:root {
  --yellow: #ffe600;
  --yellow-deep: #f5d400;
  --blue: #2b4eff;
  --blue-deep: #1b37d6;
  --ink: #111111;
  --paper: #fff9e6;
  --white: #ffffff;
  --border: 3px solid var(--ink);
  --shadow: 6px 6px 0 var(--ink);
  --shadow-lg: 10px 10px 0 var(--ink);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei",
    "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  line-height: 1.65;
  background-color: var(--paper);
  background-image: radial-gradient(rgba(17, 17, 17, 0.14) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
  overflow-x: hidden;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

mark {
  background: var(--yellow);
  color: var(--ink);
  padding: 0 0.12em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

::selection {
  background: var(--blue);
  color: var(--yellow);
}

:focus-visible {
  outline: 3px dashed var(--blue);
  outline-offset: 3px;
}

.wrap {
  width: min(1120px, 92%);
  margin-inline: auto;
}

.section {
  padding: clamp(52px, 8vw, 96px) 0;
  scroll-margin-top: 96px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 10px 18px;
  font-weight: 800;
  background: var(--yellow);
  border: var(--border);
}

.skip-link:focus {
  left: 12px;
  top: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  font-weight: 800;
  font-size: 1rem;
  text-align: center;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.btn:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0 var(--ink);
}

.btn--blue {
  background: var(--blue);
  color: var(--white);
}

.btn--blue:hover {
  background: var(--blue-deep);
}

.btn--yellow {
  background: var(--yellow);
}

.btn--yellow:hover {
  background: var(--yellow-deep);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
  border-bottom: var(--border);
  transition: box-shadow 0.2s ease;
}

.nav.is-scrolled {
  box-shadow: 0 5px 0 var(--ink);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  background: var(--yellow);
  border: var(--border);
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.nav__logo:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav__link {
  padding: 8px 14px;
  font-weight: 700;
  border: 3px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.nav__link:hover {
  background: var(--yellow);
  border-color: var(--ink);
}

.nav__link.is-active {
  background: var(--blue);
  border-color: var(--ink);
  color: var(--white);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  font-weight: 800;
  color: var(--white);
  background: var(--blue);
  border: var(--border);
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.nav__cta:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 46px;
  height: 46px;
  padding: 10px;
  background: var(--yellow);
  border: var(--border);
  box-shadow: 4px 4px 0 var(--ink);
}

.nav__toggle span {
  display: block;
  height: 4px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav.is-open .nav__toggle span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav.is-open .nav__toggle span:nth-child(2) {
  opacity: 0;
}

.nav.is-open .nav__toggle span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.hero {
  position: relative;
  overflow: hidden;
  background: var(--yellow);
  border-bottom: var(--border);
}

.hero__deco {
  position: absolute;
  z-index: 0;
}

.hero__deco--circle {
  top: -100px;
  right: -80px;
  width: clamp(180px, 26vw, 300px);
  aspect-ratio: 1;
  background: var(--blue);
  border: var(--border);
  border-radius: 50%;
}

.hero__deco--square {
  bottom: -46px;
  left: -46px;
  width: clamp(80px, 12vw, 130px);
  aspect-ratio: 1;
  background: var(--white);
  border: var(--border);
  transform: rotate(18deg);
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: clamp(24px, 5vw, 56px);
  padding: clamp(48px, 8vw, 100px) 0;
}

.hero__hello {
  display: inline-block;
  margin-bottom: 22px;
  padding: 8px 18px;
  font-weight: 800;
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  transform: rotate(-2deg);
}

.wave {
  display: inline-block;
  transform-origin: 70% 70%;
  animation: wave 2.2s ease-in-out infinite;
}

.hero__title {
  margin-bottom: 16px;
  font-size: clamp(2.4rem, 7.5vw, 4.6rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero__name {
  display: inline-block;
  margin-left: 0.12em;
  padding: 0 0.18em;
  color: var(--yellow);
  background: var(--blue);
  border: var(--border);
  box-shadow: var(--shadow);
  transform: rotate(-1.5deg);
}

.hero__sub {
  margin-bottom: 20px;
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  font-weight: 800;
}

.hero__highlight {
  display: inline-block;
  padding: 0 0.2em;
  background: var(--white);
  border: var(--border);
  box-shadow: 4px 4px 0 var(--ink);
  transform: rotate(1deg);
}

.hero__desc {
  max-width: 52ch;
  margin-bottom: 30px;
  font-weight: 500;
  font-size: clamp(0.98rem, 2vw, 1.06rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero__side {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.hero__sun {
  padding: 0;
  border-radius: 50%;
}

.hero__sun svg {
  width: clamp(210px, 30vw, 340px);
  height: auto;
  transition: transform 0.3s ease;
}

.hero__sun:hover svg {
  transform: scale(1.05);
}

.sun__rays {
  transform-origin: 120px 120px;
  animation: sun-spin 26s linear infinite;
}

.sun__rays line {
  stroke: var(--ink);
  stroke-width: 12;
  stroke-linecap: round;
}

.sun__rays .ray--blue {
  stroke: var(--blue);
}

.hero__sun.is-fast .sun__rays {
  animation-duration: 4s;
}

.hero__sun-tip {
  padding: 6px 14px;
  font-weight: 800;
  font-size: 0.85rem;
  background: var(--white);
  border: var(--border);
  box-shadow: 3px 3px 0 var(--ink);
  transform: rotate(-2deg);
}

.marquee {
  overflow: hidden;
  padding: 14px 0;
  color: var(--yellow);
  background: var(--ink);
  border-bottom: var(--border);
}

.marquee__track {
  display: flex;
}

.marquee__group {
  display: flex;
  gap: 34px;
  padding-left: 34px;
  white-space: nowrap;
  animation: marquee 20s linear infinite;
}

.marquee__group span {
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.section__title {
  display: inline-block;
  margin-bottom: clamp(28px, 4vw, 44px);
  padding: 6px 22px;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 900;
  color: var(--white);
  background: var(--blue);
  border: var(--border);
  box-shadow: var(--shadow);
  transform: rotate(-1.5deg);
}

.section__title--yellow {
  color: var(--ink);
  background: var(--yellow);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.card {
  height: 100%;
  padding: 28px 26px;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

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

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

.card__icon {
  margin-bottom: 14px;
  font-size: 2.2rem;
  line-height: 1;
}

.card__title {
  margin-bottom: 10px;
  font-size: 1.3rem;
  font-weight: 900;
}

.card__text {
  font-size: 0.98rem;
}

.card__text + .card__text {
  margin-top: 10px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 28px;
}

.stat {
  padding: 20px;
  text-align: center;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
}

.stat__num {
  display: block;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 900;
  color: var(--blue);
}

.stat__label {
  font-weight: 700;
  font-size: 0.95rem;
}

.quote {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 9vw, 110px) 0;
  background: var(--blue);
  border-top: var(--border);
  border-bottom: var(--border);
}

.quote__card {
  position: relative;
  max-width: 900px;
  margin-inline: auto;
  padding: clamp(30px, 5vw, 56px);
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow-lg);
}

.quote__mark {
  position: absolute;
  top: -40px;
  left: 20px;
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  color: var(--yellow);
  -webkit-text-stroke: 3px var(--ink);
  text-shadow: 3px 3px 0 var(--ink);
}

.quote__text {
  margin-top: 12px;
  font-size: clamp(1.25rem, 3.4vw, 2rem);
  font-weight: 900;
  line-height: 1.55;
}

.quote__cite {
  margin-top: 22px;
  text-align: right;
  font-weight: 900;
  font-size: 1.05rem;
}

.platform {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow-lg);
}

.platform__main {
  padding: clamp(26px, 5vw, 46px);
}

.platform__tag {
  display: inline-block;
  margin-bottom: 18px;
  padding: 4px 12px;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  background: var(--yellow);
  border: var(--border);
  box-shadow: 3px 3px 0 var(--ink);
}

.platform__name {
  margin-bottom: 12px;
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
}

.platform__desc {
  max-width: 46ch;
  margin-bottom: 26px;
}

.platform__side {
  display: grid;
  place-items: center;
  padding: 30px;
  background: var(--blue);
  border-left: var(--border);
}

.platform__side svg {
  width: clamp(110px, 16vw, 170px);
}

.footer {
  padding: clamp(28px, 5vw, 42px) 0;
  color: var(--yellow);
  background: var(--ink);
  border-top: var(--border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
}

.footer__line {
  font-weight: 800;
}

.footer__note {
  font-size: 0.9rem;
  color: rgba(255, 230, 0, 0.75);
}

.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 70;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  font-size: 1.4rem;
  font-weight: 900;
  background: var(--yellow);
  border: var(--border);
  box-shadow: 4px 4px 0 var(--ink);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease,
    box-shadow 0.12s ease;
}

.to-top.is-show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes wave {
  0%,
  60%,
  100% {
    transform: rotate(0deg);
  }
  70% {
    transform: rotate(16deg);
  }
  80% {
    transform: rotate(-8deg);
  }
  90% {
    transform: rotate(12deg);
  }
}

@keyframes sun-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes marquee {
  to {
    transform: translateX(-100%);
  }
}

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
  }

  .hero__side {
    order: -1;
    justify-items: start;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .platform {
    grid-template-columns: 1fr;
  }

  .platform__side {
    border-top: var(--border);
    border-left: none;
  }
}

@media (max-width: 860px) {
  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper);
    border-bottom: var(--border);
    box-shadow: 0 8px 0 rgba(17, 17, 17, 0.18);
  }

  .nav.is-open .nav__menu {
    display: flex;
  }

  .nav__link {
    padding: 16px 4%;
    font-size: 1.05rem;
    border: none;
    border-bottom: 3px solid var(--ink);
  }

  .nav__cta {
    justify-content: center;
    margin: 16px 4%;
  }
}

@media (max-width: 560px) {
  .stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .to-top {
    right: 16px;
    bottom: 16px;
    width: 48px;
    height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }

  .sun__rays {
    animation: none !important;
  }

  .marquee__group {
    animation: none !important;
  }
}