/* Landing page — mobile-first. */

/* Hero */
.hero { padding: 20px 0 36px; background: radial-gradient(120% 70% at 100% 0%, var(--accent-soft) 0%, transparent 60%); }
.hero-grid { display: grid; gap: 24px; }
.hero h1 { margin-top: 10px; }
.hl { color: var(--accent); }
.lead { margin-top: 12px; font-size: 1.05rem; color: var(--ink-2); }
.hero-ctas { margin-top: 20px; display: grid; gap: 10px; }
.hero-note { margin-top: 12px; font-size: 0.88rem; }

/* Demo card */
.demo { padding: 16px; }
.demo-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 0.9rem; }
.demo-title { font-weight: 700; }
.demo-score { color: var(--accent-ink); font-weight: 700; background: var(--accent-soft); padding: 4px 10px; border-radius: 999px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.demo-staff { margin: 8px 0 4px; color: var(--ink); }
.demo-note { transition: transform 0.25s cubic-bezier(.3,1.4,.5,1), color 0.15s; }
.demo-staff.correct .demo-note { color: var(--ok); }
.demo-staff.wrong .demo-note { color: var(--bad); }
.demo-staff.wrong svg { animation: shake 0.3s; }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
.demo-feedback { min-height: 1.5em; text-align: center; font-size: 0.92rem; color: var(--ink-2); font-weight: 500; }
/* Demo piano: nine white keys E4–F5 (the staff's lines and spaces) plus the black keys between them */
.demo-piano { position: relative; display: flex; height: 128px; margin-top: 12px; touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.demo-piano button { padding: 0; min-width: 0; border: 0; -webkit-tap-highlight-color: transparent; }
.demo-piano .white { flex: 1; height: 100%; background: #fff; border: 1px solid var(--line); border-left-width: 0; border-radius: 0 0 8px 8px; box-shadow: inset 0 -5px 0 var(--paper-2); transition: background 0.1s; }
.demo-piano .white:first-child { border-left-width: 1px; }
.demo-piano .black { position: absolute; top: 0; z-index: 1; width: 7%; height: 60%; transform: translateX(-50%); background: var(--ink); border-radius: 0 0 5px 5px; box-shadow: inset 0 -4px 0 #3a4066; }
.demo-piano .white:active { background: var(--paper-2); }
.demo-piano .black:active { background: #3a4066; }
.demo-piano .ok { background: var(--ok) !important; box-shadow: none; }
.demo-piano .no { background: var(--bad) !important; box-shadow: none; }
.demo-done { margin-top: 14px; display: grid; gap: 12px; text-align: center; font-size: 0.95rem; }

/* Works with */
.works { padding: 8px 0 8px; }
.works-label { font-size: 0.85rem; font-weight: 600; text-align: center; }
.works-list { list-style: none; margin: 10px 0 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.works-list li { background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-size: 0.9rem; font-weight: 600; }

/* Steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.step { padding: 20px; position: relative; }
.step-num { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--ink); color: #fff; font-weight: 800; margin-bottom: 12px; }
.step p { margin-top: 6px; color: var(--ink-2); }

/* Ways to answer */
.section-alt { background: var(--paper-2); }
.ways { display: grid; gap: 14px; }
.way { padding: 20px; display: grid; grid-template-columns: 48px 1fr; column-gap: 14px; align-items: start; }
.way-icon { grid-row: span 2; width: 48px; height: 48px; border-radius: 12px; background: var(--teal-soft); color: var(--teal); display: grid; place-items: center; padding: 8px; }
.way p { color: var(--ink-2); margin-top: 4px; font-size: 0.95rem; }

/* Learning path — vertical on phones */
.path { list-style: none; margin: 0; padding: 0; position: relative; display: grid; gap: 22px; }
.path::before { content: ''; position: absolute; left: 23px; top: 24px; bottom: 24px; width: 2px; background: var(--line); }
.path-item { display: grid; grid-template-columns: 48px 1fr; gap: 14px; position: relative; }
.path-dot { width: 48px; height: 48px; border-radius: 50%; background: var(--card); border: 2px solid var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-weight: 800; font-size: 0.85rem; z-index: 1; }
.path-item:last-child .path-dot { background: var(--accent); color: #fff; }
.path-item p { color: var(--ink-2); margin-top: 4px; font-size: 0.95rem; }

/* Teachers */
.teachers { background: var(--ink); color: #fff; }
.teachers h2 { margin-top: 8px; }
.eyebrow-light { color: var(--gold); }
.teachers-grid { display: grid; gap: 32px; }
.checks { list-style: none; margin: 20px 0 24px; padding: 0; display: grid; gap: 12px; color: #d8daea; }
.checks li { padding-left: 32px; position: relative; }
.checks li::before { content: '✓'; position: absolute; left: 0; top: 0; width: 22px; height: 22px; border-radius: 50%; background: var(--accent); color: #fff; font-size: 0.8rem; font-weight: 800; display: grid; place-items: center; }
.class-mock { color: var(--ink); padding: 16px; }
.class-mock-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.pill { font-size: 0.75rem; font-weight: 700; background: var(--teal-soft); color: var(--teal); padding: 3px 10px; border-radius: 999px; }
.class-rows { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.class-rows li { display: grid; grid-template-columns: 32px 1fr 70px 40px; align-items: center; gap: 10px; font-size: 0.9rem; }
.avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--c); color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 0.85rem; }
.bar { height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--ok); border-radius: 999px; }
.num { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.inactive .name, .inactive .num { color: var(--muted); }
.class-mock-foot { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 0.85rem; color: var(--ink-2); }

/* Pricing */
.plans { display: grid; gap: 16px; }
.plan { padding: 22px; display: flex; flex-direction: column; position: relative; }
.plan ul { list-style: none; margin: 14px 0 20px; padding: 0; display: grid; gap: 8px; flex: 1; }
.plan li { padding-left: 24px; position: relative; color: var(--ink-2); font-size: 0.95rem; }
.plan li::before { content: '✓'; position: absolute; left: 0; color: var(--ok); font-weight: 800; }
.price { font-size: 1.6rem; font-weight: 800; margin-top: 4px; }
.plan-featured { border: 2px solid var(--accent); }
.plan-badge { position: absolute; top: -12px; left: 22px; background: var(--accent); color: #fff; font-size: 0.75rem; font-weight: 800; padding: 3px 10px; border-radius: 999px; }
.proto-note { margin-top: 14px; font-size: 0.8rem; color: var(--muted); text-align: center; }

/* FAQ */
.faq { display: grid; gap: 10px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.faq summary { list-style: none; cursor: pointer; padding: 16px 48px 16px 16px; font-weight: 700; position: relative; min-height: var(--tap); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-size: 1.4rem; color: var(--accent); transition: transform 0.2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { padding: 0 16px 16px; color: var(--ink-2); }

/* Final CTA */
.final-cta { padding: 56px 0 64px; text-align: center; background: linear-gradient(180deg, var(--paper) 0%, var(--accent-soft) 100%); }
.final-cta p { margin: 10px 0 22px; color: var(--ink-2); font-size: 1.05rem; }

/* Sticky mobile CTA */
.sticky-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; padding: 10px var(--pad) calc(10px + env(safe-area-inset-bottom));
  background: rgba(250, 247, 242, 0.96); backdrop-filter: blur(8px); border-top: 1px solid var(--line);
  transform: translateY(110%); transition: transform 0.25s ease;
}
.sticky-cta.show { transform: translateY(0); }

/* Tablet */
@media (min-width: 768px) {
  .demo-piano { height: 140px; }
  .hero { padding: 56px 0 72px; }
  .hero-ctas { display: flex; flex-wrap: wrap; }
  .demo { max-width: 460px; justify-self: center; width: 100%; padding: 22px; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .ways { grid-template-columns: repeat(2, 1fr); }
  .plans { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
  .faq-wrap { max-width: 760px; }
  .sticky-cta { display: none; }
}

/* Desktop */
@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: 1.1fr 1fr; align-items: center; gap: 56px; }
  .demo { justify-self: end; }
  .ways { grid-template-columns: repeat(4, 1fr); }
  .way { grid-template-columns: 1fr; }
  .way-icon { grid-row: auto; margin-bottom: 14px; }
  .path { grid-template-columns: repeat(4, 1fr); gap: 20px; }
  .path::before { left: 24px; right: 24px; top: 23px; bottom: auto; width: auto; height: 2px; }
  .path-item { grid-template-columns: 1fr; }
  .teachers-grid { grid-template-columns: 1fr 1fr; align-items: center; gap: 64px; }
}

/* Solfège names (Do, Sol, Lya) are longer than letters */