:root {
  --bg: #f4fbff;
  --bg-soft: #eaf5ff;
  --surface: rgba(255, 255, 255, 0.74);
  --surface-strong: #ffffff;
  --ink: #0b2230;
  --muted: #4a6473;
  --line: rgba(20, 88, 120, 0.16);
  --primary: #0ea5b7;
  --primary-2: #0369a1;
  --primary-ink: #ffffff;
  --radius: 18px;
  --shadow: 0 16px 44px rgba(15, 73, 98, 0.12);
  --max: 1160px;
  --font-head: "Space Grotesk", sans-serif;
  --font-body: "Manrope", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at 12% 20%, rgba(14, 165, 183, 0.22), transparent 32%),
    radial-gradient(circle at 88% 8%, rgba(3, 105, 161, 0.2), transparent 34%),
    linear-gradient(180deg, var(--bg) 0%, #f8fdff 45%, #eff8fd 100%);
  min-height: 100vh;
}
a { color: #075985; }
a:hover { color: #0b6ca8; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  background: rgba(244, 251, 255, 0.82);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  text-decoration: none;
  font: 800 1.18rem var(--font-head);
  color: #093348;
  letter-spacing: 0.02em;
}
.links { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.links a { text-decoration: none; color: #22526a; font-weight: 600; font-size: 0.95rem; }
.links a:hover { color: #0c6b98; }

.btn {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
}
.btn-primary {
  color: var(--primary-ink);
  background: linear-gradient(120deg, var(--primary), var(--primary-2));
  box-shadow: 0 10px 24px rgba(4, 108, 151, 0.3);
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost {
  border-color: rgba(5, 105, 150, 0.25);
  color: #0d5f87;
  background: rgba(255, 255, 255, 0.6);
}

.hero {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
  padding: 54px 20px 26px;
}
.hero h1 {
  margin: 8px 0 14px;
  font: 800 clamp(2rem, 5vw, 3.6rem)/1.06 var(--font-head);
  color: #0a2a3d;
}
.hero p { margin: 0 0 12px; color: var(--muted); font-size: 1.06rem; }
.tag {
  display: inline-block;
  border: 1px solid rgba(7, 102, 139, 0.22);
  color: #0d5d82;
  font-size: 0.83rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 6px 11px;
  background: rgba(255, 255, 255, 0.65);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-canvas {
  min-height: 350px;
  overflow: hidden;
  position: relative;
}
.mail-scene {
  width: 100%;
  height: 100%;
  min-height: 350px;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(34, 197, 94, 0.16), transparent 36%),
    radial-gradient(circle at 75% 22%, rgba(14, 165, 183, 0.2), transparent 40%),
    linear-gradient(180deg, rgba(236, 253, 245, 0.7), rgba(239, 248, 253, 0.5));
}
.mail-card {
  width: min(360px, 85%);
  height: 230px;
  position: relative;
  animation: cardFloat 4.6s ease-in-out infinite;
}
.mail-body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 30px;
  height: 136px;
  background: #ffffff;
  border: 1px solid rgba(28, 80, 118, 0.16);
  border-radius: 16px;
  box-shadow: 0 20px 30px rgba(16, 85, 122, 0.14);
}
.mail-flap {
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
  bottom: 96px;
  width: 100%;
  height: 98px;
  background: linear-gradient(145deg, #0ea5b7, #0f766e);
  clip-path: polygon(0 100%, 50% 12%, 100% 100%);
  transform-origin: 50% 88%;
  animation: flapOpen 3.8s ease-in-out infinite;
  border-radius: 10px;
}
.mail-letter {
  position: absolute;
  left: 11%;
  right: 11%;
  bottom: 54px;
  height: 96px;
  background: linear-gradient(180deg, #ffffff, #ecfeff);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 10px;
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 0 16px;
  animation: letterRise 3.8s ease-in-out infinite;
}
.mail-letter span {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(8, 145, 178, 0.24);
}
.mail-letter span:nth-child(1) { width: 78%; }
.mail-letter span:nth-child(2) { width: 66%; }
.mail-letter span:nth-child(3) { width: 44%; }
.mail-badge {
  position: absolute;
  right: -8px;
  top: 20px;
  background: linear-gradient(140deg, #22c55e, #16a34a);
  color: #fff;
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  border-radius: 999px;
  padding: 8px 14px;
  box-shadow: 0 10px 20px rgba(22, 163, 74, 0.34);
  animation: badgePulse 1.9s ease-in-out infinite;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px;
}
.section h2 {
  margin: 0 0 14px;
  font: 760 clamp(1.45rem, 3.1vw, 2rem) var(--font-head);
  color: #0f3550;
}
.grid-3, .grid-2 { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pane { padding: 20px; }
.pane h3 { margin: 0 0 8px; font: 700 1.14rem var(--font-head); color: #0d3852; }
.pane p { margin: 0 0 9px; color: var(--muted); line-height: 1.58; }

.kpi {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.kpi span {
  display: inline-flex;
  border: 1px solid rgba(7, 102, 139, 0.22);
  border-radius: 999px;
  padding: 6px 11px;
  font-size: 0.86rem;
  color: #0e628b;
  background: rgba(255, 255, 255, 0.7);
}

.timeline .step {
  border-left: 3px solid #47b8d6;
  opacity: 0;
  transform: translateY(14px);
}
.timeline .step.show {
  opacity: 1;
  transform: translateY(0);
  transition: all .58s ease;
}

.page-title {
  max-width: var(--max);
  margin: 0 auto;
  padding: 34px 20px 4px;
}
.page-title h1 {
  margin: 0 0 8px;
  font: 800 clamp(1.9rem, 4.6vw, 3.1rem) var(--font-head);
  color: #0d2f46;
}
.copy { max-width: 880px; color: var(--muted); font-size: 1.02rem; }

.footer {
  max-width: var(--max);
  margin: 10px auto 0;
  border-top: 1px solid var(--line);
  color: #547081;
  padding: 22px 20px 32px;
  font-size: 0.95rem;
}

.floaty { animation: floaty 6.5s ease-in-out infinite; }
.glow { animation: glowPulse 4s ease-in-out infinite; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes glowPulse {
  0%,100% { box-shadow: var(--shadow); }
  50% { box-shadow: 0 18px 48px rgba(14, 123, 162, 0.2); }
}
@keyframes flapOpen {
  0%, 100% { transform: rotateX(0deg); }
  20%, 70% { transform: rotateX(62deg); }
}
@keyframes letterRise {
  0%, 100% { transform: translateY(0); }
  20%, 70% { transform: translateY(34px); }
}
@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}
@keyframes cardFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
}

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; padding-top: 30px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}