:root {
  --ink: #101820;
  --ink-soft: #42505a;
  --paper: #f5f7f4;
  --white: #ffffff;
  --cyan: #59d6d0;
  --amber: #ffb447;
  --line: rgba(16, 24, 32, 0.16);
  --content: min(1180px, calc(100vw - 64px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  width: 100%;
  height: 86px;
  padding: 0 max(32px, calc((100vw - 1320px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  transition: background 240ms ease, height 240ms ease, color 240ms ease;
}

.site-header.is-scrolled {
  height: 72px;
  color: var(--ink);
  background: rgba(245, 247, 244, 0.94);
  border-color: var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: var(--cyan);
  font: 700 24px/1 "Roboto Mono", monospace;
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-size: 16px;
  font-weight: 700;
}

.brand-copy small {
  font: 500 9px/1.2 "Roboto Mono", monospace;
  letter-spacing: 0.08em;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  font-size: 14px;
}

.site-nav a {
  position: relative;
  padding: 12px 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 5px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms ease;
}

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

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  margin: 6px auto;
  background: currentColor;
  transition: transform 220ms ease;
}

.hero {
  position: relative;
  min-height: 760px;
  height: min(88vh, 940px);
  display: flex;
  align-items: center;
  color: var(--white);
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 17, 23, 0.92) 0%, rgba(7, 17, 23, 0.7) 33%, rgba(7, 17, 23, 0.08) 70%),
    linear-gradient(0deg, rgba(7, 17, 23, 0.54) 0%, transparent 45%),
    url("/assets/hero.jpg") center center / cover no-repeat;
  transform: scale(1.01);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: var(--content);
  margin: 50px auto 0;
}

.eyebrow {
  margin: 0 0 24px;
  color: var(--cyan);
  font: 500 11px/1.4 "Roboto Mono", monospace;
  letter-spacing: 0.14em;
}

.hero h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(52px, 6vw, 88px);
  line-height: 1.08;
  font-weight: 700;
}

.hero-lead {
  max-width: 590px;
  margin: 30px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 40px;
}

.button {
  min-height: 52px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: var(--ink);
  background: var(--cyan);
}

.button-primary:hover {
  background: #7be4df;
}

.button-quiet {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.46);
}

.button-quiet:hover {
  color: var(--ink);
  background: var(--white);
}

.hero-index {
  position: absolute;
  right: max(32px, calc((100vw - 1320px) / 2));
  bottom: 32px;
  z-index: 2;
  display: flex;
  gap: 22px;
  color: rgba(255, 255, 255, 0.62);
  font: 500 10px/1 "Roboto Mono", monospace;
}

.scroll-cue {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 30px;
  width: 24px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 20px;
}

.scroll-cue span {
  position: absolute;
  top: 8px;
  left: 50%;
  width: 3px;
  height: 7px;
  border-radius: 4px;
  background: var(--white);
  transform: translateX(-50%);
  animation: scroll 1.8s ease infinite;
}

@keyframes scroll {
  0% { transform: translate(-50%, 0); opacity: 0; }
  30% { opacity: 1; }
  80% { opacity: 0; }
  100% { transform: translate(-50%, 16px); opacity: 0; }
}

.section {
  width: var(--content);
  margin: 0 auto;
  padding: 128px 0;
}

.section-label {
  display: flex;
  align-items: flex-start;
  gap: 22px;
  font: 500 10px/1.3 "Roboto Mono", monospace;
}

.section-label span {
  color: var(--ink-soft);
}

.section-label p {
  margin: 0;
  color: var(--ink);
  letter-spacing: 0.12em;
}

.intro {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
}

.kicker {
  margin: 0 0 18px;
  color: #3f7776;
  font-size: 14px;
  font-weight: 600;
}

h2 {
  margin: 0;
  font-size: clamp(38px, 4.2vw, 62px);
  line-height: 1.18;
  font-weight: 600;
}

.intro-lead {
  max-width: 790px;
  margin: 32px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 2;
}

.principles {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}

.principles div {
  min-height: 150px;
  padding: 28px 24px 24px 0;
  display: grid;
  align-content: start;
  gap: 18px;
  border-right: 1px solid var(--line);
}

.principles div + div {
  padding-left: 24px;
}

.principles div:last-child {
  border-right: 0;
}

.principles strong {
  font-size: 22px;
}

.principles span {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.services {
  width: 100%;
  padding-left: max(32px, calc((100vw - 1180px) / 2));
  padding-right: max(32px, calc((100vw - 1180px) / 2));
  color: var(--white);
  background: var(--ink);
}

.section-heading {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
  margin-bottom: 72px;
}

.section-label-light span,
.section-label-light p {
  color: rgba(255, 255, 255, 0.58);
}

.services .kicker {
  color: var(--cyan);
}

.service-list {
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}

.service-item {
  min-height: 170px;
  display: grid;
  grid-template-columns: 80px 1.2fr 1.5fr 44px;
  align-items: center;
  gap: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.22);
  transition: background 200ms ease, padding 200ms ease;
}

.service-item:hover {
  padding: 0 18px;
  background: rgba(89, 214, 208, 0.08);
}

.service-number {
  color: var(--amber);
  font: 500 12px/1 "Roboto Mono", monospace;
}

.service-title h3 {
  margin: 0 0 8px;
  font-size: 25px;
  font-weight: 600;
}

.service-title p {
  margin: 0;
  color: rgba(255, 255, 255, 0.48);
  font: 500 10px/1.4 "Roboto Mono", monospace;
  text-transform: uppercase;
}

.service-item > p {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 15px;
  line-height: 1.8;
}

.service-arrow {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 50%;
}

.method {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 110px;
}

.method-copy .section-label {
  margin-bottom: 72px;
}

.method-copy > p:last-child {
  max-width: 540px;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.9;
}

.process {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.process li {
  min-height: 142px;
  display: grid;
  grid-template-columns: 68px 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.process li > span {
  color: #3f7776;
  font: 500 11px/1 "Roboto Mono", monospace;
}

.process strong {
  font-size: 20px;
}

.process p {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.contact {
  position: relative;
  min-height: 580px;
  padding: 110px max(32px, calc((100vw - 1180px) / 2));
  display: grid;
  place-items: center;
  color: var(--white);
  background:
    linear-gradient(120deg, rgba(8, 25, 31, 0.97), rgba(13, 47, 53, 0.9)),
    url("/assets/hero.jpg") center 70% / cover no-repeat;
  overflow: hidden;
}

.contact::before {
  content: "²";
  position: absolute;
  right: 4vw;
  bottom: -0.22em;
  color: rgba(89, 214, 208, 0.09);
  font: 700 min(42vw, 620px)/1 "Roboto Mono", monospace;
}

.contact-inner {
  position: relative;
  z-index: 1;
  max-width: 880px;
  text-align: center;
}

.contact-inner .eyebrow {
  margin-bottom: 20px;
}

.contact-inner p:not(.eyebrow) {
  margin: 24px 0 36px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 17px;
}

.contact-meta {
  position: absolute;
  left: max(32px, calc((100vw - 1180px) / 2));
  right: max(32px, calc((100vw - 1180px) / 2));
  bottom: 30px;
  display: flex;
  justify-content: space-between;
  color: rgba(255, 255, 255, 0.48);
  font: 500 10px/1 "Roboto Mono", monospace;
}

footer {
  min-height: 120px;
  padding: 30px max(32px, calc((100vw - 1180px) / 2));
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 50px;
  color: rgba(255, 255, 255, 0.62);
  background: #0a1015;
  font-size: 12px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--white);
}

.footer-brand .brand-mark {
  width: 32px;
  height: 32px;
  font-size: 19px;
}

.footer-brand strong {
  font-size: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease, transform 700ms ease;
}

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

@media (max-width: 900px) {
  :root {
    --content: min(100% - 40px, 680px);
  }

  .site-header {
    height: 72px;
    padding: 0 20px;
  }

  .menu-toggle {
    position: relative;
    z-index: 22;
    display: block;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(3.5px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 0;
    padding: 120px 32px 40px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    color: var(--white);
    background: var(--ink);
    transform: translateX(100%);
    transition: transform 260ms ease;
  }

  .site-nav.is-open {
    transform: none;
  }

  .site-nav a {
    width: 100%;
    padding: 18px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.16);
    font-size: 22px;
  }

  .hero {
    min-height: 690px;
    height: 90vh;
  }

  .hero-backdrop {
    background-position: 62% center;
  }

  .hero h1 {
    font-size: clamp(42px, 12vw, 64px);
  }

  .hero-lead {
    max-width: 520px;
    font-size: 16px;
  }

  .hero-index {
    display: none;
  }

  .scroll-cue {
    left: auto;
    right: 24px;
  }

  .section {
    padding: 92px 0;
  }

  .intro,
  .section-heading,
  .method {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .section-heading {
    margin-bottom: 48px;
  }

  .services {
    padding-left: 20px;
    padding-right: 20px;
  }

  .service-item {
    grid-template-columns: 50px 1fr 36px;
    gap: 14px;
    padding: 28px 0;
  }

  .service-item > p {
    grid-column: 2 / -1;
  }

  .service-arrow {
    grid-column: 3;
    grid-row: 1;
    width: 36px;
    height: 36px;
  }

  .method {
    gap: 54px;
  }

  .method-copy .section-label {
    margin-bottom: 48px;
  }

  footer {
    grid-template-columns: 1fr;
    gap: 18px;
    padding-top: 38px;
    padding-bottom: 38px;
  }
}

@media (max-width: 600px) {
  .brand-copy small {
    display: none;
  }

  .hero {
    min-height: 660px;
    max-height: 820px;
  }

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

  .hero h1 {
    font-size: 42px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    max-width: 260px;
  }

  h2 {
    font-size: 36px;
  }

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

  .principles div,
  .principles div + div {
    min-height: auto;
    padding: 24px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .service-item {
    min-height: 0;
  }

  .service-title h3 {
    font-size: 20px;
  }

  .contact {
    min-height: 560px;
  }

  .contact-inner p:not(.eyebrow) {
    font-size: 15px;
    line-height: 1.8;
  }

  .contact-inner .button {
    width: 100%;
    gap: 14px;
    font-size: 13px;
  }

  .contact-meta {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}