/* ========== HEADER LMS – Modern Glassmorphism (Telkom University) ========== */
.section-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  border-bottom: 1px solid rgba(61, 61, 61, 0.06);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 24px rgba(0, 0, 0, 0.02);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

.section-header-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0.7rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.header-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #1a1a2e;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  transition: color 0.2s ease, opacity 0.2s ease;
  line-height: 1.3;
}

.header-brand:hover {
  color: #ed1e28;
  opacity: 0.95;
}

.header-logo {
  height: 34px;
  width: auto;
  display: block;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.header-tagline {
  font-size: 0.8rem;
  color: #71717a;
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.01em;
}

.header-back {
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(145deg, #ed1e28, #c91a23);
  text-decoration: none;
  padding: 0.5rem 1.15rem;
  border-radius: 10px;
  transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 2px 8px rgba(237, 30, 40, 0.2), 0 1px 2px rgba(237, 30, 40, 0.1);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

.header-back:hover {
  background: linear-gradient(145deg, #c91a23, #a8161e);
  box-shadow: 0 4px 16px rgba(237, 30, 40, 0.3), 0 2px 4px rgba(237, 30, 40, 0.15);
  transform: translateY(-1px);
}

.header-back:active {
  transform: translateY(0);
}

@media (max-width: 640px) {
  .section-header-inner {
    padding: 0.65rem 1.25rem;
  }

  .header-brand {
    font-size: 0.92rem;
    gap: 0.55rem;
  }

  .header-logo {
    height: 30px;
  }

  .header-back {
    font-size: 0.78rem;
    padding: 0.45rem 0.9rem;
  }
}

@media (max-width: 400px) {
  .section-header-inner {
    padding: 0.6rem 1rem;
  }
}