/* roulang page: index */
/* ===== Design Tokens ===== */
:root {
  --color-bg: #F5F6F8;
  --color-surface: #FFFFFF;
  --color-surface-alt: #1E2126;
  --color-primary: #E8590C;
  --color-primary-dark: #C2410C;
  --color-accent: #F1B678;
  --color-border: #D8DCE3;
  --color-text: #191C20;
  --color-text-secondary: #5A6472;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --shadow-sm: 0 2px 8px rgba(20,24,32,0.06);
  --shadow-lg: 0 12px 28px rgba(20,24,32,0.10);
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 96px;
  --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-stack);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--color-primary);
}
ul, ol {
  list-style: none;
}
button, input {
  font-family: inherit;
  font-size: inherit;
}
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px;
}
.section {
  padding: 96px 0;
}
.section-head {
  margin-bottom: 48px;
  max-width: 720px;
}
.section-head .tagline {
  display: inline-block;
  background: rgba(232, 89, 12, 0.08);
  color: var(--color-primary-dark);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--color-text);
}
.section-head p {
  color: var(--color-text-secondary);
  font-size: 16px;
}
.text-center {
  text-align: center;
}
.text-primary {
  color: var(--color-primary);
}
.text-secondary {
  color: var(--color-text-secondary);
}
/* ===== Button ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  line-height: 1.2;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translate(1px, -1px);
  box-shadow: 0 4px 12px rgba(232, 89, 12, 0.3);
}
.btn-primary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.6);
  color: #fff;
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}
.btn-outline:focus-visible {
  outline: 2px solid rgba(255,255,255,0.8);
  outline-offset: 2px;
}
.btn-dark {
  background: var(--color-surface-alt);
  color: #fff;
}
.btn-dark:hover {
  background: #2A2E34;
  color: #fff;
  transform: translate(1px, -1px);
}
.btn-large {
  padding: 16px 36px;
  font-size: 18px;
}
.btn-block {
  display: flex;
  width: 100%;
}

/* ===== Header ===== */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.top-bar {
  background: var(--color-surface-alt);
  color: rgba(255,255,255,0.8);
  font-size: 13px;
  padding: 8px 0;
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 32px;
}
.top-bar .service-info {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.9);
}
.top-bar .service-info svg {
  flex-shrink: 0;
}
.header-main {
  background: var(--color-surface);
}
.header-main .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}
.logo-text .logo-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}
.logo-text .logo-sub {
  font-size: 12px;
  color: var(--color-text-secondary);
  letter-spacing: 0.5px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover {
  color: var(--color-primary);
}
.main-nav a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.nav-cta {
  margin-left: 16px;
}
.burger-menu {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}
.burger-menu span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s ease;
}
.burger-menu.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.burger-menu.active span:nth-child(2) {
  opacity: 0;
}
.burger-menu.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Mobile Nav ===== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-surface);
  z-index: 99;
  padding: 96px 32px 32px;
  overflow-y: auto;
}
.mobile-nav.open {
  display: block;
}
.mobile-nav a {
  display: block;
  font-size: 20px;
  font-weight: 600;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav .btn {
  margin-top: 24px;
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  background: var(--color-surface-alt);
  color: #fff;
  position: relative;
  padding: 72px 0;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 40%;
  height: 120%;
  background: linear-gradient(135deg, transparent 0%, rgba(232,89,12,0.08) 100%);
  transform: skewX(-15deg);
}
.hero .container {
  position: relative;
  z-index: 2;
}
.hero-bento {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: stretch;
}
.hero-main {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backdrop-filter: blur(4px);
}
.hero-main h1 {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  color: #fff;
}
.hero-main h1 .highlight {
  color: var(--color-accent);
}
.hero-main p {
  font-size: 17px;
  color: rgba(255,255,255,0.75);
  max-width: 480px;
  margin-bottom: 32px;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-side {
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 32px;
}
.hero-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: background 0.3s ease;
}
.hero-card:hover {
  background: rgba(255,255,255,0.1);
}
.hero-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-card h3 svg {
  color: var(--color-accent);
}
.hero-card p {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
}
.hero-card .hero-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-accent);
  margin-top: 12px;
}
.hero-cta-strip {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-cta-strip h3 {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
.hero-cta-strip p {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
}

/* ===== Advantages ===== */
.advantages {
  background: var(--color-bg);
}
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.advantage-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 32px;
  transition: all 0.3s ease;
  border-top: 3px solid var(--color-primary);
}
.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(232, 89, 12, 0.3);
}
.advantage-icon {
  width: 48px;
  height: 48px;
  background: rgba(232, 89, 12, 0.08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
}
.advantage-icon svg {
  width: 24px;
  height: 24px;
}
.advantage-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.advantage-card p {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ===== Product Categories ===== */
.product-categories {
  background: var(--color-surface);
}
.cats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.cat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
}
.cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.cat-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.cat-body {
  padding: 24px;
}
.cat-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.cat-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}
.cat-body .badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.badge {
  display: inline-block;
  background: rgba(241, 182, 120, 0.15);
  color: var(--color-primary-dark);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}
.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

/* ===== News / Info ===== */
.news-list {
  background: var(--color-bg);
}
.news-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: start;
}
.news-main h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.news-main h4 span {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-secondary);
  border-bottom: none;
  padding: 0;
}
.news-list-items {
  display: flex;
  flex-direction: column;
}
.news-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
}
.news-item:last-child {
  border-bottom: none;
}
.news-item .news-title {
  font-size: 16px;
  font-weight: 500;
}
.news-item .news-title a {
  color: var(--color-text);
}
.news-item .news-title a:hover {
  color: var(--color-primary);
}
.news-item .news-date {
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}
.news-side {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: 96px;
}
.news-side h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
}
.news-side .side-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 12px;
  align-items: baseline;
}
.news-side .side-item:last-child {
  border-bottom: none;
}
.news-side .side-item .arrow {
  color: var(--color-primary);
  font-weight: 700;
}
.news-side .side-item a {
  font-size: 14px;
  line-height: 1.5;
}

/* ===== Stats ===== */
.stats-section {
  background: linear-gradient(135deg, #16181C 0%, #1E2126 100%);
  color: #fff;
  text-align: center;
  padding: 64px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}
.stat-item {
  position: relative;
}
.stat-number {
  font-size: 48px;
  font-weight: 700;
  font-family: "DIN Alternate", "Rajdhani", var(--font-stack);
  color: var(--color-accent);
  line-height: 1.1;
}
.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  margin-top: 8px;
}
.stat-divider {
  width: 32px;
  height: 2px;
  background: var(--color-accent);
  margin: 16px auto;
}

/* ===== Testimonials ===== */
.testimonials {
  background: var(--color-surface);
}
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.testimonial-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s ease;
}
.testimonial-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(232, 89, 12, 0.3);
}
.testimonial-card blockquote {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
  margin-bottom: 24px;
}
.testimonial-card blockquote::before {
  content: "\201C";
  font-size: 40px;
  color: var(--color-primary);
  display: block;
  margin-bottom: 8px;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.avatar {
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-surface-alt);
}
.testimonial-author .author-info {
  display: flex;
  flex-direction: column;
}
.author-info .author-name {
  font-weight: 600;
  font-size: 15px;
}
.author-info .author-role {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ===== FAQ ===== */
.faq-section {
  background: var(--color-bg);
}
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item.active {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  transition: color 0.3s;
}
.faq-question:hover {
  color: var(--color-primary);
}
.faq-icon {
  font-size: 24px;
  line-height: 1;
  transition: transform 0.3s ease;
  color: var(--color-primary);
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-answer p {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  text-align: center;
  padding: 64px 0;
}
.cta-section h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 16px;
  color: rgba(255,255,255,0.9);
  max-width: 600px;
  margin: 0 auto 32px;
}
.cta-section .btn-outline {
  border-color: rgba(255,255,255,0.8);
  color: #fff;
}
.cta-section .btn-outline:hover {
  background: rgba(255,255,255,0.15);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-surface-alt);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 24px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-brand .logo {
  margin-bottom: 12px;
}
.footer-brand .logo-text .logo-title {
  color: #fff;
}
.footer-brand p {
  line-height: 1.7;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-col a {
  color: rgba(255,255,255,0.6);
}
.footer-col a:hover {
  color: var(--color-accent);
}
.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.footer-contact-item svg {
  color: var(--color-accent);
  flex-shrink: 0;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  text-align: center;
  color: rgba(255,255,255,0.4);
  font-size: 13px;
}

/* ===== Inquiry Form (used in footer/cta) ===== */
.inquiry-form {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-lg);
}
.inquiry-form h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}
.form-group {
  margin-bottom: 16px;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 15px;
  background: var(--color-bg);
  transition: border 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(232, 89, 12, 0.1);
}
.form-group input::placeholder {
  color: #9AA4B0;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-bento {
    grid-template-columns: 1fr;
  }
  .hero-side {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: none;
  }
  .hero-cta-strip {
    grid-column: 1;
    flex-direction: column;
    text-align: center;
  }
  .cats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonial-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .news-side {
    position: static;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .container {
    padding: 0 20px;
  }
  .section {
    padding: 64px 0;
  }
  .main-nav {
    display: none;
  }
  .burger-menu {
    display: flex;
  }
  .header-main .container {
    min-height: 64px;
  }
  .logo-text .logo-title {
    font-size: 18px;
  }
  .hero {
    padding: 48px 0;
  }
  .hero-main {
    padding: 28px;
  }
  .hero-main h1 {
    font-size: 32px;
  }
  .hero-ctas {
    flex-direction: column;
  }
  .hero-ctas .btn {
    width: 100%;
  }
  .hero-side {
    grid-template-columns: 1fr;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .cats-grid {
    grid-template-columns: 1fr;
  }
  .testimonial-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .stat-number {
    font-size: 40px;
  }
  .news-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .cta-section h2 {
    font-size: 26px;
  }
}

@media (max-width: 520px) {
  .hero-main h1 {
    font-size: 26px;
  }
  .section-head h2 {
    font-size: 24px;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --color-bg: #F5F6F8;
            --color-surface: #FFFFFF;
            --color-surface-alt: #1E2126;
            --color-primary: #E8590C;
            --color-primary-dark: #C2410C;
            --color-accent: #F1B678;
            --color-border: #D8DCE3;
            --color-text: #191C20;
            --color-text-secondary: #5A6472;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 12px;
            --shadow-sm: 0 2px 8px rgba(20, 24, 32, 0.06);
            --shadow-lg: 0 12px 28px rgba(20, 24, 32, 0.10);
            --space-sm: 16px;
            --space-md: 24px;
            --space-lg: 48px;
            --space-xl: 96px;
            --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-stack);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: var(--color-text);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--color-primary);
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }
        ul {
            list-style: none;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .section {
            padding: 96px 0;
        }
        .section-head {
            margin-bottom: 48px;
            max-width: 720px;
        }
        .section-head .tagline {
            display: inline-block;
            background: rgba(232, 89, 12, 0.08);
            color: var(--color-primary-dark);
            font-size: 14px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 16px;
        }
        .section-head h2 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 12px;
            color: var(--color-text);
        }
        .section-head p {
            color: var(--color-text-secondary);
            font-size: 16px;
        }
        .text-center {
            text-align: center;
        }
        .text-primary {
            color: var(--color-primary);
        }
        .text-secondary {
            color: var(--color-text-secondary);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
            line-height: 1.2;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
            text-align: center;
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translate(1px, -1px);
            box-shadow: 0 4px 12px rgba(232, 89, 12, 0.3);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .btn-outline {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.6);
            color: #fff;
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }
        .btn-outline:focus-visible {
            outline: 2px solid rgba(255, 255, 255, 0.8);
            outline-offset: 2px;
        }
        .btn-dark {
            background: var(--color-surface-alt);
            color: #fff;
        }
        .btn-dark:hover {
            background: #2A2E34;
            color: #fff;
            transform: translate(1px, -1px);
        }
        .btn-light {
            background: #fff;
            color: var(--color-primary-dark);
        }
        .btn-light:hover {
            background: var(--color-accent);
            color: var(--color-primary-dark);
            transform: translate(1px, -1px);
        }
        .btn-large {
            padding: 16px 36px;
            font-size: 18px;
        }
        .btn-block {
            display: flex;
            width: 100%;
        }

        /* ===== Header ===== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 8px rgba(20, 24, 32, 0.04);
        }
        .top-bar {
            background: var(--color-surface-alt);
            color: rgba(255, 255, 255, 0.85);
            font-size: 13px;
        }
        .top-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 32px;
            padding-top: 4px;
            padding-bottom: 4px;
        }
        .service-info {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-main {
            background: var(--color-surface);
        }
        .header-main .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 18px;
            font-style: normal;
        }
        .logo-text .logo-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-text);
            line-height: 1.2;
            display: block;
        }
        .logo-text .logo-sub {
            font-size: 12px;
            color: var(--color-text-secondary);
            letter-spacing: 0.5px;
            display: block;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .main-nav a {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            padding: 8px 0;
            border-bottom: 2px solid transparent;
            white-space: nowrap;
        }
        .main-nav a:hover {
            color: var(--color-primary);
        }
        .main-nav a.active {
            color: var(--color-primary);
            border-bottom-color: var(--color-primary);
        }
        .nav-cta {
            margin-left: 8px;
            padding: 10px 20px !important;
            border-bottom: none !important;
            font-size: 14px !important;
        }
        .burger-menu {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        .burger-menu span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            transition: all 0.3s ease;
        }
        .burger-menu.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .burger-menu.active span:nth-child(2) {
            opacity: 0;
        }
        .burger-menu.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== 移动导航 ===== */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--color-surface);
            z-index: 99;
            padding: 96px 32px 32px;
            overflow-y: auto;
        }
        .mobile-nav.open {
            display: block;
        }
        .mobile-nav a {
            display: block;
            font-size: 20px;
            font-weight: 600;
            padding: 16px 0;
            border-bottom: 1px solid var(--color-border);
            color: var(--color-text);
        }
        .mobile-nav a:hover {
            color: var(--color-primary);
        }
        .mobile-nav a.active {
            color: var(--color-primary);
        }
        .mobile-nav .btn {
            margin-top: 24px;
            width: 100%;
        }

        /* ===== 页面标题带 ===== */
        .page-hero {
            background: var(--color-surface-alt);
            background-image: linear-gradient(rgba(20, 22, 28, 0.88), rgba(20, 22, 28, 0.94)), url('/assets/images/backpic/back-2.jpg');
            background-size: cover;
            background-position: center 40%;
            color: #fff;
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }
        .page-hero::after {
            content: "";
            position: absolute;
            top: 0;
            right: -5%;
            width: 350px;
            height: 100%;
            background: linear-gradient(135deg, transparent 0%, rgba(232, 89, 12, 0.12) 100%);
            transform: skewX(-15deg);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
            transition: color 0.2s;
        }
        .breadcrumb a:hover {
            color: var(--color-accent);
        }
        .breadcrumb .sep {
            opacity: 0.5;
        }
        .page-hero h1 {
            font-size: 42px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 16px;
            max-width: 720px;
        }
        .page-hero h1 .highlight {
            color: var(--color-accent);
        }
        .page-hero-desc {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 760px;
            line-height: 1.8;
            margin-bottom: 36px;
        }
        .page-hero-stats {
            display: flex;
            gap: 40px;
            flex-wrap: wrap;
        }
        .hero-stat {
            border-left: 3px solid var(--color-primary);
            padding-left: 16px;
        }
        .hero-stat .num {
            font-size: 30px;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            font-family: "Rajdhani", "DIN Alternate", sans-serif;
        }
        .hero-stat .label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
        }

        /* ===== 分类筛选条 ===== */
        .grade-filter {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 24px 0;
            position: sticky;
            top: 105px;
            z-index: 50;
            box-shadow: 0 2px 8px rgba(20, 24, 32, 0.04);
        }
        .filter-tabs {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .filter-tab {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 999px;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            cursor: default;
            transition: all 0.2s ease;
        }
        .filter-tab.active {
            background: var(--color-surface-alt);
            color: #fff;
            border-color: var(--color-surface-alt);
        }
        .filter-tab:not(.active):hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
        }
        .filter-tab .filter-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-accent);
            opacity: 0.7;
        }
        .filter-tab.active .filter-dot {
            background: var(--color-accent);
            opacity: 1;
        }

        /* ===== 牌号卡片网格 ===== */
        .grade-grid-section {
            padding: 72px 0 96px;
        }
        .grade-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grade-card {
            background: var(--color-surface);
            border: 1px solid #E3E7ED;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all 0.25s ease;
            display: flex;
            flex-direction: column;
        }
        .grade-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(232, 89, 12, 0.3);
        }
        .grade-card-img {
            position: relative;
            height: 200px;
            overflow: hidden;
            background: #E8EAEE;
        }
        .grade-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .grade-card:hover .grade-card-img img {
            transform: scale(1.04);
        }
        .grade-cat {
            position: absolute;
            top: 14px;
            left: 14px;
            background: rgba(30, 33, 38, 0.85);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            backdrop-filter: blur(4px);
        }
        .grade-card-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .grade-card-head {
            display: flex;
            align-items: baseline;
            gap: 10px;
            margin-bottom: 14px;
        }
        .grade-card-head h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-text);
            line-height: 1.2;
        }
        .grade-card-head .grade-name {
            font-size: 14px;
            color: var(--color-text-secondary);
        }
        .grade-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 20px;
        }
        .badge {
            display: inline-block;
            background: rgba(241, 182, 120, 0.2);
            color: var(--color-primary-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            border: 1px solid rgba(232, 89, 12, 0.12);
        }
        .grade-price {
            margin-top: auto;
            margin-bottom: 20px;
            display: flex;
            align-items: baseline;
            gap: 8px;
            padding-top: 16px;
            border-top: 1px dashed var(--color-border);
        }
        .price-label {
            font-size: 13px;
            color: var(--color-text-secondary);
        }
        .price-val {
            font-size: 26px;
            font-weight: 700;
            color: var(--color-primary);
            font-family: "Rajdhani", "DIN Alternate", sans-serif;
        }
        .price-val span {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text-secondary);
        }

        /* ===== 帮助 CTA ===== */
        .help-cta {
            background: var(--color-surface-alt);
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }
        .help-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
            background-size: 40px 40px;
        }
        .help-cta .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
            flex-wrap: wrap;
        }
        .help-cta-content {
            flex: 1;
            min-width: 280px;
        }
        .help-cta-content .tagline {
            color: var(--color-accent);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 12px;
            display: block;
        }
        .help-cta-content h2 {
            font-size: 30px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .help-cta-content p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
        }
        .help-cta-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 96px 0;
        }
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .faq-item.active {
            border-color: var(--color-accent);
            box-shadow: 0 0 0 1px rgba(241, 182, 120, 0.3);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 17px;
            font-weight: 600;
            color: var(--color-text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: color 0.2s;
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 2px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 400;
            color: var(--color-primary);
            transition: all 0.3s ease;
            position: relative;
        }
        .faq-icon::before {
            content: "+";
            transition: transform 0.3s ease;
            display: inline-block;
        }
        .faq-item.active .faq-icon {
            background: var(--color-primary);
            border-color: var(--color-primary);
            color: #fff;
        }
        .faq-item.active .faq-icon::before {
            content: "−";
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
            padding: 0 24px 22px;
        }
        .faq-answer p {
            color: var(--color-text-secondary);
            font-size: 15px;
            line-height: 1.8;
            border-top: 1px dashed var(--color-border);
            padding-top: 16px;
        }

        /* ===== 底部 CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            padding: 64px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            top: -50%;
            right: -10%;
            width: 40%;
            height: 200%;
            background: rgba(255, 255, 255, 0.06);
            transform: rotate(15deg);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 16px;
            margin-bottom: 28px;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-surface-alt);
            color: rgba(255, 255, 255, 0.75);
            padding: 72px 0 0;
            font-size: 15px;
        }
        .site-footer .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            padding-bottom: 48px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            transition: color 0.2s;
        }
        .footer-col ul li a:hover {
            color: var(--color-accent);
        }
        .footer-brand .logo {
            margin-bottom: 8px;
        }
        .footer-brand .logo-text .logo-title {
            color: #fff;
        }
        .footer-brand .logo-text .logo-sub {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            margin-top: 16px !important;
            line-height: 1.7;
        }
        .footer-contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
        }
        .footer-contact-item svg {
            flex-shrink: 0;
            color: var(--color-accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }
            .grade-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .main-nav {
                gap: 16px;
            }
            .main-nav a {
                font-size: 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .page-hero h1 {
                font-size: 34px;
            }
            .help-cta .container {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 767px) {
            .container {
                padding: 0 20px;
            }
            .top-bar .container {
                justify-content: center;
                flex-direction: column;
                gap: 2px;
                min-height: 40px;
                padding: 6px 0;
            }
            .top-bar .service-info:last-child {
                display: none;
            }
            .header-main .container {
                min-height: 64px;
            }
            .logo-title {
                font-size: 19px !important;
            }
            .logo-sub {
                font-size: 11px !important;
            }
            .logo-icon {
                width: 36px;
                height: 36px;
                font-size: 16px;
            }
            .main-nav {
                display: none;
            }
            .burger-menu {
                display: flex;
            }
            .section {
                padding: 64px 0;
            }
            .section-head h2 {
                font-size: 26px;
            }
            .page-hero {
                padding: 48px 0;
            }
            .page-hero h1 {
                font-size: 28px;
            }
            .page-hero-desc {
                font-size: 15px;
            }
            .page-hero-stats {
                gap: 20px;
            }
            .hero-stat .num {
                font-size: 24px;
            }
            .grade-filter {
                top: 64px;
                padding: 16px 0;
            }
            .filter-tabs {
                flex-wrap: nowrap;
                overflow-x: auto;
                padding-bottom: 4px;
                -webkit-overflow-scrolling: touch;
            }
            .filter-tab {
                white-space: nowrap;
                padding: 8px 16px;
                font-size: 14px;
            }
            .grade-grid-section {
                padding: 48px 0 64px;
            }
            .grade-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .grade-card-img {
                height: 180px;
            }
            .help-cta {
                padding: 48px 0;
            }
            .help-cta-content h2 {
                font-size: 24px;
            }
            .help-cta-actions {
                width: 100%;
                flex-direction: column;
            }
            .help-cta-actions .btn {
                width: 100%;
            }
            .faq-section {
                padding: 64px 0;
            }
            .faq-question {
                font-size: 15px;
                padding: 16px 18px;
            }
            .faq-answer p {
                font-size: 14px;
            }
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .site-footer {
                padding-top: 48px;
            }
            .site-footer .container {
                padding: 0 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                padding-bottom: 32px;
            }
            .footer-bottom p {
                font-size: 12px;
            }
        }
        @media (max-width: 520px) {
            .page-hero-stats {
                flex-direction: column;
                gap: 12px;
            }
            .hero-stat {
                border-left-width: 3px;
            }
            .price-val {
                font-size: 22px;
            }
            .grade-card-body {
                padding: 18px;
            }
        }