:root {
  color-scheme: light;
  /* 文创工坊配色：墨黑 + 朱砂红 + 宣纸米白 + 烫金 */
  --color-primary: #26221f;
  --color-primary-light: #3d3833;
  --color-primary-dark: #16130f;
  --color-accent: #d4442a;
  --color-accent-hover: #b83621;
  --color-accent-light: #fbeae5;
  --color-gold: #c9a227;
  --color-gold-light: #f5edd6;
  --color-background: #f6f3ec;
  --color-surface: #fffdf8;
  --color-text: #2b2620;
  --color-muted-text: #7a7268;
  --color-border: #e3ddd0;
  --color-focus: #d4442a;
  --color-success: #3d8b5f;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --space-unit: 0.25rem;
  --content-width: 75rem;
  --header-height: 72px;
  --shadow-sm: 0 1px 2px rgba(38,34,31,0.06);
  --shadow-md: 0 3px 10px rgba(38,34,31,0.08);
  --shadow-lg: 0 10px 30px rgba(38,34,31,0.10);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
}

/* 宣纸纹理背景 */
body {
  margin: 0; min-height: 100dvh; display: flex; flex-direction: column;
  background-image:
    radial-gradient(rgba(38,34,31,0.025) 1px, transparent 1px),
    radial-gradient(rgba(38,34,31,0.018) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px;
  background-position: 0 0, 12px 12px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }

button, input, select, textarea { font: inherit; }

:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }

.skip-link { left: 1rem; position: fixed; top: 1rem; transform: translateY(-200%); z-index: 100; background: var(--color-accent); color: #fff; padding: 0.5rem 1rem; border-radius: var(--radius-sm); }
.skip-link:focus { transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== Container ===== */
.container { max-width: var(--content-width); margin: 0 auto; padding: 0 1.5rem; width: 100%; }

/* ===== Header ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: var(--color-primary);
  height: var(--header-height);
  border-bottom: 3px solid var(--color-accent);
}
.header-inner {
  max-width: var(--content-width); margin: 0 auto; padding: 0 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.logo { display: inline-flex; align-items: center; gap: 0.75rem; color: #fff; text-decoration: none; }
.logo:hover, .logo:focus { color: #fff; }
.logo-icon {
  width: auto; height: 42px; display: block; flex: 0 0 auto;
  object-fit: contain; filter: brightness(0) invert(1); opacity: 1; transform: none;
}
.logo-copy { display: flex; flex-direction: column; justify-content: center; line-height: 1; }
.logo-text { display: block; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; line-height: 1.2; letter-spacing: 0.06em; }
.logo-sub { font-size: 0.68rem; line-height: 1.2; opacity: 0.6; display: block; letter-spacing: 0.12em; }

.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav a {
  color: rgba(255,255,255,0.8); padding: 0.5rem 0.85rem; font-size: 0.9rem;
  border-radius: var(--radius-sm); transition: all var(--transition); position: relative;
  white-space: nowrap;
}
.main-nav a:hover { color: #fff; }
.main-nav a.active { color: var(--color-gold); font-weight: 600; }
.header-cta {
  background: var(--color-accent); color: #fff; padding: 0.55rem 1.25rem;
  border-radius: var(--radius-sm); font-weight: 600; font-size: 0.88rem;
  border: none; cursor: pointer; transition: all var(--transition); white-space: nowrap;
  text-decoration: none; display: inline-flex; align-items: center; gap: 0.4rem;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.25);
}
.header-cta:hover { background: var(--color-accent-hover); color: #fff; transform: translate(-1px,-1px); box-shadow: 3px 3px 0 rgba(0,0,0,0.25); }

.mobile-toggle { display: none; background: none; border: none; color: #fff; cursor: pointer; padding: 0.5rem; }
.mobile-toggle svg { width: 24px; height: 24px; }

main { margin-top: var(--header-height); flex: 1; }

/* ===== Hero / Banner ===== */
.hero {
  background:
    linear-gradient(rgba(38,34,31,0.88), rgba(38,34,31,0.88)),
    repeating-linear-gradient(45deg, var(--color-primary) 0px, var(--color-primary) 10px, var(--color-primary-light) 10px, var(--color-primary-light) 20px);
  color: #fff; padding: 5.5rem 0 5rem; position: relative; overflow: hidden;
}
.hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 4px;
  background: repeating-linear-gradient(90deg, var(--color-accent) 0, var(--color-accent) 24px, transparent 24px, transparent 32px);
}
.hero-content { position: relative; z-index: 1; max-width: 680px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: transparent; padding: 0.4rem 1rem; border-radius: 3px;
  font-size: 0.82rem; margin-bottom: 1.5rem;
  border: 1px dashed rgba(255,255,255,0.35);
  letter-spacing: 0.08em;
}
.hero-badge::before { content: '◆'; color: var(--color-gold); font-size: 0.6rem; }
.hero h1 { font-family: var(--font-display); font-size: 2.8rem; font-weight: 800; line-height: 1.3; margin-bottom: 1.25rem; letter-spacing: 0.04em; }
.hero h1 span { color: var(--color-gold); position: relative; }
.hero p { font-size: 1.05rem; opacity: 0.85; line-height: 1.8; margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn-primary {
  background: var(--color-accent); color: #fff; padding: 0.8rem 2rem;
  border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem;
  border: none; cursor: pointer; transition: all var(--transition);
  text-decoration: none; display: inline-flex; align-items: center; gap: 0.5rem;
  box-shadow: 3px 3px 0 rgba(0,0,0,0.2);
}
.btn-primary:hover { background: var(--color-accent-hover); color: #fff; transform: translate(-1px,-1px); box-shadow: 4px 4px 0 rgba(0,0,0,0.2); }
.btn-outline {
  background: transparent; color: #fff; padding: 0.8rem 2rem;
  border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem;
  border: 2px solid rgba(255,255,255,0.35); cursor: pointer; transition: all var(--transition);
  text-decoration: none; display: inline-flex; align-items: center; gap: 0.5rem;
}
.btn-outline:hover { border-color: var(--color-gold); color: var(--color-gold); background: rgba(255,255,255,0.05); }

/* ===== Section ===== */
.section { padding: 4.5rem 0; }
.section-alt { background: var(--color-surface); }
.section-dark {
  background:
    linear-gradient(rgba(38,34,31,0.9), rgba(38,34,31,0.9)),
    repeating-linear-gradient(-45deg, var(--color-primary) 0px, var(--color-primary) 10px, var(--color-primary-light) 10px, var(--color-primary-light) 20px);
  color: #fff;
}
.section-header { text-align: left; margin-bottom: 2.5rem; position: relative; padding-left: 1.1rem; }
.section-header::before {
  content: ''; position: absolute; left: 0; top: 0.35rem; bottom: 0.35rem;
  width: 5px; background: var(--color-accent); border-radius: 2px;
}
.section-header h2 { font-family: var(--font-display); font-size: 1.9rem; font-weight: 800; margin-bottom: 0.5rem; letter-spacing: 0.03em; }
.section-header p { color: var(--color-muted-text); font-size: 1rem; max-width: 640px; }
.section-dark .section-header p { color: rgba(255,255,255,0.65); }
.section-dark .section-header::before { background: var(--color-gold); }

/* ===== Product Category Grid ===== */
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
.category-card {
  background: var(--color-surface); border-radius: var(--radius-md); padding: 2rem 1.5rem;
  text-align: center; border: 1px solid var(--color-border); transition: all var(--transition);
  text-decoration: none; color: var(--color-text); display: block;
  box-shadow: 3px 3px 0 var(--color-border);
}
.category-card:hover { transform: translate(-2px,-2px); box-shadow: 5px 5px 0 var(--color-accent); border-color: var(--color-accent); color: var(--color-text); }
.category-icon {
  width: 62px; height: 62px; border-radius: var(--radius-sm); margin: 0 auto 1rem;
  display: flex; align-items: center; justify-content: center; font-size: 1.6rem;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-accent);
}
.category-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.category-card p { font-size: 0.82rem; color: var(--color-muted-text); line-height: 1.5; }

/* ===== Product Grid ===== */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.product-card {
  background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--color-border); transition: all var(--transition);
  text-decoration: none; color: var(--color-text); display: block;
}
.product-card:hover { transform: translateY(-3px); box-shadow: 5px 5px 0 var(--color-border); color: var(--color-text); }
.product-thumb {
  aspect-ratio: 4/3; position: relative; overflow: hidden;
  border-bottom: 2px solid var(--color-primary);
}
.product-thumb-inner {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; color: rgba(255,255,255,0.9); font-weight: 500;
  transition: transform var(--transition);
}
.product-card:hover .product-thumb-inner { transform: scale(1.03); }
.product-tag {
  position: absolute; top: 0.75rem; left: 0.75rem; background: var(--color-gold);
  color: var(--color-primary-dark); font-size: 0.7rem; padding: 0.2rem 0.6rem; border-radius: 3px; font-weight: 700;
  letter-spacing: 0.05em;
}
.product-info { padding: 1rem 1.25rem; }
.product-info h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.3rem; }
.product-info p { font-size: 0.8rem; color: var(--color-muted-text); }

/* ===== Factory Strength ===== */
.strength-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.strength-card {
  background: transparent;
  border: 1px dashed rgba(255,255,255,0.25);
  border-radius: var(--radius-md); padding: 2rem 1.5rem; text-align: center;
  transition: all var(--transition);
}
.strength-card:hover { border-color: var(--color-gold); background: rgba(255,255,255,0.04); }
.strength-number { font-size: 2.4rem; font-weight: 800; color: var(--color-gold); margin-bottom: 0.3rem; font-family: var(--font-display); }
.strength-unit { font-size: 0.9rem; }
.strength-label { font-size: 0.9rem; opacity: 0.75; }

/* ===== Advantage ===== */
.advantage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.advantage-card {
  background: var(--color-surface); border-radius: var(--radius-md); padding: 2rem;
  border: 1px solid var(--color-border); transition: all var(--transition);
  position: relative;
}
.advantage-card:hover { box-shadow: 4px 4px 0 var(--color-border); transform: translate(-1px,-1px); }
.advantage-icon {
  width: 48px; height: 48px; border-radius: var(--radius-sm); margin-bottom: 1rem;
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
  background: var(--color-accent-light); color: var(--color-accent);
  border: 1px solid var(--color-accent);
}
.advantage-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; }
.advantage-card p { font-size: 0.88rem; color: var(--color-muted-text); line-height: 1.6; }

/* ===== Process Flow ===== */
.process-flow { display: flex; align-items: flex-start; gap: 0; justify-content: center; flex-wrap: wrap; }
.process-step {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  width: 140px; position: relative;
}
.process-step::after {
  content: '→'; position: absolute; top: 28px; right: -20px;
  color: var(--color-accent); font-size: 1.2rem; font-weight: 700;
}
.process-step:last-child::after { display: none; }
.process-num {
  width: 56px; height: 56px; border-radius: 50%; background: var(--color-primary);
  color: var(--color-gold); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; font-weight: 700; margin-bottom: 0.75rem;
  font-family: var(--font-display);
  border: 2px solid var(--color-gold);
  box-shadow: 2px 2px 0 rgba(38,34,31,0.2);
}
.process-step h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.3rem; }
.process-step p { font-size: 0.75rem; color: var(--color-muted-text); }

/* ===== Cases ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.case-card {
  background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--color-border); transition: all var(--transition);
}
.case-card:hover { box-shadow: 4px 4px 0 var(--color-border); }
.case-thumb {
  aspect-ratio: 16/10; display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.9); font-size: 0.85rem; font-weight: 500;
  border-bottom: 2px solid var(--color-primary);
}
.case-info { padding: 1.25rem; }
.case-info h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.3rem; }
.case-info p { font-size: 0.82rem; color: var(--color-muted-text); }
.case-tags { display: flex; gap: 0.5rem; margin-top: 0.75rem; flex-wrap: wrap; }
.case-tag {
  font-size: 0.7rem; padding: 0.2rem 0.6rem; border-radius: 3px;
  background: var(--color-accent-light); color: var(--color-accent); font-weight: 600;
  border: 1px solid var(--color-accent);
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-question {
  width: 100%; background: none; border: none; padding: 1.25rem 0;
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; font-size: 1rem; font-weight: 600; text-align: left;
  color: var(--color-text); transition: color var(--transition);
}
.faq-question:hover { color: var(--color-accent); }
.faq-question::after { content: '+'; font-size: 1.4rem; color: var(--color-accent); transition: transform var(--transition); }
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer { padding: 0 0 1.25rem; font-size: 0.9rem; color: var(--color-muted-text); line-height: 1.7; display: none; }
.faq-item.open .faq-answer { display: block; }

/* ===== Contact / Inquiry ===== */
.inquiry-section {
  background:
    linear-gradient(rgba(38,34,31,0.9), rgba(38,34,31,0.9)),
    repeating-linear-gradient(45deg, var(--color-primary) 0px, var(--color-primary) 10px, var(--color-primary-light) 10px, var(--color-primary-light) 20px);
}
.inquiry-section > .container > h2 { color: #fffdf8; }
.inquiry-section > .container > p { color: rgba(255,253,248,0.82); }
.inquiry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.inquiry-info { color: #fff; }
.inquiry-info h2 { font-family: var(--font-display); font-size: 2rem; font-weight: 800; margin-bottom: 1rem; letter-spacing: 0.03em; }
.inquiry-info p { opacity: 0.85; line-height: 1.7; margin-bottom: 1.5rem; }
.inquiry-contact-item { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; font-size: 0.95rem; }
.inquiry-contact-item svg, .inquiry-contact-item i { width: 18px; height: 18px; flex-shrink: 0; color: var(--color-gold); font-size: 1rem; }
.inquiry-form {
  background: var(--color-surface); border-radius: var(--radius-md); padding: 2.5rem;
  border: 2px solid var(--color-primary);
  box-shadow: 6px 6px 0 rgba(0,0,0,0.25);
}
.inquiry-form h3 { font-family: var(--font-display); font-size: 1.3rem; font-weight: 800; margin-bottom: 1.25rem; }
.inquiry-form-intro { color: var(--color-muted-text); line-height: 1.8; margin-bottom: 1.75rem; }
.inquiry-form-actions { display: flex; flex-direction: column; gap: 0.75rem; }
.inquiry-form-actions .btn-primary,
.inquiry-form-actions .btn-outline { width: 100%; justify-content: center; }
.inquiry-form .btn-outline {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.inquiry-form .btn-outline:hover {
  color: #fff;
  border-color: var(--color-accent-hover);
  background: var(--color-accent-hover);
}
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.4rem; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 0.7rem 1rem; border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); font-size: 0.9rem; transition: border-color var(--transition);
  background: var(--color-background);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--color-accent); outline: none;
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* ===== Footer ===== */
.site-footer { background: var(--color-primary-dark); color: rgba(255,255,255,0.65); padding: 3.5rem 0 0; border-top: 4px solid var(--color-accent); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2.5rem; }
.footer-brand p { font-size: 0.85rem; line-height: 1.7; margin-top: 1rem; }
.footer-col h4 { color: var(--color-gold); font-size: 0.95rem; margin-bottom: 1rem; font-family: var(--font-display); letter-spacing: 0.05em; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { color: rgba(255,255,255,0.6); font-size: 0.85rem; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-col li i { width: 16px; margin-right: 0.4rem; color: var(--color-gold); font-size: 0.8rem; }
.footer-bottom {
  border-top: 1px dashed rgba(255,255,255,0.15); padding: 1.25rem 0;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.8rem;
}

/* ===== Breadcrumb / Page Banner ===== */
.page-banner {
  background:
    linear-gradient(rgba(38,34,31,0.85), rgba(38,34,31,0.85)),
    repeating-linear-gradient(45deg, var(--color-primary) 0px, var(--color-primary) 10px, var(--color-primary-light) 10px, var(--color-primary-light) 20px);
  color: #fff; padding: 3rem 0 2.5rem; position: relative;
}
.page-banner::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: repeating-linear-gradient(90deg, var(--color-gold) 0, var(--color-gold) 20px, transparent 20px, transparent 28px);
}
.breadcrumb { display: flex; gap: 0.5rem; font-size: 0.85rem; opacity: 0.7; margin-bottom: 0.75rem; align-items: center; }
.breadcrumb a { color: rgba(255,255,255,0.7); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { color: rgba(255,255,255,0.4); }
.page-banner h1 { font-family: var(--font-display); font-size: 2rem; font-weight: 800; letter-spacing: 0.04em; }
.page-banner p { font-size: 1rem; opacity: 0.8; margin-top: 0.5rem; }

/* ===== Product Detail ===== */
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
.product-gallery { border-radius: var(--radius-md); overflow: hidden; border: 2px solid var(--color-primary); }
.product-gallery-main {
  aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: rgba(255,255,255,0.8);
}
.product-meta h1 { font-family: var(--font-display); font-size: 1.8rem; font-weight: 800; margin-bottom: 0.5rem; }
.product-meta .subtitle { color: var(--color-muted-text); font-size: 1rem; margin-bottom: 1.5rem; }
.product-specs { margin: 1.5rem 0; }
.spec-row { display: flex; padding: 0.6rem 0; border-bottom: 1px dashed var(--color-border); font-size: 0.9rem; }
.spec-label { width: 100px; color: var(--color-muted-text); flex-shrink: 0; }
.spec-value { font-weight: 600; }

/* ===== Content Page ===== */
.content-block { max-width: 860px; margin: 0 auto; }
.content-block h2 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 800; margin: 2.5rem 0 1rem; }
.content-block h3 { font-size: 1.15rem; font-weight: 700; margin: 2rem 0 0.75rem; }
.content-block p { font-size: 0.95rem; line-height: 1.8; color: var(--color-muted-text); margin-bottom: 1rem; }
.content-block ul, .content-block ol { margin: 0.75rem 0 1.5rem 1.5rem; }
.content-block li { font-size: 0.95rem; line-height: 1.8; color: var(--color-muted-text); margin-bottom: 0.3rem; }

/* ===== News List ===== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.news-card {
  background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--color-border); transition: all var(--transition);
}
.news-card:hover { box-shadow: 4px 4px 0 var(--color-border); }
.news-thumb { aspect-ratio: 16/9; display: flex; align-items: center; justify-content: center; font-size: 0.85rem; color: rgba(255,255,255,0.85); border-bottom: 2px solid var(--color-primary); }
.news-info { padding: 1.25rem; }
.news-date { font-size: 0.75rem; color: var(--color-muted-text); margin-bottom: 0.4rem; }
.news-info h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.3rem; line-height: 1.5; }
.news-info p { font-size: 0.82rem; color: var(--color-muted-text); line-height: 1.6; }

/* ===== Application Tabs ===== */
.tab-nav { display: flex; gap: 0.5rem; margin-bottom: 2rem; justify-content: center; flex-wrap: wrap; }
.tab-btn {
  padding: 0.6rem 1.5rem; border-radius: 3px; border: 1px solid var(--color-border);
  background: var(--color-surface); cursor: pointer; font-size: 0.9rem; font-weight: 600;
  transition: all var(--transition); color: var(--color-text);
}
.tab-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.tab-btn.active { background: var(--color-accent); color: #fff; border-color: var(--color-accent); box-shadow: 2px 2px 0 rgba(38,34,31,0.2); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== Contact Page ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.contact-info-card {
  background: var(--color-surface); border-radius: var(--radius-md); padding: 2rem;
  border: 1px solid var(--color-border); margin-bottom: 1.5rem;
}
.contact-info-card h3 { font-family: var(--font-display); font-size: 1.1rem; font-weight: 800; margin-bottom: 1rem; }
.contact-item { display: flex; gap: 0.75rem; margin-bottom: 1rem; font-size: 0.9rem; }
.contact-item svg, .contact-item i { width: 20px; height: 20px; flex-shrink: 0; color: var(--color-accent); margin-top: 2px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .strength-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .inquiry-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--color-primary); flex-direction: column; padding: 1rem; border-top: 1px solid rgba(255,255,255,0.1); }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 0.75rem 1rem; width: 100%; }
  .mobile-toggle { display: block; }
  .header-cta { display: none; }
  .hero { padding: 3rem 0; }
  .hero h1 { font-size: 1.8rem; }
  .section { padding: 3rem 0; }
  .section-header h2 { font-size: 1.5rem; }
  .category-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .strength-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .process-flow { flex-direction: column; align-items: center; }
  .process-step { width: 100%; max-width: 200px; }
  .process-step::after { content: '↓'; top: auto; bottom: -16px; right: 50%; transform: translateX(50%); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions a, .hero-actions button { width: 100%; justify-content: center; }
}

/* ===== Scroll Fade-in Animation ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-up:nth-child(2) { transition-delay: 0.08s; }
.fade-in-up:nth-child(3) { transition-delay: 0.16s; }
.fade-in-up:nth-child(4) { transition-delay: 0.24s; }
.fade-in-up:nth-child(5) { transition-delay: 0.32s; }
.fade-in-up:nth-child(6) { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  .fade-in-up {
    opacity: 1;
    transform: none;
    transition: none;
  }
}