:root {
  --ink: #142826;
  --pine: #2a4a44;
  --water: #5c8a82;
  --mist: #dce8e4;
  --paper: #f1f5f3;
  --foam: #f7faf9;
  --sage: #7a948c;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.75;
  background: var(--foam);
  text-rendering: optimizeLegibility;
}

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

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

button {
  font: inherit;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--foam);
}

.skip:focus {
  top: 1rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.15rem 6vw;
  color: #f4f8f7;
  transition: background 0.4s var(--ease), color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(241, 245, 243, 0.92);
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(20, 40, 38, 0.08);
  backdrop-filter: blur(12px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  letter-spacing: 0.18em;
}

.logo img {
  width: auto;
  height: 40px;
  object-fit: contain;
}

.nav {
  display: flex;
  gap: 2rem;
  font-size: 0.92rem;
  letter-spacing: 0.14em;
}

.nav a {
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width 0.35s var(--ease);
}

.nav a:hover::after,
.nav a:focus-visible::after {
  width: 100%;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: #f4f8f7;
}

.hero-media {
  position: absolute;
  inset: 0;
  background: #071618;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  animation: kenburns 28s var(--ease) forwards;
}

.hero-media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(96, 214, 196, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 214, 196, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 40%, #000 10%, transparent 72%);
  pointer-events: none;
}

.hero-net {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    linear-gradient(
      to top,
      rgba(4, 16, 18, 0.82) 0%,
      rgba(4, 16, 18, 0.38) 48%,
      rgba(4, 16, 18, 0.22) 100%
    ),
    radial-gradient(ellipse at 70% 35%, rgba(48, 160, 148, 0.18), transparent 55%);
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 3;
  width: min(1120px, 88vw);
  margin: 0 auto 7vh;
  padding-top: 7rem;
}

.hero-brand {
  margin: 0 0 1.1rem;
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5.6vw, 4.6rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.14em;
  animation: rise 1.15s var(--ease) 0.12s both;
}

.hero-title {
  margin: 0 0 0.85rem;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 400;
  letter-spacing: 0.22em;
  animation: rise 1.15s var(--ease) 0.28s both;
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 28em;
  font-size: 1rem;
  color: rgba(244, 248, 247, 0.86);
  animation: rise 1.15s var(--ease) 0.42s both;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  animation: rise 1.15s var(--ease) 0.55s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.55rem 1.35rem;
  border: 1px solid transparent;
  border-radius: 2px;
  letter-spacing: 0.12em;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn-solid {
  background: #f4f8f7;
  color: var(--ink);
}

.btn-solid:hover,
.btn-solid:focus-visible {
  background: #dce8e4;
}

.btn-ghost {
  border-color: rgba(244, 248, 247, 0.55);
  color: #f4f8f7;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(244, 248, 247, 0.12);
}

#about,
#scope {
  scroll-margin-top: 4.5rem;
}

.section {
  padding: 7.5rem 6vw;
}

.section-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.about {
  background: var(--paper);
  overflow: hidden;
}

.about-inner {
  position: relative;
}

.about-watermark {
  position: absolute;
  right: -0.15em;
  top: -0.35em;
  font-family: var(--serif);
  font-size: clamp(8rem, 24vw, 16rem);
  line-height: 1;
  color: rgba(20, 40, 38, 0.05);
  pointer-events: none;
  user-select: none;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--water);
  font-size: 0.82rem;
  letter-spacing: 0.28em;
}

.section h2 {
  margin: 0 0 1.5rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.motto {
  margin: 0;
  max-width: 34em;
  font-family: var(--serif);
  font-size: clamp(1.08rem, 1.7vw, 1.28rem);
  font-weight: 600;
  line-height: 2;
  letter-spacing: 0.04em;
}

.scope {
  background: var(--foam);
}

.scope-head {
  margin-bottom: 3.2rem;
}

.scope-head p {
  margin: 0;
  max-width: 32em;
  color: var(--pine);
}

.scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.scope-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem 1.5rem;
  padding: 1.6rem 0;
  border-top: 2px solid var(--mist);
}

.scope-list li:last-child {
  border-bottom: 2px solid var(--mist);
}

.scope-list .num {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--water);
  letter-spacing: 0.08em;
}

.scope-list h3 {
  margin: 0 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.scope-list p {
  margin: 0;
  color: var(--pine);
}

.note {
  margin: 2rem 0 0;
  color: var(--sage);
  font-size: 0.88rem;
}

.site-footer {
  padding: 2rem 6vw 2.4rem;
  background: var(--ink);
  color: rgba(241, 245, 243, 0.72);
  font-size: 0.86rem;
}

.footer-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.5rem;
  justify-content: space-between;
  align-items: flex-end;
}

.footer-meta {
  display: grid;
  gap: 0.25rem;
}

.footer-meta p {
  margin: 0;
}

.site-footer a {
  color: #dce8e4;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: #fff;
}

.reveal {
  opacity: 0;
  transform: translateY(1.4rem);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

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

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(1.2rem);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes kenburns {
  to {
    transform: scale(1.12);
  }
}

@media (min-width: 900px) {
  .scope-inner {
    display: grid;
    grid-template-columns: 0.38fr 0.62fr;
    gap: 4vw;
    align-items: start;
  }

  .scope-head {
    position: sticky;
    top: 6rem;
    margin-bottom: 0;
  }
}

@media (max-width: 720px) {
  .nav {
    gap: 1.1rem;
    font-size: 0.82rem;
  }

  .hero-copy {
    margin-bottom: 5vh;
  }

  .scope-list li {
    grid-template-columns: 3rem 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

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