:root {
  --primary: #0E7C86;
  --primary-d: #0A5A62;
  --accent: #F2994A;
  --ink: #1A2B32;
  --muted: #5F6B70;
  --bg: #FFFFFF;
  --bg-alt: #F4F8F8;
  --line: #E2EAEA;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-size: 18px; font-weight: 700; color: var(--primary-d); letter-spacing: .5px; }
.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--ink);
  cursor: pointer;
}
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { font-size: 14px; color: var(--muted); transition: color .2s; }
.nav-links a:hover { color: var(--primary); }
.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 600;
}

/* Hero */
.hero {
  position: relative;
  min-height: 460px;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  color: #fff;
}
.hero-mask {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(10,40,44,.72) 0%, rgba(10,40,44,.35) 60%, rgba(10,40,44,.15) 100%);
}
.hero-inner { position: relative; z-index: 1; max-width: 640px; padding: 60px 0; }
.hero-eyebrow {
  display: inline-block;
  font-size: 13px; letter-spacing: 2px;
  background: rgba(255,255,255,.16);
  padding: 5px 12px; border-radius: 999px; margin: 0 0 14px;
}
.hero h1 { font-size: 40px; line-height: 1.2; margin: 0 0 16px; font-weight: 700; }
.hero-sub { font-size: 17px; margin: 0 0 28px; opacity: .95; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(242,153,74,.32); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn-block { width: 100%; }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.kicker { color: var(--primary); font-size: 13px; font-weight: 600; letter-spacing: 2px; margin: 0 0 10px; }
.section h2 { font-size: 28px; line-height: 1.3; margin: 0 0 18px; font-weight: 700; }
.lead { font-size: 16px; color: var(--muted); max-width: 720px; }
.note { font-size: 13px; color: var(--muted); margin-top: 22px; border-left: 3px solid var(--line); padding-left: 12px; }

/* About stats */
.about-grid { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 34px; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 26px; flex: 1; min-width: 160px; }
.stat-num { display: block; font-size: 24px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 13px; color: var(--muted); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 22px; margin-top: 34px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 14px 30px rgba(14,124,134,.12); }
.card img { width: 100%; height: 180px; object-fit: cover; }
.card-body { padding: 18px 18px 22px; }
.card-body h3 { margin: 0 0 8px; font-size: 18px; }
.card-body p { margin: 0 0 12px; font-size: 14px; color: var(--muted); }
.card-link { color: var(--primary); font-size: 14px; font-weight: 600; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 22px; margin-top: 34px; }
.feature { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.feature-ico { display: inline-block; font-size: 14px; font-weight: 700; color: var(--primary); background: var(--bg-alt); border-radius: 8px; padding: 4px 10px; margin-bottom: 12px; }
.feature h3 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; font-size: 14px; color: var(--muted); }

/* Cases */
.cases { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; margin-top: 34px; }
.case { margin: 0; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.case blockquote { margin: 0 0 14px; font-size: 15px; color: var(--ink); }
.case figcaption { font-size: 13px; color: var(--muted); }

/* Contact */
.contact { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-d) 100%); color: #fff; }
.contact .kicker { color: rgba(255,255,255,.8); }
.contact h2 { color: #fff; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-list { list-style: none; padding: 0; margin: 18px 0 0; }
.contact-list li { padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.18); font-size: 15px; }
.contact-list span { display: inline-block; width: 48px; color: rgba(255,255,255,.7); font-size: 13px; }

.contact-form { background: #fff; border-radius: var(--radius); padding: 26px; color: var(--ink); }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 10px;
  font-size: 14px; font-family: inherit; color: var(--ink); background: #fff;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
.form-hint { margin: 12px 0 0; font-size: 14px; color: var(--primary); font-weight: 600; }

/* Footer */
.site-footer { background: #0C2A2E; color: rgba(255,255,255,.75); padding: 36px 0; }
.foot-brand { font-size: 17px; font-weight: 700; color: #fff; margin: 0 0 8px; }
.foot-meta { font-size: 13px; margin: 4px 0; }

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 62px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .25s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a { padding: 14px 20px; border-bottom: 1px solid var(--line); }
  .nav-cta { margin: 10px 20px; text-align: center; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 15px; }
  .section { padding: 52px 0; }
  .section h2 { font-size: 23px; }
  .contact-grid { grid-template-columns: 1fr; gap: 26px; }
}