: pointer;
}

.nav-toggle span[aria-hidden="true"] {
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
}

.hero {
  min-height: calc(100svh - 72px);
  display: flex;
  align-items: center;
  padding-block: clamp(64px, 10vw, 112px);
}

.hero-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

.hero-copy {
  display: grid;
  gap: 22px;
}

.hero-lede {
  max-width: 700px;
  color: #4f584f;
  font-size: 1.08rem;
}

.eyebrow {
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 8px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  font-size: 0.96rem;
  font-weight: 720;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #ffffff;
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
}

.button-primary:hover {
  background: var(--color-accent);
}

.button-secondary {
  color: var(--color-accent-strong);
  background: rgba(255, 255, 255, 0.68);
  border-color: var(--color-line);
}

.button-secondary:hover {
  background: #ffffff;
  border-color: #c9c8bd;
}

.hero-visual {
  min-height: 360px;
  display: grid;
  place-items: center;
  padding: clamp(18px, 4vw, 34px);
  background:
    linear-gradient(135deg, rgba(53, 107, 87, 0.16), rgba(184, 137, 59, 0.12)),
    repeating-linear-gradient(135deg, rgba(32, 37, 33, 0.045) 0 1px, transparent 1px 18px);
  border: 1px solid rgba(53, 107, 87, 0.16);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-soft);
}

.measure-card {
  width: min(100%, 460px);
  padding: clamp(20px, 4vw, 30px);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: var(--radius-large);
  box-shadow: 0 18px 50px rgba(35, 43, 36, 0.13);
}

.measure-card-header,
.harmony-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 720;
}

.measure-card-header span:first-child {
  color: var(--color-ink);
}

.fretboard {
  position: relative;
  height: 220px;
  margin-block: 28px;
  overflow: hidden;
  background: linear-gradient(90deg, #2a302c, #3d443d);
  border-radius: var(--radius-small);
}

.string,
.fret {
  position: absolute;
  display: block;
  background: rgba(255, 255, 255, 0.32);
}

.string {
  right: 0;
  left: 0;
  height: 1px;
}

.string-1 {
  top: 20%;
}

.string-2 {
  top: 40%;
}

.string-3 {
  top: 60%;
}

.string-4 {
  top: 80%;
}

.fret {
  top: 0;
  bottom: 0;
  width: 2px;
}

.fret-1 {
  left: 20%;
}

.fret-2 {
  left: 40%;
}

.fret-3 {
  left: 60%;
}

.fret-4 {
  left: 80%;
}

.note {
  position: absolute;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #203327;
  font-size: 0.92rem;
  font-weight: 800;
  background: #f1c76f;
  border: 3px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.note-root {
  top: calc(20% - 21px);
  left: calc(19% - 21px);
}

.note-third {
  top: calc(40% - 21px);
  left: calc(39% - 21px);
  background: #b8dccb;
}

.note-fifth {
  top: calc(60% - 21px);
  left: calc(59% - 21px);
  background: #f3e6c9;
}

.note-seventh {
  top: calc(80% - 21px);
  left: calc(79% - 21px);
  background: #d4d9f5;
}

.harmony-row span {
  flex: 1;
  padding: 10px 8px;
  text-align: center;
  background: var(--color-accent-soft);
  border-radius: 6px;
}

.split {
  display: grid;
  gap: 34px;
}

.split > div:first-child {
  display: grid;
  gap: 14px;
}

.section-copy {
  display: grid;
  gap: 18px;
  max-width: 680px;
  font-size: 1.06rem;
}

.product-section {
  background: #f0eee6;
}

.product-panel {
  display: grid;
  gap: 34px;
  padding: clamp(24px, 5vw, 52px);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(251, 250, 246, 0.84)),
    linear-gradient(135deg, rgba(53, 107, 87, 0.08), rgba(184, 137, 59, 0.1));
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
}

.product-copy {
  display: grid;
  align-content: start;
  justify-items: start;
  gap: 18px;
}

.product-copy p {
  max-width: 620px;
}

.product-details {
  display: grid;
  gap: 14px;
}

.product-details > div,
.principle-card {
  padding: 20px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
}

.product-details h3,
.principle-card h3 {
  margin-top: 10px;
  margin-bottom: 9px;
}

.detail-number {
  color: var(--color-gold);
  font-size: 0.78rem;
  font-weight: 820;
}

.section-heading {
  display: grid;
  gap: 14px;
  max-width: 760px;
  margin-bottom: 34px;
}

.principles-grid {
  display: grid;
  gap: 14px;
}

.contact-section {
  padding-top: 0;
}

.contact-panel {
  display: grid;
  gap: 28px;
  align-items: center;
  padding-block: clamp(36px, 6vw, 56px);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.contact-panel > div {
  display: grid;
  gap: 12px;
}

.contact-panel p {
  max-width: 610px;
}

.contact-link {
  display: inline-flex;
  justify-self: start;
  min-height: 48px;
  align-items: center;
  color: var(--color-accent-strong);
  font-size: 1.08rem;
  font-weight: 760;
}

.site-footer {
  padding-block: 30px;
}

.footer-inner {
  display: grid;
  gap: 16px;
  color: var(--color-muted);
  font-size: 0.92rem;
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
}

.footer-inner a {
  color: var(--color-muted);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--color-ink);
}

@media (min-width: 720px) {
  h1 {
    font-size: 4.25rem;
  }

  h2 {
    font-size: 2.6rem;
  }

  .hero-lede {
    font-size: 1.2rem;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .site-nav a {
    padding: 10px 12px;
  }

  .principles-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-panel,
  .footer-inner {
    grid-template-columns: 1fr auto;
  }

  .footer-inner {
    align-items: center;
  }

  .contact-link {
    font-size: 1.32rem;
  }
}

@media (min-width: 920px) {
  h1 {
    font-size: 5.35rem;
  }

  h2 {
    font-size: 3.1rem;
  }

  .hero-lede {
    font-size: 1.28rem;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  }

  .split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
  }

  .product-panel {
    grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.75fr);
  }
}

@media (min-width: 1080px) {
  .contact-link {
    font-size: 1.5rem;
  }

  .principles-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}