/* ========== Trang Giới thiệu ========== */
.page-about {
  background: linear-gradient(180deg, #1a2d42 0%, #2d4a6f 25%, #1e3d2a 60%, #0f2618 100%);
  min-height: 100vh;
}

.about-app {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

/* Nền */
.about-bg {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 40%, rgba(251, 191, 36, 0.12) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(34, 197, 94, 0.08) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.about-year {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 6rem;
  font-weight: 800;
  color: rgba(251, 191, 36, 0.12);
  letter-spacing: 0.06em;
  user-select: none;
}

/* Thanh tiêu đề */
.about-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: rgba(30, 58, 95, 0.95);
  backdrop-filter: blur(8px);
}

.about-back {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-decoration: none;
  font-size: 1.2rem;
}

.about-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
}

.about-header-placeholder {
  width: 40px;
}

/* Nội dung */
.about-content {
  position: relative;
  z-index: 1;
  padding: 16px 20px 28px;
  max-height: calc(100vh - 60px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.about-card {
  background: rgba(255, 255, 255, 0.96);
  border-radius: 14px;
  padding: 20px 18px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

.about-card p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: #374151;
  margin: 0 0 14px 0;
}

.about-card p:last-child {
  margin-bottom: 0;
}

.about-lead {
  font-size: 1rem;
  font-weight: 700;
  color: #1e40af;
  margin-bottom: 16px !important;
}

.about-card strong {
  color: #1f2937;
  font-weight: 700;
}