/* ============================================
   陶唐智能 · Wuxi TaoTang Smart Tech
   Brand: 朱砂红 #801C1E
   ============================================ */

:root {
  /* Brand */
  --color-primary:        #801C1E;   /* 朱砂红 from logo */
  --color-primary-dark:   #5C1414;
  --color-primary-deep:   #3A0C0C;
  --color-primary-light:  #A93232;
  --color-primary-tint:   #F5E8E8;
  --color-primary-veil:   #FCF6F6;

  /* Accent */
  --color-gold:           #B89968;   /* 古铜金 for Chinese feel */
  --color-gold-dark:      #8A6F45;
  --color-ink:            #1F1A1A;

  /* Neutrals */
  --color-bg:             #FAF6F1;   /* 米黄宣纸 */
  --color-bg-2:           #F3ECE2;
  --color-card:           #FFFFFF;
  --color-line:           #E8DFD2;
  --color-text:           #2A2424;
  --color-text-muted:     #6B5E5E;
  --color-text-faint:     #9E938E;

  /* Typography */
  --font-cn: "Noto Serif SC", "Source Han Serif SC", "思源宋体", "STSong", "宋体", "PingFang SC", "Microsoft YaHei", serif;
  --font-sans: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;

  /* Spacing */
  --gap-1: 4px;
  --gap-2: 8px;
  --gap-3: 12px;
  --gap-4: 16px;
  --gap-5: 24px;
  --gap-6: 32px;
  --gap-7: 48px;
  --gap-8: 64px;
  --gap-9: 96px;

  /* Radius */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 3px rgba(91,20,20,.06), 0 1px 2px rgba(91,20,20,.04);
  --shadow-md: 0 6px 18px -6px rgba(91,20,20,.15), 0 2px 6px rgba(91,20,20,.06);
  --shadow-lg: 0 24px 48px -16px rgba(91,20,20,.18), 0 8px 16px -8px rgba(91,20,20,.10);
  --shadow-red: 0 8px 24px -8px rgba(128,28,30,.45);

  /* Container */
  --container: 1200px;

  /* Transition */
  --ease: cubic-bezier(.2,.7,.2,1);
}

/* ----- Reset ----- */
*,*::before,*::after { box-sizing: border-box; }
html,body { margin:0; padding:0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img,svg { display:block; max-width:100%; height:auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; padding:0; margin:0; }
h1,h2,h3,h4,h5,h6 { margin:0; font-weight: 600; line-height: 1.25; letter-spacing: -0.01em; }
p { margin: 0 0 1em 0; }

/* ----- Container ----- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   NAVBAR
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,246,241,.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo img { height: 44px; width: auto; }
.nav-logo .brand-text {
  font-family: var(--font-cn);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  line-height: 1.1;
}
.nav-logo .brand-sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-menu a {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--r-pill);
  transition: all .2s var(--ease);
  position: relative;
}
.nav-menu a:hover { color: var(--color-primary); background: var(--color-primary-veil); }
.nav-menu a.active {
  color: #fff;
  background: var(--color-primary);
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  border: 1px solid var(--color-line);
  align-items: center;
  justify-content: center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: all .25s var(--ease);
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after  { position: absolute; top:  6px; }

/* Mobile dropdown */
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--color-line);
  background: var(--color-bg);
}
.nav-mobile a {
  display: block;
  padding: 12px 16px;
  border-radius: var(--r-md);
  font-weight: 500;
}
.nav-mobile a.active { background: var(--color-primary); color: #fff; }
.nav.open .nav-mobile { display: flex; }
.nav.open .nav-toggle span { background: transparent; }
.nav.open .nav-toggle span::before { transform: rotate(45deg); top: 0; }
.nav.open .nav-toggle span::after  { transform: rotate(-45deg); top: 0; }

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  padding: 96px 0 80px;
  overflow: hidden;
  background:
    radial-gradient(60% 80% at 100% 0%, rgba(128,28,30,.10), transparent 70%),
    radial-gradient(50% 70% at 0% 100%, rgba(184,153,104,.12), transparent 70%),
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-2) 100%);
  border-bottom: 1px solid var(--color-line);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(45deg, transparent 0 60px, rgba(128,28,30,.025) 60px 61px);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 64px;
  align-items: center;
  position: relative;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 8px;
  background: var(--color-primary-veil);
  border: 1px solid rgba(128,28,30,.18);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}
.hero-eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(128,28,30,.15);
  animation: pulse 1.6s ease-in-out infinite;
}
.hero h1 {
  font-family: var(--font-cn);
  font-size: clamp(36px, 4.4vw, 56px);
  color: var(--color-ink);
  margin: 18px 0 18px;
  letter-spacing: -0.02em;
}
.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
  position: relative;
  white-space: nowrap;
}
.hero h1 em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 8px;
  background: linear-gradient(90deg, rgba(128,28,30,.18), transparent);
  z-index: -1;
  border-radius: 4px;
}
.hero p.lead {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 540px;
  margin-bottom: 32px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-meta {
  display: flex; gap: 36px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px dashed var(--color-line);
}
.hero-meta .stat .num {
  font-family: var(--font-cn);
  font-size: 30px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
}
.hero-meta .stat .lbl {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 460px;
  margin-left: auto;
}
.hero-card {
  position: absolute;
  background: var(--color-card);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px;
  border: 1px solid var(--color-line);
}
.hero-card.main {
  inset: 8% 0 8% 0;
  display: flex; flex-direction: column; justify-content: center;
}
.hero-card.main .icon-wrap {
  width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  margin-bottom: 16px;
  box-shadow: var(--shadow-red);
}
.hero-card.main h3 { font-family: var(--font-cn); font-size: 22px; margin-bottom: 6px; }
.hero-card.main .loc { font-size: 14px; color: var(--color-text-muted); }

.hero-card.floating {
  width: 220px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 18px;
}
.hero-card.floating.top    { top: -10px; right: -10px; }
.hero-card.floating.bottom { bottom: -10px; left: -10px; background: var(--color-card); color: var(--color-text); }
.hero-card.floating .label { font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; opacity: .8; }
.hero-card.floating .value { font-family: var(--font-cn); font-size: 28px; font-weight: 600; margin-top: 4px; }
.hero-card.floating .desc { font-size: 12px; margin-top: 6px; opacity: .85; }

.hero-decoration {
  position: absolute;
  width: 360px; height: 360px;
  border-radius: 50%;
  border: 1px dashed rgba(128,28,30,.18);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 0;
}
.hero-decoration::before, .hero-decoration::after {
  content: ""; position: absolute; inset: 30px;
  border: 1px dashed rgba(128,28,30,.12);
  border-radius: 50%;
}
.hero-decoration::after { inset: 80px; border-color: rgba(184,153,104,.2); }

/* ============================================
   BUTTON
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all .25s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-red);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -8px rgba(128,28,30,.55);
}
.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-ghost:hover { background: var(--color-primary); color: #fff; }
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ============================================
   SECTION
   ============================================ */
.section {
  padding: 96px 0;
  position: relative;
}
.section-sm { padding: 64px 0; }
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}
.section-eyebrow {
  display: inline-block;
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin-bottom: 14px;
  position: relative;
}
.section-eyebrow::before,
.section-eyebrow::after {
  content: "";
  display: inline-block;
  width: 30px; height: 1px;
  background: var(--color-primary);
  vertical-align: middle;
  margin: 0 14px;
}
.section h2 {
  font-family: var(--font-cn);
  font-size: clamp(28px, 3vw, 40px);
  color: var(--color-ink);
  margin-bottom: 16px;
}
.section .lede {
  font-size: 17px;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
}

.section-divider {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  margin-bottom: 24px;
}
.section-divider .line { width: 60px; height: 1px; background: var(--color-primary); }
.section-divider .dot { width: 6px; height: 6px; background: var(--color-primary); transform: rotate(45deg); }

/* Alternating bg */
.section-alt { background: var(--color-bg-2); }

/* ============================================
   GRID/CARDS
   ============================================ */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.card {
  background: var(--color-card);
  border-radius: var(--r-lg);
  border: 1px solid var(--color-line);
  padding: 32px;
  transition: all .3s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(128,28,30,.2);
}
.card-icon {
  width: 56px; height: 56px;
  background: var(--color-primary-veil);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
  transition: all .3s var(--ease);
}
.card:hover .card-icon { background: var(--color-primary); color: #fff; }
.card h3 {
  font-family: var(--font-cn);
  font-size: 20px;
  margin-bottom: 10px;
}
.card p { color: var(--color-text-muted); margin-bottom: 16px; font-size: 15px; }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}
.card-link .arrow { transition: transform .25s var(--ease); }
.card-link:hover .arrow { transform: translateX(4px); }

/* Feature */
.feature {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 36px 28px;
  background: var(--color-card);
  border-radius: var(--r-lg);
  border-top: 4px solid var(--color-primary);
  position: relative;
  transition: all .3s var(--ease);
}
.feature:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.feature .num {
  position: absolute; top: 24px; right: 28px;
  font-family: var(--font-cn);
  font-size: 42px;
  font-weight: 600;
  color: var(--color-primary-tint);
  line-height: 1;
}
.feature h3 { font-family: var(--font-cn); font-size: 20px; margin-bottom: 12px; }
.feature p { color: var(--color-text-muted); font-size: 15px; }

/* Product card (large) */
.product-card {
  background: var(--color-card);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--color-line);
  transition: all .3s var(--ease);
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-card .thumb {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-primary-tint), var(--color-bg-2));
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.product-card .thumb svg { color: var(--color-primary); }
.product-card .body { padding: 28px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-family: var(--font-cn); font-size: 22px; margin-bottom: 10px; }
.product-card p { color: var(--color-text-muted); font-size: 15px; flex: 1; }
.product-card .meta {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin: 14px 0 20px;
}
.product-card .meta span {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: var(--color-primary-veil);
  color: var(--color-primary);
}

/* Case */
.case-card {
  background: var(--color-card);
  border-radius: var(--r-lg);
  padding: 32px;
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-primary);
}
.case-card .tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 14px;
}
.case-card h3 { font-family: var(--font-cn); font-size: 22px; margin-bottom: 12px; }
.case-card p { color: var(--color-text-muted); margin-bottom: 18px; }
.case-card .case-meta {
  display: flex; gap: 20px; flex-wrap: wrap;
  padding-top: 18px; border-top: 1px dashed var(--color-line);
  font-size: 13px; color: var(--color-text-muted);
}
.case-card .case-meta strong { color: var(--color-text); display: block; margin-bottom: 4px; font-weight: 600; }

/* Honors */
.honor {
  background: var(--color-card);
  border-radius: var(--r-md);
  padding: 20px 16px;
  text-align: center;
  border: 1px solid var(--color-line);
  transition: all .3s var(--ease);
}
.honor:hover { border-color: var(--color-primary); }
.honor svg { color: var(--color-primary); margin: 0 auto 12px; }
.honor .label { font-size: 14px; font-weight: 500; }

/* ============================================
   PAGE HEADER (Tier 2 / Tier 3)
   ============================================ */
.page-header {
  padding: 80px 0 56px;
  background:
    radial-gradient(50% 70% at 50% 0%, var(--color-primary-veil), transparent 70%),
    linear-gradient(180deg, var(--color-bg), var(--color-bg-2));
  border-bottom: 1px solid var(--color-line);
  position: relative;
  text-align: center;
}
.page-header h1 {
  font-family: var(--font-cn);
  font-size: clamp(32px, 3.6vw, 48px);
  color: var(--color-ink);
  margin-bottom: 16px;
}
.page-header p {
  max-width: 720px;
  margin: 0 auto;
  font-size: 17px;
  color: var(--color-text-muted);
}
.breadcrumb {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { opacity: .4; }

/* Sub-nav for Tier 2 pages listing Tier 3 children */
.subnav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: -28px auto 56px;
  max-width: 980px;
  padding: 8px;
  background: var(--color-card);
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-line);
  position: relative;
  z-index: 2;
}
.subnav a {
  padding: 10px 22px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: all .2s var(--ease);
}
.subnav a:hover { background: var(--color-primary-veil); color: var(--color-primary); }
.subnav a.active { background: var(--color-primary); color: #fff; }

/* ============================================
   DETAIL PAGE (Tier 3)
   ============================================ */
.detail-hero {
  padding: 80px 0 56px;
  background:
    radial-gradient(60% 80% at 100% 0%, rgba(128,28,30,.08), transparent 70%),
    var(--color-bg);
  border-bottom: 1px solid var(--color-line);
  position: relative;
  overflow: hidden;
}
.detail-hero .container {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 56px;
  align-items: center;
}
.detail-hero h1 {
  font-family: var(--font-cn);
  font-size: clamp(32px, 3.6vw, 48px);
  color: var(--color-ink);
  margin-bottom: 20px;
  line-height: 1.2;
}
.detail-hero .quick-info {
  display: flex; flex-wrap: wrap; gap: 18px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px dashed var(--color-line);
}
.detail-hero .quick-info .item {
  display: flex; flex-direction: column;
}
.detail-hero .quick-info .item .lbl {
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.detail-hero .quick-info .item .val {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 4px;
}
.detail-visual {
  aspect-ratio: 1.05 / 1;
  background: linear-gradient(135deg, var(--color-primary-tint), #fff);
  border-radius: var(--r-xl);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-line);
  position: relative;
  overflow: hidden;
}
.detail-visual::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 80% 20%, rgba(128,28,30,.08), transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(184,153,104,.12), transparent 50%);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.feature-list .item {
  display: flex; gap: 16px;
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--color-bg);
  border: 1px solid var(--color-line);
}
.feature-list .item .num {
  flex: 0 0 36px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600;
  font-size: 14px;
}
.feature-list .item h4 { font-size: 16px; margin-bottom: 4px; }
.feature-list .item p { font-size: 14px; color: var(--color-text-muted); margin: 0; }

/* Spec table */
.spec-table {
  background: var(--color-card);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--color-line);
}
.spec-table .row {
  display: grid;
  grid-template-columns: 200px 1fr;
  border-bottom: 1px solid var(--color-line);
}
.spec-table .row:last-child { border-bottom: none; }
.spec-table .row > div {
  padding: 16px 24px;
}
.spec-table .row .key {
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 14px;
}
.spec-table .row .val {
  color: var(--color-text);
  font-size: 14px;
}

/* Timeline / Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step;
  position: relative;
}
.steps::before {
  content: ""; position: absolute;
  top: 28px; left: 8%; right: 8%;
  height: 2px;
  background: var(--color-primary-tint);
  z-index: 0;
}
.step {
  counter-increment: step;
  text-align: center;
  position: relative;
  z-index: 1;
}
.step .circle {
  width: 56px; height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--color-card);
  border: 2px solid var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-cn);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 18px;
  position: relative;
}
.step .circle::before {
  content: counter(step);
}
.step h4 { font-size: 16px; margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--color-text-muted); }

/* FAQ */
.faq { max-width: 800px; margin: 0 auto; }
.faq details {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--r-md);
  margin-bottom: 12px;
  transition: all .25s var(--ease);
}
.faq details[open] { border-color: var(--color-primary); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 24px;
  font-weight: 600;
  display: flex; justify-content: space-between; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  color: var(--color-primary);
  font-size: 22px;
  font-weight: 300;
  transition: transform .25s var(--ease);
}
.faq details[open] summary::after { content: "−"; }
.faq details > *:not(summary) { padding: 0 24px 20px; color: var(--color-text-muted); font-size: 15px; }

/* CTA Strip */
.cta-strip {
  background: linear-gradient(135deg, var(--color-primary-veil), #FFFFFF);
  border-radius: var(--r-xl);
  padding: 56px 48px;
  text-align: center;
  color: var(--color-text);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-card);
}
.cta-strip::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, transparent 0%, var(--color-primary) 50%, transparent 100%);
  opacity: .6;
}
.cta-strip h2 { font-family: var(--font-cn); font-size: 30px; margin-bottom: 14px; color: var(--color-text); }
.cta-strip p { color: var(--color-text-muted); margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-strip .btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-red);
}
.cta-strip .btn-primary:hover { background: var(--color-primary-dark); }
.cta-strip .btn-ghost {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.cta-strip .btn-ghost:hover { background: var(--color-primary); color: #fff; }

/* Contact Form */
.contact-form {
  background: var(--color-card);
  border-radius: var(--r-lg);
  padding: 36px;
  border: 1px solid var(--color-line);
}
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.contact-form label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}
.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--r-md);
  font: inherit;
  background: var(--color-bg);
  transition: all .2s var(--ease);
}
.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(128,28,30,.1);
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form button[type=submit] { width: 100%; margin-top: 8px; }

.contact-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.contact-card {
  background: var(--color-card);
  border-radius: var(--r-lg);
  padding: 24px;
  border: 1px solid var(--color-line);
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.contact-card svg { color: var(--color-primary); flex-shrink: 0; }
.contact-card h4 { font-size: 16px; margin-bottom: 4px; }
.contact-card p { font-size: 14px; color: var(--color-text-muted); margin: 0; line-height: 1.5; }
.contact-card a { color: inherit; border-bottom: 1px dotted rgba(158,147,142,.7); transition: color .2s; }
.contact-card a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-bg) 100%);
  color: var(--color-text);
  padding: 64px 0 28px;
  position: relative;
  border-top: 1px solid var(--color-line);
}
.footer::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(50% 70% at 100% 0%, rgba(128,28,30,.04), transparent 70%),
    radial-gradient(40% 60% at 0% 100%, rgba(184,153,104,.07), transparent 70%);
  pointer-events: none;
}
.footer::after {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, transparent 0%, var(--color-primary) 50%, transparent 100%);
  opacity: .55;
}
.footer .container { position: relative; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 36px;
}
.footer-brand .footer-logo {
  height: 48px;
  margin-bottom: 14px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: 18px;
  max-width: 340px;
}
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: #fff;
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  transition: all .25s var(--ease);
  border: 1px solid var(--color-line);
}
.footer-social a:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-red);
}
.footer h5 {
  font-family: var(--font-cn);
  font-size: 15px;
  margin-bottom: 18px;
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: 0.05em;
  position: relative;
  padding-bottom: 10px;
}
.footer h5::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 24px; height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}
.footer ul li { margin-bottom: 10px; }
.footer ul li a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color .2s var(--ease);
}
.footer ul li a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-line);
  padding-top: 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  font-size: 13px;
  color: var(--color-text-faint);
}
.footer-bottom a:hover { color: var(--color-primary); }
@media (max-width: 720px) {
  .footer { padding: 48px 0 24px; }
  .footer-grid { gap: 32px 24px; }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* 无障碍：用户偏好减少动效时，直接显示全部内容 */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { margin: 0 auto; max-width: 360px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .detail-hero .container { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .steps::before { display: none; }
}
@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-menu { display: none; }
  .section, .hero { padding: 56px 0; }
  .section { padding: 56px 0; }
  .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .spec-table .row { grid-template-columns: 1fr; }
  .spec-table .row .key { padding-bottom: 4px; }
  .spec-table .row .val { padding-top: 0; }
  .hero-meta { gap: 20px; flex-wrap: wrap; }
  .cta-strip { padding: 40px 24px; }
  .cta-strip h2 { font-size: 22px; }
  .contact-form .row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .subnav { margin: -20px 16px 40px; border-radius: var(--r-lg); flex-direction: column; align-items: stretch; }
  .subnav a { text-align: center; }
  .hero-card.floating { width: 160px; padding: 12px; }
  .hero-card.floating .value { font-size: 20px; }
}

/* ============================================
   PRODUCT IMAGES & CERTIFICATES
   ============================================ */
.detail-visual img {
  position: relative;
  z-index: 1;
  width: 88%;
  height: 88%;
  object-fit: contain;
  border-radius: var(--r-md);
}

.product-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 20px;
  transition: transform .4s var(--ease);
}
.product-card:hover .thumb img { transform: scale(1.06); }

/* 证书墙 */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.cert-item {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: all .3s var(--ease);
}
.cert-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(128,28,30,.25);
}
.cert-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: #fff;
}
.cert-item .cap {
  padding: 12px 14px;
  font-size: 13px;
  text-align: center;
  color: var(--color-text-muted);
}

/* 照片框 */
.photo-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-md);
}
.photo-frame img { width: 100%; display: block; }

@media (max-width: 1024px) {
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .cert-grid { grid-template-columns: 1fr; }
}

/* ============================================
   AI 视觉方案 · 新增组件
   ============================================ */
/* 全宽横幅入口卡（解决方案 / 产品中心推荐位） */
.wide-feature {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 400px 1fr;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all .3s var(--ease);
  text-decoration: none;
  color: inherit;
}
.wide-feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.wide-feature .wf-media {
  background: linear-gradient(135deg, var(--color-primary-tint), var(--color-bg-2));
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  min-height: 240px;
  position: relative;
}
.wide-feature .wf-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s var(--ease); }
.wide-feature:hover .wf-media img { transform: scale(1.04); }
.wide-feature .wf-body { padding: 36px 40px; display: flex; flex-direction: column; justify-content: center; }
.wide-feature .wf-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: 12px; font-weight: 600;
}
.wide-feature .wf-tag::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-primary); opacity: .7;
}
.wide-feature h3 { font-family: var(--font-cn); font-size: 25px; margin-bottom: 10px; }
.wide-feature p { color: var(--color-text-muted); font-size: 15px; margin-bottom: 16px; }
.wide-feature .meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 22px; }
.wide-feature .meta span {
  font-size: 12px; padding: 4px 10px; border-radius: var(--r-pill);
  background: var(--color-primary-veil); color: var(--color-primary);
}
.wide-feature .card-link { font-weight: 600; color: var(--color-primary); font-size: 15px; }
.wide-feature .card-link .arrow { display: inline-block; transition: transform .25s var(--ease); }
.wide-feature:hover .card-link .arrow { transform: translateX(4px); }

/* 视觉方案产品清单条目 */
.vision-row {
  display: grid;
  grid-template-columns: 340px 1fr;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: 24px;
  transition: all .3s var(--ease);
}
.vision-row:hover { box-shadow: var(--shadow-md); border-color: rgba(128,28,30,.28); }
.vision-row .vr-media {
  background: linear-gradient(160deg, #fff, var(--color-primary-veil));
  border-right: 1px solid var(--color-line);
  display: flex; align-items: center; justify-content: center;
  padding: 24px; min-height: 240px; overflow: hidden;
}
.vision-row .vr-media img { max-height: 230px; max-width: 100%; width: auto; object-fit: contain; }
.vision-row .vr-body { padding: 28px 32px; }
.vision-row .vr-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.vision-row .vr-idx {
  font-size: 12px; font-weight: 700; letter-spacing: .15em;
  color: var(--color-text-faint);
}
.vision-row h3 { font-family: var(--font-cn); font-size: 21px; }
.vision-row .vr-role {
  font-size: 12.5px; color: var(--color-primary);
  background: var(--color-primary-veil);
  padding: 3px 12px; border-radius: var(--r-pill);
}
.vision-row .vr-body > p { color: var(--color-text-muted); font-size: 15px; margin-bottom: 16px; }
.vision-row .vr-specs {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 10px 28px;
  padding-top: 16px; border-top: 1px dashed var(--color-line);
}
.vision-row .vr-specs .spec {
  display: flex; gap: 8px; font-size: 13.5px; color: var(--color-text-muted);
  line-height: 1.5;
}
.vision-row .vr-specs .spec strong {
  color: var(--color-text); font-weight: 600; white-space: nowrap; flex-shrink: 0;
}
.vision-row .vr-specs .spec em { font-style: normal; }

/* 指标徽章 */
.metric-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.metric-card {
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--r-lg); padding: 26px 24px; text-align: center;
}
.metric-card .num {
  font-family: var(--font-cn); font-size: 34px; font-weight: 700;
  color: var(--color-primary); margin-bottom: 6px;
}
.metric-card .lbl { font-size: 14px; font-weight: 500; }
.metric-card .desc { font-size: 12.5px; color: var(--color-text-faint); margin-top: 4px; }

@media (max-width: 1024px) {
  .wide-feature { grid-template-columns: 1fr; }
  .wide-feature .wf-media { min-height: 200px; max-height: 240px; }
  .vision-row { grid-template-columns: 1fr; }
  .vision-row .vr-media { border-right: none; border-bottom: 1px solid var(--color-line); min-height: 200px; }
  .metric-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .vision-row .vr-specs { grid-template-columns: 1fr; }
  .metric-strip { grid-template-columns: 1fr; }
  .wide-feature .wf-body { padding: 26px 24px; }
}