:root {
  --ink: #071521;
  --deep: #0a1f33;
  --sea: #124a5c;
  --wave: #3db8c5;
  --foam: #7ec8d4;
  --mist: #c5dce3;
  --paper: #e8f4f7;
  --text: #d7ebf0;
  --muted: #8fb0bb;
  --accent: #3db8c5;
  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-body: "DM Sans", "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;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--foam);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: #fff;
}

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

.site-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 50% at 70% 10%, rgba(61, 184, 197, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 10% 80%, rgba(18, 74, 92, 0.55), transparent 50%),
    linear-gradient(165deg, #071521 0%, #0a1f33 45%, #0d2a3a 100%);
}

.site-bg::before {
  content: "";
  position: absolute;
  inset: -20%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cpath d='M0 60c20-12 40-12 60 0s40 12 60 0' fill='none' stroke='%233db8c5' stroke-opacity='0.06' stroke-width='1'/%3E%3C/svg%3E");
  background-size: 120px 120px;
  animation: drift 48s linear infinite;
  opacity: 0.9;
}

.site-bg::after {
  content: "";
  position: absolute;
  bottom: -10%;
  left: -5%;
  right: -5%;
  height: 45%;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(61, 184, 197, 0.06) 40%,
    rgba(10, 31, 51, 0.9)
  );
  animation: swell 14s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-60px, -30px, 0); }
}

@keyframes swell {
  from { transform: translateY(0) scaleX(1); }
  to { transform: translateY(-18px) scaleX(1.02); }
}

.wrap {
  width: min(1080px, calc(100% - 2.5rem));
  margin-inline: auto;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(7, 21, 33, 0.72);
  border-bottom: 1px solid rgba(126, 200, 212, 0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  color: var(--paper);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.brand-en {
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  justify-content: flex-end;
}

.nav a {
  color: var(--muted);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  position: relative;
  padding: 0.2rem 0;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--paper);
}

.nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 2px;
  background: var(--wave);
  border-radius: 1px;
}

/* —— Hero —— */
.hero {
  min-height: calc(100vh - 5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 0 5rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 9vw, 5.2rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: 0.06em;
  color: var(--paper);
  margin: 0 0 1.25rem;
  opacity: 0;
  transform: translateY(28px);
  animation: rise-in 1s var(--ease) 0.15s forwards;
}

.hero-lead {
  max-width: 28em;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--mist);
  margin: 0 0 2.25rem;
  opacity: 0;
  transform: translateY(20px);
  animation: rise-in 1s var(--ease) 0.4s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  opacity: 0;
  transform: translateY(16px);
  animation: rise-in 1s var(--ease) 0.65s forwards;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background 0.25s var(--ease),
    color 0.25s var(--ease),
    border-color 0.25s var(--ease),
    transform 0.25s var(--ease);
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

.btn-primary {
  background: var(--wave);
  color: var(--ink);
  font-weight: 600;
}

.btn-primary:hover {
  background: #5ecad4;
  color: var(--ink);
}

.btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(126, 200, 212, 0.35);
}

.btn-ghost:hover {
  border-color: var(--foam);
  color: #fff;
  background: rgba(61, 184, 197, 0.08);
}

/* —— Page sections —— */
.page-hero {
  padding: 3.5rem 0 2rem;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--paper);
  margin: 0 0 0.75rem;
}

.page-hero p {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
}

.section {
  padding: 1rem 0 4.5rem;
}

.prose {
  max-width: 40em;
}

.prose p {
  margin: 0 0 1.15rem;
  color: var(--mist);
}

.prose p:last-child {
  margin-bottom: 0;
}

.meta-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  border-top: 1px solid rgba(126, 200, 212, 0.15);
}

.meta-list li {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(126, 200, 212, 0.12);
  font-size: 0.95rem;
}

.meta-list dt,
.meta-list .label {
  color: var(--muted);
  letter-spacing: 0.04em;
}

.meta-list .value {
  color: var(--paper);
}

.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.service-list li {
  padding: 1.75rem 0;
  border-bottom: 1px solid rgba(126, 200, 212, 0.14);
}

.service-list li:first-child {
  border-top: 1px solid rgba(126, 200, 212, 0.14);
}

.service-list h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--paper);
  margin: 0 0 0.5rem;
}

.service-list p {
  margin: 0;
  max-width: 38em;
  color: var(--muted);
}

.contact-block {
  margin-top: 0.5rem;
}

.contact-block a.email {
  display: inline-block;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--paper);
  border-bottom: 1px solid rgba(61, 184, 197, 0.45);
  padding-bottom: 0.15rem;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.contact-block a.email:hover {
  color: #fff;
  border-color: var(--wave);
}

.contact-note {
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

/* —— Footer —— */
.site-footer {
  margin-top: auto;
  padding: 2.5rem 0 2rem;
  border-top: 1px solid rgba(126, 200, 212, 0.12);
  background: rgba(4, 14, 22, 0.55);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-inner .icp a {
  color: var(--mist);
}

.footer-inner .icp a:hover {
  color: var(--wave);
}

.footer-host {
  color: var(--mist);
}

/* —— Layout shell —— */
.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-main {
  flex: 1;
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .meta-list li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .hero {
    min-height: auto;
    padding-top: 3rem;
  }
}