/* 诚盟互动 - 官网样式表 */
:root {
  --color-blue: #1E4E79;        /* 诚蓝 */
  --color-teal: #2D9DA8;        /* 盟青 */
  --color-orange: #EF7D4D;      /* 暖橙 */
  --color-blue-dark: #163c5e;
  --color-teal-dark: #227c85;
  --color-orange-dark: #d9683c;
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-border: #e9ecef;
  --color-text: #212529;
  --color-text-secondary: #495057;
  --color-text-muted: #6c757d;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(30, 78, 121, 0.05);
  --shadow-md: 0 6px 16px rgba(30, 78, 121, 0.08);
  --shadow-lg: 0 14px 30px rgba(30, 78, 121, 0.1);
  --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1180px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--color-blue); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--color-teal); }

h1, h2, h3, h4 { margin: 0 0 .6em; line-height: 1.3; font-weight: 700; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text);
  letter-spacing: -.02em;
}

.logo-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.logo:hover { color: var(--color-text); }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  display: block;
  padding: 8px 14px;
  color: var(--color-text-secondary);
  font-size: .95rem;
  border-radius: var(--radius);
}
.main-nav a:hover, .main-nav a.active { color: var(--color-blue); background: var(--color-surface); }

.nav-cta {
  margin-left: 8px;
  background: var(--color-orange);
  color: #fff !important;
}
.nav-cta:hover { background: var(--color-orange-dark); color: #fff !important; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  border-radius: 2px;
  transition: .25s ease;
}

/* Hero */
.hero {
  position: relative;
  background: var(--color-surface);
  padding: 72px 0 64px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.hero-tag {
  display: inline-block;
  color: var(--color-teal);
  font-weight: 700;
  font-size: .9rem;
  margin-bottom: 14px;
  letter-spacing: .02em;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--color-blue);
  margin-bottom: .5em;
}
.hero .lead {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 56ch;
  margin-bottom: 28px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .98rem;
  border: 0;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--color-orange); color: #fff; box-shadow: 0 4px 12px rgba(239, 125, 77, .25); }
.btn-primary:hover { background: var(--color-orange-dark); color: #fff; box-shadow: 0 6px 16px rgba(239, 125, 77, .35); }
.btn-secondary { background: var(--color-blue); color: #fff; }
.btn-secondary:hover { background: var(--color-blue-dark); color: #fff; }
.btn-outline { background: transparent; color: var(--color-blue); border: 1.5px solid var(--color-blue); }
.btn-outline:hover { background: var(--color-surface); color: var(--color-blue); }

/* Hero visual */
.hero-visual {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, 1fr);
}
.hero-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  transition: transform .25s ease, box-shadow .25s ease;
}
.hero-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.hero-card h3 { font-size: 1.05rem; margin-bottom: .4em; color: var(--color-blue); }
.hero-card p { font-size: .92rem; color: var(--color-text-secondary); margin: 0; }
.icon-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  color: #fff;
  font-weight: 700;
}
.bg-blue { background: var(--color-blue); }
.bg-teal { background: var(--color-teal); }
.bg-orange { background: var(--color-orange); }
.bg-teal-dark { background: var(--color-teal-dark); }

/* Sections */
.section { padding: 64px 0; }
.section-alt { background: var(--color-surface); }
.section-title { text-align: center; margin-bottom: 42px; }
.section-title h2 { font-size: clamp(1.6rem, 4vw, 2.1rem); color: var(--color-blue); }
.section-title p { color: var(--color-text-secondary); max-width: 60ch; margin: 0 auto; }
.section-title.left { text-align: left; }
.section-title.left p { margin: 0; }

/* Grid cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: box-shadow .25s ease, transform .25s ease;
  height: 100%;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card h3 { font-size: 1.1rem; color: var(--color-blue); margin-bottom: .55em; }
.card p { color: var(--color-text-secondary); font-size: .96rem; margin-bottom: 0; }
.card .icon { width: 44px; height: 44px; margin-bottom: 16px; }

/* Feature split */
.feature-split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.feature-list { list-style: none; padding: 0; margin: 0; }
.feature-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 14px;
  color: var(--color-text-secondary);
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-teal);
  box-shadow: 0 0 0 4px rgba(45, 157, 168, .12);
}

/* Process */
.process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.process-step {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}
.process-step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-blue);
  color: #fff;
  font-weight: 700;
  margin-bottom: 14px;
}
.process-step h3 { font-size: 1.05rem; color: var(--color-blue); margin-bottom: .4em; }
.process-step p { font-size: .92rem; color: var(--color-text-secondary); margin: 0; }

/* CTA band */
.cta-band {
  background: var(--color-blue);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
}
.cta-band h2 { color: #fff; font-size: 1.8rem; margin-bottom: .4em; }
.cta-band p { color: rgba(255,255,255,.85); max-width: 56ch; margin: 0 auto 24px; }
.cta-band .btn-primary { background: #fff; color: var(--color-blue); box-shadow: none; }
.cta-band .btn-primary:hover { background: var(--color-surface); color: var(--color-blue-dark); }

/* FAQ */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--color-border); padding: 22px 0; }
.faq-item h3 { font-size: 1.05rem; color: var(--color-blue); margin-bottom: .5em; }
.faq-item p { color: var(--color-text-secondary); margin: 0; }

/* Footer */
.site-footer {
  background: var(--color-blue-dark);
  color: rgba(255,255,255,.85);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.5fr;
  gap: 36px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { color: rgba(255,255,255,.7); font-size: .95rem; margin-bottom: 1em; }
.footer-links h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-links ul { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255,255,255,.75); }
.footer-links a:hover { color: #fff; }
.footer-contact p { margin: 0 0 10px; color: rgba(255,255,255,.75); font-size: .95rem; }
.footer-contact a { color: rgba(255,255,255,.85); }
.footer-contact a:hover { color: #fff; }

.beian-bar {
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: rgba(255,255,255,.65);
  font-size: .88rem;
}
.beian-bar a { color: rgba(255,255,255,.75); }
.beian-bar a:hover { color: #fff; }
.beian-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,.75);
}
.beian-link img { width: 20px; height: 22px; display: inline-block; }

.copyright { text-align: center; padding: 18px 0; font-size: .85rem; color: rgba(255,255,255,.55); }

/* Page header */
.page-header {
  background: var(--color-blue);
  color: #fff;
  padding: 52px 0;
  text-align: center;
}
.page-header h1 { color: #fff; font-size: 2rem; margin-bottom: .3em; }
.page-header p { color: rgba(255,255,255,.8); margin: 0 auto; max-width: 64ch; }

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: .88rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-blue); }

/* Service detail */
.service-detail { display: grid; grid-template-columns: 1.2fr .8fr; gap: 36px; align-items: start; }
.service-list { display: grid; gap: 18px; }
.service-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.service-row .num {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-blue);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}
.service-row h3 { font-size: 1.1rem; color: var(--color-blue); margin-bottom: .35em; }
.service-row p { margin: 0; color: var(--color-text-secondary); font-size: .95rem; }

/* Cases */
.case-card { position: relative; overflow: hidden; }
.case-card .thumb {
  height: 170px;
  background: var(--color-surface);
  border-radius: var(--radius) var(--radius) 0 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  font-size: .9rem;
  border-bottom: 1px solid var(--color-border);
}
.case-card .body { padding: 22px; }
.case-card .tag {
  display: inline-block;
  font-size: .78rem;
  color: var(--color-teal);
  background: rgba(45,157,168,.08);
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
  font-weight: 600;
}
.case-card h3 { font-size: 1.05rem; color: var(--color-blue); margin-bottom: .4em; }
.case-card p { font-size: .92rem; color: var(--color-text-secondary); margin: 0; }

/* About */
.about-intro { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; align-items: start; }
.info-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.info-table th, .info-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}
.info-table th { width: 140px; color: var(--color-text-secondary); font-weight: 600; background: var(--color-surface); }
.info-table td { color: var(--color-text); }

.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.value-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 22px; }
.value-card h3 { color: var(--color-blue); font-size: 1.05rem; margin-bottom: .4em; }
.value-card p { margin: 0; color: var(--color-text-secondary); font-size: .93rem; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 36px; }
.contact-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 28px; }
.contact-card h3 { color: var(--color-blue); margin-bottom: 1em; }
.contact-item { display: flex; gap: 14px; margin-bottom: 18px; align-items: flex-start; }
.contact-item .icon { width: 40px; height: 40px; border-radius: 50%; background: var(--color-surface); color: var(--color-blue); display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
.contact-item .label { display: block; font-size: .85rem; color: var(--color-text-muted); margin-bottom: 2px; }
.contact-item .value { font-weight: 600; color: var(--color-text); }
/* Form */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 6px; color: var(--color-text-secondary); }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: .95rem;
  color: var(--color-text);
  background: #fff;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(45, 157, 168, .12);
}
.form-note { font-size: .85rem; color: var(--color-text-muted); margin-top: 12px; }

/* Article / legal */
.legal-content { max-width: 820px; margin: 0 auto; }
.legal-content h2 { color: var(--color-blue); font-size: 1.3rem; margin-top: 1.6em; }
.legal-content h3 { color: var(--color-blue); font-size: 1.1rem; margin-top: 1.4em; }
.legal-content p, .legal-content li { color: var(--color-text-secondary); }

/* 404 */
.not-found { text-align: center; padding: 80px 0; }
.not-found h1 { font-size: 5rem; color: var(--color-blue); margin-bottom: .1em; }

/* Utilities */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.order-2 { order: 2; }

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hero-grid, .feature-split, .about-intro, .contact-grid, .service-detail { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .cta-band { padding: 36px 24px; }
  .cta-band h2 { font-size: 1.45rem; }
  .page-header { padding: 40px 0; }
  .hero { padding: 50px 0 42px; }

  .main-nav {
    position: fixed;
    top: 68px;
    left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 10px 20px 20px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform .3s ease, opacity .25s ease;
  }
  .main-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .main-nav a { padding: 12px 0; border-bottom: 1px solid var(--color-border); border-radius: 0; }
  .nav-cta { margin: 12px 0 0; text-align: center; border-radius: var(--radius); border: 0; }
  .menu-toggle { display: block; }

  .beian-bar { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero-card { padding: 18px; }
  .card { padding: 20px; }
  .btn { width: 100%; }
  .hero-actions .btn { width: 100%; }
}