/* =============================================================================
   Alukenta Global Styles — Industrial B2B Theme
   主色：深海蓝 #0B1F3A  强调金 #D4A843  金属银 #9EB3C2
   ============================================================================= */

:root {
  --navy:       #0B1F3A;
  --navy-mid:   #122840;
  --navy-light: #1A3555;
  --gold:       #D4A843;
  --gold-light: #EAC96A;
  --silver:     #9EB3C2;
  --steel:      #1E3048;
  --bg-light:   #F4F6F9;
  --text-dark:  #0D1B2E;
  --text-mid:   #4A5D72;
  --text-light: #7A90A4;
  --border:     #2A4060;
  --white:      #FFFFFF;
  --font-head:  'Arial Narrow', 'Segoe UI', Arial, sans-serif;
  --font-body:  system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; }

/* ── Typography ── */
h1,h2,h3,h4,h5 {
  font-family: var(--font-head);
  letter-spacing: .02em;
  line-height: 1.15;
}

.eyebrow {
  display: inline-block;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: .5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .75rem;
}

.section-title--white { color: #fff; }

.rule {
  width: 44px; height: 3px;
  background: var(--gold);
  margin-bottom: 1.4rem;
}

.rule--center { margin-inline: auto; }

.lead {
  font-size: 1rem;
  color: var(--text-mid);
  max-width: 560px;
  line-height: 1.8;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .78rem 1.9rem;
  transition: all .2s;
  cursor: pointer;
  border: none;
}

.btn-gold {
  background: var(--gold);
  color: var(--navy);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 0 100%);
}
.btn-gold:hover { background: var(--gold-light); transform: translateY(-1px); }

.btn-outline-white {
  border: 2px solid rgba(255,255,255,.65);
  color: #fff;
}
.btn-outline-white:hover { border-color: var(--gold); color: var(--gold); }

.btn-outline-gold {
  border: 2px solid var(--gold);
  color: var(--gold);
  background: transparent;
}
.btn-outline-gold:hover { background: var(--gold); color: var(--navy); }

/* ── NAV ── */
.site-nav {
  background: var(--navy);
  border-bottom: 2px solid var(--gold);
  position: sticky; top: 0; z-index: 1000;
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: .1em;
}
.logo span { color: var(--gold); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: rgba(255,255,255,.8);
  position: relative;
  padding-bottom: 2px;
  transition: color .2s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--gold);
  transition: width .25s;
}
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-links .nav-cta a {
  background: var(--gold);
  color: var(--navy);
  padding: .45rem 1.2rem;
  clip-path: none;
}
.nav-links .nav-cta a:hover { background: var(--gold-light); }
.nav-links .nav-cta a::after { display: none; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: #fff;
  transition: all .3s;
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  background: var(--navy);
  border-top: 1px solid var(--border);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: .9rem 1.5rem;
  color: rgba(255,255,255,.82);
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  transition: color .2s, background .2s;
}
.mobile-menu a:hover { color: var(--gold); background: rgba(255,255,255,.04); }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../../uploads/huitai_p7_1.jpg');
  background-size: cover;
  background-position: center 40%;
  filter: brightness(.32) saturate(.7);
}

.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg,
    rgba(11,31,58,.88) 0%,
    rgba(18,40,64,.7) 55%,
    rgba(30,48,72,.45) 100%);
}

.hero-content {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto;
  padding: 5rem 1.5rem;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  background: var(--gold);
  color: var(--navy);
  font-size: .68rem; font-weight: 800;
  letter-spacing: .16em; text-transform: uppercase;
  padding: .28rem .9rem;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.05;
  max-width: 820px;
  margin-bottom: 1.4rem;
}
.hero-title em { font-style: normal; color: var(--gold); }

.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,.75);
  max-width: 540px;
  margin-bottom: 2.2rem;
  line-height: 1.75;
}

.hero-btns { display: flex; flex-wrap: wrap; gap: .875rem; }

/* ── Stats bar ── */
.stats-bar {
  background: var(--navy-light);
  border-top: 3px solid var(--gold);
}
.stats-bar .inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat-item {
  text-align: center;
  padding: 1.75rem 1rem;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-family: var(--font-head);
  font-size: 2.6rem; font-weight: 800;
  color: var(--gold); line-height: 1;
  margin-bottom: .35rem;
}
.stat-label {
  font-size: .72rem;
  color: rgba(255,255,255,.55);
  letter-spacing: .07em;
  text-transform: uppercase;
}

@media (max-width: 600px) {
  .stats-bar .inner { grid-template-columns: repeat(2,1fr); }
  .stat-item:nth-child(2) { border-right: none; }
  .stat-item:nth-child(3) { border-top: 1px solid var(--border); }
  .stat-item:nth-child(4) { border-top: 1px solid var(--border); border-right: none; }
}

/* ── Sections ── */
.section { padding: 5rem 1.5rem; }
.section--light { background: var(--bg-light); }
.section--dark { background: var(--navy); }
.section--steel { background: var(--steel); }

.container { max-width: 1280px; margin: 0 auto; }

.section-head { margin-bottom: 3rem; }
.section-head--center { text-align: center; }
.section-head--center .rule { margin-inline: auto; }
.section-head--center .lead { margin-inline: auto; }

/* ── Grid helpers ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 1.5rem; }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; gap: 2rem; }
  .grid-4 { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 480px) {
  .grid-4 { grid-template-columns: 1fr; }
}

/* ── Cards ── */
.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  overflow: hidden;
  transition: box-shadow .25s, transform .25s;
}
.card:hover {
  box-shadow: 0 14px 44px rgba(11,31,58,.12);
  transform: translateY(-4px);
}
.card-img {
  width: 100%; height: 220px;
  object-fit: cover;
  filter: brightness(.9) saturate(.82);
  transition: filter .3s;
}
.card:hover .card-img { filter: brightness(1) saturate(1); }
.card-body { padding: 1.5rem; }
.card-cat {
  font-size: .65rem; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--gold); margin-bottom: .35rem;
}
.card-title {
  font-family: var(--font-head);
  font-size: 1.1rem; font-weight: 700;
  color: var(--navy); margin-bottom: .5rem;
  line-height: 1.3;
}
.card-desc { font-size: .86rem; color: var(--text-mid); line-height: 1.65; margin-bottom: 1rem; }

/* ── Process flow ── */
.process-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--navy);
  border-radius: 4px;
  padding: 2.5rem 1rem;
}
.proc-step {
  display: flex; flex-direction: column;
  align-items: center; text-align: center;
  flex: 1; min-width: 88px;
  padding: .5rem .25rem;
}
.proc-hex {
  width: 60px; height: 60px;
  background: var(--navy-light);
  border: 2px solid var(--gold);
  clip-path: polygon(25% 0%,75% 0%,100% 50%,75% 100%,25% 100%,0% 50%);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: .65rem;
  font-family: var(--font-head);
  font-size: 1rem; font-weight: 800;
  color: var(--gold);
}
.proc-name {
  font-size: .72rem; font-weight: 600;
  color: rgba(255,255,255,.85);
  line-height: 1.35;
}
.proc-cn { font-size: .6rem; color: rgba(255,255,255,.45); margin-top: .15rem; }
.proc-arrow {
  color: var(--gold); font-size: 1.3rem;
  flex-shrink: 0; padding: 0 .1rem;
  margin-bottom: 1.2rem;
}

@media (max-width: 640px) {
  .process-flow { flex-direction: column; }
  .proc-arrow { transform: rotate(90deg); margin: 0; }
}

/* ── Feature boxes ── */
.feature-box {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-top: 3px solid var(--gold);
  padding: 1.75rem 1.5rem;
  transition: box-shadow .25s;
}
.feature-box:hover { box-shadow: 0 8px 28px rgba(11,31,58,.09); }
.feature-icon {
  width: 48px; height: 48px;
  background: var(--navy);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
}
.feature-title {
  font-family: var(--font-head);
  font-size: 1.05rem; font-weight: 700;
  color: var(--navy); margin-bottom: .4rem;
}
.feature-desc { font-size: .86rem; color: var(--text-mid); line-height: 1.65; }

/* ── Case cards ── */
.case-card {
  position: relative; overflow: hidden;
  background: var(--steel); aspect-ratio: 4/3;
}
.case-card img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: .5; transition: opacity .3s, transform .4s;
}
.case-card:hover img { opacity: .3; transform: scale(1.05); }
.case-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 1.25rem;
  background: linear-gradient(to top, rgba(11,31,58,.96) 0%, transparent 100%);
}
.case-region {
  font-size: .68rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--gold); margin-bottom: .25rem;
}
.case-title {
  font-family: var(--font-head);
  font-size: 1rem; font-weight: 700; color: #fff;
  line-height: 1.3;
}

/* ── CTA band ── */
.cta-band {
  background: linear-gradient(135deg, var(--navy) 0%, var(--steel) 100%);
  border-top: 3px solid var(--gold);
  border-bottom: 3px solid var(--gold);
  padding: 4.5rem 1.5rem;
  text-align: center;
}
.cta-band h2 { color: #fff; margin-bottom: 1rem; }
.cta-band p { color: rgba(255,255,255,.7); max-width: 520px; margin: 0 auto 2rem; }
.cta-band .btns { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }

/* ── Page hero (inner pages) ── */
.page-hero {
  background: var(--navy);
  padding: 3.5rem 1.5rem;
  position: relative; overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute; right: -60px; top: -60px;
  width: 300px; height: 300px;
  background: var(--gold); opacity: .04;
  border-radius: 50%;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero-title {
  font-family: var(--font-head);
  font-size: clamp(2rem,4vw,3rem);
  font-weight: 800; color: #fff;
  margin-bottom: .4rem;
}
.breadcrumb { font-size: .8rem; color: rgba(255,255,255,.5); }
.breadcrumb a { color: var(--gold); }

/* ── Filter bar ── */
.filter-bar {
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  padding: .875rem 1.5rem;
  position: sticky; top: 64px; z-index: 40;
  overflow-x: auto;
}
.filter-bar-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; flex-wrap: nowrap; gap: .5rem;
}
.filter-btn {
  padding: .45rem 1rem;
  font-size: .75rem; font-weight: 600;
  letter-spacing: .05em; text-transform: uppercase;
  border: 1.5px solid #cbd5e1;
  background: #fff; color: var(--navy);
  cursor: pointer; white-space: nowrap;
  transition: all .2s;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--navy); border-color: var(--navy); color: #fff;
}

/* ── Tech tabs ── */
.tech-tabs-bar {
  background: var(--navy);
  border-bottom: 2px solid var(--border);
  overflow-x: auto;
  position: sticky; top: 64px; z-index: 40;
}
.tech-tabs-inner {
  max-width: 1280px; margin: 0 auto;
  padding: .75rem 1.5rem;
  display: flex; gap: .375rem; min-width: max-content;
}
.tech-tab {
  padding: .6rem 1.1rem;
  font-size: .75rem; font-weight: 600;
  letter-spacing: .05em; text-transform: uppercase;
  color: rgba(255,255,255,.6);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer; white-space: nowrap;
  transition: all .2s;
}
.tech-tab:hover { border-color: var(--gold); color: var(--gold); }
.tech-tab.active { background: var(--gold); border-color: var(--gold); color: var(--navy); }

.tech-panel { display: none; }
.tech-panel.active { display: block; }

/* ── Spec table ── */
.spec-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.spec-table tr { border-bottom: 1px solid #e8edf3; }
.spec-table td { padding: .65rem .75rem; }
.spec-table td:first-child { color: var(--text-light); width: 44%; font-weight: 500; }
.spec-table td:last-child { color: var(--text-dark); font-weight: 600; }

/* ── Contact form ── */
.form-label {
  display: block;
  font-size: .75rem; font-weight: 700;
  letter-spacing: .07em; text-transform: uppercase;
  color: var(--navy); margin-bottom: .35rem;
}
.form-field {
  width: 100%; padding: .7rem 1rem;
  border: 1.5px solid #cbd5e1;
  font-size: .9rem; color: var(--text-dark);
  font-family: var(--font-body);
  outline: none;
  transition: border-color .2s;
}
.form-field:focus { border-color: var(--navy); }
.form-textarea { resize: vertical; min-height: 130px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }

/* ── Footer ── */
.site-footer {
  background: var(--navy);
  border-top: 3px solid var(--gold);
  color: rgba(255,255,255,.65);
}
.footer-grid {
  max-width: 1280px; margin: 0 auto;
  padding: 3.5rem 1.5rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
}
.footer-logo {
  font-family: var(--font-head);
  font-size: 1.6rem; font-weight: 800;
  color: #fff; letter-spacing: .1em;
  margin-bottom: 1rem;
}
.footer-logo span { color: var(--gold); }
.footer-tagline { font-size: .85rem; line-height: 1.65; }
.footer-heading {
  font-size: .68rem; font-weight: 700;
  letter-spacing: .15em; text-transform: uppercase;
  color: var(--gold);
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: .9rem;
}
.footer-link {
  display: block; font-size: .85rem;
  color: rgba(255,255,255,.6);
  margin-bottom: .35rem;
  transition: color .2s;
}
.footer-link:hover { color: var(--gold); }
.footer-contact { display: flex; gap: .6rem; font-size: .85rem; margin-bottom: .65rem; align-items: flex-start; }
.footer-contact-icon { color: var(--gold); flex-shrink: 0; margin-top: .1rem; }
.footer-bottom {
  border-top: 1px solid var(--border);
  max-width: 1280px; margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: .5rem;
  font-size: .75rem; color: rgba(255,255,255,.35);
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ── Content visibility ── */
.reveal { opacity: 1; transform: none; }

/* ── Contact methods ── */
.contact-method {
  background: #fff; border: 1px solid #e2e8f0;
  border-left: 4px solid var(--gold);
  padding: 1.4rem 1.5rem;
  display: flex; align-items: center; gap: 1rem;
}
.contact-method-icon {
  width: 44px; height: 44px;
  background: var(--navy);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* ── Responsive section padding ── */
@media (max-width: 768px) {
  .section { padding: 3.5rem 1.25rem; }
  .hero { min-height: 440px; }
  .hero-content { padding: 3rem 1.25rem; }
}


/* v6 audited component styles */
.equipment-group { margin-bottom: 4rem; scroll-margin-top: 130px; }
.equipment-group__head { border-left: 4px solid var(--gold); padding-left: 1rem; margin-bottom: 1.5rem; }
.equipment-group__head h2 { color: var(--navy); font-size: 1.65rem; }
.equipment-group__head p { color: var(--text-light); font-size: .8rem; }
.card-action { font-size: .72rem; padding: .45rem 1rem; margin-top: 1rem; }
.process-heading { display:flex; align-items:center; gap:.875rem; margin-bottom:1rem; }
.process-number { font-family:var(--font-heading); font-size:3.5rem; font-weight:800; color:var(--gold); line-height:1; }
.process-heading .section-title { font-size:1.85rem; margin:0; }
.process-cn { font-size:.78rem; color:var(--text-light); margin-top:.15rem; }
.parameter-heading { font-family:var(--font-body); font-size:.76rem; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--navy); margin-bottom:.75rem; }
.parameter-list { list-style:none; font-size:.875rem; color:var(--text-mid); line-height:1.85; }
.parameter-list li { display:flex; gap:.5rem; margin-bottom:.35rem; }
.parameter-list li span { color:var(--gold); flex-shrink:0; }
.tech-action { margin-top:1.5rem; font-size:.75rem; padding:.5rem 1.2rem; }
.tech-image { width:100%; aspect-ratio:4/3; object-fit:cover; filter:brightness(.92) saturate(.88); box-shadow:0 12px 40px rgba(11,31,58,.15); }
@media (max-width: 640px) {
  .process-heading { align-items:flex-start; }
  .process-number { font-size:2.75rem; }
  .tech-image { aspect-ratio:3/2; }
}