/* ============================================================
   m.synsiano.com — mobile-first stylesheet (no dependencies)
   Brand palette: deep navy #0e2a5c / #1a3c8f, accent orange #f39200
   ============================================================ */
:root {
  --navy: #0e2a5c;
  --navy-2: #1a3c8f;
  --blue: #2563eb;
  --accent: #f39200;
  --ink: #1c2330;
  --ink-soft: #5b6572;
  --bg: #f5f7fa;
  --card: #ffffff;
  --line: #e3e8ef;
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--navy-2); text-decoration: none; }

/* English companion text */
.en {
  display: block;
  font-size: 0.82em;
  color: var(--ink-soft);
  font-weight: 400;
  line-height: 1.5;
}

/* ============ Top bar ============ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px;
  background: rgba(14, 42, 92, 0.96);
  backdrop-filter: blur(8px);
  padding-top: calc(10px + env(safe-area-inset-top));
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.brand-zh {
  color: #fff; font-size: 20px; font-weight: 800; letter-spacing: 2px;
}
.brand-en {
  color: #8fb3f5; font-size: 13px; font-weight: 600; letter-spacing: 1px;
}
.topnav { display: flex; gap: 4px; }
.topnav a {
  color: #cdd9f0; font-size: 14px; padding: 6px 9px; border-radius: 8px;
}
.topnav a.nav-cta {
  background: var(--accent); color: #fff; font-weight: 700;
}

/* ============ Hero ============ */
.hero {
  background: linear-gradient(160deg, #0e2a5c 0%, #1a3c8f 62%, #27509f 100%);
  color: #fff;
  padding: 44px 20px 0;
}
.hero-kicker {
  font-size: 11px; letter-spacing: 1px; color: #9db8e8;
  text-transform: uppercase; margin-bottom: 14px;
}
.hero h1 {
  font-size: 30px; line-height: 1.25; font-weight: 800; letter-spacing: 1px;
}
.hero-sub {
  display: block; font-size: 14px; font-weight: 500;
  color: #9db8e8; letter-spacing: 0.5px; margin-top: 6px;
}
.hero-lead {
  margin-top: 16px; font-size: 17px; color: #e7eefc; font-weight: 600;
}
.hero-lead .en { color: #9db8e8; font-weight: 400; }
.hero-cta { display: flex; gap: 12px; margin: 22px 0 30px; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px;
  font-size: 15px; font-weight: 700; text-align: center; flex: 1;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { border: 1.5px solid #5f83c9; color: #dbe6fb; }

.trustbar {
  list-style: none; display: flex;
  background: #fff; border-radius: var(--radius) var(--radius) 0 0;
  margin: 0 -20px; padding: 16px 8px 14px;
}
.trustbar li {
  flex: 1; text-align: center; padding: 0 6px;
  border-left: 1px solid var(--line);
}
.trustbar li:first-child { border-left: none; }
.trustbar strong {
  display: block; color: var(--navy-2); font-size: 15px; font-weight: 800;
}
.trustbar span {
  display: block; font-size: 10.5px; color: var(--ink-soft); margin-top: 3px; line-height: 1.45;
}
.trustbar .en { display: inline; font-size: 9.5px; }

/* ============ Sections ============ */
.section { padding: 40px 20px 44px; }
.section-alt { background: #eef2f8; }
.sec-title {
  font-size: 22px; font-weight: 800; color: var(--navy);
  letter-spacing: 1px; margin-bottom: 8px;
}
.sec-title-en {
  display: block; font-size: 12px; font-weight: 600; color: #8794a8;
  letter-spacing: 1.5px; text-transform: uppercase; margin-top: 2px;
}
.sec-title-light { color: #fff; }
.sec-title-light .sec-title-en { color: #7f95c4; }
.sec-lead { font-size: 14.5px; color: var(--ink-soft); margin-bottom: 24px; }

/* ============ Product cards ============ */
.pcard {
  position: relative;
  background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 20px 18px 18px;
  margin-bottom: 18px;
  box-shadow: 0 2px 10px rgba(14, 42, 92, 0.06);
}
.pcard-flag { border: 2px solid var(--navy-2); }
.pcard-flagtag {
  position: absolute; top: -11px; left: 16px;
  background: var(--accent); color: #fff;
  font-size: 11px; font-weight: 800; letter-spacing: 1px;
  padding: 3px 12px; border-radius: 999px;
}
.pcard-head h3 {
  font-size: 24px; font-weight: 800; color: var(--navy);
  letter-spacing: 0.5px;
}
.pcard-title {
  font-size: 14.5px; font-weight: 700; color: var(--ink); margin-top: 2px;
}
.pcard-title .en { font-weight: 400; }
.spec { list-style: none; margin-top: 14px; }
.spec li {
  padding: 9px 0; border-top: 1px dashed var(--line);
  font-size: 13.5px; color: var(--ink);
}
.spec li b {
  display: block; color: var(--navy-2); font-size: 12px;
  letter-spacing: 1px; margin-bottom: 2px;
}
.pcard-fig { margin-top: 14px; }
.pcard-fig img {
  border-radius: 10px; border: 1px solid var(--line); width: 100%;
}
.pcard-fig figcaption {
  font-size: 11px; color: var(--ink-soft); margin-top: 6px; text-align: center;
}
.pnote {
  background: #fff8ec; border: 1px solid #f5dfb8; border-radius: var(--radius);
  padding: 14px 16px; font-size: 13.5px; margin-top: 22px;
}
.pnote p + p { margin-top: 10px; }

/* ============ Turnkey ============ */
.turnkey { list-style: none; }
.turnkey li {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 14px 16px; margin-bottom: 12px;
}
.tk-num {
  flex: 0 0 34px; height: 34px; border-radius: 50%;
  background: var(--navy-2); color: #fff;
  font-weight: 800; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.turnkey b { font-size: 15px; color: var(--navy); }
.turnkey p { font-size: 13px; color: var(--ink-soft); margin-top: 2px; }

/* ============ Global map ============ */
.mapfig { margin-bottom: 20px; }
.mapfig img {
  border-radius: var(--radius); border: 1px solid var(--line);
  background: #fff; padding: 6px;
}
.mapfig figcaption {
  font-size: 12px; color: var(--ink-soft); margin-top: 8px; text-align: center;
}
.facts { list-style: none; }
.facts li {
  background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 14px 16px; margin-bottom: 12px; font-size: 13.5px;
}
.facts li b {
  display: block; color: var(--navy); font-size: 15px; margin-bottom: 4px;
}
.facts li b::before { content: "▎"; color: var(--accent); }

/* ============ About ============ */
.abouttxt p { font-size: 14px; margin-bottom: 14px; }
.timeline { margin-top: 22px; border-left: 2px solid var(--line); padding-left: 16px; }
.tl-item { position: relative; margin-bottom: 18px; }
.tl-item::before {
  content: ""; position: absolute; left: -22px; top: 6px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--line);
}
.tl-date {
  font-size: 11.5px; font-weight: 800; color: var(--navy-2);
  letter-spacing: 1px;
}
.tl-item b { display: block; font-size: 14.5px; margin-top: 2px; }
.tl-item p { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }

/* ============ WeChat placeholder ============ */
.wechat {
  margin-top: 26px;
  display: flex; gap: 16px; align-items: center;
  background: linear-gradient(135deg, #0e2a5c, #1a3c8f);
  border-radius: var(--radius); padding: 18px 16px; color: #fff;
}
.wechat-txt { flex: 1; }
.wechat-txt b { font-size: 16px; }
.wechat-txt p { font-size: 12.5px; color: #c3d4f2; margin-top: 6px; }
.wechat-hint { font-size: 10.5px; color: #7f95c4; }
.wechat-qr {
  flex: 0 0 96px;
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}
.wechat-qr img { display: block; width: 100%; height: auto; }

/* ============ Contact ============ */
.contact {
  background: linear-gradient(160deg, #0e2a5c 0%, #1a3c8f 100%);
  padding-bottom: 34px;
}
.contact-cards { display: grid; gap: 12px; margin-top: 4px; }
.ccard {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius); padding: 14px 16px;
  display: block;
}
.ccard b { color: #fff; font-size: 14.5px; display: block; }
.ccard span { color: #9db8e8; font-size: 13.5px; display: block; margin-top: 3px; }
.addr {
  margin-top: 22px; color: #c3d4f2; font-size: 13px; text-align: center;
}
.addr .en { color: #7f95c4; }

/* ============ Footer ============ */
.footer {
  background: #0a1f44; color: #7f95c4;
  padding: 18px 20px calc(18px + env(safe-area-inset-bottom));
  font-size: 11.5px; text-align: center; line-height: 1.8;
}
.footer a { color: #9db8e8; }

/* ============ Small desktop adaptation ============ */
@media (min-width: 640px) {
  body { font-size: 16.5px; }
  .section, .hero { padding-left: calc(50% - 300px); padding-right: calc(50% - 300px); }
  .hero { padding-top: 64px; }
  .trustbar { margin: 0 calc(50% - 300px) 0; border-radius: var(--radius); margin-bottom: -44px; position: relative; z-index: 2; box-shadow: 0 4px 18px rgba(14,42,92,.12); }
  .hero { padding-bottom: 60px; }
  .contact-cards { grid-template-columns: repeat(3, 1fr); }
  .hero h1 { font-size: 36px; }
}