:root {
  --color-primary: #E8611A;
  --color-primary-dark: #C14E10;
  --color-accent: #F5A623;
  --color-accent-light: #F7BC5E;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F5F5;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-footer: #1A1A1A;
  --color-footer-text: #AAAAAA;
  --nav-height: 72px;
  --max-width: 1200px;
  --radius: 6px;
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --transition: .3s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ===== Container ===== */
.container { width: 90%; max-width: var(--max-width); margin: 0 auto; }

/* ===== Header / Nav ===== */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%;
  height: var(--nav-height);
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 6px rgba(0,0,0,.06);
  z-index: 1000;
  transition: background var(--transition);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.site-header .logo { height: 44px; }
.site-header .logo img { height: 100%; width: auto; }

.nav-links { display: flex; gap: 6px; }
.nav-links a {
  padding: 8px 18px;
  font-size: .95rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: rgba(232,97,26,.06);
}
.nav-links a.active::after {
  content: '';
  position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
}

.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}
.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); }

/* ===== Hero Banner ===== */
.hero {
  margin-top: var(--nav-height);
  position: relative;
  width: 100%;
  aspect-ratio: 16/7;
  overflow: hidden;
  background: #111;
}
.hero-track {
  display: flex;
  height: 100%;
  transition: transform .6s cubic-bezier(.4,0,.2,1);
}
.hero-slide {
  min-width: 100%; height: 100%;
  position: relative;
}
.hero-slide img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(26,26,26,.55) 0%, rgba(26,26,26,.15) 100%);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; color: #fff;
  padding: 2rem;
}
.hero-overlay .brand-en {
  font-size: .85rem; letter-spacing: 6px;
  text-transform: uppercase; opacity: .8;
  margin-bottom: .5rem;
}
.hero-overlay h1 { font-size: clamp(1.8rem, 4vw, 3.2rem); font-weight: 700; }
.hero-overlay .tagline {
  margin-top: .8rem;
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 300;
  letter-spacing: 3px;
}
.hero-dots {
  position: absolute; bottom: 1.5rem; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 10px;
}
.hero-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,.45);
  cursor: pointer;
  transition: var(--transition);
}
.hero-dots span.active { background: #fff; transform: scale(1.25); }

/* ===== Section Common ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--color-bg-alt); }

.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: '';
  display: block; width: 50px; height: 3px;
  background: var(--color-accent);
  margin: 12px auto 0;
  border-radius: 2px;
}
.section-header p {
  margin-top: 12px;
  color: var(--color-text-light);
  font-size: .95rem;
}

/* ===== Page Banner (sub-pages) ===== */
.page-banner {
  margin-top: var(--nav-height);
  height: 260px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  display: flex; align-items: center; justify-content: center;
  color: #fff; text-align: center;
}
.page-banner h1 { font-size: 2rem; font-weight: 700; }
.page-banner p {
  margin-top: 8px; font-size: .95rem; opacity: .85;
  letter-spacing: 2px;
}

/* ===== Highlight Keywords ===== */
.keyword-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.keyword-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.keyword-card:hover { transform: translateY(-4px); box-shadow: 0 6px 20px rgba(0,0,0,.12); }
.keyword-card .kw-label {
  font-size: .85rem; color: var(--color-accent); font-weight: 600;
  letter-spacing: 2px; margin-bottom: 8px;
}
.keyword-card .kw-text {
  font-size: 1.25rem; font-weight: 700; color: var(--color-primary);
}

/* ===== Tracing Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}
.card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-5px); box-shadow: 0 8px 24px rgba(0,0,0,.12); }
.card .card-img {
  width: 100%; aspect-ratio: 16/10;
  object-fit: cover;
}
.card .card-body { padding: 22px 24px; }
.card .card-body h3 {
  font-size: 1.05rem; font-weight: 600;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
  line-height: 1.5;
}
.card .card-body .card-desc {
  font-size: .88rem; color: var(--color-text-light);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}
.card .card-body .card-date {
  font-size: .82rem; color: #999;
}
.view-more {
  display: inline-block;
  margin-top: 36px;
  padding: 10px 32px;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--radius);
  font-weight: 500;
  transition: var(--transition);
}
.view-more:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ===== Store Grid ===== */
.store-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.store-grid img {
  width: 100%; aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  transition: transform var(--transition);
}
.store-grid img:hover { transform: scale(1.03); }

/* ===== Tabs ===== */
.tabs { margin-top: 20px; }
.tab-nav {
  display: flex; justify-content: center; gap: 4px;
  border-bottom: 2px solid #eee;
  margin-bottom: 30px;
}
.tab-nav button {
  padding: 12px 28px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--color-text-light);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}
.tab-nav button:hover { color: var(--color-primary); }
.tab-nav button.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.tab-panel { display: none; animation: fadeUp .4s ease; }
.tab-panel.active { display: block; }
.tab-panel p { margin-bottom: 1rem; line-height: 1.9; }

/* ===== Values (六心) ===== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.value-item {
  text-align: center;
  padding: 28px 20px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}
.value-item:hover { transform: translateY(-4px); }
.value-item img { width: 56px; height: 56px; margin: 0 auto 14px; }
.value-item h4 { font-size: 1.1rem; color: var(--color-primary); margin-bottom: 6px; }
.value-item p { font-size: .88rem; color: var(--color-text-light); }

/* ===== About Page Sections ===== */
.about-intro { font-size: 1rem; line-height: 2; }
.about-intro p { margin-bottom: 1.2rem; text-indent: 2em; }

.mission-box {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 48px 40px;
  text-align: center;
}
.mission-box h3 { font-size: 1.4rem; margin-bottom: 16px; }
.mission-box p { max-width: 700px; margin: 0 auto; line-height: 1.9; opacity: .92; }

.charity-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.charity-box .charity-text h3 {
  font-size: 1.3rem; margin-bottom: 8px;
}
.charity-box .charity-text .sub {
  color: var(--color-accent); font-size: .9rem; margin-bottom: 16px;
}
.charity-box .charity-text p { line-height: 1.9; color: var(--color-text-light); }
.charity-box .charity-img img { border-radius: var(--radius); }

/* ===== After-sales ===== */
.service-highlight {
  text-align: center;
  padding: 40px 20px;
  background: linear-gradient(135deg, #fef6f0 0%, #fff 100%);
  border-radius: var(--radius);
  border: 1px solid rgba(232,97,26,.08);
}
.service-highlight .phone {
  font-size: 1.5rem; font-weight: 700;
  color: var(--color-primary);
  margin-top: 16px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-footer);
  color: var(--color-footer-text);
  padding: 48px 0 24px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.footer-brand .logo { height: 36px; margin-bottom: 14px; filter: brightness(10); }
.footer-brand .logo img { height: 100%; width: auto; }
.footer-brand p { font-size: .88rem; line-height: 1.8; }
.footer-col h4 {
  color: #fff; font-size: .95rem; margin-bottom: 16px;
  position: relative; padding-bottom: 10px;
}
.footer-col h4::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 24px; height: 2px; background: var(--color-accent);
}
.footer-col a {
  display: block; padding: 5px 0; font-size: .88rem;
  transition: color var(--transition);
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 20px;
  text-align: center;
  font-size: .82rem;
}
.footer-bottom a { color: var(--color-accent); }
.footer-bottom a:hover { text-decoration: underline; }

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .keyword-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .charity-box { grid-template-columns: 1fr; }
  .store-grid { gap: 10px; }
  .hero { aspect-ratio: 16/9; }
}

@media (max-width: 768px) {
  :root { --nav-height: 60px; }

  .nav-links {
    position: fixed; top: var(--nav-height); right: 0;
    width: 260px; height: calc(100vh - var(--nav-height));
    background: #fff;
    flex-direction: column; gap: 0;
    padding: 16px 0;
    box-shadow: -4px 0 20px rgba(0,0,0,.1);
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 999;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { padding: 14px 28px; font-size: 1rem; border-radius: 0; }
  .hamburger { display: flex; }

  .section { padding: 50px 0; }
  .section-header { margin-bottom: 32px; }
  .section-header h2 { font-size: 1.4rem; }
  .page-banner { height: 180px; }
  .page-banner h1 { font-size: 1.5rem; }

  .card-grid { grid-template-columns: 1fr; }
  .keyword-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .values-grid { grid-template-columns: 1fr 1fr; gap: 14px; }

  .tab-nav { flex-wrap: wrap; }
  .tab-nav button { padding: 10px 16px; font-size: .88rem; }

  .mission-box { padding: 32px 20px; }
}

@media (max-width: 480px) {
  .keyword-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .store-grid { grid-template-columns: 1fr; }
  .hero-overlay h1 { font-size: 1.4rem; }
}