:root {
  --ink: #132033;
  --muted: #f4f7fa;
  --primary: #0F766E;
  --border: #d9e2ec;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, sans-serif; color: var(--ink); background: #fff; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.center { text-align: center; }
.small { opacity: 0.8; font-size: 14px; }

.site-header {
  position: sticky;
  top: 0;
  background: white;
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 88px;
}

.brand {
  flex: 0 0 auto;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 96px;
  width: auto;
  display: block;
}

.nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.nav a {
  margin-left: 18px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
}

.hero { background: var(--muted); padding: 90px 0; }
.hero-inner { text-align: center; }
h1 { font-size: 38px; line-height: 1.15; margin: 0 0 16px; }
.subhead { font-size: 18px; opacity: 0.85; max-width: 760px; margin: 0 auto 26px; }
.section { padding: 70px 0; }
.section.muted { background: var(--muted); }

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
}

.btn-primary { background: var(--primary); color: white; border: 2px solid var(--primary); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }

.bullets { padding-left: 18px; }
.bullets li { margin-bottom: 10px; }

.model-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 20px; }
@media (max-width: 980px) { .model-steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .model-steps { grid-template-columns: 1fr; } }

.card { background: white; border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { margin: 0; opacity: 0.85; }

.form { max-width: 720px; }
.form input, .form textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 8px;
  font-size: 15px;
}

.form label { display: block; margin-bottom: 14px; font-weight: 600; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

.hp { display: none; }
.site-footer { padding: 42px 0; border-top: 1px solid var(--border); }
.tagline { font-weight: 800; margin-bottom: 8px; }

@media (max-width: 640px) {
  .header-inner {
    gap: 12px;
    height: 72px;
  }

  .logo img {
    height: 64px;
  }

  .nav a {
    margin-left: 12px;
    font-size: 14px;
  }

  .btn {
    padding: 8px 12px;
    font-size: 13px;
  }
}
.alert {
  padding: 14px 16px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-weight: 600;
}

.alert.success {
  background: #e6f4f1;
  color: #0F766E;
  border: 1px solid #bfe3dc;
}

.alert.error {
  background: #fdecea;
  color: #b42318;
  border: 1px solid #f5c2c0;
}