:root {
  --navy: #0f2b46;
  --navy-deep: #0a1f34;
  --blue: #1f6fd0;
  --blue-light: #4da3ff;
  --text: #1c2b3a;
  --muted: #5b6b7c;
  --border: #e3e9f0;
  --bg-soft: #f6f9fc;
  --white: #ffffff;
  --radius: 10px;
  --container: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; font-weight: 600; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { width: 32px; height: 32px; flex: none; }
.logo-text { display: flex; flex-direction: column; font-size: 17px; font-weight: 600; letter-spacing: .5px; }
.logo-text em { font-style: normal; font-size: 10px; font-weight: 400; letter-spacing: 1.4px; color: var(--muted); text-transform: uppercase; }
.nav { display: flex; gap: 32px; }
.nav a { font-size: 15px; color: var(--muted); transition: color .18s; }
.nav a:hover { color: var(--blue); }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(900px 420px at 78% -10%, rgba(77,163,255,.22), transparent 62%),
    linear-gradient(160deg, var(--navy-deep) 0%, var(--navy) 58%, #16436f 100%);
  color: var(--white);
  padding: 96px 0 88px;
}
.hero-inner { max-width: 780px; }
.hero-eyebrow { font-size: 12px; letter-spacing: 2.4px; color: var(--blue-light); margin-bottom: 18px; font-weight: 600; }
.hero h1 { font-size: 44px; letter-spacing: -.5px; margin-bottom: 20px; }
.hero-sub { font-size: 17px; color: rgba(255,255,255,.78); max-width: 620px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-points { display: flex; gap: 28px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; border-top: 1px solid rgba(255,255,255,.14); padding-top: 22px; }
.hero-points li { font-size: 14px; color: rgba(255,255,255,.7); position: relative; padding-left: 18px; }
.hero-points li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--blue-light); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 24px; border-radius: 8px; font-size: 15px; font-weight: 500;
  border: 1px solid transparent; cursor: pointer; transition: all .18s;
  font-family: inherit;
}
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: #1a5fb4; }
.btn-ghost { border-color: rgba(255,255,255,.3); color: var(--white); }
.btn-ghost:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.55); }
.btn-block { width: 100%; }

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section-soft { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 620px; margin-bottom: 52px; }
.section-eyebrow { font-size: 12px; letter-spacing: 2.2px; color: var(--blue); font-weight: 600; margin-bottom: 12px; }
.section-head h2, .about-text h2 { font-size: 30px; }
.section-desc { color: var(--muted); font-size: 16px; margin: 0; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(15,43,70,.09); border-color: #cfe0f2; }
.card-icon { width: 42px; height: 42px; color: var(--blue); margin-bottom: 18px; }
.card-icon svg { width: 100%; height: 100%; }
.card h3 { font-size: 17px; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--muted); margin: 0; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 64px; align-items: start; }
.about-text p { color: var(--muted); font-size: 15.5px; }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.stat {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 20px; text-align: center;
}
.stat strong { display: block; font-size: 28px; color: var(--navy); letter-spacing: -.5px; }
.stat span { font-size: 13.5px; color: var(--muted); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; }
.contact-info { display: flex; flex-direction: column; gap: 26px; }
.contact-item { display: flex; flex-direction: column; gap: 4px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }
.contact-item:last-child { border-bottom: none; }
.contact-label { font-size: 12.5px; letter-spacing: 1.2px; color: var(--blue); font-weight: 600; text-transform: uppercase; }
.contact-item a { font-size: 16px; }
.contact-item a:hover { color: var(--blue); }
.contact-item span:not(.contact-label) { font-size: 15.5px; color: var(--muted); }

.contact-form { display: flex; flex-direction: column; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 14px; font-weight: 500; }
.field input, .field textarea {
  font-family: inherit; font-size: 15px; color: var(--text);
  padding: 11px 14px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--white); transition: border-color .18s, box-shadow .18s; resize: vertical;
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(31,111,208,.12);
}
.form-note { font-size: 14px; color: #1a7f4b; margin: 0; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-deep); color: rgba(255,255,255,.62); padding: 36px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-brand { display: flex; flex-direction: column; }
.footer-name { color: var(--white); font-size: 16px; font-weight: 600; }
.footer-en { font-size: 12px; letter-spacing: .6px; }
.footer-copy { margin: 0; font-size: 13.5px; }

/* ---------- 404 ---------- */
.error-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 40px 24px; background: var(--bg-soft);
}
.error-code { font-size: 72px; font-weight: 600; color: var(--navy); letter-spacing: -2px; margin: 0; }
.error-page h1 { font-size: 24px; margin: 8px 0 12px; }
.error-page p { color: var(--muted); max-width: 420px; margin: 0 auto 28px; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 34px; }
}
@media (max-width: 620px) {
  .nav { display: none; }
  .cards { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 68px 0 60px; }
  .hero h1 { font-size: 27px; }
  .section { padding: 60px 0; }
  .hero-points { gap: 14px; }
}