:root {
  color-scheme: light;
  --paper: oklch(0.978 0.004 240);
  --paper-deep: oklch(0.952 0.008 240);
  --ink: oklch(0.23 0.015 250);
  --ink-soft: oklch(0.44 0.01 248);
  --accent: oklch(0.45 0.045 247);
  --accent-soft: oklch(0.92 0.015 245);
  --line: color-mix(in oklab, var(--ink) 16%, var(--paper));
  --surface: color-mix(in oklab, var(--paper-deep) 84%, white);
  --surface-strong: color-mix(in oklab, var(--paper-deep) 78%, white);
  --max-width: 1140px;
  --gutter: clamp(1.25rem, 2vw, 2rem);
  --section-gap: clamp(4.5rem, 8vw, 7.5rem);
  --display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --ui: "Manrope", "Noto Sans SC", sans-serif;
  --shadow: 0 14px 42px color-mix(in oklab, var(--ink) 6%, transparent);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--body);
  color: var(--ink);
  line-height: 1.68;
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--accent-soft) 28%, transparent), transparent 18%),
    linear-gradient(180deg, var(--paper), color-mix(in oklab, var(--paper-deep) 82%, white));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(color-mix(in oklab, var(--ink) 5%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in oklab, var(--ink) 5%, transparent) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.04;
  pointer-events: none;
  mask-image: linear-gradient(180deg, black, transparent 92%);
}

a {
  color: inherit;
}

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

.page-shell {
  width: min(calc(100% - 2 * var(--gutter)), var(--max-width));
  margin: 0 auto;
  position: relative;
}

.site-header,
.site-footer,
.hero,
.signal-row,
.about,
.practice,
.app-section,
.contact-section {
  position: relative;
  z-index: 1;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem 2rem;
  padding: 1.35rem 0 1rem;
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 8%, transparent);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.15rem;
  text-decoration: none;
  font-family: var(--ui);
}

.brand-mark,
.eyebrow,
.note-label,
.service-index,
.signal-label,
.footer-meta,
.app-status {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  font-family: var(--ui);
}

.brand-mark {
  color: var(--accent);
}

.brand-name {
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.brand-meta {
  color: var(--ink-soft);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.8rem 1.1rem;
  font-size: 0.95rem;
  font-family: var(--ui);
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.18rem;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 260ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.section {
  padding: var(--section-gap) 0 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: clamp(2rem, 7vw, 5.5rem);
  align-items: center;
  min-height: clamp(520px, 76vh, 820px);
}

.hero-kicker,
.eyebrow {
  margin: 0 0 1.1rem;
  color: var(--accent);
}

.hero-kicker {
  letter-spacing: 0.1em;
  font-size: 0.76rem;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.app-copy h2,
.contact-copy h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero h1 {
  max-width: 9ch;
  font-size: clamp(2.45rem, 5.9vw, 4.7rem);
}

.hero-text,
.about-copy p,
.practice-card p,
.contact-text,
.app-copy p,
.about-aside p {
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.5vw, 1.1rem);
}

.hero-text {
  max-width: 40rem;
  margin: 1.5rem 0 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.9rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.05rem;
  padding: 0 1.2rem;
  border-radius: 0.4rem;
  text-decoration: none;
  font-family: var(--ui);
  font-weight: 600;
  transition:
    transform 220ms ease,
    background-color 220ms ease,
    border-color 220ms ease,
    color 220ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 10px 22px color-mix(in oklab, var(--ink) 10%, transparent);
}

.button-secondary {
  border: 1px solid var(--line);
  background: color-mix(in oklab, white 58%, var(--paper));
}

.hero-ledger {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  margin-top: 2rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.hero-ledger span {
  position: relative;
}

.hero-ledger span + span::before {
  content: "";
  position: absolute;
  left: -0.55rem;
  top: 50%;
  width: 1px;
  height: 0.8rem;
  background: color-mix(in oklab, var(--ink) 14%, transparent);
  transform: translateY(-50%);
}

.hero-visual {
  position: relative;
}

.hero-photo,
.about-visual,
.app-visual {
  margin: 0;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: color-mix(in oklab, var(--paper-deep) 80%, white);
}

.hero-photo {
  border-radius: 0.55rem;
}

.hero-photo img {
  width: 100%;
  height: clamp(460px, 62vh, 740px);
  object-fit: cover;
  filter: saturate(0.68) contrast(0.92) brightness(0.95);
}

.hero-photo::after,
.about-visual::after,
.app-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, color-mix(in oklab, var(--ink) 36%, transparent));
}

.hero-photo figcaption,
.about-visual figcaption,
.app-visual figcaption {
  position: absolute;
  left: 1.2rem;
  bottom: 1rem;
  z-index: 1;
  color: color-mix(in oklab, white 88%, var(--paper));
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-family: var(--ui);
}

.hero-note {
  position: absolute;
  left: -2rem;
  bottom: 2rem;
  width: min(280px, 82%);
  padding: 1.25rem 1.35rem;
  border: 1px solid color-mix(in oklab, var(--ink) 10%, var(--paper));
  background: color-mix(in oklab, white 90%, var(--surface));
  box-shadow: 0 12px 30px color-mix(in oklab, var(--ink) 6%, transparent);
  border-radius: 0.45rem;
}

.note-label {
  margin: 0 0 0.65rem;
  color: var(--accent);
}

.note-title {
  margin: 0;
  font-family: var(--display);
  font-size: 1.22rem;
  line-height: 1.3;
}

.note-text {
  margin: 0.8rem 0 0;
}

.signal-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--line);
}

.signal-item {
  padding: 1.1rem 1.1rem;
  background: color-mix(in oklab, white 28%, transparent);
}

.signal-label {
  margin: 0 0 0.45rem;
  color: var(--accent);
}

.signal-value,
.footer-company {
  margin: 0;
}

.signal-value {
  font-size: 1rem;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr) minmax(220px, 0.55fr);
  gap: clamp(1.4rem, 4vw, 2.2rem);
  align-items: start;
}

.section-heading h2 {
  max-width: 13ch;
  font-size: clamp(1.65rem, 3.9vw, 3.1rem);
}

.section-intro {
  max-width: 30rem;
  margin: 1rem 0 0;
  color: var(--ink-soft);
}

.about-copy {
  padding-right: 1rem;
}

.about-visual {
  border-radius: 0.5rem;
}

.about-visual img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  filter: saturate(0.68) contrast(0.92) brightness(0.95);
}

.about-aside {
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.practice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(220px, 0.8fr);
  gap: 1px;
  margin-top: 2rem;
  background: var(--line);
}

.practice-card,
.principles {
  padding: clamp(1.4rem, 3vw, 1.9rem);
  background: color-mix(in oklab, white 84%, var(--paper));
}

.practice-card {
  min-height: 280px;
}

.practice-card h3 {
  margin: 1.9rem 0 0.8rem;
  font-family: var(--display);
  font-size: clamp(1.28rem, 1.8vw, 1.65rem);
  font-weight: 500;
}

.principles-list {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
}

.principles-list li + li {
  margin-top: 0.75rem;
}

.app-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1fr);
  gap: clamp(1.5rem, 4vw, 2.4rem);
  align-items: center;
  padding: clamp(2rem, 5vw, 3rem);
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--accent-soft) 24%, transparent), transparent 22%),
    linear-gradient(180deg, color-mix(in oklab, white 82%, var(--surface-strong)), color-mix(in oklab, white 90%, var(--paper)));
  border: 1px solid var(--line);
  border-radius: 0.45rem;
}

.app-copy h2,
.contact-copy h2 {
  font-size: clamp(1.75rem, 4.1vw, 3.15rem);
}

.app-copy p:last-of-type {
  margin-bottom: 1.4rem;
}

.app-status {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--accent);
}

.status-dot {
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0.28rem color-mix(in oklab, var(--accent) 18%, transparent);
}

.app-visual {
  border-radius: 0.45rem;
}

.app-visual img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  filter: saturate(0.7) contrast(0.92) brightness(0.96);
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.95fr);
  gap: 1.4rem 2rem;
  align-items: end;
  padding: clamp(2.4rem, 5vw, 3.2rem) 0 0;
  border-top: 1px solid var(--ink);
}

.contact-mail {
  justify-self: end;
  font-family: var(--ui);
  font-size: clamp(1.35rem, 3.2vw, 2.45rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  line-height: 1.12;
  word-break: break-word;
}

.contact-channel {
  display: grid;
  gap: 0.55rem;
  justify-items: end;
}

.contact-meta {
  margin: 0;
  color: var(--ink-soft);
}

.site-footer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem 2rem;
  padding: 1.7rem 0 2.4rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.footer-compliance p {
  margin: 0.25rem 0 0;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 760ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 760ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

  .reveal,
  .site-nav a::after,
  .button {
    transition: none;
  }

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

@media (max-width: 1024px) {
  .hero,
  .about-grid,
  .app-section,
  .contact-card,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .signal-row,
  .practice-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-note {
    position: static;
    width: auto;
    margin-top: 1rem;
  }

  .contact-mail {
    justify-self: start;
  }

  .contact-channel {
    justify-items: start;
  }
}

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero h1 {
    max-width: 10ch;
  }

  .hero-photo,
  .about-visual,
  .app-visual {
    border-radius: 0.45rem;
  }

  body::before {
    background-size: 24px 24px;
  }
}