:root {
  --ink: #0c0c0d;
  --ink-soft: #19191b;
  --paper: #f5f2ea;
  --paper-bright: #fbfaf6;
  --red: #e13d31;
  --red-dark: #b82a22;
  --jade: #98bdad;
  --line: rgba(12, 12, 13, 0.16);
  --line-dark: rgba(255, 255, 255, 0.16);
  --muted: #686762;
  --container: 1240px;
  --radius: 2px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
body::selection { background: var(--red); color: #fff; }
img { display: block; width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.02; letter-spacing: -0.045em; }
h1 { font-size: clamp(3.6rem, 7.3vw, 7.3rem); font-weight: 650; margin-bottom: 28px; }
h2 { font-size: clamp(2.75rem, 5vw, 5.15rem); font-weight: 620; margin-bottom: 26px; }
h3 { font-size: 1.55rem; font-weight: 650; }
em { color: var(--red); font-family: Georgia, "Times New Roman", serif; font-weight: 400; }

.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.section { padding: 120px 0; }
.section-dark { color: #fff; background: var(--ink); }
.skip-link { position: fixed; left: 16px; top: -100px; z-index: 9999; padding: 12px 16px; background: #fff; color: #000; }
.skip-link:focus { top: 12px; }

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  color: #fff;
  border-bottom: 1px solid var(--line-dark);
}
.site-header.is-sticky {
  position: fixed;
  background: rgba(12, 12, 13, 0.9);
  backdrop-filter: blur(18px);
  animation: header-in 0.28s ease both;
}
@keyframes header-in { from { transform: translateY(-100%); } }
.nav-wrap { height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; min-width: max-content; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; background: var(--red); color: #fff; font-family: Georgia, serif; font-size: 1.25rem; }
.brand b, .brand small { display: block; }
.brand b { font-size: 0.96rem; line-height: 1.15; }
.brand small { margin-top: 3px; color: rgba(255,255,255,.58); font-size: 0.7rem; line-height: 1.1; letter-spacing: .08em; text-transform: uppercase; }
.desktop-nav { display: flex; align-items: center; gap: clamp(18px, 2.5vw, 40px); margin-left: auto; }
.desktop-nav a { position: relative; color: rgba(255,255,255,.72); font-size: .88rem; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; bottom: -7px; width: 100%; height: 1px; background: var(--red); transform: scaleX(0); transform-origin: left; transition: transform .25s ease; }
.desktop-nav a:hover { color: #fff; }
.desktop-nav a:hover::after { transform: scaleX(1); }

.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 56px; padding: 0 22px; border: 1px solid transparent; border-radius: var(--radius); font-weight: 700; font-size: .95rem; transition: transform .22s ease, background .22s ease, border-color .22s ease, color .22s ease; cursor: pointer; }
.button:hover { transform: translateY(-2px); }
.button:focus-visible, .text-link:focus-visible, .tabs button:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid var(--jade); outline-offset: 4px; }
.button-small { min-height: 42px; padding-inline: 17px; gap: 14px; font-size: .84rem; }
.button-light { color: var(--ink); background: #fff; }
.button-light:hover { background: var(--paper); }
.button-red { color: #fff; background: var(--red); }
.button-red:hover { background: #f04b3f; }
.button-dark { color: #fff; background: var(--ink); }
.button-dark:hover { background: #2a2a2d; }
.button-outline { border-color: var(--ink); background: transparent; }
.button-outline:hover { color: #fff; background: var(--ink); }
.button-wide { min-width: min(100%, 380px); }
.text-link { display: inline-flex; align-items: center; gap: 15px; padding: 9px 0; border-bottom: 1px solid rgba(255,255,255,.35); font-weight: 650; }
.text-link:hover { border-color: var(--red); }
.text-link-light { color: #fff; }

.hero { position: relative; overflow: hidden; padding: 124px 0 0; }
.hero::before { content: ""; position: absolute; inset: 0; opacity: .08; pointer-events: none; background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px); background-size: 54px 54px; mask-image: linear-gradient(to bottom, black, transparent 85%); }
.hero::after { content: "懂"; position: absolute; right: -1vw; bottom: -14vw; color: rgba(255,255,255,.025); font-family: Georgia, serif; font-size: min(44vw, 600px); line-height: 1; pointer-events: none; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(390px, .82fr); align-items: center; gap: clamp(52px, 7vw, 110px); }
.hero-copy { padding-bottom: 24px; }
.eyebrow, .kicker { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 28px; color: var(--red); font-size: .74rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.eyebrow { color: rgba(255,255,255,.64); }
.eyebrow span { width: 34px; height: 2px; background: var(--red); }
.hero h1 { max-width: 790px; margin-bottom: 22px; font-size: clamp(3.4rem, 6.2vw, 6.2rem); }
.hero h1 em { display: inline; }
.hero .eyebrow { margin-bottom: 20px; }
.hero-lead { max-width: 690px; margin-bottom: 25px; color: rgba(255,255,255,.69); font-size: clamp(1.02rem, 1.35vw, 1.2rem); line-height: 1.5; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 28px; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 10px 26px; margin: 22px 0 0; padding: 0; list-style: none; color: rgba(255,255,255,.58); font-size: .86rem; }
.hero-notes li { display: flex; align-items: center; gap: 9px; }
.hero-notes li::before { content: ""; width: 5px; height: 5px; background: var(--jade); border-radius: 50%; }
.hero-visual { position: relative; align-self: stretch; min-height: 560px; }
.hero-photo { position: absolute; inset: 0 0 0 34px; margin: 0; overflow: hidden; box-shadow: var(--shadow); }
.hero-photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.75), transparent 42%); }
.hero-photo img { height: 100%; object-fit: cover; object-position: 56% center; filter: saturate(.86) contrast(1.04); }
.hero-photo figcaption { position: absolute; left: 30px; bottom: 27px; z-index: 1; }
.hero-photo figcaption span, .hero-photo figcaption b { display: block; }
.hero-photo figcaption span { color: rgba(255,255,255,.62); font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; }
.hero-photo figcaption b { margin-top: 5px; font-family: Georgia, serif; font-size: 1.55rem; font-weight: 400; }
.hanzi-rail { position: absolute; left: 0; top: 35px; z-index: 3; writing-mode: vertical-rl; color: rgba(255,255,255,.72); font-family: Georgia, serif; font-size: 1rem; letter-spacing: .35em; }
.hero-card { position: absolute; z-index: 4; display: grid; padding: 18px 20px; background: var(--paper-bright); color: var(--ink); box-shadow: 0 12px 36px rgba(0,0,0,.16); }
.hero-card b { font-size: 1.08rem; }
.hero-card span { color: var(--muted); font-size: .75rem; }
.hero-card-top { top: 38px; right: -30px; min-width: 146px; }
.hero-card-bottom { left: -14px; bottom: 28px; min-width: 214px; grid-template-columns: 8px 1fr; column-gap: 9px; }
.hero-card-bottom span:last-child { grid-column: 2; }
.status-dot { width: 7px; height: 7px; margin-top: 6px; background: #2f9e62; border-radius: 50%; }
.proof-strip { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 0; border-top: 1px solid var(--line-dark); }
.proof-strip div { min-height: 94px; display: flex; flex-direction: column; justify-content: center; padding: 15px 26px; border-right: 1px solid var(--line-dark); }
.proof-strip div:first-child { border-left: 1px solid var(--line-dark); }
.proof-strip strong { font-size: 1.28rem; line-height: 1.2; }
.proof-strip span { margin-top: 5px; color: rgba(255,255,255,.48); font-size: .79rem; }

.section-heading { max-width: 900px; margin-bottom: 60px; }
.section-heading p { max-width: 610px; color: var(--muted); font-size: 1.08rem; }
.split-heading { max-width: none; display: grid; grid-template-columns: 1.45fr .65fr; align-items: end; gap: 70px; }
.split-heading h2 { margin-bottom: 0; }
.split-heading > p { margin-bottom: 8px; }
.use-cases { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.use-card { position: relative; min-height: 360px; padding: 30px 26px 26px; border-right: 1px solid var(--line); transition: color .3s ease, background .3s ease; }
.use-card:first-child { border-left: 1px solid var(--line); }
.use-card:hover { color: #fff; background: var(--ink); }
.case-number { display: block; color: var(--muted); font-size: .72rem; letter-spacing: .12em; }
.case-icon { margin: 50px 0 28px; color: var(--red); font-family: Georgia, serif; font-size: 2.2rem; }
.use-card h3 { margin-bottom: 15px; }
.use-card p { color: var(--muted); font-size: .93rem; }
.use-card:hover p, .use-card:hover .case-number { color: rgba(255,255,255,.6); }
.case-tag { position: absolute; bottom: 25px; left: 26px; color: var(--muted); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }
.use-card:hover .case-tag { color: var(--jade); }

.practice-section { color: #fff; background: var(--red); }
.practice-grid { display: grid; grid-template-columns: .85fr 1.15fr; align-items: start; gap: clamp(50px, 9vw, 130px); }
.kicker-light { color: rgba(255,255,255,.58); }
.practice-copy h2 { max-width: 540px; }
.practice-copy h2 em { color: #fff; }
.practice-copy > p { max-width: 525px; color: rgba(255,255,255,.7); font-size: 1.04rem; }
.method-list { margin-top: 48px; border-top: 1px solid rgba(255,255,255,.24); }
.method-list > div { display: grid; grid-template-columns: 38px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.24); }
.method-list span { font-family: Georgia, serif; font-size: .85rem; opacity: .7; }
.method-list p { margin: 0; color: rgba(255,255,255,.72); font-size: .91rem; }
.method-list b { color: #fff; }
.scenario-panel { min-height: 575px; background: var(--paper-bright); color: var(--ink); box-shadow: 20px 20px 0 rgba(0,0,0,.1); }
.scenario-top { display: flex; align-items: center; justify-content: space-between; gap: 22px; padding: 22px 26px; border-bottom: 1px solid var(--line); }
.scenario-top > span { color: var(--muted); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; }
.tabs { display: flex; gap: 4px; }
.tabs button { padding: 8px 12px; border: 0; background: transparent; color: var(--muted); font-size: .75rem; cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--ink); color: #fff; }
.scenario-content { padding: clamp(32px, 5vw, 62px); }
.scenario-label { margin-bottom: 28px; color: var(--red); font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.phrase { max-width: 680px; font-family: Georgia, "Songti SC", serif; font-size: clamp(2.4rem, 5vw, 4.8rem); line-height: 1.16; }
.pinyin { margin-top: 14px; color: var(--muted); font-size: .95rem; letter-spacing: .04em; }
.translation { margin-top: 32px; font-family: Georgia, serif; font-size: clamp(1.25rem, 2vw, 1.65rem); line-height: 1.35; }
.context-note { display: grid; grid-template-columns: 70px 1fr; gap: 22px; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); }
.context-note span { color: var(--red); font-size: .72rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.context-note p { margin: 0; color: var(--muted); font-size: .9rem; }

.roadmap-section { background: var(--paper-bright); }
.roadmap { display: grid; grid-template-columns: repeat(4, 1fr); counter-reset: stage; }
.roadmap article { position: relative; min-height: 270px; padding: 31px 28px 34px; border: 1px solid var(--line); border-right: 0; }
.roadmap article:last-child { border-right: 1px solid var(--line); }
.roadmap article::before { counter-increment: stage; content: "0" counter(stage); display: block; margin-bottom: 50px; color: var(--red); font-family: Georgia, serif; font-size: 1rem; }
.roadmap article::after { content: ""; position: absolute; left: 0; top: -1px; width: 0; height: 3px; background: var(--red); transition: width .35s ease; }
.roadmap article:hover::after { width: 100%; }
.roadmap .week { position: absolute; right: 25px; top: 31px; color: var(--muted); font-size: .72rem; }
.roadmap h3 { margin-bottom: 13px; font-size: 1.25rem; }
.roadmap p { margin-bottom: 0; color: var(--muted); font-size: .88rem; }

.formats-section { background: var(--paper); }
.format-grid { display: grid; grid-template-columns: repeat(3, 1fr); align-items: stretch; }
.format-card { display: flex; flex-direction: column; min-height: 570px; padding: 34px 30px; border: 1px solid var(--line); border-right: 0; background: var(--paper-bright); }
.format-card:last-child { border-right: 1px solid var(--line); }
.format-card.featured { position: relative; z-index: 1; margin: -18px 0; padding-top: 52px; color: #fff; background: var(--red); border-color: var(--red); box-shadow: 0 24px 60px rgba(108,20,15,.18); }
.format-card.corporate { color: #fff; background: var(--ink); }
.format-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 54px; }
.format-label { font-size: .72rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.format-index { font-family: Georgia, serif; color: var(--muted); }
.featured .format-index, .corporate .format-index { color: rgba(255,255,255,.45); }
.format-card h3 { margin-bottom: 18px; font-size: clamp(1.7rem, 2.5vw, 2.3rem); }
.format-card > p { min-height: 105px; color: var(--muted); font-size: .94rem; }
.featured > p, .corporate > p { color: rgba(255,255,255,.68); }
.format-card ul { margin: 18px 0 34px; padding: 19px 0 0; border-top: 1px solid var(--line); list-style: none; }
.featured ul, .corporate ul { border-color: rgba(255,255,255,.24); }
.format-card li { padding: 6px 0 6px 20px; position: relative; font-size: .88rem; }
.format-card li::before { content: ""; position: absolute; left: 0; top: 13px; width: 6px; height: 6px; background: var(--red); }
.featured li::before { background: #fff; }
.corporate li::before { background: var(--jade); }
.price { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px; margin-top: auto; margin-bottom: 25px; }
.price strong { font-size: 1.9rem; letter-spacing: -.04em; }
.price span { color: var(--muted); font-size: .76rem; }
.featured .price span, .corporate .price span { color: rgba(255,255,255,.55); }

.about-section { color: #fff; background: var(--ink); overflow: hidden; }
.about-grid { display: grid; grid-template-columns: .9fr 1.05fr; gap: clamp(60px, 9vw, 140px); align-items: center; }
.about-media { position: relative; min-height: 760px; }
.about-main-photo { position: absolute; inset: 0 20% 80px 0; margin: 0; overflow: hidden; }
.about-main-photo img { height: 100%; object-fit: cover; object-position: center 35%; filter: saturate(.75); }
.about-small-photo { position: absolute; right: 0; bottom: 0; width: 55%; margin: 0; border: 10px solid var(--ink); }
.about-small-photo img { aspect-ratio: 1.05; object-fit: cover; }
.about-caption { position: absolute; left: -30px; bottom: 36px; padding: 20px 24px; background: var(--red); font-family: Georgia, serif; font-size: 1rem; line-height: 1.35; box-shadow: var(--shadow); }
.about-caption b { color: #fff; font-weight: 400; }
.about-copy h2 em { color: var(--red); }
.about-lead { max-width: 670px; color: rgba(255,255,255,.65); font-size: 1.06rem; }
.credentials { margin-top: 48px; border-top: 1px solid var(--line-dark); }
.credentials article { display: grid; grid-template-columns: 48px 1fr; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line-dark); }
.credentials article > span { color: var(--red); font-family: Georgia, serif; font-size: .8rem; }
.credentials h3 { margin: 0 0 8px; font-size: 1.06rem; letter-spacing: -.02em; }
.credentials p { margin: 0; color: rgba(255,255,255,.5); font-size: .86rem; }

.reviews-section { background: var(--paper-bright); }
.reviews-head { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 60px; margin-bottom: 60px; }
.reviews-head h2 { margin-bottom: 0; }
.rating-badge { display: grid; min-width: 170px; padding: 22px; border: 1px solid var(--line); background: #fff; }
.rating-badge strong { font-size: 2.2rem; line-height: 1; }
.stars { margin: 8px 0 5px; color: #f6a500; letter-spacing: .08em; }
.rating-badge small { color: var(--muted); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.review-card { display: flex; flex-direction: column; min-height: 385px; padding: 28px 30px; border: 1px solid var(--line); border-right: 0; background: var(--paper); }
.review-card:last-child { border-right: 1px solid var(--line); }
.review-card-dark { color: #fff; background: var(--ink); }
.review-mark { height: 75px; color: var(--red); font-family: Georgia, serif; font-size: 5rem; line-height: 1; }
.review-card > p { font-family: Georgia, serif; font-size: 1.18rem; line-height: 1.55; }
.review-card footer { margin-top: auto; padding-top: 25px; border-top: 1px solid var(--line); }
.review-card-dark footer { border-color: var(--line-dark); }
.review-card footer b, .review-card footer span { display: block; }
.review-card footer b { font-size: .9rem; }
.review-card footer span { margin-top: 3px; color: var(--muted); font-size: .75rem; }
.review-card-dark footer span { color: rgba(255,255,255,.45); }

.hsk-section { color: #fff; background: var(--red); padding-bottom: 0; overflow: hidden; }
.hsk-grid { display: grid; grid-template-columns: .8fr 1fr; gap: clamp(50px, 9vw, 130px); align-items: end; }
.hsk-copy { padding-bottom: 110px; }
.hsk-copy h2 { max-width: 550px; }
.hsk-copy p { max-width: 530px; color: rgba(255,255,255,.72); }
.hsk-copy ul { margin: 32px 0; padding: 0; list-style: none; }
.hsk-copy li { padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,.24); }
.hsk-photo { position: relative; margin: 0; height: 650px; overflow: hidden; }
.hsk-photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.72), transparent 46%); }
.hsk-photo img { height: 100%; object-fit: cover; }
.hsk-photo figcaption { position: absolute; left: 30px; bottom: 28px; z-index: 1; }
.hsk-photo b, .hsk-photo span { display: block; }
.hsk-photo b { font-family: Georgia, serif; font-size: 2rem; }
.hsk-photo span { color: rgba(255,255,255,.6); font-size: .75rem; }

.faq-section { background: var(--paper-bright); }
.faq-grid { display: grid; grid-template-columns: .65fr 1.15fr; gap: clamp(50px, 10vw, 150px); }
.faq-title { position: sticky; top: 120px; align-self: start; }
.faq-title h2 { font-size: clamp(2.6rem, 4vw, 4rem); }
.faq-title p { max-width: 400px; color: var(--muted); }
.accordion { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 26px 0; cursor: pointer; list-style: none; font-size: 1.08rem; font-weight: 650; }
summary::-webkit-details-marker { display: none; }
summary span { position: relative; width: 18px; height: 18px; flex: 0 0 18px; }
summary span::before, summary span::after { content: ""; position: absolute; background: var(--red); transition: transform .2s ease; }
summary span::before { left: 0; top: 8px; width: 18px; height: 2px; }
summary span::after { left: 8px; top: 0; width: 2px; height: 18px; }
details[open] summary span::after { transform: rotate(90deg); }
details p { max-width: 700px; padding: 0 45px 25px 0; color: var(--muted); }

.final-cta { padding: 110px 0; color: #fff; background: var(--ink); border-top: 1px solid var(--line-dark); }
.final-photo { position: relative; height: clamp(280px, 34vw, 420px); margin-bottom: 78px; overflow: hidden; }
.final-photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.72), transparent 56%); }
.final-photo img { height: 100%; object-fit: cover; object-position: center 43%; filter: saturate(.88) contrast(1.02); }
.final-photo figcaption { position: absolute; left: 30px; bottom: 26px; z-index: 1; }
.final-photo figcaption span, .final-photo figcaption b { display: block; }
.final-photo figcaption span { color: rgba(255,255,255,.58); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; }
.final-photo figcaption b { margin-top: 4px; font-family: Georgia, serif; font-size: 1.45rem; font-weight: 400; }
.final-cta-grid { display: grid; grid-template-columns: 1.15fr .65fr; gap: clamp(60px, 10vw, 150px); align-items: end; }
.final-cta h2 { max-width: 800px; margin-bottom: 0; font-size: clamp(2.9rem, 5vw, 5.35rem); }
.final-action p { color: rgba(255,255,255,.62); }
.final-action small { display: block; margin-top: 12px; color: rgba(255,255,255,.38); }
.site-footer { padding: 36px 0; color: #fff; background: var(--ink); border-top: 1px solid var(--line-dark); }
.footer-grid { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 50px; }
.footer-meta { display: flex; gap: 28px; color: rgba(255,255,255,.48); font-size: .75rem; }
.footer-link { border-bottom: 1px solid rgba(255,255,255,.35); font-size: .84rem; }
.mobile-cta { display: none; }

.reveal { opacity: 1; transform: none; }
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.8,.2,1); }
.js .reveal.is-visible { opacity: 1; transform: none; }
.reveal-delay { transition-delay: .1s; }
.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }

@media (max-width: 1060px) {
  .desktop-nav { display: none; }
  .hero-grid { grid-template-columns: 1fr .78fr; gap: 45px; }
  .hero-visual { min-height: 580px; }
  .hero-card-top { right: -10px; }
  .proof-strip { grid-template-columns: repeat(2, 1fr); }
  .proof-strip div:nth-child(3) { border-left: 1px solid var(--line-dark); }
  .proof-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--line-dark); }
  .use-cases { grid-template-columns: repeat(2, 1fr); }
  .use-card:nth-child(2) { border-right: 1px solid var(--line); }
  .use-card:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .practice-grid, .about-grid { gap: 60px; }
  .roadmap { grid-template-columns: repeat(2, 1fr); }
  .roadmap article:nth-child(2) { border-right: 1px solid var(--line); }
  .roadmap article:nth-child(-n+2) { border-bottom: 0; }
  .format-grid { grid-template-columns: 1fr; gap: 16px; }
  .format-card, .format-card:last-child { min-height: auto; border: 1px solid var(--line); }
  .format-card.featured { margin: 0; padding-top: 34px; }
  .format-card > p { min-height: auto; }
  .format-card ul { columns: 3; }
  .about-media { min-height: 660px; }
}

@media (min-width: 781px) and (max-height: 820px) {
  .hero { padding-top: 102px; }
  .hero-copy { padding-bottom: 14px; }
  .hero .eyebrow { margin-bottom: 14px; }
  .hero h1 { max-width: 740px; margin-bottom: 17px; font-size: clamp(3.2rem, 5.6vw, 4.75rem); }
  .hero-lead { margin-bottom: 19px; font-size: 1rem; line-height: 1.42; }
  .hero-actions .button { min-height: 52px; }
  .hero-notes { margin-top: 16px; }
  .hero-visual { min-height: 490px; }
  .hero-card-top { top: 26px; }
  .hero-card-bottom { bottom: 21px; }
  .proof-strip div { min-height: 78px; padding-block: 10px; }
  .proof-strip strong { font-size: 1.12rem; }
}

@media (max-width: 780px) {
  html { scroll-padding-top: 72px; }
  body { padding-bottom: 68px; }
  .container { width: min(calc(100% - 30px), var(--container)); }
  .section { padding: 82px 0; }
  .site-header { position: absolute; }
  .site-header.is-sticky { position: fixed; }
  .nav-wrap { height: 70px; }
  .site-header .button-small { display: none; }
  .brand-mark { width: 34px; height: 34px; }
  .brand b { font-size: .87rem; }
  .hero { min-height: auto; padding-top: 110px; }
  .hero-grid { grid-template-columns: 1fr; gap: 35px; }
  .hero-copy { padding-bottom: 0; }
  .hero h1 { font-size: clamp(3.1rem, 15vw, 5.6rem); }
  .hero-lead { font-size: 1rem; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 12px; }
  .hero-actions .button { width: 100%; }
  .hero-actions .text-link { width: max-content; }
  .hero-notes { display: grid; gap: 8px; margin-top: 25px; }
  .hero-visual { min-height: 500px; margin-top: 6px; }
  .hero-photo { inset: 0 0 0 18px; }
  .hero-card-top { top: 18px; right: -3px; }
  .hero-card-bottom { left: 0; bottom: 18px; }
  .hanzi-rail { left: -4px; }
  .proof-strip { margin-top: 40px; }
  .proof-strip div { min-height: 98px; padding: 15px; }
  .proof-strip strong { font-size: 1.08rem; }
  .split-heading, .practice-grid, .about-grid, .hsk-grid, .faq-grid, .final-cta-grid { grid-template-columns: 1fr; gap: 40px; }
  .split-heading { align-items: start; }
  .section-heading { margin-bottom: 42px; }
  h2 { font-size: clamp(2.6rem, 12vw, 4.2rem); }
  .use-card { min-height: 315px; }
  .practice-section { padding-bottom: 95px; }
  .scenario-panel { min-height: auto; box-shadow: 10px 10px 0 rgba(0,0,0,.1); }
  .scenario-top { align-items: flex-start; flex-direction: column; }
  .tabs { width: 100%; overflow-x: auto; }
  .tabs button { flex: 1 0 auto; }
  .scenario-content { padding: 34px 24px; }
  .context-note { grid-template-columns: 1fr; gap: 9px; }
  .roadmap article { min-height: 235px; }
  .format-card ul { columns: 1; }
  .format-card { padding: 28px 24px; }
  .format-head { margin-bottom: 40px; }
  .about-media { display: grid; min-height: 0; }
  .about-main-photo { position: relative; inset: auto; width: 100%; aspect-ratio: 1 / 1; margin: 0; }
  .about-main-photo img { height: 100%; object-position: center 60%; }
  .about-small-photo { display: none; }
  .about-caption { position: static; width: 100%; padding: 18px 20px 19px; box-shadow: none; font-family: inherit; font-size: .94rem; line-height: 1.42; }
  .about-caption b { font-weight: 650; }
  .about-copy { padding-top: 10px; }
  .reviews-head { grid-template-columns: 1fr; align-items: start; gap: 30px; }
  .rating-badge { width: 100%; }
  .review-grid { grid-template-columns: 1fr; gap: 12px; }
  .review-card, .review-card:last-child { min-height: 330px; border: 1px solid var(--line); }
  .hsk-section { padding-bottom: 0; }
  .hsk-copy { padding-bottom: 10px; }
  .hsk-photo { height: 480px; }
  .faq-title { position: static; }
  .final-cta { padding: 80px 0; }
  .final-photo { height: 245px; margin-bottom: 48px; }
  .final-photo figcaption { left: 20px; bottom: 18px; }
  .footer-grid { grid-template-columns: 1fr auto; gap: 28px; }
  .footer-meta { grid-column: 1 / -1; grid-row: 2; flex-direction: column; gap: 5px; }
  .mobile-cta { position: fixed; left: 12px; right: 12px; bottom: 10px; z-index: 100; display: flex; align-items: center; justify-content: space-between; min-height: 50px; padding: 0 18px; color: #fff; background: var(--red); box-shadow: 0 12px 38px rgba(0,0,0,.3); font-weight: 750; font-size: .92rem; }
}

@media (max-width: 520px) {
  .proof-strip { grid-template-columns: 1fr 1fr; }
  .proof-strip span { font-size: .7rem; }
  .use-cases { grid-template-columns: 1fr; }
  .use-card, .use-card:first-child, .use-card:nth-child(2) { border: 1px solid var(--line); border-bottom: 0; }
  .use-card:last-child { border-bottom: 1px solid var(--line); }
  .roadmap { grid-template-columns: 1fr; }
  .roadmap article, .roadmap article:nth-child(2), .roadmap article:last-child { border: 1px solid var(--line); border-bottom: 0; }
  .roadmap article:last-child { border-bottom: 1px solid var(--line); }
  .credentials article { grid-template-columns: 34px 1fr; }
  .footer-link { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}