:root {
  --ink: #0b1c18;
  --forest: #0f2f28;
  --teal: #1a5c50;
  --amber: #d4a017;
  --paper: #f4f7f5;
  --muted-bg: #e8efeb;
  --line: rgba(11, 28, 24, 0.12);
  --text: #1c2f2a;
  --muted: #5b726a;
  --white: #ffffff;
  --font-display: "Fredoka", "ZCOOL KuaiLe", "Noto Sans SC", sans-serif;
  --font-body: "Nunito", "Noto Sans SC", sans-serif;
  --max: 1120px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
.container { width: min(var(--max), calc(100% - 2.5rem)); margin-inline: auto; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  width: 100%;
  flex: 0 0 0;
  height: 0;
  overflow: visible;
  transition: background .3s ease, border-color .3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-solid {
  background: var(--ink);
  backdrop-filter: none;
  border-bottom-color: rgba(255, 255, 255, .08);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
  position: relative;
  flex-wrap: nowrap;
}
.brand {
  display: flex;
  flex-direction: column;
  gap: .05rem;
  color: var(--white);
  flex-shrink: 0;
  z-index: 2;
}
.brand strong {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.brand span {
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  opacity: .7;
}
/* PC 默认隐藏汉堡；仅手机端显示 nav-toggle-pc-hide-v2 */
.nav-toggle {
  display: none;
  border: 0;
  background: #fff;
  color: #111;
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  width: 2.35rem;
  height: 2.35rem;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 2;
}
.nav-wrap > .nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1.1rem;
  flex: 1;
  flex-wrap: nowrap;
  opacity: 1;
  position: static;
  background: transparent;
  padding: 0;
  margin: 0;
  border: 0;
}
.nav-wrap > .nav a {
  color: rgba(255, 255, 255, .92);
  font-size: .9rem;
  white-space: nowrap;
  padding: 0;
  border: 0;
}
.nav-wrap > .nav a.is-active,
.nav-wrap > .nav a:hover { color: var(--amber); }

.hero {
  position: relative;
  overflow: hidden;
  min-height: 62vh;
  display: flex;
  align-items: flex-end;
  color: var(--white);
  background:
    linear-gradient(120deg, rgba(7, 24, 20, .88), rgba(20, 90, 78, .55)),
    url("https://images.unsplash.com/photo-1509391366360-2e959784a276?auto=format&fit=crop&w=2000&q=80") center/cover;
}
.hero-ambient {
  position: absolute;
  inset: -12% -8%;
  pointer-events: none;
  background:
    radial-gradient(ellipse 42% 36% at 18% 72%, rgba(245, 196, 84, .28), transparent 70%),
    radial-gradient(ellipse 48% 40% at 88% 18%, rgba(90, 196, 170, .22), transparent 68%);
  animation: jy-ambient 14s ease-in-out infinite alternate;
}
.hero-inner { position: relative; z-index: 1; padding: 6.5rem 0 3rem; }
.hero-brand {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: .02em;
}
.hero h1 {
  margin: 0 0 .9rem;
  max-width: 18ch;
  font-size: clamp(1.25rem, 2.4vw, 1.85rem);
  font-weight: 600;
  line-height: 1.35;
}
.hero p {
  margin: 0 0 1.5rem;
  max-width: 36rem;
  color: rgba(255, 255, 255, .86);
}

.page-hero {
  padding: 8rem 0 3rem;
  color: var(--white);
  background:
    linear-gradient(120deg, rgba(7, 24, 20, .9), rgba(20, 90, 78, .72)),
    url("https://images.unsplash.com/photo-1497440001374-f26997328c1b?auto=format&fit=crop&w=1800&q=80") center/cover;
}
/* 消费品页：布局不变，仅换头图（非集中式/地面电站） */
.page-hero.hero-lifestyle {
  background:
    linear-gradient(120deg, rgba(7, 24, 20, .9), rgba(20, 90, 78, .72)),
    url("https://images.unsplash.com/photo-1551632811-561732d1e306?auto=format&fit=crop&w=1800&q=80") center/cover;
}
.page-hero h1 {
  margin: 0 0 .7rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 700;
}
.page-hero p { margin: 0; max-width: 40rem; opacity: .88; }

.section { padding: 4.2rem 0; }
.section-muted { background: var(--muted-bg); }
.section-head { max-width: 40rem; margin-bottom: 1.8rem; }
.eyebrow {
  display: inline-block;
  color: var(--teal);
  letter-spacing: .14em;
  text-transform: uppercase;
  font-size: .75rem;
  font-weight: 700;
  margin-bottom: .45rem;
}
.section-head h2 {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
  color: var(--ink);
}
.section-head p { margin: 0; color: var(--muted); }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: stretch;
}
.panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
  padding: 1.4rem 1.5rem 1.5rem;
  transition: transform .35s cubic-bezier(.22,.8,.3,1), box-shadow .35s ease;
}
.panel h3 {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
}
.panel p { margin: 0; color: var(--muted); }
.panel:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(7, 24, 20, .07);
}
.list-plain {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: .2rem;
}
.list-plain li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding: .55rem 0;
  color: var(--muted);
  font-size: .92rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.tile {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.25rem;
  min-height: 150px;
}
.tile h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
}
.tile p { margin: 0; color: var(--muted); font-size: .95rem; }
.tile-case {
  padding: 0;
  overflow: hidden;
  min-height: 0;
}
.tile-case img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  background: var(--muted-bg);
}
.tile-case h3 {
  margin: 1rem 1.1rem .45rem;
}
.tile-case p {
  margin: 0 1.1rem 1.15rem;
}

.feature-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.feature-rail article,
.feature-rail.deep-pages > a {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.2rem;
  transition: transform .35s cubic-bezier(.22,.8,.3,1), box-shadow .35s ease, border-color .25s ease;
}
.feature-rail.deep-pages > a {
  display: block;
  color: inherit;
  text-decoration: none;
}
.feature-rail article:hover,
.feature-rail.deep-pages > a:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(7, 24, 20, .08);
  border-color: rgba(20, 90, 78, .28);
}
.feature-rail.deep-pages {
  grid-template-columns: repeat(3, 1fr);
}
.section-alive { position: relative; overflow: hidden; }
.alive-orbs {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.alive-orbs span {
  position: absolute;
  border-radius: 50%;
  filter: blur(28px);
  opacity: .45;
  animation: jy-orb 11s ease-in-out infinite alternate;
}
.alive-orbs span:first-child {
  width: 16rem;
  height: 16rem;
  left: -4rem;
  top: 12%;
  background: rgba(90, 196, 170, .35);
}
.alive-orbs span:last-child {
  width: 13rem;
  height: 13rem;
  right: -3rem;
  bottom: 8%;
  background: rgba(245, 196, 84, .28);
  animation-delay: -4s;
}
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s cubic-bezier(.22,.8,.3,1), transform .7s cubic-bezier(.22,.8,.3,1);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }
.reveal-delay-4 { transition-delay: .32s; }
@keyframes jy-ambient {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(2.5%, -1.5%, 0) scale(1.05); }
}
@keyframes jy-orb {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(12px, -18px, 0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-ambient,
  .alive-orbs span { animation: none; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .feature-rail article,
  .feature-rail.deep-pages > a,
  .panel { transition: none; }
  .feature-rail article:hover,
  .feature-rail.deep-pages > a:hover,
  .panel:hover { transform: none; box-shadow: none; }
}
.feature-rail h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
}
.feature-rail h3 a {
  color: inherit;
  text-decoration: none;
}
.feature-rail h3 a:hover { color: var(--teal); }
.feature-rail p { margin: 0; color: var(--muted); font-size: .92rem; }

.contact-box {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 1.2rem;
}

.cta-row { display: flex; flex-wrap: wrap; gap: .8rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: .65rem 1.15rem;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(120deg, var(--amber), #f0c14b);
  color: var(--ink);
}
.btn-ghost {
  border-color: rgba(255, 255, 255, .5);
  color: var(--white);
}
.btn-dark {
  background: var(--forest);
  color: var(--white);
}
.btn-outline {
  border-color: var(--forest);
  color: var(--forest);
  background: transparent;
}

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, .78);
  padding: 2rem 0;
  margin-top: auto;
  flex-shrink: 0;
  width: 100%;
}
.site-footer .container,
.site-footer .footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: .35rem;
}
.site-footer strong { color: var(--white); }
.site-footer p { margin: 0; }
.site-footer .footer-icp { opacity: .85; font-size: .92rem; }
.site-footer a {
  color: rgba(255, 255, 255, .72);
  text-decoration: none;
}
.site-footer a:hover { color: var(--white); text-decoration: underline; }

@media (max-width: 960px) {
  .split, .grid-3, .feature-rail, .contact-box { grid-template-columns: 1fr 1fr; }
}
/* 手机端：显示汉堡，导航默认收起 */
@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
    transition: transform .28s cubic-bezier(.22,.8,.3,1), background .2s ease;
  }
  .nav-toggle.is-open {
    transform: rotate(90deg);
    background: rgba(255,255,255,.12);
  }
  .nav-wrap > .nav {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .35rem 0 .6rem;
    background: rgba(11, 28, 24, .96);
    border: 1px solid rgba(255,255,255,.08);
    z-index: 20;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transform-origin: top center;
    transition:
      opacity .28s ease,
      transform .32s cubic-bezier(.22,.8,.3,1),
      visibility .28s;
  }
  .nav-wrap > .nav.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-wrap > .nav a {
    padding: .7rem 1rem;
    border-bottom: 1px solid rgba(255,255,255,.08);
    opacity: 0;
    transform: translateY(-8px);
    transition:
      opacity .26s ease,
      transform .28s cubic-bezier(.22,.8,.3,1),
      background .2s ease,
      color .2s ease;
  }
  .nav-wrap > .nav.is-open a {
    opacity: 1;
    transform: translateY(0);
  }
  .nav-wrap > .nav.is-open a:nth-child(1) { transition-delay: .04s; }
  .nav-wrap > .nav.is-open a:nth-child(2) { transition-delay: .08s; }
  .nav-wrap > .nav.is-open a:nth-child(3) { transition-delay: .12s; }
  .nav-wrap > .nav.is-open a:nth-child(4) { transition-delay: .16s; }
  .nav-wrap > .nav.is-open a:nth-child(5) { transition-delay: .2s; }
  .nav-wrap > .nav.is-open a:nth-child(6) { transition-delay: .24s; }
  .nav-wrap > .nav a:last-child { border-bottom: 0; }
}
.cert-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}
.cert-strip figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  text-align: center;
}
.cert-strip img {
  width: 100%;
  height: 28rem;
  object-fit: contain;
  background: #f3f1ea;
}
.cert-strip figcaption {
  margin-top: .65rem;
  color: var(--muted);
  font-size: .92rem;
  text-align: center;
}
@media (max-width: 640px) {
  .cert-strip img { height: 22rem; }
}

@media (max-width: 640px) {
  .split, .grid-3, .feature-rail, .contact-box, .cert-strip { grid-template-columns: 1fr; }
  .hero { min-height: 70vh; }
  .hero-inner { padding-top: 6.5rem; }
}