/* ============================================================
   Shanghai PUV — puvshanghai.com
   Global stylesheet
   ============================================================ */

:root {
  --navy: #0a2e4f;
  --navy-2: #0e3d63;
  --blue: #1178be;
  --blue-dark: #0d5fa0;
  --cyan: #2ab8da;
  --ink: #1c3a4e;
  --muted: #5b7286;
  --line: #dce7ef;
  --bg-soft: #f3f8fb;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(10, 46, 79, 0.10);
  --shadow-sm: 0 4px 14px rgba(10, 46, 79, 0.08);
  --maxw: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }

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

/* ---------- Top bar ---------- */
.topbar {
  background: var(--navy);
  color: #bcd3e6;
  font-size: 13px;
}
.topbar .container {
  display: flex; justify-content: space-between; align-items: center;
  min-height: 36px; gap: 16px;
}
.topbar a { color: #dceafa; }
.topbar a:hover { color: #ffffff; }
.topbar .tb-left { display: flex; gap: 18px; flex-wrap: wrap; }
.topbar .tb-right { white-space: nowrap; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 44px; width: auto; }
.brand .brand-text { line-height: 1.15; }
.brand .brand-text strong {
  display: block; font-size: 15px; letter-spacing: 0.04em; color: var(--navy);
}
.brand .brand-text span {
  display: block; font-size: 11.5px; color: var(--muted); letter-spacing: 0.02em;
}

.main-nav { display: flex; align-items: center; gap: 26px; }
.main-nav a {
  color: var(--ink); font-weight: 600; font-size: 15px;
  padding: 6px 2px; border-bottom: 2px solid transparent;
}
.main-nav a:hover { color: var(--blue); }
.main-nav a.active { color: var(--blue); border-bottom-color: var(--cyan); }

.btn {
  display: inline-block; padding: 12px 24px; border-radius: 999px;
  font-weight: 700; font-size: 15px; letter-spacing: 0.01em;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  cursor: pointer; border: 2px solid transparent; text-align: center;
}
.btn-primary { background: var(--blue); color: #fff !important; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-ghost { border-color: rgba(255,255,255,0.55); color: #fff !important; }
.btn-ghost:hover { background: rgba(255,255,255,0.12); }
.btn-outline { border-color: var(--blue); color: var(--blue) !important; }
.btn-outline:hover { background: var(--blue); color: #fff !important; }
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* Language toggle — segmented EN | 中文 control */
.lang-toggle {
  display: flex; align-items: stretch; overflow: hidden;
  border: 2px solid var(--blue); border-radius: 999px;
  font-weight: 800; font-size: 13.5px; line-height: 1;
  box-shadow: 0 2px 8px rgba(17, 120, 190, 0.18);
}
.lang-toggle a {
  display: flex; align-items: center; padding: 8px 15px;
  color: var(--blue); border-bottom: 0 !important;
}
.lang-toggle a.on { background: var(--blue); color: #fff; }
.lang-toggle a:not(.on):hover { background: rgba(17, 120, 190, 0.10); color: var(--blue-dark); }

/* Chinese typography */
html[lang^="zh"] body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
html[lang^="zh"] h1, html[lang^="zh"] h2, html[lang^="zh"] h3 { letter-spacing: 0; }

.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2.6px; background: var(--navy);
  margin: 5px 0; border-radius: 2px; transition: 0.25s;
}

/* ---------- Hero (home) ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background:
    radial-gradient(900px 500px at 85% 10%, rgba(42, 184, 218, 0.25), transparent 60%),
    linear-gradient(135deg, #0a2e4f 0%, #0e3d63 55%, #10528a 100%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cpath d='M0 60 Q30 45 60 60 T120 60' fill='none' stroke='rgba(255,255,255,0.05)' stroke-width='1.5'/%3E%3C/svg%3E");
}
.hero .container {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px;
  align-items: center; padding-top: 84px; padding-bottom: 84px;
}
.hero .eyebrow { color: #7fd4ea; }
.hero h1 {
  font-size: clamp(34px, 4.6vw, 54px); line-height: 1.12;
  letter-spacing: -0.02em; margin: 14px 0 20px;
}
.hero p.lead {
  font-size: 18px; color: #d7e6f3; max-width: 560px; margin-bottom: 30px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-media { position: relative; }
.hero-media .photo-card {
  background: #fff; border-radius: var(--radius); padding: 10px;
  box-shadow: 0 24px 60px rgba(2, 16, 29, 0.45);
  transform: rotate(1.5deg);
}
.hero-media .photo-card img { border-radius: 10px; }
.hero-media .badge {
  position: absolute; left: -14px; bottom: -16px;
  background: var(--cyan); color: #062a35; font-weight: 800;
  padding: 10px 18px; border-radius: 10px; font-size: 14px;
  box-shadow: var(--shadow);
}

/* stats strip */
.stats { background: var(--navy); color: #fff; }
.stats .container {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px; padding-top: 26px; padding-bottom: 26px;
}
.stat { text-align: center; padding: 6px 8px; }
.stat .num { font-size: 30px; font-weight: 800; color: #6fd3ec; letter-spacing: -0.01em; }
.stat .lbl { font-size: 13.5px; color: #b9cfe2; margin-top: 2px; }

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section.soft { background: var(--bg-soft); }
.section.dark { background: var(--navy); color: #fff; }

.eyebrow {
  text-transform: uppercase; letter-spacing: 0.14em; font-size: 12.5px;
  font-weight: 800; color: var(--cyan);
}
.section h2 {
  font-size: clamp(26px, 3.2vw, 38px); line-height: 1.18;
  letter-spacing: -0.02em; color: var(--navy); margin: 10px 0 14px;
}
.section.dark h2 { color: #fff; }
.section .lead {
  color: var(--muted); font-size: 17.5px; max-width: 720px;
}
.section.dark .lead { color: #c6d8e8; }
.section-head { margin-bottom: 44px; }
.section-head.center { text-align: center; }
.section-head.center .lead { margin: 0 auto; }

/* ---------- Cards ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card .card-media { aspect-ratio: 16/10; overflow: hidden; }
.card .card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.card:hover .card-media img { transform: scale(1.05); }
.card .card-body { padding: 22px 24px 26px; flex: 1; display: flex; flex-direction: column; }
.card h3 { font-size: 19px; color: var(--navy); margin-bottom: 8px; letter-spacing: -0.01em; }
.card p { color: var(--muted); font-size: 15px; flex: 1; }
.card .card-link { margin-top: 14px; font-weight: 700; font-size: 14.5px; }
.card .card-link::after { content: " →"; }

/* product feature split */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split .split-media img {
  border-radius: var(--radius); box-shadow: var(--shadow); width: 100%;
}
.split h2 { font-size: clamp(24px, 3vw, 34px); }
.split ul.checks { margin: 18px 0 26px; list-style: none; }
.split ul.checks li {
  padding-left: 30px; position: relative; margin-bottom: 11px; color: var(--ink);
}
.split ul.checks li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--cyan); font-weight: 800;
}

/* icon feature cards */
.feature {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow-sm);
}
.section.dark .feature {
  background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.14);
  color: #e6f0f8;
}
.feature .icon {
  width: 46px; height: 46px; border-radius: 12px; display: flex;
  align-items: center; justify-content: center; margin-bottom: 16px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff; font-size: 22px; font-weight: 800;
}
.feature h3 { font-size: 17.5px; margin-bottom: 8px; color: var(--navy); }
.section.dark .feature h3 { color: #fff; }
.feature p { font-size: 14.5px; color: var(--muted); }
.section.dark .feature p { color: #b9cfe2; }

/* ---------- Tables ---------- */
.spec-table {
  width: 100%; border-collapse: collapse; background: #fff;
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm);
  border: 1px solid var(--line);
}
.spec-table th, .spec-table td {
  padding: 14px 18px; text-align: left; font-size: 15px;
  border-bottom: 1px solid var(--line);
}
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table th {
  width: 38%; color: var(--navy); font-weight: 700; background: var(--bg-soft);
}
.spec-table.head-row thead th {
  width: auto; background: var(--navy); color: #fff; font-weight: 700;
}
.spec-table.head-row tbody th { background: #fff; font-weight: 600; }
.spec-table tbody tr:nth-child(even) td { background: #fafdff; }
.table-scroll { overflow-x: auto; }

/* comparison table accent */
.spec-table td.good { color: #0c7a43; font-weight: 700; }
.spec-table td.bad { color: #b3452e; }

/* ---------- Chip list ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  background: #fff; border: 1px solid var(--line); color: var(--ink);
  padding: 9px 16px; border-radius: 999px; font-size: 14px; font-weight: 600;
  box-shadow: 0 2px 6px rgba(10,46,79,0.05);
}
.section.soft .chip { background: #fff; }
.chip.dark { background: var(--navy); color: #dceafa; border-color: var(--navy); }

/* ---------- Video ---------- */
.video-wrap {
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  background: #000;
}
.video-wrap video { width: 100%; display: block; }

/* ---------- Global network ---------- */
.map-band img { border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.offices { margin-top: 34px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.office {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; font-size: 14px; color: var(--muted);
  box-shadow: var(--shadow-sm);
}
.office strong { display: block; color: var(--navy); font-size: 15.5px; margin-bottom: 6px; }

/* ---------- CTA band ---------- */
.cta-band {
  background:
    radial-gradient(700px 300px at 15% 0%, rgba(42,184,218,0.30), transparent 60%),
    linear-gradient(120deg, #0d5fa0, #0a2e4f);
  color: #fff; border-radius: 20px;
  padding: 54px 56px; display: flex; align-items: center;
  justify-content: space-between; gap: 32px; box-shadow: var(--shadow);
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); letter-spacing: -0.02em; margin-bottom: 8px; color: #fff; }
.cta-band p { color: #cfe2f2; max-width: 560px; }
.cta-band .btn { flex-shrink: 0; }

/* ---------- Page hero (subpages) ---------- */
.page-hero {
  background:
    radial-gradient(700px 360px at 90% 0%, rgba(42,184,218,0.22), transparent 60%),
    linear-gradient(135deg, #0a2e4f, #0e3d63);
  color: #fff; padding: 64px 0 58px;
}
.page-hero .eyebrow { color: #7fd4ea; }
.page-hero h1 {
  font-size: clamp(30px, 4vw, 44px); letter-spacing: -0.02em;
  margin: 10px 0 12px; line-height: 1.15;
}
.page-hero p { color: #d7e6f3; max-width: 700px; font-size: 17px; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 40px; align-items: start; }
.contact-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 28px; box-shadow: var(--shadow-sm); margin-bottom: 18px;
}
.contact-card h3 {
  font-size: 15px; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--muted); margin-bottom: 8px; font-weight: 800;
}
.contact-card .big { font-size: 19px; font-weight: 700; color: var(--navy); }
.contact-card p { color: var(--muted); font-size: 15px; }

.form-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13.5px; font-weight: 700; color: var(--navy); }
.form-field input, .form-field select, .form-field textarea {
  font: inherit; padding: 12px 14px; border: 1.5px solid var(--line);
  border-radius: 10px; background: #fbfdfe; color: var(--ink);
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(42,184,218,0.18);
}
.form-note { font-size: 13px; color: var(--muted); margin-top: 12px; }

/* ---------- Footer ---------- */
.site-footer { background: #081f35; color: #a9c2d8; font-size: 14.5px; }
.site-footer .foot-main {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 36px;
  padding: 56px 0 40px;
}
.site-footer h4 {
  color: #fff; font-size: 14px; text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 16px;
}
.site-footer ul { list-style: none; }
.site-footer ul li { margin-bottom: 9px; }
.site-footer a { color: #a9c2d8; }
.site-footer a:hover { color: #fff; }
.foot-brand img { height: 40px; margin-bottom: 14px; background: #fff; padding: 5px 10px; border-radius: 8px; }
.foot-brand p { font-size: 13.5px; line-height: 1.6; max-width: 300px; }
.foot-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 18px 0; font-size: 13px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1180px) {
  .main-nav { gap: 16px; }
  .main-nav a { font-size: 14.5px; }
  .brand .brand-text span { display: none; }
}

@media (max-width: 980px) {
  .hero .container { grid-template-columns: 1fr; padding-top: 60px; padding-bottom: 64px; }
  .hero-media { max-width: 520px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .stats .container { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .offices { grid-template-columns: 1fr 1fr; }
  .site-footer .foot-main { grid-template-columns: 1fr 1fr; }
  .cta-band { flex-direction: column; align-items: flex-start; padding: 40px 34px; }
  .topbar .tb-right { display: none; }

  /* hamburger navigation */
  .main-nav {
    position: fixed; inset: 0; top: 0; background: rgba(8, 31, 53, 0.98);
    flex-direction: column; justify-content: center; gap: 8px;
    transform: translateX(100%); visibility: hidden;
    transition: transform 0.3s ease, visibility 0s linear 0.3s; z-index: 200;
  }
  .main-nav.open { transform: none; visibility: visible; transition: transform 0.3s ease; }
  .main-nav a { color: #fff; font-size: 20px; padding: 12px; }
  .main-nav a.active { color: var(--cyan); border-bottom-color: transparent; }
  .main-nav .btn { margin-top: 10px; }
  .main-nav .lang-toggle {
    border-color: #fff; margin-top: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
  }
  .main-nav .lang-toggle a { color: #fff; font-size: 16px; padding: 10px 24px; }
  .main-nav .lang-toggle a.on { background: #fff; color: var(--navy); }
  .main-nav .lang-toggle a:not(.on):hover { background: rgba(255, 255, 255, 0.15); color: #fff; }
  .nav-toggle { display: block; z-index: 300; position: relative; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7.6px) rotate(45deg); background: #fff; }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7.6px) rotate(-45deg); background: #fff; }
}

@media (max-width: 720px) {
  .topbar .tb-right { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .offices { grid-template-columns: 1fr; }
  .site-footer .foot-main { grid-template-columns: 1fr; }
}