:root {
  --cream: #fffbf7;
  --ink: #1e2432;
  --muted: #5b705c;
  --green: #57c596;
  --deep: #287857;
  --forest: #1f4431;
  --mint: #e5f7ee;
  --border: #dae8db;
  --butter: #fff0bf;
  --sky: #eaf5fc;
  --lavender: #eee8fb;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
body {
  margin: 0;
  background: white;
  color: var(--ink);
  font-family: "Trebuchet MS", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
button,
input,
select {
  font: inherit;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
  color: inherit;
}
a {
  color: inherit;
  text-decoration: none;
}
button:disabled {
  cursor: default;
}
img {
  display: block;
  max-width: 100%;
}
p,
h1,
h2,
h3 {
  margin: 0;
}
p {
  line-height: 1.85;
}
ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
[hidden] {
  display: none !important;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid #2176b1;
  outline-offset: 5px;
}
::selection {
  background: var(--mint);
}
.container {
  width: min(1120px, calc(100% - 64px));
  margin: auto;
}
.icon-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}
.section-space {
  padding: 104px 0;
}
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 100;
  background: white;
  padding: 14px;
  border: 2px solid var(--deep);
  border-radius: 12px;
}
.skip-link:focus {
  top: 12px;
}
.eyebrow {
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--deep);
  margin-bottom: 20px;
}
.tiny-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  margin-right: 7px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 14px 24px;
  border: 2px solid transparent;
  border-radius: 14px;
  font-weight: 800;
  font-size: 16px;
  line-height: 1.35;
  transition: transform 0.16s, background 0.16s, box-shadow 0.16s;
  white-space: nowrap;
}
.button-primary {
  background: var(--green);
  border-color: var(--green);
  color: #103d29;
  box-shadow: 0 5px 0 #31956c;
}
.button-primary:hover {
  background: #67d0a4;
  border-color: #67d0a4;
  transform: translateY(-2px);
  box-shadow: 0 7px 0 #31956c;
}
.button-outline {
  background: white;
  border-color: var(--border);
  color: var(--deep);
  box-shadow: 0 4px 0 var(--border);
}
.button-outline:hover {
  background: #f3faf5;
  border-color: #bdd8c3;
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #bdd8c3;
}
.button:active {
  transform: translateY(4px);
  box-shadow: 0 1px 0 #31956c;
}
.button-small {
  min-height: 42px;
  padding: 10px 16px;
  font-size: 13px;
  border-radius: 12px;
}
.button-small .icon {
  width: 19px;
  height: 19px;
}
.full-width {
  width: 100%;
}
.icon-button {
  width: 44px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  background: white;
  border: 2px solid var(--border);
  border-radius: 12px;
}
.text-link,
.text-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--deep);
  font-weight: 800;
  background: none;
  border: 0;
  padding: 0;
}
.text-link {
  font-size: 16px;
  min-height: 44px;
  margin-top: 20px;
}
.text-link .icon {
  transition: transform 0.2s;
}
.text-link:hover .icon {
  transform: translateX(4px);
}
.text-button {
  font-size: 12px;
  min-height: 36px;
}
.text-button .icon {
  width: 17px;
  height: 17px;
}
.tag {
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 12px;
  font-weight: 800;
  background: #d0efdf;
  color: var(--deep);
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
  backdrop-filter: blur(12px);
}
.site-header.is-scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 2px 0 #edf4ee;
}
.header-inner {
  height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--deep);
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -1px;
  white-space: nowrap;
}
.brand img {
  width: 46px;
  height: 46px;
  object-fit: contain;
}
.desktop-nav {
  display: flex;
  gap: 29px;
  font-size: 14px;
  font-weight: 800;
  color: var(--muted);
}
.desktop-nav a:hover {
  color: var(--deep);
}
.menu-toggle {
  display: none;
}
.mobile-menu {
  padding: 12px 24px 24px;
  border-bottom: 2px solid var(--border);
  background: #fff;
}
.mobile-menu a,
.mobile-menu button[data-app-help] {
  display: block;
  padding: 14px 8px;
  font-weight: 800;
  color: var(--deep);
}
.mobile-menu button[data-app-help] {
  width: 100%;
  border: 0;
  background: transparent;
  text-align: left;
}
.hero {
  min-height: 650px;
  display: grid;
  grid-template-columns: 1fr 1.04fr;
  gap: 30px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 76px;
}
.hero h1 {
  font-size: clamp(45px, 4.8vw, 62px);
  line-height: 1.3;
  letter-spacing: -2px;
  font-weight: 900;
  color: var(--forest);
}
.marker {
  position: relative;
  z-index: 0;
  white-space: nowrap;
}
.marker:after {
  content: "";
  position: absolute;
  left: -3px;
  right: -4px;
  bottom: 6px;
  height: 14px;
  background: #e8f1bb;
  z-index: -1;
  border-radius: 7px;
  transform: rotate(-1deg);
}
.hero-intro {
  font-size: 16px;
  color: var(--muted);
  margin-top: 25px;
  line-height: 1.95;
}
.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 32px;
}
.hero-note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 19px;
}
.hero-scene {
  height: 480px;
  position: relative;
  --pointer-x: 0px;
  --pointer-y: 0px;
  isolation: isolate;
}
.scene-sun {
  position: absolute;
  width: 342px;
  height: 342px;
  left: 88px;
  top: 82px;
  background: #f0f5d7;
  border-radius: 50%;
  z-index: -2;
}
.scene-orbit {
  position: absolute;
  width: 440px;
  height: 380px;
  left: 35px;
  top: 47px;
  border: 2px dashed #e3ebcd;
  border-radius: 50%;
  transform: rotate(-18deg);
  z-index: -2;
}
.floating-card {
  position: absolute;
  background: white;
  border: 2px solid #dbe5d4;
  border-radius: 18px;
  padding: 15px 19px;
  box-shadow: 0 5px 0 #e2eaca;
  z-index: 3;
  transition: transform 0.28s var(--ease);
}
.hero-word {
  left: -10px;
  top: 72px;
  transform: translate(
      calc(var(--pointer-x) * -0.7),
      calc(var(--pointer-y) * -0.5)
    )
    rotate(-8deg);
  width: 191px;
}
.hero-word strong {
  font-size: 29px;
  color: var(--deep);
  display: block;
  margin: 7px 0 2px;
}
.hero-word > span:last-of-type {
  font-size: 11px;
  color: var(--muted);
}
.word-chip {
  font-size: 10px;
  color: var(--deep);
  font-weight: 800;
}
.hero-word > .icon {
  position: absolute;
  right: 14px;
  top: 18px;
  width: 21px;
  height: 21px;
  color: #c09837;
  fill: #ffdd72;
}
.hero-course {
  right: -8px;
  top: 327px;
  display: flex;
  gap: 11px;
  align-items: center;
  width: 258px;
  transform: translate(
      calc(var(--pointer-x) * 0.8),
      calc(var(--pointer-y) * 0.6)
    )
    rotate(5deg);
  padding: 14px;
}
.hero-course strong {
  display: block;
  font-size: 12px;
}
.hero-course div > span {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-top: 4px;
}
.scene-icon {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: var(--mint);
  color: var(--deep);
}
.scene-icon .icon {
  width: 22px;
  height: 22px;
}
.mini-check {
  margin-left: auto;
  background: #d9f2df;
  color: var(--deep);
  border-radius: 50%;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
}
.mini-check .icon {
  width: 15px;
  height: 15px;
}
.hero-speech {
  position: absolute;
  right: 11px;
  top: 61px;
  background: var(--butter);
  border: 2px solid #ddc36b;
  padding: 14px 20px;
  border-radius: 20px;
  color: #735a1c;
  font-weight: 800;
  transform: rotate(7deg);
  font-size: 15px;
}
.hero-speech span {
  position: absolute;
  bottom: -10px;
  left: 28px;
  width: 16px;
  height: 16px;
  background: var(--butter);
  border-right: 2px solid #ddc36b;
  border-bottom: 2px solid #ddc36b;
  transform: rotate(45deg);
}
.mascot-button {
  position: absolute;
  width: 310px;
  height: 310px;
  left: 123px;
  top: 111px;
  padding: 0;
  border: 0;
  background: transparent;
  z-index: 2;
  border-radius: 40px;
}
.mascot-button:focus-visible {
  outline-offset: 0;
}
.lily-pad {
  position: absolute;
  left: 112px;
  top: 365px;
  width: 316px;
  height: 53px;
  border-radius: 50%;
  background: #cbdc9d;
  transform: rotate(-3deg);
  z-index: -1;
}
.lily-pad:after {
  content: "";
  position: absolute;
  width: 70px;
  height: 25px;
  right: 10px;
  top: 2px;
  background: #f0f5d7;
  clip-path: polygon(100% 0, 100% 100%, 0 50%);
}
.scene-book {
  position: absolute;
  border: 2px solid #8265ab;
  border-bottom-width: 5px;
  border-radius: 9px;
  background: #d8c5f0;
  z-index: 3;
  box-shadow: 3px 5px 0 #ddd8df;
}
.book-one {
  width: 87px;
  height: 112px;
  bottom: 31px;
  left: 40px;
  transform: rotate(-12deg);
  padding: 12px;
  color: #604987;
}
.book-one > .icon {
  position: absolute;
  right: 9px;
  top: 9px;
  width: 18px;
  height: 18px;
}
.book-one > span {
  font-size: 19px;
  font-weight: 900;
  line-height: 1.15;
  display: block;
  margin-top: 14px;
}
.book-one > b {
  font-size: 7px;
  letter-spacing: 1px;
  position: absolute;
  bottom: 9px;
}
.book-two {
  width: 71px;
  height: 86px;
  bottom: 18px;
  left: 113px;
  background: #ffe6a0;
  border-color: #c69b45;
  color: #8a6b22;
  transform: rotate(8deg);
  padding: 9px;
}
.book-two > span {
  font-size: 9px;
  font-weight: 900;
}
.book-two > .icon {
  width: 30px;
  height: 30px;
  display: block;
  margin: 9px auto;
  fill: #ffeec3;
}
.scene-leaf {
  position: absolute;
  background: var(--green);
  border-radius: 70% 0 70% 0;
  width: 35px;
  height: 19px;
  z-index: -1;
}
.leaf-one {
  right: 2px;
  top: 233px;
  transform: rotate(-38deg);
}
.leaf-two {
  left: 74px;
  top: 230px;
  transform: rotate(25deg);
  width: 26px;
  height: 15px;
}
.mascot-hint {
  position: absolute;
  bottom: -4px;
  right: 100px;
  font-size: 11px;
  color: var(--muted);
}
.frog-sprite {
  display: block;
  position: relative;
  aspect-ratio: 1;
  width: 100%;
  overflow: hidden;
}
.frog-sprite img {
  width: 100%;
  height: 100%;
  max-width: none;
  position: absolute;
  left: 0;
  top: 0;
  object-fit: contain;
}
.feature-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid #edf1e9;
  border-bottom: 2px solid #edf1e9;
  padding: 23px 0;
  gap: 20px;
}
.feature-strip > a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  border-radius: 16px;
  min-height: 68px;
  transition: transform 0.2s;
}
.feature-strip > a:hover {
  transform: translateY(-4px);
}
.feature-icon {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  border-radius: 15px;
  flex-shrink: 0;
}
.feature-icon > .icon {
  width: 26px;
  height: 26px;
}
.mint {
  background: var(--mint);
  color: var(--deep);
}
.butter {
  background: var(--butter);
  color: #8a681b;
}
.lavender {
  background: var(--lavender);
  color: #73549d;
}
.sky {
  background: #deeffa;
  color: #3b789c;
}
.feature-strip strong {
  display: block;
  font-size: 14px;
  font-weight: 900;
}
.feature-strip small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 6px;
}
.section-heading h2,
.feature-copy h2,
.faq-heading h2 {
  font-size: 40px;
  line-height: 1.4;
  letter-spacing: -1px;
  font-weight: 900;
  color: var(--forest);
}
.section-heading > p:last-child {
  font-size: 16px;
  color: var(--muted);
  margin-top: 17px;
}
.learning-path .section-heading {
  margin-bottom: 48px;
}
.journey-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 76px;
  align-items: start;
}
.journey-step {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 26px 20px;
  gap: 18px;
  min-height: 164px;
  background: transparent;
  border: 2px solid transparent;
  border-radius: 20px;
  text-align: left;
  margin-bottom: 28px;
  transition: background 0.3s, border-color 0.3s;
}
.journey-step:last-child {
  margin-bottom: 0;
}
.journey-step.is-active {
  background: var(--mint);
  border-color: #b9e5ce;
}
.journey-step:hover {
  background: #f2f9f0;
}
.step-number {
  width: 43px;
  height: 43px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #edf1e6;
  border: 2px solid #dde4d2;
  color: #71836a;
  font-weight: 900;
  font-size: 14px;
}
.is-active > .step-number {
  background: var(--green);
  border-color: #3b9d71;
  color: #173e28;
}
.journey-step strong {
  display: block;
  font-size: 19px;
  line-height: 1.5;
}
.journey-step small {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}
.journey-step > .icon {
  width: 20px;
  margin-left: auto;
  color: var(--deep);
  opacity: 0.25;
}
.journey-step.is-active > .icon {
  opacity: 1;
}
.journey-stage {
  position: sticky;
  top: 124px;
  background: var(--cream);
  border: 2px solid #e4ebd6;
  border-radius: 32px;
  padding: 29px 25px 21px;
  box-shadow: 0 6px 0 #e5ebd7;
  overflow: hidden;
}
.stage-kicker {
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  font-weight: 800;
  margin-bottom: 7px;
}
.journey-stage h3 {
  font-size: 23px;
  color: var(--deep);
  text-align: center;
  line-height: 1.5;
}
.path-map {
  position: relative;
  height: 285px;
  margin-top: 12px;
}
.map-line {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  overflow: visible;
}
.map-track,
#journey-line {
  fill: none;
  stroke-linecap: round;
  stroke-width: 7;
}
.map-track {
  stroke: #e3ead9;
  stroke-dasharray: 3 15;
}
#journey-line {
  stroke: var(--green);
  transition: stroke-dashoffset 0.65s var(--ease);
}
.path-node {
  width: 93px;
  height: 93px;
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 2px solid #d8e2d0;
  border-radius: 23px;
  background: white;
  box-shadow: 0 5px 0 #e1e8d9;
  transition: transform 0.4s var(--ease), background 0.3s;
}
.path-node > .icon {
  width: 26px;
  height: 26px;
  color: var(--muted);
}
.path-node > b {
  font-size: 11px;
  color: var(--muted);
}
.path-node.is-active {
  background: #dbf2b9;
  border-color: #a9c87a;
  box-shadow: 0 5px 0 #abc583;
  transform: translateY(-4px);
}
.path-node.is-active > .icon,
.path-node.is-active > b {
  color: var(--deep);
}
.node-0 {
  left: 6%;
  top: 12px;
}
.node-1 {
  right: 4%;
  top: 28px;
}
.node-2 {
  right: 4%;
  bottom: 12px;
}
.node-3 {
  left: 2%;
  bottom: 11px;
}
.journey-frog {
  position: absolute;
  left: 35%;
  top: 74px;
  width: 155px;
}
.journey-stage > #journey-copy {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  min-height: 45px;
  line-height: 1.85;
  margin-top: 8px;
}
.scroll-cue {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  color: #77876b;
  margin-top: 13px;
}
.scroll-cue > .icon {
  width: 15px;
  height: 15px;
}
.band-mint {
  background: #eff9f2;
}
.band-sky {
  background: var(--sky);
}
.band-cream {
  background: var(--cream);
}
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 92px;
  align-items: center;
}
.feature-copy h2 {
  margin-bottom: 24px;
}
.feature-intro {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.95;
  max-width: 460px;
}
.check-list {
  margin-top: 27px;
}
.check-list li {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  margin-top: 17px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.9;
}
.check-list li > .icon {
  color: var(--deep);
  width: 21px;
  height: 21px;
  margin-top: 2px;
  stroke-width: 2.8;
}
.check-list strong {
  font-size: 14px;
  color: var(--ink);
}
.lesson-facts {
  display: flex;
  gap: 29px;
  margin-top: 35px;
}
.lesson-facts > span {
  font-size: 11px;
  color: var(--muted);
}
.lesson-facts b {
  font-size: 28px;
  font-weight: 900;
  color: var(--deep);
  display: block;
  line-height: 1.3;
  margin-bottom: 6px;
}
.lesson-facts small {
  font-size: 11px;
  margin-left: 4px;
}
.fine-print {
  font-size: 10px;
  color: var(--muted);
  margin-top: 19px;
  line-height: 1.9;
}
.planner-wrap {
  position: relative;
  padding: 15px 14px 44px 20px;
}
.planner-top-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-right: 12px;
}
.planner-top-label > .icon {
  width: 38px;
  height: 38px;
  color: var(--deep);
  transform: rotate(10deg);
}
.week-planner,
.word-demo,
.chat-demo,
.exam-demo {
  border: 2px solid var(--border);
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 7px 0 #dce9de;
  padding: 25px;
}
.demo-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  font-weight: 900;
}
.demo-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  background: #f2f5ef;
  border-radius: 6px;
  padding: 4px 7px;
  white-space: nowrap;
}
.week-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 7px;
  margin: 24px 0;
}
.week-days > button {
  height: 41px;
  padding: 0;
  border-radius: 12px;
  border: 2px solid #e3eadd;
  background: white;
  font-size: 13px;
  color: var(--muted);
  font-weight: 800;
  box-shadow: 0 2px 0 #e3eadd;
}
.week-days > button.is-active {
  background: var(--green);
  border-color: var(--green);
  color: #103d29;
  box-shadow: 0 3px 0 #31956c;
}
.week-days > button:nth-last-child(-n + 2) {
  color: #795da0;
  background: #f6f3fc;
  border-color: #e6def1;
}
.week-days > button:nth-last-child(-n + 2).is-active {
  background: #d4c2eb;
  border-color: #b7a0d3;
  box-shadow: 0 3px 0 #a78fc5;
  color: #4e396b;
}
.schedule-heading {
  display: flex;
  gap: 13px;
  align-items: center;
  margin-bottom: 17px;
}
.schedule-heading h3 {
  font-size: 17px;
  margin-bottom: 4px;
}
.schedule-heading p {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.6;
}
.time-slots {
  display: grid;
  gap: 9px;
}
.time-slots > button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  padding: 13px 15px;
  min-height: 43px;
  background: white;
  border: 2px solid #e6ecdf;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 900;
  color: var(--forest);
  transition: background 0.2s, border-color 0.2s;
}
.time-slots > button:after {
  content: "选择时段";
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
}
.time-slots > button.is-active {
  background: var(--mint);
  border-color: #78c49a;
}
.time-slots > button.is-active:after {
  content: "已选时段";
}
.time-slots > button:hover {
  border-color: #78c49a;
}
.demo-feedback {
  font-size: 11px;
  min-height: 38px;
  color: var(--muted);
  line-height: 1.8;
  margin: 15px 0 12px;
}
.demo-note {
  font-size: 9px;
  color: var(--muted);
  line-height: 1.8;
  margin-top: 13px;
  text-align: center;
}
.planner-frog {
  width: 133px;
  position: absolute;
  right: -43px;
  bottom: -13px;
}
.words-section {
  gap: 86px;
  padding: 130px 0;
}
.word-scene {
  position: relative;
  padding: 12px 34px 68px 4px;
}
.word-demo {
  transform: rotate(-2deg);
  border-color: #e5dfbd;
  box-shadow: 0 7px 0 #e8dfb9;
  padding: 24px;
  background: #fffef9;
}
.word-doodle {
  position: absolute;
  right: -13px;
  top: -27px;
  font-size: 68px;
  font-weight: 900;
  color: #f2d472;
  transform: rotate(12deg);
  z-index: -1;
}
.book-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 20px 0;
}
.book-tabs > button {
  border: 1px solid #e3dfcc;
  border-radius: 8px;
  background: white;
  padding: 7px 9px;
  font-size: 10px;
  color: #7b785f;
  font-weight: 800;
}
.book-tabs > button.is-active {
  background: var(--butter);
  border-color: #dec570;
  color: #7a5d19;
}
.word-card-wrap {
  perspective: 900px;
  margin: 16px 0;
}
.word-card {
  display: block;
  width: 100%;
  height: 263px;
  border: 0;
  background: transparent;
  padding: 0;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.65s var(--ease);
  border-radius: 17px;
}
.word-card.is-flipped {
  transform: rotateY(180deg);
}
.word-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid #f0df9f;
  background: #fff8dd;
  border-radius: 17px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.word-front strong {
  font-size: 35px;
  color: var(--forest);
  margin: 14px 0 4px;
}
.phonetic {
  font-size: 13px;
  color: #7e805d;
}
.word-face > small {
  font-size: 10px;
  color: #8a8060;
  margin-top: 13px;
}
.word-back {
  transform: rotateY(180deg);
  background: #eef7df;
  border-color: #c5d8a5;
  gap: 9px;
}
.word-back strong {
  font-size: 31px;
  color: var(--forest);
  margin: 3px 0 8px;
}
.word-back > span {
  font-size: 13px;
  color: var(--muted);
}
.apple-art {
  width: 68px;
  height: 62px;
  position: relative;
  border-radius: 40% 42% 45% 43%;
  background: #ee7565;
  border: 3px solid #ce5f52;
  box-shadow: inset 8px 0 0 #f49379;
  transform: rotate(-4deg);
}
.apple-art:before {
  content: "";
  width: 6px;
  height: 18px;
  position: absolute;
  top: -14px;
  left: 31px;
  background: #88693f;
  border-radius: 4px;
  transform: rotate(14deg);
}
.apple-art:after {
  content: "";
  position: absolute;
  right: 0;
  top: -13px;
  width: 22px;
  height: 13px;
  background: #7bae6b;
  border: 2px solid #628b50;
  border-radius: 80% 10% 80% 10%;
  transform: rotate(-15deg);
}
.word-controls {
  display: flex;
  gap: 10px;
}
.word-controls > .button {
  flex: 1;
}
.word-frog {
  position: absolute;
  bottom: -5px;
  right: -24px;
  width: 163px;
}
.word-quiz {
  background: #fff9e4;
  border-radius: 12px;
  padding: 13px;
  margin-top: 18px;
}
.word-quiz > strong {
  font-size: 12px;
}
.quiz-options {
  display: flex;
  gap: 6px;
  margin: 12px 0;
}
.quiz-options > button {
  flex: 1;
  padding: 9px 5px;
  background: white;
  border: 2px solid #e3dfcc;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 800;
}
.is-correct {
  border-color: #5db88a !important;
  background: #e7f7ed !important;
  color: #24683c !important;
}
.is-wrong {
  background: #fff0e7 !important;
  border-color: #d9906d !important;
  color: #935033 !important;
}
.wrongbook-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  font-weight: 800;
  padding: 7px 10px;
  background: #f7e8d9;
  color: #955c3c;
  border-radius: 9px;
}
.wrongbook-pill > .icon {
  width: 15px;
  height: 15px;
}
.three-levels {
  display: flex;
  align-items: center;
  gap: 13px;
  margin: 30px 0 20px;
}
.three-levels > span {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  font-weight: 800;
}
.three-levels b {
  width: 31px;
  height: 31px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: white;
  border: 2px solid #cce1e9;
  color: #4b8093;
  font-size: 12px;
  box-shadow: 0 3px 0 #cce1e9;
}
.three-levels i {
  font-style: normal;
  color: #8fb6c3;
}
.support-copy {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.95;
  max-width: 415px;
}
.chat-scene {
  position: relative;
  padding: 28px 10px 58px 20px;
}
.chat-demo {
  padding: 0;
  overflow: hidden;
  border-color: #c9dfe9;
  box-shadow: 0 7px 0 #d0e2e9;
  min-height: 418px;
}
.chat-header {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 20px 23px;
  border-bottom: 2px solid #e8f1f6;
}
.ai-avatar {
  width: 46px;
  height: 46px;
  background: #eef4d4;
  border-radius: 50%;
  flex-shrink: 0;
}
.ai-avatar > img {
  width: 44px;
  height: 44px;
}
.chat-header strong {
  font-size: 14px;
}
.chat-header small {
  display: block;
  color: var(--muted);
  font-size: 10px;
  margin-top: 5px;
}
.live-dot {
  background: var(--green);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-left: auto;
}
.chat-messages {
  padding: 23px;
  min-height: 158px;
  max-height: 328px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 13px;
}
.chat-message {
  max-width: 91%;
  padding: 13px 16px;
  border-radius: 17px;
  font-size: 14px;
  line-height: 1.6;
  flex-shrink: 0;
}
.chat-message.is-ai {
  background: #edf4f8;
  border-bottom-left-radius: 5px;
  align-self: flex-start;
}
.chat-role {
  display: block;
  font-size: 9px;
  color: var(--muted);
  margin-bottom: 5px;
}
.chat-message p {
  line-height: 1.7;
}
.chat-message.is-user {
  background: #dff4e7;
  border-bottom-right-radius: 5px;
  align-self: flex-end;
  color: #245e3d;
}
.chat-bottom {
  padding: 8px 23px 4px;
}
.chat-bottom > .demo-label {
  background: transparent;
  padding: 0;
}
.reply-chip {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 13px 16px;
  background: white;
  border: 2px solid #c9dfe9;
  border-radius: 12px;
  color: #416e82;
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 3px 0 #d0e2e9;
  margin: 12px 0 9px;
  min-height: 43px;
}
.reply-chip:hover {
  background: #f1f8fc;
}
.reply-chip > .icon {
  width: 20px;
  height: 20px;
}
.chat-demo > .demo-note {
  margin: 9px 20px 18px;
}
.chat-frog {
  position: absolute;
  right: -50px;
  bottom: -20px;
  width: 158px;
}
.chat-sticker {
  position: absolute;
  top: -5px;
  left: 38px;
  background: #ffedb6;
  color: #947522;
  padding: 9px 13px;
  border: 2px solid #dfcd8d;
  border-radius: 12px;
  font-weight: 900;
  transform: rotate(-8deg);
  font-size: 13px;
}
.chat-decoration {
  position: absolute;
  right: -17px;
  top: 0;
  background: #dceaf6;
  width: 62px;
  height: 62px;
  border-radius: 18px;
  transform: rotate(12deg);
  display: grid;
  place-items: center;
  color: #51829a;
  z-index: -1;
}
.chat-decoration > .icon {
  width: 32px;
  height: 32px;
}
.exam-section {
  gap: 84px;
  padding: 128px 0;
}
.exam-scene {
  position: relative;
  padding: 0 24px 54px 0;
}
.exam-demo {
  border-color: #d8d3e5;
  box-shadow: 0 7px 0 #e1dbea;
  padding: 24px;
}
.exam-demo .demo-top > span:first-child {
  display: flex;
  align-items: center;
  gap: 7px;
}
.exam-demo .demo-top .icon {
  width: 21px;
  height: 21px;
  color: #8064aa;
}
.exam-progress {
  display: flex;
  gap: 7px;
  margin: 21px 0 22px;
}
.exam-progress span {
  flex: 1;
  text-align: center;
  font-size: 9px;
  color: #8a8494;
  background: #f2eff6;
  padding: 8px 3px;
  border-radius: 7px;
}
.exam-progress .is-current {
  background: #e3d7f4;
  color: #705193;
  font-weight: 800;
}
.listen-track {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #f6f3fb;
  padding: 12px;
  border-radius: 13px;
}
.round-button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: #e3d7f4;
  border: 2px solid #c5afd9;
  border-radius: 50%;
  color: #75559b;
  flex-shrink: 0;
}
.round-button > .icon {
  width: 20px;
  height: 20px;
}
.listen-track strong {
  font-size: 11px;
  display: block;
}
.listen-track div > span {
  font-size: 9px;
  color: var(--muted);
  display: block;
  margin-top: 5px;
  line-height: 1.7;
}
.audio-bars {
  display: flex;
  align-items: center;
  gap: 3px;
  margin-left: auto;
  height: 26px;
  color: #b0a0c8;
}
.audio-bars i {
  display: block;
  width: 3px;
  height: 10px;
  background: currentColor;
  border-radius: 4px;
}
.audio-bars i:nth-child(2n) {
  height: 19px;
}
.audio-bars i:nth-child(3) {
  height: 26px;
}
.is-speaking ~ div ~ .audio-bars i {
  animation: wave 0.6s ease-in-out infinite alternate;
}
.exam-demo h3 {
  font-size: 15px;
  line-height: 1.65;
  margin: 23px 0 16px;
}
.exam-options {
  display: grid;
  gap: 8px;
}
.exam-options > button {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: 2px solid #e5e0ed;
  background: white;
  border-radius: 11px;
  font-size: 11px;
  min-height: 41px;
}
.exam-options > button > b {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  background: #f2eff6;
  border-radius: 6px;
  color: #8a759e;
  font-size: 10px;
  flex-shrink: 0;
}
.exam-frog {
  position: absolute;
  width: 138px;
  bottom: -14px;
  right: -25px;
}
.exam-sticker {
  position: absolute;
  top: -18px;
  left: -24px;
  font-size: 12px;
  font-weight: 900;
  color: #795da0;
  border: 2px solid #c5b3de;
  background: #eae1f7;
  padding: 9px 15px;
  border-radius: 12px;
  transform: rotate(-7deg);
}
.centered {
  text-align: center;
}
.method-section .section-heading > p:last-child {
  font-size: 14px;
}
.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 54px;
  margin-top: 61px;
}
.method-item {
  text-align: center;
}
.method-icon {
  width: 74px;
  height: 74px;
  display: grid;
  place-items: center;
  border-radius: 24px;
  border: 2px solid #d7e4c9;
  margin: 0 auto 23px;
  box-shadow: 0 5px 0 #e2e5cd;
}
.method-icon > .icon {
  width: 35px;
  height: 35px;
}
.method-item h3 {
  font-size: 21px;
  margin-bottom: 14px;
  color: var(--forest);
}
.method-item p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.95;
}
.progress-ribbon {
  background: #e8f3dc;
  border: 2px solid #d3e4c0;
  border-radius: 23px;
  padding: 24px 110px 24px 25px;
  position: relative;
  display: flex;
  align-items: center;
  gap: 17px;
  margin-top: 69px;
  min-height: 90px;
}
.progress-ribbon > .icon {
  width: 34px;
  height: 34px;
  color: #967126;
  fill: #ffdfa0;
}
.progress-ribbon p {
  font-size: 14px;
  font-weight: 800;
  color: #4e7548;
}
.ribbon-frog {
  width: 139px;
  position: absolute;
  right: 14px;
  bottom: -6px;
}
.faq-section {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  padding-bottom: 130px;
}
.faq-heading h2 {
  font-size: 33px;
}
.faq-frog {
  width: 140px;
  margin: 22px 0 0 24px;
}
.faq-list details {
  border-bottom: 2px solid #edf1e8;
}
.faq-list details:first-child {
  border-top: 2px solid #edf1e8;
}
.faq-list summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  cursor: pointer;
  padding: 23px 0;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.65;
}
.faq-list summary::-webkit-details-marker {
  display: none;
}
.faq-list summary > span {
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--mint);
  width: 28px;
  height: 28px;
  color: var(--deep);
  font-size: 20px;
  flex-shrink: 0;
  transition: transform 0.2s;
}
.faq-list details[open] summary > span {
  transform: rotate(45deg);
}
.faq-list details > p {
  font-size: 12px;
  line-height: 1.95;
  color: var(--muted);
  padding: 0 34px 24px 0;
}
.download-section {
  background: var(--deep);
  color: white;
  overflow: hidden;
  position: relative;
}
.download-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  padding: 81px 0;
  align-items: center;
  min-height: 457px;
}
.download-copy .eyebrow {
  color: #bce6c9;
  font-size: 12px;
}
.download-copy h2 {
  font-size: 41px;
  line-height: 1.4;
  letter-spacing: -1px;
  font-weight: 900;
}
.download-copy > p:not(.eyebrow):not(.download-note) {
  font-size: 14px;
  color: #d1e9d8;
  margin: 20px 0 25px;
}
.download-actions {
  display: flex;
  gap: 13px;
  flex-wrap: wrap;
}
.download-channel {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 158px;
  padding: 15px 20px;
  border-radius: 16px;
  background: #fff;
  color: var(--deep);
  box-shadow: 0 5px 0 #badfcb;
}
.download-channel strong,
.download-channel small {
  display: block;
}
.download-channel small {
  margin-top: 3px;
  font-size: 11px;
  color: #668777;
}
.button-white {
  background: white;
  color: var(--deep);
  border-color: white;
  box-shadow: 0 5px 0 #badfcb;
  font-size: 14px;
}
.button-white:hover {
  background: #edf7e8;
  transform: translateY(-2px);
}
.button-dark-outline {
  background: transparent;
  border-color: #75b795;
  color: white;
  box-shadow: 0 4px 0 #185c3e;
  font-size: 14px;
}
.button-dark-outline:hover {
  background: #34855f;
  transform: translateY(-2px);
}
.download-note {
  color: #b7dbc5;
  font-size: 10px;
  margin-top: 19px;
}
.download-art {
  position: relative;
  min-height: 290px;
}
.qr-card {
  position: absolute;
  right: 5px;
  top: 28px;
  width: 189px;
  padding: 18px;
  border-radius: 24px;
  background: white;
  box-shadow: 0 6px 0 #164f36;
  color: var(--deep);
  border: 2px solid #bed9c4;
  transform: rotate(5deg);
  z-index: 2;
}
.qr-card > img,
.qr-card > .app-contact-graphic {
  width: 145px;
  height: 145px;
  margin: auto;
}
.qr-card strong {
  display: block;
  text-align: center;
  font-size: 12px;
  margin: 9px -6px 5px;
}
.qr-card > span {
  display: block;
  text-align: center;
  font-size: 10px;
  color: var(--muted);
}
.app-contact-graphic {
  width: 145px;
  height: 145px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: auto;
  background: var(--mint);
  border-radius: 16px;
  font-size: 12px;
  font-weight: 800;
}
.app-contact-graphic .icon {
  width: 58px;
  height: 58px;
}
.app-contact-card > .wechat-id {
  font-size: 14px;
  font-weight: 800;
  color: var(--deep);
  user-select: all;
}
.download-frog {
  width: 228px;
  position: absolute;
  left: -1px;
  top: 100px;
  z-index: 3;
}
.download-orbit {
  position: absolute;
  inset: -20px -50px -50px 10px;
  border: 2px dashed #5fa77f;
  border-radius: 50%;
  transform: rotate(-25deg);
}
.site-footer {
  background: var(--cream);
  padding-top: 50px;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.2fr 1.2fr 1.2fr 0.8fr;
  gap: 35px;
  padding-bottom: 43px;
  align-items: start;
}
.footer-main .brand {
  font-size: 24px;
  margin-left: -8px;
}
.footer-main > p {
  font-size: 12px;
  color: var(--muted);
  margin-top: 9px;
}
.footer-main > div {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
  padding-top: 8px;
}
.footer-main > div > strong {
  font-size: 13px;
  color: var(--forest);
}
.footer-main nav {
  display: flex;
  flex-direction: column;
  gap: 15px;
  font-size: 11px;
  color: var(--muted);
  padding-top: 10px;
}
.footer-bottom {
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
  font-size: 10px;
  color: var(--muted);
}
.app-dialog {
  width: min(430px, calc(100% - 32px));
  border: 2px solid var(--border);
  border-radius: 28px;
  padding: 25px 30px 33px;
  text-align: center;
  color: var(--ink);
  background: white;
  box-shadow: 0 8px 0 #ccd8c6;
  max-height: calc(100dvh - 40px);
  overflow: auto;
}
.app-dialog::backdrop {
  background: rgba(24, 57, 37, 0.4);
  backdrop-filter: blur(4px);
}
.dialog-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
}
.dialog-close > .icon {
  width: 19px;
  height: 19px;
}
.dialog-frog {
  width: 151px;
  margin: 0 auto 8px;
}
.app-dialog .eyebrow {
  font-size: 11px;
  margin-bottom: 10px;
}
.app-dialog h2 {
  font-size: 25px;
  font-weight: 900;
  color: var(--forest);
  margin-bottom: 14px;
}
.app-dialog > p:not(.eyebrow):not(.demo-feedback) {
  font-size: 12px;
  line-height: 1.9;
  color: var(--muted);
}
.wechat-contact {
  padding: 20px 0 3px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.wechat-contact > span {
  font-size: 10px;
  color: var(--muted);
}
.wechat-contact > strong {
  font-size: 23px;
  letter-spacing: 1px;
  color: var(--deep);
  user-select: all;
}
.app-dialog .demo-feedback {
  min-height: 20px;
  margin-top: 8px;
}
.app-dialog > .button {
  font-size: 14px;
}
.noscript-note {
  padding: 18px;
  text-align: center;
  font-size: 12px;
  background: var(--butter);
}
@keyframes wave {
  from {
    transform: scaleY(0.6);
  }
  to {
    transform: scaleY(1);
  }
}
@media (max-width: 1050px) {
  .container {
    width: calc(100% - 48px);
  }
  .desktop-nav {
    gap: 19px;
    font-size: 12px;
  }
  .brand {
    font-size: 24px;
  }
  .hero {
    gap: 0;
    min-height: 620px;
  }
  .hero h1 {
    font-size: 49px;
  }
  .hero-intro {
    font-size: 14px;
  }
  .hero-actions > .button {
    padding: 13px 18px;
    font-size: 14px;
  }
  .hero-scene {
    transform: scale(0.89);
    transform-origin: center right;
  }
  .split {
    gap: 54px;
  }
  .section-heading h2,
  .feature-copy h2 {
    font-size: 35px;
  }
  .journey-layout {
    gap: 40px;
  }
  .journey-step {
    padding: 20px 12px;
    gap: 12px;
  }
  .journey-step strong {
    font-size: 17px;
  }
  .journey-step small {
    font-size: 12px;
  }
  .path-node {
    width: 83px;
    height: 83px;
  }
  .journey-frog {
    width: 133px;
    left: 38%;
    top: 100px;
  }
  .planner-frog {
    right: -25px;
    width: 113px;
  }
  .word-scene {
    padding-right: 15px;
  }
  .word-frog {
    right: -14px;
    width: 139px;
  }
  .chat-frog {
    right: -23px;
    width: 138px;
  }
  .method-grid {
    gap: 35px;
  }
  .download-actions > .button {
    font-size: 12px;
    padding: 13px 17px;
  }
  .download-frog {
    width: 192px;
    left: -20px;
    top: 117px;
  }
  .qr-card {
    right: 0;
  }
  .footer-main {
    gap: 20px;
  }
}
@media (max-width: 800px) {
  .desktop-nav {
    display: none;
  }
  .header-inner {
    height: 74px;
  }
  .header-contact {
    margin-left: auto;
  }
  .menu-toggle {
    display: grid;
  }
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 40px 0 46px;
    min-height: 0;
  }
  .hero h1 {
    font-size: 49px;
  }
  .hero .eyebrow {
    font-size: 11px;
    margin-bottom: 15px;
  }
  .hero-intro {
    font-size: 14px;
    margin-top: 19px;
  }
  .hero-actions {
    justify-content: center;
    margin-top: 25px;
  }
  .hero-scene {
    width: 510px;
    max-width: 100%;
    margin: 18px auto 0;
    transform: scale(0.9);
    transform-origin: center;
    height: 455px;
  }
  .hero-note {
    font-size: 11px;
  }
  .feature-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 13px;
    padding: 18px 0;
  }
  .feature-strip > a {
    justify-content: flex-start;
    padding-left: 18px;
  }
  .section-space {
    padding: 77px 0;
  }
  .section-heading h2,
  .feature-copy h2 {
    font-size: 34px;
  }
  .section-heading > p:last-child {
    font-size: 14px;
  }
  .journey-layout {
    gap: 20px;
  }
  .journey-step {
    gap: 11px;
    padding: 19px 11px;
    min-height: 182px;
    margin-bottom: 22px;
  }
  .step-number {
    width: 33px;
    height: 33px;
    font-size: 11px;
  }
  .journey-step strong {
    font-size: 14px;
  }
  .journey-step small {
    font-size: 10px;
  }
  .journey-step > .icon {
    display: none;
  }
  .journey-stage {
    padding: 20px 13px 15px;
    top: 101px;
    border-radius: 24px;
  }
  .journey-stage h3 {
    font-size: 18px;
  }
  .path-map {
    height: 259px;
  }
  .path-node {
    width: 65px;
    height: 71px;
    border-radius: 17px;
    gap: 6px;
  }
  .path-node > .icon {
    width: 23px;
    height: 23px;
  }
  .path-node > b {
    font-size: 9px;
  }
  .journey-frog {
    width: 112px;
    left: 34%;
    top: 98px;
  }
  .journey-stage > #journey-copy {
    font-size: 10px;
    min-height: 55px;
  }
  .split {
    grid-template-columns: 1fr;
    gap: 47px;
    max-width: 560px;
  }
  .feature-intro {
    font-size: 14px;
    max-width: 500px;
  }
  .feature-copy h2 {
    margin-bottom: 18px;
  }
  .planner-wrap {
    max-width: 480px;
    justify-self: center;
    width: 100%;
    padding-right: 29px;
  }
  .planner-frog {
    right: -15px;
    bottom: 3px;
    width: 129px;
  }
  .words-section .word-scene,
  .exam-section .exam-scene {
    order: 2;
  }
  .word-scene {
    max-width: 464px;
    justify-self: center;
    width: 100%;
    padding: 0 34px 60px 12px;
  }
  .word-frog {
    width: 157px;
    right: -6px;
    bottom: -4px;
  }
  .chat-scene {
    max-width: 470px;
    justify-self: center;
    width: 100%;
    padding: 28px 28px 58px 12px;
  }
  .chat-frog {
    right: -17px;
    bottom: -9px;
    width: 150px;
  }
  .exam-scene {
    max-width: 464px;
    justify-self: center;
    width: 100%;
    padding-left: 12px;
    padding-right: 31px;
  }
  .exam-frog {
    right: -9px;
    width: 146px;
  }
  .method-grid {
    gap: 26px;
  }
  .method-item h3 {
    font-size: 17px;
  }
  .method-item p {
    font-size: 12px;
  }
  .faq-section {
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 560px;
  }
  .faq-heading {
    position: relative;
  }
  .faq-heading h2 {
    font-size: 32px;
  }
  .faq-frog {
    position: absolute;
    right: 14px;
    bottom: -5px;
    margin: 0;
    width: 126px;
  }
  .faq-list {
    margin-top: 20px;
  }
  .download-layout {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 66px 0 47px;
    max-width: 560px;
  }
  .download-copy h2 {
    font-size: 37px;
  }
  .download-art {
    width: 390px;
    max-width: 100%;
    margin: 12px auto 0;
    min-height: 270px;
  }
  .download-frog {
    width: 224px;
    left: 0;
    top: 97px;
  }
  .qr-card {
    right: 12px;
    top: 20px;
  }
  .footer-main {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }
}
@media (max-width: 520px) {
  html {
    scroll-padding-top: 83px;
  }
  .container {
    width: calc(100% - 40px);
  }
  .header-inner {
    height: 67px;
    gap: 10px;
  }
  .brand {
    font-size: 21px;
    gap: 3px;
  }
  .brand img {
    width: 39px;
    height: 39px;
  }
  .header-contact {
    min-height: 35px;
    padding: 8px 11px;
    font-size: 10px;
    border-radius: 10px;
    box-shadow: 0 3px 0 var(--border);
  }
  .menu-toggle {
    width: 35px;
    height: 35px;
    border-radius: 10px;
  }
  .menu-toggle > .icon {
    width: 20px;
    height: 20px;
  }
  .hero {
    padding: 34px 0 26px;
  }
  .hero h1 {
    font-size: 41px;
    letter-spacing: -1.5px;
  }
  .marker:after {
    height: 11px;
    bottom: 4px;
  }
  .hero-intro {
    font-size: 12px;
    line-height: 2;
  }
  .hero .eyebrow {
    font-size: 10px;
    letter-spacing: 0.4px;
  }
  .hero-actions {
    gap: 10px;
  }
  .hero-actions > .button {
    padding: 13px 16px;
    font-size: 12px;
    min-height: 48px;
    border-radius: 12px;
    gap: 7px;
  }
  .hero-actions > .button > .icon {
    width: 18px;
    height: 18px;
  }
  .hero-note {
    font-size: 10px;
    margin-top: 15px;
  }
  .hero-scene {
    height: 328px;
    margin-top: 16px;
    transform: none;
    width: 350px;
  }
  .scene-sun {
    width: 245px;
    height: 245px;
    left: 53px;
    top: 49px;
  }
  .scene-orbit {
    width: 320px;
    height: 266px;
    left: 16px;
    top: 38px;
    border-width: 1.5px;
  }
  .mascot-button {
    width: 230px;
    height: 230px;
    left: 73px;
    top: 76px;
  }
  .lily-pad {
    width: 222px;
    height: 38px;
    left: 82px;
    top: 266px;
  }
  .hero-word {
    left: -1px;
    top: 50px;
    width: 127px;
    padding: 10px 11px;
    border-radius: 13px;
    box-shadow: 0 4px 0 #e2eaca;
  }
  .word-chip {
    font-size: 7px;
  }
  .hero-word strong {
    font-size: 20px;
    margin: 5px 0;
  }
  .hero-word > span:last-of-type {
    font-size: 8px;
  }
  .hero-word > .icon {
    width: 13px;
    height: 13px;
    right: 9px;
    top: 11px;
  }
  .hero-speech {
    right: 0;
    top: 32px;
    padding: 10px 13px;
    font-size: 10px;
    border-radius: 14px;
  }
  .hero-speech span {
    width: 12px;
    height: 12px;
    bottom: -7px;
  }
  .hero-course {
    right: -5px;
    top: 234px;
    width: 184px;
    gap: 7px;
    padding: 10px;
    border-radius: 13px;
  }
  .hero-course strong {
    font-size: 9px;
  }
  .hero-course div > span {
    font-size: 7px;
  }
  .scene-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
  }
  .scene-icon > .icon {
    width: 17px;
    height: 17px;
  }
  .mini-check {
    width: 16px;
    height: 16px;
  }
  .mini-check > .icon {
    width: 11px;
    height: 11px;
  }
  .book-one {
    width: 60px;
    height: 81px;
    bottom: 22px;
    left: 24px;
    padding: 9px;
    border-radius: 6px;
  }
  .book-one > span {
    font-size: 14px;
    margin-top: 9px;
  }
  .book-one > .icon {
    width: 13px;
    height: 13px;
    top: 6px;
    right: 6px;
  }
  .book-one > b {
    font-size: 5px;
    bottom: 5px;
  }
  .book-two {
    width: 48px;
    height: 61px;
    bottom: 12px;
    left: 75px;
    padding: 6px;
    border-radius: 6px;
  }
  .book-two > span {
    font-size: 6px;
  }
  .book-two > .icon {
    width: 23px;
    height: 23px;
    margin-top: 6px;
  }
  .leaf-one {
    right: 2px;
    top: 162px;
    width: 27px;
    height: 13px;
  }
  .leaf-two {
    left: 44px;
    top: 161px;
    width: 19px;
    height: 12px;
  }
  .mascot-hint {
    font-size: 8px;
    right: 62px;
    bottom: -3px;
  }
  .feature-strip {
    gap: 8px 12px;
    padding: 18px 0;
  }
  .feature-strip > a {
    padding-left: 0;
    min-height: 64px;
    gap: 9px;
  }
  .feature-icon {
    width: 41px;
    height: 41px;
    border-radius: 12px;
  }
  .feature-icon > .icon {
    width: 22px;
    height: 22px;
  }
  .feature-strip strong {
    font-size: 11px;
  }
  .feature-strip small {
    font-size: 9px;
    margin-top: 5px;
  }
  .section-space {
    padding: 60px 0;
  }
  .eyebrow {
    font-size: 11px;
    letter-spacing: 0.5px;
    margin-bottom: 15px;
  }
  .section-heading h2,
  .feature-copy h2 {
    font-size: 29px;
    letter-spacing: -0.7px;
  }
  .section-heading > p:last-child {
    font-size: 12px;
  }
  .learning-path .section-heading {
    margin-bottom: 27px;
  }
  .journey-layout {
    display: flex;
    flex-direction: column;
    gap: 25px;
  }
  .journey-story {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    order: 2;
  }
  .journey-step {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    min-height: 168px;
    margin: 0;
    padding: 16px 13px;
    border: 2px solid #e6eddf;
    border-radius: 16px;
  }
  .journey-step strong {
    font-size: 12px;
  }
  .journey-step small {
    font-size: 9px;
    margin-top: 6px;
  }
  .step-number {
    width: 29px;
    height: 29px;
    font-size: 10px;
  }
  .journey-stage {
    position: relative;
    top: auto;
    width: 100%;
    order: 1;
    padding: 22px 20px 17px;
  }
  .journey-stage h3 {
    font-size: 20px;
  }
  .path-map {
    height: 252px;
    max-width: 340px;
    margin: 8px auto 0;
  }
  .path-node {
    width: 74px;
    height: 74px;
    border-radius: 19px;
  }
  .journey-frog {
    width: 127px;
    left: 34%;
    top: 78px;
  }
  .node-0 {
    left: 3%;
    top: 8px;
  }
  .node-1 {
    right: 2%;
    top: 26px;
  }
  .node-2 {
    right: 2%;
    bottom: 12px;
  }
  .node-3 {
    left: 1%;
    bottom: 12px;
  }
  .journey-stage > #journey-copy {
    font-size: 11px;
    min-height: 39px;
  }
  .scroll-cue {
    margin-top: 12px;
    font-size: 9px;
  }
  .split {
    gap: 38px;
  }
  .feature-intro {
    font-size: 12px;
  }
  .check-list {
    margin-top: 20px;
  }
  .check-list li {
    font-size: 11px;
    gap: 10px;
    margin-top: 15px;
  }
  .check-list strong {
    font-size: 12px;
  }
  .check-list li > .icon {
    width: 18px;
    height: 18px;
  }
  .lesson-facts {
    gap: 27px;
    margin-top: 27px;
  }
  .lesson-facts b {
    font-size: 25px;
  }
  .lesson-facts > span {
    font-size: 10px;
  }
  .fine-print {
    font-size: 9px;
  }
  .planner-wrap {
    padding: 0 20px 35px 0;
  }
  .planner-top-label {
    margin-bottom: 12px;
  }
  .planner-top-label > .icon {
    width: 29px;
    height: 29px;
  }
  .tag {
    font-size: 10px;
    padding: 7px 12px;
  }
  .week-planner,
  .word-demo,
  .exam-demo {
    padding: 19px;
    border-radius: 21px;
  }
  .demo-top {
    font-size: 12px;
  }
  .demo-label {
    font-size: 8px;
    padding: 3px 5px;
  }
  .week-days {
    gap: 5px;
    margin: 21px 0;
  }
  .week-days > button {
    height: 35px;
    border-radius: 10px;
    font-size: 11px;
  }
  .schedule-heading h3 {
    font-size: 15px;
  }
  .schedule-heading p {
    font-size: 10px;
  }
  .time-slots > button {
    font-size: 13px;
    padding: 11px 12px;
  }
  .time-slots > button:after {
    font-size: 9px;
  }
  .demo-feedback {
    font-size: 10px;
    margin-top: 12px;
  }
  .week-planner .button {
    font-size: 12px;
    min-height: 47px;
    padding: 12px 16px;
  }
  .demo-note {
    font-size: 8px;
  }
  .planner-frog {
    right: -3px;
    bottom: 0;
    width: 108px;
  }
  .word-scene {
    padding: 10px 21px 55px 0;
  }
  .word-demo {
    transform: rotate(-1deg);
  }
  .word-doodle {
    font-size: 50px;
    right: -1px;
    top: -24px;
  }
  .book-tabs {
    gap: 6px;
    margin: 17px 0;
  }
  .book-tabs > button {
    font-size: 9px;
    padding: 7px 8px;
  }
  .word-card {
    height: 241px;
  }
  .word-front strong {
    font-size: 32px;
  }
  .word-controls {
    gap: 9px;
  }
  .word-controls .button {
    font-size: 11px;
    min-height: 39px;
    padding: 9px 11px;
  }
  .word-frog {
    width: 127px;
    right: -1px;
    bottom: -7px;
  }
  .word-demo .demo-feedback {
    padding-right: 30px;
    font-size: 9px;
  }
  .quiz-options > button {
    font-size: 10px;
  }
  .text-link {
    font-size: 13px;
    margin-top: 15px;
  }
  .three-levels {
    gap: 10px;
    margin: 23px 0 17px;
  }
  .three-levels > span {
    font-size: 11px;
    gap: 7px;
  }
  .three-levels b {
    width: 28px;
    height: 28px;
    font-size: 11px;
  }
  .support-copy {
    font-size: 11px;
  }
  .chat-scene {
    padding: 20px 18px 48px 0;
  }
  .chat-header {
    padding: 17px 18px;
    gap: 10px;
  }
  .chat-header strong {
    font-size: 12px;
  }
  .chat-header small {
    font-size: 9px;
  }
  .chat-messages {
    padding: 19px;
    min-height: 149px;
  }
  .chat-message {
    font-size: 12px;
    max-width: 95%;
    padding: 12px 14px;
  }
  .chat-bottom {
    padding: 7px 19px 2px;
  }
  .reply-chip {
    font-size: 12px;
    padding: 11px 13px;
  }
  .chat-frog {
    width: 125px;
    right: -9px;
    bottom: 0;
  }
  .chat-sticker {
    font-size: 11px;
    left: 26px;
    padding: 7px 10px;
  }
  .chat-decoration {
    width: 50px;
    height: 50px;
    right: -5px;
    top: 2px;
  }
  .chat-decoration > .icon {
    width: 25px;
    height: 25px;
  }
  .exam-scene {
    padding: 8px 20px 45px 0;
  }
  .exam-sticker {
    font-size: 10px;
    left: -8px;
    top: -10px;
    padding: 7px 12px;
  }
  .exam-frog {
    right: -7px;
    width: 120px;
    bottom: -2px;
  }
  .exam-progress {
    gap: 5px;
    margin: 18px 0;
  }
  .exam-progress span {
    font-size: 8px;
    padding: 7px 2px;
  }
  .listen-track {
    padding: 10px;
    gap: 9px;
  }
  .listen-track strong {
    font-size: 10px;
  }
  .listen-track div > span {
    font-size: 8px;
  }
  .round-button {
    width: 32px;
    height: 32px;
  }
  .audio-bars {
    display: none;
  }
  .exam-demo h3 {
    font-size: 13px;
    margin-top: 19px;
  }
  .exam-options > button {
    font-size: 10px;
    padding: 9px 10px;
    min-height: 39px;
    gap: 9px;
  }
  .exam-demo .demo-feedback {
    padding-right: 32px;
    font-size: 9px;
  }
  .method-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-top: 36px;
  }
  .method-item {
    display: grid;
    grid-template-columns: 62px 1fr;
    gap: 4px 18px;
    text-align: left;
  }
  .method-icon {
    width: 57px;
    height: 57px;
    border-radius: 19px;
    grid-row: 1/3;
    margin: 0;
  }
  .method-icon > .icon {
    width: 28px;
    height: 28px;
  }
  .method-item h3 {
    font-size: 17px;
    margin: 1px 0 4px;
  }
  .method-item p {
    font-size: 11px;
  }
  .method-section .section-heading > p:last-child {
    font-size: 11px;
  }
  .progress-ribbon {
    margin-top: 42px;
    padding: 20px 75px 20px 14px;
    border-radius: 19px;
    gap: 9px;
    min-height: 94px;
  }
  .progress-ribbon > .icon {
    width: 24px;
    height: 24px;
  }
  .progress-ribbon p {
    font-size: 10px;
  }
  .ribbon-frog {
    width: 95px;
    right: -11px;
    bottom: -5px;
  }
  .faq-heading h2 {
    font-size: 28px;
  }
  .faq-frog {
    width: 101px;
    right: 2px;
    bottom: -4px;
  }
  .faq-list {
    margin-top: 18px;
  }
  .faq-list summary {
    font-size: 12px;
    gap: 15px;
    padding: 20px 0;
  }
  .faq-list summary > span {
    width: 25px;
    height: 25px;
    border-radius: 7px;
    font-size: 19px;
  }
  .faq-list details > p {
    font-size: 11px;
    padding-right: 11px;
  }
  .download-layout {
    padding: 57px 0 40px;
    gap: 5px;
  }
  .download-copy h2 {
    font-size: 32px;
  }
  .download-copy .eyebrow {
    font-size: 10px;
  }
  .download-copy > p:not(.eyebrow):not(.download-note) {
    font-size: 12px;
    margin: 17px 0 24px;
  }
  .download-actions {
    gap: 12px;
    flex-direction: column;
    align-items: flex-start;
  }
  .download-actions .button {
    font-size: 12px;
    padding: 13px 19px;
    min-height: 47px;
  }
  .download-actions .button > .icon {
    width: 20px;
    height: 20px;
  }
  .download-note {
    font-size: 9px;
    margin-top: 20px;
  }
  .download-art {
    min-height: 257px;
    margin-top: 21px;
    width: 330px;
  }
  .qr-card {
    width: 160px;
    padding: 13px;
    border-radius: 19px;
    top: 15px;
    right: 9px;
  }
  .qr-card > img,
  .qr-card > .app-contact-graphic {
    width: 130px;
    height: 130px;
  }
  .qr-card > strong {
    font-size: 10px;
    margin-top: 7px;
  }
  .qr-card > span {
    font-size: 9px;
  }
  .download-frog {
    width: 192px;
    left: -5px;
    top: 92px;
  }
  .download-orbit {
    inset: -12px -15px -16px 8px;
  }
  .site-footer {
    padding-top: 34px;
  }
  .footer-main {
    gap: 27px 20px;
    padding-bottom: 30px;
  }
  .footer-main .brand {
    font-size: 21px;
  }
  .footer-main > p {
    font-size: 10px;
  }
  .footer-main > div {
    font-size: 10px;
    gap: 10px;
  }
  .footer-main > div > strong {
    font-size: 11px;
  }
  .footer-main nav {
    font-size: 10px;
    gap: 13px;
  }
  .footer-bottom {
    font-size: 8px;
    gap: 10px;
    flex-wrap: wrap;
    padding: 18px 0;
  }
  .app-dialog {
    padding: 21px 23px 27px;
  }
  .dialog-frog {
    width: 133px;
  }
  .app-dialog h2 {
    font-size: 23px;
  }
  .app-dialog > p:not(.eyebrow):not(.demo-feedback) {
    font-size: 11px;
  }
}
@media (max-width: 360px) {
  .hero,
  .download-layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .hero-copy,
  .download-copy {
    min-width: 0;
  }
  .container {
    width: calc(100% - 32px);
  }
  .header-contact {
    font-size: 9px;
    padding: 8px;
  }
  .brand {
    font-size: 19px;
  }
  .hero h1 {
    font-size: 36px;
  }
  .hero-scene {
    transform: scale(0.82);
    transform-origin: top left;
    margin-bottom: -30px;
  }
  .hero-actions > .button {
    font-size: 11px;
    padding: 12px;
  }
  .feature-strip strong {
    font-size: 10px;
  }
  .feature-strip small {
    font-size: 8px;
  }
  .feature-strip > a {
    gap: 7px;
  }
  .feature-icon {
    width: 36px;
    height: 36px;
  }
  .download-frog {
    left: -12px;
  }
  .download-art {
    max-width: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *:before,
  *:after {
    animation: none !important;
    transition: none !important;
  }
  .hero-word {
    transform: rotate(-8deg);
  }
  .hero-course {
    transform: rotate(5deg);
  }
}

.bus-pair {
  width: 100%;
  height: auto;
  margin-top: 10px;
  border-radius: 10px;
}
.word-scene,
.chat-scene,
.exam-scene {
  isolation: isolate;
}
.listening-transcript {
  margin-top: 12px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.8;
}
.listening-transcript summary {
  cursor: pointer;
  color: #73549d;
  font-weight: 800;
}
.listening-transcript p {
  padding: 10px 12px;
  margin-top: 8px;
  border-radius: 9px;
  background: #f6f3fb;
}