:root {
  --bg: #e7eef1;
  --bg-deep: #0b1c24;
  --ink: #102029;
  --muted: #4d6270;
  --line: rgba(16, 32, 41, 0.12);
  --accent: #0f7a72;
  --accent-deep: #0a5c56;
  --accent-soft: rgba(15, 122, 114, 0.14);
  --sea: #1a8f9c;
  --sand: #d7c4a8;
  --panel: rgba(255, 255, 255, 0.55);
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-latin: "Syne", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --radius: 14px;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.page-bg__wash {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 90% 60% at 10% -10%, #c9dde4 0%, transparent 55%),
    radial-gradient(ellipse 70% 50% at 95% 5%, #bcd8d4 0%, transparent 50%),
    linear-gradient(180deg, #edf3f5 0%, #dde8ec 42%, #d2e0e4 100%);
}

.page-bg__grid {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(16, 32, 41, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 32, 41, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 75%);
}

.page-bg__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
}

.page-bg__glow--a {
  width: 420px;
  height: 420px;
  top: 12%;
  right: -8%;
  background: rgba(26, 143, 156, 0.22);
  animation: drift 14s ease-in-out infinite;
}

.page-bg__glow--b {
  width: 360px;
  height: 360px;
  bottom: 18%;
  left: -10%;
  background: rgba(215, 196, 168, 0.28);
  animation: drift 18s ease-in-out infinite reverse;
}

@keyframes drift {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(-24px, 18px);
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  backdrop-filter: blur(14px);
  background: rgba(231, 238, 241, 0.72);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.55rem;
  background: var(--bg-deep);
  color: #e8f2f1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
}

.brand-mark__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.site-nav a:hover {
  color: var(--ink);
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(15, 122, 114, 0.35);
  color: var(--accent-deep) !important;
  background: rgba(255, 255, 255, 0.55);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.nav-cta:hover {
  background: #fff;
  border-color: var(--accent);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

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

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.5rem 1.25rem 1rem;
  background: rgba(231, 238, 241, 0.96);
  border-bottom: 1px solid var(--line);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  padding: 0.85rem 0.25rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 1.05rem;
}

.mobile-nav a:last-child {
  border-bottom: 0;
  color: var(--accent-deep);
  font-weight: 500;
}

.hero {
  display: grid;
  gap: 2.5rem;
  align-items: end;
  max-width: var(--max);
  margin: 0 auto;
  min-height: calc(100svh - 4.5rem);
  padding: 2.5rem 1.25rem 3.5rem;
}

.hero__eyebrow {
  margin: 0 0 0.85rem;
  font-family: var(--font-latin);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.hero__brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.2rem, 12vw, 6.5rem);
  line-height: 1.02;
  letter-spacing: 0.06em;
}

.hero__lead {
  margin: 1.25rem 0 0;
  max-width: 28rem;
  font-size: 1.05rem;
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.7rem 1.35rem;
  border-radius: 0.8rem;
  font-size: 0.98rem;
  font-weight: 500;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--accent);
  color: #f4fffe;
  box-shadow: 0 10px 28px rgba(15, 122, 114, 0.28);
}

.btn--primary:hover {
  background: var(--accent-deep);
}

.btn--ghost {
  border: 1px solid rgba(16, 32, 41, 0.16);
  background: rgba(255, 255, 255, 0.45);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: rgba(15, 122, 114, 0.45);
  color: var(--accent-deep);
}

.hero__stage {
  width: 100%;
  max-width: 34rem;
  justify-self: stretch;
}

.type-panel {
  position: relative;
  padding: 1.35rem 1.4rem 1.6rem;
  border-radius: 1.15rem;
  background: linear-gradient(
    160deg,
    rgba(11, 28, 36, 0.94) 0%,
    rgba(14, 42, 48, 0.92) 100%
  );
  color: #e8f2f1;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 30px 60px rgba(11, 28, 36, 0.28);
  overflow: hidden;
}

.type-panel::before {
  content: "";
  position: absolute;
  inset: auto -20% -40% 20%;
  height: 70%;
  background: radial-gradient(
    circle,
    rgba(26, 143, 156, 0.35),
    transparent 65%
  );
  pointer-events: none;
}

.type-panel__bar {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1.4rem;
}

.type-panel__bar span {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: rgba(232, 242, 241, 0.22);
}

.type-panel__bar span:first-child {
  background: #c9796a;
}

.type-panel__bar span:nth-child(2) {
  background: #d7c4a8;
}

.type-panel__bar span:nth-child(3) {
  background: #4fa89a;
}

.type-panel__hint {
  margin: 0 0 1.1rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(232, 242, 241, 0.5);
  font-family: var(--font-latin);
}

.type-panel__zh {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  color: rgba(232, 242, 241, 0.72);
}

.type-panel__en {
  margin: 0;
  min-height: 2.4rem;
  font-family: var(--font-latin);
  font-size: clamp(1.2rem, 3.5vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #f4fffe;
}

.caret {
  display: inline-block;
  width: 0.12em;
  height: 1.05em;
  margin-left: 0.08em;
  vertical-align: -0.12em;
  background: #7fd4cb;
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.5rem 1.25rem;
}

.section__intro {
  max-width: 36rem;
  margin-bottom: 2.5rem;
}

.section__intro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.section__intro p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.product {
  border-top: 1px solid var(--line);
}

.product-feature {
  padding: 2rem 0 0;
}

.product-feature__name {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-deep);
  font-family: var(--font-latin);
}

.product-feature__domain {
  margin: 0.35rem 0 0;
  font-family: var(--font-latin);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--muted);
}

.product-feature h3 {
  margin: 1rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.35rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.25;
}

.product-feature__desc {
  margin: 1rem 0 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.product-points {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
  max-width: 40rem;
}

.product-points li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--ink);
}

.product-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
}

.product-feature__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

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

.about__grid {
  display: grid;
  gap: 2rem;
}

.about__block h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
}

.about__block p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  max-width: 28rem;
}

.contact {
  border-top: 1px solid var(--line);
  padding-bottom: 5rem;
}

.contact__rows {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.contact__row {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.contact__label {
  color: var(--muted);
  font-size: 0.92rem;
}

.contact__value {
  font-size: 1.05rem;
  font-weight: 500;
}

a.contact__value:hover {
  color: var(--accent-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer {
  background: var(--bg-deep);
  color: rgba(232, 242, 241, 0.78);
  padding: 2.5rem 1.25rem 1.5rem;
}

.site-footer__top {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.site-footer__brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: #f4fffe;
  letter-spacing: 0.06em;
}

.site-footer__tag {
  margin: 0.35rem 0 0;
  font-size: 0.92rem;
  color: rgba(232, 242, 241, 0.5);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  font-size: 0.95rem;
}

.site-footer__links a:hover {
  color: #f4fffe;
}

.site-footer__bottom {
  max-width: var(--max);
  margin: 2rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(232, 242, 241, 0.12);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.8rem;
  color: rgba(232, 242, 241, 0.45);
}

.site-footer__beian {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
}

.site-footer__beian a:hover {
  color: rgba(232, 242, 241, 0.85);
}

.animate-in {
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.85s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-in--2 {
  animation-delay: 0.08s;
}

.animate-in--3 {
  animation-delay: 0.16s;
}

.animate-in--4 {
  animation-delay: 0.24s;
}

.animate-in--5 {
  animation-delay: 0.32s;
}

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

@media (min-width: 720px) {
  .site-nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }

  .hero {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
    align-items: center;
    padding-top: 3.5rem;
    padding-bottom: 4.5rem;
  }

  .hero__stage {
    justify-self: end;
  }

  .about__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
  }

  .contact__row {
    grid-template-columns: 7rem 1fr;
  }

  .site-footer__top {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

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

  .animate-in,
  .page-bg__glow,
  .caret {
    animation: none !important;
  }

  .animate-in {
    opacity: 1;
    transform: none;
  }
}