:root {
  --gold: #c9a86a;
  --gold-light: #e3c98f;
  --gold-soft: rgba(201, 168, 106, .14);
  --wood: #8a6f4d;
  --dark: #0f1317;
  --dark-2: #171c22;
  --dark-3: #212830;
  --text: #ece9e3;
  --text-dim: #a6afb9;
  --line: #2b333d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(1100px 420px at 50% -120px, rgba(201, 168, 106, .07), transparent 60%),
    var(--dark);
  color: var(--text);
  line-height: 1.7;
}

::selection { background: rgba(201, 168, 106, .28); color: #fff; }

a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-light); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 19, 23, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 20px; font-weight: 700; letter-spacing: 2px;
  color: var(--text);
}
.logo span { color: var(--gold); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links button, .nav-links a.nav-link {
  background: none; border: none; color: var(--text-dim);
  font-size: 15px; cursor: pointer; padding: 4px 0;
  border-bottom: 2px solid transparent; transition: .2s;
}
.nav-links button:hover, .nav-links a.nav-link:hover { color: var(--text); }
.nav-links button.active, .nav-links a.nav-link.active { color: var(--gold); border-color: var(--gold); }
@media (max-width: 680px) {
  .nav-inner { height: 56px; }
  .logo { font-size: 17px; letter-spacing: 1px; }
  .nav-links { gap: 14px; }
  .nav-links button, .nav-links a.nav-link { font-size: 13px; }
}
@media (max-width: 560px) {
  .nav-inner { flex-wrap: wrap; height: auto; padding: 10px 0; row-gap: 4px; }
  .nav-links { width: 100%; justify-content: center; flex-wrap: wrap; gap: 12px; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 90px 0 80px;
  text-align: center;
  background:
    radial-gradient(1200px 500px at 70% -10%, rgba(201,168,106,.12), transparent 60%),
    radial-gradient(900px 400px at 10% 110%, rgba(201,168,106,.08), transparent 60%);
  border-bottom: 1px solid var(--line);
}
.hero h1 { font-size: 46px; font-weight: 800; letter-spacing: 6px; }
.hero h1 span { color: var(--gold); }
.hero .sub { margin-top: 14px; font-size: 18px; color: var(--text-dim); letter-spacing: 3px; }
.hero .tags { margin-top: 26px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .tags span {
  border: 1px solid var(--line); color: var(--text-dim);
  padding: 6px 18px; border-radius: 999px; font-size: 14px;
}
.hero .cta { margin-top: 38px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 34px; border-radius: 4px;
  font-size: 15px; letter-spacing: 2px; cursor: pointer;
  border: 1px solid var(--gold); transition: .2s;
}
.btn-gold { background: linear-gradient(135deg, var(--gold-light), var(--gold)); color: #101418; font-weight: 600; box-shadow: 0 4px 18px rgba(201, 168, 106, .22); }
.btn-gold:hover { background: linear-gradient(135deg, var(--gold-light), var(--gold)); color: #101418; transform: translateY(-2px); box-shadow: 0 8px 26px rgba(201, 168, 106, .3); }
.btn-ghost { background: transparent; color: var(--gold); }
.btn-ghost:hover { background: rgba(201,168,106,.1); }

/* ---------- Section ---------- */
.section { padding: 72px 0; border-bottom: 1px solid var(--line); }
.section[id], article[id] { scroll-margin-top: 84px; }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .en {
  font-size: 13px; letter-spacing: 4px; color: var(--gold);
  text-transform: uppercase;
}
.section-head .en::after {
  content: ""; display: block; width: 42px; height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
  margin: 12px auto 0;
}
.section-head h2 { font-size: 32px; margin-top: 6px; letter-spacing: 2px; }
.section-head p { margin-top: 10px; color: var(--text-dim); max-width: 640px; margin-left: auto; margin-right: auto; }

/* ---------- Tabs ---------- */
.tab-bar {
  display: flex; justify-content: center; gap: 16px;
  margin-bottom: 44px; flex-wrap: wrap;
}
.tab-btn {
  background: var(--dark-2); border: 1px solid var(--line);
  color: var(--text-dim); padding: 16px 14px; border-radius: 8px;
  cursor: pointer; transition: .2s; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px;
  flex: 1; max-width: 230px; min-width: 120px; white-space: nowrap;
  font-family: inherit; font-size: 16px; font-weight: 600; letter-spacing: 1px;
}
.tab-btn:hover { border-color: var(--wood); color: var(--text); transform: translateY(-2px); }
.tab-btn.active { background: var(--gold); border-color: var(--gold); color: #101418; box-shadow: 0 8px 24px rgba(201, 168, 106, .28); }
.tab-ico { font-size: 26px; line-height: 1; }
.tab-title { font-size: 17px; font-weight: 600; letter-spacing: 1px; color: var(--text); }
.tab-sub { font-size: 12px; letter-spacing: .5px; color: var(--text-dim); }
.tab-btn.active .tab-title { color: #101418; }
.tab-btn.active .tab-sub { color: rgba(16,20,24,.7); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn .35s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; } }

/* ---------- Service Modules ---------- */
.module {
  position: relative; overflow: hidden;
  border: 1px solid rgba(201, 168, 106, .5); border-radius: 18px;
  padding: 46px 42px 50px;
  background:
    linear-gradient(180deg, rgba(201, 168, 106, .07), rgba(201, 168, 106, 0) 280px),
    var(--dark-2);
  box-shadow: 0 30px 70px rgba(0, 0, 0, .42), inset 0 0 0 1px rgba(201, 168, 106, .12);
  transition: border-color .25s, box-shadow .25s;
}
.module:hover {
  border-color: rgba(201, 168, 106, .8);
  box-shadow: 0 34px 80px rgba(0, 0, 0, .48), inset 0 0 0 1px rgba(201, 168, 106, .2), 0 0 40px rgba(201, 168, 106, .08);
}
.module + .module { margin-top: 60px; }
.module::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; z-index: 2;
  background: linear-gradient(90deg, var(--gold), rgba(201, 168, 106, .15) 85%);
}
.module::after {
  content: ""; position: absolute; top: -90px; right: -90px; z-index: 0;
  width: 280px; height: 280px; border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(201, 168, 106, .13), transparent 70%);
}
.module > * { position: relative; z-index: 1; }
.module-head {
  display: flex; align-items: center; gap: 26px;
  padding-bottom: 34px; margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.module-num {
  flex: none; font-size: 56px; font-weight: 800; line-height: 1;
  letter-spacing: 2px; color: rgba(201, 168, 106, .16);
}
@supports (-webkit-text-stroke: 1px red) {
  .module-num { color: transparent; -webkit-text-stroke: 1px rgba(201, 168, 106, .55); }
}
.module-title { flex: 1; min-width: 0; }
.module-eyebrow { font-size: 12px; letter-spacing: 4px; text-transform: uppercase; color: var(--gold); }
.module-title h3 { font-size: 28px; letter-spacing: 2px; margin: 8px 0; }
.module-title p { color: var(--text-dim); font-size: 15px; max-width: 620px; }
.module-badge {
  flex: none; width: 62px; height: 62px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 27px;
  background: radial-gradient(circle at 30% 25%, rgba(201, 168, 106, .3), rgba(201, 168, 106, .06));
  border: 1px solid rgba(201, 168, 106, .4);
  box-shadow: 0 8px 24px rgba(201, 168, 106, .15);
}
.module-badge svg { width: 30px; height: 30px; display: block; }
.module .card { background: var(--dark-3); }
.sub-head { margin-bottom: 26px; }
.module > .grid + .sub-head, .module > .grid-2 + .sub-head { margin-top: 56px; }
.sub-head h4 { font-size: 20px; letter-spacing: 1px; }
.sub-head h4::before {
  content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 12px;
  background: var(--gold); border-radius: 2px; transform: translateY(-2px) rotate(45deg);
}
.sub-head p { color: var(--text-dim); font-size: 14px; margin-top: 8px; max-width: 760px; }

@media (max-width: 720px) {
  .module { padding: 32px 22px 38px; border-radius: 14px; }
  .module-head { flex-wrap: wrap; gap: 16px; padding-bottom: 26px; margin-bottom: 30px; }
  .module-num { font-size: 40px; }
  .module-badge { width: 50px; height: 50px; font-size: 22px; }
  .module-title h3 { font-size: 23px; }
  .module > .grid + .sub-head, .module > .grid-2 + .sub-head { margin-top: 44px; }
}

/* ---------- 教室实拍 ---------- */
.room-gallery {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  margin-top: 40px;
}
.room-img { margin: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--dark-2); }
.room-img img { width: 100%; height: 300px; object-fit: cover; display: block; }
.room-img figcaption {
  padding: 12px 16px; font-size: 13px; color: var(--text-dim); letter-spacing: 1px;
}
@media (max-width: 900px) {
  .room-gallery { grid-template-columns: 1fr; }
  .room-img img { height: 220px; }
}

/* ---------- Cards ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 900px) { .grid, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--dark-2); border: 1px solid var(--line);
  border-radius: 10px; padding: 30px 28px; transition: .25s;
  display: flex; flex-direction: column;
}
.card:hover {
  border-color: rgba(201, 168, 106, .55); transform: translateY(-4px);
  box-shadow: 0 14px 34px rgba(0, 0, 0, .4), 0 0 0 1px rgba(201, 168, 106, .18);
}
.card .icon { font-size: 30px; color: var(--gold); }
.card .icon svg { width: 30px; height: 30px; display: block; }
.card h3 { margin: 16px 0 10px; font-size: 19px; }
.card p { color: var(--text-dim); font-size: 14px; }
.card .price { margin-top: auto; padding-top: 16px; font-size: 22px; font-weight: 700; color: var(--gold); }
.card .price small { font-size: 13px; font-weight: 400; color: var(--text-dim); }
.card ul { margin-top: 12px; list-style: none; }
.card ul li { color: var(--text-dim); font-size: 14px; padding: 3px 0; }
.card ul li::before { content: "· "; color: var(--gold); }
.card-cta { margin-top: auto; padding-top: 18px; }

/* ---------- Knowledge base ---------- */
.kb-lead { color: var(--text-dim); font-size: 15px; line-height: 1.8; margin-bottom: 28px; max-width: 780px; }
.kb-table { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 13.5px; }
.kb-table th, .kb-table td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; color: var(--text-dim); vertical-align: top; }
.kb-table th { background: var(--dark-3); color: var(--text); font-weight: 600; }
.kb-note { margin-top: 14px; padding: 12px 14px; border-left: 3px solid var(--gold); background: rgba(201, 168, 106, .07); border-radius: 4px; color: var(--text-dim); font-size: 13.5px; line-height: 1.7; }
.kb-note strong { color: var(--gold-light); }
.kb-fig { margin: 16px 0 4px; }
.kb-fig img { width: 100%; height: auto; display: block; background: var(--dark); border: 1px solid var(--line); border-radius: 8px; padding: 8px; }
.kb-fig figcaption { margin-top: 8px; font-size: 12.5px; color: var(--text-dim); text-align: center; }
.kb-chords { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 16px; }
.kb-chords img { width: 100%; height: auto; display: block; background: var(--dark); border: 1px solid var(--line); border-radius: 8px; padding: 4px; }
@media (max-width: 640px) { .kb-chords { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Free Tools ---------- */
.tool {
  background: var(--dark-2); border: 1px solid rgba(201, 168, 106, .35);
  border-radius: 16px; padding: 36px 32px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}
.tool + .tool { margin-top: 24px; }
.tool-readout { text-align: center; margin-bottom: 4px; }
.tool-readout .big {
  font-size: 64px; font-weight: 800; line-height: 1; color: var(--gold);
  letter-spacing: 2px; font-variant-numeric: tabular-nums;
}
.tool-readout .label { margin-top: 8px; color: var(--text-dim); font-size: 13px; letter-spacing: 3px; }
.tool-controls { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; align-items: flex-end; margin-top: 24px; }
.tool-field { display: flex; flex-direction: column; gap: 6px; }
.tool-field label { font-size: 13px; color: var(--text-dim); }
.tool-field select, .tool-field input[type=number] {
  background: var(--dark); border: 1px solid var(--line); color: var(--text);
  border-radius: 6px; padding: 9px 12px; font-size: 14px; font-family: inherit; min-width: 120px;
}
.tool-field input[type=range] { width: 200px; accent-color: var(--gold); }
.tool-btn {
  background: var(--dark); border: 1px solid var(--line); color: var(--text);
  border-radius: 8px; padding: 11px 20px; font-size: 15px; font-family: inherit;
  cursor: pointer; transition: .2s; letter-spacing: 1px;
}
.tool-btn:hover { border-color: var(--gold); color: var(--gold); }
.tool-btn.primary { background: linear-gradient(135deg, var(--gold-light), var(--gold)); border-color: var(--gold); color: #101418; font-weight: 700; }
.tool-btn.primary:hover { color: #101418; transform: translateY(-1px); }
.tool-hint { margin-top: 24px; text-align: center; color: var(--text-dim); font-size: 13px; line-height: 1.7; }

.beats { display: flex; gap: 14px; justify-content: center; align-items: center; margin: 28px 0 2px; min-height: 26px; }
.beat { width: 18px; height: 18px; border-radius: 50%; background: var(--dark); border: 1px solid var(--line); transition: transform .08s, background .08s, box-shadow .08s; }
.beat.on { background: var(--gold); border-color: var(--gold); box-shadow: 0 0 20px rgba(201, 168, 106, .75); transform: scale(1.35); }
.beat.accent { width: 22px; height: 22px; }
.beat.accent.on { background: var(--gold-light); }

.tuner-note { font-size: 92px; font-weight: 800; line-height: 1; color: var(--text); letter-spacing: 2px; }
.tuner-note small { font-size: 30px; color: var(--gold); vertical-align: super; margin-left: 4px; }
.tuner-note.in-tune { color: #7ecb8a; }
.tuner-gauge { max-width: 380px; margin: 6px auto 0; }
.tuner-gauge svg { width: 100%; height: auto; display: block; }
.tuner-meta { display: flex; gap: 26px; justify-content: center; flex-wrap: wrap; margin-top: 16px; color: var(--text-dim); font-size: 14px; }
.tuner-meta b { color: var(--text); font-variant-numeric: tabular-nums; }
.string-btn { padding: 9px 15px; font-weight: 600; }
.string-btn.active { border-color: var(--gold); color: var(--gold); }

.chord-filters { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-bottom: 28px; }
.chord-filter {
  background: var(--dark); border: 1px solid var(--line); color: var(--text-dim);
  border-radius: 999px; padding: 8px 18px; font-size: 14px; font-family: inherit; cursor: pointer; transition: .2s;
}
.chord-filter:hover { color: var(--text); border-color: var(--wood); }
.chord-filter.active { background: var(--gold); border-color: var(--gold); color: #101418; font-weight: 600; }
.chord-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 18px; }
.chord-item { background: var(--dark); border: 1px solid var(--line); border-radius: 12px; padding: 14px 12px 12px; text-align: center; transition: .2s; }
.chord-item:hover { border-color: rgba(201, 168, 106, .5); transform: translateY(-3px); }
.chord-item svg { width: 100%; height: auto; display: block; }
.chord-item .cname { margin-top: 8px; font-size: 15px; font-weight: 700; color: var(--gold); }
.chord-item .play { margin-top: 10px; width: 100%; padding: 7px 0; font-size: 13px; }
.kb-steps { margin: 0; padding-left: 22px; }
.kb-steps li { color: var(--text-dim); font-size: 15px; line-height: 1.9; padding: 3px 0; }
.kb-steps li::marker { color: var(--gold); font-weight: 700; }
.faq-item { border-top: 1px solid var(--line); padding: 16px 0; }
.faq-item:first-of-type { border-top: none; padding-top: 0; }
.faq-item h3 { font-size: 16px; color: var(--text); margin-bottom: 8px; }
.faq-item p { color: var(--text-dim); font-size: 14px; line-height: 1.8; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }
.about-photo {
  border-radius: 8px; overflow: hidden; border: 1px solid var(--line);
  position: relative; aspect-ratio: 4/5;
}
.about-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about-photo .ph {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, var(--dark-3), var(--dark-2));
  color: var(--text-dim); font-size: 15px; letter-spacing: 2px;
}
.about-text h3 { font-size: 22px; margin-bottom: 16px; color: var(--gold); }
.about-text p { margin-bottom: 14px; color: var(--text-dim); }
.about-text strong { color: var(--text); }
.about-credits { margin-top: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.about-credits div { background: var(--dark-2); border: 1px solid var(--line); padding: 12px 16px; border-radius: 6px; font-size: 14px; color: var(--text-dim); }
.about-credits strong { color: var(--gold); }

/* ---------- Showcase (videos) ---------- */
.showcase { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 900px) { .showcase { grid-template-columns: 1fr; } }
.video-card { position: relative; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); aspect-ratio: 16/9; background: var(--dark-3); }
.video-card img, .video-card .ph { width: 100%; height: 100%; object-fit: cover; display: flex; align-items: center; justify-content: center; color: var(--text-dim); font-size: 13px; }
.video-card video { width: 100%; height: 100%; object-fit: cover; display: block; background: #000; }
.video-card .ph { background: linear-gradient(160deg, var(--dark-3), #141a20); }
.video-card .ph .play { font-size: 44px; color: var(--gold); margin-bottom: 8px; }
.video-card .cap { position: absolute; left: 0; right: 0; bottom: 0; padding: 24px 16px 10px; background: linear-gradient(transparent, rgba(0,0,0,.8)); font-size: 14px; pointer-events: none; }

/* ---------- Booking ---------- */
.book-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: stretch; }
@media (max-width: 900px) { .book-grid { grid-template-columns: 1fr; } }
.book-form { background: var(--dark-2); border: 1px solid var(--line); border-radius: 8px; padding: 34px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; color: var(--text-dim); margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--dark); border: 1px solid var(--line);
  color: var(--text); border-radius: 4px; padding: 11px 14px; font-size: 15px;
  font-family: inherit; transition: .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--gold);
}
.field textarea { resize: vertical; min-height: 80px; }
.form-msg { margin-top: 14px; font-size: 14px; min-height: 22px; }
.form-msg.ok { color: #7ecb8a; }
.form-msg.err { color: #e07a7a; }

.qr-box {
  background: var(--dark-2); border: 1px solid var(--line); border-radius: 8px;
  padding: 34px; text-align: center;
  display: flex; flex-direction: column; justify-content: center;
}
.qr-box img { width: 180px; height: 180px; border-radius: 6px; border: 1px solid var(--line); display: block; margin: 0 auto; }
.qr-box h4 { margin: 18px 0 6px; font-size: 17px; }
.qr-box p { color: var(--text-dim); font-size: 14px; }
.contact-info { margin-top: 22px; text-align: left; }
.contact-info div { padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 14px; color: var(--text-dim); }
.contact-info strong { color: var(--text); font-weight: 500; margin-right: 8px; }

/* ---------- Footer ---------- */
.footer {
  padding: 40px 0 50px; text-align: center; color: var(--text-dim); font-size: 13px;
}
.footer .nav-links { justify-content: center; margin-bottom: 16px; }
.footer a { color: var(--text-dim); }
.footer a:hover { color: var(--gold); }