:root {
  --blue: #1a8cf7;
  --button-blue: #3397f4;
  --ink: #17243d;
  --muted: #56637b;
  --surface: #f6f6fd;
  --surface-blue: #f1f5fc;
  --container: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 124px; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "Nunito", sans-serif; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; }
:where(a, button, summary):focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
img { display: block; max-width: 100%; }
p, h1, h2, h3 { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
.container { position: relative; width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
.desktop-only { display: block; }

.button { display: inline-flex; align-items: center; justify-content: center; border-radius: 56px; background: var(--button-blue); color: #fff; font-weight: 700; transition: transform .25s ease, background-color .25s ease, box-shadow .25s ease; }
.button:hover { background: var(--blue); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(26, 140, 247, .2); }
.button:active { transform: translateY(0) scale(.98); }
.button--small { width: 170px; height: 44px; font-size: 16px; }

.site-header { position: sticky; z-index: 50; top: 0; height: 100px; background: #fff; }
.nav-wrap { height: 100px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 13.5px; flex: none; }
.brand img { width: 48.45px; height: 44px; }
.brand span { color: #000; font-size: 27.08px; font-weight: 700; }
.desktop-nav { display: flex; align-items: center; gap: 60px; margin-left: 58px; }
.desktop-nav a, .footer-nav a { position: relative; font-size: 16px; font-weight: 700; line-height: 25px; white-space: nowrap; }
.desktop-nav a::after, .footer-nav a::after { position: absolute; right: 0; bottom: -5px; left: 0; height: 2px; border-radius: 2px; background: var(--blue); content: ""; transform: scaleX(0); transition: transform .25s ease; }
.desktop-nav a:hover::after, .footer-nav a:hover::after { transform: scaleX(1); }
.nav-dropdown { position: relative; }
.nav-dropdown-toggle { display: inline-flex; gap: 7px; align-items: center; padding: 0; border: 0; background: none; color: inherit; font-size: 16px; font-weight: 700; line-height: 25px; white-space: nowrap; cursor: pointer; }
.nav-dropdown-toggle svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; transition: transform .25s ease; }
.nav-dropdown-menu { position: absolute; top: calc(100% + 16px); left: 50%; display: flex; flex-direction: column; gap: 2px; min-width: 208px; padding: 12px; border-radius: 18px; background: #fff; box-shadow: 0 18px 44px rgba(23, 36, 61, .14); opacity: 0; visibility: hidden; pointer-events: none; transform: translateX(-50%) translateY(8px); transition: opacity .22s ease, transform .22s ease, visibility .22s ease; }
.nav-dropdown-menu::before { position: absolute; top: -24px; right: 0; left: 0; height: 24px; content: ""; }
.nav-dropdown-menu a { padding: 12px 14px; border-radius: 12px; color: var(--ink); font-size: 15px; font-weight: 600; line-height: 20px; transition: background-color .2s ease, color .2s ease; }
.nav-dropdown-menu a::after { display: none; }
.nav-dropdown-menu a:hover { background: var(--surface); color: var(--blue); }
.nav-dropdown:hover .nav-dropdown-menu, .nav-dropdown:focus-within .nav-dropdown-menu, .nav-dropdown.is-open .nav-dropdown-menu { opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0); }
.nav-dropdown:hover .nav-dropdown-toggle svg, .nav-dropdown:focus-within .nav-dropdown-toggle svg, .nav-dropdown.is-open .nav-dropdown-toggle svg { transform: rotate(180deg); }
.menu-toggle, .mobile-nav { display: none; }

.hero { position: relative; height: 800px; overflow: hidden; background: #fff; }
.hero-texture { position: absolute; inset: -80px 0 0; background: url("../img/hero-bg-texture.webp") center / cover no-repeat; opacity: .15; }
.hero-layout { height: 100%; display: flex; }
.hero-content { flex: 1 1 auto; min-width: 0; z-index: 1; padding-top: 178px; }
.hero-eyebrow { color: #14233f; font-size: 40px; font-weight: 800; line-height: normal; white-space: nowrap; }
.hero h1 { margin-top: 33px; color: var(--blue); font-size: 72px; font-weight: 800; line-height: normal; }
.hero-description { width: 649px; max-width: 100%; margin-top: 63px; color: rgba(0, 0, 0, .6); font-size: 20px; line-height: 32px; }
.app-store { display: inline-flex; align-items: center; gap: 28px; min-width: 252px; margin-top: 61px; padding: 18px 32px 18px 28px; border-radius: 20px; background: #0b0b0b; color: #fff; transition: transform .25s ease, box-shadow .25s ease; }
.app-store:hover { transform: translateY(-3px); box-shadow: 0 14px 30px rgba(0, 0, 0, .18); }
.app-store img { width: 48px; height: 48px; }
.app-store span { display: flex; flex-direction: column; }
.app-store small { font-size: 16px; line-height: 25px; }
.app-store strong { font-size: 26px; line-height: 25px; }
.hero-visual { flex: none; margin-top: 127px; z-index: 1; width: 580px; height: 673px; overflow: hidden; }
.hero-banner { display: block; width: 100%; height: 100%; object-fit: cover; }
.section-heading { position: absolute; top: 100px; right: 0; left: 0; margin-inline: auto; text-align: center; }
.section-heading h2 { color: var(--ink); font-size: 60px; font-weight: 800; line-height: 82px; }
.section-heading h2 span { color: var(--blue); }
.section-heading p { margin-top: 12px; color: var(--muted); font-size: 20px; line-height: 32px; }
.tutor-section { position: relative; height: 1000px; background: #fff; }
.tutor-stage { height: 100%; }
.tutor-card { position: absolute; top: 400px; left: 0; width: 100%; height: 500px; border-radius: 40px; background: var(--surface); }
.tutor-phone-wrap { position: absolute; left: 40px; top: 315px; width: 522px; height: 585px; overflow: hidden; }
.tutor-phone-shot { position: absolute; inset: 0; width: 522px; height: 585px; opacity: 0; transition: opacity .5s ease; }
.tutor-phone-shot.is-front { opacity: 1; }
.tutor-step { position: absolute; left: 545px; top: 460px; width: 560px; }
.step-count { display: flex; align-items: baseline; height: 65px; color: var(--button-blue); }
.step-count strong { font-size: 48px; line-height: normal; }
.step-count span { margin-left: 8px; font-size: 24px; line-height: 24px; }
.tutor-step h3 { margin-top: 25px; font-size: 44px; line-height: normal; white-space: nowrap; }
.tutor-step p { margin-top: 24px; color: var(--muted); font-size: 32px; line-height: 48px; }
.tutor-step.is-entering .step-count, .tutor-step.is-entering h3, .tutor-step.is-entering p { animation: tutor-text-in .45s ease; }
.tutor-dots { position: absolute; left: 1153px; top: 650px; display: flex; flex-direction: column; gap: 14px; align-items: center; transform: translateY(-50%); }
.tutor-dots button { width: 8px; height: 8px; padding: 0; border: 0; border-radius: 8px; background: rgba(23, 36, 61, .18); cursor: pointer; transition: background-color .25s ease, height .25s ease; }
.tutor-dots button.is-active { height: 24px; background: var(--button-blue); }

.situations-section { position: relative; height: 1100px; background: var(--surface); }
.situations-section .section-heading h2 { line-height: 58px; }
.situations-section .section-heading p { margin-top: 28px; }
.scene-tabs { position: absolute; top: 300px; left: 50%; display: flex; gap: 40px; align-items: center; transform: translateX(-50%); }
.scene-tab { display: flex; gap: 12px; align-items: center; justify-content: center; height: 61px; padding: 0 20px; border: 0; border-radius: 60px; background: #fff; font-size: 20px; white-space: nowrap; cursor: pointer; transition: color .25s ease, background-color .25s ease, transform .25s ease, box-shadow .25s ease; }
.scene-tab-icon { flex: none; font-size: 26px; line-height: 1; }
.scene-tab:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(23, 36, 61, .08); }
.scene-tab.is-active { background: var(--blue); color: #fff; font-weight: 700; }
.conversation-card { position: absolute; top: 400px; left: 0; right: 0; height: 600px; margin-inline: auto; border-radius: 40px; background: #fff; }
.conversation-visual { position: absolute; left: 0; top: 0; width: 570px; height: 600px; padding: 48px; box-sizing: border-box; }
.conversation-scene { display: block; width: 100%; height: 100%; object-fit: contain; }
.conversation-chat { position: absolute; left: 570px; top: 40px; display: flex; flex-direction: column; gap: 28px; width: 550px; height: 520px; padding: 40px; border-radius: 28px; background: var(--surface-blue); }
.chat-bubble { align-self: flex-start; padding: 16px 28px; border-radius: 12px 28px 20px 28px; background: #fffaec; color: #000; font-size: 18px; font-weight: 400; line-height: normal; transition: opacity .2s ease, transform .2s ease; }
.chat-bubble--intro { min-height: 107px; }
.chat-bubble--user { align-self: flex-end; padding-block: 12px; border-radius: 28px 12px 28px 28px; background: #d1e9ff; }
.conversation-chat.is-entering .chat-bubble { animation: bubble-in .3s ease both; }
.conversation-chat.is-entering .chat-bubble:nth-child(2) { animation-delay: .05s; }
.conversation-chat.is-entering .chat-bubble:nth-child(3) { animation-delay: .1s; }
.conversation-chat.is-entering .chat-bubble:nth-child(4) { animation-delay: .15s; }
.conversation-chat.is-entering .chat-bubble:nth-child(5) { animation-delay: .2s; }
.conversation-scene { transition: opacity .2s ease; }
.conversation-scene.is-entering { animation: bubble-in .3s ease both; }

.videos-section { position: relative; height: 1100px; overflow: hidden; background: linear-gradient(180deg, #14233f, #271b5f); }
.video-texture { position: absolute; inset: 0; overflow: hidden; opacity: .2; }
.video-texture::before { content: ""; position: absolute; inset: -50%; background: url("../img/video-texture.webp") center / cover; transform: rotate(90deg); }
.section-heading--light h2 { color: #ffc664; }
.section-heading--light h2 .white { color: #fff; }
.section-heading--light p { margin-top: 40px; color: rgba(255, 255, 255, .6); }
.video-gallery { position: absolute; top: 327px; left: 0; width: 100%; height: 600px; }
.video-viewport { height: 600px; overflow: hidden; perspective: 1400px; -webkit-mask-image: linear-gradient(90deg, transparent, #000 140px, #000 calc(100% - 140px), transparent); mask-image: linear-gradient(90deg, transparent, #000 140px, #000 calc(100% - 140px), transparent); }
.video-track { position: relative; display: flex; gap: 24px; align-items: center; width: max-content; height: 600px; will-change: transform; transform-style: preserve-3d; pointer-events: none; }
.video-nav { position: absolute; z-index: 3; top: 50%; display: grid; place-items: center; width: 56px; height: 56px; padding: 0; border: 0; border-radius: 50%; background: #fff; color: #14233f; cursor: pointer; transform: translateY(-50%); transition: transform .2s ease, background-color .2s ease; }
.video-nav:hover { transform: translateY(-50%) scale(1.06); }
.video-nav svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.video-nav--prev { left: 48px; }
.video-nav--next { right: 48px; }
.video-card { position: relative; flex: none; width: 220px; aspect-ratio: 9 / 16; overflow: hidden; border-radius: 16px; will-change: transform; pointer-events: auto; cursor: pointer; }
.video-card > img, .video-card > video { width: 100%; max-width: none; height: 100%; object-fit: cover; transform: scale(1.08); transition: filter .3s ease, transform .3s ease; }
.video-card:hover > img, .video-card:hover > video { filter: brightness(1.08); transform: scale(1.14); }
.watch-more { position: absolute; top: 942px; left: 50%; display: flex; align-items: center; justify-content: center; height: 78px; padding: 8px 40px; border: 2px solid rgba(255, 255, 255, .1); border-radius: 60px; background: rgba(222, 209, 255, .2); color: #fff; font-size: 24px; font-weight: 700; line-height: 58px; white-space: nowrap; transform: translateX(-50%); transition: background-color .25s ease, gap .25s ease; }
.watch-more span { margin-left: 5px; transition: transform .25s ease; }
.watch-more:hover { background: rgba(222, 209, 255, .32); }
.watch-more:hover span { transform: translateX(5px); }

.learning-section { position: relative; z-index: 2; height: 900px; background: var(--surface); }
.learning-section .section-heading p { margin-top: 28px; }
.learning-visual { position: absolute; top: 294px; left: 50%; width: 760px; height: 606px; transform: translateX(-50%); }
.learning-video { display: block; width: 100%; height: 100%; object-fit: cover; }

.reviews-section { position: relative; height: 1150px; overflow: hidden; background: #fff; }
.reviews-heading { position: absolute; top: 100px; right: 0; left: 0; text-align: center; }
.reviews-heading h2, .comparison-section .section-heading h2, .faq-section .section-heading h2 { font-size: 48px; font-weight: 700; line-height: 58px; }
.review-stats { position: absolute; top: 238px; right: 0; left: 0; display: flex; justify-content: center; }
.review-stats img { width: 594px; height: auto; }
.stars { display: flex; gap: 4px; align-items: center; }
.stars i { display: block; flex: none; width: 18px; height: 18px; background: url("../img/star.webp") center / 18px 18px no-repeat; }
.reviews-viewport { position: absolute; top: 390px; left: 50%; width: 1400px; height: 640px; overflow: hidden; transform: translateX(-50%); }
.reviews-viewport::before, .reviews-viewport::after { position: absolute; z-index: 4; top: 0; bottom: 0; width: 200px; content: ""; pointer-events: none; }
.reviews-viewport::before { left: 0; background: linear-gradient(90deg, #fff, rgba(255, 255, 255, 0)); }
.reviews-viewport::after { right: 0; background: linear-gradient(-90deg, #fff, rgba(255, 255, 255, 0)); }
.reviews-row { display: flex; gap: 40px; align-items: flex-start; width: max-content; }
.reviews-row--one { animation: review-marquee-left 32s linear infinite; }
.reviews-row--two { margin-top: 40px; animation: review-marquee-right 38s linear infinite; }
.review-card { display: flex; flex: none; flex-direction: column; gap: 12px; width: 572px; height: 300px; padding: 28px; overflow: hidden; border: 1px solid #fff; border-radius: 24px; background: var(--surface); }
.review-card--wide { width: 600px; }
.review-card--medium { width: 572px; }
.review-card--small { width: 563px; }
.review-card--large { width: 646px; }
.review-card header { display: flex; justify-content: space-between; color: var(--muted); font-size: 15px; line-height: 22px; white-space: nowrap; }
.review-card header span { font-weight: 600; }
.review-card h3 { font-size: 20px; line-height: 28px; }
.review-card p { color: var(--muted); font-size: 16px; line-height: 26px; }

.comparison-section { position: relative; height: 1100px; background: var(--surface-blue); }
.comparison-grid { position: absolute; top: 296px; right: 0; left: 0; height: 680px; margin-inline: auto; }
.private-card { position: absolute; left: 109px; top: 35px; width: 420px; height: 591px; }
.private-card-bg { position: absolute; inset: 0; width: 420px; height: 591px; }
.comparison-label { position: absolute; top: 36px; left: 50%; padding: 7px 18px; border: 1px solid rgba(0, 0, 0, .16); border-radius: 54px; color: #5b6472; font-size: 18px; white-space: nowrap; transform: translateX(-50%); }
.private-price { position: absolute; top: 101px; left: 0; width: 100%; color: #626c7d; font-size: 60px; font-weight: 700; text-align: center; }
.private-price small { font-size: 20px; font-weight: 500; }
.private-card ul { position: absolute; top: 225px; left: 44px; display: flex; flex-direction: column; gap: 30px; }
.private-card li { display: flex; gap: 14px; align-items: center; color: #5f6878; font-size: 20px; font-weight: 500; line-height: 24px; white-space: nowrap; }
.lingo-card { position: absolute; left: 528px; top: 0; width: 600px; height: 680px; border-radius: 40px; background: linear-gradient(0deg, #0d84f4, #4ca8ff); color: #fff; }
.lingo-card .comparison-label { top: 29px; border: 2px solid rgba(255, 255, 255, .1); background: rgba(255, 255, 255, .09); color: #fff; font-weight: 700; }
.lingo-price { position: absolute; top: 103px; width: 100%; font-size: 80px; font-weight: 700; text-align: center; }
.lingo-price small { font-size: 24px; font-weight: 500; }
.lingo-card ul { position: absolute; top: 228px; left: 60px; display: flex; flex-direction: column; gap: 29px; }
.lingo-card li { display: flex; gap: 14px; align-items: center; font-size: 24px; font-weight: 600; line-height: 24px; white-space: nowrap; }
.lingo-cta { position: absolute; bottom: 54px; left: 96px; width: 408px; height: 80px; background: #fff; color: var(--blue); font-size: 21px; }
.lingo-cta:hover { background: #fff; box-shadow: 0 14px 30px rgba(0, 60, 130, .2); }

.faq-section { position: relative; padding-top: 218px; padding-bottom: 80px; background: #fff; }
.faq-grid { display: flex; gap: 56px; margin-inline: auto; }
.faq-column { width: 572px; flex: none; }
.faq-item { border-bottom: 1px solid #eaeaf0; }
.faq-item summary { position: relative; display: flex; gap: 20px; align-items: center; justify-content: space-between; min-height: 104px; padding: 24px 0; font-size: 18px; font-weight: 700; line-height: 26px; cursor: pointer; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary img { flex: none; width: 24px; height: 24px; transition: transform .25s ease; }
.faq-item[open] summary img { transform: rotate(180deg); }
.faq-item p { padding: 0 40px 6px 0; color: var(--muted); font-size: 16px; line-height: 26px; animation: faq-open .25s ease; }
.faq-item p:last-child { padding-bottom: 24px; }
.faq-item ol { margin: 6px 0 12px; padding-left: 0; list-style-position: inside; color: var(--muted); font-size: 16px; line-height: 26px; }
.faq-item ol li { margin-top: 8px; }
.faq-item p a { color: var(--blue); text-decoration: underline; }

.site-footer { background: var(--surface-blue); padding-bottom: 90px; }
.footer-stage { display: flex; flex-direction: column; }
.footer-top { display: flex; }
.footer-intro { display: flex; flex-direction: column; align-items: flex-start; flex: 1 1 auto; min-width: 0; width: 512px; }
.footer-brand { gap: 12px; margin-top: 94px; }
.footer-brand img { width: 54px; height: 54px; }
.footer-brand span { font-size: 24px; }
.footer-message { margin: 26px 0 0; }
.footer-message p { font-size: 44px; font-weight: 800; line-height: normal; }
.footer-message strong { color: var(--blue); font-size: 72px; font-weight: 800; line-height: normal; }
.footer-store { margin: 36px 0 0; }
.footer-art { position: relative; flex: none; margin-top: 52px; width: 688px; height: 408px; overflow: hidden; mask: url("../img/footer-mask.webp") center / 688px 408px no-repeat; }
.footer-art img { position: absolute; left: 5px; top: 70px; width: 671px; height: 366px; object-fit: cover; }
.footer-bottom { display: flex; flex-direction: column; align-items: center; height: 252px; margin-top: 80px; border-top: 1px solid rgba(26, 140, 247, .15); }
.footer-nav { display: flex; gap: 96px; margin-top: 51px; }
.social-links { display: flex; gap: 48px; margin-top: 36px; }
.social-links a { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; transition: transform .25s ease, background-color .25s ease; }
.social-links a:hover { background: rgba(26, 140, 247, .08); transform: translateY(-4px); }
.legal-links { display: flex; gap: 40px; margin-top: 40px; }
.legal-links a { font-size: 16px; opacity: .6; text-decoration: underline; white-space: nowrap; }

.reveal { opacity: 0; translate: 0 24px; transition: opacity .7s ease, translate .7s cubic-bezier(.2, .7, .2, 1); }
.reveal.is-visible { opacity: 1; translate: 0 0; }
.tutor-step.reveal { transition-delay: .12s; }

@keyframes mic-pulse { 0%, 100% { transform: scale(1); filter: drop-shadow(0 0 0 rgba(51, 151, 244, 0)); } 50% { transform: scale(1.035); filter: drop-shadow(0 0 12px rgba(51, 151, 244, .25)); } }
@keyframes review-marquee-left { from { transform: translateX(0); } to { transform: translateX(calc(-50% - 20px)); } }
@keyframes review-marquee-right { from { transform: translateX(calc(-50% - 20px)); } to { transform: translateX(0); } }
@keyframes faq-open { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }
@keyframes tutor-text-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes bubble-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (max-width: 1300px) {
  .desktop-nav { gap: 34px; margin-left: 0; }
  .hero-eyebrow { font-size: 34px; }
  .hero h1 { font-size: 64px; }
  .hero-description { width: 560px; }
  .hero-visual { width: 540px; height: 626px; }
  .footer-nav { gap: 60px; }
}

@media (max-width: 1250px) and (min-width: 901px) {
  .desktop-nav { gap: 24px; font-size: 14px; }
  .brand span { font-size: 23px; }
  .hero-visual { width: 450px; height: 522px; }
  .hero-eyebrow { font-size: 29px; }
  .hero h1 { font-size: 56px; }
  .hero-description { font-size: 18px; }
  .conversation-chat { left: 51%; width: 49%; padding: 34px 28px; }
  .chat-bubble { font-size: 16px; }
  .tutor-step { left: 55%; width: 42%; }
  .tutor-step h3 { font-size: clamp(28px, 3vw, 40px); }
  .tutor-dots { display: none; }
  .reviews-viewport { width: 100%; }
  .footer-art { left: 46%; width: 54%; mask-size: 100% 100%; }
  .footer-art img { left: 0; width: 100%; height: auto; }
  .footer-message { left: 0; }
  .faq-grid { gap: 32px; }
  .faq-column { flex: 1; width: auto; min-width: 0; }
  .comparison-grid { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 24px; }
  .private-card, .lingo-card { position: relative; left: auto; top: auto; width: 100%; }
  .private-card { margin-top: 35px; }
  .private-card-bg { width: 100%; height: 100%; }
  .private-card ul { right: 16px; left: 24px; }
  .private-card li { font-size: 16px; white-space: normal; }
  .lingo-card ul { right: 20px; left: 32px; }
  .lingo-card li { font-size: 20px; line-height: 26px; white-space: normal; }
  .lingo-cta { left: 8%; width: 84%; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 76px; }
  .container { width: calc(100% - 40px); }
  .desktop-only { display: none; }
  .site-header, .nav-wrap { height: 72px; }
  .site-header { position: sticky; top: 0; box-shadow: 0 1px rgba(23, 36, 61, .05); }
  .brand img { width: 39px; height: 36px; }
  .brand span { font-size: 23px; }
  .desktop-nav, .nav-cta { display: none; }
  .menu-toggle { display: flex; flex-direction: column; gap: 5px; align-items: center; justify-content: center; width: 44px; height: 44px; padding: 0; border: 0; border-radius: 50%; background: var(--surface); cursor: pointer; }
  .menu-toggle span { width: 20px; height: 2px; border-radius: 2px; background: var(--ink); transition: transform .25s ease, opacity .25s ease; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .mobile-nav { position: absolute; top: 72px; right: 0; left: 0; display: flex; flex-direction: column; gap: 4px; padding: 12px 20px 20px; border-top: 1px solid #eef1f6; background: #fff; box-shadow: 0 18px 30px rgba(23, 36, 61, .08); opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(-10px); transition: opacity .25s ease, transform .25s ease; }
  .mobile-nav.is-open { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0); }
  .mobile-nav a { padding: 12px 8px; font-size: 17px; font-weight: 700; }

  .hero { height: auto; min-height: 0; }
  .hero-layout { display: flex; flex-direction: column; align-items: center; }
  .hero-content { padding-top: 52px; text-align: center; }
  .hero-eyebrow { font-size: clamp(20px, 5.6vw, 25px); white-space: normal; }
  .hero h1 { margin-top: 18px; font-size: 52px; }
  .hero-description { width: 100%; max-width: 540px; margin-top: 24px; font-size: 17px; line-height: 28px; }
  .app-store { margin-top: 30px; }
  .hero-visual { flex: none; margin: 36px -130px -296px; transform: scale(.56); transform-origin: top center; }

  .section-heading { position: relative; top: auto; right: auto; left: auto; padding-top: 64px; }
  .section-heading h2 { font-size: 36px; line-height: 44px; }
  .section-heading p { margin-top: 16px; font-size: 16px; line-height: 26px; }
  .tutor-section, .situations-section, .videos-section, .learning-section, .reviews-section, .comparison-section, .faq-section { height: auto; }
  .tutor-stage { display: flex; flex-direction: column; align-items: center; height: auto; padding-bottom: 64px; touch-action: pan-y; }
  .tutor-card { top: 190px; bottom: 40px; width: 100%; height: auto; border-radius: 28px; }
  .tutor-phone-wrap { position: relative; left: auto; top: auto; width: min(324px, 100%); height: auto; aspect-ratio: 522 / 585; margin-top: 48px; overflow: visible; }
  .tutor-phone-shot { position: absolute; inset: 0; width: 100%; height: 100%; }
  .tutor-step { position: relative; left: auto; top: auto; width: 100%; margin-top: 24px; text-align: center; }
  .step-count { justify-content: center; }
  .tutor-step h3 { margin-top: 8px; font-size: clamp(22px, 6vw, 30px); white-space: normal; }
  .tutor-step p { max-width: 360px; min-height: 90px; margin: 14px auto 0; font-size: 20px; line-height: 30px; }
  .tutor-dots { position: relative; left: auto; top: auto; flex-direction: row; margin-top: 24px; transform: none; }
  .tutor-dots button.is-active { height: 8px; }

  .situations-section { padding-bottom: 64px; }
  .situations-section .section-heading h2 { line-height: 44px; }
  .situations-section .section-heading p { margin-top: 16px; }
  .scene-tabs { position: relative; top: auto; left: auto; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; width: min(100%, 560px); margin: 32px auto 24px; padding: 0 20px; transform: none; }
  .scene-tab { width: 100%; min-width: 0; height: 48px; padding: 0 12px; font-size: 16px; }
  .scene-tab-icon { font-size: 22px; }
  .conversation-card { position: relative; top: auto; display: flex; flex-direction: column; align-items: center; height: auto; padding: 24px 16px 16px; border-radius: 28px; }
  .conversation-visual { position: relative; flex: none; width: 521px; height: 550px; margin: 0 -87px -142px; transform: scale(.64); transform-origin: top center; }
  .conversation-chat { position: relative; left: auto; top: auto; gap: 16px; width: 100%; height: auto; padding: 20px 16px; }
  .chat-bubble { max-width: 95%; padding: 13px 18px; font-size: 15px; line-height: 21px; }
  .chat-bubble--intro { min-height: 0; }

  .videos-section { padding-bottom: 56px; }
  .section-heading--light p { margin-top: 16px; }
  .video-gallery { position: relative; top: auto; height: 400px; margin-top: 36px; }
  .video-viewport { height: 400px; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; -webkit-mask-image: none; mask-image: none; }
  .video-viewport::-webkit-scrollbar { display: none; }
  .video-track { position: relative; left: auto; gap: 16px; height: 400px; padding: 0 20px; transform: none; }
  .video-card { position: relative; top: auto; left: auto; flex: none; width: 180px; scroll-snap-align: center; }
  .video-card--clone { display: none; }
  .video-nav { display: none; }
  .watch-more { position: relative; top: auto; left: auto; height: 56px; margin: 28px auto 0; padding: 4px 24px; font-size: 18px; line-height: 44px; transform: none; }

  .learning-section { padding-bottom: 40px; overflow: hidden; }
  .learning-section .section-heading p { margin-top: 16px; }
  .learning-visual { position: relative; top: auto; left: auto; width: min(760px, 100% - 40px); height: auto; margin: 40px auto 0; transform: none; }
  .learning-video { height: auto; aspect-ratio: 760 / 606; }

  .reviews-section { padding-bottom: 52px; }
  .reviews-heading { position: relative; top: auto; padding-top: 64px; text-align: center; }
  .reviews-heading h2, .comparison-section .section-heading h2, .faq-section .section-heading h2 { font-size: 32px; line-height: 40px; }
  .review-stats { position: relative; top: auto; display: flex; justify-content: center; margin-top: 36px; padding: 0 12px; }
  .review-stats img { width: min(320px, 84vw); }
  .reviews-viewport { position: relative; top: auto; left: auto; width: 100%; height: auto; margin-top: 32px; overflow: visible; transform: none; }
  .reviews-viewport::before, .reviews-viewport::after { display: none; }
  .reviews-row { gap: 16px; width: auto; padding: 0 20px 12px; overflow-x: auto; scroll-snap-type: x mandatory; animation: none; scrollbar-width: none; }
  .reviews-row [aria-hidden="true"] { display: none; }
  .reviews-row::-webkit-scrollbar { display: none; }
  .reviews-row--two { margin-top: 12px; margin-left: 0; }
  .review-card, .review-card--wide, .review-card--medium, .review-card--small, .review-card--large { width: 84vw; height: auto; min-height: 330px; scroll-snap-align: center; }

  .comparison-section { padding-bottom: 64px; }
  .comparison-grid { position: relative; top: auto; display: flex; flex-direction: column; gap: 24px; align-items: center; height: auto; margin-top: 40px; }
  .private-card, .lingo-card { position: relative; left: auto; top: auto; width: 100%; max-width: 480px; }
  .private-card { height: 540px; }
  .private-card-bg { width: 100%; height: 100%; }
  .private-price { top: 100px; font-size: 52px; }
  .private-card ul { top: 210px; left: 28px; gap: 27px; }
  .private-card li { font-size: 17px; white-space: normal; }
  .lingo-card { height: 650px; }
  .lingo-price { font-size: 68px; }
  .lingo-card ul { top: 215px; left: 28px; gap: 29px; }
  .lingo-card li { font-size: 19px; white-space: normal; }
  .lingo-cta { bottom: 40px; left: 8%; width: 84%; height: 68px; }

  .faq-section { padding-top: 0; padding-bottom: 80px; }
  .faq-grid { position: relative; top: auto; flex-direction: column; gap: 0; margin-top: 32px; }
  .faq-column { width: 100%; }
  .faq-item summary { min-height: 82px; padding: 20px 0; font-size: 16px; line-height: 23px; }

  .site-footer { padding-bottom: 32px; }
  .footer-stage { padding-top: 48px; }
  .footer-top { flex-direction: column; align-items: center; }
  .footer-intro { width: 100%; align-items: center; }
  .footer-brand { margin-top: 0; }
  .footer-message { margin: 40px 0 0; text-align: center; }
  .footer-message p { font-size: 32px; }
  .footer-message strong { font-size: 54px; }
  .footer-art { width: 100%; height: 230px; margin-top: 12px; mask-size: 100% 100%; }
  .footer-art img { left: 50%; top: 12px; width: 420px; height: auto; transform: translateX(-50%); }
  .footer-store { margin: 18px 0 0; }
  .footer-bottom { width: 100%; height: auto; margin-top: 48px; padding-top: 32px; }
  .footer-nav { flex-wrap: wrap; gap: 20px 32px; }
  .social-links { gap: 24px; margin-top: 32px; }
  .legal-links { gap: 32px; margin-top: 16px; }
  .legal-links a { font-size: 14px; }
}

@media (max-width: 380px) {
  .hero h1 { font-size: 46px; }
  .hero-eyebrow { font-size: 20px; }
  .private-card li { font-size: 15px; }
  .lingo-card li { font-size: 17px; }
}

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