/* Honglian — clean industrial premium */
:root {
  --bg: #f6f4f1;
  --bg-elev: #ffffff;
  --bg-soft: #eceae6;
  --ink: #12151c;
  --ink-soft: #3d4450;
  --muted: #6b7280;
  --line: rgba(18, 21, 28, 0.1);
  --accent: #1d4ed8;
  --accent-soft: #dbe7ff;
  --steel: #334155;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 18px 50px rgba(18, 21, 28, 0.08);
  --shadow-sm: 0 8px 24px rgba(18, 21, 28, 0.06);
  --max: 1120px;
  --font: "Segoe UI", "Helvetica Neue", "PingFang SC", "Hiragino Sans",
    "Noto Sans JP", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button,
input,
textarea {
  font: inherit;
}

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

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(246, 244, 241, 0.86);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--ink);
  color: #e8eef7;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-text strong {
  display: block;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.brand-text span {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem 1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  padding: 0.35rem 0.2rem;
}

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

.nav-cta {
  background: var(--ink) !important;
  color: #fff !important;
  padding: 0.55rem 0.95rem !important;
  border-radius: 999px;
}

.lang-switch {
  display: inline-flex;
  gap: 0.2rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-elev);
}

.lang-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
}

.lang-btn.is-active {
  background: var(--ink);
  color: #fff;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% 40% auto -10%;
  height: 70%;
  background: radial-gradient(circle, rgba(29, 78, 216, 0.12), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--accent);
}

h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.35rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  font-weight: 700;
}

.lead {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 38rem;
  margin: 0 0 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #1e40af;
}

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

.btn-ghost:hover {
  background: var(--bg-elev);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.meta-card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}

.meta-card strong {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 0.2rem;
}

.meta-card span {
  font-size: 0.82rem;
  color: var(--muted);
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center;
  border-radius: 28px;
  box-shadow: var(--shadow);
  background: #fff;
}

.hero-badge {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.75rem 0.95rem;
  font-size: 0.85rem;
  max-width: 14rem;
  box-shadow: var(--shadow-sm);
}

.hero-badge strong {
  display: block;
}

/* Sections */
section {
  padding: 4.5rem 0;
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.25rem;
}

.section-head h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

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

.band {
  background: var(--bg-elev);
  border-block: 1px solid var(--line);
}

/* Equipment cards */
.equip-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.equip-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.equip-card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center;
  background: #fff;
}

.equip-card .body {
  padding: 1.15rem 1.2rem 1.35rem;
}

.equip-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.equip-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.equip-card.no-photo .body {
  padding-top: 1.4rem;
}

.equip-card.no-photo {
  background: linear-gradient(180deg, #fff, #f3f1ed);
}

.card-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-weight: 700;
  margin: 1.2rem 1.2rem 0;
}

/* Parts */
.parts-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.parts-block {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.parts-block h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
}

.parts-block > p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.parts-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
}

.parts-gallery img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
}

/* Process */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.process-step {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.2rem 1.4rem;
  position: relative;
}

.process-step .num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.process-step h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.process-step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Cases */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.cases-grid a,
.cases-grid figure {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.cases-grid img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center;
  background: #fff;
  transition: transform 0.35s ease;
}

.cases-grid a:hover img {
  transform: scale(1.04);
}

.cases-grid .wide {
  grid-column: span 2;
}

.cases-grid .wide img {
  aspect-ratio: 16 / 10;
  object-fit: contain;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: start;
}

.about-points {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.about-points li {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.about-panel {
  background: var(--ink);
  color: #e8eef7;
  border-radius: 24px;
  padding: 1.75rem;
  min-height: 100%;
  box-shadow: var(--shadow);
}

.about-panel img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  margin-bottom: 1rem;
  object-fit: contain;
  object-position: center;
  background: #fff;
}

.about-panel p {
  margin: 0;
  color: rgba(232, 238, 247, 0.78);
  font-size: 0.95rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 1.5rem;
}

.contact-card,
.contact-form {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.email-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-size: 1.05rem;
  font-weight: 650;
  color: var(--accent);
  word-break: break-all;
}


.line-block {
  margin-top: 1.5rem;
}

.line-qr {
  display: block;
  width: 180px;
  max-width: 100%;
  height: auto;
  margin-top: 0.75rem;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 0.5rem;
}


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

.form-row {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}

.form-row label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.form-row input,
.form-row textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
  background: #fff;
  color: var(--ink);
}

.form-row textarea {
  min-height: 120px;
  resize: vertical;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: 2px solid rgba(29, 78, 216, 0.25);
  border-color: var(--accent);
}

/* Footer */
.footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Lightbox simple */
.lightbox[hidden] {
  display: none !important;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(10, 12, 18, 0.82);
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.lightbox img {
  max-width: min(960px, 100%);
  max-height: 88vh;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: 0;
  background: #fff;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1.2rem;
}

/* Responsive */
@media (max-width: 980px) {
  .hero-grid,
  .parts-layout,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .equip-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .process-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cases-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-meta {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(246, 244, 241, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.25rem;
    flex-direction: column;
    align-items: stretch;
  }

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

  .nav-links a,
  .lang-switch {
    width: 100%;
    justify-content: center;
  }

  .equip-grid,
  .process-grid,
  .parts-gallery {
    grid-template-columns: 1fr;
  }

  .cases-grid .wide {
    grid-column: span 1;
  }

  h1 {
    font-size: 2rem;
  }

  section {
    padding: 3.25rem 0;
  }
}