:root {
  --red: #ef3529;
  --red-dark: #d72b22;
  --yellow: #ffc928;
  --orange: #ff7f22;
  --blue: #2bb8df;
  --deep-blue: #2368d5;
  --green: #38b56b;
  --purple: #a66be8;
  --ink: #20232a;
  --muted: #6d6f78;
  --paper: #fffdf7;
  --white: #ffffff;
  --shadow: 0 16px 38px rgba(35, 31, 28, 0.13);
  --radius: 24px;
  --content: 1120px;

  --font-small: 0.78rem;
  --font-body: 16px;
  --font-body-lg: clamp(1rem, 1.2vw, 1.12rem);
  --font-card-title: clamp(1.18rem, 1.5vw, 1.38rem);
  --font-section-title: clamp(2rem, 3.35vw, 3.3rem);
  --font-hero: clamp(3rem, 5vw, 4.75rem);
  --space-section: clamp(72px, 8vw, 96px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-color: rgba(32, 35, 42, 0.22) transparent;
  scrollbar-width: thin;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: rgba(32, 35, 42, 0.2);
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(32, 35, 42, 0.3);
  background-clip: padding-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: ui-rounded, "Nunito", "Avenir Next", "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: var(--font-body);
  line-height: 1.6;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(20px, 5vw, 64px);
  color: var(--white);
  background: rgba(239, 53, 41, 0.96);
  backdrop-filter: blur(16px);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: var(--red);
  background: var(--white);
  border-radius: 50%;
  font-weight: 1000;
  box-shadow: inset -3px -3px 0 rgba(255, 201, 40, 0.8);
}

.brand-logo {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 6px 14px rgba(104, 30, 22, 0.14);
}

.brand-name {
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 3vw, 34px);
  font-size: 0.88rem;
  font-weight: 800;
}

.nav-links a {
  opacity: 0.95;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-toggle {
  min-width: 48px;
  min-height: 36px;
  border: 2px solid rgba(255, 255, 255, 0.42);
  border-radius: 999px;
  color: var(--white);
  background: transparent;
  font-weight: 900;
  cursor: pointer;
}

.pill-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  color: var(--red);
  background: var(--white);
  font-size: 0.92rem;
  font-weight: 900;
  box-shadow: 0 10px 24px rgba(104, 30, 22, 0.16);
  white-space: nowrap;
}

.red-button {
  color: var(--white);
  background: var(--red);
}

.section-red {
  position: relative;
  color: var(--white);
  background: var(--red);
  overflow: hidden;
}

.hero {
  min-height: 660px;
  padding: 104px clamp(20px, 5vw, 64px) 78px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  align-items: center;
  gap: 52px;
}

.hero-copy h1 {
  max-width: 560px;
  margin: 0 0 18px;
  font-size: var(--font-hero);
  line-height: 1.02;
  letter-spacing: 0;
  white-space: pre-line;
}

.hero-body {
  max-width: 520px;
  margin: 0 0 26px;
  color: rgba(255, 255, 255, 0.92);
  font-size: var(--font-body-lg);
  line-height: 1.58;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: var(--font-small);
  font-weight: 1000;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow.red {
  color: var(--red);
}

.hero-visual {
  position: relative;
  overflow: hidden;
  border-radius: 108px;
  transform: rotate(-1deg);
  background: var(--yellow);
  box-shadow: 0 26px 66px rgba(102, 20, 13, 0.28);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.play-button {
  position: absolute;
  inset: 50% auto auto 50%;
  width: 74px;
  height: 74px;
  border: 0;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

.play-button::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 54%;
  width: 0;
  height: 0;
  transform: translate(-50%, -50%);
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  border-left: 20px solid var(--red);
}

.hero-bg-shapes span {
  position: absolute;
  display: block;
}

.planet {
  border-radius: 50%;
  opacity: 0.85;
}

.planet-one {
  left: -28px;
  top: 170px;
  width: 92px;
  height: 92px;
  background: var(--orange);
  box-shadow: inset 20px 0 0 rgba(255, 201, 40, 0.72);
}

.planet-two {
  right: -35px;
  top: 78px;
  width: 118px;
  height: 118px;
  background: var(--yellow);
  box-shadow: inset -32px 8px 0 rgba(255, 127, 34, 0.55);
}

.spark {
  width: 16px;
  height: 16px;
  background: var(--yellow);
  clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
}

.spark-one {
  left: 9vw;
  top: 390px;
}

.spark-two {
  right: 13vw;
  top: 420px;
}

.wave {
  position: absolute;
  left: 0;
  right: 0;
  pointer-events: none;
}

.wave-white {
  bottom: -1px;
  height: 96px;
  background: var(--paper);
  clip-path: polygon(0 55%, 12% 72%, 25% 56%, 40% 70%, 57% 42%, 72% 62%, 86% 45%, 100% 58%, 100% 100%, 0 100%);
}

.section {
  padding: var(--space-section) clamp(20px, 5vw, 64px);
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 38px;
  text-align: center;
}

.section-heading.narrow {
  max-width: 690px;
  margin-bottom: 22px;
}

.section-heading h2,
.kit-copy h2,
.parents-copy h2 {
  margin: 0 0 14px;
  font-size: var(--font-section-title);
  line-height: 1.12;
  letter-spacing: 0;
  white-space: pre-line;
}

.section-heading p,
.kit-copy p,
.parents-copy p {
  margin: 0;
  color: var(--muted);
  font-size: var(--font-body-lg);
  line-height: 1.62;
  font-weight: 650;
}

.intro {
  padding-top: 76px;
  padding-bottom: 54px;
  text-align: center;
}

.intro h2 {
  color: var(--red);
}

.intro-chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.intro-chips span {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  color: var(--red);
  background: #fff0df;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 900;
}

.how-section {
  padding-top: 54px;
}

.how-grid {
  max-width: var(--content);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.how-card {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.how-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.how-card h3 {
  margin: 18px 18px 4px;
  color: var(--red);
  font-size: clamp(1.7rem, 2.4vw, 2rem);
  line-height: 1.08;
}

.how-card p {
  min-height: 52px;
  margin: 0;
  padding: 0 18px 22px;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.5;
  font-weight: 750;
}

.step-label {
  position: absolute;
  top: 14px;
  left: 14px;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  color: var(--white);
  background: var(--red);
  border: 4px solid var(--white);
  border-radius: 50%;
  font-weight: 1000;
}

.section-yellow {
  position: relative;
  background: var(--yellow);
}

.wave-yellow-top {
  top: -1px;
  height: 78px;
  background: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% 46%, 86% 62%, 70% 38%, 52% 56%, 35% 42%, 16% 65%, 0 45%);
}

.kit {
  padding: 112px clamp(20px, 5vw, 64px) 92px;
}

.kit-inner {
  max-width: var(--content);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: 48px;
}

.kit-visual {
  overflow: hidden;
  border-radius: 32px;
  background: var(--white);
  box-shadow: 0 24px 48px rgba(145, 99, 0, 0.2);
  transform: rotate(-1deg);
}

.kit-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.kit-copy .eyebrow,
.kit-copy h2 {
  color: var(--red);
}

.kit-copy p {
  color: rgba(32, 35, 42, 0.75);
}

.kit-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.kit-item {
  display: grid;
  grid-template-columns: minmax(120px, 0.42fr) 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.68);
  border-radius: 16px;
}

.kit-item strong {
  color: var(--red);
  font-weight: 1000;
}

.kit-item span {
  color: rgba(32, 35, 42, 0.76);
  font-size: 0.95rem;
  line-height: 1.5;
  font-weight: 720;
}

.values {
  background: var(--paper);
}

.value-grid {
  max-width: var(--content);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.value-card {
  min-height: 220px;
  padding: 24px;
  border-radius: 24px;
  color: var(--white);
  box-shadow: var(--shadow);
}

.value-card-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.value-card h3 {
  margin: 0;
  font-size: var(--font-card-title);
  line-height: 1.22;
}

.value-card p {
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.98rem;
  line-height: 1.55;
  font-weight: 700;
}

.value-card.blue {
  background: var(--blue);
}

.value-card.orange {
  background: var(--orange);
}

.value-card.green {
  background: var(--green);
}

.value-card.purple {
  background: var(--purple);
}

.value-card.red-card {
  background: var(--red);
}

.value-card.yellow-card {
  color: var(--white);
  background: var(--yellow);
}

.value-card.yellow-card p {
  color: rgba(255, 255, 255, 0.92);
}

.value-icon {
  display: block;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background: var(--white);
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
}

.screen-icon {
  -webkit-mask-image: url("./assets/icons/减少被动刷屏.svg");
  mask-image: url("./assets/icons/减少被动刷屏.svg");
}

.voice-icon {
  -webkit-mask-image: url("./assets/icons/培养表达能力.svg");
  mask-image: url("./assets/icons/培养表达能力.svg");
}

.rule-icon {
  -webkit-mask-image: url("./assets/icons/练习逻辑和规则.svg");
  mask-image: url("./assets/icons/练习逻辑和规则.svg");
}

.loop-icon {
  -webkit-mask-image: url("./assets/icons/创作闭环.svg");
  mask-image: url("./assets/icons/创作闭环.svg");
}

.share-icon {
  -webkit-mask-image: url("./assets/icons/学会分享和交流.svg");
  mask-image: url("./assets/icons/学会分享和交流.svg");
}

.parent-icon {
  -webkit-mask-image: url("./assets/icons/家长陪伴.svg");
  mask-image: url("./assets/icons/家长陪伴.svg");
}

.compact-red {
  padding: 76px clamp(20px, 5vw, 64px);
}

.parents-inner {
  max-width: var(--content);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 42px;
  align-items: center;
}

.parents-copy p {
  color: rgba(255, 255, 255, 0.9);
}

.guide-list {
  display: grid;
  gap: 14px;
}

.guide-list article {
  padding: 22px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.guide-list h3 {
  margin: 0 0 8px;
  font-size: var(--font-card-title);
  line-height: 1.25;
}

.guide-list p {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 0.98rem;
  line-height: 1.56;
  font-weight: 700;
}

.faq-preview {
  background: var(--paper);
}

.faq-preview-card {
  max-width: 940px;
  margin: 0 auto;
  padding: clamp(30px, 5vw, 56px);
  text-align: center;
  border-radius: 32px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.faq-preview-card h2 {
  max-width: 720px;
  margin: 0 auto 12px;
  color: var(--ink);
  font-size: var(--font-section-title);
  line-height: 1.12;
}

.faq-preview-card p:not(.eyebrow) {
  max-width: 680px;
  margin: 0 auto 24px;
  color: var(--muted);
  font-size: var(--font-body-lg);
  line-height: 1.62;
  font-weight: 650;
}

.faq {
  background: var(--paper);
}

.faq-hero {
  padding: 88px clamp(20px, 5vw, 64px) 120px;
}

.faq-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.faq-hero h1 {
  margin: 0 0 16px;
  font-size: var(--font-hero);
  line-height: 1.04;
}

.faq-hero p:not(.eyebrow) {
  max-width: 740px;
  margin: 0 auto 26px;
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-body-lg);
  line-height: 1.62;
  font-weight: 700;
}

.faq-page {
  background: var(--paper);
}

.faq-layout {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  gap: 46px;
}

.faq-category h2 {
  margin: 0 0 18px;
  color: var(--red);
  font-size: clamp(1.55rem, 2.4vw, 2.1rem);
  line-height: 1.18;
}

.faq-grid {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

details {
  overflow: hidden;
  border-radius: 18px;
  background: var(--white);
  box-shadow: 0 12px 28px rgba(35, 31, 28, 0.08);
}

summary {
  position: relative;
  padding: 20px 58px 20px 22px;
  color: var(--ink);
  font-size: clamp(1rem, 1.2vw, 1.08rem);
  line-height: 1.42;
  font-weight: 900;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 22px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  transform: translateY(-50%);
  color: var(--white);
  background: var(--red);
  display: grid;
  place-items: center;
  font-weight: 1000;
}

details[open] summary::after {
  content: "-";
}

details p {
  margin: 0;
  padding: 0 22px 22px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
  font-weight: 700;
}

.site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 38px 20px 44px;
  color: rgba(255, 255, 255, 0.8);
  background: #2f2f31;
  text-align: center;
}

.site-footer .brand-mark {
  background: var(--red);
  color: var(--white);
  box-shadow: inset -3px -3px 0 var(--yellow);
}

.site-footer .brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  box-shadow: none;
}

.site-footer p {
  margin: 0;
  font-weight: 700;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 24px;
  font-size: 0.9rem;
}

.footer-legal {
  max-width: 920px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.78rem;
  line-height: 1.45;
}

.footer-legal a,
.footer-icp {
  transition: color 160ms ease;
}

.footer-legal a:hover,
.footer-icp:hover {
  color: rgba(255, 255, 255, 0.92);
}

.footer-icp {
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.78rem;
  line-height: 1.4;
}

@media (max-width: 980px) {
  .site-header {
    gap: 14px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 76px;
  }

  .hero-inner,
  .kit-inner,
  .parents-inner {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-copy h1,
  .hero-body {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-visual {
    max-width: 720px;
    margin: 0 auto;
    border-radius: 58px;
  }

  .how-grid,
  .value-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  :root {
    --font-body: 15px;
    --font-body-lg: 1rem;
    --font-card-title: clamp(1.1rem, 5vw, 1.28rem);
    --font-section-title: clamp(1.75rem, 7.5vw, 2.35rem);
    --font-hero: clamp(2.15rem, 10.2vw, 3rem);
    --space-section: 56px;
  }

  .site-header {
    padding: 12px 16px;
  }

  .brand-name {
    display: none;
  }

  .hero {
    padding: 50px 18px 84px;
  }

  .hero-copy h1 {
    max-width: 340px;
  }

  .hero-body {
    max-width: 330px;
  }

  .hero-visual {
    border-radius: 34px;
  }

  .play-button {
    width: 58px;
    height: 58px;
  }

  .play-button::before {
    border-top-width: 11px;
    border-bottom-width: 11px;
    border-left-width: 17px;
  }

  .wave-white {
    height: 74px;
  }

  .section {
    padding: var(--space-section) 18px;
  }

  .section-heading {
    margin-bottom: 28px;
  }

  .intro {
    padding-top: 54px;
    padding-bottom: 42px;
  }

  .how-grid,
  .value-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .how-card h3 {
    font-size: 1.72rem;
  }

  .how-card p {
    min-height: auto;
    font-size: 0.95rem;
  }

  .kit {
    padding: 92px 18px 62px;
  }

  .kit-inner {
    gap: 30px;
  }

  .kit-visual {
    border-radius: 26px;
  }

  .kit-item {
    grid-template-columns: 1fr;
    gap: 5px;
    padding: 14px;
  }

  .value-card {
    min-height: auto;
    padding: 22px;
  }

  .compact-red {
    padding: 56px 18px;
  }

  .guide-list article {
    padding: 18px;
  }

  .faq-preview-card {
    padding: 28px 20px;
    border-radius: 26px;
  }

  .faq-hero {
    padding: 54px 18px 94px;
  }

  .faq-layout {
    gap: 34px;
  }

  summary {
    padding: 18px 52px 18px 18px;
  }

  summary::after {
    right: 18px;
  }

  details p {
    padding: 0 18px 20px;
    font-size: 0.96rem;
  }

}