@font-face {
  font-family: "DM Sans";
  src: url("/assets/dm-sans.woff2") format("woff2");
  font-weight: 100 1000;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Serif";
  src: url("/assets/instrument-serif.woff2") format("woff2");
  font-display: swap;
}
:root {
  color-scheme: light;
  --paper: #f6f3ec;
  --white: #fcfaf5;
  --ink: #28241f;
  --muted: #5d554d;
  --accent: #663743;
  --line: #d6cfc4;
  --tint: #ece5da;
  --display: "Instrument Serif", Georgia, serif;
  --body: "DM Sans", system-ui, sans-serif;
}
html:lang(yue) { --display: "Songti TC", "Noto Serif CJK TC", "PMingLiU", serif; }
html:lang(zh) { --display: "Songti SC", "Noto Serif CJK SC", SimSun, serif; }
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 1rem/1.6 var(--body); }
h1, h2, h3, h4, p, figure { margin: 0; }
h1, h2, h3, .brand { font-family: var(--display); font-weight: 400; }
h1 { font-size: clamp(4.2rem, 8.5vw, 8.7rem); line-height: .87; letter-spacing: -.035em; }
h2 { font-size: clamp(3.1rem, 5.7vw, 5.7rem); line-height: .92; letter-spacing: -.023em; }
h3 { font-size: clamp(1.8rem, 2.6vw, 2.55rem); line-height: 1.03; }
a { color: inherit; text-underline-offset: .24em; }
button, input, select, textarea { font: inherit; }
button, summary { cursor: pointer; }
button:disabled, textarea:disabled { opacity: .6; cursor: wait; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
[hidden] { display: none !important; }
:target { scroll-margin-top: 1.4rem; }
.wrap { width: min(100% - 2 * clamp(1.25rem, 5.6vw, 5rem), 1210px); margin-inline: auto; }
.section { padding-block: clamp(3.8rem, 8.1vw, 7.7rem); }
.sr-only, .skip:not(:focus) { position: absolute; width: 1px; height: 1px; clip-path: inset(50%); overflow: hidden; white-space: nowrap; }
.skip:focus { position: absolute; z-index: 2; left: .75rem; top: .75rem; padding: .5rem .9rem; background: var(--white); }

.site-header { border-bottom: 1px solid var(--line); }
.nav, .footer { display: flex; align-items: center; justify-content: space-between; min-height: 76px; gap: 1rem; }
.brand { font-size: 1.86rem; text-decoration: none; white-space: nowrap; line-height: 1; }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: .36rem clamp(1rem, 2.4vw, 2.3rem); }
.nav nav { display: flex; flex-wrap: wrap; align-items: center; gap: clamp(.75rem, 3vw, 2.45rem); font-size: .88rem; }
.nav .language-nav { gap: .72rem; font-size: .79rem; color: var(--muted); }
.nav nav a { text-decoration: none; }
.nav nav a:hover, .nav nav [aria-current="page"] { text-decoration: underline; }
.nav .nav-contact { color: var(--accent); font-weight: 700; }

.hero { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: clamp(2rem, 7.2vw, 7rem); padding-block: clamp(2.9rem, 6vw, 5.8rem); border-bottom: 1px solid var(--line); }
.eyebrow { margin-bottom: clamp(1.2rem, 2.7vw, 2rem); font-size: .73rem; letter-spacing: .115em; font-weight: 750; text-transform: uppercase; color: var(--accent); }
.intro { max-width: 32rem; margin-top: 1.5rem; color: var(--muted); font-size: clamp(1.05rem, 1.5vw, 1.25rem); }
.languages { color: var(--muted); font-size: .88rem; margin-top: 1.35rem; }
.hero-photo { width: 100%; aspect-ratio: 4 / 4.65; overflow: hidden; background: var(--tint); }
.hero-photo img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: 50% 62%; transform: scale(2.65); transform-origin: 51% 64%; filter: grayscale(1) contrast(.94); }

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: .72rem 1.25rem; margin-top: 1.5rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: .62rem 1.07rem; border: 1px solid var(--accent); border-radius: 2px; background: var(--accent); color: var(--white); font-size: .89rem; font-weight: 700; text-decoration: none; }
.button:hover { background: #502936; border-color: #502936; }
.text-link { display: inline-block; padding-block: .45rem; color: var(--accent); font-size: .93rem; font-weight: 700; }
.text-link:hover { text-decoration-thickness: 2px; }

.split { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(2rem, 7vw, 7rem); align-items: start; }
.section-note { max-width: 22rem; margin-top: 1.1rem; color: var(--muted); }
.lesson { display: grid; grid-template-columns: minmax(0, 1fr) max-content; gap: 1rem; align-items: baseline; padding-block: 1.32rem; border-top: 1px solid var(--line); }
.lesson p { color: var(--muted); margin-top: .38rem; max-width: 30rem; }
.lesson a { color: var(--accent); font-size: .83rem; font-weight: 700; }
.lesson a.lesson-title-link { color: var(--ink); font: inherit; text-decoration-thickness: 1px; }
.lesson a.lesson-title-link:hover { color: var(--accent); }
.disclosure { padding-block: .9rem; border-block: 1px solid var(--line); color: var(--muted); }
.disclosure summary { color: var(--accent); font-size: .92rem; font-weight: 700; padding-block: .32rem; }
.clips { display: grid; gap: .85rem; margin-top: .65rem; }
.clips h4 { font-size: .88rem; margin-bottom: .3rem; }
.clips audio { display: block; width: min(100%, 360px); height: 40px; }
.about-copy > p { max-width: 37rem; margin-bottom: 1rem; color: var(--muted); }
.about-copy a { color: var(--accent); }
.background { margin: .6rem 0 0; padding-left: 1.2rem; }
.background li { margin-bottom: .45rem; }

textarea { resize: vertical; }
textarea::placeholder { color: var(--muted); }
.form-note, #form-status { margin-top: .78rem; color: var(--muted); font-size: .82rem; }
#form-status:empty { margin: 0; }
.form-trap { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.lesson-result { margin-top: 1rem; padding: 1.2rem; background: var(--white); border: 1px solid var(--line); }
.lesson-result p { margin-top: .7rem; white-space: pre-wrap; overflow-wrap: anywhere; }

.contact-section { border-block: 1px solid var(--line); background: var(--tint); }
.email { margin-top: .75rem; overflow-wrap: anywhere; }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.fields .full { grid-column: 1 / -1; }
.fields label { font-size: .88rem; font-weight: 700; }
.fields small { color: var(--muted); font-weight: 400; }
.fields :is(input, textarea, select) { display: block; width: 100%; min-height: 45px; margin-top: .25rem; padding: .55rem .7rem; color: var(--ink); background: var(--white); border: 1px solid #a89b8a; border-radius: 2px; font-size: 1rem; font-weight: 400; }
.footer { min-height: 95px; font-size: .84rem; color: var(--muted); }
.footer .brand { color: var(--ink); }
.testimonials { padding-block: clamp(3rem, 7vw, 6.25rem); border-bottom: 1px solid var(--line); }
.testimonials h1 { margin-bottom: clamp(2rem, 4vw, 3.5rem); font-size: clamp(3.7rem, 8vw, 7.6rem); }
.testimonials-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(2rem, 6vw, 6rem); }
.testimonial { border-top: 1px solid var(--line); padding-block: clamp(1.35rem, 2.8vw, 2.35rem); }
.testimonial blockquote { margin: 0; max-width: 37ch; font: 400 clamp(1.5rem, 2.45vw, 2.12rem)/1.16 var(--display); }
.testimonial figcaption { margin-top: .9rem; color: var(--accent); font-size: .86rem; font-weight: 700; }
.home-testimonials h2 { margin-bottom: clamp(1.6rem, 3.5vw, 2.75rem); }
.home-testimonials-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(1.6rem, 3.5vw, 3rem); }
.home-testimonials .testimonial blockquote { font-size: clamp(1.45rem, 2.05vw, 1.88rem); }
html:is(:lang(yue), :lang(zh)) .testimonial blockquote { font-size: clamp(1.16rem, 1.8vw, 1.55rem); line-height: 1.65; }
html:is(:lang(yue), :lang(zh)) h1 { font-size: clamp(2.9rem, 6.7vw, 6.25rem); line-height: 1.08; }
html:is(:lang(yue), :lang(zh)) h2 { font-size: clamp(2.45rem, 4.5vw, 4.5rem); line-height: 1.12; }
.error-page { padding-block: 3rem; }
.error-page h1 { margin-bottom: 1rem; }

.lesson-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(0, .72fr);
  align-items: center;
  gap: clamp(1.75rem, 6vw, 6rem);
  padding-block: clamp(3.2rem, 8vw, 7.6rem);
  border-bottom: 1px solid var(--line);
}
.lesson-hero h1 { max-width: 13ch; font-size: clamp(3.3rem, 6.5vw, 6.6rem); line-height: .94; }
.lesson-example { padding: clamp(1.25rem, 3vw, 2.3rem); background: var(--white); border: 1px solid var(--line); }
.lesson-example .eyebrow { margin-bottom: .85rem; }
.lesson-example h2 { font-size: clamp(2.1rem, 3.8vw, 3.55rem); line-height: 1.02; }
.lesson-example > p + h2 + p, .lesson-step p { margin-top: .65rem; color: var(--muted); }
.lesson-example audio { display: block; width: 100%; max-width: 24rem; height: 42px; margin-top: 1.25rem; }
.lesson-step, .lesson-reading { border-top: 1px solid var(--line); padding-block: 1.15rem; }
.lesson-reading ul { display: grid; gap: .4rem; margin: .65rem 0 0; padding-inline-start: 1.25em; }
.lesson-reading a { color: var(--accent); }
.focus-label { font-size: .88rem; font-weight: 700; }
html:is(:lang(yue), :lang(zh)) .lesson-hero h1 { max-width: 13em; font-size: clamp(2.5rem, 5.5vw, 5.2rem); }
html:is(:lang(yue), :lang(zh)) .lesson-page :is(h1, h2, h3) { line-height: 1.15; letter-spacing: 0; }
html:is(:lang(yue), :lang(zh)) .lesson-page :is(.lesson-method, .contact-section) h2 { font-size: clamp(2.2rem, 4.4vw, 4rem); }

@media (max-width: 750px) {
  .hero, .split, .lesson-hero { grid-template-columns: 1fr; gap: 1.65rem; }
  .testimonials-grid { grid-template-columns: minmax(0, 1fr); }
  .home-testimonials-grid { grid-template-columns: minmax(0, 1fr); }
  .hero { align-items: start; padding-block: 2.55rem 2rem; }
  .hero-photo { aspect-ratio: 1.12; max-width: 31rem; }
  .hero-photo img { transform: scale(2.25); transform-origin: 51% 67%; }
  .wide-break { display: none; }
  .nav, .footer { min-height: 65px; }
  .nav { padding-block: .6rem; }
  .nav-links { flex-direction: column; align-items: flex-end; }
  .nav nav { justify-content: flex-end; }
}
@media (max-width: 420px) {
  .nav nav { justify-content: flex-end; gap: .18rem .65rem; font-size: .82rem; }
  .brand { font-size: 1.58rem; }
  .lesson { grid-template-columns: 1fr; gap: .45rem; }
  .lesson a { width: fit-content; padding-block: .2rem; }
  .fields { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }