:root {
  --canvas: #f7f7f2;
  --paper: #ffffff;
  --ink: #11182a;
  --muted: #737b8f;
  --line: #dcded7;
  --cobalt: #3157f6;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --page-pad: clamp(24px, 6vw, 96px);
  --content-max: 1440px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  touch-action: manipulation;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: var(--paper);
  background: var(--ink);
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
}

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

.site-header {
  width: min(100%, var(--content-max));
  height: 76px;
  margin: 0 auto;
  padding: 0 var(--page-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark,
.site-nav,
.nav-github {
  display: flex;
  align-items: center;
}

.wordmark {
  gap: 11px;
  min-height: 44px;
  font-family: "Arial Black", "PingFang SC", sans-serif;
  font-size: 13px;
  font-weight: 800;
}

.wordmark-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  border-radius: var(--radius-sm);
  font-size: 15px;
}

.site-nav {
  gap: clamp(18px, 3vw, 42px);
  color: #4d5568;
  font-size: 14px;
}

.site-nav a {
  min-height: 44px;
  display: flex;
  align-items: center;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 7px;
  left: 0;
  height: 2px;
  background: var(--cobalt);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms var(--ease-out);
}

.nav-github {
  gap: 8px;
}

.nav-github img {
  opacity: .72;
}

.hero {
  width: min(100%, var(--content-max));
  min-height: calc(100svh - 116px);
  max-height: 800px;
  margin: 0 auto;
  padding: clamp(38px, 6vh, 76px) var(--page-pad) clamp(46px, 7vh, 88px);
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(440px, 1.05fr);
  align-items: center;
  gap: clamp(36px, 7vw, 112px);
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.eyebrow,
.section-kicker {
  margin: 0;
  color: var(--cobalt);
  font-family: "Arial Black", "PingFang SC", sans-serif;
  font-size: 12px;
  font-weight: 800;
  line-height: 1;
}

.hero h1 {
  margin: 18px 0 0;
  font-family: "Arial Black", "PingFang SC", sans-serif;
  font-size: clamp(48px, 5.7vw, 82px);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: 0;
  text-wrap: balance;
}

.hero-statement {
  margin: 10px 0 0;
  min-height: 1.15em;
  font-family: "Arial Black", "PingFang SC", sans-serif;
  font-size: clamp(30px, 3.4vw, 50px);
  font-weight: 850;
  line-height: 1.15;
  color: var(--ink);
  white-space: nowrap;
}

.typing-caret {
  display: inline-block;
  width: .08em;
  height: .88em;
  margin-left: .08em;
  vertical-align: -.06em;
  background: var(--cobalt);
  animation: caret-blink 800ms steps(1, end) infinite;
}

@keyframes caret-blink {
  0%, 48% { opacity: 1; }
  49%, 100% { opacity: 0; }
}

.hero-description {
  max-width: 38em;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 1.3vw, 19px);
  line-height: 1.8;
  text-wrap: pretty;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.button {
  min-width: 154px;
  min-height: 52px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: var(--radius-md);
  font-weight: 750;
  transition: transform 140ms var(--ease-out), box-shadow 180ms var(--ease-out), background-color 180ms var(--ease-out);
}

.button-primary {
  color: var(--paper);
  background: var(--ink);
  box-shadow: 0 14px 30px rgba(17, 24, 42, .2), inset 0 0 0 1px rgba(255, 255, 255, .1);
}

.button-primary span {
  font-size: 18px;
}

.button-secondary {
  color: var(--ink);
  background: #ebece7;
}

.button:active,
.site-nav a:active,
.link-list a:active {
  transform: scale(.96);
}

.button:focus-visible,
.site-nav a:focus-visible,
.wordmark:focus-visible,
.link-list a:focus-visible {
  outline: 3px solid rgba(49, 87, 246, .32);
  outline-offset: 3px;
}

.hero-visual {
  min-width: 0;
  display: grid;
  place-items: center;
}

.hero-device {
  width: min(100%, 620px);
  height: auto;
  filter: drop-shadow(0 18px 24px rgba(17, 24, 42, .12));
  transition: transform 180ms var(--ease-out);
}

.about-section,
.links-section,
.site-footer {
  width: min(100%, var(--content-max));
  margin: 0 auto;
  padding-right: var(--page-pad);
  padding-left: var(--page-pad);
}

.about-section {
  padding-top: clamp(92px, 12vw, 170px);
  padding-bottom: clamp(110px, 14vw, 196px);
  display: grid;
  grid-template-columns: 72px minmax(300px, .9fr) minmax(320px, .8fr);
  gap: clamp(28px, 5vw, 80px);
  border-bottom: 1px solid var(--line);
}

.section-index {
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.about-heading h2,
.links-intro h2 {
  margin: 20px 0 0;
  font-family: "Arial Black", "PingFang SC", sans-serif;
  font-size: clamp(36px, 4.3vw, 62px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0;
  text-wrap: balance;
}

.about-copy {
  padding-top: 30px;
  color: #555e70;
  font-size: clamp(16px, 1.25vw, 18px);
  line-height: 1.9;
}

.about-copy p {
  margin: 0 0 24px;
  text-wrap: pretty;
}

.links-section {
  padding-top: clamp(92px, 11vw, 152px);
  padding-bottom: clamp(104px, 13vw, 180px);
  display: grid;
  grid-template-columns: minmax(290px, .72fr) minmax(440px, 1fr);
  gap: clamp(54px, 9vw, 140px);
}

.link-list {
  border-top: 1px solid var(--ink);
}

.link-list a {
  min-height: 104px;
  display: grid;
  grid-template-columns: 40px 1fr 1.35fr 36px;
  align-items: center;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  transition: transform 140ms var(--ease-out);
}

.link-number {
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.link-name {
  font-size: 23px;
  font-weight: 800;
}

.link-note {
  color: var(--muted);
  font-size: 14px;
}

.link-arrow {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  color: var(--ink);
  background: #e8e9e4;
  border-radius: 50%;
  transition: transform 180ms var(--ease-out), color 180ms var(--ease-out), background-color 180ms var(--ease-out);
}

.site-footer {
  min-height: 108px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  color: #cfd6ed;
  background: var(--ink);
  font-size: 12px;
}

.site-footer::before {
  content: "";
  width: 100vw;
  height: 100%;
  position: absolute;
  left: 50%;
  z-index: -1;
  background: var(--ink);
  transform: translateX(-50%);
}

.site-footer {
  position: relative;
  z-index: 0;
}

.site-footer p {
  margin: 0;
}

.site-footer p:nth-child(2) {
  text-align: center;
}

.site-footer p:last-child {
  text-align: right;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  animation: reveal-in 720ms var(--ease-out) forwards;
}

.reveal-delay-1 { animation-delay: 80ms; }
.reveal-delay-2 { animation-delay: 160ms; }
.reveal-delay-3 { animation-delay: 240ms; }
.reveal-delay-4 { animation-delay: 320ms; }

@keyframes reveal-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (hover: hover) {
  .hero-device:hover {
    transform: translateY(-4px);
  }

  .site-nav a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
  }

  .button-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(17, 24, 42, .26), inset 0 0 0 1px rgba(255, 255, 255, .1);
  }

  .button-secondary:hover {
    transform: translateY(-2px);
    background: #dfe1db;
  }

  .link-list a:hover .link-arrow {
    color: var(--paper);
    background: var(--cobalt);
    transform: translate(3px, -3px);
  }
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: minmax(0, .9fr) minmax(370px, 1fr);
    gap: 24px;
  }

  .about-section {
    grid-template-columns: 48px 1fr 1fr;
    gap: 28px;
  }

  .links-section {
    gap: 48px;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 64px;
  }

  .site-nav > a:first-child,
  .nav-github span {
    display: none;
  }

  .site-nav {
    gap: 18px;
  }

  .nav-github {
    width: 44px;
    justify-content: center;
  }

  .hero {
    min-height: 0;
    max-height: none;
    padding-top: 30px;
    padding-bottom: 20px;
    grid-template-columns: 1fr;
    align-content: start;
    gap: 24px;
  }

  .hero h1 {
    margin-top: 12px;
    font-size: clamp(42px, 12vw, 56px);
  }

  .hero-statement {
    margin-top: 5px;
    font-size: clamp(29px, 8.8vw, 40px);
  }

  .hero-description {
    margin-top: 16px;
    font-size: 15px;
    line-height: 1.72;
  }

  .hero-actions {
    margin-top: 20px;
  }

  .button {
    min-width: 0;
    min-height: 48px;
    padding: 0 18px;
  }

  .hero-visual {
    justify-items: center;
  }

  .hero-device {
    width: min(88vw, 340px);
  }

  .about-section,
  .links-section {
    grid-template-columns: 1fr;
  }

  .about-section {
    gap: 28px;
  }

  .section-index {
    display: none;
  }

  .about-copy {
    padding-top: 0;
  }

  .links-section {
    gap: 56px;
  }

  .link-list a {
    min-height: 92px;
    grid-template-columns: 30px 1fr 34px;
    gap: 12px;
  }

  .link-note {
    display: none;
  }

  .site-footer {
    min-height: 132px;
    grid-template-columns: 1fr auto;
    align-content: center;
  }

  .site-footer p:nth-child(2) {
    display: none;
  }
}

@media (max-width: 380px) {
  :root {
    --page-pad: 20px;
  }

  .hero-device {
    width: min(80vw, 280px);
  }
}

@media (max-width: 760px) and (max-height: 620px) {
  .hero {
    padding-top: 10px;
    padding-bottom: 12px;
    gap: 12px;
  }

  .hero h1 {
    margin-top: 8px;
    font-size: 38px;
  }

  .hero-statement {
    font-size: 27px;
  }

  .hero-description {
    margin-top: 10px;
    font-size: 14px;
    line-height: 1.62;
  }

  .hero-actions {
    margin-top: 14px;
  }

  .button {
    min-height: 44px;
  }

  .hero-device {
    width: min(76vw, 250px);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

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

  .typing-caret {
    display: none;
  }
}