:root {
  --ink: #1c1612;
  --ink-soft: #3a312a;
  --muted: #6b5f54;
  --paper: #f6efe4;
  --cream: #efe4d4;
  --card: #fffaf2;
  --gold: #c4a06a;
  --gold-deep: #8d6b3e;
  --espresso: #16110e;
  --line: rgba(28, 22, 18, 0.12);
  --shadow: 0 24px 60px rgba(22, 17, 14, 0.12);
  --serif: "Noto Serif TC", "Songti TC", serif;
  --sans: "Noto Sans TC", "PingFang HK", "Hiragino Sans CNS", sans-serif;
  --wrap: min(1120px, calc(100% - 40px));
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

h1,
h2,
h3,
.brand strong,
.hero-panel-title,
.portrait-letter {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.25;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  margin: 0 0 1rem;
}

h3 {
  font-size: 1.25rem;
  margin: 0 0 0.6rem;
}

p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.wrap {
  width: var(--wrap);
  margin: 0 auto;
}

.sr-only,
.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  background: var(--gold);
  color: var(--espresso);
  padding: 8px 12px;
  z-index: 20;
}

.skip-link:focus {
  top: 16px;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--gold-deep);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section {
  padding: 6.5rem 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 3rem;
}

.section-lead {
  font-size: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 1.25rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

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

.btn-gold {
  background: var(--gold);
  color: var(--espresso);
}

.btn-ghost {
  border-color: rgba(246, 239, 228, 0.35);
  color: var(--paper);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(22, 17, 14, 0.88);
  backdrop-filter: blur(16px);
  color: var(--paper);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border: 1px solid var(--gold);
  display: grid;
  place-items: center;
  color: var(--gold);
}

.brand-mark svg {
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 1.15rem;
}

.brand-text small {
  color: var(--gold);
  letter-spacing: 0.14em;
  font-size: 0.68rem;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.nav a {
  text-decoration: none;
  color: rgba(246, 239, 228, 0.82);
  font-size: 0.92rem;
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--gold);
  color: var(--gold) !important;
  border-radius: 999px;
}

.menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  padding: 0;
}

.menu-btn span {
  display: block;
  width: 22px;
  height: 1.5px;
  margin: 6px auto;
  background: var(--paper);
}

.mobile-nav {
  display: none;
  padding: 0 20px 20px;
}

.mobile-nav a {
  display: block;
  padding: 0.75rem 0;
  color: var(--paper);
  text-decoration: none;
  border-top: 1px solid rgba(246, 239, 228, 0.12);
}

.hero {
  position: relative;
  background:
    radial-gradient(circle at 80% 10%, rgba(196, 160, 106, 0.16), transparent 28%),
    linear-gradient(180deg, #16110e 0%, #221910 72%, #2a1d14 100%);
  color: var(--paper);
  padding: 5.5rem 0 0;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  inset: auto auto 20% -10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(196, 160, 106, 0.18), transparent 65%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: end;
  position: relative;
  z-index: 1;
  padding-bottom: 4.5rem;
}

.lead {
  font-size: 1.08rem;
  color: rgba(246, 239, 228, 0.78);
  max-width: 36rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.8rem 0 2.4rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
}

.hero-stats dt {
  color: var(--gold);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.hero-stats dd {
  margin: 0.2rem 0 0;
  font-family: var(--serif);
  font-size: 1.05rem;
}

.hero-panel {
  border: 1px solid rgba(196, 160, 106, 0.28);
  background: rgba(255, 250, 242, 0.03);
  padding: 2rem 1.6rem 1.6rem;
  min-height: 280px;
  position: relative;
}

.staff {
  display: grid;
  gap: 10px;
  margin-bottom: 1.6rem;
}

.staff span {
  display: block;
  height: 1px;
  background: rgba(196, 160, 106, 0.35);
}

.hero-panel-kicker {
  color: var(--gold);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.hero-panel-title {
  font-size: 1.45rem;
  margin-bottom: 1.4rem;
}

.hero-panel-note {
  color: rgba(246, 239, 228, 0.62);
  margin: 0;
}

.piano {
  position: relative;
  display: grid;
  grid-template-columns: repeat(14, 1fr);
  height: 78px;
  border-top: 1px solid rgba(196, 160, 106, 0.35);
}

.piano-white {
  background: linear-gradient(#f7f1e8, #e7dcc8);
  border-right: 1px solid #cbbba3;
}

.piano-black {
  position: absolute;
  top: 0;
  width: 4.4%;
  height: 48px;
  background: linear-gradient(#2a211c, #120e0b);
  border-radius: 0 0 3px 3px;
}

.audience {
  background: var(--cream);
}

.audience-grid,
.course-grid,
.quote-grid {
  display: grid;
  gap: 1.2rem;
}

.audience-grid {
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
  padding: 0;
  margin: 0;
}

.audience-grid li,
.course-card,
.quotes figure {
  background: var(--card);
  padding: 1.5rem 1.35rem;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.num {
  display: block;
  color: var(--gold-deep);
  font-family: var(--serif);
  margin-bottom: 1rem;
}

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

.course-card {
  min-height: 100%;
}

.course-card.featured {
  background: var(--espresso);
  color: var(--paper);
  border-color: transparent;
}

.course-card.featured p,
.course-card.featured li {
  color: rgba(246, 239, 228, 0.78);
}

.course-tag {
  color: var(--gold-deep);
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  margin-bottom: 0.4rem;
}

.course-card.featured .course-tag {
  color: var(--gold);
}

.course-card ul,
.check-list {
  padding-left: 1.1rem;
  color: var(--ink-soft);
}

.course-card li + li,
.check-list li + li {
  margin-top: 0.35rem;
}

.approach {
  background: var(--espresso);
  color: var(--paper);
}

.approach p,
.steps span {
  color: rgba(246, 239, 228, 0.76);
}

.approach-grid,
.teacher-grid,
.faq-grid,
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
  align-items: start;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.steps li {
  padding: 1.1rem 0 1.2rem;
  border-top: 1px solid rgba(196, 160, 106, 0.25);
}

.steps strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}

.portrait-frame {
  min-height: 420px;
  background:
    radial-gradient(circle at 70% 20%, rgba(196, 160, 106, 0.22), transparent 36%),
    linear-gradient(180deg, #2a211c 0%, #16110e 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.6rem;
  color: var(--paper);
  border: 1px solid rgba(196, 160, 106, 0.28);
}

.portrait-letter {
  font-size: 6rem;
  line-height: 1;
  margin-bottom: 0.4rem;
  color: var(--gold);
}

.quotes {
  background: var(--cream);
}

.quote-grid {
  grid-template-columns: repeat(3, 1fr);
}

.quotes blockquote {
  margin: 0 0 1.2rem;
  font-family: var(--serif);
  font-size: 1.08rem;
  color: var(--ink);
}

.quotes figcaption {
  color: var(--muted);
  font-size: 0.88rem;
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  cursor: pointer;
  padding: 1rem 0;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.faq-list summary::after {
  content: "+";
  color: var(--gold-deep);
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "–";
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list p {
  margin: 0 0 1rem;
}

.contact {
  background:
    linear-gradient(180deg, rgba(22, 17, 14, 0.04), transparent),
    var(--paper);
}

.contact-meta {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.contact-meta li {
  display: grid;
  gap: 0.15rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
}

.contact-meta span {
  color: var(--muted);
  font-size: 0.82rem;
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  background: var(--card);
  padding: 1.4rem;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.contact-form label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.contact-form .full {
  grid-column: 1 / -1;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 0.75rem 0.8rem;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--gold);
  outline-offset: 1px;
}

.form-hint,
.form-result {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.form-result {
  white-space: pre-wrap;
  background: var(--cream);
  padding: 0.85rem;
  color: var(--ink-soft);
}

.site-footer {
  background: var(--espresso);
  color: rgba(246, 239, 228, 0.7);
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
}

.brand-foot {
  font-family: var(--serif);
  color: var(--paper);
  margin-bottom: 0.2rem;
}

.copyright {
  margin: 0;
  font-size: 0.82rem;
}

.float-wa {
  position: fixed;
  right: 18px;
  bottom: 18px;
  background: #25d366;
  color: #083716;
  text-decoration: none;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(8, 55, 22, 0.25);
}

@media (max-width: 900px) {
  .nav {
    display: none;
  }

  .menu-btn {
    display: block;
  }

  .mobile-nav.is-open {
    display: block;
  }

  .hero-grid,
  .audience-grid,
  .course-grid,
  .quote-grid,
  .approach-grid,
  .teacher-grid,
  .faq-grid,
  .contact-grid,
  .contact-form,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3.5rem;
  }

  .section {
    padding: 4.2rem 0;
  }

  .footer-inner {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn:hover {
    transform: none;
  }
}