:root {
  --blue: #0b43b8;
  --blue-dark: #123d86;
  --red: #ef1d2d;
  --text: #1b1f24;
  --muted: #5d6875;
  --light: #f4f8fd;
  --border: #dce5f0;
  --white: #fff;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
}
body, button, input, textarea, a { font-family: Roboto, Helvetica, Arial, sans-serif; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--red); }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,.98);
  box-shadow: 0 2px 16px rgba(20,40,80,.14);
}
.header-inner {
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.logo img { width: 300px; max-width: 100%; display: block; }
.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--blue);
  font-size: 30px;
  cursor: pointer;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 38px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  position: relative;
  display: block;
  padding: 31px 0 27px;
  color: var(--blue);
  font-size: 17px;
  font-weight: 600;
}
.nav-list a:hover { color: var(--red); }
.nav-list a.active { color: var(--red); }
.nav-list a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 17px;
  height: 3px;
  border-radius: 3px;
  background: var(--red);
}
.hero {
  min-height: calc(100vh - 92px);
  display: flex;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 90px 0 110px;
  background:
    radial-gradient(ellipse at 50% 45%, #fff 0%, #f5f9ff 45%, #e7f2ff 100%);
}
.hero::before, .hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.hero::before {
  width: 75%; height: 45%;
  left: -20%; bottom: -23%;
  border-top: 2px solid rgba(83,145,216,.16);
  box-shadow: 0 -25px 0 rgba(83,145,216,.07), 0 -50px 0 rgba(83,145,216,.05);
  transform: rotate(-7deg);
}
.hero::after {
  width: 70%; height: 45%;
  right: -18%; bottom: -20%;
  border-top: 2px solid rgba(83,145,216,.15);
  box-shadow: 0 -25px 0 rgba(83,145,216,.06), 0 -50px 0 rgba(83,145,216,.045);
  transform: rotate(7deg);
}
.hero-content { position: relative; z-index: 1; }
.hero h1 {
  margin: 0 0 20px;
  color: var(--blue-dark);
  font-size: clamp(54px, 7vw, 92px);
  line-height: 1.05;
  font-weight: 700;
}
.hero h2 {
  margin: 0 auto;
  max-width: 900px;
  font-size: clamp(25px, 2.5vw, 38px);
  line-height: 1.25;
}
.hero p {
  max-width: 820px;
  margin: 25px auto 0;
  font-size: 20px;
  color: #333;
}
.actions { margin-top: 42px; display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 250px;
  min-height: 58px;
  padding: 15px 26px;
  border-radius: 9px;
  border: 2px solid var(--blue);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  transition: .2s ease;
}
.btn-primary { background: var(--blue); color: white; }
.btn-primary:hover { background: #07358e; color: white; }
.btn-outline { background: transparent; color: var(--blue); }
.btn-outline:hover { background: var(--blue); color: white; }
.section { padding: 85px 0; }
.section.alt { background: var(--light); }
.section h2 {
  margin: 0 0 16px;
  text-align: center;
  color: var(--blue-dark);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.2;
}
.section-intro {
  max-width: 800px;
  margin: 0 auto 48px;
  text-align: center;
  color: var(--muted);
  font-size: 18px;
}
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 30px;
  box-shadow: 0 6px 22px rgba(25,55,90,.06);
}
.card h3 { margin: 0 0 10px; color: var(--blue-dark); font-size: 23px; }
.card p { margin: 0; color: var(--muted); }
.mission {
  max-width: 850px;
  margin: 35px auto 0;
  padding: 28px;
  text-align: center;
  border-left: 5px solid var(--red);
  background: white;
  box-shadow: 0 6px 22px rgba(25,55,90,.06);
}
.mission strong { display:block; font-size: 25px; color: var(--blue-dark); }
.workflow { counter-reset: step; }
.workflow .card { position: relative; padding-top: 42px; }
.workflow .card::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: 15px; right: 20px;
  color: var(--red);
  font-size: 14px; font-weight: 800;
}
.download-box {
  max-width: 850px;
  margin: 0 auto;
  text-align: center;
  padding: 45px;
  border-radius: 18px;
  background: white;
  border: 1px solid var(--border);
  box-shadow: 0 10px 35px rgba(25,55,90,.08);
}
.download-box .btn { margin: 18px 8px 0; }
.meta { color: var(--muted); }
.checksum {
  margin-top: 20px;
  padding: 14px;
  border-radius: 8px;
  background: #f1f4f8;
  font: 13px/1.5 Consolas, monospace;
  word-break: break-all;
  text-align: left;
}
.faq-group { margin: 45px 0 0; }
.faq-group h3 { color: var(--blue-dark); font-size: 27px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: 9px;
  margin: 10px 0;
  background: white;
  overflow: hidden;
}
.faq-question {
  width: 100%;
  border: 0;
  background: white;
  padding: 20px 22px;
  text-align: left;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  position: relative;
  padding-right: 55px;
}
.faq-question::after { content: "+"; position:absolute; right:22px; font-size:24px; color:var(--blue); top:14px; }
.faq-item.open .faq-question::after { content: "−"; }
.faq-answer { display: none; padding: 0 22px 20px; color: var(--muted); }
.faq-item.open .faq-answer { display: block; }
.contact-grid { align-items: stretch; }
.contact-method { text-align:center; }
.contact-method .icon { font-size: 38px; color: var(--blue); margin-bottom: 10px; }
.contact-method h3 { margin-bottom: 6px; }
.no-call {
  margin: 28px auto;
  max-width: 750px;
  padding: 18px 24px;
  text-align:center;
  border-radius: 10px;
  background: #fff2f3;
  color: #9e1720;
  font-weight: 700;
}
.address { text-align:center; font-size:18px; }
.site-footer { background: #123d86; color: white; padding: 30px 0; }
.footer-inner { display:flex; justify-content:space-between; gap:25px; align-items:center; }
.site-footer p { margin:0; font-size:14px; }
.page-hero { background: var(--light); padding: 65px 0; text-align:center; }
.page-hero h1 { margin:0; color:var(--blue-dark); font-size:clamp(40px,5vw,62px); }
.page-hero p { margin:12px auto 0; max-width:750px; color:var(--muted); font-size:18px; }
.back-top { position:fixed; right:22px; bottom:22px; width:45px; height:45px; border-radius:50%; background:var(--blue); color:#fff; display:none; align-items:center; justify-content:center; z-index:900; }
.back-top.show { display:flex; }
@media (max-width: 900px) {
  .header-inner { min-height:78px; }
  .logo img { width:240px; }
  .nav-toggle { display:block; }
  .nav { display:none; width:100%; }
  .nav.open { display:block; }
  .header-inner { flex-wrap:wrap; }
  .nav-list { flex-direction:column; align-items:stretch; gap:0; padding-bottom:12px; }
  .nav-list a { padding:11px 0; }
  .nav-list a.active::after { display:none; }
  .grid-2, .grid-3 { grid-template-columns:1fr; }
  .hero { min-height:auto; padding:75px 0 90px; }
  .footer-inner { flex-direction:column; text-align:center; }
}
@media (max-width: 560px) {
  .container { width:min(var(--max), calc(100% - 28px)); }
  .logo img { width:195px; }
  .hero h1 { font-size:52px; }
  .hero p { font-size:17px; }
  .btn { width:100%; min-width:0; }
  .download-box { padding:30px 20px; }
}





/* FAQ reference design */
.ref-faq-page { background: #fff; }
.ref-faq-container {
  width: min(1365px, calc(100% - 80px));
  margin: 0 auto;
}
.ref-faq-hero {
  padding: 38px 0 34px;
  background:
    radial-gradient(ellipse at 88% 35%, rgba(211,231,250,.72) 0%, rgba(236,245,253,.52) 28%, rgba(255,255,255,0) 58%),
    linear-gradient(180deg, #eef7ff 0%, #f8fbfe 72%, #fff 100%);
  position: relative;
  overflow: hidden;
}
.ref-faq-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: 0;
  width: 55%;
  height: 100%;
  background: repeating-radial-gradient(
    ellipse at 75% 70%, transparent 0 20px, rgba(171,204,235,.18) 21px 22px
  );
  opacity: .65;
  pointer-events: none;
}
.ref-faq-hero .ref-faq-container { position: relative; z-index: 1; }
.ref-faq-hero h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.1;
  color: #102d5f;
}
.ref-faq-hero p {
  margin: 0;
  color: #5b697b;
  font-size: 1.05rem;
}
.ref-faq-content { padding: 30px 0 52px; }

.ref-faq-category {
  margin: 0;
}
.ref-category-toggle {
  width: 100%;
  min-height: 58px;
  border: 0;
  border-bottom: 1px solid #d9e3ee;
  background: transparent;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  font: inherit;
  font-size: 1.25rem;
  font-weight: 700;
  color: #102d5f;
}
.ref-category-toggle:hover { color: #0b4fa8; }
.ref-category-chevron {
  width: 24px;
  text-align: center;
  font-size: 24px;
  line-height: 1;
  color: #102d5f;
}
.ref-category-content {
  display: none;
  padding: 18px 0 20px;
}
.ref-category-content.open { display: block; }

.ref-faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ref-faq-item { margin: 0; }
.ref-faq-question {
  width: 100%;
  min-height: 58px;
  border: 1px solid #cbdceb;
  border-radius: 9px;
  background: #fff;
  padding: 15px 48px 15px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  text-align: left;
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  color: #124681;
  cursor: pointer;
  box-sizing: border-box;
  box-shadow: 0 2px 7px rgba(21,61,103,.035);
}
.ref-faq-question:hover { border-color: #aac8e5; }
.ref-faq-question[aria-expanded="true"] {
  color: #e11c22;
  border-radius: 9px 9px 0 0;
  border-bottom-color: #dce6f0;
}
.ref-faq-icon {
  flex: 0 0 auto;
  width: 20px;
  text-align: center;
  font-size: 22px;
  line-height: 1;
  font-weight: 700;
  color: #0751ad;
}
.ref-faq-question[aria-expanded="true"] .ref-faq-icon { color: #e11c22; }
.ref-faq-answer {
  display: none;
  border: 1px solid #cbdceb;
  border-top: 0;
  border-radius: 0 0 9px 9px;
  background: #f8fbfe;
  padding: 5px 20px 18px;
  color: #5b697b;
  font-size: 1rem;
  line-height: 1.55;
}
.ref-faq-answer.open { display: block; }
.ref-faq-answer p { margin: 0; }

@media (max-width: 700px) {
  .ref-faq-container { width: min(100% - 32px, 1365px); }
  .ref-faq-hero { padding: 30px 0 26px; }
  .ref-faq-content { padding-top: 24px; }
  .ref-category-toggle { min-height: 54px; font-size: 1.15rem; }
  .ref-faq-question { padding: 14px 42px 14px 15px; }
}