:root {
  color-scheme: dark;
  --color-background: #00253e;
  --color-primary: #ff9119;
  --color-text: #f7f4ed;
  --color-muted: #a9bbc6;
  --color-line: rgba(247, 244, 237, 0.16);
  --page-padding: clamp(24px, 5vw, 72px);
  --content-width: 1440px;
  --title-size: clamp(40px, 8vw, 80px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--color-background);
  color: var(--color-text);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-150%);
  background: var(--color-primary);
  color: var(--color-background);
  font-weight: 700;
}

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

.site-header {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 50%;
  display: flex;
  width: min(100%, var(--content-width));
  align-items: center;
  justify-content: space-between;
  padding: 28px var(--page-padding);
  transform: translateX(-50%);
}

.site-logo {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.site-logo span,
.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-primary);
}

.site-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  transition: color 180ms ease, border-color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  border-color: var(--color-primary);
}

.hero {
  position: relative;
  isolation: isolate;
  display: flex;
  min-height: 100vh;
  min-height: 100svh;
  align-items: center;
  overflow: hidden;
  padding: 128px var(--page-padding) 72px;
}

.hero::after {
  position: absolute;
  z-index: -1;
  right: -10%;
  bottom: -30%;
  width: min(48vw, 680px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--color-primary);
  content: "";
  filter: blur(2px);
}

.hero-grid {
  position: absolute;
  z-index: -2;
  inset: 0;
  background-image:
    linear-gradient(var(--color-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line) 1px, transparent 1px);
  background-size: clamp(72px, 10vw, 160px) clamp(72px, 10vw, 160px);
  mask-image: linear-gradient(to bottom right, black, transparent 72%);
  opacity: 0.38;
}

.hero-orbit {
  position: absolute;
  z-index: -1;
  top: 12%;
  right: 9%;
  width: min(32vw, 440px);
  aspect-ratio: 1;
  border: 1px solid rgba(255, 145, 25, 0.5);
  border-radius: 50%;
}

.hero-orbit::before {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 72%;
  height: 72%;
  border: 1px solid var(--color-line);
  border-radius: inherit;
  content: "";
  transform: translate(-50%, -50%);
}

.hero-content {
  width: min(100%, var(--content-width));
  margin: 0 auto;
}

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 28px;
  color: var(--color-muted);
  font-size: clamp(0.72rem, 1vw, 0.86rem);
  font-weight: 700;
  letter-spacing: 0.16em;
}

.hero-kicker span {
  color: var(--color-primary);
}

.hero-kicker::after {
  width: 72px;
  height: 1px;
  background: var(--color-primary);
  content: "";
}

h1 {
  max-width: 1020px;
  margin: 0;
  font-size: var(--title-size);
  letter-spacing: -0.055em;
  line-height: 0.96;
}

.hero-name,
.hero-role {
  display: block;
}

.hero-name {
  margin-bottom: 0.12em;
  color: var(--color-primary);
  font-weight: 800;
}

.hero-role {
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 600;
}

.hero-intro {
  max-width: 520px;
  margin: 36px 0 0;
  color: var(--color-muted);
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  line-height: 1.75;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 40px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-primary);
  font-weight: 700;
}

.hero-link span {
  color: var(--color-primary);
  font-size: 1.3em;
  transition: transform 180ms ease;
}

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

.hero-index {
  position: absolute;
  right: var(--page-padding);
  bottom: 28px;
  margin: 0;
  color: var(--color-background);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.about {
  display: grid;
  width: min(100%, var(--content-width));
  min-height: 52vh;
  grid-template-columns: minmax(220px, 0.7fr) minmax(280px, 1.3fr);
  gap: clamp(48px, 8vw, 128px);
  align-items: start;
  margin: 0 auto;
  padding: clamp(88px, 12vw, 168px) var(--page-padding);
}

.section-heading p {
  margin: 0 0 18px;
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -0.04em;
}

.about-placeholder {
  margin: 42px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.8;
}

.error-page {
  min-height: 100vh;
  min-height: 100svh;
}

.error-main {
  position: relative;
  isolation: isolate;
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  place-items: center;
  overflow: hidden;
  padding: 128px var(--page-padding) 72px;
}

.error-main::before,
.error-main::after {
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  content: "";
}

.error-main::before {
  top: -22vw;
  right: -16vw;
  width: min(58vw, 760px);
  aspect-ratio: 1;
  border: 1px solid rgba(255, 145, 25, 0.55);
}

.error-main::after {
  right: -12%;
  bottom: -38%;
  width: min(44vw, 620px);
  aspect-ratio: 1;
  background: var(--color-primary);
}

.error-content {
  width: min(100%, 780px);
}

.error-code {
  margin: 0 0 8px;
  color: var(--color-primary);
  font-size: clamp(5rem, 20vw, 14rem);
  font-weight: 800;
  letter-spacing: -0.08em;
  line-height: 0.82;
}

.error-content h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4.5rem);
  line-height: 1.05;
}

.error-message {
  max-width: 520px;
  margin: 26px 0 0;
  color: var(--color-muted);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  line-height: 1.75;
}

.error-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 36px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-primary);
  font-weight: 700;
}

.error-link span {
  color: var(--color-primary);
  transition: transform 180ms ease;
}

.error-link:hover span,
.error-link:focus-visible span {
  transform: translateX(-4px);
}

@media (max-width: 700px) {
  .site-header {
    padding-top: 22px;
  }

  .hero {
    align-items: flex-end;
    padding-top: 112px;
    padding-bottom: 64px;
  }

  .hero::after {
    right: -36%;
    bottom: -10%;
    width: 78vw;
    opacity: 0.92;
  }

  .hero-orbit {
    top: 16%;
    right: -28%;
    width: 72vw;
  }

  .hero-kicker {
    margin-bottom: 22px;
  }

  .hero-intro {
    max-width: 78%;
    margin-top: 26px;
  }

  .hero-link {
    margin-top: 28px;
  }

  .hero-index {
    display: none;
  }

  .about {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-placeholder {
    margin-top: 0;
  }

  .error-main {
    place-items: end start;
    padding-bottom: 80px;
  }

  .error-main::before {
    top: 10%;
    right: -42%;
    width: 92vw;
  }

  .error-main::after {
    right: -38%;
    bottom: -18%;
    width: 76vw;
  }

  .error-message {
    max-width: 78%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}