/* =========================================================
   SONOKAI Piano Care — styles.css
   配色：深炭黑 / 暖白 / 胡桃木 / 铜金
   ========================================================= */

:root {
  --charcoal:   #1f1b17;
  --charcoal-2: #2a241e;
  --warm-white: #faf6f0;
  --paper:      #ffffff;
  --walnut:     #6b4a33;
  --walnut-soft:#8a6849;
  --copper:     #b07a4a;
  --copper-dark:#8f5e36;
  --ink:        #2b2622;
  --muted:      #5f564d;
  --line:       #e7dfd4;
  --radius:     14px;
  --shadow:     0 10px 30px rgba(31,27,23,0.08);
  --maxw:       1140px;
  --nav-h:      72px;
  --serif:      "Georgia", "Times New Roman", serif;
  --sans:       -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--warm-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; color: var(--charcoal); }
a { color: var(--copper-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 原型占位：默认隐藏。上线前移除 prototype-only 类即可显示真实内容。 */
.prototype-only { display: none !important; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 780px; }
.section { padding: 96px 0; }
.section-tint { background: #f3ece2; }
.section-dark { background: var(--charcoal); color: #f3ece2; }
.section-dark h2, .section-dark h3 { color: #fff; }
.compact-legal { padding: 64px 0; }

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  margin: 0 0 16px;
  letter-spacing: 0.2px;
}
.section-title.left { text-align: left; }
.section-title.light { color: #fff; }
.h3-sub { font-size: 20px; margin: 32px 0 12px; }
.section-lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 720px;
  margin: 0 0 48px;
}
.section-lead.light { color: #d9cdbf; }
.center { text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.3px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
  text-align: center;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--copper); color: #fff; }
.btn-primary:hover { background: var(--copper-dark); color: #fff; }
.btn-outline { background: transparent; color: var(--charcoal); border-color: var(--charcoal); }
.btn-outline:hover { background: var(--charcoal); color: #fff; }
.btn-ghost { background: rgba(255,255,255,0.14); color: #fff; border-color: rgba(255,255,255,0.6); }
.btn-ghost:hover { background: #fff; color: var(--charcoal); }
.btn-outline-light { background: transparent; color: #fff; border-color: #fff; }
.btn-outline-light:hover { background: #fff; color: var(--charcoal); }
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-block { display: block; width: 100%; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,246,240,0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-h); gap: 16px;
}
.brand { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--charcoal); letter-spacing: 1px; }
.brand-tagline { font-size: 11px; color: var(--muted); letter-spacing: 0.4px; }

.primary-nav .nav-links {
  display: flex; gap: 26px; list-style: none; margin: 0; padding: 0;
}
.primary-nav .nav-links a {
  color: var(--ink); font-size: 15px; font-weight: 500;
  padding: 6px 2px; border-bottom: 2px solid transparent;
}
.primary-nav .nav-links a:hover { color: var(--copper-dark); text-decoration: none; border-color: var(--copper); }

.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle {
  background: transparent; border: 1.5px solid var(--line);
  padding: 7px 14px; border-radius: 999px; cursor: pointer;
  font-size: 13px; font-weight: 600; color: var(--ink);
}
.lang-toggle .lang-active { color: var(--copper-dark); }
.lang-toggle:hover { border-color: var(--copper); }

.nav-burger {
  display: none;
  background: none; border: 0; cursor: pointer;
  width: 44px; height: 44px; padding: 10px;
  flex-direction: column; justify-content: space-between;
}
.nav-burger span { display: block; height: 2px; background: var(--charcoal); border-radius: 2px; transition: transform .25s ease, opacity .25s ease; }
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: calc(100vh - var(--nav-h));
  background-size: cover; background-position: center;
  display: flex; align-items: center;
  color: #fff;
}
.hero-inner { padding: 100px 24px; max-width: 900px; }
.hero-eyebrow {
  text-transform: uppercase; letter-spacing: 3px; font-size: 12px;
  color: #e6c9a8; margin: 0 0 18px;
}
.hero-title {
  font-size: clamp(32px, 6vw, 60px);
  color: #fff; margin: 0 0 20px; word-wrap: break-word;
}
.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: #eee4d6; max-width: 680px; margin: 0 0 10px;
}
.hero-area { font-size: 14px; color: #e6c9a8; margin: 0 0 36px; letter-spacing: 0.5px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }
.hero-ctas.center { justify-content: center; }
.hero-trust {
  display: flex; flex-wrap: wrap; gap: 10px 28px; list-style: none; padding: 0; margin: 0;
  font-size: 14px; color: #e6d9c6;
}
.hero-trust li::before { content: "✓ "; color: var(--copper); font-weight: 700; }

/* ---------- Two choice cards ---------- */
.two-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.choice-card {
  background: var(--paper); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.choice-card-media { height: 220px; background-size: cover; background-position: center; }
.choice-card-body { padding: 32px; display: flex; flex-direction: column; gap: 16px; flex: 1; }
.choice-card-body h3 { font-size: 24px; margin: 0; }
.choice-card--accent { border-top: 3px solid var(--copper); }

/* ---------- Service cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.card-grid.six { grid-template-columns: repeat(3, 1fr); }
.service-card {
  background: var(--paper); padding: 30px; border-radius: var(--radius);
  border: 1px solid var(--line); transition: transform .2s ease, box-shadow .2s ease;
}
.service-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.service-icon {
  width: 48px; height: 48px; border-radius: 10px;
  background: #f3ece2; color: var(--walnut);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
}
.service-icon svg { width: 26px; height: 26px; }
.service-card h3 { font-size: 20px; margin: 0 0 10px; }
.service-card p { color: var(--muted); font-size: 15px; margin: 0 0 14px; }
.learn-more { font-weight: 600; font-size: 14px; }

.mini-point { padding: 18px; }
.mini-point h3 { font-size: 17px; margin: 0 0 6px; }
.mini-point p { color: var(--muted); font-size: 14px; margin: 0; }

/* ---------- Photo strip (hidden until real photos are ready) ---------- */
.photo-strip {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px;
  margin-top: 48px;
}
.photo-placeholder {
  aspect-ratio: 4 / 5; border-radius: 10px;
  background: linear-gradient(135deg, #d9c9b5, #b89a78);
  display: flex; align-items: flex-end; padding: 12px;
  color: #fff; font-size: 11px; line-height: 1.4;
}
.photo-placeholder span { background: rgba(31,27,23,0.55); padding: 4px 8px; border-radius: 6px; }

/* ---------- Notice box ---------- */
.notice-box {
  background: rgba(176,122,74,0.15); border-left: 3px solid var(--copper);
  padding: 18px 22px; border-radius: 8px; margin: 24px 0;
  color: #f0e4d4; font-size: 15px;
}
.notice-box.light-on-white { background: #fbf3e8; color: var(--ink); }
.notice-box p { margin: 0; }

.moving-info { max-width: 520px; margin-bottom: 24px; }

/* ---------- Timeline ---------- */
.timeline {
  list-style: none; padding: 0; margin: 40px 0 0;
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px;
}
.timeline-step {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 16px; text-align: center;
}
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--copper); color: #fff; font-weight: 700; margin-bottom: 10px;
}
.step-label { display: block; font-weight: 600; font-size: 14px; color: var(--charcoal); }

/* ---------- Training features ---------- */
.feature-grid {
  list-style: none; padding: 0; margin: 0 0 36px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.feature-item {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius); padding: 22px;
  display: flex; flex-direction: column; gap: 6px;
}
.feature-item strong { font-family: var(--serif); font-size: 17px; color: #fff; }
.feature-item span { font-size: 14px; color: #cdbfae; }

.eligibility {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius); padding: 14px 22px; margin: 0 auto 32px; max-width: 820px;
}
.eligibility summary { cursor: pointer; font-weight: 600; color: #fff; padding: 8px 0; }
.eligibility-body { padding: 12px 0 8px; }
.eligibility .check-list li { color: #e6d9c6; }
.eligibility-note { font-size: 13px; color: #cdbfae; margin: 12px 0 0; }

/* ---------- Why ---------- */
.brand-statement {
  margin: 56px 0 0; padding: 28px 32px;
  border-left: 3px solid var(--copper);
  background: var(--paper); border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--serif); font-size: 19px; color: var(--charcoal);
  font-style: italic;
}

/* ---------- Pricing ---------- */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.price-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; display: flex; flex-direction: column; gap: 12px;
}
.price-card--featured {
  border: 2px solid var(--copper);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.price-card h3 { margin: 0; font-size: 21px; }
.price-note { color: var(--muted); font-size: 12px; margin: 0; text-transform: uppercase; letter-spacing: 1.2px; }
.price-value { font-family: var(--serif); font-size: 26px; color: var(--charcoal); margin: 0; }

.check-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.check-list li { position: relative; padding-left: 24px; font-size: 15px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--copper); font-weight: 700; }

/* ---------- Testimonials (hidden until real reviews) ---------- */
.testimonial {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; margin: 0;
}
.testimonial blockquote { margin: 0 0 14px; font-family: var(--serif); font-size: 17px; color: var(--ink); }
.testimonial figcaption { font-size: 13px; color: var(--muted); }
.sample-note { font-size: 13px; color: var(--muted); font-style: italic; margin: -24px 0 32px; }
.google-slot { margin-top: 32px; font-size: 14px; color: var(--muted); }

/* ---------- About / Founder avatar ---------- */
.about-grid { display: grid; grid-template-columns: 320px 1fr; gap: 48px; align-items: center; }
.founder-avatar {
  width: 260px; aspect-ratio: 1 / 1; border-radius: 50%;
  background: linear-gradient(135deg, var(--walnut), var(--copper-dark));
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow);
}
.founder-avatar-initials {
  font-family: var(--serif); font-size: 72px; font-weight: 700; color: #faf6f0;
  letter-spacing: 2px;
}
.about-copy p { color: var(--ink); }
.stat-row { display: flex; gap: 32px; margin: 28px 0 0; flex-wrap: wrap; }
.stat dt { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.stat dd { margin: 4px 0 0; font-family: var(--serif); font-size: 20px; color: var(--charcoal); line-height: 1.3; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--paper); border: 1px solid var(--line); border-radius: 10px;
  padding: 0 20px;
}
.faq-item summary {
  cursor: pointer; padding: 18px 0; font-weight: 600; font-size: 16px;
  list-style: none; position: relative; padding-right: 30px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font-size: 22px; color: var(--copper); font-weight: 400;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p { color: var(--muted); padding: 0 0 18px; margin: 0; }

/* ---------- CTA band ---------- */
.cta-band { padding: 80px 0; }

/* ---------- Form ---------- */
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.enquiry-type {
  background: #fbf3e8; border: 1px solid var(--copper);
  border-radius: 999px; padding: 10px 18px; font-size: 14px; font-weight: 600;
  color: var(--walnut); margin: 0 0 8px; display: inline-block; align-self: flex-start;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.contact-form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; }
.contact-form input,
.contact-form select,
.contact-form textarea {
  padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 8px;
  font-family: inherit; font-size: 15px; background: var(--paper); color: var(--ink);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none; border-color: var(--copper); box-shadow: 0 0 0 3px rgba(176,122,74,0.2);
}
.consent { flex-direction: row !important; align-items: center; gap: 10px !important; font-weight: 500 !important; }
.consent input { width: 18px; height: 18px; }
.form-error { color: #b3392b; font-size: 14px; margin: 0; }
.form-note { font-size: 12px; color: var(--muted); text-align: center; margin: 0; }

/* ---------- Legal ---------- */
.legal-item {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: 10px; padding: 0 20px; margin-bottom: 10px;
}
.legal-item summary { cursor: pointer; padding: 14px 0; font-weight: 600; }
.legal-item p { color: var(--muted); padding: 0 0 16px; margin: 0; font-size: 14px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--charcoal); color: #cdbfae; padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr 1fr; gap: 32px; margin-bottom: 36px; }
.footer-brand { color: #fff; font-size: 24px; letter-spacing: 2px; }
.footer-tagline { font-size: 13px; }
.site-footer h4 { color: #fff; font-size: 14px; margin: 0 0 10px; letter-spacing: 1px; text-transform: uppercase; }
.site-footer p { font-size: 14px; margin: 4px 0; }
.site-footer a { color: #e6c9a8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; }
.footer-links { display: flex; gap: 20px; list-style: none; padding: 0; margin: 0 0 12px; }
.footer-links a { color: #e6c9a8; }
.disclaimer { font-size: 12px; color: #9b8d7d; max-width: 820px; }
.copyright { font-size: 12px; color: #9b8d7d; margin-top: 8px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%);
  background: var(--charcoal); color: #fff; padding: 14px 22px;
  border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  font-size: 14px; z-index: 100; border-left: 4px solid var(--copper);
  max-width: 90vw; text-align: center;
}

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid var(--copper); outline-offset: 2px; border-radius: 4px;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 960px) {
  .card-grid, .card-grid.three, .card-grid.six { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .price-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .founder-avatar { width: 200px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .photo-strip { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 760px) {
  .section { padding: 64px 0; }
  .nav-cta { display: none; }
  .nav-burger { display: flex; }

  .primary-nav {
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--warm-white); border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .primary-nav.open { max-height: 480px; }
  .primary-nav .nav-links { flex-direction: column; gap: 0; padding: 12px 24px 20px; }
  .primary-nav .nav-links li { border-bottom: 1px solid var(--line); }
  .primary-nav .nav-links li:last-child { border-bottom: 0; }
  .primary-nav .nav-links a { display: block; padding: 14px 0; font-size: 16px; }

  .two-cards { grid-template-columns: 1fr; }
  .card-grid, .card-grid.three, .card-grid.six { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .photo-strip { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { padding: 64px 24px; }
  .hero-ctas .btn { flex: 1 1 auto; }
}

@media (max-width: 420px) {
  .timeline { grid-template-columns: 1fr; }
  .brand-tagline { display: none; }
  .photo-strip { grid-template-columns: 1fr; }
  .hero-title { font-size: 30px; }
}

/* Cache-bust 20260926-2: prototype-only blocks (photo strip, sample testimonials) stay hidden until real content is ready. */
.prototype-only {
  display: none !important;
}


/* =========================================================
   WhatsApp 集成（v20260926-3）
   ========================================================= */
.contact-direct {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin: 0 0 24px;
}
.btn-whatsapp {
  background: #25D366;
  border: 1.5px solid #25D366;
  color: #fff;
}
.btn-whatsapp:hover,
.btn-whatsapp:focus-visible {
  background: #1eb85a;
  border-color: #1eb85a;
  color: #fff;
}

/* 悬浮按钮 */
.wa-float {
  position: fixed; right: 20px; bottom: 20px; z-index: 60;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 18px;
  background: #25D366; color: #fff;
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.22);
  font-weight: 600; font-size: 14px;
  text-decoration: none !important;
  transition: transform .15s ease, background .2s ease;
}
.wa-float:hover {
  background: #1eb85a; color: #fff;
  transform: translateY(-2px);
}
.wa-float:focus-visible {
  outline: 3px solid var(--copper);
  outline-offset: 2px;
}
.wa-float svg { width: 22px; height: 22px; flex: 0 0 auto; }

/* 视频模块（prototype-only 默认 display:none，这里只在未来取消隐藏时使用） */
.video-frame {
  margin-top: 32px;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.video-frame video { width: 100%; height: 100%; display: block; }

@media (max-width: 600px) {
  .wa-float {
    width: 56px; height: 56px;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
    right: 16px; bottom: 16px;
  }
  .wa-float-text { display: none; }
  .toast { bottom: 84px; }
}