:root {
  --ba-blue: #125caa;
  --ba-blue-dark: #0b3f74;
  --ba-blue-light: #e5f1fb;
  --ba-white: #ffffff;
  --ba-gray-light: #f5f7fa;
  --ba-gray: #667085;
  --ba-text: #1f2933;
  --ba-radius: 8px;
  --ba-shadow-soft: 0 14px 30px rgba(15, 23, 42, 0.1);
  --ba-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body.ba-body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--ba-font-sans);
  color: var(--ba-text);
  background: radial-gradient(circle at top left, var(--ba-blue-light), var(--ba-white));
}

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

a:hover {
  text-decoration: underline;
}

.ba-header {
  background: linear-gradient(120deg, var(--ba-blue-dark), var(--ba-blue));
  color: var(--ba-white);
  box-shadow: var(--ba-shadow-soft);
  position: sticky;
  top: 0;
  z-index: 10;
}

.ba-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.ba-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
}

.ba-brand:hover {
  text-decoration: none;
}

.ba-logo {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, var(--ba-white), var(--ba-blue));
  object-fit: cover;
}

.ba-brand-text {
  display: flex;
  flex-direction: column;
}

.ba-brand-title {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.ba-brand-subtitle {
  font-size: 0.8rem;
  opacity: 0.9;
}

.ba-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.ba-nav a {
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  color: var(--ba-white);
  opacity: 0.85;
  border: 1px solid transparent;
}

.ba-nav a:hover {
  opacity: 1;
  border-color: rgba(255, 255, 255, 0.3);
  text-decoration: none;
}

.ba-nav a.active {
  background: var(--ba-white);
  color: var(--ba-blue-dark);
  opacity: 1;
}

.ba-main {
  flex: 1;
  padding: 2rem 1.5rem 3rem;
}

.ba-article {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem clamp(1.5rem, 3vw, 2.5rem);
  background: rgba(255, 255, 255, 0.96);
  border-radius: 18px;
  box-shadow: var(--ba-shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.ba-page-title {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.9rem;
}

.ba-article > p:first-of-type {
  font-size: 1.02rem;
  line-height: 1.7;
}

h2,
h3 {
  color: var(--ba-blue-dark);
  margin-top: 1.8rem;
}

ul,
ol {
  padding-left: 1.25rem;
}

blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--ba-blue-light);
  border-left: 4px solid var(--ba-blue);
  border-radius: var(--ba-radius);
  color: var(--ba-blue-dark);
}

.ba-footer {
  padding: 1.5rem 1.5rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--ba-gray);
}

.ba-footer p {
  margin: 0;
}

.ba-form {
  margin-top: 1rem;
  display: grid;
  gap: 0.9rem;
}

.ba-form-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.ba-form-row label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ba-blue-dark);
}

.ba-form-row input,
.ba-form-row textarea {
  padding: 0.6rem 0.7rem;
  border-radius: 0.6rem;
  border: 1px solid #cbd5e1;
  font: inherit;
  resize: vertical;
}

.ba-form-row input:focus,
.ba-form-row textarea:focus {
  outline: none;
  border-color: var(--ba-blue);
  box-shadow: 0 0 0 1px var(--ba-blue-light);
}

.ba-button {
  align-self: flex-start;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  border: none;
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  background: linear-gradient(120deg, var(--ba-blue-dark), var(--ba-blue));
  color: var(--ba-white);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.2);
}

.ba-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.25);
}

.ba-button:active {
  transform: translateY(0);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.18);
}

@media (max-width: 720px) {
  .ba-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .ba-article {
    padding: 1.4rem 1.2rem;
  }

  .ba-page-title {
    font-size: 1.6rem;
  }
}