:root {
  color-scheme: light;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f7f5f2;
  color: #181818;
  line-height: 1.6;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #fff 0%, #f2eee9 45%, #e8dfd6 100%);
}

body, button, input, textarea, select {
  font: 16px/1.5 "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.page-shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.hero {
  background: #ffffffcc;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 22px;
  padding: 32px;
  box-shadow: 0 24px 60px rgba(31, 40, 55, 0.08);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  color: #8e8a88;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.5rem, 4vw, 4rem);
  line-height: 1.02;
}

.hero-copy {
  margin: 0 0 24px;
  max-width: 720px;
  color: #4a4a4a;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

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

.primary {
  color: #ffffff;
  background: #3b6cff;
}

.secondary {
  color: #3b6cff;
  background: rgba(59, 108, 255, 0.12);
}

.tertiary {
  color: #1b1b1b;
  background: rgba(0, 0, 0, 0.06);
}

.intro-cards {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 32px 0;
}

.card {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 14px 40px rgba(31, 40, 55, 0.06);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

.content-section {
  margin: 42px 0;
  padding: 28px 0;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.content-section h2 {
  margin: 0 0 16px;
  font-size: 1.7rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

thead th {
  text-align: left;
  font-weight: 700;
  padding: 16px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

tbody tr:nth-child(even) {
  background: rgba(59, 108, 255, 0.04);
}

td, th {
  padding: 14px 16px;
  vertical-align: top;
}

td {
  color: #444;
}

.study-list {
  list-style: decimal inside;
  margin: 0;
  padding: 0;
  color: #444;
}

.study-list li {
  margin: 0 0 14px;
}

.page-footer {
  margin: 36px 0 0;
  padding: 24px;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  color: #6b6b6b;
}

.keyboard-demo {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(240px, 1fr);
  gap: 28px;
  align-items: start;
}

.keyboard {
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 22px;
  padding: 24px;
  display: grid;
  gap: 18px;
}

.keys {
  display: grid;
  grid-template-columns: repeat(8, minmax(40px, 1fr));
  gap: 6px;
}

.key {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  border-radius: 14px;
  border: 1px solid #d7d3cc;
  background: #fcfcfc;
  color: #1a1a1a;
  font-weight: 700;
}

.key.hit {
  background: #3b6cff;
  color: #fff;
  border-color: #2f5ded;
}

.key-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(44px, 1fr));
  gap: 10px;
  justify-content: start;
}

.key.black {
  background: #1f1f1f;
  color: #fff;
  border-color: #1a1a1a;
  min-height: 38px;
  border-radius: 12px;
}

.keyboard-note {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 22px;
  padding: 24px;
  color: #4a4a4a;
}

.fingering {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.finger-box {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 20px;
  padding: 20px;
}

.finger-box h3 {
  margin: 0 0 10px;
}

.finger-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 10px 0 0;
}

.finger-row span {
  font-weight: 700;
}

kbd {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 12px;
  background: #f2f0ec;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (max-width: 900px) {
  .keyboard-demo {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .hero {
    padding: 24px;
  }
  .hero-actions {
    width: 100%;
  }
  .button {
    width: 100%;
  }
}