/* Mobile-first · 文化 · 活泼 · 明朗 */
:root {
  --coral: #ff6b4a;
  --coral-dark: #e85a3a;
  --amber: #ffb347;
  --sun: #ffd166;
  --ink: #1a2b3c;
  --ink-soft: #4a5f73;
  --blue: #2d5a87;
  --bg: #fffbf7;
  --bg-alt: #fff5eb;
  --white: #ffffff;
  --radius: 16px;
  --shadow: 0 12px 40px rgba(45, 90, 135, 0.08);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  color: var(--coral);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 251, 247, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 107, 74, 0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
}

.brand img {
  width: 40px;
  height: 40px;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: var(--bg-alt);
  border-radius: 12px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 0 auto;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: var(--white);
  border-bottom: 1px solid rgba(45, 90, 135, 0.1);
  box-shadow: var(--shadow);
  padding: 1rem;
}

.site-nav.is-open {
  display: block;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: block;
  padding: 0.75rem 0.5rem;
  color: var(--ink);
  font-size: 1.05rem;
}

.site-nav a:hover {
  color: var(--coral);
}

/* Hero */
.hero {
  padding: 2.5rem 0 3rem;
  background: linear-gradient(165deg, var(--bg-alt) 0%, var(--bg) 45%, #e8f4fc 100%);
  overflow: hidden;
}

.hero-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  background: var(--white);
  border-radius: 999px;
  font-size: 0.875rem;
  color: var(--blue);
  box-shadow: 0 4px 16px rgba(255, 107, 74, 0.12);
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 5vw, 2.65rem);
  line-height: 1.25;
  font-weight: 700;
  color: var(--ink);
}

.hero h1 em {
  font-style: normal;
  color: var(--coral);
}

.hero-lead {
  margin: 0 0 1.75rem;
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 36em;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.65rem 1.5rem;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--coral), var(--amber));
  color: var(--white);
  box-shadow: 0 8px 24px rgba(255, 107, 74, 0.35);
}

.btn-primary:hover {
  color: var(--white);
  box-shadow: 0 10px 28px rgba(255, 107, 74, 0.45);
}

.btn-outline {
  background: var(--white);
  color: var(--blue);
  border-color: rgba(45, 90, 135, 0.25);
}

.btn-outline:hover {
  border-color: var(--coral);
  color: var(--coral);
}

.hero-visual {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Sections */
.section {
  padding: 3.5rem 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--coral);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.section-head h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--ink);
}

.section-head p {
  margin: 0 auto;
  max-width: 32em;
  color: var(--ink-soft);
  font-size: 1rem;
}

/* About */
.about-card {
  background: var(--white);
  border-radius: calc(var(--radius) + 4px);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 107, 74, 0.08);
}

.about-card p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.about-card p:last-child {
  margin-bottom: 0;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed rgba(45, 90, 135, 0.15);
}

.stat {
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  color: var(--coral);
  margin-bottom: 0.25rem;
}

.stat span {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* Services */
.services-grid {
  display: grid;
  gap: 1.25rem;
}

.service-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid transparent;
  transition: border-color 0.2s, transform 0.2s;
}

.service-card:hover {
  border-color: rgba(255, 107, 74, 0.25);
  transform: translateY(-2px);
}

.service-card img {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
}

.service-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  color: var(--ink);
}

.service-card .subtitle {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  color: var(--coral);
  font-weight: 600;
}

.service-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

/* Advantages */
.advantages {
  display: grid;
  gap: 1.5rem;
}

.advantage-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.advantage-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--sun), var(--amber));
  color: var(--ink);
  font-weight: 700;
  font-size: 1.1rem;
}

.advantage-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.advantage-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Contact strip */
.contact-strip {
  text-align: center;
  padding: 2rem 1.5rem;
  background: linear-gradient(135deg, var(--blue), #3d7ab8);
  color: var(--white);
  border-radius: var(--radius);
}

.contact-strip p {
  margin: 0 0 1rem;
  opacity: 0.95;
}

.contact-strip .btn-primary {
  background: var(--white);
  color: var(--blue);
  box-shadow: none;
}

.contact-strip .btn-primary:hover {
  color: var(--coral);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0 2rem;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}

.footer-top {
  text-align: center;
  margin-bottom: 2rem;
}

.footer-top .brand-name {
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.footer-meta {
  line-height: 1.8;
}

.footer-meta a {
  color: rgba(255, 255, 255, 0.85);
}

.footer-meta a:hover {
  color: var(--amber);
}

.footer-beian {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-beian a {
  display: inline-block;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.footer-beian a:hover {
  color: var(--sun);
}

.footer-copy {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.8rem;
  opacity: 0.55;
}

/* Tablet+ */
@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-card {
    padding: 2.5rem 2rem;
  }
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-header {
    position: relative;
  }

  .site-nav {
    display: block !important;
    position: static;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .site-nav ul {
    display: flex;
    gap: 0.25rem;
  }

  .site-nav a {
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
  }

  .hero-grid {
    flex-direction: row;
    align-items: center;
  }

  .hero-content {
    flex: 1;
  }

  .hero-visual-wrap {
    flex: 1;
    max-width: 480px;
  }

  .advantages {
    grid-template-columns: repeat(3, 1fr);
  }

  .advantage-item {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .section {
    padding: 4.5rem 0;
  }

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