@font-face {
  font-family: "Smiley Sans";
  src: url("fonts/SmileySans.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --ink: #111827;
  --muted: #667085;
  --line: #dfe3ea;
  --blue: #2563eb;
  --blue-soft: #eaf0ff;
  --blue-deep: #1749b5;
  --display: "Smiley Sans", "PingFang SC", "Microsoft YaHei UI", sans-serif;
  --sans: "PingFang SC", "Microsoft YaHei UI", "Noto Sans CJK SC", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
  --max-width: 1180px;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0c111b;
  --surface: #131a27;
  --ink: #f4f7fb;
  --muted: #98a2b3;
  --line: #293242;
  --blue: #5b8cff;
  --blue-soft: #18284d;
  --blue-deep: #82a6ff;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

button {
  color: inherit;
  font: inherit;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  background: var(--blue);
  color: #fff;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  padding: 0 clamp(22px, 5vw, 72px);
  border-bottom: 1px solid transparent;
  transition:
    background 180ms ease,
    border-color 180ms ease,
    backdrop-filter 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
}

.brand {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 20px;
  font-weight: 600;
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 5px var(--blue-soft);
}

.desktop-nav {
  display: flex;
  gap: 38px;
}

.desktop-nav a {
  position: relative;
  color: var(--muted);
  font-size: 20px;
  transition: color 160ms ease;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
  color: var(--blue);
}

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

.theme-toggle,
.menu-toggle {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  cursor: pointer;
}

.theme-toggle svg {
  width: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.6;
}

.moon-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: none;
}

[data-theme="dark"] .moon-icon {
  display: block;
}

.menu-toggle,
.mobile-nav {
  display: none;
}

.hero {
  position: relative;
  display: flex;
  min-height: 100svh;
  align-items: center;
  overflow: hidden;
  padding: 140px clamp(24px, 8vw, 128px) 90px;
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  content: "";
  opacity: 0.34;
  mask-image: linear-gradient(to right, #000, transparent 76%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(820px, 70%);
}

.eyebrow,
.section-index {
  margin: 0;
  color: var(--blue);
  font: 500 20px/1.5 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 32px 0 0;
  font-family: var(--display);
  font-size: clamp(62px, 7vw, 100px);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.hero h1 span {
  color: var(--blue);
}

.hero-intro {
  max-width: 520px;
  margin: 38px 0 0;
  color: var(--muted);
  font-size: 20px;
  font-weight: 300;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 38px;
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 6px;
  background: var(--blue);
  color: #fff;
  font-size: 20px;
  font-weight: 500;
  transition:
    background 160ms ease,
    transform 160ms ease;
}

.button:hover {
  background: var(--blue-deep);
  transform: translateY(-2px);
}

.text-link {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 20px;
}

.text-link span {
  display: inline-block;
  margin-left: 6px;
  color: var(--blue);
  transition: transform 160ms ease;
}

.text-link:hover span {
  transform: translate(3px, -3px);
}

.hero-visual {
  position: absolute;
  top: 50%;
  right: clamp(15px, 6vw, 90px);
  width: min(36vw, 520px);
  aspect-ratio: 1;
  transform: translateY(-50%);
}

.visual-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid color-mix(in srgb, var(--blue) 45%, transparent);
  border-radius: 50%;
}

.ring-one {
  width: 92%;
  height: 42%;
  transform: translate(-50%, -50%) rotate(-16deg);
}

.ring-two {
  width: 42%;
  height: 92%;
  transform: translate(-50%, -50%) rotate(24deg);
}

.visual-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--blue);
  box-shadow:
    0 0 0 20px var(--blue-soft),
    0 24px 55px color-mix(in srgb, var(--blue) 35%, transparent);
  transform: translate(-50%, -50%);
}

.visual-dot {
  position: absolute;
  width: 13px;
  height: 13px;
  border: 3px solid var(--bg);
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue);
}

.dot-one {
  top: 30%;
  left: 4%;
}

.dot-two {
  right: 9%;
  bottom: 24%;
}

.section {
  padding: 130px clamp(24px, 8vw, 128px);
}

.about-section {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.about-section > .section-index,
.about-grid,
.focus-heading,
.focus-list {
  max-width: var(--max-width);
  margin-right: auto;
  margin-left: auto;
}

.about-grid {
  display: grid;
  margin-top: 58px;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(60px, 10vw, 150px);
}

.about-grid h2,
.focus-heading h2,
.contact-section h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(46px, 5.5vw, 74px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.about-copy {
  padding-top: 6px;
}

.about-copy > p:first-child {
  margin: 0;
  color: var(--muted);
  font-size: 20px;
  font-weight: 300;
  line-height: 2;
}

.quote {
  margin: 42px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  color: var(--blue);
  font-size: 20px;
}

.focus-section {
  background: var(--bg);
}

.focus-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 50px;
}

.focus-heading h2 {
  margin-top: 30px;
}

.focus-intro {
  max-width: 340px;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 20px;
}

.focus-list {
  margin-top: 70px;
  border-top: 1px solid var(--line);
}

.focus-item {
  display: grid;
  min-height: 155px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 110px 1fr auto;
  gap: 30px;
  transition:
    padding 180ms ease,
    background 180ms ease;
}

.focus-item:hover {
  padding: 0 24px;
  background: var(--surface);
}

.focus-number {
  color: var(--blue);
  font: 500 20px/1 var(--mono);
}

.focus-item h3 {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: 28px;
  font-weight: 400;
}

.focus-item p {
  margin: 0;
  color: var(--muted);
  font: 400 20px/1.5 var(--mono);
  letter-spacing: 0.04em;
}

.focus-tag {
  padding: 8px 12px;
  border-radius: 30px;
  background: var(--blue-soft);
  color: var(--blue);
  font: 500 20px/1 var(--mono);
}

.contact-section {
  padding: 130px 24px;
  background: var(--blue);
  color: #fff;
  text-align: center;
}

.contact-section .section-index {
  color: rgba(255, 255, 255, 0.68);
}

.contact-section h2 {
  margin-top: 34px;
}

.contact-section > p:not(.section-index) {
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 20px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  margin-top: 46px;
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.7);
  font: 500 clamp(20px, 2.2vw, 26px)/1 var(--mono);
}

.contact-link span {
  transition: transform 160ms ease;
}

.contact-link:hover span {
  transform: translate(4px, -4px);
}

.site-footer {
  display: flex;
  min-height: 150px;
  align-items: center;
  justify-content: space-between;
  padding: 35px clamp(24px, 5vw, 72px);
  background: var(--surface);
  color: var(--muted);
  font: 400 24px/1.5 var(--sans);
}

.site-footer .brand {
  color: var(--ink);
  font-family: var(--sans);
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 24px;
}

.icp-link {
  transition: color 160ms ease;
}

.icp-link:hover {
  color: var(--blue);
}

.ga-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 160ms ease;
}

.ga-link:hover {
  color: var(--blue);
}

.ga-icon {
  flex-shrink: 0;
}

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 600ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 820px) {
  .desktop-nav {
    display: none;
  }

  .menu-toggle {
    display: grid;
    gap: 5px;
  }

  .menu-toggle span {
    width: 16px;
    height: 1px;
    background: currentColor;
    transition: transform 160ms ease;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(3px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-3px) rotate(-45deg);
  }

  .mobile-nav {
    position: fixed;
    z-index: 45;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    background: var(--bg);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition:
      opacity 180ms ease,
      transform 180ms ease;
  }

  .mobile-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .mobile-nav a {
    font-size: 32px;
    font-weight: 500;
  }

  .hero-copy {
    width: 80%;
  }

  .hero-visual {
    right: -18vw;
    width: 58vw;
    opacity: 0.7;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 45px;
  }
}

@media (max-width: 560px) {
  .site-header {
    height: 70px;
    padding: 0 18px;
  }

  .theme-toggle,
  .menu-toggle {
    width: 39px;
    height: 39px;
  }

  .hero {
    min-height: 760px;
    align-items: flex-start;
    padding: 145px 22px 80px;
  }

  .hero-copy {
    width: 100%;
  }

  .hero h1 {
    margin-top: 26px;
    font-size: clamp(46px, 12vw, 56px);
    line-height: 1.12;
  }

  .hero-intro {
    max-width: 330px;
    margin-top: 30px;
    font-size: 20px;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
    margin-top: 30px;
  }

  .hero-visual {
    top: auto;
    right: -22%;
    bottom: -2%;
    width: 88vw;
    transform: none;
    opacity: 0.5;
  }

  .section {
    padding: 90px 22px;
  }

  .about-grid {
    margin-top: 42px;
  }

  .about-grid h2,
  .focus-heading h2,
  .contact-section h2 {
    font-size: 44px;
  }

  .focus-heading {
    display: block;
  }

  .focus-intro {
    margin-top: 24px;
  }

  .focus-list {
    margin-top: 48px;
  }

  .focus-item {
    min-height: 138px;
    grid-template-columns: 45px 1fr auto;
    gap: 12px;
  }

  .focus-item:hover {
    padding: 0;
    background: transparent;
  }

  .focus-item h3 {
    font-size: 24px;
  }

  .focus-tag {
    padding: 7px 9px;
  }

  .contact-section {
    padding: 105px 22px;
  }

  .contact-section h2 {
    margin-top: 28px;
  }

  .contact-link {
    font-size: 20px;
  }

  .site-footer {
    min-height: 130px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 22px;
    padding: 30px 22px;
  }

  .footer-meta {
    width: 100%;
    justify-content: space-between;
    gap: 14px;
  }
}

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

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