@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@500;700&family=Source+Han+Sans+SC:wght@400;500;600&display=swap');

:root {
  --ink: #142422;
  --ink-soft: #3a524e;
  --mist: #e6efec;
  --paper: #f4f8f6;
  --teal: #2f6f66;
  --teal-deep: #1a4540;
  --teal-mid: #3d8a7e;
  --line: rgba(20, 36, 34, 0.12);
  --font-sans: 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Noto Serif SC', 'Songti SC', serif;
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE/Edge legacy */
}

html::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

body::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

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

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 4vw, 3rem);
  background: transparent;
  transition: background 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.35s ease;
}

.site-header.is-scrolled {
  background: rgba(244, 248, 246, 0.86);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
}

.brand-logo {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  line-height: 1.15;
}

.brand-mark {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--teal-deep);
}

.brand-sub {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lang-switch {
  position: relative;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(26, 69, 64, 0.18);
  background: rgba(255, 255, 255, 0.45);
  color: var(--teal-deep);
  font: inherit;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.lang-toggle:hover {
  background: #fff;
  border-color: var(--teal);
  transform: translateY(-1px);
}

.lang-toggle:active {
  transform: translateY(0);
}

.lang-icon {
  display: block;
  flex: 0 0 auto;
}

.lang-switch.is-open .lang-toggle {
  background: #fff;
  border-color: var(--teal);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 0.45rem);
  right: 0;
  min-width: 8.5rem;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 16px 40px rgba(20, 36, 34, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
  z-index: 50;
}

.lang-switch.is-open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.lang-menu button {
  display: block;
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.88rem;
  text-align: left;
  cursor: pointer;
}

.lang-menu button:hover,
.lang-menu button.is-active {
  background: rgba(47, 111, 102, 0.1);
  color: var(--teal-deep);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.5rem;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.btn:active {
  transform: translateY(0);
}

.btn-ghost {
  color: var(--ink-soft);
  background: transparent;
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--teal-deep);
}

.btn-outline {
  color: var(--teal-deep);
  background: rgba(255, 255, 255, 0.45);
  border-color: rgba(26, 69, 64, 0.22);
}

.btn-outline:hover {
  background: #fff;
  border-color: var(--teal);
}

.btn-solid {
  color: #f7fbfa;
  background: linear-gradient(160deg, var(--teal-mid), var(--teal-deep));
  box-shadow: 0 10px 28px rgba(26, 69, 64, 0.22);
}

.btn-solid:hover {
  background: linear-gradient(160deg, #4a9a8d, var(--teal));
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: 6.5rem clamp(1.25rem, 4vw, 3rem) 4rem;
  background:
    radial-gradient(ellipse 80% 55% at 78% 42%, rgba(61, 138, 126, 0.28), transparent 58%),
    radial-gradient(ellipse 60% 50% at 12% 18%, rgba(26, 69, 64, 0.16), transparent 55%),
    linear-gradient(165deg, #edf4f1 0%, #e2ece8 42%, #d5e4df 100%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(26, 69, 64, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 69, 64, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 75%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1120px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2rem, 6vw, 4.5rem);
  align-items: center;
}

.hero-copy {
  max-width: 34rem;
}

.hero-brand {
  margin: 0 0 1.1rem;
  font-family: var(--font-serif);
  font-size: clamp(2.6rem, 6.5vw, 4.4rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.06em;
  color: var(--teal-deep);
}

.hero-title {
  margin: 0 0 0.85rem;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 28rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: min(52vh, 420px);
}

.seal {
  position: relative;
  width: min(100%, 380px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  animation: seal-float 7s ease-in-out infinite;
}

.seal-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(26, 69, 64, 0.18);
  background:
    radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.55), transparent 42%),
    radial-gradient(circle at 70% 70%, rgba(47, 111, 102, 0.18), transparent 50%),
    linear-gradient(145deg, rgba(247, 251, 250, 0.92), rgba(214, 230, 224, 0.88));
  box-shadow:
    0 30px 80px rgba(20, 36, 34, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.seal-ring::after {
  content: '';
  position: absolute;
  inset: 0.55rem;
  border-radius: 50%;
  border: 1px dashed rgba(26, 69, 64, 0.18);
}

.seal-logo {
  position: relative;
  z-index: 1;
  width: 88%;
  height: auto;
  filter: drop-shadow(0 8px 18px rgba(26, 69, 64, 0.18));
}

.seal-glow {
  position: absolute;
  width: 70%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 138, 126, 0.35), transparent 68%);
  filter: blur(18px);
  animation: glow-pulse 5.5s ease-in-out infinite;
}

.section {
  padding: clamp(4rem, 9vw, 6.5rem) clamp(1.25rem, 4vw, 3rem);
}

.section-inner {
  width: min(1080px, 100%);
  margin: 0 auto;
}

.section-head {
  max-width: 36rem;
  margin-bottom: 2.4rem;
}

.section-head h2 {
  margin: 0 0 0.65rem;
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3.2vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--teal-deep);
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.features {
  background:
    linear-gradient(180deg, #f7fbfa 0%, #eef4f2 100%);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 2.75rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.feature-list h3 {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
}

.feature-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.96rem;
}

.products {
  background:
    radial-gradient(ellipse 70% 80% at 100% 0%, rgba(47, 111, 102, 0.1), transparent 55%),
    #f3f7f5;
}

.product-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.product-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.product-item:last-child {
  border-bottom: 1px solid var(--line);
}

.product-icon {
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  border-radius: 12px;
  object-fit: contain;
}

.product-icon-schedule {
  width: 3.35rem;
  height: 3.35rem;
  margin: -0.3rem 0.15rem -0.3rem -0.3rem;
  border-radius: 14px;
}

.product-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1.08rem;
}

.product-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.site-footer {
  padding: 2rem clamp(1.25rem, 4vw, 3rem) 2.4rem;
  background: #e8efec;
  border-top: 1px solid var(--line);
}

.footer-inner {
  width: min(1080px, 100%);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.footer-inner a {
  color: var(--ink-soft);
}

.footer-inner a:hover {
  color: var(--teal-deep);
  text-decoration: underline;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }

@keyframes seal-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.65; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .seal,
  .seal-glow { animation: none; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn:hover { transform: none; }
}

@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-copy {
    max-width: none;
    margin: 0 auto;
  }

  .hero-lead {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
    min-height: 240px;
  }

  .seal {
    width: min(72vw, 280px);
  }

  .feature-list,
  .product-row {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  .brand-sub {
    display: none;
  }

  .btn-ghost {
    display: none;
  }

  .lang-toggle {
    width: 2.35rem;
    height: 2.35rem;
  }
}