/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: #1f2937; background: #ffffff; line-height: 1.7; font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
h1,h2,h3,h4,h5,h6 { line-height: 1.3; font-weight: 700; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.en-font, .number { font-family: 'Montserrat', 'Noto Sans SC', sans-serif; }

/* ===== Brand Colors ===== */
:root {
  --primary: #00A0E9;
  --primary-dark: #0080c0;
  --dark: #1f2937;
  --light-bg: #f0f9ff;
  --white: #ffffff;
  --gray: #6b7280;
  --border: #e5e7eb;
}

/* ===== Fixed Navigation ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.97); backdrop-filter: blur(8px);
  box-shadow: 0 1px 8px rgba(0,0,0,0.07); height: 72px;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo img { height: 42px; width: auto; }
.nav-logo span { font-size: 1.2rem; font-weight: 700; color: var(--primary); white-space: nowrap; }
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  padding: 8px 14px; border-radius: 6px; font-size: 0.95rem; font-weight: 500;
  color: var(--dark); transition: all .2s;
}
.nav-links a:hover, .nav-links a.active { background: var(--primary); color: #fff; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2.5px; background: var(--dark); border-radius: 2px; transition: .3s; }

/* ===== Hero ===== */
.hero {
  margin-top: 72px; background: linear-gradient(135deg, #00A0E9 0%, #0066a0 100%);
  color: #fff; padding: 100px 0 80px; text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px;
  background: rgba(255,255,255,0.05); border-radius: 50%;
}
.hero h1 { font-size: 2.8rem; margin-bottom: 16px; position: relative; }
.hero .sub { font-size: 1.3rem; opacity: .92; margin-bottom: 10px; position: relative; }
.hero .tagline { font-size: 1.05rem; opacity: .8; position: relative; letter-spacing: 2px; }

/* ===== Section ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--light-bg); }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 2rem; color: var(--dark); margin-bottom: 10px; }
.section-title p { color: var(--gray); font-size: 1.05rem; }
.section-title h2::after {
  content: ''; display: block; width: 50px; height: 3px;
  background: var(--primary); margin: 12px auto 0; border-radius: 2px;
}

/* ===== Cards ===== */
.card-grid { display: grid; gap: 28px; }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border-radius: 12px; padding: 32px 24px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.06); transition: transform .25s, box-shadow .25s;
  border: 1px solid var(--border);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,160,233,0.12); }
.card-icon { font-size: 2.4rem; margin-bottom: 16px; }
.card h3 { font-size: 1.15rem; margin-bottom: 10px; color: var(--dark); }
.card p { color: var(--gray); font-size: 0.95rem; line-height: 1.7; }

/* ===== Buttons ===== */
.btn {
  display: inline-block; padding: 12px 32px; border-radius: 8px; font-size: 1rem;
  font-weight: 600; cursor: pointer; transition: all .25s; border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: #f0f9ff; }

/* ===== Advantages ===== */
.advantage-item {
  display: flex; gap: 18px; align-items: flex-start; padding: 24px;
  background: #fff; border-radius: 12px; border: 1px solid var(--border);
  transition: box-shadow .25s;
}
.advantage-item:hover { box-shadow: 0 4px 20px rgba(0,160,233,0.1); }
.advantage-num {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff; display: flex; align-items: center;
  justify-content: center; font-weight: 700; font-size: 1.1rem;
}
.advantage-item h4 { font-size: 1.05rem; margin-bottom: 6px; }
.advantage-item p { color: var(--gray); font-size: 0.93rem; }

/* ===== Process ===== */
.process-steps { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.process-step {
  flex: 1; min-width: 180px; max-width: 220px; text-align: center; position: relative; padding: 20px 12px;
}
.process-step .step-num {
  width: 52px; height: 52px; border-radius: 50%; background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
  font-weight: 700; margin: 0 auto 14px;
}
.process-step h4 { font-size: 1rem; margin-bottom: 6px; }
.process-step p { font-size: 0.88rem; color: var(--gray); }
.process-step::after {
  content: '→'; position: absolute; right: -18px; top: 36px;
  font-size: 1.4rem; color: var(--primary); font-weight: 700;
}
.process-step:last-child::after { display: none; }

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, #00A0E9 0%, #0066a0 100%);
  color: #fff; text-align: center; padding: 60px 0;
}
.cta-section h2 { font-size: 2rem; margin-bottom: 12px; }
.cta-section p { font-size: 1.1rem; opacity: .9; margin-bottom: 28px; }

/* ===== Stats / Numbers ===== */
.stats-row { display: flex; justify-content: center; gap: 60px; flex-wrap: wrap; margin: 40px 0; }
.stat-item { text-align: center; }
.stat-item .stat-num { font-size: 2.8rem; font-weight: 800; color: var(--primary); }
.stat-item .stat-label { font-size: 0.95rem; color: var(--gray); margin-top: 4px; }

/* ===== Industry Grid ===== */
.industry-card {
  background: #fff; border-radius: 12px; padding: 28px 22px; text-align: center;
  border: 1px solid var(--border); transition: all .25s;
}
.industry-card:hover { border-color: var(--primary); box-shadow: 0 4px 20px rgba(0,160,233,0.12); }
.industry-card .icon { font-size: 2.6rem; margin-bottom: 14px; }
.industry-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.industry-card p { color: var(--gray); font-size: 0.9rem; }

/* ===== Service Detail ===== */
.service-block {
  display: flex; gap: 40px; align-items: flex-start; padding: 40px 0;
  border-bottom: 1px solid var(--border);
}
.service-block:last-child { border-bottom: none; }
.service-block .service-num {
  flex-shrink: 0; width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #0080c0); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; font-weight: 800;
}
.service-block h3 { font-size: 1.2rem; margin-bottom: 8px; }
.service-block p { color: var(--gray); line-height: 1.8; }

/* ===== SLA Highlight ===== */
.sla-box {
  background: linear-gradient(135deg, var(--primary), #0066a0);
  color: #fff; border-radius: 16px; padding: 40px; text-align: center; margin: 40px 0;
}
.sla-box h3 { font-size: 1.5rem; margin-bottom: 12px; }
.sla-box .sla-items { display: flex; justify-content: center; gap: 40px; margin-top: 20px; flex-wrap: wrap; }
.sla-box .sla-item { text-align: center; }
.sla-box .sla-item .val { font-size: 2rem; font-weight: 800; }
.sla-box .sla-item .label { font-size: 0.9rem; opacity: .85; }

/* ===== Cooperation Models ===== */
.model-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 30px; }
.model-card {
  background: var(--light-bg); border-radius: 12px; padding: 24px 18px; text-align: center;
  border: 2px solid transparent; transition: .25s;
}
.model-card:hover { border-color: var(--primary); }
.model-card h4 { color: var(--primary); margin-bottom: 8px; font-size: 1.05rem; }
.model-card p { font-size: 0.9rem; color: var(--gray); }

/* ===== Cases ===== */
.filter-bar { display: flex; gap: 10px; justify-content: center; margin-bottom: 36px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 20px; border-radius: 20px; border: 2px solid var(--border);
  background: #fff; cursor: pointer; font-size: 0.93rem; transition: .2s;
}
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.case-card {
  background: #fff; border-radius: 12px; overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06); border: 1px solid var(--border); transition: .25s;
}
.case-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,160,233,0.12); }
.case-card .case-img {
  height: 180px; background: linear-gradient(135deg, var(--light-bg), #dbeafe);
  display: flex; align-items: center; justify-content: center; font-size: 3rem;
}
.case-card .case-body { padding: 20px; }
.case-card .case-tag {
  display: inline-block; padding: 3px 10px; border-radius: 10px;
  background: var(--light-bg); color: var(--primary); font-size: 0.8rem; margin-bottom: 8px;
}
.case-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.case-card p { font-size: 0.9rem; color: var(--gray); }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info-item { display: flex; gap: 14px; margin-bottom: 24px; align-items: flex-start; }
.contact-info-item .ci-icon {
  width: 44px; height: 44px; border-radius: 10px; background: var(--light-bg);
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem; flex-shrink: 0;
}
.contact-info-item h4 { font-size: 0.95rem; color: var(--gray); margin-bottom: 2px; }
.contact-info-item p { font-size: 1.05rem; font-weight: 600; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.contact-form input, .contact-form textarea {
  padding: 14px 18px; border: 1px solid var(--border); border-radius: 10px;
  font-size: 1rem; font-family: inherit; transition: border-color .2s;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--primary); }
.contact-form textarea { resize: vertical; min-height: 120px; }
.map-placeholder {
  margin-top: 40px; height: 300px; background: var(--light-bg); border-radius: 12px;
  display: flex; align-items: center; justify-content: center; color: var(--gray);
  border: 2px dashed var(--border); font-size: 1.1rem;
}

/* ===== Footer ===== */
.footer {
  background: var(--dark); color: rgba(255,255,255,0.75); padding: 50px 0 24px; font-size: 0.93rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 36px; }
.footer h4 { color: #fff; font-size: 1.05rem; margin-bottom: 16px; }
.footer a { transition: color .2s; }
.footer a:hover { color: var(--primary); }
.footer ul li { margin-bottom: 8px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px;
  text-align: center; font-size: 0.88rem; opacity: .7;
}

/* ===== Page Banner (inner pages) ===== */
.page-banner {
  margin-top: 72px; background: linear-gradient(135deg, #00A0E9 0%, #0066a0 100%);
  color: #fff; padding: 60px 0; text-align: center;
}
.page-banner h1 { font-size: 2.2rem; margin-bottom: 8px; }
.page-banner p { font-size: 1.1rem; opacity: .85; }

/* ===== Responsive ===== */
@media (max-width: 1199px) {
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .model-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .nav-links {
    display: none; flex-direction: column; position: absolute;
    top: 72px; left: 0; right: 0; background: #fff; padding: 16px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1); gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero h1 { font-size: 1.8rem; }
  .hero .sub { font-size: 1.05rem; }
  .card-grid-3, .card-grid-2, .card-grid-4 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .model-grid { grid-template-columns: 1fr; }
  .process-steps { flex-direction: column; align-items: center; }
  .process-step::after { display: none; }
  .stats-row { gap: 30px; }
  .section { padding: 50px 0; }
  .section-title h2 { font-size: 1.5rem; }
  .service-block { flex-direction: column; gap: 16px; }
  .sla-box .sla-items { gap: 20px; }
}