:root {
  --ink: #0b1724;
  --ink-soft: #243447;
  --muted: #6b7c90;
  --paper: #f4f8fc;
  --ice: #dff0ff;
  --line: rgba(36, 74, 112, 0.14);
  --brand: #1f7ab8;
  --brand-deep: #0f4f7a;
  --glow: rgba(88, 186, 255, 0.35);
  --font-display: "Instrument Serif", "Songti SC", serif;
  --font-body: "Manrope", "PingFang SC", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(120, 196, 255, 0.28), transparent 60%),
    radial-gradient(900px 500px at 10% 10%, rgba(210, 232, 255, 0.55), transparent 55%),
    linear-gradient(180deg, #eef5fb 0%, #f7fbff 42%, #ffffff 100%);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.sky, .snow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.snow {
  background-image:
    radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,.85), transparent),
    radial-gradient(1.5px 1.5px at 70% 20%, rgba(255,255,255,.7), transparent),
    radial-gradient(1.5px 1.5px at 40% 70%, rgba(255,255,255,.55), transparent),
    radial-gradient(2px 2px at 85% 60%, rgba(255,255,255,.65), transparent);
  animation: drift 18s linear infinite;
  opacity: .55;
}
@keyframes drift {
  from { transform: translateY(0); }
  to { transform: translateY(40px); }
}

.top, main, .site-footer { position: relative; z-index: 1; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px clamp(20px, 4vw, 56px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}
.top nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
}
.top nav a:hover { color: var(--brand-deep); }

.hero {
  min-height: calc(100vh - 88px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: end;
  gap: 32px;
  padding: 24px clamp(20px, 4vw, 56px) 72px;
}
.hero-copy { max-width: 640px; padding-bottom: 48px; }
.brand-mark {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(42px, 7vw, 72px);
  line-height: 0.95;
  letter-spacing: 0.04em;
  color: var(--brand-deep);
}
.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 400;
  line-height: 1.15;
  color: var(--ink);
}
.hero-lead {
  margin: 22px 0 0;
  max-width: 34em;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform .2s ease, background .2s ease, opacity .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
}
.btn.ghost {
  background: rgba(255,255,255,.55);
  border-color: var(--line);
  color: var(--ink-soft);
  backdrop-filter: blur(8px);
}
.btn.disabled,
.btn[aria-disabled="true"] {
  opacity: .45;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
}

.hero-visual {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  border-radius: 28px 28px 0 0;
  background:
    linear-gradient(180deg, rgba(184, 220, 255, 0.35), rgba(255,255,255,0) 40%),
    linear-gradient(160deg, #9fc7e8 0%, #d7ebfa 45%, #f5faff 100%);
}
.glow {
  position: absolute;
  width: 280px;
  height: 280px;
  right: 12%;
  top: 8%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow), transparent 70%);
  animation: pulse 6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: .8; }
  50% { transform: scale(1.08); opacity: 1; }
}
.ridge {
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 0;
  height: 58%;
  clip-path: polygon(0 100%, 0 55%, 18% 42%, 34% 58%, 52% 28%, 68% 52%, 82% 36%, 100% 48%, 100% 100%);
  background: linear-gradient(180deg, #5f8fb8 0%, #2f5678 100%);
  opacity: .9;
}
.ridge-b {
  height: 48%;
  opacity: .72;
  clip-path: polygon(0 100%, 0 62%, 22% 48%, 40% 64%, 58% 40%, 74% 60%, 90% 46%, 100% 58%, 100% 100%);
  background: linear-gradient(180deg, #7aa8cc 0%, #3d678b 100%);
  animation: rise 7s ease-in-out infinite alternate;
}
.ridge-c {
  height: 38%;
  opacity: .55;
  clip-path: polygon(0 100%, 0 70%, 25% 58%, 45% 72%, 65% 54%, 85% 68%, 100% 60%, 100% 100%);
  background: linear-gradient(180deg, #a8cbe4 0%, #5d84a5 100%);
  animation: rise 9s ease-in-out infinite alternate-reverse;
}
@keyframes rise {
  from { transform: translateY(8px); }
  to { transform: translateY(0); }
}

.section {
  padding: 72px clamp(20px, 4vw, 56px);
}
.section-head {
  max-width: 640px;
  margin-bottom: 28px;
}
.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 400;
}
.section-head p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.service-grid article {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255,255,255,.66);
  backdrop-filter: blur(8px);
}
.service-grid h3 {
  margin: 0 0 10px;
  font-size: 18px;
}
.service-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.download-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 24px;
  padding: 28px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(255,255,255,.8), rgba(223,240,255,.7));
}
.download-icon { border-radius: 18px; }
.download-title { margin: 0; font-size: 20px; font-weight: 800; }
.download-meta { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

.legal-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.legal-links a {
  display: block;
  padding: 18px 20px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.7);
  font-weight: 700;
}
.legal-links a:hover {
  border-color: rgba(31, 122, 184, 0.35);
  color: var(--brand-deep);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
}
.contact-grid div {
  padding: 18px 20px;
  border-radius: 16px;
  background: rgba(255,255,255,.66);
  border: 1px solid var(--line);
}
.contact-grid dt {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}
.contact-grid dd {
  margin: 0;
  line-height: 1.55;
  font-weight: 600;
}

.site-footer {
  padding: 36px clamp(20px, 4vw, 56px) 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  display: grid;
  gap: 8px;
}
.site-footer a:hover { color: var(--brand-deep); }

.legal-page {
  background: #f7fbff;
}
.legal-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}
.legal-wrap h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 400;
  margin: 12px 0 24px;
}
.legal-body p {
  margin: 0 0 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-visual { min-height: 280px; order: -1; border-radius: 24px; }
  .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .top nav { display: none; }
  .service-grid,
  .legal-links,
  .contact-grid { grid-template-columns: 1fr; }
  .download-panel { align-items: flex-start; }
}