:root {
  --blue: #0a5ba8;
  --blue-deep: #063a6e;
  --blue-soft: #d7e8f7;
  --sulfur: #d9a514;
  --ink: #15202b;
  --muted: #5b6773;
  --paper: #f4f7fb;
  --white: #ffffff;
  --line: rgba(10, 91, 168, 0.14);
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-ui: "Sora", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
  --shadow-soft: 0 18px 40px rgba(6, 58, 110, 0.12);
  --radius: 4px;
  --header-h: 88px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  background:
    radial-gradient(1200px 600px at 90% -10%, rgba(217, 165, 20, 0.08), transparent 55%),
    radial-gradient(900px 500px at -10% 20%, rgba(10, 91, 168, 0.08), transparent 50%),
    linear-gradient(180deg, #eef3f8 0%, var(--white) 28%, var(--paper) 100%);
  overflow-x: hidden;
}

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

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.6em;
  letter-spacing: 0.02em;
}

p {
  margin: 0 0 1em;
}

.container {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  height: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  background: #ffffff;
  box-shadow: 0 1px 0 var(--line);
}

.header-inner {
  width: min(1180px, calc(100% - 2.5rem));
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  line-height: 0;
  text-decoration: none;
}

.brand-logo {
  display: block;
  height: 56px;
  width: auto;
  max-width: none;
  background: #ffffff;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  font-family: var(--font-ui);
  font-size: 0.92rem;
  font-weight: 500;
}

.site-nav a {
  position: relative;
  color: var(--blue-deep);
  opacity: 0.88;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--sulfur);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  opacity: 1;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: #ffffff;
  border-radius: var(--radius);
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--blue-deep);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  color: var(--white);
  overflow: hidden;
  isolation: isolate;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  transform: scale(1.04);
  animation: heroDrift 18s ease-in-out infinite alternate;
  will-change: transform;
  background: #063a6e;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(6, 36, 68, 0.78) 0%, rgba(6, 36, 68, 0.45) 42%, rgba(6, 36, 68, 0.22) 100%),
    linear-gradient(0deg, rgba(6, 36, 68, 0.72) 0%, transparent 42%);
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: calc(var(--header-h) + 4rem) 0 max(5.5rem, env(safe-area-inset-bottom, 0px) + 3rem);
}

.brand-lockup {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  color: #f2d889;
}

.hero h1 {
  font-size: clamp(2.8rem, 7vw, 5.2rem);
  font-weight: 700;
  margin-bottom: 0.55em;
  text-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.hero-lead {
  max-width: 28rem;
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.8rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 1.35rem;
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--sulfur);
  color: #1d1603;
}

.btn-primary:hover {
  background: #e8b51c;
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.16);
}

/* Sections */
.section {
  padding: 6.5rem 0;
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.8rem;
}

.section-head.light h2,
.section-head.light .section-desc,
.section-head.light .eyebrow {
  color: var(--white);
}

.eyebrow {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.7rem;
}

.section h2 {
  font-size: clamp(1.85rem, 3.4vw, 2.6rem);
  color: var(--blue-deep);
}

.section-desc {
  color: var(--muted);
  font-size: 1.02rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-media {
  position: relative;
}

.about-media::before {
  content: "";
  position: absolute;
  inset: 1.2rem -1.1rem -1.1rem 1.2rem;
  background:
    linear-gradient(135deg, rgba(10, 91, 168, 0.18), rgba(217, 165, 20, 0.18));
  z-index: -1;
}

.about-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  box-shadow: var(--shadow-soft);
}

.about-points {
  list-style: none;
  padding: 0;
  margin: 1.6rem 0 0;
  display: grid;
  gap: 1rem;
}

.about-points li {
  display: grid;
  gap: 0.2rem;
  padding-left: 1rem;
  border-left: 3px solid var(--sulfur);
}

.about-points strong {
  font-family: var(--font-display);
  color: var(--blue-deep);
  font-size: 1.05rem;
}

.about-points span {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Products */
.product-feature {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 2.2rem;
  align-items: center;
  margin-bottom: 2.2rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid var(--line);
}

.product-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.product-gallery img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  box-shadow: var(--shadow-soft);
}

.product-copy h3 {
  font-size: 1.65rem;
  color: var(--blue-deep);
}

.spec-list {
  margin: 1.2rem 0 0;
  display: grid;
  gap: 0.75rem;
}

.spec-list > div {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.spec-list dt {
  font-family: var(--font-ui);
  font-size: 0.86rem;
  color: var(--blue);
  font-weight: 600;
}

.spec-list dd {
  margin: 0;
  color: var(--muted);
}

.product-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  align-items: stretch;
}

.product-panel {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.product-panel img {
  width: 140px;
  height: 140px;
  object-fit: cover;
  object-position: center;
  display: block;
  margin: 0;
  align-self: start;
}

.product-panel > div {
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: 0.15rem;
}

.product-panel h3 {
  font-size: 1.25rem;
  color: var(--blue-deep);
  margin: 0 0 0.35em;
}

.product-panel p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Process */
.process {
  position: relative;
  background:
    linear-gradient(160deg, #063a6e 0%, #0a5ba8 48%, #0d6bbf 100%);
  color: var(--white);
  overflow: hidden;
}

.process::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 30% 20%, black, transparent 70%);
  pointer-events: none;
}

.process .container {
  position: relative;
}

.process-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.process-flow li {
  padding: 1.4rem 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(4px);
  transition: transform 0.3s ease, background 0.3s ease;
}

.process-flow li:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.12);
}

.step-num {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: #f2d889;
  margin-bottom: 0.7rem;
}

.process-flow h3 {
  font-size: 1.2rem;
  margin-bottom: 0.45em;
}

.process-flow p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.94rem;
}

/* Qualify */
.qualify-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.qualify-card {
  padding: 1.35rem 1.3rem;
  background: rgba(255, 255, 255, 0.8);
  border-top: 3px solid var(--blue);
}

.qualify-card h3 {
  font-size: 1.2rem;
  color: var(--blue-deep);
}

.qualify-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.qualify-visuals {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.qualify-visuals figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 0.75rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.qualify-visuals img {
  width: 100%;
  aspect-ratio: 3 / 4;
  height: auto;
  object-fit: contain;
  object-position: center;
  background: #f7f9fc;
}

.qualify-visuals figcaption {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--blue-deep);
  text-align: center;
}

.spec-table-wrap {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.4rem 1.5rem 1.6rem;
}

.spec-table-wrap h3 {
  font-size: 1.15rem;
  color: var(--blue-deep);
  margin-bottom: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.7rem 0.4rem;
  border-bottom: 1px solid var(--line);
}

th {
  font-family: var(--font-ui);
  color: var(--blue);
  font-weight: 600;
}

td:last-child {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* Culture */
.culture {
  background:
    linear-gradient(180deg, rgba(215, 232, 247, 0.55), rgba(255, 255, 255, 0.2));
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.culture-grid article {
  padding: 1.4rem 1.15rem;
  background: rgba(255, 255, 255, 0.75);
  border-bottom: 3px solid var(--sulfur);
}

.culture-grid h3 {
  font-size: 1.15rem;
  color: var(--blue-deep);
}

.culture-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

/* Partners */
.partner-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.7rem;
}

.partner-list li {
  padding: 0.95rem 0.8rem;
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--blue-deep);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
}

.rd-note {
  color: var(--muted);
  max-width: 48rem;
  margin: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--blue);
}

/* Contact */
.contact {
  background:
    linear-gradient(120deg, rgba(10, 91, 168, 0.08), rgba(217, 165, 20, 0.08)),
    var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-list {
  margin: 0;
  display: grid;
  gap: 1rem;
}

.contact-list > div {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 0.8rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.contact-list dt {
  font-family: var(--font-ui);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--blue);
}

.contact-list dd {
  margin: 0;
  color: var(--ink);
}

.contact-list a:hover {
  color: var(--blue);
}

.faq-list {
  display: grid;
  gap: 1rem;
}

.faq-list article {
  padding: 1.25rem 1.3rem;
  background: rgba(255, 255, 255, 0.8);
  border-left: 3px solid var(--blue);
}

.faq-list h3 {
  font-size: 1.1rem;
  color: var(--blue-deep);
  margin-bottom: 0.4em;
}

.faq-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  padding: 2.2rem 0 2.4rem;
  background: var(--blue-deep);
  color: rgba(255, 255, 255, 0.82);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: end;
  flex-wrap: wrap;
}

.footer-brand {
  display: grid;
  gap: 0.7rem;
}

.footer-brand p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.55;
}

.footer-meta {
  display: grid;
  gap: 0.35rem;
  text-align: right;
}

.copyright,
.beian {
  margin: 0;
  font-size: 0.84rem;
  opacity: 0.75;
}

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

.beian a:hover {
  opacity: 1;
  text-decoration: underline;
}

@media (max-width: 720px) {
  .footer-meta {
    text-align: left;
  }
}

/* Reveal motion */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

@keyframes heroDrift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.1) translate3d(-1.2%, -1%, 0); }
}

@media (max-width: 960px) {
  .hero-media img {
    object-position: center 28%;
  }

  .hero-veil {
    background:
      linear-gradient(180deg, rgba(6, 36, 68, 0.45) 0%, rgba(6, 36, 68, 0.22) 32%, rgba(6, 36, 68, 0.82) 100%),
      linear-gradient(90deg, rgba(6, 36, 68, 0.55) 0%, rgba(6, 36, 68, 0.2) 70%, transparent 100%);
  }

  .about-grid,
  .product-feature,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .process-flow,
  .culture-grid,
  .partner-list {
    grid-template-columns: 1fr 1fr;
  }

  .qualify-visuals {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 76px;
  }

  .brand-logo {
    height: 46px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 1rem;
    left: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    color: var(--blue-deep);
    opacity: 1;
    padding: 0.85rem 0.9rem;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    min-height: calc(100svh - 0px);
    min-height: 100dvh;
  }

  .hero-media img {
    object-position: center 30%;
    transform: none;
    animation: none;
  }

  .hero-veil {
    background:
      linear-gradient(
        180deg,
        rgba(6, 36, 68, 0.42) 0%,
        rgba(6, 36, 68, 0.2) 26%,
        rgba(6, 36, 68, 0.72) 62%,
        rgba(6, 36, 68, 0.9) 100%
      );
  }

  .hero-copy {
    width: min(1120px, calc(100% - 2rem));
    padding:
      calc(var(--header-h) + 2.2rem)
      0
      max(2.8rem, env(safe-area-inset-bottom, 0px) + 1.6rem);
  }

  .brand-lockup {
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    margin-bottom: 0.7rem;
  }

  .hero h1 {
    font-size: clamp(2.1rem, 9vw, 2.8rem);
    line-height: 1.2;
    margin-bottom: 0.45em;
  }

  .hero-lead {
    max-width: none;
    font-size: 0.98rem;
    line-height: 1.65;
    margin-bottom: 1.35rem;
  }

  .hero-actions {
    gap: 0.7rem;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
    min-width: 8.5rem;
  }

  .section {
    padding: 4.5rem 0;
  }

  .product-duo,
  .qualify-grid,
  .process-flow,
  .culture-grid,
  .partner-list,
  .qualify-visuals {
    grid-template-columns: 1fr;
  }

  .product-panel {
    grid-template-columns: 110px minmax(0, 1fr);
  }

  .product-panel img {
    width: 110px;
    height: 110px;
  }

  .product-panel > div {
    min-height: 110px;
  }

  .spec-list > div,
  .contact-list > div {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .about-media::before {
    inset: 0.8rem -0.6rem -0.6rem 0.8rem;
  }
}

@media (max-width: 420px) {
  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-media img {
    animation: none;
  }
}